utvideoenc: Add missing AV_ prefix to codec ID
[ffmpeg.git] / libavcodec / ac3enc.c
index 78e97b5..5102e30 100644 (file)
@@ -26,7 +26,6 @@
  * The simplest AC-3 encoder.
  */
 
-//#define DEBUG
 //#define ASSERT_LEVEL 2
 
 #include <stdint.h>
 #include "ac3.h"
 #include "audioconvert.h"
 #include "fft.h"
-
-
-#ifndef CONFIG_AC3ENC_FLOAT
-#define CONFIG_AC3ENC_FLOAT 0
-#endif
-
-
-/** Maximum number of exponent groups. +1 for separate DC exponent. */
-#define AC3_MAX_EXP_GROUPS 85
-
-#if CONFIG_AC3ENC_FLOAT
-#define MAC_COEF(d,a,b) ((d)+=(a)*(b))
-typedef float SampleType;
-typedef float CoefType;
-typedef float CoefSumType;
-#else
-#define MAC_COEF(d,a,b) MAC64(d,a,b)
-typedef int16_t SampleType;
-typedef int32_t CoefType;
-typedef int64_t CoefSumType;
-#endif
-
-typedef struct AC3MDCTContext {
-    const SampleType *window;           ///< MDCT window function
-    FFTContext fft;                     ///< FFT context for MDCT calculation
-} AC3MDCTContext;
-
-/**
- * Encoding Options used by AVOption.
- */
-typedef struct AC3EncOptions {
-    /* AC-3 metadata options*/
-    int dialogue_level;
-    int bitstream_mode;
-    float center_mix_level;
-    float surround_mix_level;
-    int dolby_surround_mode;
-    int audio_production_info;
-    int mixing_level;
-    int room_type;
-    int copyright;
-    int original;
-    int extended_bsi_1;
-    int preferred_stereo_downmix;
-    float ltrt_center_mix_level;
-    float ltrt_surround_mix_level;
-    float loro_center_mix_level;
-    float loro_surround_mix_level;
-    int extended_bsi_2;
-    int dolby_surround_ex_mode;
-    int dolby_headphone_mode;
-    int ad_converter_type;
-
-    /* other encoding options */
-    int allow_per_frame_metadata;
-    int stereo_rematrixing;
-    int channel_coupling;
-    int cpl_start;
-} AC3EncOptions;
-
-/**
- * Data for a single audio block.
- */
-typedef struct AC3Block {
-    uint8_t  **bap;                             ///< bit allocation pointers (bap)
-    CoefType **mdct_coef;                       ///< MDCT coefficients
-    int32_t  **fixed_coef;                      ///< fixed-point MDCT coefficients
-    uint8_t  **exp;                             ///< original exponents
-    uint8_t  **grouped_exp;                     ///< grouped exponents
-    int16_t  **psd;                             ///< psd per frequency bin
-    int16_t  **band_psd;                        ///< psd per critical band
-    int16_t  **mask;                            ///< masking curve
-    uint16_t **qmant;                           ///< quantized mantissas
-    uint8_t  **cpl_coord_exp;                   ///< coupling coord exponents           (cplcoexp)
-    uint8_t  **cpl_coord_mant;                  ///< coupling coord mantissas           (cplcomant)
-    uint8_t  coeff_shift[AC3_MAX_CHANNELS];     ///< fixed-point coefficient shift values
-    uint8_t  new_rematrixing_strategy;          ///< send new rematrixing flags in this block
-    int      num_rematrixing_bands;             ///< number of rematrixing bands
-    uint8_t  rematrixing_flags[4];              ///< rematrixing flags
-    struct AC3Block *exp_ref_block[AC3_MAX_CHANNELS]; ///< reference blocks for EXP_REUSE
-    int      new_cpl_strategy;                  ///< send new coupling strategy
-    int      cpl_in_use;                        ///< coupling in use for this block     (cplinu)
-    uint8_t  channel_in_cpl[AC3_MAX_CHANNELS];  ///< channel in coupling                (chincpl)
-    int      num_cpl_channels;                  ///< number of channels in coupling
-    uint8_t  new_cpl_coords;                    ///< send new coupling coordinates      (cplcoe)
-    uint8_t  cpl_master_exp[AC3_MAX_CHANNELS];  ///< coupling coord master exponents    (mstrcplco)
-    int      new_snr_offsets;                   ///< send new SNR offsets
-    int      new_cpl_leak;                      ///< send new coupling leak info
-    int      end_freq[AC3_MAX_CHANNELS];        ///< end frequency bin                  (endmant)
-} AC3Block;
-
-/**
- * AC-3 encoder private context.
- */
-typedef struct AC3EncodeContext {
-    AVClass *av_class;                      ///< AVClass used for AVOption
-    AC3EncOptions options;                  ///< encoding options
-    PutBitContext pb;                       ///< bitstream writer context
-    DSPContext dsp;
-    AC3DSPContext ac3dsp;                   ///< AC-3 optimized functions
-    AC3MDCTContext mdct;                    ///< MDCT context
-
-    AC3Block blocks[AC3_MAX_BLOCKS];        ///< per-block info
-
-    int bitstream_id;                       ///< bitstream id                           (bsid)
-    int bitstream_mode;                     ///< bitstream mode                         (bsmod)
-
-    int bit_rate;                           ///< target bit rate, in bits-per-second
-    int sample_rate;                        ///< sampling frequency, in Hz
-
-    int frame_size_min;                     ///< minimum frame size in case rounding is necessary
-    int frame_size;                         ///< current frame size in bytes
-    int frame_size_code;                    ///< frame size code                        (frmsizecod)
-    uint16_t crc_inv[2];
-    int bits_written;                       ///< bit count    (used to avg. bitrate)
-    int samples_written;                    ///< sample count (used to avg. bitrate)
-
-    int fbw_channels;                       ///< number of full-bandwidth channels      (nfchans)
-    int channels;                           ///< total number of channels               (nchans)
-    int lfe_on;                             ///< indicates if there is an LFE channel   (lfeon)
-    int lfe_channel;                        ///< channel index of the LFE channel
-    int has_center;                         ///< indicates if there is a center channel
-    int has_surround;                       ///< indicates if there are one or more surround channels
-    int channel_mode;                       ///< channel mode                           (acmod)
-    const uint8_t *channel_map;             ///< channel map used to reorder channels
-
-    int center_mix_level;                   ///< center mix level code
-    int surround_mix_level;                 ///< surround mix level code
-    int ltrt_center_mix_level;              ///< Lt/Rt center mix level code
-    int ltrt_surround_mix_level;            ///< Lt/Rt surround mix level code
-    int loro_center_mix_level;              ///< Lo/Ro center mix level code
-    int loro_surround_mix_level;            ///< Lo/Ro surround mix level code
-
-    int cutoff;                             ///< user-specified cutoff frequency, in Hz
-    int bandwidth_code;                     ///< bandwidth code (0 to 60)               (chbwcod)
-    int start_freq[AC3_MAX_CHANNELS];       ///< start frequency bin                    (strtmant)
-    int cpl_end_freq;                       ///< coupling channel end frequency bin
-
-    int cpl_on;                             ///< coupling turned on for this frame
-    int cpl_enabled;                        ///< coupling enabled for all frames
-    int num_cpl_subbands;                   ///< number of coupling subbands            (ncplsubnd)
-    int num_cpl_bands;                      ///< number of coupling bands               (ncplbnd)
-    uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS];  ///< number of coeffs in each coupling band
-
-    int rematrixing_enabled;                ///< stereo rematrixing enabled
-
-    /* bitrate allocation control */
-    int slow_gain_code;                     ///< slow gain code                         (sgaincod)
-    int slow_decay_code;                    ///< slow decay code                        (sdcycod)
-    int fast_decay_code;                    ///< fast decay code                        (fdcycod)
-    int db_per_bit_code;                    ///< dB/bit code                            (dbpbcod)
-    int floor_code;                         ///< floor code                             (floorcod)
-    AC3BitAllocParameters bit_alloc;        ///< bit allocation parameters
-    int coarse_snr_offset;                  ///< coarse SNR offsets                     (csnroffst)
-    int fast_gain_code[AC3_MAX_CHANNELS];   ///< fast gain codes (signal-to-mask ratio) (fgaincod)
-    int fine_snr_offset[AC3_MAX_CHANNELS];  ///< fine SNR offsets                       (fsnroffst)
-    int frame_bits_fixed;                   ///< number of non-coefficient bits for fixed parameters
-    int frame_bits;                         ///< all frame bits except exponents and mantissas
-    int exponent_bits;                      ///< number of bits used for exponents
-
-    SampleType **planar_samples;
-    uint8_t *bap_buffer;
-    uint8_t *bap1_buffer;
-    CoefType *mdct_coef_buffer;
-    int32_t *fixed_coef_buffer;
-    uint8_t *exp_buffer;
-    uint8_t *grouped_exp_buffer;
-    int16_t *psd_buffer;
-    int16_t *band_psd_buffer;
-    int16_t *mask_buffer;
-    uint16_t *qmant_buffer;
-    uint8_t *cpl_coord_exp_buffer;
-    uint8_t *cpl_coord_mant_buffer;
-
-    uint8_t exp_strategy[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< exponent strategies
-
-    DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE];
-} AC3EncodeContext;
+#include "ac3enc.h"
+#include "eac3enc.h"
 
 typedef struct AC3Mant {
-    uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
+    int16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
     int mant1_cnt, mant2_cnt, mant4_cnt;    ///< mantissa counts for bap=1,2,4
 } AC3Mant;
 
@@ -244,41 +67,6 @@ static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
 };
 
 
-#define OFFSET(param) offsetof(AC3EncodeContext, options.param)
-#define AC3ENC_PARAM (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
-
-
-#define AC3ENC_TYPE_AC3_FIXED   0
-#define AC3ENC_TYPE_AC3         1
-
-#if CONFIG_AC3ENC_FLOAT
-#define AC3ENC_TYPE AC3ENC_TYPE_AC3
-#include "ac3enc_opts_template.c"
-static AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
-                                ac3_options, LIBAVUTIL_VERSION_INT };
-#else
-#define AC3ENC_TYPE AC3ENC_TYPE_AC3_FIXED
-#include "ac3enc_opts_template.c"
-static AVClass ac3enc_class = { "Fixed-Point AC-3 Encoder", av_default_item_name,
-                                ac3fixed_options, LIBAVUTIL_VERSION_INT };
-#endif
-
-
-/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */
-
-static av_cold void mdct_end(AC3MDCTContext *mdct);
-
-static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
-                             int nbits);
-
-static void apply_window(DSPContext *dsp, SampleType *output, const SampleType *input,
-                         const SampleType *window, unsigned int len);
-
-static int normalize_samples(AC3EncodeContext *s);
-
-static void scale_coefficients(AC3EncodeContext *s);
-
-
 /**
  * LUT for number of exponent groups.
  * exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
@@ -289,7 +77,7 @@ static uint8_t exponent_group_tab[2][3][256];
 /**
  * List of supported channel layouts.
  */
-static const int64_t ac3_channel_layouts[] = {
+const uint64_t ff_ac3_channel_layouts[19] = {
      AV_CH_LAYOUT_MONO,
      AV_CH_LAYOUT_STEREO,
      AV_CH_LAYOUT_2_1,
@@ -387,9 +175,11 @@ static const int8_t ac3_coupling_start_tab[6][3][19] = {
 
 /**
  * Adjust the frame size to make the average bit rate match the target bit rate.
- * This is only needed for 11025, 22050, and 44100 sample rates.
+ * This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
+ *
+ * @param s  AC-3 encoder private context
  */
-static void adjust_frame_size(AC3EncodeContext *s)
+void ff_ac3_adjust_frame_size(AC3EncodeContext *s)
 {
     while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
         s->bits_written    -= s->bit_rate;
@@ -398,72 +188,24 @@ static void adjust_frame_size(AC3EncodeContext *s)
     s->frame_size = s->frame_size_min +
                     2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
     s->bits_written    += s->frame_size * 8;
-    s->samples_written += AC3_FRAME_SIZE;
-}
-
-
-/**
- * Deinterleave input samples.
- * Channels are reordered from Libav's default order to AC-3 order.
- */
-static void deinterleave_input_samples(AC3EncodeContext *s,
-                                       const SampleType *samples)
-{
-    int ch, i;
-
-    /* deinterleave and remap input samples */
-    for (ch = 0; ch < s->channels; ch++) {
-        const SampleType *sptr;
-        int sinc;
-
-        /* copy last 256 samples of previous frame to the start of the current frame */
-        memcpy(&s->planar_samples[ch][0], &s->planar_samples[ch][AC3_FRAME_SIZE],
-               AC3_BLOCK_SIZE * sizeof(s->planar_samples[0][0]));
-
-        /* deinterleave */
-        sinc = s->channels;
-        sptr = samples + s->channel_map[ch];
-        for (i = AC3_BLOCK_SIZE; i < AC3_FRAME_SIZE+AC3_BLOCK_SIZE; i++) {
-            s->planar_samples[ch][i] = *sptr;
-            sptr += sinc;
-        }
-    }
+    s->samples_written += AC3_BLOCK_SIZE * s->num_blocks;
 }
 
 
 /**
- * Apply the MDCT to input samples to generate frequency coefficients.
- * This applies the KBD window and normalizes the input to reduce precision
- * loss due to fixed-point calculations.
+ * Set the initial coupling strategy parameters prior to coupling analysis.
+ *
+ * @param s  AC-3 encoder private context
  */
-static void apply_mdct(AC3EncodeContext *s)
-{
-    int blk, ch;
-
-    for (ch = 0; ch < s->channels; ch++) {
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-            AC3Block *block = &s->blocks[blk];
-            const SampleType *input_samples = &s->planar_samples[ch][blk * AC3_BLOCK_SIZE];
-
-            apply_window(&s->dsp, s->windowed_samples, input_samples, s->mdct.window, AC3_WINDOW_SIZE);
-
-            block->coeff_shift[ch+1] = normalize_samples(s);
-
-            s->mdct.fft.mdct_calcw(&s->mdct.fft, block->mdct_coef[ch+1],
-                                   s->windowed_samples);
-        }
-    }
-}
-
-
-static void compute_coupling_strategy(AC3EncodeContext *s)
+void ff_ac3_compute_coupling_strategy(AC3EncodeContext *s)
 {
     int blk, ch;
     int got_cpl_snr;
+    int num_cpl_blocks;
 
     /* set coupling use flags for each block/channel */
     /* TODO: turn coupling on/off and adjust start band based on bit usage */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
         for (ch = 1; ch <= s->fbw_channels; ch++)
             block->channel_in_cpl[ch] = s->cpl_on;
@@ -472,12 +214,14 @@ static void compute_coupling_strategy(AC3EncodeContext *s)
     /* enable coupling for each block if at least 2 channels have coupling
        enabled for that block */
     got_cpl_snr = 0;
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    num_cpl_blocks = 0;
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
         block->num_cpl_channels = 0;
         for (ch = 1; ch <= s->fbw_channels; ch++)
             block->num_cpl_channels += block->channel_in_cpl[ch];
         block->cpl_in_use = block->num_cpl_channels > 1;
+        num_cpl_blocks += block->cpl_in_use;
         if (!block->cpl_in_use) {
             block->num_cpl_channels = 0;
             for (ch = 1; ch <= s->fbw_channels; ch++)
@@ -503,9 +247,11 @@ static void compute_coupling_strategy(AC3EncodeContext *s)
             block->new_snr_offsets = 0;
         }
     }
+    if (!num_cpl_blocks)
+        s->cpl_on = 0;
 
     /* set bandwidth for each channel */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
         for (ch = 1; ch <= s->fbw_channels; ch++) {
             if (block->channel_in_cpl[ch])
@@ -518,293 +264,11 @@ static void compute_coupling_strategy(AC3EncodeContext *s)
 
 
 /**
- * Calculate a single coupling coordinate.
- */
-static inline float calc_cpl_coord(float energy_ch, float energy_cpl)
-{
-    float coord = 0.125;
-    if (energy_cpl > 0)
-        coord *= sqrtf(energy_ch / energy_cpl);
-    return coord;
-}
-
-
-/**
- * Calculate coupling channel and coupling coordinates.
- * TODO: Currently this is only used for the floating-point encoder. I was
- *       able to make it work for the fixed-point encoder, but quality was
- *       generally lower in most cases than not using coupling. If a more
- *       adaptive coupling strategy were to be implemented it might be useful
- *       at that time to use coupling for the fixed-point encoder as well.
- */
-static void apply_channel_coupling(AC3EncodeContext *s)
-{
-#if CONFIG_AC3ENC_FLOAT
-    DECLARE_ALIGNED(16, float,   cpl_coords)      [AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
-    DECLARE_ALIGNED(16, int32_t, fixed_cpl_coords)[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
-    int blk, ch, bnd, i, j;
-    CoefSumType energy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS][16] = {{{0}}};
-    int num_cpl_coefs = s->num_cpl_subbands * 12;
-
-    /* calculate coupling channel from fbw channels */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-        AC3Block *block = &s->blocks[blk];
-        CoefType *cpl_coef = &block->mdct_coef[CPL_CH][s->start_freq[CPL_CH]];
-        if (!block->cpl_in_use)
-            continue;
-        memset(cpl_coef-1, 0, (num_cpl_coefs+4) * sizeof(*cpl_coef));
-        for (ch = 1; ch <= s->fbw_channels; ch++) {
-            CoefType *ch_coef = &block->mdct_coef[ch][s->start_freq[CPL_CH]];
-            if (!block->channel_in_cpl[ch])
-                continue;
-            for (i = 0; i < num_cpl_coefs; i++)
-                cpl_coef[i] += ch_coef[i];
-        }
-        /* note: coupling start bin % 4 will always be 1 and num_cpl_coefs
-                 will always be a multiple of 12, so we need to subtract 1 from
-                 the start and add 4 to the length when using optimized
-                 functions which require 16-byte alignment. */
-
-        /* coefficients must be clipped to +/- 1.0 in order to be encoded */
-        s->dsp.vector_clipf(cpl_coef-1, cpl_coef-1, -1.0f, 1.0f, num_cpl_coefs+4);
-
-        /* scale coupling coefficients from float to 24-bit fixed-point */
-        s->ac3dsp.float_to_fixed24(&block->fixed_coef[CPL_CH][s->start_freq[CPL_CH]-1],
-                                   cpl_coef-1, num_cpl_coefs+4);
-    }
-
-    /* calculate energy in each band in coupling channel and each fbw channel */
-    /* TODO: possibly use SIMD to speed up energy calculation */
-    bnd = 0;
-    i = s->start_freq[CPL_CH];
-    while (i < s->cpl_end_freq) {
-        int band_size = s->cpl_band_sizes[bnd];
-        for (ch = CPL_CH; ch <= s->fbw_channels; ch++) {
-            for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-                AC3Block *block = &s->blocks[blk];
-                if (!block->cpl_in_use || (ch > CPL_CH && !block->channel_in_cpl[ch]))
-                    continue;
-                for (j = 0; j < band_size; j++) {
-                    CoefType v = block->mdct_coef[ch][i+j];
-                    MAC_COEF(energy[blk][ch][bnd], v, v);
-                }
-            }
-        }
-        i += band_size;
-        bnd++;
-    }
-
-    /* determine which blocks to send new coupling coordinates for */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-        AC3Block *block  = &s->blocks[blk];
-        AC3Block *block0 = blk ? &s->blocks[blk-1] : NULL;
-        int new_coords = 0;
-        CoefSumType coord_diff[AC3_MAX_CHANNELS] = {0,};
-
-        if (block->cpl_in_use) {
-            /* calculate coupling coordinates for all blocks and calculate the
-               average difference between coordinates in successive blocks */
-            for (ch = 1; ch <= s->fbw_channels; ch++) {
-                if (!block->channel_in_cpl[ch])
-                    continue;
-
-                for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
-                    cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy[blk][ch][bnd],
-                                                              energy[blk][CPL_CH][bnd]);
-                    if (blk > 0 && block0->cpl_in_use &&
-                        block0->channel_in_cpl[ch]) {
-                        coord_diff[ch] += fabs(cpl_coords[blk-1][ch][bnd] -
-                                               cpl_coords[blk  ][ch][bnd]);
-                    }
-                }
-                coord_diff[ch] /= s->num_cpl_bands;
-            }
-
-            /* send new coordinates if this is the first block, if previous
-             * block did not use coupling but this block does, the channels
-             * using coupling has changed from the previous block, or the
-             * coordinate difference from the last block for any channel is
-             * greater than a threshold value. */
-            if (blk == 0) {
-                new_coords = 1;
-            } else if (!block0->cpl_in_use) {
-                new_coords = 1;
-            } else {
-                for (ch = 1; ch <= s->fbw_channels; ch++) {
-                    if (block->channel_in_cpl[ch] && !block0->channel_in_cpl[ch]) {
-                        new_coords = 1;
-                        break;
-                    }
-                }
-                if (!new_coords) {
-                    for (ch = 1; ch <= s->fbw_channels; ch++) {
-                        if (block->channel_in_cpl[ch] && coord_diff[ch] > 0.04) {
-                            new_coords = 1;
-                            break;
-                        }
-                    }
-                }
-            }
-        }
-        block->new_cpl_coords = new_coords;
-    }
-
-    /* calculate final coupling coordinates, taking into account reusing of
-       coordinates in successive blocks */
-    for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
-        blk = 0;
-        while (blk < AC3_MAX_BLOCKS) {
-            int blk1;
-            CoefSumType energy_cpl;
-            AC3Block *block  = &s->blocks[blk];
-
-            if (!block->cpl_in_use) {
-                blk++;
-                continue;
-            }
-
-            energy_cpl = energy[blk][CPL_CH][bnd];
-            blk1 = blk+1;
-            while (!s->blocks[blk1].new_cpl_coords && blk1 < AC3_MAX_BLOCKS) {
-                if (s->blocks[blk1].cpl_in_use)
-                    energy_cpl += energy[blk1][CPL_CH][bnd];
-                blk1++;
-            }
-
-            for (ch = 1; ch <= s->fbw_channels; ch++) {
-                CoefType energy_ch;
-                if (!block->channel_in_cpl[ch])
-                    continue;
-                energy_ch = energy[blk][ch][bnd];
-                blk1 = blk+1;
-                while (!s->blocks[blk1].new_cpl_coords && blk1 < AC3_MAX_BLOCKS) {
-                    if (s->blocks[blk1].cpl_in_use)
-                        energy_ch += energy[blk1][ch][bnd];
-                    blk1++;
-                }
-                cpl_coords[blk][ch][bnd] = calc_cpl_coord(energy_ch, energy_cpl);
-            }
-            blk = blk1;
-        }
-    }
-
-    /* calculate exponents/mantissas for coupling coordinates */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-        AC3Block *block = &s->blocks[blk];
-        if (!block->cpl_in_use || !block->new_cpl_coords)
-            continue;
-
-        s->ac3dsp.float_to_fixed24(fixed_cpl_coords[blk][1],
-                                   cpl_coords[blk][1],
-                                   s->fbw_channels * 16);
-        s->ac3dsp.extract_exponents(block->cpl_coord_exp[1],
-                                    fixed_cpl_coords[blk][1],
-                                    s->fbw_channels * 16);
-
-        for (ch = 1; ch <= s->fbw_channels; ch++) {
-            int bnd, min_exp, max_exp, master_exp;
-
-            /* determine master exponent */
-            min_exp = max_exp = block->cpl_coord_exp[ch][0];
-            for (bnd = 1; bnd < s->num_cpl_bands; bnd++) {
-                int exp = block->cpl_coord_exp[ch][bnd];
-                min_exp = FFMIN(exp, min_exp);
-                max_exp = FFMAX(exp, max_exp);
-            }
-            master_exp = ((max_exp - 15) + 2) / 3;
-            master_exp = FFMAX(master_exp, 0);
-            while (min_exp < master_exp * 3)
-                master_exp--;
-            for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
-                block->cpl_coord_exp[ch][bnd] = av_clip(block->cpl_coord_exp[ch][bnd] -
-                                                        master_exp * 3, 0, 15);
-            }
-            block->cpl_master_exp[ch] = master_exp;
-
-            /* quantize mantissas */
-            for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
-                int cpl_exp  = block->cpl_coord_exp[ch][bnd];
-                int cpl_mant = (fixed_cpl_coords[blk][ch][bnd] << (5 + cpl_exp + master_exp * 3)) >> 24;
-                if (cpl_exp == 15)
-                    cpl_mant >>= 1;
-                else
-                    cpl_mant -= 16;
-
-                block->cpl_coord_mant[ch][bnd] = cpl_mant;
-            }
-        }
-    }
-#endif /* CONFIG_AC3ENC_FLOAT */
-}
-
-
-/**
- * Determine rematrixing flags for each block and band.
- */
-static void compute_rematrixing_strategy(AC3EncodeContext *s)
-{
-    int nb_coefs;
-    int blk, bnd, i;
-    AC3Block *block, *block0;
-
-    if (s->channel_mode != AC3_CHMODE_STEREO)
-        return;
-
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-        block = &s->blocks[blk];
-        block->new_rematrixing_strategy = !blk;
-
-        if (!s->rematrixing_enabled) {
-            block0 = block;
-            continue;
-        }
-
-        block->num_rematrixing_bands = 4;
-        if (block->cpl_in_use) {
-            block->num_rematrixing_bands -= (s->start_freq[CPL_CH] <= 61);
-            block->num_rematrixing_bands -= (s->start_freq[CPL_CH] == 37);
-            if (blk && block->num_rematrixing_bands != block0->num_rematrixing_bands)
-                block->new_rematrixing_strategy = 1;
-        }
-        nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
-
-        for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
-            /* calculate calculate sum of squared coeffs for one band in one block */
-            int start = ff_ac3_rematrix_band_tab[bnd];
-            int end   = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
-            CoefSumType sum[4] = {0,};
-            for (i = start; i < end; i++) {
-                CoefType lt = block->mdct_coef[1][i];
-                CoefType rt = block->mdct_coef[2][i];
-                CoefType md = lt + rt;
-                CoefType sd = lt - rt;
-                MAC_COEF(sum[0], lt, lt);
-                MAC_COEF(sum[1], rt, rt);
-                MAC_COEF(sum[2], md, md);
-                MAC_COEF(sum[3], sd, sd);
-            }
-
-            /* compare sums to determine if rematrixing will be used for this band */
-            if (FFMIN(sum[2], sum[3]) < FFMIN(sum[0], sum[1]))
-                block->rematrixing_flags[bnd] = 1;
-            else
-                block->rematrixing_flags[bnd] = 0;
-
-            /* determine if new rematrixing flags will be sent */
-            if (blk &&
-                block->rematrixing_flags[bnd] != block0->rematrixing_flags[bnd]) {
-                block->new_rematrixing_strategy = 1;
-            }
-        }
-        block0 = block;
-    }
-}
-
-
-/**
  * Apply stereo rematrixing to coefficients based on rematrixing flags.
+ *
+ * @param s  AC-3 encoder private context
  */
-static void apply_rematrixing(AC3EncodeContext *s)
+void ff_ac3_apply_rematrixing(AC3EncodeContext *s)
 {
     int nb_coefs;
     int blk, bnd, i;
@@ -814,7 +278,7 @@ static void apply_rematrixing(AC3EncodeContext *s)
     if (!s->rematrixing_enabled)
         return;
 
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
         if (block->new_rematrixing_strategy)
             flags = block->rematrixing_flags;
@@ -835,7 +299,7 @@ static void apply_rematrixing(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Initialize exponent tables.
  */
 static av_cold void exponent_init(AC3EncodeContext *s)
@@ -851,25 +315,22 @@ static av_cold void exponent_init(AC3EncodeContext *s)
     }
     /* LFE */
     exponent_group_tab[0][0][7] = 2;
+
+    if (CONFIG_EAC3_ENCODER && s->eac3)
+        ff_eac3_exponent_init();
 }
 
 
-/**
+/*
  * Extract exponents from the MDCT coefficients.
- * This takes into account the normalization that was done to the input samples
- * by adjusting the exponents by the exponent shift values.
  */
 static void extract_exponents(AC3EncodeContext *s)
 {
-    int blk, ch;
+    int ch        = !s->cpl_on;
+    int chan_size = AC3_MAX_COEFS * s->num_blocks * (s->channels - ch + 1);
+    AC3Block *block = &s->blocks[0];
 
-    for (ch = !s->cpl_on; ch <= s->channels; ch++) {
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-            AC3Block *block = &s->blocks[blk];
-            s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch],
-                                        AC3_MAX_COEFS);
-        }
-    }
+    s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
 }
 
 
@@ -879,8 +340,17 @@ static void extract_exponents(AC3EncodeContext *s)
  */
 #define EXP_DIFF_THRESHOLD 500
 
-
 /**
+ * Table used to select exponent strategy based on exponent reuse block interval.
+ */
+static const uint8_t exp_strategy_reuse_tab[4][6] = {
+    { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
+    { EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
+    { EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15, EXP_D15 },
+    { EXP_D45, EXP_D25, EXP_D25, EXP_D15, EXP_D15, EXP_D15 }
+};
+
+/*
  * Calculate exponent strategies for all channels.
  * Array arrangement is reversed to simplify the per-channel calculation.
  */
@@ -897,9 +367,16 @@ static void compute_exp_strategy(AC3EncodeContext *s)
            reused in the next frame */
         exp_strategy[0] = EXP_NEW;
         exp += AC3_MAX_COEFS;
-        for (blk = 1; blk < AC3_MAX_BLOCKS; blk++, exp += AC3_MAX_COEFS) {
-            if ((ch == CPL_CH && (!s->blocks[blk].cpl_in_use || !s->blocks[blk-1].cpl_in_use)) ||
-                (ch  > CPL_CH && (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]))) {
+        for (blk = 1; blk < s->num_blocks; blk++, exp += AC3_MAX_COEFS) {
+            if (ch == CPL_CH) {
+                if (!s->blocks[blk-1].cpl_in_use) {
+                    exp_strategy[blk] = EXP_NEW;
+                    continue;
+                } else if (!s->blocks[blk].cpl_in_use) {
+                    exp_strategy[blk] = EXP_REUSE;
+                    continue;
+                }
+            } else if (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
                 exp_strategy[blk] = EXP_NEW;
                 continue;
             }
@@ -914,30 +391,34 @@ static void compute_exp_strategy(AC3EncodeContext *s)
         /* now select the encoding strategy type : if exponents are often
            recoded, we use a coarse encoding */
         blk = 0;
-        while (blk < AC3_MAX_BLOCKS) {
+        while (blk < s->num_blocks) {
             blk1 = blk + 1;
-            while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE)
+            while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE)
                 blk1++;
-            switch (blk1 - blk) {
-            case 1:  exp_strategy[blk] = EXP_D45; break;
-            case 2:
-            case 3:  exp_strategy[blk] = EXP_D25; break;
-            default: exp_strategy[blk] = EXP_D15; break;
-            }
+            exp_strategy[blk] = exp_strategy_reuse_tab[s->num_blks_code][blk1-blk-1];
             blk = blk1;
         }
     }
     if (s->lfe_on) {
         ch = s->lfe_channel;
         s->exp_strategy[ch][0] = EXP_D15;
-        for (blk = 1; blk < AC3_MAX_BLOCKS; blk++)
+        for (blk = 1; blk < s->num_blocks; blk++)
             s->exp_strategy[ch][blk] = EXP_REUSE;
     }
+
+    /* for E-AC-3, determine frame exponent strategy */
+    if (CONFIG_EAC3_ENCODER && s->eac3)
+        ff_eac3_get_frame_exp_strategy(s);
 }
 
 
 /**
  * Update the exponents so that they are the ones the decoder will decode.
+ *
+ * @param[in,out] exp   array of exponents for 1 block in 1 channel
+ * @param nb_exps       number of exponents in active bandwidth
+ * @param exp_strategy  exponent strategy for the block
+ * @param cpl           indicates if the block is in the coupling channel
  */
 static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
                                     int cpl)
@@ -1006,7 +487,7 @@ static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
 }
 
 
-/**
+/*
  * Encode exponents from original extracted form to what the decoder will see.
  * This copies and groups exponents based on exponent strategy and reduces
  * deltas between adjacent exponent groups so that they can be differentially
@@ -1024,7 +505,7 @@ static void encode_exponents(AC3EncodeContext *s)
 
         cpl = (ch == CPL_CH);
         blk = 0;
-        while (blk < AC3_MAX_BLOCKS) {
+        while (blk < s->num_blocks) {
             AC3Block *block = &s->blocks[blk];
             if (cpl && !block->cpl_in_use) {
                 exp += AC3_MAX_COEFS;
@@ -1035,10 +516,10 @@ static void encode_exponents(AC3EncodeContext *s)
             blk1 = blk + 1;
 
             /* count the number of EXP_REUSE blocks after the current block
-               and set exponent reference block pointers */
-            block->exp_ref_block[ch] = block;
-            while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE) {
-                s->blocks[blk1].exp_ref_block[ch] = block;
+               and set exponent reference block numbers */
+            s->exp_ref_block[ch][blk] = blk;
+            while (blk1 < s->num_blocks && exp_strategy[blk1] == EXP_REUSE) {
+                s->exp_ref_block[ch][blk1] = blk;
                 blk1++;
             }
             num_reuse_blocks = blk1 - blk - 1;
@@ -1053,6 +534,37 @@ static void encode_exponents(AC3EncodeContext *s)
             blk = blk1;
         }
     }
+
+    /* reference block numbers have been changed, so reset ref_bap_set */
+    s->ref_bap_set = 0;
+}
+
+
+/*
+ * Count exponent bits based on bandwidth, coupling, and exponent strategies.
+ */
+static int count_exponent_bits(AC3EncodeContext *s)
+{
+    int blk, ch;
+    int nb_groups, bit_count;
+
+    bit_count = 0;
+    for (blk = 0; blk < s->num_blocks; blk++) {
+        AC3Block *block = &s->blocks[blk];
+        for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
+            int exp_strategy = s->exp_strategy[ch][blk];
+            int cpl          = (ch == CPL_CH);
+            int nb_coefs     = block->end_freq[ch] - s->start_freq[ch];
+
+            if (exp_strategy == EXP_REUSE)
+                continue;
+
+            nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_coefs];
+            bit_count += 4 + (nb_groups * 7);
+        }
+    }
+
+    return bit_count;
 }
 
 
@@ -1060,17 +572,18 @@ static void encode_exponents(AC3EncodeContext *s)
  * Group exponents.
  * 3 delta-encoded exponents are in each 7-bit group. The number of groups
  * varies depending on exponent strategy and bandwidth.
+ *
+ * @param s  AC-3 encoder private context
  */
-static void group_exponents(AC3EncodeContext *s)
+void ff_ac3_group_exponents(AC3EncodeContext *s)
 {
     int blk, ch, i, cpl;
-    int group_size, nb_groups, bit_count;
+    int group_size, nb_groups;
     uint8_t *p;
     int delta0, delta1, delta2;
     int exp0, exp1;
 
-    bit_count = 0;
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
         for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
             int exp_strategy = s->exp_strategy[ch][blk];
@@ -1079,7 +592,6 @@ static void group_exponents(AC3EncodeContext *s)
             cpl = (ch == CPL_CH);
             group_size = exp_strategy + (exp_strategy == EXP_D45);
             nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
-            bit_count += 4 + (nb_groups * 7);
             p = block->exp[ch] + s->start_freq[ch] - cpl;
 
             /* DC exponent */
@@ -1111,8 +623,6 @@ static void group_exponents(AC3EncodeContext *s)
             }
         }
     }
-
-    s->exponent_bits = bit_count;
 }
 
 
@@ -1120,8 +630,10 @@ static void group_exponents(AC3EncodeContext *s)
  * Calculate final exponents from the supplied MDCT coefficients and exponent shift.
  * Extract exponents from MDCT coefficients, calculate exponent strategies,
  * and encode final exponents.
+ *
+ * @param s  AC-3 encoder private context
  */
-static void process_exponents(AC3EncodeContext *s)
+void ff_ac3_process_exponents(AC3EncodeContext *s)
 {
     extract_exponents(s);
 
@@ -1129,13 +641,11 @@ static void process_exponents(AC3EncodeContext *s)
 
     encode_exponents(s);
 
-    group_exponents(s);
-
     emms_c();
 }
 
 
-/**
+/*
  * Count frame bits that are based solely on fixed parameters.
  * This only has to be run once when the encoder is initialized.
  */
@@ -1151,38 +661,84 @@ static void count_frame_bits_fixed(AC3EncodeContext *s)
      *   no delta bit allocation
      *   no skipped data
      *   no auxilliary data
+     *   no E-AC-3 metadata
      */
 
     /* header */
-    frame_bits = 65;
-    frame_bits += frame_bits_inc[s->channel_mode];
+    frame_bits = 16; /* sync info */
+    if (s->eac3) {
+        /* bitstream info header */
+        frame_bits += 35;
+        frame_bits += 1 + 1;
+        if (s->num_blocks != 0x6)
+            frame_bits++;
+        frame_bits++;
+        /* audio frame header */
+        if (s->num_blocks == 6)
+            frame_bits += 2;
+        frame_bits += 10;
+        /* exponent strategy */
+        if (s->use_frame_exp_strategy)
+            frame_bits += 5 * s->fbw_channels;
+        else
+            frame_bits += s->num_blocks * 2 * s->fbw_channels;
+        if (s->lfe_on)
+            frame_bits += s->num_blocks;
+        /* converter exponent strategy */
+        if (s->num_blks_code != 0x3)
+            frame_bits++;
+        else
+            frame_bits += s->fbw_channels * 5;
+        /* snr offsets */
+        frame_bits += 10;
+        /* block start info */
+        if (s->num_blocks != 1)
+            frame_bits++;
+    } else {
+        frame_bits += 49;
+        frame_bits += frame_bits_inc[s->channel_mode];
+    }
 
     /* audio blocks */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-        /* block switch flags */
-        frame_bits += s->fbw_channels;
+    for (blk = 0; blk < s->num_blocks; blk++) {
+        if (!s->eac3) {
+            /* block switch flags */
+            frame_bits += s->fbw_channels;
 
-        /* dither flags */
-        frame_bits += s->fbw_channels;
+            /* dither flags */
+            frame_bits += s->fbw_channels;
+        }
 
         /* dynamic range */
         frame_bits++;
 
-        /* exponent strategy */
-        frame_bits += 2 * s->fbw_channels;
-        if (s->lfe_on)
+        /* spectral extension */
+        if (s->eac3)
             frame_bits++;
 
-        /* bit allocation params */
-        frame_bits++;
-        if (!blk)
-            frame_bits += 2 + 2 + 2 + 2 + 3;
+        if (!s->eac3) {
+            /* exponent strategy */
+            frame_bits += 2 * s->fbw_channels;
+            if (s->lfe_on)
+                frame_bits++;
 
-        /* delta bit allocation */
-        frame_bits++;
+            /* bit allocation params */
+            frame_bits++;
+            if (!blk)
+                frame_bits += 2 + 2 + 2 + 2 + 3;
+        }
 
-        /* skipped data */
-        frame_bits++;
+        /* converter snr offset */
+        if (s->eac3)
+            frame_bits++;
+
+        if (!s->eac3) {
+            /* delta bit allocation */
+            frame_bits++;
+
+            /* skipped data */
+            frame_bits++;
+        }
     }
 
     /* auxiliary data */
@@ -1195,7 +751,7 @@ static void count_frame_bits_fixed(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Initialize bit allocation.
  * Set default parameter codes and calculate parameter values.
  */
@@ -1207,7 +763,7 @@ static void bit_alloc_init(AC3EncodeContext *s)
     s->slow_decay_code = 2;
     s->fast_decay_code = 1;
     s->slow_gain_code  = 1;
-    s->db_per_bit_code = 3;
+    s->db_per_bit_code = s->eac3 ? 2 : 3;
     s->floor_code      = 7;
     for (ch = 0; ch <= s->channels; ch++)
         s->fast_gain_code[ch] = 4;
@@ -1230,7 +786,7 @@ static void bit_alloc_init(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Count the bits used to encode the frame, minus exponents and mantissas.
  * Bits based on fixed parameters have already been counted, so now we just
  * have to add the bits based on parameters that change during encoding.
@@ -1242,29 +798,83 @@ static void count_frame_bits(AC3EncodeContext *s)
     int frame_bits = 0;
 
     /* header */
-    if (opt->audio_production_info)
-        frame_bits += 7;
-    if (s->bitstream_id == 6) {
-        if (opt->extended_bsi_1)
-            frame_bits += 14;
-        if (opt->extended_bsi_2)
-            frame_bits += 14;
+    if (s->eac3) {
+        if (opt->eac3_mixing_metadata) {
+            if (s->channel_mode > AC3_CHMODE_STEREO)
+                frame_bits += 2;
+            if (s->has_center)
+                frame_bits += 6;
+            if (s->has_surround)
+                frame_bits += 6;
+            frame_bits += s->lfe_on;
+            frame_bits += 1 + 1 + 2;
+            if (s->channel_mode < AC3_CHMODE_STEREO)
+                frame_bits++;
+            frame_bits++;
+        }
+        if (opt->eac3_info_metadata) {
+            frame_bits += 3 + 1 + 1;
+            if (s->channel_mode == AC3_CHMODE_STEREO)
+                frame_bits += 2 + 2;
+            if (s->channel_mode >= AC3_CHMODE_2F2R)
+                frame_bits += 2;
+            frame_bits++;
+            if (opt->audio_production_info)
+                frame_bits += 5 + 2 + 1;
+            frame_bits++;
+        }
+        /* coupling */
+        if (s->channel_mode > AC3_CHMODE_MONO) {
+            frame_bits++;
+            for (blk = 1; blk < s->num_blocks; blk++) {
+                AC3Block *block = &s->blocks[blk];
+                frame_bits++;
+                if (block->new_cpl_strategy)
+                    frame_bits++;
+            }
+        }
+        /* coupling exponent strategy */
+        if (s->cpl_on) {
+            if (s->use_frame_exp_strategy) {
+                frame_bits += 5 * s->cpl_on;
+            } else {
+                for (blk = 0; blk < s->num_blocks; blk++)
+                    frame_bits += 2 * s->blocks[blk].cpl_in_use;
+            }
+        }
+    } else {
+        if (opt->audio_production_info)
+            frame_bits += 7;
+        if (s->bitstream_id == 6) {
+            if (opt->extended_bsi_1)
+                frame_bits += 14;
+            if (opt->extended_bsi_2)
+                frame_bits += 14;
+        }
     }
 
     /* audio blocks */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
 
         /* coupling strategy */
-        frame_bits++;
-        if (block->new_cpl_strategy) {
+        if (!s->eac3)
             frame_bits++;
+        if (block->new_cpl_strategy) {
+            if (!s->eac3)
+                frame_bits++;
             if (block->cpl_in_use) {
-                frame_bits += s->fbw_channels;
+                if (s->eac3)
+                    frame_bits++;
+                if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
+                    frame_bits += s->fbw_channels;
                 if (s->channel_mode == AC3_CHMODE_STEREO)
                     frame_bits++;
                 frame_bits += 4 + 4;
-                frame_bits += s->num_cpl_subbands - 1;
+                if (s->eac3)
+                    frame_bits++;
+                else
+                    frame_bits += s->num_cpl_subbands - 1;
             }
         }
 
@@ -1272,8 +882,9 @@ static void count_frame_bits(AC3EncodeContext *s)
         if (block->cpl_in_use) {
             for (ch = 1; ch <= s->fbw_channels; ch++) {
                 if (block->channel_in_cpl[ch]) {
-                    frame_bits++;
-                    if (block->new_cpl_coords) {
+                    if (!s->eac3 || block->new_cpl_coords[ch] != 2)
+                        frame_bits++;
+                    if (block->new_cpl_coords[ch]) {
                         frame_bits += 2;
                         frame_bits += (4 + 4) * s->num_cpl_bands;
                     }
@@ -1283,7 +894,8 @@ static void count_frame_bits(AC3EncodeContext *s)
 
         /* stereo rematrixing */
         if (s->channel_mode == AC3_CHMODE_STEREO) {
-            frame_bits++;
+            if (!s->eac3 || blk > 0)
+                frame_bits++;
             if (s->blocks[blk].new_rematrixing_strategy)
                 frame_bits += block->num_rematrixing_bands;
         }
@@ -1298,17 +910,20 @@ static void count_frame_bits(AC3EncodeContext *s)
         }
 
         /* coupling exponent strategy */
-        if (block->cpl_in_use)
+        if (!s->eac3 && block->cpl_in_use)
             frame_bits += 2;
 
         /* snr offsets and fast gain codes */
-        frame_bits++;
-        if (block->new_snr_offsets)
-            frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
+        if (!s->eac3) {
+            frame_bits++;
+            if (block->new_snr_offsets)
+                frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
+        }
 
         /* coupling leak info */
         if (block->cpl_in_use) {
-            frame_bits++;
+            if (!s->eac3 || block->new_cpl_leak != 2)
+                frame_bits++;
             if (block->new_cpl_leak)
                 frame_bits += 3 + 3;
         }
@@ -1318,23 +933,7 @@ static void count_frame_bits(AC3EncodeContext *s)
 }
 
 
-/**
- * Finalize the mantissa bit count by adding in the grouped mantissas.
- */
-static int compute_mantissa_size_final(int mant_cnt[5])
-{
-    // bap=1 : 3 mantissas in 5 bits
-    int bits = (mant_cnt[1] / 3) * 5;
-    // bap=2 : 3 mantissas in 7 bits
-    // bap=4 : 2 mantissas in 7 bits
-    bits += ((mant_cnt[2] / 3) + (mant_cnt[4] >> 1)) * 7;
-    // bap=3 : each mantissa is 3 bits
-    bits += mant_cnt[3] * 3;
-    return bits;
-}
-
-
-/**
+/*
  * Calculate masking curve based on the final exponents.
  * Also calculate the power spectral densities to use in future calculations.
  */
@@ -1342,7 +941,7 @@ static void bit_alloc_masking(AC3EncodeContext *s)
 {
     int blk, ch;
 
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
         for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
             /* We only need psd and mask for calculating bap.
@@ -1364,83 +963,131 @@ static void bit_alloc_masking(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Ensure that bap for each block and channel point to the current bap_buffer.
  * They may have been switched during the bit allocation search.
  */
 static void reset_block_bap(AC3EncodeContext *s)
 {
     int blk, ch;
-    int channels = s->channels + 1;
-    if (s->blocks[0].bap[0] == s->bap_buffer)
+    uint8_t *ref_bap;
+
+    if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
         return;
+
+    ref_bap = s->bap_buffer;
+    for (ch = 0; ch <= s->channels; ch++) {
+        for (blk = 0; blk < s->num_blocks; blk++)
+            s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
+        ref_bap += AC3_MAX_COEFS * s->num_blocks;
+    }
+    s->ref_bap_set = 1;
+}
+
+
+/**
+ * Initialize mantissa counts.
+ * These are set so that they are padded to the next whole group size when bits
+ * are counted in compute_mantissa_size.
+ *
+ * @param[in,out] mant_cnt  running counts for each bap value for each block
+ */
+static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
+{
+    int blk;
+
     for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-        for (ch = 0; ch < channels; ch++) {
-            s->blocks[blk].bap[ch] = &s->bap_buffer[AC3_MAX_COEFS * (blk * channels + ch)];
-        }
+        memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
+        mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
+        mant_cnt[blk][4] = 1;
+    }
+}
+
+
+/**
+ * Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
+ * range.
+ *
+ * @param s                 AC-3 encoder private context
+ * @param ch                channel index
+ * @param[in,out] mant_cnt  running counts for each bap value for each block
+ * @param start             starting coefficient bin
+ * @param end               ending coefficient bin
+ */
+static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
+                                          uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
+                                          int start, int end)
+{
+    int blk;
+
+    for (blk = 0; blk < s->num_blocks; blk++) {
+        AC3Block *block = &s->blocks[blk];
+        if (ch == CPL_CH && !block->cpl_in_use)
+            continue;
+        s->ac3dsp.update_bap_counts(mant_cnt[blk],
+                                    s->ref_bap[ch][blk] + start,
+                                    FFMIN(end, block->end_freq[ch]) - start);
     }
 }
 
 
+/*
+ * Count the number of mantissa bits in the frame based on the bap values.
+ */
+static int count_mantissa_bits(AC3EncodeContext *s)
+{
+    int ch, max_end_freq;
+    LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
+
+    count_mantissa_bits_init(mant_cnt);
+
+    max_end_freq = s->bandwidth_code * 3 + 73;
+    for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
+        count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
+                                      max_end_freq);
+
+    return s->ac3dsp.compute_mantissa_size(mant_cnt);
+}
+
+
 /**
  * Run the bit allocation with a given SNR offset.
  * This calculates the bit allocation pointers that will be used to determine
  * the quantization of each mantissa.
+ *
+ * @param s           AC-3 encoder private context
+ * @param snr_offset  SNR offset, 0 to 1023
  * @return the number of bits needed for mantissas if the given SNR offset is
  *         is used.
  */
 static int bit_alloc(AC3EncodeContext *s, int snr_offset)
 {
     int blk, ch;
-    int mantissa_bits;
-    int mant_cnt[5];
 
     snr_offset = (snr_offset - 240) << 2;
 
     reset_block_bap(s);
-    mantissa_bits = 0;
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
-        AC3Block *ref_block;
-        int av_uninit(ch0);
-        int got_cpl = !block->cpl_in_use;
-        // initialize grouped mantissa counts. these are set so that they are
-        // padded to the next whole group size when bits are counted in
-        // compute_mantissa_size_final
-        mant_cnt[0] = mant_cnt[3] = 0;
-        mant_cnt[1] = mant_cnt[2] = 2;
-        mant_cnt[4] = 1;
-        for (ch = 1; ch <= s->channels; ch++) {
-            if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
-                ch0     = ch - 1;
-                ch      = CPL_CH;
-                got_cpl = 1;
-            }
 
+        for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
             /* Currently the only bit allocation parameters which vary across
                blocks within a frame are the exponent values.  We can take
                advantage of that by reusing the bit allocation pointers
                whenever we reuse exponents. */
-            ref_block = block->exp_ref_block[ch];
             if (s->exp_strategy[ch][blk] != EXP_REUSE) {
-                s->ac3dsp.bit_alloc_calc_bap(ref_block->mask[ch], ref_block->psd[ch],
+                s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
                                              s->start_freq[ch], block->end_freq[ch],
                                              snr_offset, s->bit_alloc.floor,
-                                             ff_ac3_bap_tab, ref_block->bap[ch]);
+                                             ff_ac3_bap_tab, s->ref_bap[ch][blk]);
             }
-            mantissa_bits += s->ac3dsp.compute_mantissa_size(mant_cnt,
-                                                             ref_block->bap[ch]+s->start_freq[ch],
-                                                             block->end_freq[ch]-s->start_freq[ch]);
-            if (ch == CPL_CH)
-                ch = ch0;
         }
-        mantissa_bits += compute_mantissa_size_final(mant_cnt);
     }
-    return mantissa_bits;
+    return count_mantissa_bits(s);
 }
 
 
-/**
+/*
  * Constant bitrate bit allocation search.
  * Find the largest SNR offset that will allow data to fit in the frame.
  */
@@ -1489,93 +1136,31 @@ static int cbr_bit_allocation(AC3EncodeContext *s)
 }
 
 
-/**
- * Downgrade exponent strategies to reduce the bits used by the exponents.
- * This is a fallback for when bit allocation fails with the normal exponent
- * strategies.  Each time this function is run it only downgrades the
- * strategy in 1 channel of 1 block.
- * @return non-zero if downgrade was unsuccessful
- */
-static int downgrade_exponents(AC3EncodeContext *s)
-{
-    int ch, blk;
-
-    for (blk = AC3_MAX_BLOCKS-1; blk >= 0; blk--) {
-        for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) {
-            if (s->exp_strategy[ch][blk] == EXP_D15) {
-                s->exp_strategy[ch][blk] = EXP_D25;
-                return 0;
-            }
-        }
-    }
-    for (blk = AC3_MAX_BLOCKS-1; blk >= 0; blk--) {
-        for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) {
-            if (s->exp_strategy[ch][blk] == EXP_D25) {
-                s->exp_strategy[ch][blk] = EXP_D45;
-                return 0;
-            }
-        }
-    }
-    /* block 0 cannot reuse exponents, so only downgrade D45 to REUSE if
-       the block number > 0 */
-    for (blk = AC3_MAX_BLOCKS-1; blk > 0; blk--) {
-        for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) {
-            if (s->exp_strategy[ch][blk] > EXP_REUSE) {
-                s->exp_strategy[ch][blk] = EXP_REUSE;
-                return 0;
-            }
-        }
-    }
-    return -1;
-}
-
-
-/**
+/*
  * Perform bit allocation search.
  * Finds the SNR offset value that maximizes quality and fits in the specified
  * frame size.  Output is the SNR offset and a set of bit allocation pointers
  * used to quantize the mantissas.
  */
-static int compute_bit_allocation(AC3EncodeContext *s)
+int ff_ac3_compute_bit_allocation(AC3EncodeContext *s)
 {
-    int ret;
-
     count_frame_bits(s);
 
-    bit_alloc_masking(s);
-
-    ret = cbr_bit_allocation(s);
-    while (ret) {
-        /* fallback 1: disable channel coupling */
-        if (s->cpl_on) {
-            s->cpl_on = 0;
-            compute_coupling_strategy(s);
-            compute_rematrixing_strategy(s);
-            apply_rematrixing(s);
-            process_exponents(s);
-            ret = compute_bit_allocation(s);
-            continue;
-        }
-
-        /* fallback 2: downgrade exponents */
-        if (!downgrade_exponents(s)) {
-            extract_exponents(s);
-            encode_exponents(s);
-            group_exponents(s);
-            ret = compute_bit_allocation(s);
-            continue;
-        }
+    s->exponent_bits = count_exponent_bits(s);
 
-        /* fallbacks were not enough... */
-        break;
-    }
+    bit_alloc_masking(s);
 
-    return ret;
+    return cbr_bit_allocation(s);
 }
 
 
 /**
  * Symmetric quantization on 'levels' levels.
+ *
+ * @param c       unquantized coefficient
+ * @param e       exponent
+ * @param levels  number of quantization levels
+ * @return        quantized coefficient
  */
 static inline int sym_quant(int c, int e, int levels)
 {
@@ -1587,32 +1172,39 @@ static inline int sym_quant(int c, int e, int levels)
 
 /**
  * Asymmetric quantization on 2^qbits levels.
+ *
+ * @param c      unquantized coefficient
+ * @param e      exponent
+ * @param qbits  number of quantization bits
+ * @return       quantized coefficient
  */
 static inline int asym_quant(int c, int e, int qbits)
 {
-    int lshift, m, v;
+    int m;
 
-    lshift = e + qbits - 24;
-    if (lshift >= 0)
-        v = c << lshift;
-    else
-        v = c >> (-lshift);
-    /* rounding */
-    v = (v + 1) >> 1;
+    c = (((c << e) >> (24 - qbits)) + 1) >> 1;
     m = (1 << (qbits-1));
-    if (v >= m)
-        v = m - 1;
-    av_assert2(v >= -m);
-    return v & ((1 << qbits)-1);
+    if (c >= m)
+        c = m - 1;
+    av_assert2(c >= -m);
+    return c;
 }
 
 
 /**
  * Quantize a set of mantissas for a single channel in a single block.
+ *
+ * @param s           Mantissa count context
+ * @param fixed_coef  unquantized fixed-point coefficients
+ * @param exp         exponents
+ * @param bap         bit allocation pointer indices
+ * @param[out] qmant  quantized coefficients
+ * @param start_freq  starting coefficient bin
+ * @param end_freq    ending coefficient bin
  */
 static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
                                       uint8_t *exp, uint8_t *bap,
-                                      uint16_t *qmant, int start_freq,
+                                      int16_t *qmant, int start_freq,
                                       int end_freq)
 {
     int i;
@@ -1704,14 +1296,15 @@ static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
 
 /**
  * Quantize mantissas using coefficients, exponents, and bit allocation pointers.
+ *
+ * @param s  AC-3 encoder private context
  */
-static void quantize_mantissas(AC3EncodeContext *s)
+void ff_ac3_quantize_mantissas(AC3EncodeContext *s)
 {
     int blk, ch, ch0=0, got_cpl;
 
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
-        AC3Block *ref_block;
         AC3Mant m = { 0 };
 
         got_cpl = !block->cpl_in_use;
@@ -1721,10 +1314,9 @@ static void quantize_mantissas(AC3EncodeContext *s)
                 ch      = CPL_CH;
                 got_cpl = 1;
             }
-            ref_block = block->exp_ref_block[ch];
             quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
-                                      ref_block->exp[ch],
-                                      ref_block->bap[ch], block->qmant[ch],
+                                      s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
+                                      s->ref_bap[ch][blk], block->qmant[ch],
                                       s->start_freq[ch], block->end_freq[ch]);
             if (ch == CPL_CH)
                 ch = ch0;
@@ -1733,10 +1325,10 @@ static void quantize_mantissas(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Write the AC-3 frame header to the output bitstream.
  */
-static void output_frame_header(AC3EncodeContext *s)
+static void ac3_output_frame_header(AC3EncodeContext *s)
 {
     AC3EncOptions *opt = &s->options;
 
@@ -1789,42 +1381,60 @@ static void output_frame_header(AC3EncodeContext *s)
 }
 
 
-/**
+/*
  * Write one audio block to the output bitstream.
  */
 static void output_audio_block(AC3EncodeContext *s, int blk)
 {
-    int ch, i, baie, bnd, got_cpl;
-    int av_uninit(ch0);
+    int ch, i, baie, bnd, got_cpl, ch0;
     AC3Block *block = &s->blocks[blk];
 
     /* block switching */
-    for (ch = 0; ch < s->fbw_channels; ch++)
-        put_bits(&s->pb, 1, 0);
+    if (!s->eac3) {
+        for (ch = 0; ch < s->fbw_channels; ch++)
+            put_bits(&s->pb, 1, 0);
+    }
 
     /* dither flags */
-    for (ch = 0; ch < s->fbw_channels; ch++)
-        put_bits(&s->pb, 1, 1);
+    if (!s->eac3) {
+        for (ch = 0; ch < s->fbw_channels; ch++)
+            put_bits(&s->pb, 1, 1);
+    }
 
     /* dynamic range codes */
     put_bits(&s->pb, 1, 0);
 
+    /* spectral extension */
+    if (s->eac3)
+        put_bits(&s->pb, 1, 0);
+
     /* channel coupling */
-    put_bits(&s->pb, 1, block->new_cpl_strategy);
+    if (!s->eac3)
+        put_bits(&s->pb, 1, block->new_cpl_strategy);
     if (block->new_cpl_strategy) {
-        put_bits(&s->pb, 1, block->cpl_in_use);
+        if (!s->eac3)
+            put_bits(&s->pb, 1, block->cpl_in_use);
         if (block->cpl_in_use) {
             int start_sub, end_sub;
-            for (ch = 1; ch <= s->fbw_channels; ch++)
-                put_bits(&s->pb, 1, block->channel_in_cpl[ch]);
+            if (s->eac3)
+                put_bits(&s->pb, 1, 0); /* enhanced coupling */
+            if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
+                for (ch = 1; ch <= s->fbw_channels; ch++)
+                    put_bits(&s->pb, 1, block->channel_in_cpl[ch]);
+            }
             if (s->channel_mode == AC3_CHMODE_STEREO)
                 put_bits(&s->pb, 1, 0); /* phase flags in use */
             start_sub = (s->start_freq[CPL_CH] - 37) / 12;
             end_sub   = (s->cpl_end_freq       - 37) / 12;
             put_bits(&s->pb, 4, start_sub);
             put_bits(&s->pb, 4, end_sub - 3);
-            for (bnd = start_sub+1; bnd < end_sub; bnd++)
-                put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
+            /* coupling band structure */
+            if (s->eac3) {
+                put_bits(&s->pb, 1, 0); /* use default */
+            } else {
+                for (bnd = start_sub+1; bnd < end_sub; bnd++)
+                    put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
+            }
         }
     }
 
@@ -1832,8 +1442,9 @@ static void output_audio_block(AC3EncodeContext *s, int blk)
     if (block->cpl_in_use) {
         for (ch = 1; ch <= s->fbw_channels; ch++) {
             if (block->channel_in_cpl[ch]) {
-                put_bits(&s->pb, 1, block->new_cpl_coords);
-                if (block->new_cpl_coords) {
+                if (!s->eac3 || block->new_cpl_coords[ch] != 2)
+                    put_bits(&s->pb, 1, block->new_cpl_coords[ch]);
+                if (block->new_cpl_coords[ch]) {
                     put_bits(&s->pb, 2, block->cpl_master_exp[ch]);
                     for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
                         put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]);
@@ -1846,7 +1457,8 @@ static void output_audio_block(AC3EncodeContext *s, int blk)
 
     /* stereo rematrixing */
     if (s->channel_mode == AC3_CHMODE_STEREO) {
-        put_bits(&s->pb, 1, block->new_rematrixing_strategy);
+        if (!s->eac3 || blk > 0)
+            put_bits(&s->pb, 1, block->new_rematrixing_strategy);
         if (block->new_rematrixing_strategy) {
             /* rematrixing flags */
             for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
@@ -1855,10 +1467,12 @@ static void output_audio_block(AC3EncodeContext *s, int blk)
     }
 
     /* exponent strategy */
-    for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
-        put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
-    if (s->lfe_on)
-        put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
+    if (!s->eac3) {
+        for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
+            put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
+        if (s->lfe_on)
+            put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
+    }
 
     /* bandwidth */
     for (ch = 1; ch <= s->fbw_channels; ch++) {
@@ -1888,62 +1502,69 @@ static void output_audio_block(AC3EncodeContext *s, int blk)
     }
 
     /* bit allocation info */
-    baie = (blk == 0);
-    put_bits(&s->pb, 1, baie);
-    if (baie) {
-        put_bits(&s->pb, 2, s->slow_decay_code);
-        put_bits(&s->pb, 2, s->fast_decay_code);
-        put_bits(&s->pb, 2, s->slow_gain_code);
-        put_bits(&s->pb, 2, s->db_per_bit_code);
-        put_bits(&s->pb, 3, s->floor_code);
+    if (!s->eac3) {
+        baie = (blk == 0);
+        put_bits(&s->pb, 1, baie);
+        if (baie) {
+            put_bits(&s->pb, 2, s->slow_decay_code);
+            put_bits(&s->pb, 2, s->fast_decay_code);
+            put_bits(&s->pb, 2, s->slow_gain_code);
+            put_bits(&s->pb, 2, s->db_per_bit_code);
+            put_bits(&s->pb, 3, s->floor_code);
+        }
     }
 
     /* snr offset */
-    put_bits(&s->pb, 1, block->new_snr_offsets);
-    if (block->new_snr_offsets) {
-        put_bits(&s->pb, 6, s->coarse_snr_offset);
-        for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
-            put_bits(&s->pb, 4, s->fine_snr_offset[ch]);
-            put_bits(&s->pb, 3, s->fast_gain_code[ch]);
+    if (!s->eac3) {
+        put_bits(&s->pb, 1, block->new_snr_offsets);
+        if (block->new_snr_offsets) {
+            put_bits(&s->pb, 6, s->coarse_snr_offset);
+            for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
+                put_bits(&s->pb, 4, s->fine_snr_offset[ch]);
+                put_bits(&s->pb, 3, s->fast_gain_code[ch]);
+            }
         }
+    } else {
+        put_bits(&s->pb, 1, 0); /* no converter snr offset */
     }
 
     /* coupling leak */
     if (block->cpl_in_use) {
-        put_bits(&s->pb, 1, block->new_cpl_leak);
+        if (!s->eac3 || block->new_cpl_leak != 2)
+            put_bits(&s->pb, 1, block->new_cpl_leak);
         if (block->new_cpl_leak) {
             put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak);
             put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak);
         }
     }
 
-    put_bits(&s->pb, 1, 0); /* no delta bit allocation */
-    put_bits(&s->pb, 1, 0); /* no data to skip */
+    if (!s->eac3) {
+        put_bits(&s->pb, 1, 0); /* no delta bit allocation */
+        put_bits(&s->pb, 1, 0); /* no data to skip */
+    }
 
     /* mantissas */
     got_cpl = !block->cpl_in_use;
     for (ch = 1; ch <= s->channels; ch++) {
         int b, q;
-        AC3Block *ref_block;
 
         if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
             ch0     = ch - 1;
             ch      = CPL_CH;
             got_cpl = 1;
         }
-        ref_block = block->exp_ref_block[ch];
         for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
             q = block->qmant[ch][i];
-            b = ref_block->bap[ch][i];
+            b = s->ref_bap[ch][blk][i];
             switch (b) {
-            case 0:                                         break;
-            case 1: if (q != 128) put_bits(&s->pb,   5, q); break;
-            case 2: if (q != 128) put_bits(&s->pb,   7, q); break;
-            case 3:               put_bits(&s->pb,   3, q); break;
-            case 4: if (q != 128) put_bits(&s->pb,   7, q); break;
-            case 14:              put_bits(&s->pb,  14, q); break;
-            case 15:              put_bits(&s->pb,  16, q); break;
-            default:              put_bits(&s->pb, b-1, q); break;
+            case 0:                                          break;
+            case 1: if (q != 128) put_bits (&s->pb,   5, q); break;
+            case 2: if (q != 128) put_bits (&s->pb,   7, q); break;
+            case 3:               put_sbits(&s->pb,   3, q); break;
+            case 4: if (q != 128) put_bits (&s->pb,   7, q); break;
+            case 14:              put_sbits(&s->pb,  14, q); break;
+            case 15:              put_sbits(&s->pb,  16, q); break;
+            default:              put_sbits(&s->pb, b-1, q); break;
             }
         }
         if (ch == CPL_CH)
@@ -1987,7 +1608,7 @@ static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
 }
 
 
-/**
+/*
  * Fill the end of the frame with 0's and compute the two CRCs.
  */
 static void output_frame_end(AC3EncodeContext *s)
@@ -2007,6 +1628,10 @@ static void output_frame_end(AC3EncodeContext *s)
     if (pad_bytes > 0)
         memset(put_bits_ptr(&s->pb), 0, pad_bytes);
 
+    if (s->eac3) {
+        /* compute crc2 */
+        crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5);
+    } else {
     /* compute crc1 */
     /* this is not so easy because it is at the beginning of the data... */
     crc1    = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
@@ -2017,6 +1642,7 @@ static void output_frame_end(AC3EncodeContext *s)
     /* compute crc2 */
     crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58,
                           s->frame_size - frame_size_58 - 3);
+    }
     crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
     /* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
     if (crc2 == 0x770B) {
@@ -2030,34 +1656,38 @@ static void output_frame_end(AC3EncodeContext *s)
 
 /**
  * Write the frame to the output bitstream.
+ *
+ * @param s      AC-3 encoder private context
+ * @param frame  output data buffer
  */
-static void output_frame(AC3EncodeContext *s, unsigned char *frame)
+void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame)
 {
     int blk;
 
     init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE);
 
-    output_frame_header(s);
+    s->output_frame_header(s);
 
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
+    for (blk = 0; blk < s->num_blocks; blk++)
         output_audio_block(s, blk);
 
     output_frame_end(s);
 }
 
 
-static void dprint_options(AVCodecContext *avctx)
+static void dprint_options(AC3EncodeContext *s)
 {
 #ifdef DEBUG
-    AC3EncodeContext *s = avctx->priv_data;
+    AVCodecContext *avctx = s->avctx;
     AC3EncOptions *opt = &s->options;
     char strbuf[32];
 
     switch (s->bitstream_id) {
-    case  6:  av_strlcpy(strbuf, "AC-3 (alt syntax)", 32);      break;
-    case  8:  av_strlcpy(strbuf, "AC-3 (standard)", 32);        break;
-    case  9:  av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32);  break;
-    case 10:  av_strlcpy(strbuf, "AC-3 (dnet quater-rate", 32); break;
+    case  6:  av_strlcpy(strbuf, "AC-3 (alt syntax)",       32); break;
+    case  8:  av_strlcpy(strbuf, "AC-3 (standard)",         32); break;
+    case  9:  av_strlcpy(strbuf, "AC-3 (dnet half-rate)",   32); break;
+    case 10:  av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break;
+    case 16:  av_strlcpy(strbuf, "E-AC-3 (enhanced)",       32); break;
     default: snprintf(strbuf, 32, "ERROR");
     }
     av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
@@ -2066,6 +1696,7 @@ static void dprint_options(AVCodecContext *avctx)
     av_dlog(avctx, "channel_layout: %s\n", strbuf);
     av_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
     av_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
+    av_dlog(avctx, "blocks/frame: %d (code=%d)\n", s->num_blocks, s->num_blks_code);
     if (s->cutoff)
         av_dlog(avctx, "cutoff: %d\n", s->cutoff);
 
@@ -2084,9 +1715,9 @@ static void dprint_options(AVCodecContext *avctx)
     if (opt->audio_production_info) {
         av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
         switch (opt->room_type) {
-        case 0:  av_strlcpy(strbuf, "notindicated", 32); break;
-        case 1:  av_strlcpy(strbuf, "large", 32);        break;
-        case 2:  av_strlcpy(strbuf, "small", 32);        break;
+        case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
+        case AC3ENC_OPT_LARGE_ROOM:    av_strlcpy(strbuf, "large", 32);        break;
+        case AC3ENC_OPT_SMALL_ROOM:    av_strlcpy(strbuf, "small", 32);        break;
         default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
         }
         av_dlog(avctx, "room_type: %s\n", strbuf);
@@ -2098,9 +1729,9 @@ static void dprint_options(AVCodecContext *avctx)
     av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
     if (s->channel_mode == AC3_CHMODE_STEREO) {
         switch (opt->dolby_surround_mode) {
-        case 0:  av_strlcpy(strbuf, "notindicated", 32); break;
-        case 1:  av_strlcpy(strbuf, "on", 32);           break;
-        case 2:  av_strlcpy(strbuf, "off", 32);          break;
+        case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
+        case AC3ENC_OPT_MODE_ON:       av_strlcpy(strbuf, "on", 32);           break;
+        case AC3ENC_OPT_MODE_OFF:      av_strlcpy(strbuf, "off", 32);          break;
         default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
         }
         av_dlog(avctx, "dsur_mode: %s\n", strbuf);
@@ -2112,9 +1743,9 @@ static void dprint_options(AVCodecContext *avctx)
     if (s->bitstream_id == 6) {
         if (opt->extended_bsi_1) {
             switch (opt->preferred_stereo_downmix) {
-            case 0:  av_strlcpy(strbuf, "notindicated", 32); break;
-            case 1:  av_strlcpy(strbuf, "ltrt", 32);         break;
-            case 2:  av_strlcpy(strbuf, "loro", 32);         break;
+            case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
+            case AC3ENC_OPT_DOWNMIX_LTRT:  av_strlcpy(strbuf, "ltrt", 32);         break;
+            case AC3ENC_OPT_DOWNMIX_LORO:  av_strlcpy(strbuf, "loro", 32);         break;
             default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
             }
             av_dlog(avctx, "dmix_mode: %s\n", strbuf);
@@ -2131,23 +1762,23 @@ static void dprint_options(AVCodecContext *avctx)
         }
         if (opt->extended_bsi_2) {
             switch (opt->dolby_surround_ex_mode) {
-            case 0:  av_strlcpy(strbuf, "notindicated", 32); break;
-            case 1:  av_strlcpy(strbuf, "on", 32);           break;
-            case 2:  av_strlcpy(strbuf, "off", 32);          break;
+            case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
+            case AC3ENC_OPT_MODE_ON:       av_strlcpy(strbuf, "on", 32);           break;
+            case AC3ENC_OPT_MODE_OFF:      av_strlcpy(strbuf, "off", 32);          break;
             default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode);
             }
             av_dlog(avctx, "dsurex_mode: %s\n", strbuf);
             switch (opt->dolby_headphone_mode) {
-            case 0:  av_strlcpy(strbuf, "notindicated", 32); break;
-            case 1:  av_strlcpy(strbuf, "on", 32);           break;
-            case 2:  av_strlcpy(strbuf, "off", 32);          break;
+            case AC3ENC_OPT_NOT_INDICATED: av_strlcpy(strbuf, "notindicated", 32); break;
+            case AC3ENC_OPT_MODE_ON:       av_strlcpy(strbuf, "on", 32);           break;
+            case AC3ENC_OPT_MODE_OFF:      av_strlcpy(strbuf, "off", 32);          break;
             default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode);
             }
             av_dlog(avctx, "dheadphone_mode: %s\n", strbuf);
 
             switch (opt->ad_converter_type) {
-            case 0:  av_strlcpy(strbuf, "standard", 32); break;
-            case 1:  av_strlcpy(strbuf, "hdcd", 32);     break;
+            case AC3ENC_OPT_ADCONV_STANDARD: av_strlcpy(strbuf, "standard", 32); break;
+            case AC3ENC_OPT_ADCONV_HDCD:     av_strlcpy(strbuf, "hdcd", 32);     break;
             default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
             }
             av_dlog(avctx, "ad_conv_type: %s\n", strbuf);
@@ -2198,27 +1829,155 @@ static void validate_mix_level(void *log_ctx, const char *opt_name,
 /**
  * Validate metadata options as set by AVOption system.
  * These values can optionally be changed per-frame.
+ *
+ * @param s  AC-3 encoder private context
  */
-static int validate_metadata(AVCodecContext *avctx)
+int ff_ac3_validate_metadata(AC3EncodeContext *s)
 {
-    AC3EncodeContext *s = avctx->priv_data;
+    AVCodecContext *avctx = s->avctx;
     AC3EncOptions *opt = &s->options;
 
-    /* validate mixing levels */
-    if (s->has_center) {
-        validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
-                           cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
-                           &s->center_mix_level);
+    opt->audio_production_info = 0;
+    opt->extended_bsi_1        = 0;
+    opt->extended_bsi_2        = 0;
+    opt->eac3_mixing_metadata  = 0;
+    opt->eac3_info_metadata    = 0;
+
+    /* determine mixing metadata / xbsi1 use */
+    if (s->channel_mode > AC3_CHMODE_STEREO && opt->preferred_stereo_downmix != AC3ENC_OPT_NONE) {
+        opt->extended_bsi_1       = 1;
+        opt->eac3_mixing_metadata = 1;
+    }
+    if (s->has_center &&
+        (opt->ltrt_center_mix_level >= 0 || opt->loro_center_mix_level >= 0)) {
+        opt->extended_bsi_1       = 1;
+        opt->eac3_mixing_metadata = 1;
+    }
+    if (s->has_surround &&
+        (opt->ltrt_surround_mix_level >= 0 || opt->loro_surround_mix_level >= 0)) {
+        opt->extended_bsi_1       = 1;
+        opt->eac3_mixing_metadata = 1;
+    }
+
+    if (s->eac3) {
+        /* determine info metadata use */
+        if (avctx->audio_service_type != AV_AUDIO_SERVICE_TYPE_MAIN)
+            opt->eac3_info_metadata = 1;
+        if (opt->copyright != AC3ENC_OPT_NONE || opt->original != AC3ENC_OPT_NONE)
+            opt->eac3_info_metadata = 1;
+        if (s->channel_mode == AC3_CHMODE_STEREO &&
+            (opt->dolby_headphone_mode != AC3ENC_OPT_NONE || opt->dolby_surround_mode != AC3ENC_OPT_NONE))
+            opt->eac3_info_metadata = 1;
+        if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
+            opt->eac3_info_metadata = 1;
+        if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE ||
+            opt->ad_converter_type != AC3ENC_OPT_NONE) {
+            opt->audio_production_info = 1;
+            opt->eac3_info_metadata    = 1;
+        }
+    } else {
+        /* determine audio production info use */
+        if (opt->mixing_level != AC3ENC_OPT_NONE || opt->room_type != AC3ENC_OPT_NONE)
+            opt->audio_production_info = 1;
+
+        /* determine xbsi2 use */
+        if (s->channel_mode >= AC3_CHMODE_2F2R && opt->dolby_surround_ex_mode != AC3ENC_OPT_NONE)
+            opt->extended_bsi_2 = 1;
+        if (s->channel_mode == AC3_CHMODE_STEREO && opt->dolby_headphone_mode != AC3ENC_OPT_NONE)
+            opt->extended_bsi_2 = 1;
+        if (opt->ad_converter_type != AC3ENC_OPT_NONE)
+            opt->extended_bsi_2 = 1;
+    }
+
+    /* validate AC-3 mixing levels */
+    if (!s->eac3) {
+        if (s->has_center) {
+            validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
+                            cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
+                            &s->center_mix_level);
+        }
+        if (s->has_surround) {
+            validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
+                            surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
+                            &s->surround_mix_level);
+        }
+    }
+
+    /* validate extended bsi 1 / mixing metadata */
+    if (opt->extended_bsi_1 || opt->eac3_mixing_metadata) {
+        /* default preferred stereo downmix */
+        if (opt->preferred_stereo_downmix == AC3ENC_OPT_NONE)
+            opt->preferred_stereo_downmix = AC3ENC_OPT_NOT_INDICATED;
+        if (!s->eac3 || s->has_center) {
+            /* validate Lt/Rt center mix level */
+            validate_mix_level(avctx, "ltrt_center_mix_level",
+                               &opt->ltrt_center_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 5, 0,
+                               &s->ltrt_center_mix_level);
+            /* validate Lo/Ro center mix level */
+            validate_mix_level(avctx, "loro_center_mix_level",
+                               &opt->loro_center_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 5, 0,
+                               &s->loro_center_mix_level);
+        }
+        if (!s->eac3 || s->has_surround) {
+            /* validate Lt/Rt surround mix level */
+            validate_mix_level(avctx, "ltrt_surround_mix_level",
+                               &opt->ltrt_surround_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 6, 3,
+                               &s->ltrt_surround_mix_level);
+            /* validate Lo/Ro surround mix level */
+            validate_mix_level(avctx, "loro_surround_mix_level",
+                               &opt->loro_surround_mix_level, extmixlev_options,
+                               EXTMIXLEV_NUM_OPTIONS, 6, 3,
+                               &s->loro_surround_mix_level);
+        }
+    }
+
+    /* validate audio service type / channels combination */
+    if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
+         avctx->channels == 1) ||
+        ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
+          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY  ||
+          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
+         && avctx->channels > 1)) {
+        av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
+                                    "specified number of channels\n");
+        return AVERROR(EINVAL);
+    }
+
+    /* validate extended bsi 2 / info metadata */
+    if (opt->extended_bsi_2 || opt->eac3_info_metadata) {
+        /* default dolby headphone mode */
+        if (opt->dolby_headphone_mode == AC3ENC_OPT_NONE)
+            opt->dolby_headphone_mode = AC3ENC_OPT_NOT_INDICATED;
+        /* default dolby surround ex mode */
+        if (opt->dolby_surround_ex_mode == AC3ENC_OPT_NONE)
+            opt->dolby_surround_ex_mode = AC3ENC_OPT_NOT_INDICATED;
+        /* default A/D converter type */
+        if (opt->ad_converter_type == AC3ENC_OPT_NONE)
+            opt->ad_converter_type = AC3ENC_OPT_ADCONV_STANDARD;
+    }
+
+    /* copyright & original defaults */
+    if (!s->eac3 || opt->eac3_info_metadata) {
+        /* default copyright */
+        if (opt->copyright == AC3ENC_OPT_NONE)
+            opt->copyright = AC3ENC_OPT_OFF;
+        /* default original */
+        if (opt->original == AC3ENC_OPT_NONE)
+            opt->original = AC3ENC_OPT_ON;
     }
-    if (s->has_surround) {
-        validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
-                           surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
-                           &s->surround_mix_level);
+
+    /* dolby surround mode default */
+    if (!s->eac3 || opt->eac3_info_metadata) {
+        if (opt->dolby_surround_mode == AC3ENC_OPT_NONE)
+            opt->dolby_surround_mode = AC3ENC_OPT_NOT_INDICATED;
     }
 
-    /* set audio production info flag */
-    if (opt->mixing_level >= 0 || opt->room_type >= 0) {
-        if (opt->mixing_level < 0) {
+    /* validate audio production info */
+    if (opt->audio_production_info) {
+        if (opt->mixing_level == AC3ENC_OPT_NONE) {
             av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
                    "room_type is set\n");
             return AVERROR(EINVAL);
@@ -2229,68 +1988,12 @@ static int validate_metadata(AVCodecContext *avctx)
             return AVERROR(EINVAL);
         }
         /* default room type */
-        if (opt->room_type < 0)
-            opt->room_type = 0;
-        opt->audio_production_info = 1;
-    } else {
-        opt->audio_production_info = 0;
-    }
-
-    /* set extended bsi 1 flag */
-    if ((s->has_center || s->has_surround) &&
-        (opt->preferred_stereo_downmix >= 0 ||
-         opt->ltrt_center_mix_level   >= 0 ||
-         opt->ltrt_surround_mix_level >= 0 ||
-         opt->loro_center_mix_level   >= 0 ||
-         opt->loro_surround_mix_level >= 0)) {
-        /* default preferred stereo downmix */
-        if (opt->preferred_stereo_downmix < 0)
-            opt->preferred_stereo_downmix = 0;
-        /* validate Lt/Rt center mix level */
-        validate_mix_level(avctx, "ltrt_center_mix_level",
-                           &opt->ltrt_center_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 5, 0,
-                           &s->ltrt_center_mix_level);
-        /* validate Lt/Rt surround mix level */
-        validate_mix_level(avctx, "ltrt_surround_mix_level",
-                           &opt->ltrt_surround_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 6, 3,
-                           &s->ltrt_surround_mix_level);
-        /* validate Lo/Ro center mix level */
-        validate_mix_level(avctx, "loro_center_mix_level",
-                           &opt->loro_center_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 5, 0,
-                           &s->loro_center_mix_level);
-        /* validate Lo/Ro surround mix level */
-        validate_mix_level(avctx, "loro_surround_mix_level",
-                           &opt->loro_surround_mix_level, extmixlev_options,
-                           EXTMIXLEV_NUM_OPTIONS, 6, 3,
-                           &s->loro_surround_mix_level);
-        opt->extended_bsi_1 = 1;
-    } else {
-        opt->extended_bsi_1 = 0;
-    }
-
-    /* set extended bsi 2 flag */
-    if (opt->dolby_surround_ex_mode >= 0 ||
-        opt->dolby_headphone_mode   >= 0 ||
-        opt->ad_converter_type      >= 0) {
-        /* default dolby surround ex mode */
-        if (opt->dolby_surround_ex_mode < 0)
-            opt->dolby_surround_ex_mode = 0;
-        /* default dolby headphone mode */
-        if (opt->dolby_headphone_mode < 0)
-            opt->dolby_headphone_mode = 0;
-        /* default A/D converter type */
-        if (opt->ad_converter_type < 0)
-            opt->ad_converter_type = 0;
-        opt->extended_bsi_2 = 1;
-    } else {
-        opt->extended_bsi_2 = 0;
+        if (opt->room_type == AC3ENC_OPT_NONE)
+            opt->room_type = AC3ENC_OPT_NOT_INDICATED;
     }
 
     /* set bitstream id for alternate bitstream syntax */
-    if (opt->extended_bsi_1 || opt->extended_bsi_2) {
+    if (!s->eac3 && (opt->extended_bsi_1 || opt->extended_bsi_2)) {
         if (s->bitstream_id > 8 && s->bitstream_id < 11) {
             static int warn_once = 1;
             if (warn_once) {
@@ -2309,64 +2012,16 @@ static int validate_metadata(AVCodecContext *avctx)
 
 
 /**
- * Encode a single AC-3 frame.
- */
-static int ac3_encode_frame(AVCodecContext *avctx, unsigned char *frame,
-                            int buf_size, void *data)
-{
-    AC3EncodeContext *s = avctx->priv_data;
-    const SampleType *samples = data;
-    int ret;
-
-    if (s->options.allow_per_frame_metadata) {
-        ret = validate_metadata(avctx);
-        if (ret)
-            return ret;
-    }
-
-    if (s->bit_alloc.sr_code == 1)
-        adjust_frame_size(s);
-
-    deinterleave_input_samples(s, samples);
-
-    apply_mdct(s);
-
-    scale_coefficients(s);
-
-    s->cpl_on = s->cpl_enabled;
-    compute_coupling_strategy(s);
-
-    if (s->cpl_on)
-        apply_channel_coupling(s);
-
-    compute_rematrixing_strategy(s);
-
-    apply_rematrixing(s);
-
-    process_exponents(s);
-
-    ret = compute_bit_allocation(s);
-    if (ret) {
-        av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
-        return ret;
-    }
-
-    quantize_mantissas(s);
-
-    output_frame(s, frame);
-
-    return s->frame_size;
-}
-
-
-/**
  * Finalize encoding and free any memory allocated by the encoder.
+ *
+ * @param avctx  Codec context
  */
-static av_cold int ac3_encode_close(AVCodecContext *avctx)
+av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
 {
     int blk, ch;
     AC3EncodeContext *s = avctx->priv_data;
 
+    av_freep(&s->windowed_samples);
     for (ch = 0; ch < s->channels; ch++)
         av_freep(&s->planar_samples[ch]);
     av_freep(&s->planar_samples);
@@ -2380,9 +2035,10 @@ static av_cold int ac3_encode_close(AVCodecContext *avctx)
     av_freep(&s->band_psd_buffer);
     av_freep(&s->mask_buffer);
     av_freep(&s->qmant_buffer);
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    av_freep(&s->cpl_coord_exp_buffer);
+    av_freep(&s->cpl_coord_mant_buffer);
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
-        av_freep(&block->bap);
         av_freep(&block->mdct_coef);
         av_freep(&block->fixed_coef);
         av_freep(&block->exp);
@@ -2391,30 +2047,34 @@ static av_cold int ac3_encode_close(AVCodecContext *avctx)
         av_freep(&block->band_psd);
         av_freep(&block->mask);
         av_freep(&block->qmant);
+        av_freep(&block->cpl_coord_exp);
+        av_freep(&block->cpl_coord_mant);
     }
 
-    mdct_end(&s->mdct);
+    s->mdct_end(s);
 
+#if FF_API_OLD_ENCODE_AUDIO
     av_freep(&avctx->coded_frame);
+#endif
     return 0;
 }
 
 
-/**
+/*
  * Set channel information during initialization.
  */
 static av_cold int set_channel_info(AC3EncodeContext *s, int channels,
-                                    int64_t *channel_layout)
+                                    uint64_t *channel_layout)
 {
     int ch_layout;
 
     if (channels < 1 || channels > AC3_MAX_CHANNELS)
         return AVERROR(EINVAL);
-    if ((uint64_t)*channel_layout > 0x7FF)
+    if (*channel_layout > 0x7FF)
         return AVERROR(EINVAL);
     ch_layout = *channel_layout;
     if (!ch_layout)
-        ch_layout = avcodec_guess_channel_layout(channels, CODEC_ID_AC3, NULL);
+        ch_layout = av_get_default_channel_layout(channels);
 
     s->lfe_on       = !!(ch_layout & AV_CH_LOW_FREQUENCY);
     s->channels     = channels;
@@ -2448,9 +2108,10 @@ static av_cold int set_channel_info(AC3EncodeContext *s, int channels,
 }
 
 
-static av_cold int validate_options(AVCodecContext *avctx, AC3EncodeContext *s)
+static av_cold int validate_options(AC3EncodeContext *s)
 {
-    int i, ret;
+    AVCodecContext *avctx = s->avctx;
+    int i, ret, max_sr;
 
     /* validate channel layout */
     if (!avctx->channel_layout) {
@@ -2465,30 +2126,102 @@ static av_cold int validate_options(AVCodecContext *avctx, AC3EncodeContext *s)
     }
 
     /* validate sample rate */
-    for (i = 0; i < 9; i++) {
-        if ((ff_ac3_sample_rate_tab[i / 3] >> (i % 3)) == avctx->sample_rate)
+    /* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a
+             decoder that supports half sample rate so we can validate that
+             the generated files are correct. */
+    max_sr = s->eac3 ? 2 : 8;
+    for (i = 0; i <= max_sr; i++) {
+        if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate)
             break;
     }
-    if (i == 9) {
+    if (i > max_sr) {
         av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
         return AVERROR(EINVAL);
     }
     s->sample_rate        = avctx->sample_rate;
-    s->bit_alloc.sr_shift = i % 3;
-    s->bit_alloc.sr_code  = i / 3;
-    s->bitstream_id       = 8 + s->bit_alloc.sr_shift;
+    s->bit_alloc.sr_shift = i / 3;
+    s->bit_alloc.sr_code  = i % 3;
+    s->bitstream_id       = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift;
 
-    /* validate bit rate */
-    for (i = 0; i < 19; i++) {
-        if ((ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift)*1000 == avctx->bit_rate)
-            break;
+    /* select a default bit rate if not set by the user */
+    if (!avctx->bit_rate) {
+        switch (s->fbw_channels) {
+        case 1: avctx->bit_rate =  96000; break;
+        case 2: avctx->bit_rate = 192000; break;
+        case 3: avctx->bit_rate = 320000; break;
+        case 4: avctx->bit_rate = 384000; break;
+        case 5: avctx->bit_rate = 448000; break;
+        }
     }
-    if (i == 19) {
-        av_log(avctx, AV_LOG_ERROR, "invalid bit rate\n");
-        return AVERROR(EINVAL);
+
+    /* validate bit rate */
+    if (s->eac3) {
+        int max_br, min_br, wpf, min_br_dist, min_br_code;
+        int num_blks_code, num_blocks, frame_samples;
+
+        /* calculate min/max bitrate */
+        /* TODO: More testing with 3 and 2 blocks. All E-AC-3 samples I've
+                 found use either 6 blocks or 1 block, even though 2 or 3 blocks
+                 would work as far as the bit rate is concerned. */
+        for (num_blks_code = 3; num_blks_code >= 0; num_blks_code--) {
+            num_blocks = ((int[]){ 1, 2, 3, 6 })[num_blks_code];
+            frame_samples  = AC3_BLOCK_SIZE * num_blocks;
+            max_br = 2048 * s->sample_rate / frame_samples * 16;
+            min_br = ((s->sample_rate + (frame_samples-1)) / frame_samples) * 16;
+            if (avctx->bit_rate <= max_br)
+                break;
+        }
+        if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
+            av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
+                   "for this sample rate\n", min_br, max_br);
+            return AVERROR(EINVAL);
+        }
+        s->num_blks_code = num_blks_code;
+        s->num_blocks    = num_blocks;
+
+        /* calculate words-per-frame for the selected bitrate */
+        wpf = (avctx->bit_rate / 16) * frame_samples / s->sample_rate;
+        av_assert1(wpf > 0 && wpf <= 2048);
+
+        /* find the closest AC-3 bitrate code to the selected bitrate.
+           this is needed for lookup tables for bandwidth and coupling
+           parameter selection */
+        min_br_code = -1;
+        min_br_dist = INT_MAX;
+        for (i = 0; i < 19; i++) {
+            int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
+            if (br_dist < min_br_dist) {
+                min_br_dist = br_dist;
+                min_br_code = i;
+            }
+        }
+
+        /* make sure the minimum frame size is below the average frame size */
+        s->frame_size_code = min_br_code << 1;
+        while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
+            wpf--;
+        s->frame_size_min = 2 * wpf;
+    } else {
+        int best_br = 0, best_code = 0, best_diff = INT_MAX;
+        for (i = 0; i < 19; i++) {
+            int br   = (ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift) * 1000;
+            int diff = abs(br - avctx->bit_rate);
+            if (diff < best_diff) {
+                best_br   = br;
+                best_code = i;
+                best_diff = diff;
+            }
+            if (!best_diff)
+                break;
+        }
+        avctx->bit_rate    = best_br;
+        s->frame_size_code = best_code << 1;
+        s->frame_size_min  = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
+        s->num_blks_code   = 0x3;
+        s->num_blocks      = 6;
     }
-    s->bit_rate        = avctx->bit_rate;
-    s->frame_size_code = i << 1;
+    s->bit_rate   = avctx->bit_rate;
+    s->frame_size = s->frame_size_min;
 
     /* validate cutoff */
     if (avctx->cutoff < 0) {
@@ -2499,19 +2232,7 @@ static av_cold int validate_options(AVCodecContext *avctx, AC3EncodeContext *s)
     if (s->cutoff > (s->sample_rate >> 1))
         s->cutoff = s->sample_rate >> 1;
 
-    /* validate audio service type / channels combination */
-    if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
-         avctx->channels == 1) ||
-        ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
-          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY  ||
-          avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
-         && avctx->channels > 1)) {
-        av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
-                                    "specified number of channels\n");
-        return AVERROR(EINVAL);
-    }
-
-    ret = validate_metadata(avctx);
+    ret = ff_ac3_validate_metadata(s);
     if (ret)
         return ret;
 
@@ -2519,22 +2240,20 @@ static av_cold int validate_options(AVCodecContext *avctx, AC3EncodeContext *s)
                              (s->channel_mode == AC3_CHMODE_STEREO);
 
     s->cpl_enabled = s->options.channel_coupling &&
-                     s->channel_mode >= AC3_CHMODE_STEREO &&
-                     CONFIG_AC3ENC_FLOAT;
+                     s->channel_mode >= AC3_CHMODE_STEREO;
 
     return 0;
 }
 
 
-/**
+/*
  * Set bandwidth for all channels.
  * The user can optionally supply a cutoff frequency. Otherwise an appropriate
  * default value will be used.
  */
 static av_cold void set_bandwidth(AC3EncodeContext *s)
 {
-    int blk, ch;
-    int av_uninit(cpl_start);
+    int blk, ch, cpl_start;
 
     if (s->cutoff) {
         /* calculate bandwidth based on user-specified cutoff frequency */
@@ -2549,24 +2268,28 @@ static av_cold void set_bandwidth(AC3EncodeContext *s)
     /* set number of coefficients for each channel */
     for (ch = 1; ch <= s->fbw_channels; ch++) {
         s->start_freq[ch] = 0;
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
+        for (blk = 0; blk < s->num_blocks; blk++)
             s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
     }
     /* LFE channel always has 7 coefs */
     if (s->lfe_on) {
         s->start_freq[s->lfe_channel] = 0;
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
+        for (blk = 0; blk < s->num_blocks; blk++)
             s->blocks[blk].end_freq[ch] = 7;
     }
 
     /* initialize coupling strategy */
     if (s->cpl_enabled) {
-        if (s->options.cpl_start >= 0) {
+        if (s->options.cpl_start != AC3ENC_OPT_AUTO) {
             cpl_start = s->options.cpl_start;
         } else {
             cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
-            if (cpl_start < 0)
-                s->cpl_enabled = 0;
+            if (cpl_start < 0) {
+                if (s->options.channel_coupling == AC3ENC_OPT_AUTO)
+                    s->cpl_enabled = 0;
+                else
+                    cpl_start = 15;
+            }
         }
     }
     if (s->cpl_enabled) {
@@ -2592,53 +2315,49 @@ static av_cold void set_bandwidth(AC3EncodeContext *s)
 
         s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
         s->cpl_end_freq       = cpl_end_band   * 12 + 37;
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
+        for (blk = 0; blk < s->num_blocks; blk++)
             s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
     }
 }
 
 
-static av_cold int allocate_buffers(AVCodecContext *avctx)
+static av_cold int allocate_buffers(AC3EncodeContext *s)
 {
+    AVCodecContext *avctx = s->avctx;
     int blk, ch;
-    AC3EncodeContext *s = avctx->priv_data;
     int channels = s->channels + 1; /* includes coupling channel */
-
-    FF_ALLOC_OR_GOTO(avctx, s->planar_samples, s->channels * sizeof(*s->planar_samples),
-                     alloc_fail);
-    for (ch = 0; ch < s->channels; ch++) {
-        FF_ALLOCZ_OR_GOTO(avctx, s->planar_samples[ch],
-                          (AC3_FRAME_SIZE+AC3_BLOCK_SIZE) * sizeof(**s->planar_samples),
-                          alloc_fail);
-    }
-    FF_ALLOC_OR_GOTO(avctx, s->bap_buffer,  AC3_MAX_BLOCKS * channels *
-                     AC3_MAX_COEFS * sizeof(*s->bap_buffer),  alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, AC3_MAX_BLOCKS * channels *
-                     AC3_MAX_COEFS * sizeof(*s->bap1_buffer), alloc_fail);
-    FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, AC3_MAX_BLOCKS * channels *
-                      AC3_MAX_COEFS * sizeof(*s->mdct_coef_buffer), alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, AC3_MAX_BLOCKS * channels *
-                     AC3_MAX_COEFS * sizeof(*s->exp_buffer), alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, AC3_MAX_BLOCKS * channels *
-                     128 * sizeof(*s->grouped_exp_buffer), alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, AC3_MAX_BLOCKS * channels *
-                     AC3_MAX_COEFS * sizeof(*s->psd_buffer), alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, AC3_MAX_BLOCKS * channels *
-                     64 * sizeof(*s->band_psd_buffer), alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, AC3_MAX_BLOCKS * channels *
-                     64 * sizeof(*s->mask_buffer), alloc_fail);
-    FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, AC3_MAX_BLOCKS * channels *
-                     AC3_MAX_COEFS * sizeof(*s->qmant_buffer), alloc_fail);
+    int channel_blocks = channels * s->num_blocks;
+    int total_coefs    = AC3_MAX_COEFS * channel_blocks;
+
+    if (s->allocate_sample_buffers(s))
+        goto alloc_fail;
+
+    FF_ALLOC_OR_GOTO(avctx, s->bap_buffer, total_coefs *
+                     sizeof(*s->bap_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, total_coefs *
+                     sizeof(*s->bap1_buffer), alloc_fail);
+    FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, total_coefs *
+                      sizeof(*s->mdct_coef_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, total_coefs *
+                     sizeof(*s->exp_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, channel_blocks * 128 *
+                     sizeof(*s->grouped_exp_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, total_coefs *
+                     sizeof(*s->psd_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, channel_blocks * 64 *
+                     sizeof(*s->band_psd_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, channel_blocks * 64 *
+                     sizeof(*s->mask_buffer), alloc_fail);
+    FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, total_coefs *
+                     sizeof(*s->qmant_buffer), alloc_fail);
     if (s->cpl_enabled) {
-        FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, AC3_MAX_BLOCKS * channels *
-                         16 * sizeof(*s->cpl_coord_exp_buffer), alloc_fail);
-        FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, AC3_MAX_BLOCKS * channels *
-                         16 * sizeof(*s->cpl_coord_mant_buffer), alloc_fail);
+        FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, channel_blocks * 16 *
+                         sizeof(*s->cpl_coord_exp_buffer), alloc_fail);
+        FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, channel_blocks * 16 *
+                         sizeof(*s->cpl_coord_mant_buffer), alloc_fail);
     }
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    for (blk = 0; blk < s->num_blocks; blk++) {
         AC3Block *block = &s->blocks[blk];
-        FF_ALLOC_OR_GOTO(avctx, block->bap, channels * sizeof(*block->bap),
-                         alloc_fail);
         FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef),
                           alloc_fail);
         FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp),
@@ -2662,7 +2381,6 @@ static av_cold int allocate_buffers(AVCodecContext *avctx)
 
         for (ch = 0; ch < channels; ch++) {
             /* arrangement: block, channel, coeff */
-            block->bap[ch]         = &s->bap_buffer        [AC3_MAX_COEFS * (blk * channels + ch)];
             block->grouped_exp[ch] = &s->grouped_exp_buffer[128           * (blk * channels + ch)];
             block->psd[ch]         = &s->psd_buffer        [AC3_MAX_COEFS * (blk * channels + ch)];
             block->band_psd[ch]    = &s->band_psd_buffer   [64            * (blk * channels + ch)];
@@ -2674,23 +2392,23 @@ static av_cold int allocate_buffers(AVCodecContext *avctx)
             }
 
             /* arrangement: channel, block, coeff */
-            block->exp[ch]         = &s->exp_buffer        [AC3_MAX_COEFS * (AC3_MAX_BLOCKS * ch + blk)];
-            block->mdct_coef[ch]   = &s->mdct_coef_buffer  [AC3_MAX_COEFS * (AC3_MAX_BLOCKS * ch + blk)];
+            block->exp[ch]         = &s->exp_buffer        [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
+            block->mdct_coef[ch]   = &s->mdct_coef_buffer  [AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
         }
     }
 
-    if (CONFIG_AC3ENC_FLOAT) {
-        FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, AC3_MAX_BLOCKS * channels *
-                          AC3_MAX_COEFS * sizeof(*s->fixed_coef_buffer), alloc_fail);
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+    if (!s->fixed_point) {
+        FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, total_coefs *
+                          sizeof(*s->fixed_coef_buffer), alloc_fail);
+        for (blk = 0; blk < s->num_blocks; blk++) {
             AC3Block *block = &s->blocks[blk];
             FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels *
                               sizeof(*block->fixed_coef), alloc_fail);
             for (ch = 0; ch < channels; ch++)
-                block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (AC3_MAX_BLOCKS * ch + blk)];
+                block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (s->num_blocks * ch + blk)];
         }
     } else {
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+        for (blk = 0; blk < s->num_blocks; blk++) {
             AC3Block *block = &s->blocks[blk];
             FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels *
                               sizeof(*block->fixed_coef), alloc_fail);
@@ -2705,30 +2423,30 @@ alloc_fail:
 }
 
 
-/**
- * Initialize the encoder.
- */
-static av_cold int ac3_encode_init(AVCodecContext *avctx)
+av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
 {
     AC3EncodeContext *s = avctx->priv_data;
     int ret, frame_size_58;
 
-    avctx->frame_size = AC3_FRAME_SIZE;
+    s->avctx = avctx;
+
+    s->eac3 = avctx->codec_id == AV_CODEC_ID_EAC3;
 
     ff_ac3_common_init();
 
-    ret = validate_options(avctx, s);
+    ret = validate_options(s);
     if (ret)
         return ret;
 
+    avctx->frame_size = AC3_BLOCK_SIZE * s->num_blocks;
+    avctx->delay      = AC3_BLOCK_SIZE;
+
     s->bitstream_mode = avctx->audio_service_type;
     if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
         s->bitstream_mode = 0x7;
 
-    s->frame_size_min  = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
     s->bits_written    = 0;
     s->samples_written = 0;
-    s->frame_size      = s->frame_size_min;
 
     /* calculate crc_inv for both possible frame sizes */
     frame_size_58 = (( s->frame_size    >> 2) + ( s->frame_size    >> 4)) << 1;
@@ -2738,29 +2456,51 @@ static av_cold int ac3_encode_init(AVCodecContext *avctx)
         s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
     }
 
+    /* set function pointers */
+    if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) {
+        s->mdct_end                     = ff_ac3_fixed_mdct_end;
+        s->mdct_init                    = ff_ac3_fixed_mdct_init;
+        s->allocate_sample_buffers      = ff_ac3_fixed_allocate_sample_buffers;
+    } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) {
+        s->mdct_end                     = ff_ac3_float_mdct_end;
+        s->mdct_init                    = ff_ac3_float_mdct_init;
+        s->allocate_sample_buffers      = ff_ac3_float_allocate_sample_buffers;
+    }
+    if (CONFIG_EAC3_ENCODER && s->eac3)
+        s->output_frame_header = ff_eac3_output_frame_header;
+    else
+        s->output_frame_header = ac3_output_frame_header;
+
     set_bandwidth(s);
 
     exponent_init(s);
 
     bit_alloc_init(s);
 
-    ret = mdct_init(avctx, &s->mdct, 9);
+    ret = s->mdct_init(s);
     if (ret)
         goto init_fail;
 
-    ret = allocate_buffers(avctx);
+    ret = allocate_buffers(s);
     if (ret)
         goto init_fail;
 
+#if FF_API_OLD_ENCODE_AUDIO
     avctx->coded_frame= avcodec_alloc_frame();
+    if (!avctx->coded_frame) {
+        ret = AVERROR(ENOMEM);
+        goto init_fail;
+    }
+#endif
 
-    dsputil_init(&s->dsp, avctx);
+    ff_dsputil_init(&s->dsp, avctx);
+    avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
     ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT);
 
-    dprint_options(avctx);
+    dprint_options(s);
 
     return 0;
 init_fail:
-    ac3_encode_close(avctx);
+    ff_ac3_encode_close(avctx);
     return ret;
 }