Move E-AC-3 encoder functions to a separate eac3enc.c file.
authorJustin Ruggles <justin.ruggles@gmail.com>
Tue, 7 Jun 2011 16:47:09 +0000 (12:47 -0400)
committerJustin Ruggles <justin.ruggles@gmail.com>
Tue, 7 Jun 2011 19:16:41 +0000 (15:16 -0400)
libavcodec/Makefile
libavcodec/ac3enc.c
libavcodec/ac3enc.h [new file with mode: 0644]
libavcodec/eac3enc.c [new file with mode: 0644]
libavcodec/eac3enc.h [new file with mode: 0644]

index b772bf1..7fd6b49 100644 (file)
@@ -124,7 +124,8 @@ OBJS-$(CONFIG_DVVIDEO_DECODER)         += dv.o dvdata.o
 OBJS-$(CONFIG_DVVIDEO_ENCODER)         += dv.o dvdata.o
 OBJS-$(CONFIG_DXA_DECODER)             += dxa.o
 OBJS-$(CONFIG_EAC3_DECODER)            += eac3dec.o eac3dec_data.o
-OBJS-$(CONFIG_EAC3_ENCODER)            += ac3enc_float.o ac3tab.o ac3.o kbdwin.o
+OBJS-$(CONFIG_EAC3_ENCODER)            += eac3enc.o ac3enc_float.o ac3tab.o \
+                                          ac3.o kbdwin.o
 OBJS-$(CONFIG_EACMV_DECODER)           += eacmv.o
 OBJS-$(CONFIG_EAMAD_DECODER)           += eamad.o eaidct.o mpeg12.o \
                                           mpeg12data.o mpegvideo.o  \
index 1ab0c62..9e011af 100644 (file)
 #include "ac3.h"
 #include "audioconvert.h"
 #include "fft.h"
-
-
-#ifndef CONFIG_AC3ENC_FLOAT
-#define CONFIG_AC3ENC_FLOAT 0
-#endif
-
-
-#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 {
-    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
-    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 eac3;                               ///< indicates if this is E-AC-3 vs. AC-3
-    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];
-    int64_t bits_written;                   ///< bit count    (used to avg. bitrate)
-    int64_t 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
-    uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
-    uint8_t *ref_bap     [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
-    int ref_bap_set;                                         ///< indicates if ref_bap pointers have been set
-
-    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
@@ -741,34 +566,8 @@ static void apply_channel_coupling(AC3EncodeContext *s)
         }
     }
 
-    if (s->eac3) {
-        /* set first cpl coords */
-        int first_cpl_coords[AC3_MAX_CHANNELS];
-        for (ch = 1; ch <= s->fbw_channels; ch++)
-            first_cpl_coords[ch] = 1;
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-            AC3Block *block = &s->blocks[blk];
-            for (ch = 1; ch <= s->fbw_channels; ch++) {
-                if (block->channel_in_cpl[ch]) {
-                    if (first_cpl_coords[ch]) {
-                        block->new_cpl_coords = 2;
-                        first_cpl_coords[ch]  = 0;
-                    }
-                } else {
-                    first_cpl_coords[ch] = 1;
-                }
-            }
-        }
-
-        /* set first cpl leak */
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
-            AC3Block *block = &s->blocks[blk];
-            if (block->cpl_in_use) {
-                block->new_cpl_leak = 2;
-                break;
-            }
-        }
-    }
+    if (s->eac3)
+        ff_eac3_set_cpl_states(s);
 #endif /* CONFIG_AC3ENC_FLOAT */
 }
 
@@ -1906,79 +1705,6 @@ static void ac3_output_frame_header(AC3EncodeContext *s)
 
 
 /**
- * Write the E-AC-3 frame header to the output bitstream.
- */
-static void eac3_output_frame_header(AC3EncodeContext *s)
-{
-    int blk, ch;
-    AC3EncOptions *opt = &s->options;
-
-    put_bits(&s->pb, 16, 0x0b77);                   /* sync word */
-
-    /* BSI header */
-    put_bits(&s->pb,  2, 0);                        /* stream type = independent */
-    put_bits(&s->pb,  3, 0);                        /* substream id = 0 */
-    put_bits(&s->pb, 11, (s->frame_size / 2) - 1);  /* frame size */
-    if (s->bit_alloc.sr_shift) {
-        put_bits(&s->pb, 2, 0x3);                   /* fscod2 */
-        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
-    } else {
-        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
-        put_bits(&s->pb, 2, 0x3);                   /* number of blocks = 6 */
-    }
-    put_bits(&s->pb, 3, s->channel_mode);           /* audio coding mode */
-    put_bits(&s->pb, 1, s->lfe_on);                 /* LFE channel indicator */
-    put_bits(&s->pb, 5, s->bitstream_id);           /* bitstream id (EAC3=16) */
-    put_bits(&s->pb, 5, -opt->dialogue_level);      /* dialogue normalization level */
-    put_bits(&s->pb, 1, 0);                         /* no compression gain */
-    put_bits(&s->pb, 1, 0);                         /* no mixing metadata */
-    /* TODO: mixing metadata */
-    put_bits(&s->pb, 1, 0);                         /* no info metadata */
-    /* TODO: info metadata */
-    put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */
-
-    /* frame header */
-    put_bits(&s->pb, 1, 1);                         /* exponent strategy syntax = each block */
-    put_bits(&s->pb, 1, 0);                         /* aht enabled = no */
-    put_bits(&s->pb, 2, 0);                         /* snr offset strategy = 1 */
-    put_bits(&s->pb, 1, 0);                         /* transient pre-noise processing enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* block switch syntax enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* dither flag syntax enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* bit allocation model syntax enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* fast gain codes enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* dba syntax enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* skip field syntax enabled = no */
-    put_bits(&s->pb, 1, 0);                         /* spx enabled = no */
-    /* coupling strategy use flags */
-    if (s->channel_mode > AC3_CHMODE_MONO) {
-        put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
-        for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) {
-            AC3Block *block = &s->blocks[blk];
-            put_bits(&s->pb, 1, block->new_cpl_strategy);
-            if (block->new_cpl_strategy)
-                put_bits(&s->pb, 1, block->cpl_in_use);
-        }
-    }
-    /* exponent strategy */
-    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
-        for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
-            put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
-    if (s->lfe_on) {
-        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
-            put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
-    }
-    /* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */
-    for (ch = 1; ch <= s->fbw_channels; ch++)
-        put_bits(&s->pb, 5, 0);
-    /* snr offsets */
-    put_bits(&s->pb, 6, s->coarse_snr_offset);
-    put_bits(&s->pb, 4, s->fine_snr_offset[1]);
-    /* block start info */
-    put_bits(&s->pb, 1, 0);
-}
-
-
-/**
  * Write one audio block to the output bitstream.
  */
 static void output_audio_block(AC3EncodeContext *s, int blk)
@@ -2262,7 +1988,7 @@ static void output_frame(AC3EncodeContext *s, unsigned char *frame)
     init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE);
 
     if (s->eac3)
-        eac3_output_frame_header(s);
+        ff_eac3_output_frame_header(s);
     else
         ac3_output_frame_header(s);
 
diff --git a/libavcodec/ac3enc.h b/libavcodec/ac3enc.h
new file mode 100644 (file)
index 0000000..0541683
--- /dev/null
@@ -0,0 +1,214 @@
+/*
+ * AC-3 encoder & E-AC-3 encoder common header
+ * Copyright (c) 2000 Fabrice Bellard
+ * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * AC-3 encoder & E-AC-3 encoder common header
+ */
+
+#ifndef AVCODEC_AC3ENC_H
+#define AVCODEC_AC3ENC_H
+
+#include <stdint.h>
+#include "ac3.h"
+#include "ac3dsp.h"
+#include "avcodec.h"
+#include "dsputil.h"
+#include "put_bits.h"
+#include "fft.h"
+
+#ifndef CONFIG_AC3ENC_FLOAT
+#define CONFIG_AC3ENC_FLOAT 0
+#endif
+
+#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 {
+    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
+    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 eac3;                               ///< indicates if this is E-AC-3 vs. AC-3
+    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];
+    int64_t bits_written;                   ///< bit count    (used to avg. bitrate)
+    int64_t 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
+    uint8_t exp_ref_block[AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< reference blocks for EXP_REUSE
+    uint8_t *ref_bap     [AC3_MAX_CHANNELS][AC3_MAX_BLOCKS]; ///< bit allocation pointers (bap)
+    int ref_bap_set;                                         ///< indicates if ref_bap pointers have been set
+
+    DECLARE_ALIGNED(32, SampleType, windowed_samples)[AC3_WINDOW_SIZE];
+} AC3EncodeContext;
+
+#endif /* AVCODEC_AC3ENC_H */
diff --git a/libavcodec/eac3enc.c b/libavcodec/eac3enc.c
new file mode 100644 (file)
index 0000000..20f4b87
--- /dev/null
@@ -0,0 +1,131 @@
+/*
+ * E-AC-3 encoder
+ * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * E-AC-3 encoder
+ */
+
+#define CONFIG_AC3ENC_FLOAT 1
+#include "ac3enc.h"
+#include "eac3enc.h"
+
+void ff_eac3_set_cpl_states(AC3EncodeContext *s)
+{
+    int ch, blk;
+    int first_cpl_coords[AC3_MAX_CHANNELS];
+
+    /* set first cpl coords */
+    for (ch = 1; ch <= s->fbw_channels; ch++)
+        first_cpl_coords[ch] = 1;
+    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+        AC3Block *block = &s->blocks[blk];
+        for (ch = 1; ch <= s->fbw_channels; ch++) {
+            if (block->channel_in_cpl[ch]) {
+                if (first_cpl_coords[ch]) {
+                    block->new_cpl_coords = 2;
+                    first_cpl_coords[ch]  = 0;
+                }
+            } else {
+                first_cpl_coords[ch] = 1;
+            }
+        }
+    }
+
+    /* set first cpl leak */
+    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
+        AC3Block *block = &s->blocks[blk];
+        if (block->cpl_in_use) {
+            block->new_cpl_leak = 2;
+            break;
+        }
+    }
+}
+
+
+void ff_eac3_output_frame_header(AC3EncodeContext *s)
+{
+    int blk, ch;
+    AC3EncOptions *opt = &s->options;
+
+    put_bits(&s->pb, 16, 0x0b77);                   /* sync word */
+
+    /* BSI header */
+    put_bits(&s->pb,  2, 0);                        /* stream type = independent */
+    put_bits(&s->pb,  3, 0);                        /* substream id = 0 */
+    put_bits(&s->pb, 11, (s->frame_size / 2) - 1);  /* frame size */
+    if (s->bit_alloc.sr_shift) {
+        put_bits(&s->pb, 2, 0x3);                   /* fscod2 */
+        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
+    } else {
+        put_bits(&s->pb, 2, s->bit_alloc.sr_code);  /* sample rate code */
+        put_bits(&s->pb, 2, 0x3);                   /* number of blocks = 6 */
+    }
+    put_bits(&s->pb, 3, s->channel_mode);           /* audio coding mode */
+    put_bits(&s->pb, 1, s->lfe_on);                 /* LFE channel indicator */
+    put_bits(&s->pb, 5, s->bitstream_id);           /* bitstream id (EAC3=16) */
+    put_bits(&s->pb, 5, -opt->dialogue_level);      /* dialogue normalization level */
+    put_bits(&s->pb, 1, 0);                         /* no compression gain */
+    put_bits(&s->pb, 1, 0);                         /* no mixing metadata */
+    /* TODO: mixing metadata */
+    put_bits(&s->pb, 1, 0);                         /* no info metadata */
+    /* TODO: info metadata */
+    put_bits(&s->pb, 1, 0);                         /* no additional bit stream info */
+
+    /* frame header */
+    put_bits(&s->pb, 1, 1);                         /* exponent strategy syntax = each block */
+    put_bits(&s->pb, 1, 0);                         /* aht enabled = no */
+    put_bits(&s->pb, 2, 0);                         /* snr offset strategy = 1 */
+    put_bits(&s->pb, 1, 0);                         /* transient pre-noise processing enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* block switch syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* dither flag syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* bit allocation model syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* fast gain codes enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* dba syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* skip field syntax enabled = no */
+    put_bits(&s->pb, 1, 0);                         /* spx enabled = no */
+    /* coupling strategy use flags */
+    if (s->channel_mode > AC3_CHMODE_MONO) {
+        put_bits(&s->pb, 1, s->blocks[0].cpl_in_use);
+        for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) {
+            AC3Block *block = &s->blocks[blk];
+            put_bits(&s->pb, 1, block->new_cpl_strategy);
+            if (block->new_cpl_strategy)
+                put_bits(&s->pb, 1, block->cpl_in_use);
+        }
+    }
+    /* exponent strategy */
+    for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
+        for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++)
+            put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
+    if (s->lfe_on) {
+        for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
+            put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
+    }
+    /* E-AC-3 to AC-3 converter exponent strategy (unfortunately not optional...) */
+    for (ch = 1; ch <= s->fbw_channels; ch++)
+        put_bits(&s->pb, 5, 0);
+    /* snr offsets */
+    put_bits(&s->pb, 6, s->coarse_snr_offset);
+    put_bits(&s->pb, 4, s->fine_snr_offset[1]);
+    /* block start info */
+    put_bits(&s->pb, 1, 0);
+}
diff --git a/libavcodec/eac3enc.h b/libavcodec/eac3enc.h
new file mode 100644 (file)
index 0000000..eacb8cf
--- /dev/null
@@ -0,0 +1,44 @@
+/*
+ * E-AC-3 encoder
+ * Copyright (c) 2011 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * E-AC-3 encoder
+ */
+
+#ifndef AVCODEC_EAC3ENC_H
+#define AVCODEC_EAC3ENC_H
+
+#include "ac3enc.h"
+
+/**
+ * Set coupling states.
+ * This determines whether certain flags must be written to the bitstream or
+ * whether they will be implicitly already known by the decoder.
+ */
+void ff_eac3_set_cpl_states(AC3EncodeContext *s);
+
+/**
+ * Write the E-AC-3 frame header to the output bitstream.
+ */
+void ff_eac3_output_frame_header(AC3EncodeContext *s);
+
+#endif /* AVCODEC_EAC3ENC_H */