vp9: assert -> av_assert and fix associated compile error.
[ffmpeg.git] / libavcodec / aacsbr.c
index aa728f6..1d2a8d4 100644 (file)
  * AAC Spectral Band Replication decoding functions
  * @author Robert Swain ( rob opendot cl )
  */
+#define USE_FIXED 0
 
 #include "aac.h"
 #include "sbr.h"
 #include "aacsbr.h"
 #include "aacsbrdata.h"
+#include "aacsbr_tablegen.h"
 #include "fft.h"
+#include "internal.h"
 #include "aacps.h"
 #include "sbrdsp.h"
 #include "libavutil/internal.h"
 #include <float.h>
 #include <math.h>
 
-#define ENVELOPE_ADJUSTMENT_OFFSET 2
-#define NOISE_FLOOR_OFFSET 6.0f
-
 #if ARCH_MIPS
 #include "mips/aacsbr_mips.h"
 #endif /* ARCH_MIPS */
 
-/**
- * SBR VLC tables
- */
-enum {
-    T_HUFFMAN_ENV_1_5DB,
-    F_HUFFMAN_ENV_1_5DB,
-    T_HUFFMAN_ENV_BAL_1_5DB,
-    F_HUFFMAN_ENV_BAL_1_5DB,
-    T_HUFFMAN_ENV_3_0DB,
-    F_HUFFMAN_ENV_3_0DB,
-    T_HUFFMAN_ENV_BAL_3_0DB,
-    F_HUFFMAN_ENV_BAL_3_0DB,
-    T_HUFFMAN_NOISE_3_0DB,
-    T_HUFFMAN_NOISE_BAL_3_0DB,
-};
-
-/**
- * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
- */
-enum {
-    FIXFIX,
-    FIXVAR,
-    VARFIX,
-    VARVAR,
-};
-
-enum {
-    EXTENSION_ID_PS = 2,
-};
-
 static VLC vlc_sbr[10];
-static const int8_t vlc_sbr_lav[10] =
-    { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
-
-#define SBR_INIT_VLC_STATIC(num, size) \
-    INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size,     \
-                    sbr_tmp[num].sbr_bits ,                      1,                      1, \
-                    sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
-                    size)
-
-#define SBR_VLC_ROW(name) \
-    { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
-
 static void aacsbr_func_ptr_init(AACSBRContext *c);
 
-av_cold void ff_aac_sbr_init(void)
-{
-    int n;
-    static const struct {
-        const void *sbr_codes, *sbr_bits;
-        const unsigned int table_size, elem_size;
-    } sbr_tmp[] = {
-        SBR_VLC_ROW(t_huffman_env_1_5dB),
-        SBR_VLC_ROW(f_huffman_env_1_5dB),
-        SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
-        SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
-        SBR_VLC_ROW(t_huffman_env_3_0dB),
-        SBR_VLC_ROW(f_huffman_env_3_0dB),
-        SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
-        SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
-        SBR_VLC_ROW(t_huffman_noise_3_0dB),
-        SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
-    };
-
-    // SBR VLC table initialization
-    SBR_INIT_VLC_STATIC(0, 1098);
-    SBR_INIT_VLC_STATIC(1, 1092);
-    SBR_INIT_VLC_STATIC(2, 768);
-    SBR_INIT_VLC_STATIC(3, 1026);
-    SBR_INIT_VLC_STATIC(4, 1058);
-    SBR_INIT_VLC_STATIC(5, 1052);
-    SBR_INIT_VLC_STATIC(6, 544);
-    SBR_INIT_VLC_STATIC(7, 544);
-    SBR_INIT_VLC_STATIC(8, 592);
-    SBR_INIT_VLC_STATIC(9, 512);
-
-    for (n = 1; n < 320; n++)
-        sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
-    sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
-    sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
-
-    for (n = 0; n < 320; n++)
-        sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
-
-    ff_ps_init();
-}
-
-/** Places SBR in pure upsampling mode. */
-static void sbr_turnoff(SpectralBandReplication *sbr) {
-    sbr->start = 0;
-    // Init defults used in pure upsampling mode
-    sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
-    sbr->m[1] = 0;
-    // Reset values for first SBR header
-    sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
-    memset(&sbr->spectrum_params, -1, sizeof(SpectrumParameters));
-}
-
-av_cold void ff_aac_sbr_ctx_init(AACContext *ac, SpectralBandReplication *sbr)
-{
-    if(sbr->mdct.mdct_bits)
-        return;
-    sbr->kx[0] = sbr->kx[1];
-    sbr_turnoff(sbr);
-    sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
-    sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
-    /* SBR requires samples to be scaled to +/-32768.0 to work correctly.
-     * mdct scale factors are adjusted to scale up from +/-1.0 at analysis
-     * and scale back down at synthesis. */
-    ff_mdct_init(&sbr->mdct,     7, 1, 1.0 / (64 * 32768.0));
-    ff_mdct_init(&sbr->mdct_ana, 7, 1, -2.0 * 32768.0);
-    ff_ps_ctx_init(&sbr->ps);
-    ff_sbrdsp_init(&sbr->dsp);
-    aacsbr_func_ptr_init(&sbr->c);
-}
-
-av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
-{
-    ff_mdct_end(&sbr->mdct);
-    ff_mdct_end(&sbr->mdct_ana);
-}
-
-static int qsort_comparison_function_int16(const void *a, const void *b)
-{
-    return *(const int16_t *)a - *(const int16_t *)b;
-}
-
-static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
-{
-    int i;
-    for (i = 0; i <= last_el; i++)
-        if (table[i] == needle)
-            return 1;
-    return 0;
-}
-
-/// Limiter Frequency Band Table (14496-3 sp04 p198)
-static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
-{
-    int k;
-    if (sbr->bs_limiter_bands > 0) {
-        static const float bands_warped[3] = { 1.32715174233856803909f,   //2^(0.49/1.2)
-                                               1.18509277094158210129f,   //2^(0.49/2)
-                                               1.11987160404675912501f }; //2^(0.49/3)
-        const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
-        int16_t patch_borders[7];
-        uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
-
-        patch_borders[0] = sbr->kx[1];
-        for (k = 1; k <= sbr->num_patches; k++)
-            patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
-
-        memcpy(sbr->f_tablelim, sbr->f_tablelow,
-               (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
-        if (sbr->num_patches > 1)
-            memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
-                   (sbr->num_patches - 1) * sizeof(patch_borders[0]));
-
-        qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
-              sizeof(sbr->f_tablelim[0]),
-              qsort_comparison_function_int16);
-
-        sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
-        while (out < sbr->f_tablelim + sbr->n_lim) {
-            if (*in >= *out * lim_bands_per_octave_warped) {
-                *++out = *in++;
-            } else if (*in == *out ||
-                !in_table_int16(patch_borders, sbr->num_patches, *in)) {
-                in++;
-                sbr->n_lim--;
-            } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
-                *out = *in++;
-                sbr->n_lim--;
-            } else {
-                *++out = *in++;
-            }
-        }
-    } else {
-        sbr->f_tablelim[0] = sbr->f_tablelow[0];
-        sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
-        sbr->n_lim = 1;
-    }
-}
-
-static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
-{
-    unsigned int cnt = get_bits_count(gb);
-    uint8_t bs_header_extra_1;
-    uint8_t bs_header_extra_2;
-    int old_bs_limiter_bands = sbr->bs_limiter_bands;
-    SpectrumParameters old_spectrum_params;
-
-    sbr->start = 1;
-
-    // Save last spectrum parameters variables to compare to new ones
-    memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
-
-    sbr->bs_amp_res_header              = get_bits1(gb);
-    sbr->spectrum_params.bs_start_freq  = get_bits(gb, 4);
-    sbr->spectrum_params.bs_stop_freq   = get_bits(gb, 4);
-    sbr->spectrum_params.bs_xover_band  = get_bits(gb, 3);
-                                          skip_bits(gb, 2); // bs_reserved
-
-    bs_header_extra_1 = get_bits1(gb);
-    bs_header_extra_2 = get_bits1(gb);
-
-    if (bs_header_extra_1) {
-        sbr->spectrum_params.bs_freq_scale  = get_bits(gb, 2);
-        sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
-        sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
-    } else {
-        sbr->spectrum_params.bs_freq_scale  = 2;
-        sbr->spectrum_params.bs_alter_scale = 1;
-        sbr->spectrum_params.bs_noise_bands = 2;
-    }
-
-    // Check if spectrum parameters changed
-    if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
-        sbr->reset = 1;
-
-    if (bs_header_extra_2) {
-        sbr->bs_limiter_bands  = get_bits(gb, 2);
-        sbr->bs_limiter_gains  = get_bits(gb, 2);
-        sbr->bs_interpol_freq  = get_bits1(gb);
-        sbr->bs_smoothing_mode = get_bits1(gb);
-    } else {
-        sbr->bs_limiter_bands  = 2;
-        sbr->bs_limiter_gains  = 2;
-        sbr->bs_interpol_freq  = 1;
-        sbr->bs_smoothing_mode = 1;
-    }
-
-    if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
-        sbr_make_f_tablelim(sbr);
-
-    return get_bits_count(gb) - cnt;
-}
-
-static int array_min_int16(const int16_t *array, int nel)
-{
-    int i, min = array[0];
-    for (i = 1; i < nel; i++)
-        min = FFMIN(array[i], min);
-    return min;
-}
-
 static void make_bands(int16_t* bands, int start, int stop, int num_bands)
 {
     int k, previous, present;
@@ -312,930 +69,70 @@ static void make_bands(int16_t* bands, int start, int stop, int num_bands)
     bands[num_bands-1] = stop - previous;
 }
 
-static int check_n_master(AVCodecContext *avctx, int n_master, int bs_xover_band)
-{
-    // Requirements (14496-3 sp04 p205)
-    if (n_master <= 0) {
-        av_log(avctx, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
-        return -1;
-    }
-    if (bs_xover_band >= n_master) {
-        av_log(avctx, AV_LOG_ERROR,
-               "Invalid bitstream, crossover band index beyond array bounds: %d\n",
-               bs_xover_band);
-        return -1;
-    }
-    return 0;
-}
-
-/// Master Frequency Band Table (14496-3 sp04 p194)
-static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
-                             SpectrumParameters *spectrum)
-{
-    unsigned int temp, max_qmf_subbands;
-    unsigned int start_min, stop_min;
-    int k;
-    const int8_t *sbr_offset_ptr;
-    int16_t stop_dk[13];
-
-    if (sbr->sample_rate < 32000) {
-        temp = 3000;
-    } else if (sbr->sample_rate < 64000) {
-        temp = 4000;
-    } else
-        temp = 5000;
-
-    switch (sbr->sample_rate) {
-    case 16000:
-        sbr_offset_ptr = sbr_offset[0];
-        break;
-    case 22050:
-        sbr_offset_ptr = sbr_offset[1];
-        break;
-    case 24000:
-        sbr_offset_ptr = sbr_offset[2];
-        break;
-    case 32000:
-        sbr_offset_ptr = sbr_offset[3];
-        break;
-    case 44100: case 48000: case 64000:
-        sbr_offset_ptr = sbr_offset[4];
-        break;
-    case 88200: case 96000: case 128000: case 176400: case 192000:
-        sbr_offset_ptr = sbr_offset[5];
-        break;
-    default:
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
-        return -1;
-    }
-
-    start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
-    stop_min  = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
-
-    sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
-
-    if (spectrum->bs_stop_freq < 14) {
-        sbr->k[2] = stop_min;
-        make_bands(stop_dk, stop_min, 64, 13);
-        qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
-        for (k = 0; k < spectrum->bs_stop_freq; k++)
-            sbr->k[2] += stop_dk[k];
-    } else if (spectrum->bs_stop_freq == 14) {
-        sbr->k[2] = 2*sbr->k[0];
-    } else if (spectrum->bs_stop_freq == 15) {
-        sbr->k[2] = 3*sbr->k[0];
-    } else {
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
-        return -1;
-    }
-    sbr->k[2] = FFMIN(64, sbr->k[2]);
-
-    // Requirements (14496-3 sp04 p205)
-    if (sbr->sample_rate <= 32000) {
-        max_qmf_subbands = 48;
-    } else if (sbr->sample_rate == 44100) {
-        max_qmf_subbands = 35;
-    } else if (sbr->sample_rate >= 48000)
-        max_qmf_subbands = 32;
-
-    if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
-        return -1;
-    }
-
-    if (!spectrum->bs_freq_scale) {
-        int dk, k2diff;
-
-        dk = spectrum->bs_alter_scale + 1;
-        sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
-        if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
-            return -1;
-
-        for (k = 1; k <= sbr->n_master; k++)
-            sbr->f_master[k] = dk;
-
-        k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
-        if (k2diff < 0) {
-            sbr->f_master[1]--;
-            sbr->f_master[2]-= (k2diff < -1);
-        } else if (k2diff) {
-            sbr->f_master[sbr->n_master]++;
-        }
-
-        sbr->f_master[0] = sbr->k[0];
-        for (k = 1; k <= sbr->n_master; k++)
-            sbr->f_master[k] += sbr->f_master[k - 1];
-
-    } else {
-        int half_bands = 7 - spectrum->bs_freq_scale;      // bs_freq_scale  = {1,2,3}
-        int two_regions, num_bands_0;
-        int vdk0_max, vdk1_min;
-        int16_t vk0[49];
-
-        if (49 * sbr->k[2] > 110 * sbr->k[0]) {
-            two_regions = 1;
-            sbr->k[1] = 2 * sbr->k[0];
-        } else {
-            two_regions = 0;
-            sbr->k[1] = sbr->k[2];
-        }
-
-        num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
-
-        if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
-            av_log(ac->avctx, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
-            return -1;
-        }
-
-        vk0[0] = 0;
-
-        make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
-
-        qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
-        vdk0_max = vk0[num_bands_0];
-
-        vk0[0] = sbr->k[0];
-        for (k = 1; k <= num_bands_0; k++) {
-            if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
-                av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
-                return -1;
-            }
-            vk0[k] += vk0[k-1];
-        }
-
-        if (two_regions) {
-            int16_t vk1[49];
-            float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
-                                                     : 1.0f; // bs_alter_scale = {0,1}
-            int num_bands_1 = lrintf(half_bands * invwarp *
-                                     log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
-
-            make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
-
-            vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
-
-            if (vdk1_min < vdk0_max) {
-                int change;
-                qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
-                change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
-                vk1[1]           += change;
-                vk1[num_bands_1] -= change;
-            }
-
-            qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
-
-            vk1[0] = sbr->k[1];
-            for (k = 1; k <= num_bands_1; k++) {
-                if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
-                    av_log(ac->avctx, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
-                    return -1;
-                }
-                vk1[k] += vk1[k-1];
-            }
-
-            sbr->n_master = num_bands_0 + num_bands_1;
-            if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
-                return -1;
-            memcpy(&sbr->f_master[0],               vk0,
-                   (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
-            memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
-                    num_bands_1      * sizeof(sbr->f_master[0]));
-
-        } else {
-            sbr->n_master = num_bands_0;
-            if (check_n_master(ac->avctx, sbr->n_master, sbr->spectrum_params.bs_xover_band))
-                return -1;
-            memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
-        }
-    }
-
-    return 0;
-}
-
-/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
-static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
-{
-    int i, k, sb = 0;
-    int msb = sbr->k[0];
-    int usb = sbr->kx[1];
-    int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
-
-    sbr->num_patches = 0;
-
-    if (goal_sb < sbr->kx[1] + sbr->m[1]) {
-        for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
-    } else
-        k = sbr->n_master;
-
-    do {
-        int odd = 0;
-        for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
-            sb = sbr->f_master[i];
-            odd = (sb + sbr->k[0]) & 1;
-        }
-
-        // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5.
-        // After this check the final number of patches can still be six which is
-        // illegal however the Coding Technologies decoder check stream has a final
-        // count of 6 patches
-        if (sbr->num_patches > 5) {
-            av_log(ac->avctx, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
-            return -1;
-        }
-
-        sbr->patch_num_subbands[sbr->num_patches]  = FFMAX(sb - usb, 0);
-        sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
-
-        if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
-            usb = sb;
-            msb = sb;
-            sbr->num_patches++;
-        } else
-            msb = sbr->kx[1];
-
-        if (sbr->f_master[k] - sb < 3)
-            k = sbr->n_master;
-    } while (sb != sbr->kx[1] + sbr->m[1]);
-
-    if (sbr->num_patches > 1 && sbr->patch_num_subbands[sbr->num_patches-1] < 3)
-        sbr->num_patches--;
-
-    return 0;
-}
-
-/// Derived Frequency Band Tables (14496-3 sp04 p197)
-static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
-{
-    int k, temp;
-
-    sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
-    sbr->n[0] = (sbr->n[1] + 1) >> 1;
-
-    memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
-           (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
-    sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
-    sbr->kx[1] = sbr->f_tablehigh[0];
-
-    // Requirements (14496-3 sp04 p205)
-    if (sbr->kx[1] + sbr->m[1] > 64) {
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
-        return -1;
-    }
-    if (sbr->kx[1] > 32) {
-        av_log(ac->avctx, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
-        return -1;
-    }
-
-    sbr->f_tablelow[0] = sbr->f_tablehigh[0];
-    temp = sbr->n[1] & 1;
-    for (k = 1; k <= sbr->n[0]; k++)
-        sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
-
-    sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
-                               log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
-    if (sbr->n_q > 5) {
-        av_log(ac->avctx, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
-        return -1;
-    }
-
-    sbr->f_tablenoise[0] = sbr->f_tablelow[0];
-    temp = 0;
-    for (k = 1; k <= sbr->n_q; k++) {
-        temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
-        sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
-    }
-
-    if (sbr_hf_calc_npatches(ac, sbr) < 0)
-        return -1;
-
-    sbr_make_f_tablelim(sbr);
-
-    sbr->data[0].f_indexnoise = 0;
-    sbr->data[1].f_indexnoise = 0;
-
-    return 0;
-}
-
-static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
-                                              int elements)
-{
-    int i;
-    for (i = 0; i < elements; i++) {
-        vec[i] = get_bits1(gb);
-    }
-}
-
-/** ceil(log2(index+1)) */
-static const int8_t ceil_log2[] = {
-    0, 1, 2, 2, 3, 3,
-};
-
-static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
-                         GetBitContext *gb, SBRData *ch_data)
-{
-    int i;
-    unsigned bs_pointer = 0;
-    // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
-    int abs_bord_trail = 16;
-    int num_rel_lead, num_rel_trail;
-    unsigned bs_num_env_old = ch_data->bs_num_env;
-
-    ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env];
-    ch_data->bs_amp_res = sbr->bs_amp_res_header;
-    ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old];
-
-    switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
-    case FIXFIX:
-        ch_data->bs_num_env                 = 1 << get_bits(gb, 2);
-        num_rel_lead                        = ch_data->bs_num_env - 1;
-        if (ch_data->bs_num_env == 1)
-            ch_data->bs_amp_res = 0;
-
-        if (ch_data->bs_num_env > 4) {
-            av_log(ac->avctx, AV_LOG_ERROR,
-                   "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
-                   ch_data->bs_num_env);
-            return -1;
-        }
-
-        ch_data->t_env[0]                   = 0;
-        ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
-
-        abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) /
-                   ch_data->bs_num_env;
-        for (i = 0; i < num_rel_lead; i++)
-            ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail;
-
-        ch_data->bs_freq_res[1] = get_bits1(gb);
-        for (i = 1; i < ch_data->bs_num_env; i++)
-            ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
-        break;
-    case FIXVAR:
-        abs_bord_trail                     += get_bits(gb, 2);
-        num_rel_trail                       = get_bits(gb, 2);
-        ch_data->bs_num_env                 = num_rel_trail + 1;
-        ch_data->t_env[0]                   = 0;
-        ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
-
-        for (i = 0; i < num_rel_trail; i++)
-            ch_data->t_env[ch_data->bs_num_env - 1 - i] =
-                ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
-
-        bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
-
-        for (i = 0; i < ch_data->bs_num_env; i++)
-            ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb);
-        break;
-    case VARFIX:
-        ch_data->t_env[0]                   = get_bits(gb, 2);
-        num_rel_lead                        = get_bits(gb, 2);
-        ch_data->bs_num_env                 = num_rel_lead + 1;
-        ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
-
-        for (i = 0; i < num_rel_lead; i++)
-            ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
-
-        bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
-
-        get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
-        break;
-    case VARVAR:
-        ch_data->t_env[0]                   = get_bits(gb, 2);
-        abs_bord_trail                     += get_bits(gb, 2);
-        num_rel_lead                        = get_bits(gb, 2);
-        num_rel_trail                       = get_bits(gb, 2);
-        ch_data->bs_num_env                 = num_rel_lead + num_rel_trail + 1;
-
-        if (ch_data->bs_num_env > 5) {
-            av_log(ac->avctx, AV_LOG_ERROR,
-                   "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
-                   ch_data->bs_num_env);
-            return -1;
-        }
-
-        ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail;
-
-        for (i = 0; i < num_rel_lead; i++)
-            ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2;
-        for (i = 0; i < num_rel_trail; i++)
-            ch_data->t_env[ch_data->bs_num_env - 1 - i] =
-                ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2;
-
-        bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]);
-
-        get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env);
-        break;
-    }
-
-    if (bs_pointer > ch_data->bs_num_env + 1) {
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
-               bs_pointer);
-        return -1;
-    }
-
-    for (i = 1; i <= ch_data->bs_num_env; i++) {
-        if (ch_data->t_env[i-1] > ch_data->t_env[i]) {
-            av_log(ac->avctx, AV_LOG_ERROR, "Non monotone time borders\n");
-            return -1;
-        }
-    }
-
-    ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1;
-
-    ch_data->t_q[0]                     = ch_data->t_env[0];
-    ch_data->t_q[ch_data->bs_num_noise] = ch_data->t_env[ch_data->bs_num_env];
-    if (ch_data->bs_num_noise > 1) {
-        unsigned int idx;
-        if (ch_data->bs_frame_class == FIXFIX) {
-            idx = ch_data->bs_num_env >> 1;
-        } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
-            idx = ch_data->bs_num_env - FFMAX((int)bs_pointer - 1, 1);
-        } else { // VARFIX
-            if (!bs_pointer)
-                idx = 1;
-            else if (bs_pointer == 1)
-                idx = ch_data->bs_num_env - 1;
-            else // bs_pointer > 1
-                idx = bs_pointer - 1;
-        }
-        ch_data->t_q[1] = ch_data->t_env[idx];
-    }
-
-    ch_data->e_a[0] = -(ch_data->e_a[1] != bs_num_env_old); // l_APrev
-    ch_data->e_a[1] = -1;
-    if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
-        ch_data->e_a[1] = ch_data->bs_num_env + 1 - bs_pointer;
-    } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
-        ch_data->e_a[1] = bs_pointer - 1;
-
-    return 0;
-}
-
-static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
-    //These variables are saved from the previous frame rather than copied
-    dst->bs_freq_res[0]    = dst->bs_freq_res[dst->bs_num_env];
-    dst->t_env_num_env_old = dst->t_env[dst->bs_num_env];
-    dst->e_a[0]            = -(dst->e_a[1] != dst->bs_num_env);
-
-    //These variables are read from the bitstream and therefore copied
-    memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
-    memcpy(dst->t_env,         src->t_env,         sizeof(dst->t_env));
-    memcpy(dst->t_q,           src->t_q,           sizeof(dst->t_q));
-    dst->bs_num_env        = src->bs_num_env;
-    dst->bs_amp_res        = src->bs_amp_res;
-    dst->bs_num_noise      = src->bs_num_noise;
-    dst->bs_frame_class    = src->bs_frame_class;
-    dst->e_a[1]            = src->e_a[1];
-}
-
-/// Read how the envelope and noise floor data is delta coded
-static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
-                          SBRData *ch_data)
-{
-    get_bits1_vector(gb, ch_data->bs_df_env,   ch_data->bs_num_env);
-    get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
-}
-
-/// Read inverse filtering data
-static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
-                          SBRData *ch_data)
-{
-    int i;
-
-    memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
-    for (i = 0; i < sbr->n_q; i++)
-        ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
-}
-
-static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
-                              SBRData *ch_data, int ch)
-{
-    int bits;
-    int i, j, k;
-    VLC_TYPE (*t_huff)[2], (*f_huff)[2];
-    int t_lav, f_lav;
-    const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
-    const int odd = sbr->n[1] & 1;
-
-    if (sbr->bs_coupling && ch) {
-        if (ch_data->bs_amp_res) {
-            bits   = 5;
-            t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
-            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
-            f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
-            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
-        } else {
-            bits   = 6;
-            t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
-            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
-            f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
-            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
-        }
-    } else {
-        if (ch_data->bs_amp_res) {
-            bits   = 6;
-            t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
-            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
-            f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
-            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
-        } else {
-            bits   = 7;
-            t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
-            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
-            f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
-            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
-        }
-    }
-
-    for (i = 0; i < ch_data->bs_num_env; i++) {
-        if (ch_data->bs_df_env[i]) {
-            // bs_freq_res[0] == bs_freq_res[bs_num_env] from prev frame
-            if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
-                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
-                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
-            } else if (ch_data->bs_freq_res[i + 1]) {
-                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
-                    k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
-                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
-                }
-            } else {
-                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
-                    k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
-                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
-                }
-            }
-        } else {
-            ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
-            for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
-                ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
-        }
-    }
-
-    //assign 0th elements of env_facs from last elements
-    memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env],
-           sizeof(ch_data->env_facs[0]));
-}
-
-static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
-                           SBRData *ch_data, int ch)
-{
-    int i, j;
-    VLC_TYPE (*t_huff)[2], (*f_huff)[2];
-    int t_lav, f_lav;
-    int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
-
-    if (sbr->bs_coupling && ch) {
-        t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
-        t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
-        f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
-        f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
-    } else {
-        t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
-        t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
-        f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
-        f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
-    }
-
-    for (i = 0; i < ch_data->bs_num_noise; i++) {
-        if (ch_data->bs_df_noise[i]) {
-            for (j = 0; j < sbr->n_q; j++)
-                ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
-        } else {
-            ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
-            for (j = 1; j < sbr->n_q; j++)
-                ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
-        }
-    }
-
-    //assign 0th elements of noise_facs from last elements
-    memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
-           sizeof(ch_data->noise_facs[0]));
-}
-
-static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
-                               GetBitContext *gb,
-                               int bs_extension_id, int *num_bits_left)
-{
-    switch (bs_extension_id) {
-    case EXTENSION_ID_PS:
-        if (!ac->oc[1].m4ac.ps) {
-            av_log(ac->avctx, AV_LOG_ERROR, "Parametric Stereo signaled to be not-present but was found in the bitstream.\n");
-            skip_bits_long(gb, *num_bits_left); // bs_fill_bits
-            *num_bits_left = 0;
-        } else {
-#if 1
-            *num_bits_left -= ff_ps_read_data(ac->avctx, gb, &sbr->ps, *num_bits_left);
-#else
-            av_log_missing_feature(ac->avctx, "Parametric Stereo", 0);
-            skip_bits_long(gb, *num_bits_left); // bs_fill_bits
-            *num_bits_left = 0;
-#endif
-        }
-        break;
-    default:
-        // some files contain 0-padding
-        if (bs_extension_id || *num_bits_left > 16 || show_bits(gb, *num_bits_left))
-            av_log_missing_feature(ac->avctx, "Reserved SBR extensions", 1);
-        skip_bits_long(gb, *num_bits_left); // bs_fill_bits
-        *num_bits_left = 0;
-        break;
-    }
-}
-
-static int read_sbr_single_channel_element(AACContext *ac,
-                                            SpectralBandReplication *sbr,
-                                            GetBitContext *gb)
-{
-    if (get_bits1(gb)) // bs_data_extra
-        skip_bits(gb, 4); // bs_reserved
-
-    if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
-        return -1;
-    read_sbr_dtdf(sbr, gb, &sbr->data[0]);
-    read_sbr_invf(sbr, gb, &sbr->data[0]);
-    read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
-    read_sbr_noise(sbr, gb, &sbr->data[0], 0);
-
-    if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
-        get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
-
-    return 0;
-}
-
-static int read_sbr_channel_pair_element(AACContext *ac,
-                                          SpectralBandReplication *sbr,
-                                          GetBitContext *gb)
-{
-    if (get_bits1(gb))    // bs_data_extra
-        skip_bits(gb, 8); // bs_reserved
-
-    if ((sbr->bs_coupling = get_bits1(gb))) {
-        if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
-            return -1;
-        copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
-        read_sbr_dtdf(sbr, gb, &sbr->data[0]);
-        read_sbr_dtdf(sbr, gb, &sbr->data[1]);
-        read_sbr_invf(sbr, gb, &sbr->data[0]);
-        memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
-        memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
-        read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
-        read_sbr_noise(sbr, gb, &sbr->data[0], 0);
-        read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
-        read_sbr_noise(sbr, gb, &sbr->data[1], 1);
-    } else {
-        if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
-            read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
-            return -1;
-        read_sbr_dtdf(sbr, gb, &sbr->data[0]);
-        read_sbr_dtdf(sbr, gb, &sbr->data[1]);
-        read_sbr_invf(sbr, gb, &sbr->data[0]);
-        read_sbr_invf(sbr, gb, &sbr->data[1]);
-        read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
-        read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
-        read_sbr_noise(sbr, gb, &sbr->data[0], 0);
-        read_sbr_noise(sbr, gb, &sbr->data[1], 1);
-    }
-
-    if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
-        get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
-    if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
-        get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
-
-    return 0;
-}
-
-static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
-                                  GetBitContext *gb, int id_aac)
-{
-    unsigned int cnt = get_bits_count(gb);
-
-    if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
-        if (read_sbr_single_channel_element(ac, sbr, gb)) {
-            sbr_turnoff(sbr);
-            return get_bits_count(gb) - cnt;
-        }
-    } else if (id_aac == TYPE_CPE) {
-        if (read_sbr_channel_pair_element(ac, sbr, gb)) {
-            sbr_turnoff(sbr);
-            return get_bits_count(gb) - cnt;
-        }
-    } else {
-        av_log(ac->avctx, AV_LOG_ERROR,
-            "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
-        sbr_turnoff(sbr);
-        return get_bits_count(gb) - cnt;
-    }
-    if (get_bits1(gb)) { // bs_extended_data
-        int num_bits_left = get_bits(gb, 4); // bs_extension_size
-        if (num_bits_left == 15)
-            num_bits_left += get_bits(gb, 8); // bs_esc_count
-
-        num_bits_left <<= 3;
-        while (num_bits_left > 7) {
-            num_bits_left -= 2;
-            read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
-        }
-        if (num_bits_left < 0) {
-            av_log(ac->avctx, AV_LOG_ERROR, "SBR Extension over read.\n");
-        }
-        if (num_bits_left > 0)
-            skip_bits(gb, num_bits_left);
-    }
-
-    return get_bits_count(gb) - cnt;
-}
-
-static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
-{
-    int err;
-    err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
-    if (err >= 0)
-        err = sbr_make_f_derived(ac, sbr);
-    if (err < 0) {
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "SBR reset failed. Switching SBR to pure upsampling mode.\n");
-        sbr_turnoff(sbr);
-    }
-}
-
-/**
- * Decode Spectral Band Replication extension data; reference: table 4.55.
- *
- * @param   crc flag indicating the presence of CRC checksum
- * @param   cnt length of TYPE_FIL syntactic element in bytes
- *
- * @return  Returns number of bytes consumed from the TYPE_FIL element.
- */
-int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
-                            GetBitContext *gb_host, int crc, int cnt, int id_aac)
-{
-    unsigned int num_sbr_bits = 0, num_align_bits;
-    unsigned bytes_read;
-    GetBitContext gbc = *gb_host, *gb = &gbc;
-    skip_bits_long(gb_host, cnt*8 - 4);
-
-    sbr->reset = 0;
-
-    if (!sbr->sample_rate)
-        sbr->sample_rate = 2 * ac->oc[1].m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
-    if (!ac->oc[1].m4ac.ext_sample_rate)
-        ac->oc[1].m4ac.ext_sample_rate = 2 * ac->oc[1].m4ac.sample_rate;
-
-    if (crc) {
-        skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
-        num_sbr_bits += 10;
-    }
-
-    //Save some state from the previous frame.
-    sbr->kx[0] = sbr->kx[1];
-    sbr->m[0] = sbr->m[1];
-    sbr->kx_and_m_pushed = 1;
-
-    num_sbr_bits++;
-    if (get_bits1(gb)) // bs_header_flag
-        num_sbr_bits += read_sbr_header(sbr, gb);
-
-    if (sbr->reset)
-        sbr_reset(ac, sbr);
-
-    if (sbr->start)
-        num_sbr_bits  += read_sbr_data(ac, sbr, gb, id_aac);
-
-    num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
-    bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
-
-    if (bytes_read > cnt) {
-        av_log(ac->avctx, AV_LOG_ERROR,
-               "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
-    }
-    return cnt;
-}
-
 /// Dequantization and stereo decoding (14496-3 sp04 p203)
 static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
 {
     int k, e;
     int ch;
-
+    static const double exp2_tab[2] = {1, M_SQRT2};
     if (id_aac == TYPE_CPE && sbr->bs_coupling) {
-        float alpha      = sbr->data[0].bs_amp_res ?  1.0f :  0.5f;
-        float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
+        int pan_offset = sbr->data[0].bs_amp_res ? 12 : 24;
         for (e = 1; e <= sbr->data[0].bs_num_env; e++) {
             for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
-                float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
-                float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
-                float fac   = temp1 / (1.0f + temp2);
+                float temp1, temp2, fac;
+                if (sbr->data[0].bs_amp_res) {
+                    temp1 = ff_exp2fi(sbr->data[0].env_facs_q[e][k] + 7);
+                    temp2 = ff_exp2fi(pan_offset - sbr->data[1].env_facs_q[e][k]);
+                }
+                else {
+                    temp1 = ff_exp2fi((sbr->data[0].env_facs_q[e][k]>>1) + 7) *
+                            exp2_tab[sbr->data[0].env_facs_q[e][k] & 1];
+                    temp2 = ff_exp2fi((pan_offset - sbr->data[1].env_facs_q[e][k])>>1) *
+                            exp2_tab[(pan_offset - sbr->data[1].env_facs_q[e][k]) & 1];
+                }
+                if (temp1 > 1E20) {
+                    av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
+                    temp1 = 1;
+                }
+                fac   = temp1 / (1.0f + temp2);
                 sbr->data[0].env_facs[e][k] = fac;
                 sbr->data[1].env_facs[e][k] = fac * temp2;
             }
         }
         for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
             for (k = 0; k < sbr->n_q; k++) {
-                float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
-                float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
-                float fac   = temp1 / (1.0f + temp2);
+                float temp1 = ff_exp2fi(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs_q[e][k] + 1);
+                float temp2 = ff_exp2fi(12 - sbr->data[1].noise_facs_q[e][k]);
+                float fac;
+                av_assert0(temp1 <= 1E20);
+                fac = temp1 / (1.0f + temp2);
                 sbr->data[0].noise_facs[e][k] = fac;
                 sbr->data[1].noise_facs[e][k] = fac * temp2;
             }
         }
     } else { // SCE or one non-coupled CPE
         for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
-            float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
             for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
-                for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
-                    sbr->data[ch].env_facs[e][k] =
-                        exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
+                for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
+                    if (sbr->data[ch].bs_amp_res)
+                        sbr->data[ch].env_facs[e][k] = ff_exp2fi(sbr->data[ch].env_facs_q[e][k] + 6);
+                    else
+                        sbr->data[ch].env_facs[e][k] = ff_exp2fi((sbr->data[ch].env_facs_q[e][k]>>1) + 6)
+                                                       * exp2_tab[sbr->data[ch].env_facs_q[e][k] & 1];
+                    if (sbr->data[ch].env_facs[e][k] > 1E20) {
+                        av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
+                        sbr->data[ch].env_facs[e][k] = 1;
+                    }
+                }
+
             for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
                 for (k = 0; k < sbr->n_q; k++)
                     sbr->data[ch].noise_facs[e][k] =
-                        exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
+                        ff_exp2fi(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs_q[e][k]);
         }
     }
 }
 
-/**
- * Analysis QMF Bank (14496-3 sp04 p206)
- *
- * @param   x       pointer to the beginning of the first sample window
- * @param   W       array of complex-valued samples split into subbands
- */
-#ifndef sbr_qmf_analysis
-static void sbr_qmf_analysis(AVFloatDSPContext *dsp, FFTContext *mdct,
-                             SBRDSPContext *sbrdsp, const float *in, float *x,
-                             float z[320], float W[2][32][32][2], int buf_idx)
-{
-    int i;
-    memcpy(x    , x+1024, (320-32)*sizeof(x[0]));
-    memcpy(x+288, in,         1024*sizeof(x[0]));
-    for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
-                               // are not supported
-        dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
-        sbrdsp->sum64x5(z);
-        sbrdsp->qmf_pre_shuffle(z);
-        mdct->imdct_half(mdct, z, z+64);
-        sbrdsp->qmf_post_shuffle(W[buf_idx][i], z);
-        x += 32;
-    }
-}
-#endif
-
-/**
- * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
- * (14496-3 sp04 p206)
- */
-#ifndef sbr_qmf_synthesis
-static void sbr_qmf_synthesis(FFTContext *mdct,
-                              SBRDSPContext *sbrdsp, AVFloatDSPContext *dsp,
-                              float *out, float X[2][38][64],
-                              float mdct_buf[2][64],
-                              float *v0, int *v_off, const unsigned int div)
-{
-    int i, n;
-    const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
-    const int step = 128 >> div;
-    float *v;
-    for (i = 0; i < 32; i++) {
-        if (*v_off < step) {
-            int saved_samples = (1280 - 128) >> div;
-            memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
-            *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - step;
-        } else {
-            *v_off -= step;
-        }
-        v = v0 + *v_off;
-        if (div) {
-            for (n = 0; n < 32; n++) {
-                X[0][i][   n] = -X[0][i][n];
-                X[0][i][32+n] =  X[1][i][31-n];
-            }
-            mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
-            sbrdsp->qmf_deint_neg(v, mdct_buf[0]);
-        } else {
-            sbrdsp->neg_odd_64(X[1][i]);
-            mdct->imdct_half(mdct, mdct_buf[0], X[0][i]);
-            mdct->imdct_half(mdct, mdct_buf[1], X[1][i]);
-            sbrdsp->qmf_deint_bfly(v, mdct_buf[1], mdct_buf[0]);
-        }
-        dsp->vector_fmul    (out, v                , sbr_qmf_window                       , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);
-        dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);
-        out += 64 >> div;
-    }
-}
-#endif
-
 /** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
  * (14496-3 sp04 p214)
  * Warning: This routine does not seem numerically stable.
@@ -1315,203 +212,6 @@ static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
     }
 }
 
-/// Generate the subband filtered lowband
-static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
-                      float X_low[32][40][2], const float W[2][32][32][2],
-                      int buf_idx)
-{
-    int i, k;
-    const int t_HFGen = 8;
-    const int i_f = 32;
-    memset(X_low, 0, 32*sizeof(*X_low));
-    for (k = 0; k < sbr->kx[1]; k++) {
-        for (i = t_HFGen; i < i_f + t_HFGen; i++) {
-            X_low[k][i][0] = W[buf_idx][i - t_HFGen][k][0];
-            X_low[k][i][1] = W[buf_idx][i - t_HFGen][k][1];
-        }
-    }
-    buf_idx = 1-buf_idx;
-    for (k = 0; k < sbr->kx[0]; k++) {
-        for (i = 0; i < t_HFGen; i++) {
-            X_low[k][i][0] = W[buf_idx][i + i_f - t_HFGen][k][0];
-            X_low[k][i][1] = W[buf_idx][i + i_f - t_HFGen][k][1];
-        }
-    }
-    return 0;
-}
-
-/// High Frequency Generator (14496-3 sp04 p215)
-static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
-                      float X_high[64][40][2], const float X_low[32][40][2],
-                      const float (*alpha0)[2], const float (*alpha1)[2],
-                      const float bw_array[5], const uint8_t *t_env,
-                      int bs_num_env)
-{
-    int j, x;
-    int g = 0;
-    int k = sbr->kx[1];
-    for (j = 0; j < sbr->num_patches; j++) {
-        for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
-            const int p = sbr->patch_start_subband[j] + x;
-            while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
-                g++;
-            g--;
-
-            if (g < 0) {
-                av_log(ac->avctx, AV_LOG_ERROR,
-                       "ERROR : no subband found for frequency %d\n", k);
-                return -1;
-            }
-
-            sbr->dsp.hf_gen(X_high[k] + ENVELOPE_ADJUSTMENT_OFFSET,
-                            X_low[p]  + ENVELOPE_ADJUSTMENT_OFFSET,
-                            alpha0[p], alpha1[p], bw_array[g],
-                            2 * t_env[0], 2 * t_env[bs_num_env]);
-        }
-    }
-    if (k < sbr->m[1] + sbr->kx[1])
-        memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
-
-    return 0;
-}
-
-/// Generate the subband filtered lowband
-static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][38][64],
-                     const float Y0[38][64][2], const float Y1[38][64][2],
-                     const float X_low[32][40][2], int ch)
-{
-    int k, i;
-    const int i_f = 32;
-    const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
-    memset(X, 0, 2*sizeof(*X));
-    for (k = 0; k < sbr->kx[0]; k++) {
-        for (i = 0; i < i_Temp; i++) {
-            X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
-            X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
-        }
-    }
-    for (; k < sbr->kx[0] + sbr->m[0]; k++) {
-        for (i = 0; i < i_Temp; i++) {
-            X[0][i][k] = Y0[i + i_f][k][0];
-            X[1][i][k] = Y0[i + i_f][k][1];
-        }
-    }
-
-    for (k = 0; k < sbr->kx[1]; k++) {
-        for (i = i_Temp; i < 38; i++) {
-            X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
-            X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
-        }
-    }
-    for (; k < sbr->kx[1] + sbr->m[1]; k++) {
-        for (i = i_Temp; i < i_f; i++) {
-            X[0][i][k] = Y1[i][k][0];
-            X[1][i][k] = Y1[i][k][1];
-        }
-    }
-    return 0;
-}
-
-/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
- * (14496-3 sp04 p217)
- */
-static int sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
-                        SBRData *ch_data, int e_a[2])
-{
-    int e, i, m;
-
-    memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
-    for (e = 0; e < ch_data->bs_num_env; e++) {
-        const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
-        uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
-        int k;
-
-        if (sbr->kx[1] != table[0]) {
-            av_log(ac->avctx, AV_LOG_ERROR, "kx != f_table{high,low}[0]. "
-                   "Derived frequency tables were not regenerated.\n");
-            sbr_turnoff(sbr);
-            return AVERROR_BUG;
-        }
-        for (i = 0; i < ilim; i++)
-            for (m = table[i]; m < table[i + 1]; m++)
-                sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
-
-        // ch_data->bs_num_noise > 1 => 2 noise floors
-        k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
-        for (i = 0; i < sbr->n_q; i++)
-            for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
-                sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
-
-        for (i = 0; i < sbr->n[1]; i++) {
-            if (ch_data->bs_add_harmonic_flag) {
-                const unsigned int m_midpoint =
-                    (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
-
-                ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
-                    (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
-            }
-        }
-
-        for (i = 0; i < ilim; i++) {
-            int additional_sinusoid_present = 0;
-            for (m = table[i]; m < table[i + 1]; m++) {
-                if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
-                    additional_sinusoid_present = 1;
-                    break;
-                }
-            }
-            memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
-                   (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
-        }
-    }
-
-    memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env], sizeof(ch_data->s_indexmapped[0]));
-    return 0;
-}
-
-/// Estimation of current envelope (14496-3 sp04 p218)
-static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
-                             SpectralBandReplication *sbr, SBRData *ch_data)
-{
-    int e, m;
-    int kx1 = sbr->kx[1];
-
-    if (sbr->bs_interpol_freq) {
-        for (e = 0; e < ch_data->bs_num_env; e++) {
-            const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
-            int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
-            int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
-
-            for (m = 0; m < sbr->m[1]; m++) {
-                float sum = sbr->dsp.sum_square(X_high[m+kx1] + ilb, iub - ilb);
-                e_curr[e][m] = sum * recip_env_size;
-            }
-        }
-    } else {
-        int k, p;
-
-        for (e = 0; e < ch_data->bs_num_env; e++) {
-            const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
-            int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
-            int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
-            const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
-
-            for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
-                float sum = 0.0f;
-                const int den = env_size * (table[p + 1] - table[p]);
-
-                for (k = table[p]; k < table[p + 1]; k++) {
-                    sum += sbr->dsp.sum_square(X_high[k] + ilb, iub - ilb);
-                }
-                sum /= den;
-                for (k = table[p]; k < table[p + 1]; k++) {
-                    e_curr[e][k - kx1] = sum;
-                }
-            }
-        }
-    }
-}
-
 /**
  * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
  * and Calculation of gain (14496-3 sp04 p219)
@@ -1541,6 +241,7 @@ static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
                                             ((1.0f + sbr->e_curr[e][m]) *
                                              (1.0f + sbr->q_mapped[e][m])));
                 }
+                sbr->gain[e][m] += FLT_MIN;
             }
             for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
                 sum[0] += sbr->e_origmapped[e][m];
@@ -1598,8 +299,14 @@ static void sbr_hf_assemble(float Y1[38][64][2],
             memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0],  m_max * sizeof(sbr->q_m[0][0]));
         }
     } else if (h_SL) {
-        memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
-        memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
+        for (i = 0; i < 4; i++) {
+            memcpy(g_temp[i + 2 * ch_data->t_env[0]],
+                   g_temp[i + 2 * ch_data->t_env_num_env_old],
+                   sizeof(g_temp[0]));
+            memcpy(q_temp[i + 2 * ch_data->t_env[0]],
+                   q_temp[i + 2 * ch_data->t_env_num_env_old],
+                   sizeof(q_temp[0]));
+        }
     }
 
     for (e = 0; e < ch_data->bs_num_env; e++) {
@@ -1660,85 +367,4 @@ static void sbr_hf_assemble(float Y1[38][64][2],
     ch_data->f_indexsine  = indexsine;
 }
 
-void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int id_aac,
-                  float* L, float* R)
-{
-    int downsampled = ac->oc[1].m4ac.ext_sample_rate < sbr->sample_rate;
-    int ch;
-    int nch = (id_aac == TYPE_CPE) ? 2 : 1;
-    int err;
-
-    if (!sbr->kx_and_m_pushed) {
-        sbr->kx[0] = sbr->kx[1];
-        sbr->m[0] = sbr->m[1];
-    } else {
-        sbr->kx_and_m_pushed = 0;
-    }
-
-    if (sbr->start) {
-        sbr_dequant(sbr, id_aac);
-    }
-    for (ch = 0; ch < nch; ch++) {
-        /* decode channel */
-        sbr_qmf_analysis(&ac->fdsp, &sbr->mdct_ana, &sbr->dsp, ch ? R : L, sbr->data[ch].analysis_filterbank_samples,
-                         (float*)sbr->qmf_filter_scratch,
-                         sbr->data[ch].W, sbr->data[ch].Ypos);
-        sbr->c.sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W, sbr->data[ch].Ypos);
-        sbr->data[ch].Ypos ^= 1;
-        if (sbr->start) {
-            sbr->c.sbr_hf_inverse_filter(&sbr->dsp, sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
-            sbr_chirp(sbr, &sbr->data[ch]);
-            sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
-                       sbr->data[ch].bw_array, sbr->data[ch].t_env,
-                       sbr->data[ch].bs_num_env);
-
-            // hf_adj
-            err = sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
-            if (!err) {
-                sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
-                sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
-                sbr->c.sbr_hf_assemble(sbr->data[ch].Y[sbr->data[ch].Ypos],
-                                sbr->X_high, sbr, &sbr->data[ch],
-                                sbr->data[ch].e_a);
-            }
-        }
-
-        /* synthesis */
-        sbr->c.sbr_x_gen(sbr, sbr->X[ch],
-                  sbr->data[ch].Y[1-sbr->data[ch].Ypos],
-                  sbr->data[ch].Y[  sbr->data[ch].Ypos],
-                  sbr->X_low, ch);
-    }
-
-    if (ac->oc[1].m4ac.ps == 1) {
-        if (sbr->ps.start) {
-            ff_ps_apply(ac->avctx, &sbr->ps, sbr->X[0], sbr->X[1], sbr->kx[1] + sbr->m[1]);
-        } else {
-            memcpy(sbr->X[1], sbr->X[0], sizeof(sbr->X[0]));
-        }
-        nch = 2;
-    }
-
-    sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
-                      L, sbr->X[0], sbr->qmf_filter_scratch,
-                      sbr->data[0].synthesis_filterbank_samples,
-                      &sbr->data[0].synthesis_filterbank_samples_offset,
-                      downsampled);
-    if (nch == 2)
-        sbr_qmf_synthesis(&sbr->mdct, &sbr->dsp, &ac->fdsp,
-                          R, sbr->X[1], sbr->qmf_filter_scratch,
-                          sbr->data[1].synthesis_filterbank_samples,
-                          &sbr->data[1].synthesis_filterbank_samples_offset,
-                          downsampled);
-}
-
-static void aacsbr_func_ptr_init(AACSBRContext *c)
-{
-    c->sbr_lf_gen            = sbr_lf_gen;
-    c->sbr_hf_assemble       = sbr_hf_assemble;
-    c->sbr_x_gen             = sbr_x_gen;
-    c->sbr_hf_inverse_filter = sbr_hf_inverse_filter;
-
-    if(ARCH_MIPS)
-        ff_aacsbr_func_ptr_init_mips(c);
-}
+#include "aacsbr_template.c"