* Copyright (c) 2007-2008 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
* Copyright (c) 2007 Justin Ruggles <justin.ruggles@gmail.com>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <math.h>
#include <string.h>
+#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
+#include "libavutil/downmix_info.h"
+#include "libavutil/opt.h"
+#include "bswapdsp.h"
#include "internal.h"
#include "aac_ac3_parser.h"
#include "ac3_parser.h"
#include "ac3dec.h"
#include "ac3dec_data.h"
-
-/** Large enough for maximum possible frame size when the specification limit is ignored */
-#define AC3_FRAME_BUFFER_SIZE 32768
+#include "kbdwin.h"
/**
* table for ungrouping 3 values in 7 bits.
*/
static uint8_t ungroup_3_in_7_bits_tab[128][3];
-
/** tables for ungrouping mantissas */
static int b1_mantissas[32][3];
static int b2_mantissas[128][3];
static float dynamic_range_tab[256];
/** Adjustments in dB gain */
-#define LEVEL_PLUS_3DB 1.4142135623730950
-#define LEVEL_PLUS_1POINT5DB 1.1892071150027209
-#define LEVEL_MINUS_1POINT5DB 0.8408964152537145
-#define LEVEL_MINUS_3DB 0.7071067811865476
-#define LEVEL_MINUS_4POINT5DB 0.5946035575013605
-#define LEVEL_MINUS_6DB 0.5000000000000000
-#define LEVEL_MINUS_9DB 0.3535533905932738
-#define LEVEL_ZERO 0.0000000000000000
-#define LEVEL_ONE 1.0000000000000000
-
static const float gain_levels[9] = {
LEVEL_PLUS_3DB,
LEVEL_PLUS_1POINT5DB,
LEVEL_MINUS_9DB
};
-/**
- * Table for center mix levels
- * reference: Section 5.4.2.4 cmixlev
- */
-static const uint8_t center_levels[4] = { 4, 5, 6, 5 };
-
-/**
- * Table for surround mix levels
- * reference: Section 5.4.2.5 surmixlev
- */
-static const uint8_t surround_levels[4] = { 4, 6, 7, 6 };
+/** Adjustments in dB gain (LFE, +10 to -21 dB) */
+static const float gain_levels_lfe[32] = {
+ 3.162275, 2.818382, 2.511886, 2.238719, 1.995261, 1.778278, 1.584893,
+ 1.412536, 1.258924, 1.122018, 1.000000, 0.891251, 0.794328, 0.707946,
+ 0.630957, 0.562341, 0.501187, 0.446683, 0.398107, 0.354813, 0.316227,
+ 0.281838, 0.251188, 0.223872, 0.199526, 0.177828, 0.158489, 0.141253,
+ 0.125892, 0.112201, 0.100000, 0.089125
+};
/**
* Table for default stereo downmixing coefficients
/* generate table for ungrouping 3 values in 7 bits
reference: Section 7.1.3 Exponent Decoding */
- for(i=0; i<128; i++) {
+ for (i = 0; i < 128; i++) {
ungroup_3_in_7_bits_tab[i][0] = i / 25;
ungroup_3_in_7_bits_tab[i][1] = (i % 25) / 5;
ungroup_3_in_7_bits_tab[i][2] = (i % 25) % 5;
/* generate grouped mantissa tables
reference: Section 7.3.5 Ungrouping of Mantissas */
- for(i=0; i<32; i++) {
+ for (i = 0; i < 32; i++) {
/* bap=1 mantissas */
b1_mantissas[i][0] = symmetric_dequant(ff_ac3_ungroup_3_in_5_bits_tab[i][0], 3);
b1_mantissas[i][1] = symmetric_dequant(ff_ac3_ungroup_3_in_5_bits_tab[i][1], 3);
b1_mantissas[i][2] = symmetric_dequant(ff_ac3_ungroup_3_in_5_bits_tab[i][2], 3);
}
- for(i=0; i<128; i++) {
+ for (i = 0; i < 128; i++) {
/* bap=2 mantissas */
b2_mantissas[i][0] = symmetric_dequant(ungroup_3_in_7_bits_tab[i][0], 5);
b2_mantissas[i][1] = symmetric_dequant(ungroup_3_in_7_bits_tab[i][1], 5);
}
/* generate ungrouped mantissa tables
reference: Tables 7.21 and 7.23 */
- for(i=0; i<7; i++) {
+ for (i = 0; i < 7; i++) {
/* bap=3 mantissas */
b3_mantissas[i] = symmetric_dequant(i, 7);
}
- for(i=0; i<15; i++) {
+ for (i = 0; i < 15; i++) {
/* bap=5 mantissas */
b5_mantissas[i] = symmetric_dequant(i, 15);
}
/* generate dynamic range table
reference: Section 7.7.1 Dynamic Range Control */
- for(i=0; i<256; i++) {
+ for (i = 0; i < 256; i++) {
int v = (i >> 5) - ((i >> 7) << 3) - 5;
dynamic_range_tab[i] = powf(2.0f, v) * ((i & 0x1F) | 0x20);
}
}
-
/**
* AVCodec initialization
*/
static av_cold int ac3_decode_init(AVCodecContext *avctx)
{
AC3DecodeContext *s = avctx->priv_data;
+ int i;
+
s->avctx = avctx;
- ac3_common_init();
+ ff_ac3_common_init();
ac3_tables_init();
ff_mdct_init(&s->imdct_256, 8, 1, 1.0);
ff_mdct_init(&s->imdct_512, 9, 1, 1.0);
ff_kbd_window_init(s->window, 5.0, 256);
- dsputil_init(&s->dsp, avctx);
+ ff_bswapdsp_init(&s->bdsp);
+ avpriv_float_dsp_init(&s->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
+ ff_ac3dsp_init(&s->ac3dsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
+ ff_fmt_convert_init(&s->fmt_conv, avctx);
av_lfg_init(&s->dith_state, 0);
- /* set bias values for float to int16 conversion */
- if(s->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
- s->add_bias = 385.0f;
- s->mul_bias = 1.0f;
- } else {
- s->add_bias = 0.0f;
- s->mul_bias = 32767.0f;
- }
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
/* allow downmixing to stereo or mono */
- if (avctx->channels > 0 && avctx->request_channels > 0 &&
- avctx->request_channels < avctx->channels &&
- avctx->request_channels <= 2) {
- avctx->channels = avctx->request_channels;
- }
+ if (avctx->channels > 1 &&
+ avctx->request_channel_layout == AV_CH_LAYOUT_MONO)
+ avctx->channels = 1;
+ else if (avctx->channels > 2 &&
+ avctx->request_channel_layout == AV_CH_LAYOUT_STEREO)
+ avctx->channels = 2;
s->downmixed = 1;
- /* allocate context input buffer */
- if (avctx->error_recognition >= FF_ER_CAREFUL) {
- s->input_buffer = av_mallocz(AC3_FRAME_BUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!s->input_buffer)
- return AVERROR(ENOMEM);
+ for (i = 0; i < AC3_MAX_CHANNELS; i++) {
+ s->xcfptr[i] = s->transform_coeffs[i];
+ s->dlyptr[i] = s->delay[i];
}
- avctx->sample_fmt = SAMPLE_FMT_S16;
return 0;
}
int i;
/* read the rest of the bsi. read twice for dual mono mode. */
- i = !(s->channel_mode);
+ i = !s->channel_mode;
do {
skip_bits(gbc, 5); // skip dialog normalization
if (get_bits1(gbc))
skip_bits(gbc, 2); //skip copyright bit and original bitstream bit
- /* skip the timecodes (or extra bitstream information for Alternate Syntax)
- TODO: read & use the xbsi1 downmix levels */
- if (get_bits1(gbc))
- skip_bits(gbc, 14); //skip timecode1 / xbsi1
- if (get_bits1(gbc))
- skip_bits(gbc, 14); //skip timecode2 / xbsi2
+ /* skip the timecodes or parse the Alternate Bit Stream Syntax */
+ if (s->bitstream_id != 6) {
+ if (get_bits1(gbc))
+ skip_bits(gbc, 14); //skip timecode1
+ if (get_bits1(gbc))
+ skip_bits(gbc, 14); //skip timecode2
+ } else {
+ if (get_bits1(gbc)) {
+ s->preferred_downmix = get_bits(gbc, 2);
+ s->center_mix_level_ltrt = get_bits(gbc, 3);
+ s->surround_mix_level_ltrt = av_clip(get_bits(gbc, 3), 3, 7);
+ s->center_mix_level = get_bits(gbc, 3);
+ s->surround_mix_level = av_clip(get_bits(gbc, 3), 3, 7);
+ }
+ if (get_bits1(gbc)) {
+ s->dolby_surround_ex_mode = get_bits(gbc, 2);
+ s->dolby_headphone_mode = get_bits(gbc, 2);
+ skip_bits(gbc, 10); // skip adconvtyp (1), xbsi2 (8), encinfo (1)
+ }
+ }
/* skip additional bitstream info */
if (get_bits1(gbc)) {
i = get_bits(gbc, 6);
do {
skip_bits(gbc, 8);
- } while(i--);
+ } while (i--);
}
return 0;
AC3HeaderInfo hdr;
int err;
- err = ff_ac3_parse_header(&s->gbc, &hdr);
- if(err)
+ err = avpriv_ac3_parse_header(&s->gbc, &hdr);
+ if (err)
return err;
/* get decoding parameters from header info */
s->bit_alloc_params.sr_code = hdr.sr_code;
+ s->bitstream_id = hdr.bitstream_id;
+ s->bitstream_mode = hdr.bitstream_mode;
s->channel_mode = hdr.channel_mode;
- s->channel_layout = hdr.channel_layout;
s->lfe_on = hdr.lfe_on;
s->bit_alloc_params.sr_shift = hdr.sr_shift;
s->sample_rate = hdr.sample_rate;
s->fbw_channels = s->channels - s->lfe_on;
s->lfe_ch = s->fbw_channels + 1;
s->frame_size = hdr.frame_size;
+ s->preferred_downmix = AC3_DMIXMOD_NOTINDICATED;
s->center_mix_level = hdr.center_mix_level;
+ s->center_mix_level_ltrt = 4; // -3.0dB
s->surround_mix_level = hdr.surround_mix_level;
+ s->surround_mix_level_ltrt = 4; // -3.0dB
+ s->lfe_mix_level_exists = 0;
s->num_blocks = hdr.num_blocks;
s->frame_type = hdr.frame_type;
s->substreamid = hdr.substreamid;
+ s->dolby_surround_mode = hdr.dolby_surround_mode;
+ s->dolby_surround_ex_mode = AC3_DSUREXMOD_NOTINDICATED;
+ s->dolby_headphone_mode = AC3_DHEADPHONMOD_NOTINDICATED;
- if(s->lfe_on) {
- s->start_freq[s->lfe_ch] = 0;
- s->end_freq[s->lfe_ch] = 7;
+ if (s->lfe_on) {
+ s->start_freq[s->lfe_ch] = 0;
+ s->end_freq[s->lfe_ch] = 7;
s->num_exp_groups[s->lfe_ch] = 2;
s->channel_in_cpl[s->lfe_ch] = 0;
}
- if (hdr.bitstream_id <= 10) {
+ if (s->bitstream_id <= 10) {
s->eac3 = 0;
s->snr_offset_strategy = 2;
s->block_switch_syntax = 1;
return ff_eac3_parse_header(s);
} else {
av_log(s->avctx, AV_LOG_ERROR, "E-AC-3 support not compiled in\n");
- return -1;
+ return AVERROR(ENOSYS);
}
}
* Set stereo downmixing coefficients based on frame header info.
* reference: Section 7.8.2 Downmixing Into Two Channels
*/
-static void set_downmix_coeffs(AC3DecodeContext *s)
+static int set_downmix_coeffs(AC3DecodeContext *s)
{
int i;
- float cmix = gain_levels[center_levels[s->center_mix_level]];
- float smix = gain_levels[surround_levels[s->surround_mix_level]];
+ float cmix = gain_levels[s-> center_mix_level];
+ float smix = gain_levels[s->surround_mix_level];
float norm0, norm1;
- for(i=0; i<s->fbw_channels; i++) {
- s->downmix_coeffs[i][0] = gain_levels[ac3_default_coeffs[s->channel_mode][i][0]];
- s->downmix_coeffs[i][1] = gain_levels[ac3_default_coeffs[s->channel_mode][i][1]];
+ if (!s->downmix_coeffs[0]) {
+ s->downmix_coeffs[0] = av_malloc(2 * AC3_MAX_CHANNELS *
+ sizeof(**s->downmix_coeffs));
+ if (!s->downmix_coeffs[0])
+ return AVERROR(ENOMEM);
+ s->downmix_coeffs[1] = s->downmix_coeffs[0] + AC3_MAX_CHANNELS;
+ }
+
+ for (i = 0; i < s->fbw_channels; i++) {
+ s->downmix_coeffs[0][i] = gain_levels[ac3_default_coeffs[s->channel_mode][i][0]];
+ s->downmix_coeffs[1][i] = gain_levels[ac3_default_coeffs[s->channel_mode][i][1]];
}
- if(s->channel_mode > 1 && s->channel_mode & 1) {
- s->downmix_coeffs[1][0] = s->downmix_coeffs[1][1] = cmix;
+ if (s->channel_mode > 1 && s->channel_mode & 1) {
+ s->downmix_coeffs[0][1] = s->downmix_coeffs[1][1] = cmix;
}
- if(s->channel_mode == AC3_CHMODE_2F1R || s->channel_mode == AC3_CHMODE_3F1R) {
+ if (s->channel_mode == AC3_CHMODE_2F1R || s->channel_mode == AC3_CHMODE_3F1R) {
int nf = s->channel_mode - 2;
- s->downmix_coeffs[nf][0] = s->downmix_coeffs[nf][1] = smix * LEVEL_MINUS_3DB;
+ s->downmix_coeffs[0][nf] = s->downmix_coeffs[1][nf] = smix * LEVEL_MINUS_3DB;
}
- if(s->channel_mode == AC3_CHMODE_2F2R || s->channel_mode == AC3_CHMODE_3F2R) {
+ if (s->channel_mode == AC3_CHMODE_2F2R || s->channel_mode == AC3_CHMODE_3F2R) {
int nf = s->channel_mode - 4;
- s->downmix_coeffs[nf][0] = s->downmix_coeffs[nf+1][1] = smix;
+ s->downmix_coeffs[0][nf] = s->downmix_coeffs[1][nf+1] = smix;
}
/* renormalize */
norm0 = norm1 = 0.0;
- for(i=0; i<s->fbw_channels; i++) {
- norm0 += s->downmix_coeffs[i][0];
- norm1 += s->downmix_coeffs[i][1];
+ for (i = 0; i < s->fbw_channels; i++) {
+ norm0 += s->downmix_coeffs[0][i];
+ norm1 += s->downmix_coeffs[1][i];
}
norm0 = 1.0f / norm0;
norm1 = 1.0f / norm1;
- for(i=0; i<s->fbw_channels; i++) {
- s->downmix_coeffs[i][0] *= norm0;
- s->downmix_coeffs[i][1] *= norm1;
+ for (i = 0; i < s->fbw_channels; i++) {
+ s->downmix_coeffs[0][i] *= norm0;
+ s->downmix_coeffs[1][i] *= norm1;
}
- if(s->output_mode == AC3_CHMODE_MONO) {
- for(i=0; i<s->fbw_channels; i++)
- s->downmix_coeffs[i][0] = (s->downmix_coeffs[i][0] + s->downmix_coeffs[i][1]) * LEVEL_MINUS_3DB;
+ if (s->output_mode == AC3_CHMODE_MONO) {
+ for (i = 0; i < s->fbw_channels; i++)
+ s->downmix_coeffs[0][i] = (s->downmix_coeffs[0][i] +
+ s->downmix_coeffs[1][i]) * LEVEL_MINUS_3DB;
}
+
+ return 0;
}
/**
/* unpack groups */
group_size = exp_strategy + (exp_strategy == EXP_D45);
- for(grp=0,i=0; grp<ngrps; grp++) {
+ for (grp = 0, i = 0; grp < ngrps; grp++) {
expacc = get_bits(gbc, 7);
dexp[i++] = ungroup_3_in_7_bits_tab[expacc][0];
dexp[i++] = ungroup_3_in_7_bits_tab[expacc][1];
/* convert to absolute exps and expand groups */
prevexp = absexp;
- for(i=0,j=0; i<ngrps*3; i++) {
+ for (i = 0, j = 0; i < ngrps * 3; i++) {
prevexp += dexp[i] - 2;
if (prevexp > 24U)
return -1;
switch (group_size) {
- case 4: dexps[j++] = prevexp;
- dexps[j++] = prevexp;
- case 2: dexps[j++] = prevexp;
- case 1: dexps[j++] = prevexp;
+ case 4: dexps[j++] = prevexp;
+ dexps[j++] = prevexp;
+ case 2: dexps[j++] = prevexp;
+ case 1: dexps[j++] = prevexp;
}
}
return 0;
if (s->channel_in_cpl[ch]) {
int cpl_coord = s->cpl_coords[ch][band] << 5;
for (bin = band_start; bin < band_end; bin++) {
- s->fixed_coeffs[ch][bin] = MULH(s->fixed_coeffs[CPL_CH][bin] << 4, cpl_coord);
+ s->fixed_coeffs[ch][bin] =
+ MULH(s->fixed_coeffs[CPL_CH][bin] << 4, cpl_coord);
}
if (ch == 2 && s->phase_flags[band]) {
for (bin = band_start; bin < band_end; bin++)
/**
* Grouped mantissas for 3-level 5-level and 11-level quantization
*/
-typedef struct {
+typedef struct mant_groups {
int b1_mant[2];
int b2_mant[2];
int b4_mant;
static void ac3_decode_transform_coeffs_ch(AC3DecodeContext *s, int ch_index, mant_groups *m)
{
int start_freq = s->start_freq[ch_index];
- int end_freq = s->end_freq[ch_index];
- uint8_t *baps = s->bap[ch_index];
- int8_t *exps = s->dexps[ch_index];
- int *coeffs = s->fixed_coeffs[ch_index];
- int dither = (ch_index == CPL_CH) || s->dither_flag[ch_index];
+ int end_freq = s->end_freq[ch_index];
+ uint8_t *baps = s->bap[ch_index];
+ int8_t *exps = s->dexps[ch_index];
+ int32_t *coeffs = s->fixed_coeffs[ch_index];
+ int dither = (ch_index == CPL_CH) || s->dither_flag[ch_index];
GetBitContext *gbc = &s->gbc;
int freq;
- for(freq = start_freq; freq < end_freq; freq++){
+ for (freq = start_freq; freq < end_freq; freq++) {
int bap = baps[freq];
int mantissa;
- switch(bap){
- case 0:
- if (dither)
- mantissa = (av_lfg_get(&s->dith_state) & 0x7FFFFF) - 0x400000;
- else
- mantissa = 0;
- break;
- case 1:
- if(m->b1){
- m->b1--;
- mantissa = m->b1_mant[m->b1];
- }
- else{
- int bits = get_bits(gbc, 5);
- mantissa = b1_mantissas[bits][0];
- m->b1_mant[1] = b1_mantissas[bits][1];
- m->b1_mant[0] = b1_mantissas[bits][2];
- m->b1 = 2;
- }
- break;
- case 2:
- if(m->b2){
- m->b2--;
- mantissa = m->b2_mant[m->b2];
- }
- else{
- int bits = get_bits(gbc, 7);
- mantissa = b2_mantissas[bits][0];
- m->b2_mant[1] = b2_mantissas[bits][1];
- m->b2_mant[0] = b2_mantissas[bits][2];
- m->b2 = 2;
- }
- break;
- case 3:
- mantissa = b3_mantissas[get_bits(gbc, 3)];
- break;
- case 4:
- if(m->b4){
- m->b4 = 0;
- mantissa = m->b4_mant;
- }
- else{
- int bits = get_bits(gbc, 7);
- mantissa = b4_mantissas[bits][0];
- m->b4_mant = b4_mantissas[bits][1];
- m->b4 = 1;
- }
- break;
- case 5:
- mantissa = b5_mantissas[get_bits(gbc, 4)];
- break;
- default: /* 6 to 15 */
- mantissa = get_bits(gbc, quantization_tab[bap]);
- /* Shift mantissa and sign-extend it. */
- mantissa = (mantissa << (32-quantization_tab[bap]))>>8;
- break;
+ switch (bap) {
+ case 0:
+ /* random noise with approximate range of -0.707 to 0.707 */
+ if (dither)
+ mantissa = (av_lfg_get(&s->dith_state) / 362) - 5932275;
+ else
+ mantissa = 0;
+ break;
+ case 1:
+ if (m->b1) {
+ m->b1--;
+ mantissa = m->b1_mant[m->b1];
+ } else {
+ int bits = get_bits(gbc, 5);
+ mantissa = b1_mantissas[bits][0];
+ m->b1_mant[1] = b1_mantissas[bits][1];
+ m->b1_mant[0] = b1_mantissas[bits][2];
+ m->b1 = 2;
+ }
+ break;
+ case 2:
+ if (m->b2) {
+ m->b2--;
+ mantissa = m->b2_mant[m->b2];
+ } else {
+ int bits = get_bits(gbc, 7);
+ mantissa = b2_mantissas[bits][0];
+ m->b2_mant[1] = b2_mantissas[bits][1];
+ m->b2_mant[0] = b2_mantissas[bits][2];
+ m->b2 = 2;
+ }
+ break;
+ case 3:
+ mantissa = b3_mantissas[get_bits(gbc, 3)];
+ break;
+ case 4:
+ if (m->b4) {
+ m->b4 = 0;
+ mantissa = m->b4_mant;
+ } else {
+ int bits = get_bits(gbc, 7);
+ mantissa = b4_mantissas[bits][0];
+ m->b4_mant = b4_mantissas[bits][1];
+ m->b4 = 1;
+ }
+ break;
+ case 5:
+ mantissa = b5_mantissas[get_bits(gbc, 4)];
+ break;
+ default: /* 6 to 15 */
+ /* Shift mantissa and sign-extend it. */
+ mantissa = get_sbits(gbc, quantization_tab[bap]);
+ mantissa <<= 24 - quantization_tab[bap];
+ break;
}
coeffs[freq] = mantissa >> exps[freq];
}
static void remove_dithering(AC3DecodeContext *s) {
int ch, i;
- for(ch=1; ch<=s->fbw_channels; ch++) {
- if(!s->dither_flag[ch] && s->channel_in_cpl[ch]) {
- for(i = s->start_freq[CPL_CH]; i<s->end_freq[CPL_CH]; i++) {
- if(!s->bap[CPL_CH][i])
+ for (ch = 1; ch <= s->fbw_channels; ch++) {
+ if (!s->dither_flag[ch] && s->channel_in_cpl[ch]) {
+ for (i = s->start_freq[CPL_CH]; i < s->end_freq[CPL_CH]; i++) {
+ if (!s->bap[CPL_CH][i])
s->fixed_coeffs[ch][i] = 0;
}
}
}
}
-static void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk, int ch,
- mant_groups *m)
+static inline void decode_transform_coeffs_ch(AC3DecodeContext *s, int blk,
+ int ch, mant_groups *m)
{
if (!s->channel_uses_aht[ch]) {
ac3_decode_transform_coeffs_ch(s, ch, m);
/**
* Decode the transform coefficients.
*/
-static void decode_transform_coeffs(AC3DecodeContext *s, int blk)
+static inline void decode_transform_coeffs(AC3DecodeContext *s, int blk)
{
int ch, end;
int got_cplchan = 0;
for (ch = 1; ch <= s->channels; ch++) {
/* transform coefficients for full-bandwidth channel */
decode_transform_coeffs_ch(s, blk, ch, &m);
- /* tranform coefficients for coupling channel come right after the
+ /* transform coefficients for coupling channel come right after the
coefficients for the first coupled channel*/
if (s->channel_in_cpl[ch]) {
if (!got_cplchan) {
}
do
s->fixed_coeffs[ch][end] = 0;
- while(++end < 256);
+ while (++end < 256);
}
/* zero the dithered coefficients for appropriate channels */
end = FFMIN(s->end_freq[1], s->end_freq[2]);
- for(bnd=0; bnd<s->num_rematrixing_bands; bnd++) {
- if(s->rematrixing_flags[bnd]) {
- bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd+1]);
- for(i=ff_ac3_rematrix_band_tab[bnd]; i<bndend; i++) {
+ for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++) {
+ if (s->rematrixing_flags[bnd]) {
+ bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd + 1]);
+ for (i = ff_ac3_rematrix_band_tab[bnd]; i < bndend; i++) {
int tmp0 = s->fixed_coeffs[1][i];
s->fixed_coeffs[1][i] += s->fixed_coeffs[2][i];
s->fixed_coeffs[2][i] = tmp0 - s->fixed_coeffs[2][i];
static inline void do_imdct(AC3DecodeContext *s, int channels)
{
int ch;
- float add_bias = s->add_bias;
- if(s->out_channels==1 && channels>1)
- add_bias *= LEVEL_MINUS_3DB; // compensate for the gain in downmix
- for (ch=1; ch<=channels; ch++) {
+ for (ch = 1; ch <= channels; ch++) {
if (s->block_switch[ch]) {
int i;
- float *x = s->tmp_output+128;
- for(i=0; i<128; i++)
- x[i] = s->transform_coeffs[ch][2*i];
- ff_imdct_half(&s->imdct_256, s->tmp_output, x);
- s->dsp.vector_fmul_window(s->output[ch-1], s->delay[ch-1], s->tmp_output, s->window, add_bias, 128);
- for(i=0; i<128; i++)
- x[i] = s->transform_coeffs[ch][2*i+1];
- ff_imdct_half(&s->imdct_256, s->delay[ch-1], x);
+ float *x = s->tmp_output + 128;
+ for (i = 0; i < 128; i++)
+ x[i] = s->transform_coeffs[ch][2 * i];
+ s->imdct_256.imdct_half(&s->imdct_256, s->tmp_output, x);
+ s->fdsp.vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1],
+ s->tmp_output, s->window, 128);
+ for (i = 0; i < 128; i++)
+ x[i] = s->transform_coeffs[ch][2 * i + 1];
+ s->imdct_256.imdct_half(&s->imdct_256, s->delay[ch - 1], x);
} else {
- ff_imdct_half(&s->imdct_512, s->tmp_output, s->transform_coeffs[ch]);
- s->dsp.vector_fmul_window(s->output[ch-1], s->delay[ch-1], s->tmp_output, s->window, add_bias, 128);
- memcpy(s->delay[ch-1], s->tmp_output+128, 128*sizeof(float));
- }
- }
-}
-
-/**
- * Downmix the output to mono or stereo.
- */
-void ff_ac3_downmix_c(float (*samples)[256], float (*matrix)[2], int out_ch, int in_ch, int len)
-{
- int i, j;
- float v0, v1;
- if(out_ch == 2) {
- for(i=0; i<len; i++) {
- v0 = v1 = 0.0f;
- for(j=0; j<in_ch; j++) {
- v0 += samples[j][i] * matrix[j][0];
- v1 += samples[j][i] * matrix[j][1];
- }
- samples[0][i] = v0;
- samples[1][i] = v1;
- }
- } else if(out_ch == 1) {
- for(i=0; i<len; i++) {
- v0 = 0.0f;
- for(j=0; j<in_ch; j++)
- v0 += samples[j][i] * matrix[j][0];
- samples[0][i] = v0;
+ s->imdct_512.imdct_half(&s->imdct_512, s->tmp_output, s->transform_coeffs[ch]);
+ s->fdsp.vector_fmul_window(s->outptr[ch - 1], s->delay[ch - 1],
+ s->tmp_output, s->window, 128);
+ memcpy(s->delay[ch - 1], s->tmp_output + 128, 128 * sizeof(float));
}
}
}
static void ac3_upmix_delay(AC3DecodeContext *s)
{
int channel_data_size = sizeof(s->delay[0]);
- switch(s->channel_mode) {
- case AC3_CHMODE_DUALMONO:
- case AC3_CHMODE_STEREO:
- /* upmix mono to stereo */
- memcpy(s->delay[1], s->delay[0], channel_data_size);
- break;
- case AC3_CHMODE_2F2R:
- memset(s->delay[3], 0, channel_data_size);
- case AC3_CHMODE_2F1R:
- memset(s->delay[2], 0, channel_data_size);
- break;
- case AC3_CHMODE_3F2R:
- memset(s->delay[4], 0, channel_data_size);
- case AC3_CHMODE_3F1R:
- memset(s->delay[3], 0, channel_data_size);
- case AC3_CHMODE_3F:
- memcpy(s->delay[2], s->delay[1], channel_data_size);
- memset(s->delay[1], 0, channel_data_size);
- break;
+ switch (s->channel_mode) {
+ case AC3_CHMODE_DUALMONO:
+ case AC3_CHMODE_STEREO:
+ /* upmix mono to stereo */
+ memcpy(s->delay[1], s->delay[0], channel_data_size);
+ break;
+ case AC3_CHMODE_2F2R:
+ memset(s->delay[3], 0, channel_data_size);
+ case AC3_CHMODE_2F1R:
+ memset(s->delay[2], 0, channel_data_size);
+ break;
+ case AC3_CHMODE_3F2R:
+ memset(s->delay[4], 0, channel_data_size);
+ case AC3_CHMODE_3F1R:
+ memset(s->delay[3], 0, channel_data_size);
+ case AC3_CHMODE_3F:
+ memcpy(s->delay[2], s->delay[1], channel_data_size);
+ memset(s->delay[1], 0, channel_data_size);
+ break;
}
}
bnd_sz[0] = ecpl ? 6 : 12;
for (bnd = 0, subbnd = 1; subbnd < n_subbands; subbnd++) {
int subbnd_size = (ecpl && subbnd < 4) ? 6 : 12;
- if (band_struct[subbnd-1]) {
+ if (band_struct[subbnd - 1]) {
n_bands--;
bnd_sz[bnd] += subbnd_size;
} else {
memcpy(band_sizes, bnd_sz, n_bands);
}
+static inline int spx_strategy(AC3DecodeContext *s, int blk)
+{
+ GetBitContext *bc = &s->gbc;
+ int fbw_channels = s->fbw_channels;
+ int dst_start_freq, dst_end_freq, src_start_freq,
+ start_subband, end_subband, ch;
+
+ /* determine which channels use spx */
+ if (s->channel_mode == AC3_CHMODE_MONO) {
+ s->channel_uses_spx[1] = 1;
+ } else {
+ for (ch = 1; ch <= fbw_channels; ch++)
+ s->channel_uses_spx[ch] = get_bits1(bc);
+ }
+
+ /* get the frequency bins of the spx copy region and the spx start
+ and end subbands */
+ dst_start_freq = get_bits(bc, 2);
+ start_subband = get_bits(bc, 3) + 2;
+ if (start_subband > 7)
+ start_subband += start_subband - 7;
+ end_subband = get_bits(bc, 3) + 5;
+ if (end_subband > 7)
+ end_subband += end_subband - 7;
+ dst_start_freq = dst_start_freq * 12 + 25;
+ src_start_freq = start_subband * 12 + 25;
+ dst_end_freq = end_subband * 12 + 25;
+
+ /* check validity of spx ranges */
+ if (start_subband >= end_subband) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
+ "range (%d >= %d)\n", start_subband, end_subband);
+ return AVERROR_INVALIDDATA;
+ }
+ if (dst_start_freq >= src_start_freq) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
+ "copy start bin (%d >= %d)\n", dst_start_freq, src_start_freq);
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->spx_dst_start_freq = dst_start_freq;
+ s->spx_src_start_freq = src_start_freq;
+ s->spx_dst_end_freq = dst_end_freq;
+
+ decode_band_structure(bc, blk, s->eac3, 0,
+ start_subband, end_subband,
+ ff_eac3_default_spx_band_struct,
+ &s->num_spx_bands,
+ s->spx_band_sizes);
+
+ return 0;
+}
+
+static inline void spx_coordinates(AC3DecodeContext *s)
+{
+ GetBitContext *bc = &s->gbc;
+ int fbw_channels = s->fbw_channels;
+ int ch, bnd;
+
+ for (ch = 1; ch <= fbw_channels; ch++) {
+ if (s->channel_uses_spx[ch]) {
+ if (s->first_spx_coords[ch] || get_bits1(bc)) {
+ float spx_blend;
+ int bin, master_spx_coord;
+
+ s->first_spx_coords[ch] = 0;
+ spx_blend = get_bits(bc, 5) * (1.0f / 32);
+ master_spx_coord = get_bits(bc, 2) * 3;
+
+ bin = s->spx_src_start_freq;
+ for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
+ int bandsize;
+ int spx_coord_exp, spx_coord_mant;
+ float nratio, sblend, nblend, spx_coord;
+
+ /* calculate blending factors */
+ bandsize = s->spx_band_sizes[bnd];
+ nratio = ((float)((bin + (bandsize >> 1))) / s->spx_dst_end_freq) - spx_blend;
+ nratio = av_clipf(nratio, 0.0f, 1.0f);
+ nblend = sqrtf(3.0f * nratio); // noise is scaled by sqrt(3)
+ // to give unity variance
+ sblend = sqrtf(1.0f - nratio);
+ bin += bandsize;
+
+ /* decode spx coordinates */
+ spx_coord_exp = get_bits(bc, 4);
+ spx_coord_mant = get_bits(bc, 2);
+ if (spx_coord_exp == 15) spx_coord_mant <<= 1;
+ else spx_coord_mant += 4;
+ spx_coord_mant <<= (25 - spx_coord_exp - master_spx_coord);
+ spx_coord = spx_coord_mant * (1.0f / (1 << 23));
+
+ /* multiply noise and signal blending factors by spx coordinate */
+ s->spx_noise_blend [ch][bnd] = nblend * spx_coord;
+ s->spx_signal_blend[ch][bnd] = sblend * spx_coord;
+ }
+ }
+ } else {
+ s->first_spx_coords[ch] = 1;
+ }
+ }
+}
+
+static inline int coupling_strategy(AC3DecodeContext *s, int blk,
+ uint8_t *bit_alloc_stages)
+{
+ GetBitContext *bc = &s->gbc;
+ int fbw_channels = s->fbw_channels;
+ int channel_mode = s->channel_mode;
+ int ch;
+
+ memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
+ if (!s->eac3)
+ s->cpl_in_use[blk] = get_bits1(bc);
+ if (s->cpl_in_use[blk]) {
+ /* coupling in use */
+ int cpl_start_subband, cpl_end_subband;
+
+ if (channel_mode < AC3_CHMODE_STEREO) {
+ av_log(s->avctx, AV_LOG_ERROR, "coupling not allowed in mono or dual-mono\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* check for enhanced coupling */
+ if (s->eac3 && get_bits1(bc)) {
+ /* TODO: parse enhanced coupling strategy info */
+ avpriv_request_sample(s->avctx, "Enhanced coupling");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ /* determine which channels are coupled */
+ if (s->eac3 && s->channel_mode == AC3_CHMODE_STEREO) {
+ s->channel_in_cpl[1] = 1;
+ s->channel_in_cpl[2] = 1;
+ } else {
+ for (ch = 1; ch <= fbw_channels; ch++)
+ s->channel_in_cpl[ch] = get_bits1(bc);
+ }
+
+ /* phase flags in use */
+ if (channel_mode == AC3_CHMODE_STEREO)
+ s->phase_flags_in_use = get_bits1(bc);
+
+ /* coupling frequency range */
+ cpl_start_subband = get_bits(bc, 4);
+ cpl_end_subband = s->spx_in_use ? (s->spx_src_start_freq - 37) / 12 :
+ get_bits(bc, 4) + 3;
+ if (cpl_start_subband >= cpl_end_subband) {
+ av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
+ cpl_start_subband, cpl_end_subband);
+ return AVERROR_INVALIDDATA;
+ }
+ s->start_freq[CPL_CH] = cpl_start_subband * 12 + 37;
+ s->end_freq[CPL_CH] = cpl_end_subband * 12 + 37;
+
+ decode_band_structure(bc, blk, s->eac3, 0, cpl_start_subband,
+ cpl_end_subband,
+ ff_eac3_default_cpl_band_struct,
+ &s->num_cpl_bands, s->cpl_band_sizes);
+ } else {
+ /* coupling not in use */
+ for (ch = 1; ch <= fbw_channels; ch++) {
+ s->channel_in_cpl[ch] = 0;
+ s->first_cpl_coords[ch] = 1;
+ }
+ s->first_cpl_leak = s->eac3;
+ s->phase_flags_in_use = 0;
+ }
+
+ return 0;
+}
+
+static inline int coupling_coordinates(AC3DecodeContext *s, int blk)
+{
+ GetBitContext *bc = &s->gbc;
+ int fbw_channels = s->fbw_channels;
+ int ch, bnd;
+ int cpl_coords_exist = 0;
+
+ for (ch = 1; ch <= fbw_channels; ch++) {
+ if (s->channel_in_cpl[ch]) {
+ if ((s->eac3 && s->first_cpl_coords[ch]) || get_bits1(bc)) {
+ int master_cpl_coord, cpl_coord_exp, cpl_coord_mant;
+ s->first_cpl_coords[ch] = 0;
+ cpl_coords_exist = 1;
+ master_cpl_coord = 3 * get_bits(bc, 2);
+ for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
+ cpl_coord_exp = get_bits(bc, 4);
+ cpl_coord_mant = get_bits(bc, 4);
+ if (cpl_coord_exp == 15)
+ s->cpl_coords[ch][bnd] = cpl_coord_mant << 22;
+ else
+ s->cpl_coords[ch][bnd] = (cpl_coord_mant + 16) << 21;
+ s->cpl_coords[ch][bnd] >>= (cpl_coord_exp + master_cpl_coord);
+ }
+ } else if (!blk) {
+ av_log(s->avctx, AV_LOG_ERROR, "new coupling coordinates must "
+ "be present in block 0\n");
+ return AVERROR_INVALIDDATA;
+ }
+ } else {
+ /* channel not in coupling */
+ s->first_cpl_coords[ch] = 1;
+ }
+ }
+ /* phase flags */
+ if (s->channel_mode == AC3_CHMODE_STEREO && cpl_coords_exist) {
+ for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
+ s->phase_flags[bnd] = s->phase_flags_in_use ? get_bits1(bc) : 0;
+ }
+ }
+
+ return 0;
+}
+
/**
* Decode a single audio block from the AC-3 bitstream.
*/
{
int fbw_channels = s->fbw_channels;
int channel_mode = s->channel_mode;
- int i, bnd, seg, ch;
+ int i, bnd, seg, ch, ret;
int different_transforms;
int downmix_output;
int cpl_in_use;
GetBitContext *gbc = &s->gbc;
- uint8_t bit_alloc_stages[AC3_MAX_CHANNELS];
-
- memset(bit_alloc_stages, 0, AC3_MAX_CHANNELS);
+ uint8_t bit_alloc_stages[AC3_MAX_CHANNELS] = { 0 };
/* block switch flags */
different_transforms = 0;
if (s->block_switch_syntax) {
for (ch = 1; ch <= fbw_channels; ch++) {
s->block_switch[ch] = get_bits1(gbc);
- if(ch > 1 && s->block_switch[ch] != s->block_switch[1])
+ if (ch > 1 && s->block_switch[ch] != s->block_switch[1])
different_transforms = 1;
}
}
}
/* dynamic range */
- i = !(s->channel_mode);
+ i = !s->channel_mode;
do {
- if(get_bits1(gbc)) {
- s->dynamic_range[i] = ((dynamic_range_tab[get_bits(gbc, 8)]-1.0) *
- s->avctx->drc_scale)+1.0;
- } else if(blk == 0) {
+ if (get_bits1(gbc)) {
+ /* Allow asymmetric application of DRC when drc_scale > 1.
+ Amplification of quiet sounds is enhanced */
+ float range = dynamic_range_tab[get_bits(gbc, 8)];
+ if (range > 1.0 || s->drc_scale <= 1.0)
+ s->dynamic_range[i] = powf(range, s->drc_scale);
+ else
+ s->dynamic_range[i] = range;
+ } else if (blk == 0) {
s->dynamic_range[i] = 1.0f;
}
- } while(i--);
+ } while (i--);
/* spectral extension strategy */
if (s->eac3 && (!blk || get_bits1(gbc))) {
s->spx_in_use = get_bits1(gbc);
if (s->spx_in_use) {
- int dst_start_freq, dst_end_freq, src_start_freq,
- start_subband, end_subband;
-
- /* determine which channels use spx */
- if (s->channel_mode == AC3_CHMODE_MONO) {
- s->channel_uses_spx[1] = 1;
- } else {
- for (ch = 1; ch <= fbw_channels; ch++)
- s->channel_uses_spx[ch] = get_bits1(gbc);
- }
-
- /* get the frequency bins of the spx copy region and the spx start
- and end subbands */
- dst_start_freq = get_bits(gbc, 2);
- start_subband = get_bits(gbc, 3) + 2;
- if (start_subband > 7)
- start_subband += start_subband - 7;
- end_subband = get_bits(gbc, 3) + 5;
- if (end_subband > 7)
- end_subband += end_subband - 7;
- dst_start_freq = dst_start_freq * 12 + 25;
- src_start_freq = start_subband * 12 + 25;
- dst_end_freq = end_subband * 12 + 25;
-
- /* check validity of spx ranges */
- if (start_subband >= end_subband) {
- av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
- "range (%d >= %d)\n", start_subband, end_subband);
- return -1;
- }
- if (dst_start_freq >= src_start_freq) {
- av_log(s->avctx, AV_LOG_ERROR, "invalid spectral extension "
- "copy start bin (%d >= %d)\n", dst_start_freq, src_start_freq);
- return -1;
- }
-
- s->spx_dst_start_freq = dst_start_freq;
- s->spx_src_start_freq = src_start_freq;
- s->spx_dst_end_freq = dst_end_freq;
-
- decode_band_structure(gbc, blk, s->eac3, 0,
- start_subband, end_subband,
- ff_eac3_default_spx_band_struct,
- &s->num_spx_bands,
- s->spx_band_sizes);
+ if ((ret = spx_strategy(s, blk)) < 0)
+ return ret;
} else {
for (ch = 1; ch <= fbw_channels; ch++) {
s->channel_uses_spx[ch] = 0;
}
/* spectral extension coordinates */
- if (s->spx_in_use) {
- for (ch = 1; ch <= fbw_channels; ch++) {
- if (s->channel_uses_spx[ch]) {
- if (s->first_spx_coords[ch] || get_bits1(gbc)) {
- float spx_blend;
- int bin, master_spx_coord;
-
- s->first_spx_coords[ch] = 0;
- spx_blend = get_bits(gbc, 5) * (1.0f/32);
- master_spx_coord = get_bits(gbc, 2) * 3;
-
- bin = s->spx_src_start_freq;
- for (bnd = 0; bnd < s->num_spx_bands; bnd++) {
- int bandsize;
- int spx_coord_exp, spx_coord_mant;
- float nratio, sblend, nblend, spx_coord;
-
- /* calculate blending factors */
- bandsize = s->spx_band_sizes[bnd];
- nratio = ((float)((bin + (bandsize >> 1))) / s->spx_dst_end_freq) - spx_blend;
- nratio = av_clipf(nratio, 0.0f, 1.0f);
- nblend = sqrtf(3.0f * nratio); // noise is scaled by sqrt(3) to give unity variance
- sblend = sqrtf(1.0f - nratio);
- bin += bandsize;
-
- /* decode spx coordinates */
- spx_coord_exp = get_bits(gbc, 4);
- spx_coord_mant = get_bits(gbc, 2);
- if (spx_coord_exp == 15) spx_coord_mant <<= 1;
- else spx_coord_mant += 4;
- spx_coord_mant <<= (25 - spx_coord_exp - master_spx_coord);
- spx_coord = spx_coord_mant * (1.0f/(1<<23));
-
- /* multiply noise and signal blending factors by spx coordinate */
- s->spx_noise_blend [ch][bnd] = nblend * spx_coord;
- s->spx_signal_blend[ch][bnd] = sblend * spx_coord;
- }
- }
- } else {
- s->first_spx_coords[ch] = 1;
- }
- }
- }
+ if (s->spx_in_use)
+ spx_coordinates(s);
/* coupling strategy */
if (s->eac3 ? s->cpl_strategy_exists[blk] : get_bits1(gbc)) {
- memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
- if (!s->eac3)
- s->cpl_in_use[blk] = get_bits1(gbc);
- if (s->cpl_in_use[blk]) {
- /* coupling in use */
- int cpl_start_subband, cpl_end_subband;
-
- if (channel_mode < AC3_CHMODE_STEREO) {
- av_log(s->avctx, AV_LOG_ERROR, "coupling not allowed in mono or dual-mono\n");
- return -1;
- }
-
- /* check for enhanced coupling */
- if (s->eac3 && get_bits1(gbc)) {
- /* TODO: parse enhanced coupling strategy info */
- av_log_missing_feature(s->avctx, "Enhanced coupling", 1);
- return -1;
- }
-
- /* determine which channels are coupled */
- if (s->eac3 && s->channel_mode == AC3_CHMODE_STEREO) {
- s->channel_in_cpl[1] = 1;
- s->channel_in_cpl[2] = 1;
- } else {
- for (ch = 1; ch <= fbw_channels; ch++)
- s->channel_in_cpl[ch] = get_bits1(gbc);
- }
-
- /* phase flags in use */
- if (channel_mode == AC3_CHMODE_STEREO)
- s->phase_flags_in_use = get_bits1(gbc);
-
- /* coupling frequency range */
- cpl_start_subband = get_bits(gbc, 4);
- cpl_end_subband = s->spx_in_use ? (s->spx_src_start_freq - 37) / 12 :
- get_bits(gbc, 4) + 3;
- if (cpl_start_subband >= cpl_end_subband) {
- av_log(s->avctx, AV_LOG_ERROR, "invalid coupling range (%d >= %d)\n",
- cpl_start_subband, cpl_end_subband);
- return -1;
- }
- s->start_freq[CPL_CH] = cpl_start_subband * 12 + 37;
- s->end_freq[CPL_CH] = cpl_end_subband * 12 + 37;
-
- decode_band_structure(gbc, blk, s->eac3, 0, cpl_start_subband,
- cpl_end_subband,
- ff_eac3_default_cpl_band_struct,
- &s->num_cpl_bands, s->cpl_band_sizes);
- } else {
- /* coupling not in use */
- for (ch = 1; ch <= fbw_channels; ch++) {
- s->channel_in_cpl[ch] = 0;
- s->first_cpl_coords[ch] = 1;
- }
- s->first_cpl_leak = s->eac3;
- s->phase_flags_in_use = 0;
- }
+ if ((ret = coupling_strategy(s, blk, bit_alloc_stages)) < 0)
+ return ret;
} else if (!s->eac3) {
- if(!blk) {
- av_log(s->avctx, AV_LOG_ERROR, "new coupling strategy must be present in block 0\n");
- return -1;
+ if (!blk) {
+ av_log(s->avctx, AV_LOG_ERROR, "new coupling strategy must "
+ "be present in block 0\n");
+ return AVERROR_INVALIDDATA;
} else {
s->cpl_in_use[blk] = s->cpl_in_use[blk-1];
}
/* coupling coordinates */
if (cpl_in_use) {
- int cpl_coords_exist = 0;
-
- for (ch = 1; ch <= fbw_channels; ch++) {
- if (s->channel_in_cpl[ch]) {
- if ((s->eac3 && s->first_cpl_coords[ch]) || get_bits1(gbc)) {
- int master_cpl_coord, cpl_coord_exp, cpl_coord_mant;
- s->first_cpl_coords[ch] = 0;
- cpl_coords_exist = 1;
- master_cpl_coord = 3 * get_bits(gbc, 2);
- for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
- cpl_coord_exp = get_bits(gbc, 4);
- cpl_coord_mant = get_bits(gbc, 4);
- if (cpl_coord_exp == 15)
- s->cpl_coords[ch][bnd] = cpl_coord_mant << 22;
- else
- s->cpl_coords[ch][bnd] = (cpl_coord_mant + 16) << 21;
- s->cpl_coords[ch][bnd] >>= (cpl_coord_exp + master_cpl_coord);
- }
- } else if (!blk) {
- av_log(s->avctx, AV_LOG_ERROR, "new coupling coordinates must be present in block 0\n");
- return -1;
- }
- } else {
- /* channel not in coupling */
- s->first_cpl_coords[ch] = 1;
- }
- }
- /* phase flags */
- if (channel_mode == AC3_CHMODE_STEREO && cpl_coords_exist) {
- for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
- s->phase_flags[bnd] = s->phase_flags_in_use? get_bits1(gbc) : 0;
- }
- }
+ if ((ret = coupling_coordinates(s, blk)) < 0)
+ return ret;
}
/* stereo rematrixing strategy and band structure */
} else if (s->spx_in_use && s->spx_src_start_freq <= 61) {
s->num_rematrixing_bands--;
}
- for(bnd=0; bnd<s->num_rematrixing_bands; bnd++)
+ for (bnd = 0; bnd < s->num_rematrixing_bands; bnd++)
s->rematrixing_flags[bnd] = get_bits1(gbc);
} else if (!blk) {
- av_log(s->avctx, AV_LOG_WARNING, "Warning: new rematrixing strategy not present in block 0\n");
+ av_log(s->avctx, AV_LOG_WARNING, "Warning: "
+ "new rematrixing strategy not present in block 0\n");
s->num_rematrixing_bands = 0;
}
}
for (ch = !cpl_in_use; ch <= s->channels; ch++) {
if (!s->eac3)
s->exp_strategy[blk][ch] = get_bits(gbc, 2 - (ch == s->lfe_ch));
- if(s->exp_strategy[blk][ch] != EXP_REUSE)
+ if (s->exp_strategy[blk][ch] != EXP_REUSE)
bit_alloc_stages[ch] = 3;
}
int bandwidth_code = get_bits(gbc, 6);
if (bandwidth_code > 60) {
av_log(s->avctx, AV_LOG_ERROR, "bandwidth code = %d > 60\n", bandwidth_code);
- return -1;
+ return AVERROR_INVALIDDATA;
}
s->end_freq[ch] = bandwidth_code * 3 + 73;
}
group_size = 3 << (s->exp_strategy[blk][ch] - 1);
- s->num_exp_groups[ch] = (s->end_freq[ch]+group_size-4) / group_size;
- if(blk > 0 && s->end_freq[ch] != prev)
+ s->num_exp_groups[ch] = (s->end_freq[ch] + group_size-4) / group_size;
+ if (blk > 0 && s->end_freq[ch] != prev)
memset(bit_alloc_stages, 3, AC3_MAX_CHANNELS);
}
}
s->num_exp_groups[ch], s->dexps[ch][0],
&s->dexps[ch][s->start_freq[ch]+!!ch])) {
av_log(s->avctx, AV_LOG_ERROR, "exponent out-of-range\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
- if(ch != CPL_CH && ch != s->lfe_ch)
+ if (ch != CPL_CH && ch != s->lfe_ch)
skip_bits(gbc, 2); /* skip gainrng */
}
}
s->bit_alloc_params.slow_gain = ff_ac3_slow_gain_tab[get_bits(gbc, 2)];
s->bit_alloc_params.db_per_bit = ff_ac3_db_per_bit_tab[get_bits(gbc, 2)];
s->bit_alloc_params.floor = ff_ac3_floor_tab[get_bits(gbc, 3)];
- for(ch=!cpl_in_use; ch<=s->channels; ch++)
+ for (ch = !cpl_in_use; ch <= s->channels; ch++)
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
} else if (!blk) {
- av_log(s->avctx, AV_LOG_ERROR, "new bit allocation info must be present in block 0\n");
- return -1;
+ av_log(s->avctx, AV_LOG_ERROR, "new bit allocation info must "
+ "be present in block 0\n");
+ return AVERROR_INVALIDDATA;
}
}
/* signal-to-noise ratio offsets and fast gains (signal-to-mask ratios) */
- if(!s->eac3 || !blk){
- if(s->snr_offset_strategy && get_bits1(gbc)) {
+ if (!s->eac3 || !blk) {
+ if (s->snr_offset_strategy && get_bits1(gbc)) {
int snr = 0;
int csnr;
csnr = (get_bits(gbc, 6) - 15) << 4;
if (ch == i || s->snr_offset_strategy == 2)
snr = (csnr + get_bits(gbc, 4)) << 2;
/* run at least last bit allocation stage if snr offset changes */
- if(blk && s->snr_offset[ch] != snr) {
+ if (blk && s->snr_offset[ch] != snr) {
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 1);
}
s->snr_offset[ch] = snr;
int prev = s->fast_gain[ch];
s->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gbc, 3)];
/* run last 2 bit allocation stages if fast gain changes */
- if(blk && prev != s->fast_gain[ch])
+ if (blk && prev != s->fast_gain[ch])
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
}
}
} else if (!s->eac3 && !blk) {
av_log(s->avctx, AV_LOG_ERROR, "new snr offsets must be present in block 0\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
}
int prev = s->fast_gain[ch];
s->fast_gain[ch] = ff_ac3_fast_gain_tab[get_bits(gbc, 3)];
/* run last 2 bit allocation stages if fast gain changes */
- if(blk && prev != s->fast_gain[ch])
+ if (blk && prev != s->fast_gain[ch])
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
}
} else if (s->eac3 && !blk) {
int sl = get_bits(gbc, 3);
/* run last 2 bit allocation stages for coupling channel if
coupling leak changes */
- if(blk && (fl != s->bit_alloc_params.cpl_fast_leak ||
- sl != s->bit_alloc_params.cpl_slow_leak)) {
+ if (blk && (fl != s->bit_alloc_params.cpl_fast_leak ||
+ sl != s->bit_alloc_params.cpl_slow_leak)) {
bit_alloc_stages[CPL_CH] = FFMAX(bit_alloc_stages[CPL_CH], 2);
}
s->bit_alloc_params.cpl_fast_leak = fl;
s->bit_alloc_params.cpl_slow_leak = sl;
} else if (!s->eac3 && !blk) {
- av_log(s->avctx, AV_LOG_ERROR, "new coupling leak info must be present in block 0\n");
- return -1;
+ av_log(s->avctx, AV_LOG_ERROR, "new coupling leak info must "
+ "be present in block 0\n");
+ return AVERROR_INVALIDDATA;
}
s->first_cpl_leak = 0;
}
s->dba_mode[ch] = get_bits(gbc, 2);
if (s->dba_mode[ch] == DBA_RESERVED) {
av_log(s->avctx, AV_LOG_ERROR, "delta bit allocation strategy reserved\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
}
/* channel delta offset, len and bit allocation */
for (ch = !cpl_in_use; ch <= fbw_channels; ch++) {
if (s->dba_mode[ch] == DBA_NEW) {
- s->dba_nsegs[ch] = get_bits(gbc, 3);
- for (seg = 0; seg <= s->dba_nsegs[ch]; seg++) {
+ s->dba_nsegs[ch] = get_bits(gbc, 3) + 1;
+ for (seg = 0; seg < s->dba_nsegs[ch]; seg++) {
s->dba_offsets[ch][seg] = get_bits(gbc, 5);
s->dba_lengths[ch][seg] = get_bits(gbc, 4);
- s->dba_values[ch][seg] = get_bits(gbc, 3);
+ s->dba_values[ch][seg] = get_bits(gbc, 3);
}
/* run last 2 bit allocation stages if new dba values */
bit_alloc_stages[ch] = FFMAX(bit_alloc_stages[ch], 2);
}
}
- } else if(blk == 0) {
- for(ch=0; ch<=s->channels; ch++) {
+ } else if (blk == 0) {
+ for (ch = 0; ch <= s->channels; ch++) {
s->dba_mode[ch] = DBA_NONE;
}
}
/* Bit allocation */
- for(ch=!cpl_in_use; ch<=s->channels; ch++) {
- if(bit_alloc_stages[ch] > 2) {
+ for (ch = !cpl_in_use; ch <= s->channels; ch++) {
+ if (bit_alloc_stages[ch] > 2) {
/* Exponent mapping into PSD and PSD integration */
ff_ac3_bit_alloc_calc_psd(s->dexps[ch],
s->start_freq[ch], s->end_freq[ch],
s->psd[ch], s->band_psd[ch]);
}
- if(bit_alloc_stages[ch] > 1) {
+ if (bit_alloc_stages[ch] > 1) {
/* Compute excitation function, Compute masking curve, and
Apply delta bit allocation */
if (ff_ac3_bit_alloc_calc_mask(&s->bit_alloc_params, s->band_psd[ch],
- s->start_freq[ch], s->end_freq[ch],
- s->fast_gain[ch], (ch == s->lfe_ch),
- s->dba_mode[ch], s->dba_nsegs[ch],
+ s->start_freq[ch], s->end_freq[ch],
+ s->fast_gain[ch], (ch == s->lfe_ch),
+ s->dba_mode[ch], s->dba_nsegs[ch],
s->dba_offsets[ch], s->dba_lengths[ch],
- s->dba_values[ch], s->mask[ch])) {
+ s->dba_values[ch], s->mask[ch])) {
av_log(s->avctx, AV_LOG_ERROR, "error in bit allocation\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
}
- if(bit_alloc_stages[ch] > 0) {
+ if (bit_alloc_stages[ch] > 0) {
/* Compute bit allocation */
const uint8_t *bap_tab = s->channel_uses_aht[ch] ?
ff_eac3_hebap_tab : ff_ac3_bap_tab;
- ff_ac3_bit_alloc_calc_bap(s->mask[ch], s->psd[ch],
+ s->ac3dsp.bit_alloc_calc_bap(s->mask[ch], s->psd[ch],
s->start_freq[ch], s->end_freq[ch],
s->snr_offset[ch],
s->bit_alloc_params.floor,
/* unused dummy data */
if (s->skip_syntax && get_bits1(gbc)) {
int skipl = get_bits(gbc, 9);
- while(skipl--)
- skip_bits(gbc, 8);
+ skip_bits_long(gbc, 8 * skipl);
}
/* unpack the transform coefficients
/* TODO: generate enhanced coupling coordinates and uncouple */
/* recover coefficients if rematrixing is in use */
- if(s->channel_mode == AC3_CHMODE_STEREO)
+ if (s->channel_mode == AC3_CHMODE_STEREO)
do_rematrixing(s);
/* apply scaling to coefficients (headroom, dynrng) */
- for(ch=1; ch<=s->channels; ch++) {
- float gain = s->mul_bias / 4194304.0f;
- if(s->channel_mode == AC3_CHMODE_DUALMONO) {
- gain *= s->dynamic_range[2-ch];
+ for (ch = 1; ch <= s->channels; ch++) {
+ float gain = 1.0 / 4194304.0f;
+ if (s->channel_mode == AC3_CHMODE_DUALMONO) {
+ gain *= s->dynamic_range[2 - ch];
} else {
gain *= s->dynamic_range[0];
}
- s->dsp.int32_to_float_fmul_scalar(s->transform_coeffs[ch], s->fixed_coeffs[ch], gain, 256);
+ s->fmt_conv.int32_to_float_fmul_scalar(s->transform_coeffs[ch],
+ s->fixed_coeffs[ch], gain, 256);
}
/* apply spectral extension to high frequency bins */
downmix_output = s->channels != s->out_channels &&
!((s->output_mode & AC3_OUTPUT_LFEON) &&
s->fbw_channels == s->out_channels);
- if(different_transforms) {
+ if (different_transforms) {
/* the delay samples have already been downmixed, so we upmix the delay
samples in order to reconstruct all channels before downmixing. */
- if(s->downmixed) {
+ if (s->downmixed) {
s->downmixed = 0;
ac3_upmix_delay(s);
}
do_imdct(s, s->channels);
- if(downmix_output) {
- s->dsp.ac3_downmix(s->output, s->downmix_coeffs, s->out_channels, s->fbw_channels, 256);
+ if (downmix_output) {
+ ff_ac3dsp_downmix(&s->ac3dsp, s->outptr, s->downmix_coeffs,
+ s->out_channels, s->fbw_channels, 256);
}
} else {
- if(downmix_output) {
- s->dsp.ac3_downmix(s->transform_coeffs+1, s->downmix_coeffs, s->out_channels, s->fbw_channels, 256);
+ if (downmix_output) {
+ ff_ac3dsp_downmix(&s->ac3dsp, s->xcfptr + 1, s->downmix_coeffs,
+ s->out_channels, s->fbw_channels, 256);
}
- if(downmix_output && !s->downmixed) {
+ if (downmix_output && !s->downmixed) {
s->downmixed = 1;
- s->dsp.ac3_downmix(s->delay, s->downmix_coeffs, s->out_channels, s->fbw_channels, 128);
+ ff_ac3dsp_downmix(&s->ac3dsp, s->dlyptr, s->downmix_coeffs,
+ s->out_channels, s->fbw_channels, 128);
}
do_imdct(s, s->out_channels);
/**
* Decode a single AC-3 frame.
*/
-static int ac3_decode_frame(AVCodecContext * avctx, void *data, int *data_size,
- AVPacket *avpkt)
+static int ac3_decode_frame(AVCodecContext * avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
{
+ AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AC3DecodeContext *s = avctx->priv_data;
- int16_t *out_samples = (int16_t *)data;
- int blk, ch, err;
+ int blk, ch, err, ret;
const uint8_t *channel_map;
const float *output[AC3_MAX_CHANNELS];
-
- /* initialize the GetBitContext with the start of valid AC-3 Frame */
- if (s->input_buffer) {
- /* copy input buffer to decoder context to avoid reading past the end
- of the buffer, which can be caused by a damaged input stream. */
+ enum AVMatrixEncoding matrix_encoding;
+ AVDownmixInfo *downmix_info;
+
+ /* copy input buffer to decoder context to avoid reading past the end
+ of the buffer, which can be caused by a damaged input stream. */
+ if (buf_size >= 2 && AV_RB16(buf) == 0x770B) {
+ // seems to be byte-swapped AC-3
+ int cnt = FFMIN(buf_size, AC3_FRAME_BUFFER_SIZE) >> 1;
+ s->bdsp.bswap16_buf((uint16_t *) s->input_buffer,
+ (const uint16_t *) buf, cnt);
+ } else
memcpy(s->input_buffer, buf, FFMIN(buf_size, AC3_FRAME_BUFFER_SIZE));
- init_get_bits(&s->gbc, s->input_buffer, buf_size * 8);
- } else {
- init_get_bits(&s->gbc, buf, buf_size * 8);
- }
+ buf = s->input_buffer;
+ /* initialize the GetBitContext with the start of valid AC-3 Frame */
+ init_get_bits(&s->gbc, buf, buf_size * 8);
/* parse the syncinfo */
- *data_size = 0;
err = parse_frame_header(s);
if (err) {
- switch(err) {
- case AAC_AC3_PARSE_ERROR_SYNC:
- av_log(avctx, AV_LOG_ERROR, "frame sync error\n");
- return -1;
- case AAC_AC3_PARSE_ERROR_BSID:
- av_log(avctx, AV_LOG_ERROR, "invalid bitstream id\n");
- break;
- case AAC_AC3_PARSE_ERROR_SAMPLE_RATE:
- av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
- break;
- case AAC_AC3_PARSE_ERROR_FRAME_SIZE:
- av_log(avctx, AV_LOG_ERROR, "invalid frame size\n");
- break;
- case AAC_AC3_PARSE_ERROR_FRAME_TYPE:
- /* skip frame if CRC is ok. otherwise use error concealment. */
- /* TODO: add support for substreams and dependent frames */
- if(s->frame_type == EAC3_FRAME_TYPE_DEPENDENT || s->substreamid) {
- av_log(avctx, AV_LOG_ERROR, "unsupported frame type : skipping frame\n");
- return s->frame_size;
- } else {
- av_log(avctx, AV_LOG_ERROR, "invalid frame type\n");
- }
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "invalid header\n");
- break;
+ switch (err) {
+ case AAC_AC3_PARSE_ERROR_SYNC:
+ av_log(avctx, AV_LOG_ERROR, "frame sync error\n");
+ return AVERROR_INVALIDDATA;
+ case AAC_AC3_PARSE_ERROR_BSID:
+ av_log(avctx, AV_LOG_ERROR, "invalid bitstream id\n");
+ break;
+ case AAC_AC3_PARSE_ERROR_SAMPLE_RATE:
+ av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
+ break;
+ case AAC_AC3_PARSE_ERROR_FRAME_SIZE:
+ av_log(avctx, AV_LOG_ERROR, "invalid frame size\n");
+ break;
+ case AAC_AC3_PARSE_ERROR_FRAME_TYPE:
+ /* skip frame if CRC is ok. otherwise use error concealment. */
+ /* TODO: add support for substreams and dependent frames */
+ if (s->frame_type == EAC3_FRAME_TYPE_DEPENDENT || s->substreamid) {
+ av_log(avctx, AV_LOG_DEBUG,
+ "unsupported frame type %d: skipping frame\n",
+ s->frame_type);
+ *got_frame_ptr = 0;
+ return buf_size;
+ } else {
+ av_log(avctx, AV_LOG_ERROR, "invalid frame type\n");
+ }
+ break;
+ case AAC_AC3_PARSE_ERROR_CRC:
+ case AAC_AC3_PARSE_ERROR_CHANNEL_CFG:
+ break;
+ default: // Normal AVERROR do not try to recover.
+ *got_frame_ptr = 0;
+ return err;
}
} else {
/* check that reported frame size fits in input buffer */
if (s->frame_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "incomplete frame\n");
err = AAC_AC3_PARSE_ERROR_FRAME_SIZE;
- } else if (avctx->error_recognition >= FF_ER_CAREFUL) {
+ } else if (avctx->err_recognition & AV_EF_CRCCHECK) {
/* check for crc mismatch */
- if (av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, &buf[2], s->frame_size-2)) {
+ if (av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, &buf[2],
+ s->frame_size - 2)) {
av_log(avctx, AV_LOG_ERROR, "frame CRC mismatch\n");
+ if (avctx->err_recognition & AV_EF_EXPLODE)
+ return AVERROR_INVALIDDATA;
err = AAC_AC3_PARSE_ERROR_CRC;
}
}
/* if frame is ok, set audio parameters */
if (!err) {
avctx->sample_rate = s->sample_rate;
- avctx->bit_rate = s->bit_rate;
+ avctx->bit_rate = s->bit_rate;
+ }
- /* channel config */
+ /* channel config */
+ if (!err || (s->channels && s->out_channels != s->channels)) {
s->out_channels = s->channels;
- s->output_mode = s->channel_mode;
- if(s->lfe_on)
+ s->output_mode = s->channel_mode;
+ if (s->lfe_on)
s->output_mode |= AC3_OUTPUT_LFEON;
- if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
- avctx->request_channels < s->channels) {
- s->out_channels = avctx->request_channels;
- s->output_mode = avctx->request_channels == 1 ? AC3_CHMODE_MONO : AC3_CHMODE_STEREO;
- s->channel_layout = ff_ac3_channel_layout_tab[s->output_mode];
+ if (s->channels > 1 &&
+ avctx->request_channel_layout == AV_CH_LAYOUT_MONO) {
+ s->out_channels = 1;
+ s->output_mode = AC3_CHMODE_MONO;
+ } else if (s->channels > 2 &&
+ avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) {
+ s->out_channels = 2;
+ s->output_mode = AC3_CHMODE_STEREO;
}
- avctx->channels = s->out_channels;
- avctx->channel_layout = s->channel_layout;
/* set downmixing coefficients if needed */
- if(s->channels != s->out_channels && !((s->output_mode & AC3_OUTPUT_LFEON) &&
+ if (s->channels != s->out_channels && !((s->output_mode & AC3_OUTPUT_LFEON) &&
s->fbw_channels == s->out_channels)) {
- set_downmix_coeffs(s);
+ if ((ret = set_downmix_coeffs(s)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "error setting downmix coeffs\n");
+ return ret;
+ }
}
- } else if (!s->out_channels) {
- s->out_channels = avctx->channels;
- if(s->out_channels < s->channels)
- s->output_mode = s->out_channels == 1 ? AC3_CHMODE_MONO : AC3_CHMODE_STEREO;
+ } else if (!s->channels) {
+ av_log(avctx, AV_LOG_ERROR, "unable to determine channel mode\n");
+ return AVERROR_INVALIDDATA;
+ }
+ avctx->channels = s->out_channels;
+ avctx->channel_layout = avpriv_ac3_channel_layout_tab[s->output_mode & ~AC3_OUTPUT_LFEON];
+ if (s->output_mode & AC3_OUTPUT_LFEON)
+ avctx->channel_layout |= AV_CH_LOW_FREQUENCY;
+
+ /* set audio service type based on bitstream mode for AC-3 */
+ avctx->audio_service_type = s->bitstream_mode;
+ if (s->bitstream_mode == 0x7 && s->channels > 1)
+ avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
+
+ /* get output buffer */
+ frame->nb_samples = s->num_blocks * AC3_BLOCK_SIZE;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
/* decode the audio blocks */
channel_map = ff_ac3_dec_channel_map[s->output_mode & ~AC3_OUTPUT_LFEON][s->lfe_on];
- for (ch = 0; ch < s->out_channels; ch++)
- output[ch] = s->output[channel_map[ch]];
+ for (ch = 0; ch < s->channels; ch++) {
+ if (ch < s->out_channels)
+ s->outptr[channel_map[ch]] = (float *)frame->data[ch];
+ else
+ s->outptr[ch] = s->output[ch];
+ output[ch] = s->output[ch];
+ }
for (blk = 0; blk < s->num_blocks; blk++) {
if (!err && decode_audio_block(s, blk)) {
av_log(avctx, AV_LOG_ERROR, "error decoding the audio block\n");
err = 1;
}
- s->dsp.float_to_int16_interleave(out_samples, output, 256, s->out_channels);
- out_samples += 256 * s->out_channels;
+ if (err)
+ for (ch = 0; ch < s->out_channels; ch++)
+ memcpy(s->outptr[channel_map[ch]], output[ch], sizeof(**output) * AC3_BLOCK_SIZE);
+ for (ch = 0; ch < s->out_channels; ch++)
+ output[ch] = s->outptr[channel_map[ch]];
+ for (ch = 0; ch < s->out_channels; ch++)
+ s->outptr[ch] += AC3_BLOCK_SIZE;
+ }
+
+ /* keep last block for error concealment in next frame */
+ for (ch = 0; ch < s->out_channels; ch++)
+ memcpy(s->output[ch], output[ch], sizeof(**output) * AC3_BLOCK_SIZE);
+
+ /*
+ * AVMatrixEncoding
+ *
+ * Check whether the input layout is compatible, and make sure we're not
+ * downmixing (else the matrix encoding is no longer applicable).
+ */
+ matrix_encoding = AV_MATRIX_ENCODING_NONE;
+ if (s->channel_mode == AC3_CHMODE_STEREO &&
+ s->channel_mode == (s->output_mode & ~AC3_OUTPUT_LFEON)) {
+ if (s->dolby_surround_mode == AC3_DSURMOD_ON)
+ matrix_encoding = AV_MATRIX_ENCODING_DOLBY;
+ else if (s->dolby_headphone_mode == AC3_DHEADPHONMOD_ON)
+ matrix_encoding = AV_MATRIX_ENCODING_DOLBYHEADPHONE;
+ } else if (s->channel_mode >= AC3_CHMODE_2F2R &&
+ s->channel_mode == (s->output_mode & ~AC3_OUTPUT_LFEON)) {
+ switch (s->dolby_surround_ex_mode) {
+ case AC3_DSUREXMOD_ON: // EX or PLIIx
+ matrix_encoding = AV_MATRIX_ENCODING_DOLBYEX;
+ break;
+ case AC3_DSUREXMOD_PLIIZ:
+ matrix_encoding = AV_MATRIX_ENCODING_DPLIIZ;
+ break;
+ default: // not indicated or off
+ break;
+ }
}
- *data_size = s->num_blocks * 256 * avctx->channels * sizeof (int16_t);
+ if ((ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
+ return ret;
+
+ /* AVDownmixInfo */
+ if ((downmix_info = av_downmix_info_update_side_data(frame))) {
+ switch (s->preferred_downmix) {
+ case AC3_DMIXMOD_LTRT:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LTRT;
+ break;
+ case AC3_DMIXMOD_LORO:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LORO;
+ break;
+ case AC3_DMIXMOD_DPLII:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_DPLII;
+ break;
+ default:
+ downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_UNKNOWN;
+ break;
+ }
+ downmix_info->center_mix_level = gain_levels[s-> center_mix_level];
+ downmix_info->center_mix_level_ltrt = gain_levels[s-> center_mix_level_ltrt];
+ downmix_info->surround_mix_level = gain_levels[s-> surround_mix_level];
+ downmix_info->surround_mix_level_ltrt = gain_levels[s->surround_mix_level_ltrt];
+ if (s->lfe_mix_level_exists)
+ downmix_info->lfe_mix_level = gain_levels_lfe[s->lfe_mix_level];
+ else
+ downmix_info->lfe_mix_level = 0.0; // -inf dB
+ } else
+ return AVERROR(ENOMEM);
+
+ *got_frame_ptr = 1;
+
return FFMIN(buf_size, s->frame_size);
}
AC3DecodeContext *s = avctx->priv_data;
ff_mdct_end(&s->imdct_512);
ff_mdct_end(&s->imdct_256);
-
- av_freep(&s->input_buffer);
+ av_freep(&s->downmix_coeffs[0]);
return 0;
}
-AVCodec ac3_decoder = {
- .name = "ac3",
- .type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_AC3,
+#define OFFSET(x) offsetof(AC3DecodeContext, x)
+#define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
+static const AVOption options[] = {
+ { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
+ { NULL},
+};
+
+static const AVClass ac3_decoder_class = {
+ .class_name = "AC3 decoder",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_ac3_decoder = {
+ .name = "ac3",
+ .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_AC3,
.priv_data_size = sizeof (AC3DecodeContext),
- .init = ac3_decode_init,
- .close = ac3_decode_end,
- .decode = ac3_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
+ .init = ac3_decode_init,
+ .close = ac3_decode_end,
+ .decode = ac3_decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
+ .priv_class = &ac3_decoder_class,
};
#if CONFIG_EAC3_DECODER
-AVCodec eac3_decoder = {
- .name = "eac3",
- .type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_EAC3,
+static const AVClass eac3_decoder_class = {
+ .class_name = "E-AC3 decoder",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_eac3_decoder = {
+ .name = "eac3",
+ .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_EAC3,
.priv_data_size = sizeof (AC3DecodeContext),
- .init = ac3_decode_init,
- .close = ac3_decode_end,
- .decode = ac3_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"),
+ .init = ac3_decode_init,
+ .close = ac3_decode_end,
+ .decode = ac3_decode_frame,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
+ .priv_class = &eac3_decoder_class,
};
#endif
projects / ffmpeg / blobdiff