#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"
LEVEL_MINUS_9DB
};
+/** 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
* reference: Section 7.8.2 Downmixing Into Two Channels
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);
- ff_dsputil_init(&s->dsp, avctx);
- avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT);
- ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT);
+ 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);
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;
for (i = 0; i < AC3_MAX_CHANNELS; i++) {
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)) {
/* 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->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;
* 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[s-> center_mix_level];
float smix = gain_levels[s->surround_mix_level];
float norm0, norm1;
+ 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[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]];
+ 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;
+ s->downmix_coeffs[0][1] = s->downmix_coeffs[1][1] = cmix;
}
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) {
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];
+ 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;
+ 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;
+ s->downmix_coeffs[0][i] = (s->downmix_coeffs[0][i] +
+ s->downmix_coeffs[1][i]) * LEVEL_MINUS_3DB;
}
+
+ return 0;
}
/**
/**
* 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 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;
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;
i = !s->channel_mode;
do {
if (get_bits1(gbc)) {
- s->dynamic_range[i] = ((dynamic_range_tab[get_bits(gbc, 8)] - 1.0) *
- s->drc_scale) + 1.0;
+ /* 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;
}
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 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(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 AVERROR_INVALIDDATA;
- }
-
- /* check for enhanced coupling */
- if (s->eac3 && get_bits1(gbc)) {
- /* 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(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 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(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 "
/* 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 AVERROR_INVALIDDATA;
- }
- } 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 */
/* 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
do_imdct(s, s->channels);
if (downmix_output) {
- s->ac3dsp.downmix(s->outptr, s->downmix_coeffs,
+ ff_ac3dsp_downmix(&s->ac3dsp, s->outptr, s->downmix_coeffs,
s->out_channels, s->fbw_channels, 256);
}
} else {
if (downmix_output) {
- s->ac3dsp.downmix(s->xcfptr + 1, s->downmix_coeffs,
+ ff_ac3dsp_downmix(&s->ac3dsp, s->xcfptr + 1, s->downmix_coeffs,
s->out_channels, s->fbw_channels, 256);
}
if (downmix_output && !s->downmixed) {
s->downmixed = 1;
- s->ac3dsp.downmix(s->dlyptr, 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);
int blk, ch, err, ret;
const uint8_t *channel_map;
const float *output[AC3_MAX_CHANNELS];
+ 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->dsp.bswap16_buf((uint16_t *)s->input_buffer, (const uint16_t *)buf, cnt);
+ 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));
buf = s->input_buffer;
/* 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_WARNING, "unsupported frame type : "
- "skipping frame\n");
+ av_log(avctx, AV_LOG_DEBUG,
+ "unsupported frame type %d: skipping frame\n",
+ s->frame_type);
*got_frame_ptr = 0;
return buf_size;
} else {
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;
}
}
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 = avpriv_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) &&
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->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;
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->channels; ch++)
+ for (ch = 0; ch < s->out_channels; ch++)
s->outptr[ch] += AC3_BLOCK_SIZE;
}
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;
+ }
+ }
+ 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->downmix_coeffs[0]);
return 0;
}
#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, 1.0, PAR },
+ { "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},
};
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,
- .capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
+ .capabilities = AV_CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
.priv_class = &ac3_decoder_class,
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,
- .capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52B (AC-3, E-AC-3)"),
+ .capabilities = AV_CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_NONE },
.priv_class = &eac3_decoder_class,
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