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ffmpeg/libavcodec/dca_exss.c

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/*
* DCA ExSS extension
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "libavutil/log.h"
#include "dca.h"
#include "dca_syncwords.h"
#include "get_bits.h"
/* extensions that reside in core substream */
#define DCA_CORE_EXTS (DCA_EXT_XCH | DCA_EXT_XXCH | DCA_EXT_X96)
/* these are unconfirmed but should be mostly correct */
enum DCAExSSSpeakerMask {
DCA_EXSS_FRONT_CENTER = 0x0001,
DCA_EXSS_FRONT_LEFT_RIGHT = 0x0002,
DCA_EXSS_SIDE_REAR_LEFT_RIGHT = 0x0004,
DCA_EXSS_LFE = 0x0008,
DCA_EXSS_REAR_CENTER = 0x0010,
DCA_EXSS_FRONT_HIGH_LEFT_RIGHT = 0x0020,
DCA_EXSS_REAR_LEFT_RIGHT = 0x0040,
DCA_EXSS_FRONT_HIGH_CENTER = 0x0080,
DCA_EXSS_OVERHEAD = 0x0100,
DCA_EXSS_CENTER_LEFT_RIGHT = 0x0200,
DCA_EXSS_WIDE_LEFT_RIGHT = 0x0400,
DCA_EXSS_SIDE_LEFT_RIGHT = 0x0800,
DCA_EXSS_LFE2 = 0x1000,
DCA_EXSS_SIDE_HIGH_LEFT_RIGHT = 0x2000,
DCA_EXSS_REAR_HIGH_CENTER = 0x4000,
DCA_EXSS_REAR_HIGH_LEFT_RIGHT = 0x8000,
};
/**
* Return the number of channels in an ExSS speaker mask (HD)
*/
static int dca_exss_mask2count(int mask)
{
/* count bits that mean speaker pairs twice */
return av_popcount(mask) +
av_popcount(mask & (DCA_EXSS_CENTER_LEFT_RIGHT |
DCA_EXSS_FRONT_LEFT_RIGHT |
DCA_EXSS_FRONT_HIGH_LEFT_RIGHT |
DCA_EXSS_WIDE_LEFT_RIGHT |
DCA_EXSS_SIDE_LEFT_RIGHT |
DCA_EXSS_SIDE_HIGH_LEFT_RIGHT |
DCA_EXSS_SIDE_REAR_LEFT_RIGHT |
DCA_EXSS_REAR_LEFT_RIGHT |
DCA_EXSS_REAR_HIGH_LEFT_RIGHT));
}
/**
* Skip mixing coefficients of a single mix out configuration (HD)
*/
static void dca_exss_skip_mix_coeffs(GetBitContext *gb, int channels, int out_ch)
{
int i;
for (i = 0; i < channels; i++) {
int mix_map_mask = get_bits(gb, out_ch);
int num_coeffs = av_popcount(mix_map_mask);
skip_bits_long(gb, num_coeffs * 6);
}
}
/**
* Parse extension substream asset header (HD)
*/
static int dca_exss_parse_asset_header(DCAContext *s)
{
int header_pos = get_bits_count(&s->gb);
int header_size;
int channels = 0;
int embedded_stereo = 0;
int embedded_6ch = 0;
int drc_code_present;
int extensions_mask = 0;
int i, j;
if (get_bits_left(&s->gb) < 16)
return AVERROR_INVALIDDATA;
/* We will parse just enough to get to the extensions bitmask with which
* we can set the profile value. */
header_size = get_bits(&s->gb, 9) + 1;
skip_bits(&s->gb, 3); // asset index
if (s->static_fields) {
if (get_bits1(&s->gb))
skip_bits(&s->gb, 4); // asset type descriptor
if (get_bits1(&s->gb))
skip_bits_long(&s->gb, 24); // language descriptor
if (get_bits1(&s->gb)) {
/* How can one fit 1024 bytes of text here if the maximum value
* for the asset header size field above was 512 bytes? */
int text_length = get_bits(&s->gb, 10) + 1;
if (get_bits_left(&s->gb) < text_length * 8)
return AVERROR_INVALIDDATA;
skip_bits_long(&s->gb, text_length * 8); // info text
}
skip_bits(&s->gb, 5); // bit resolution - 1
skip_bits(&s->gb, 4); // max sample rate code
channels = get_bits(&s->gb, 8) + 1;
s->one2one_map_chtospkr = get_bits1(&s->gb);
if (s->one2one_map_chtospkr) {
int spkr_remap_sets;
int spkr_mask_size = 16;
int num_spkrs[7];
if (channels > 2)
embedded_stereo = get_bits1(&s->gb);
if (channels > 6)
embedded_6ch = get_bits1(&s->gb);
if (get_bits1(&s->gb)) {
spkr_mask_size = (get_bits(&s->gb, 2) + 1) << 2;
skip_bits(&s->gb, spkr_mask_size); // spkr activity mask
}
spkr_remap_sets = get_bits(&s->gb, 3);
for (i = 0; i < spkr_remap_sets; i++) {
/* std layout mask for each remap set */
num_spkrs[i] = dca_exss_mask2count(get_bits(&s->gb, spkr_mask_size));
}
for (i = 0; i < spkr_remap_sets; i++) {
int num_dec_ch_remaps = get_bits(&s->gb, 5) + 1;
if (get_bits_left(&s->gb) < 0)
return AVERROR_INVALIDDATA;
for (j = 0; j < num_spkrs[i]; j++) {
int remap_dec_ch_mask = get_bits_long(&s->gb, num_dec_ch_remaps);
int num_dec_ch = av_popcount(remap_dec_ch_mask);
skip_bits_long(&s->gb, num_dec_ch * 5); // remap codes
}
}
} else {
skip_bits(&s->gb, 3); // representation type
}
}
drc_code_present = get_bits1(&s->gb);
if (drc_code_present)
get_bits(&s->gb, 8); // drc code
if (get_bits1(&s->gb))
skip_bits(&s->gb, 5); // dialog normalization code
if (drc_code_present && embedded_stereo)
get_bits(&s->gb, 8); // drc stereo code
if (s->mix_metadata && get_bits1(&s->gb)) {
skip_bits(&s->gb, 1); // external mix
skip_bits(&s->gb, 6); // post mix gain code
if (get_bits(&s->gb, 2) != 3) // mixer drc code
skip_bits(&s->gb, 3); // drc limit
else
skip_bits(&s->gb, 8); // custom drc code
if (get_bits1(&s->gb)) // channel specific scaling
for (i = 0; i < s->num_mix_configs; i++)
skip_bits_long(&s->gb, s->mix_config_num_ch[i] * 6); // scale codes
else
skip_bits_long(&s->gb, s->num_mix_configs * 6); // scale codes
for (i = 0; i < s->num_mix_configs; i++) {
if (get_bits_left(&s->gb) < 0)
return AVERROR_INVALIDDATA;
dca_exss_skip_mix_coeffs(&s->gb, channels, s->mix_config_num_ch[i]);
if (embedded_6ch)
dca_exss_skip_mix_coeffs(&s->gb, 6, s->mix_config_num_ch[i]);
if (embedded_stereo)
dca_exss_skip_mix_coeffs(&s->gb, 2, s->mix_config_num_ch[i]);
}
}
switch (get_bits(&s->gb, 2)) {
case 0:
extensions_mask = get_bits(&s->gb, 12);
break;
case 1:
extensions_mask = DCA_EXT_EXSS_XLL;
break;
case 2:
extensions_mask = DCA_EXT_EXSS_LBR;
break;
case 3:
extensions_mask = 0; /* aux coding */
break;
}
/* not parsed further, we were only interested in the extensions mask */
if (get_bits_left(&s->gb) < 0)
return AVERROR_INVALIDDATA;
if (get_bits_count(&s->gb) - header_pos > header_size * 8) {
av_log(s->avctx, AV_LOG_WARNING, "Asset header size mismatch.\n");
return AVERROR_INVALIDDATA;
}
skip_bits_long(&s->gb, header_pos + header_size * 8 - get_bits_count(&s->gb));
if (extensions_mask & DCA_EXT_EXSS_XLL)
s->profile = FF_PROFILE_DTS_HD_MA;
else if (extensions_mask & (DCA_EXT_EXSS_XBR | DCA_EXT_EXSS_X96 |
DCA_EXT_EXSS_XXCH))
s->profile = FF_PROFILE_DTS_HD_HRA;
if (!(extensions_mask & DCA_EXT_CORE))
av_log(s->avctx, AV_LOG_WARNING, "DTS core detection mismatch.\n");
if ((extensions_mask & DCA_CORE_EXTS) != s->core_ext_mask)
av_log(s->avctx, AV_LOG_WARNING,
"DTS extensions detection mismatch (%d, %d)\n",
extensions_mask & DCA_CORE_EXTS, s->core_ext_mask);
return 0;
}
/**
* Parse extension substream header (HD)
*/
void ff_dca_exss_parse_header(DCAContext *s)
{
int asset_size[8];
int ss_index;
int blownup;
int num_audiop = 1;
int num_assets = 1;
int active_ss_mask[8];
int i, j;
int start_pos;
int hdrsize;
uint32_t mkr;
if (get_bits_left(&s->gb) < 52)
return;
start_pos = get_bits_count(&s->gb) - 32;
skip_bits(&s->gb, 8); // user data
ss_index = get_bits(&s->gb, 2);
blownup = get_bits1(&s->gb);
hdrsize = get_bits(&s->gb, 8 + 4 * blownup) + 1; // header_size
skip_bits(&s->gb, 16 + 4 * blownup); // hd_size
s->static_fields = get_bits1(&s->gb);
if (s->static_fields) {
skip_bits(&s->gb, 2); // reference clock code
skip_bits(&s->gb, 3); // frame duration code
if (get_bits1(&s->gb))
skip_bits_long(&s->gb, 36); // timestamp
/* a single stream can contain multiple audio assets that can be
* combined to form multiple audio presentations */
num_audiop = get_bits(&s->gb, 3) + 1;
if (num_audiop > 1) {
avpriv_request_sample(s->avctx,
"Multiple DTS-HD audio presentations");
/* ignore such streams for now */
return;
}
num_assets = get_bits(&s->gb, 3) + 1;
if (num_assets > 1) {
avpriv_request_sample(s->avctx, "Multiple DTS-HD audio assets");
/* ignore such streams for now */
return;
}
for (i = 0; i < num_audiop; i++)
active_ss_mask[i] = get_bits(&s->gb, ss_index + 1);
for (i = 0; i < num_audiop; i++)
for (j = 0; j <= ss_index; j++)
if (active_ss_mask[i] & (1 << j))
skip_bits(&s->gb, 8); // active asset mask
s->mix_metadata = get_bits1(&s->gb);
if (s->mix_metadata) {
int mix_out_mask_size;
skip_bits(&s->gb, 2); // adjustment level
mix_out_mask_size = (get_bits(&s->gb, 2) + 1) << 2;
s->num_mix_configs = get_bits(&s->gb, 2) + 1;
for (i = 0; i < s->num_mix_configs; i++) {
int mix_out_mask = get_bits(&s->gb, mix_out_mask_size);
s->mix_config_num_ch[i] = dca_exss_mask2count(mix_out_mask);
}
}
}
for (i = 0; i < num_assets; i++)
asset_size[i] = get_bits_long(&s->gb, 16 + 4 * blownup) + 1;
for (i = 0; i < num_assets; i++) {
if (dca_exss_parse_asset_header(s))
return;
}
if (num_assets > 0) {
j = get_bits_count(&s->gb);
if (start_pos + hdrsize * 8 > j)
skip_bits_long(&s->gb, start_pos + hdrsize * 8 - j);
for (i = 0; i < num_assets; i++) {
int end_pos;
start_pos = get_bits_count(&s->gb);
end_pos = start_pos + asset_size[i] * 8;
mkr = get_bits_long(&s->gb, 32);
/* parse extensions that we know about */
switch (mkr) {
case DCA_SYNCWORD_XLL:
if (s->xll_disable) {
av_log(s->avctx, AV_LOG_DEBUG,
"DTS-XLL: ignoring XLL extension\n");
break;
}
av_log(s->avctx, AV_LOG_DEBUG,
"DTS-XLL: decoding XLL extension\n");
if (ff_dca_xll_decode_header(s) == 0 &&
ff_dca_xll_decode_navi(s, end_pos) == 0)
s->exss_ext_mask |= DCA_EXT_EXSS_XLL;
break;
case DCA_SYNCWORD_XBR:
case DCA_SYNCWORD_XXCH:
default:
av_log(s->avctx, AV_LOG_VERBOSE,
"DTS-ExSS: unknown marker = 0x%08"PRIx32"\n", mkr);
}
/* skip to end of block */
j = get_bits_count(&s->gb);
if (j > end_pos)
av_log(s->avctx, AV_LOG_ERROR,
"DTS-ExSS: Processed asset too long.\n");
if (j < end_pos)
skip_bits_long(&s->gb, end_pos - j);
}
}
}
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