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