515 lines
16 KiB
C
515 lines
16 KiB
C
/*
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* Copyright (C) 2016 foo86
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "dcadec.h"
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static void parse_xll_parameters(DCAExssParser *s, DCAExssAsset *asset)
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{
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// Size of XLL data in extension substream
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asset->xll_size = get_bits(&s->gb, s->exss_size_nbits) + 1;
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// XLL sync word present flag
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if (asset->xll_sync_present = get_bits1(&s->gb)) {
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int xll_delay_nbits;
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// Peak bit rate smoothing buffer size
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skip_bits(&s->gb, 4);
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// Number of bits for XLL decoding delay
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xll_delay_nbits = get_bits(&s->gb, 5) + 1;
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// Initial XLL decoding delay in frames
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asset->xll_delay_nframes = get_bits_long(&s->gb, xll_delay_nbits);
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// Number of bytes offset to XLL sync
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asset->xll_sync_offset = get_bits(&s->gb, s->exss_size_nbits);
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} else {
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asset->xll_delay_nframes = 0;
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asset->xll_sync_offset = 0;
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}
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}
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static void parse_lbr_parameters(DCAExssParser *s, DCAExssAsset *asset)
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{
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// Size of LBR component in extension substream
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asset->lbr_size = get_bits(&s->gb, 14) + 1;
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// LBR sync word present flag
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if (get_bits1(&s->gb))
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// LBR sync distance
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skip_bits(&s->gb, 2);
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}
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static int parse_descriptor(DCAExssParser *s, DCAExssAsset *asset)
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{
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int i, j, drc_present, descr_size, descr_pos = get_bits_count(&s->gb);
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// Size of audio asset descriptor in bytes
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descr_size = get_bits(&s->gb, 9) + 1;
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// Audio asset identifier
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asset->asset_index = get_bits(&s->gb, 3);
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//
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// Per stream static metadata
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//
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if (s->static_fields_present) {
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// Asset type descriptor presence
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if (get_bits1(&s->gb))
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// Asset type descriptor
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skip_bits(&s->gb, 4);
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// Language descriptor presence
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if (get_bits1(&s->gb))
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// Language descriptor
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skip_bits(&s->gb, 24);
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// Additional textual information presence
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if (get_bits1(&s->gb)) {
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// Byte size of additional text info
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int text_size = get_bits(&s->gb, 10) + 1;
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// Sanity check available size
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if (get_bits_left(&s->gb) < text_size * 8)
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return AVERROR_INVALIDDATA;
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// Additional textual information string
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skip_bits_long(&s->gb, text_size * 8);
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}
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// PCM bit resolution
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asset->pcm_bit_res = get_bits(&s->gb, 5) + 1;
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// Maximum sample rate
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asset->max_sample_rate = ff_dca_sampling_freqs[get_bits(&s->gb, 4)];
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// Total number of channels
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asset->nchannels_total = get_bits(&s->gb, 8) + 1;
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// One to one map channel to speakers
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if (asset->one_to_one_map_ch_to_spkr = get_bits1(&s->gb)) {
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int spkr_mask_nbits = 0;
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int spkr_remap_nsets;
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int nspeakers[8];
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// Embedded stereo flag
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asset->embedded_stereo = asset->nchannels_total > 2 && get_bits1(&s->gb);
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// Embedded 6 channels flag
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asset->embedded_6ch = asset->nchannels_total > 6 && get_bits1(&s->gb);
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// Speaker mask enabled flag
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if (asset->spkr_mask_enabled = get_bits1(&s->gb)) {
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// Number of bits for speaker activity mask
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spkr_mask_nbits = (get_bits(&s->gb, 2) + 1) << 2;
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// Loudspeaker activity mask
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asset->spkr_mask = get_bits(&s->gb, spkr_mask_nbits);
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}
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// Number of speaker remapping sets
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if ((spkr_remap_nsets = get_bits(&s->gb, 3)) && !spkr_mask_nbits) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "Speaker mask disabled yet there are remapping sets\n");
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return AVERROR_INVALIDDATA;
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}
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// Standard loudspeaker layout mask
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for (i = 0; i < spkr_remap_nsets; i++)
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nspeakers[i] = ff_dca_count_chs_for_mask(get_bits(&s->gb, spkr_mask_nbits));
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for (i = 0; i < spkr_remap_nsets; i++) {
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// Number of channels to be decoded for speaker remapping
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int nch_for_remaps = get_bits(&s->gb, 5) + 1;
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for (j = 0; j < nspeakers[i]; j++) {
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// Decoded channels to output speaker mapping mask
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int remap_ch_mask = get_bits_long(&s->gb, nch_for_remaps);
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// Loudspeaker remapping codes
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skip_bits_long(&s->gb, av_popcount(remap_ch_mask) * 5);
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}
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}
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} else {
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asset->embedded_stereo = 0;
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asset->embedded_6ch = 0;
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asset->spkr_mask_enabled = 0;
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asset->spkr_mask = 0;
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// Representation type
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asset->representation_type = get_bits(&s->gb, 3);
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}
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}
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//
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// DRC, DNC and mixing metadata
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//
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// Dynamic range coefficient presence flag
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drc_present = get_bits1(&s->gb);
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// Code for dynamic range coefficient
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if (drc_present)
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skip_bits(&s->gb, 8);
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// Dialog normalization presence flag
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if (get_bits1(&s->gb))
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// Dialog normalization code
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skip_bits(&s->gb, 5);
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// DRC for stereo downmix
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if (drc_present && asset->embedded_stereo)
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skip_bits(&s->gb, 8);
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// Mixing metadata presence flag
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if (s->mix_metadata_enabled && get_bits1(&s->gb)) {
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int nchannels_dmix;
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// External mixing flag
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skip_bits1(&s->gb);
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// Post mixing / replacement gain adjustment
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skip_bits(&s->gb, 6);
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// DRC prior to mixing
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if (get_bits(&s->gb, 2) == 3)
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// Custom code for mixing DRC
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skip_bits(&s->gb, 8);
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else
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// Limit for mixing DRC
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skip_bits(&s->gb, 3);
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// Scaling type for channels of main audio
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// Scaling parameters of main audio
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if (get_bits1(&s->gb))
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for (i = 0; i < s->nmixoutconfigs; i++)
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skip_bits_long(&s->gb, 6 * s->nmixoutchs[i]);
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else
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skip_bits_long(&s->gb, 6 * s->nmixoutconfigs);
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nchannels_dmix = asset->nchannels_total;
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if (asset->embedded_6ch)
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nchannels_dmix += 6;
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if (asset->embedded_stereo)
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nchannels_dmix += 2;
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for (i = 0; i < s->nmixoutconfigs; i++) {
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if (!s->nmixoutchs[i]) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "Invalid speaker layout mask for mixing configuration\n");
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return AVERROR_INVALIDDATA;
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}
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for (j = 0; j < nchannels_dmix; j++) {
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// Mix output mask
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int mix_map_mask = get_bits(&s->gb, s->nmixoutchs[i]);
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// Mixing coefficients
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skip_bits_long(&s->gb, av_popcount(mix_map_mask) * 6);
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}
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}
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}
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//
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// Decoder navigation data
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//
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// Coding mode for the asset
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asset->coding_mode = get_bits(&s->gb, 2);
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// Coding components used in asset
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switch (asset->coding_mode) {
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case 0: // Coding mode that may contain multiple coding components
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asset->extension_mask = get_bits(&s->gb, 12);
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if (asset->extension_mask & DCA_EXSS_CORE) {
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// Size of core component in extension substream
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asset->core_size = get_bits(&s->gb, 14) + 1;
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// Core sync word present flag
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if (get_bits1(&s->gb))
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// Core sync distance
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skip_bits(&s->gb, 2);
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}
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if (asset->extension_mask & DCA_EXSS_XBR)
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// Size of XBR extension in extension substream
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asset->xbr_size = get_bits(&s->gb, 14) + 1;
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if (asset->extension_mask & DCA_EXSS_XXCH)
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// Size of XXCH extension in extension substream
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asset->xxch_size = get_bits(&s->gb, 14) + 1;
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if (asset->extension_mask & DCA_EXSS_X96)
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// Size of X96 extension in extension substream
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asset->x96_size = get_bits(&s->gb, 12) + 1;
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if (asset->extension_mask & DCA_EXSS_LBR)
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parse_lbr_parameters(s, asset);
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if (asset->extension_mask & DCA_EXSS_XLL)
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parse_xll_parameters(s, asset);
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if (asset->extension_mask & DCA_EXSS_RSV1)
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skip_bits(&s->gb, 16);
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if (asset->extension_mask & DCA_EXSS_RSV2)
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skip_bits(&s->gb, 16);
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break;
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case 1: // Loss-less coding mode without CBR component
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asset->extension_mask = DCA_EXSS_XLL;
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parse_xll_parameters(s, asset);
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break;
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case 2: // Low bit rate mode
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asset->extension_mask = DCA_EXSS_LBR;
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parse_lbr_parameters(s, asset);
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break;
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case 3: // Auxiliary coding mode
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asset->extension_mask = 0;
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// Size of auxiliary coded data
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skip_bits(&s->gb, 14);
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// Auxiliary codec identification
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skip_bits(&s->gb, 8);
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// Aux sync word present flag
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if (get_bits1(&s->gb))
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// Aux sync distance
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skip_bits(&s->gb, 3);
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break;
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}
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if (asset->extension_mask & DCA_EXSS_XLL)
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// DTS-HD stream ID
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asset->hd_stream_id = get_bits(&s->gb, 3);
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// One to one mixing flag
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// Per channel main audio scaling flag
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// Main audio scaling codes
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// Decode asset in secondary decoder flag
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// Revision 2 DRC metadata
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// Reserved
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// Zero pad
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if (ff_dca_seek_bits(&s->gb, descr_pos + descr_size * 8)) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "Read past end of EXSS asset descriptor\n");
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int set_exss_offsets(DCAExssAsset *asset)
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{
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int offs = asset->asset_offset;
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int size = asset->asset_size;
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if (asset->extension_mask & DCA_EXSS_CORE) {
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asset->core_offset = offs;
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if (asset->core_size > size)
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return AVERROR_INVALIDDATA;
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offs += asset->core_size;
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size -= asset->core_size;
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}
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if (asset->extension_mask & DCA_EXSS_XBR) {
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asset->xbr_offset = offs;
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if (asset->xbr_size > size)
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return AVERROR_INVALIDDATA;
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offs += asset->xbr_size;
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size -= asset->xbr_size;
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}
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if (asset->extension_mask & DCA_EXSS_XXCH) {
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asset->xxch_offset = offs;
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if (asset->xxch_size > size)
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return AVERROR_INVALIDDATA;
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offs += asset->xxch_size;
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size -= asset->xxch_size;
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}
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if (asset->extension_mask & DCA_EXSS_X96) {
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asset->x96_offset = offs;
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if (asset->x96_size > size)
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return AVERROR_INVALIDDATA;
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offs += asset->x96_size;
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size -= asset->x96_size;
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}
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if (asset->extension_mask & DCA_EXSS_LBR) {
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asset->lbr_offset = offs;
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if (asset->lbr_size > size)
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return AVERROR_INVALIDDATA;
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offs += asset->lbr_size;
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size -= asset->lbr_size;
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}
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if (asset->extension_mask & DCA_EXSS_XLL) {
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asset->xll_offset = offs;
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if (asset->xll_size > size)
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return AVERROR_INVALIDDATA;
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offs += asset->xll_size;
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size -= asset->xll_size;
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}
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return 0;
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}
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int ff_dca_exss_parse(DCAExssParser *s, const uint8_t *data, int size)
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{
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int i, ret, offset, wide_hdr, header_size;
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if ((ret = init_get_bits8(&s->gb, data, size)) < 0)
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return ret;
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// Extension substream sync word
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skip_bits_long(&s->gb, 32);
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// User defined bits
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skip_bits(&s->gb, 8);
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// Extension substream index
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s->exss_index = get_bits(&s->gb, 2);
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// Flag indicating short or long header size
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wide_hdr = get_bits1(&s->gb);
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// Extension substream header length
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header_size = get_bits(&s->gb, 8 + 4 * wide_hdr) + 1;
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// Check CRC
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if (s->avctx && ff_dca_check_crc(s->avctx, &s->gb, 32 + 8, header_size * 8)) {
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av_log(s->avctx, AV_LOG_ERROR, "Invalid EXSS header checksum\n");
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return AVERROR_INVALIDDATA;
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}
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s->exss_size_nbits = 16 + 4 * wide_hdr;
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// Number of bytes of extension substream
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s->exss_size = get_bits(&s->gb, s->exss_size_nbits) + 1;
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if (s->exss_size > size) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "Packet too short for EXSS frame\n");
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return AVERROR_INVALIDDATA;
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}
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// Per stream static fields presence flag
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if (s->static_fields_present = get_bits1(&s->gb)) {
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int active_exss_mask[8];
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// Reference clock code
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skip_bits(&s->gb, 2);
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// Extension substream frame duration
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skip_bits(&s->gb, 3);
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// Timecode presence flag
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if (get_bits1(&s->gb))
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// Timecode data
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skip_bits_long(&s->gb, 36);
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// Number of defined audio presentations
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s->npresents = get_bits(&s->gb, 3) + 1;
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if (s->npresents > 1) {
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if (s->avctx)
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avpriv_request_sample(s->avctx, "%d audio presentations", s->npresents);
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return AVERROR_PATCHWELCOME;
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}
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// Number of audio assets in extension substream
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s->nassets = get_bits(&s->gb, 3) + 1;
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if (s->nassets > 1) {
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if (s->avctx)
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avpriv_request_sample(s->avctx, "%d audio assets", s->nassets);
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return AVERROR_PATCHWELCOME;
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}
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// Active extension substream mask for audio presentation
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for (i = 0; i < s->npresents; i++)
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active_exss_mask[i] = get_bits(&s->gb, s->exss_index + 1);
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// Active audio asset mask
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for (i = 0; i < s->npresents; i++)
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skip_bits_long(&s->gb, av_popcount(active_exss_mask[i]) * 8);
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// Mixing metadata enable flag
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if (s->mix_metadata_enabled = get_bits1(&s->gb)) {
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int spkr_mask_nbits;
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// Mixing metadata adjustment level
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skip_bits(&s->gb, 2);
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// Number of bits for mixer output speaker activity mask
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spkr_mask_nbits = (get_bits(&s->gb, 2) + 1) << 2;
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// Number of mixing configurations
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s->nmixoutconfigs = get_bits(&s->gb, 2) + 1;
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// Speaker layout mask for mixer output channels
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for (i = 0; i < s->nmixoutconfigs; i++)
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s->nmixoutchs[i] = ff_dca_count_chs_for_mask(get_bits(&s->gb, spkr_mask_nbits));
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}
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} else {
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s->npresents = 1;
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s->nassets = 1;
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}
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// Size of encoded asset data in bytes
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offset = header_size;
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for (i = 0; i < s->nassets; i++) {
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s->assets[i].asset_offset = offset;
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s->assets[i].asset_size = get_bits(&s->gb, s->exss_size_nbits) + 1;
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offset += s->assets[i].asset_size;
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if (offset > s->exss_size) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "EXSS asset out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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}
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// Audio asset descriptor
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for (i = 0; i < s->nassets; i++) {
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if ((ret = parse_descriptor(s, &s->assets[i])) < 0)
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return ret;
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if ((ret = set_exss_offsets(&s->assets[i])) < 0) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "Invalid extension size in EXSS asset descriptor\n");
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return ret;
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}
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}
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// Backward compatible core present
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// Backward compatible core substream index
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// Backward compatible core asset index
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// Reserved
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// Byte align
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// CRC16 of extension substream header
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if (ff_dca_seek_bits(&s->gb, header_size * 8)) {
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if (s->avctx)
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av_log(s->avctx, AV_LOG_ERROR, "Read past end of EXSS header\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
return 0;
|
|
}
|