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ffmpeg.wasm-core
Commit 33fc6c17 authored by foo86's avatar foo86 Committed by James Almer
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avcodec/dca_core: switch to common frame header parsing function 

Signed-off-by: 's avatarJames Almer <jamrial@gmail.com>
parent 2123ddb4
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Showing with 51 additions and 98 deletions
libavcodec/dca_core.c
View file @ 33fc6c17
......@@ -81,114 +81,68 @@ static void get_array(GetBitContext *s, int32_t *array, int size, int n)
// 5.3.1 - Bit stream header
static int parse_frame_header(DCACoreDecoder *s)
{
int normal_frame, pcmr_index;
DCACoreFrameHeader h = { 0 };
int err = avpriv_dca_parse_core_frame_header(&s->gb, &h);
// Frame type
normal_frame = get_bits1(&s->gb);
// Deficit sample count
if (get_bits(&s->gb, 5) != DCA_PCMBLOCK_SAMPLES - 1) {
if (err < 0) {
switch (err) {
case DCA_PARSE_ERROR_DEFICIT_SAMPLES:
av_log(s->avctx, AV_LOG_ERROR, "Deficit samples are not supported\n");
return normal_frame ? AVERROR_INVALIDDATA : AVERROR_PATCHWELCOME;
}
return h.normal_frame ? AVERROR_INVALIDDATA : AVERROR_PATCHWELCOME;
// CRC present flag
s->crc_present = get_bits1(&s->gb);
// Number of PCM sample blocks
s->npcmblocks = get_bits(&s->gb, 7) + 1;
if (s->npcmblocks & (DCA_SUBBAND_SAMPLES - 1)) {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of PCM sample blocks (%d)\n", s->npcmblocks);
return (s->npcmblocks < 6 || normal_frame) ? AVERROR_INVALIDDATA : AVERROR_PATCHWELCOME;
}
case DCA_PARSE_ERROR_PCM_BLOCKS:
av_log(s->avctx, AV_LOG_ERROR, "Unsupported number of PCM sample blocks (%d)\n", h.npcmblocks);
return (h.npcmblocks < 6 || h.normal_frame) ? AVERROR_INVALIDDATA : AVERROR_PATCHWELCOME;
// Primary frame byte size
s->frame_size = get_bits(&s->gb, 14) + 1;
if (s->frame_size < 96) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid core frame size (%d bytes)\n", s->frame_size);
case DCA_PARSE_ERROR_FRAME_SIZE:
av_log(s->avctx, AV_LOG_ERROR, "Invalid core frame size (%d bytes)\n", h.frame_size);
return AVERROR_INVALIDDATA;
}
// Audio channel arrangement
s->audio_mode = get_bits(&s->gb, 6);
if (s->audio_mode >= DCA_AMODE_COUNT) {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported audio channel arrangement (%d)\n", s->audio_mode);
case DCA_PARSE_ERROR_AMODE:
av_log(s->avctx, AV_LOG_ERROR, "Unsupported audio channel arrangement (%d)\n", h.audio_mode);
return AVERROR_PATCHWELCOME;
}
// Core audio sampling frequency
s->sample_rate = avpriv_dca_sample_rates[get_bits(&s->gb, 4)];
if (!s->sample_rate) {
case DCA_PARSE_ERROR_SAMPLE_RATE:
av_log(s->avctx, AV_LOG_ERROR, "Invalid core audio sampling frequency\n");
return AVERROR_INVALIDDATA;
}
// Transmission bit rate
s->bit_rate = ff_dca_bit_rates[get_bits(&s->gb, 5)];
// Reserved field
skip_bits1(&s->gb);
// Embedded dynamic range flag
s->drc_present = get_bits1(&s->gb);
// Embedded time stamp flag
s->ts_present = get_bits1(&s->gb);
// Auxiliary data flag
s->aux_present = get_bits1(&s->gb);
// HDCD mastering flag
skip_bits1(&s->gb);
// Extension audio descriptor flag
s->ext_audio_type = get_bits(&s->gb, 3);
// Extended coding flag
s->ext_audio_present = get_bits1(&s->gb);
// Audio sync word insertion flag
s->sync_ssf = get_bits1(&s->gb);
case DCA_PARSE_ERROR_RESERVED_BIT:
av_log(s->avctx, AV_LOG_ERROR, "Reserved bit set\n");
return AVERROR_INVALIDDATA;
// Low frequency effects flag
s->lfe_present = get_bits(&s->gb, 2);
if (s->lfe_present == DCA_LFE_FLAG_INVALID) {
case DCA_PARSE_ERROR_LFE_FLAG:
av_log(s->avctx, AV_LOG_ERROR, "Invalid low frequency effects flag\n");
return AVERROR_INVALIDDATA;
}
// Predictor history flag switch
s->predictor_history = get_bits1(&s->gb);
// Header CRC check bytes
if (s->crc_present)
skip_bits(&s->gb, 16);
// Multirate interpolator switch
s->filter_perfect = get_bits1(&s->gb);
// Encoder software revision
skip_bits(&s->gb, 4);
// Copy history
skip_bits(&s->gb, 2);
// Source PCM resolution
s->source_pcm_res = ff_dca_bits_per_sample[pcmr_index = get_bits(&s->gb, 3)];
if (!s->source_pcm_res) {
case DCA_PARSE_ERROR_PCM_RES:
av_log(s->avctx, AV_LOG_ERROR, "Invalid source PCM resolution\n");
return AVERROR_INVALIDDATA;
}
s->es_format = pcmr_index & 1;
// Front sum/difference flag
s->sumdiff_front = get_bits1(&s->gb);
// Surround sum/difference flag
s->sumdiff_surround = get_bits1(&s->gb);
default:
av_log(s->avctx, AV_LOG_ERROR, "Unknown core frame header error\n");
return AVERROR_INVALIDDATA;
}
}
// Dialog normalization / unspecified
skip_bits(&s->gb, 4);
s->crc_present = h.crc_present;
s->npcmblocks = h.npcmblocks;
s->frame_size = h.frame_size;
s->audio_mode = h.audio_mode;
s->sample_rate = avpriv_dca_sample_rates[h.sr_code];
s->bit_rate = ff_dca_bit_rates[h.br_code];
s->drc_present = h.drc_present;
s->ts_present = h.ts_present;
s->aux_present = h.aux_present;
s->ext_audio_type = h.ext_audio_type;
s->ext_audio_present = h.ext_audio_present;
s->sync_ssf = h.sync_ssf;
s->lfe_present = h.lfe_present;
s->predictor_history = h.predictor_history;
s->filter_perfect = h.filter_perfect;
s->source_pcm_res = ff_dca_bits_per_sample[h.pcmr_code];
s->es_format = h.pcmr_code & 1;
s->sumdiff_front = h.sumdiff_front;
s->sumdiff_surround = h.sumdiff_surround;
return 0;
}
......@@ -1850,7 +1804,6 @@ int ff_dca_core_parse(DCACoreDecoder *s, uint8_t *data, int size)
if ((ret = init_get_bits8(&s->gb, data, size)) < 0)
return ret;
skip_bits_long(&s->gb, 32);
if ((ret = parse_frame_header(s)) < 0)
return ret;
if ((ret = alloc_sample_buffer(s)) < 0)
......
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