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Support decoding of FLAC files without a STREAMINFO header. 

Originally committed as revision 25315 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-10-02 20:37:43 +00:00
parent f71abdbbd7
commit 2e0559b713
1 changed files with 28 additions and 4 deletions
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32
libavcodec/flacdec.c
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@ -581,18 +581,27 @@ static int decode_frame(FLACContext *s)
return -1;
}
if (fi.channels != s->channels) {
if (s->channels && fi.channels != s->channels) {
av_log(s->avctx, AV_LOG_ERROR, "switching channel layout mid-stream "
"is not supported\n");
return -1;
}
s->channels = s->avctx->channels = fi.channels;
s->ch_mode = fi.ch_mode;
if (fi.bps && fi.bps != s->bps) {
if (!s->bps && !fi.bps) {
av_log(s->avctx, AV_LOG_ERROR, "bps not found in STREAMINFO or frame header\n");
return -1;
}
if (!fi.bps) {
fi.bps = s->bps;
} else if (s->bps && fi.bps != s->bps) {
av_log(s->avctx, AV_LOG_ERROR, "switching bps mid-stream is not "
"supported\n");
return -1;
}
s->bps = s->avctx->bits_per_raw_sample = fi.bps;
if (s->bps > 16) {
s->avctx->sample_fmt = SAMPLE_FMT_S32;
s->sample_shift = 32 - s->bps;
@ -603,6 +612,8 @@ static int decode_frame(FLACContext *s)
s->is32 = 0;
}
if (!s->max_blocksize)
s->max_blocksize = FLAC_MAX_BLOCKSIZE;
if (fi.blocksize > s->max_blocksize) {
av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", fi.blocksize,
s->max_blocksize);
@ -610,14 +621,25 @@ static int decode_frame(FLACContext *s)
}
s->blocksize = fi.blocksize;
if (!s->samplerate && !fi.samplerate) {
av_log(s->avctx, AV_LOG_ERROR, "sample rate not found in STREAMINFO"
" or frame header\n");
return -1;
}
if (fi.samplerate == 0) {
fi.samplerate = s->samplerate;
} else if (fi.samplerate != s->samplerate) {
} else if (s->samplerate && fi.samplerate != s->samplerate) {
av_log(s->avctx, AV_LOG_WARNING, "sample rate changed from %d to %d\n",
s->samplerate, fi.samplerate);
}
s->samplerate = s->avctx->sample_rate = fi.samplerate;
if (!s->got_streaminfo) {
allocate_buffers(s);
s->got_streaminfo = 1;
dump_headers(s->avctx, (FLACStreaminfo *)s);
}
// dump_headers(s->avctx, (FLACStreaminfo *)s);
/* subframes */
@ -650,7 +672,9 @@ static int flac_decode_frame(AVCodecContext *avctx,
*data_size=0;
if (s->max_framesize == 0) {
s->max_framesize= FFMAX(4, buf_size); // should hopefully be enough for the first header
s->max_framesize =
ff_flac_get_max_frame_size(s->max_blocksize ? s->max_blocksize : FLAC_MAX_BLOCKSIZE,
FLAC_MAX_CHANNELS, 32);
s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
}