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Add experimental demuxing support for FLAC in ISO BMFF (MP4).

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Based on the draft spec at https://git.xiph.org/?p=flac.git;a=blob;f=doc/isoflac.txt

Signed-off-by: Matthew Gregan <kinetik@flim.org>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Matthew Gregan 2016-10-21 16:10:43 +13:00 committed by James Almer
parent 7dc4200c38
commit 2d73d25670
1 changed files with 39 additions and 0 deletions
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39
libavformat/mov.c
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@ -44,6 +44,7 @@
#include "libavutil/sha.h"
#include "libavutil/timecode.h"
#include "libavcodec/ac3tab.h"
#include "libavcodec/flac.h"
#include "libavcodec/mpegaudiodecheader.h"
#include "avformat.h"
#include "internal.h"
@ -4742,6 +4743,43 @@ static int mov_read_saiz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
return 0;
}
static int mov_read_dfla(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
AVStream *st;
int last, type, size, ret;
uint8_t buf[4];
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((uint64_t)atom.size > (1<<30) || atom.size < 42)
return AVERROR_INVALIDDATA;
/* Check FlacSpecificBox version. */
if (avio_r8(pb) != 0)
return AVERROR_INVALIDDATA;
avio_rb24(pb); /* Flags */
avio_read(pb, buf, sizeof(buf));
flac_parse_block_header(buf, &last, &type, &size);
if (type != FLAC_METADATA_TYPE_STREAMINFO || size != FLAC_STREAMINFO_SIZE) {
av_log(c->fc, AV_LOG_ERROR, "STREAMINFO must be first FLACMetadataBlock\n");
return AVERROR_INVALIDDATA;
}
ret = ff_get_extradata(c->fc, st->codecpar, pb, size);
if (ret < 0)
return ret;
if (!last)
av_log(c->fc, AV_LOG_WARNING, "non-STREAMINFO FLACMetadataBlock(s) ignored\n");
return 0;
}
static int cenc_filter(MOVContext *c, MOVStreamContext *sc, uint8_t *input, int size)
{
uint32_t encrypted_bytes;
@ -4916,6 +4954,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
{ MKTAG('f','r','m','a'), mov_read_frma },
{ MKTAG('s','e','n','c'), mov_read_senc },
{ MKTAG('s','a','i','z'), mov_read_saiz },
{ MKTAG('d','f','L','a'), mov_read_dfla },
{ 0, NULL }
};