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matroskadec: Support webm doctype

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Patch by James Zern <jzern at google>

Originally committed as revision 23245 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
James Zern 2010-05-22 01:41:32 +00:00 committed by David Conrad
parent 6a2c9b8bcb
commit 470491faed
4 changed files with 24 additions and 9 deletions
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1
Changelog
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@ -71,6 +71,7 @@ version <next>:
- spectral extension support in the E-AC-3 decoder
- unsharp video filter
- RTP hinting in the mov/3gp/mp4 muxer
- WebM support in Matroska demuxer

1
doc/general.texi
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@ -234,6 +234,7 @@ library:
@item VC-1 test bitstream @tab X @tab X
@item WAV @tab X @tab X
@item WavPack @tab @tab X
@item WebM @tab @tab X
@item Wing Commander III movie @tab @tab X
@tab Multimedia format used in Origin's Wing Commander III computer game.
@item Westwood Studios audio @tab @tab X

2
libavformat/avformat.h
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@ -22,7 +22,7 @@
#define AVFORMAT_AVFORMAT_H
#define LIBAVFORMAT_VERSION_MAJOR 52
#define LIBAVFORMAT_VERSION_MINOR 63
#define LIBAVFORMAT_VERSION_MINOR 64
#define LIBAVFORMAT_VERSION_MICRO 0
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

29
libavformat/matroskadec.c
View File

@ -505,6 +505,8 @@ static EbmlSyntax matroska_clusters[] = {
{ 0 }
};
static const char *matroska_doctypes[] = { "matroska", "webm" };
/*
* Return: Whether we reached the end of a level in the hierarchy or not.
*/
@ -825,8 +827,7 @@ static void ebml_free(EbmlSyntax *syntax, void *data)
static int matroska_probe(AVProbeData *p)
{
uint64_t total = 0;
int len_mask = 0x80, size = 1, n = 1;
static const char probe_data[] = "matroska";
int len_mask = 0x80, size = 1, n = 1, i;
/* EBML header? */
if (AV_RB32(p->buf) != EBML_ID_HEADER)
@ -848,13 +849,16 @@ static int matroska_probe(AVProbeData *p)
if (p->buf_size < 4 + size + total)
return 0;
/* The header must contain the document type 'matroska'. For now,
/* The header should contain a known document type. For now,
* we don't parse the whole header but simply check for the
* availability of that array of characters inside the header.
* Not fully fool-proof, but good enough. */
for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
return AVPROBE_SCORE_MAX;
for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
int probelen = strlen(matroska_doctypes[i]);
for (n = 4+size; n <= 4+size+total-probelen; n++)
if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
return AVPROBE_SCORE_MAX;
}
return 0;
}
@ -1141,14 +1145,23 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
/* First read the EBML header. */
if (ebml_parse(matroska, ebml_syntax, &ebml)
|| ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
|| ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
|| ebml.doctype_version > 2) {
|| ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
av_log(matroska->ctx, AV_LOG_ERROR,
"EBML header using unsupported features\n"
"(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
ebml.version, ebml.doctype, ebml.doctype_version);
ebml_free(ebml_syntax, &ebml);
return AVERROR_PATCHWELCOME;
}
for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
if (!strcmp(ebml.doctype, matroska_doctypes[i]))
break;
if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
av_log(s, AV_LOG_ERROR, "Unknown EBML doctype '%s'\n", ebml.doctype);
ebml_free(ebml_syntax, &ebml);
return AVERROR_PATCHWELCOME;
}
av_metadata_set2(&s->metadata, "doctype", ebml.doctype, 0);
ebml_free(ebml_syntax, &ebml);
/* The next thing is a segment. */