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asfdec: Add an option for not searching for the packet markers 

Some streams don't contain these.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-04-06 16:54:23 +03:00
parent 1428527581
commit 75b7feaeb4
1 changed files with 20 additions and 1 deletions
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21
libavformat/asfdec.c
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@ -26,6 +26,7 @@
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
@ -35,6 +36,7 @@
#include "avlanguage.h"
typedef struct {
const AVClass *class;
int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID
ASFStream streams[128]; ///< it's max number and it's not that big
uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming)
@ -72,8 +74,22 @@ typedef struct {
int stream_index;
ASFStream* asf_st; ///< currently decoded stream
int no_resync_search;
} ASFContext;
static const AVOption options[] = {
{"no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass asf_class = {
.class_name = "asf demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
#undef NDEBUG
#include <assert.h>
@ -709,7 +725,9 @@ static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
// if we do not know packet size, allow skipping up to 32 kB
off= 32768;
if (s->packet_size > 0)
if (asf->no_resync_search)
off = 3;
else if (s->packet_size > 0)
off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
c=d=e=-1;
@ -1293,4 +1311,5 @@ AVInputFormat ff_asf_demuxer = {
.read_seek = asf_read_seek,
.read_timestamp = asf_read_pts,
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
.priv_class = &asf_class,
};