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lavf/mlv: Only add streams that are supposed to contain frames. 

Fixes ticket #4296.

Reviewed-by: Peter Ross
This commit is contained in:
Carl Eugen Hoyos 2015-02-07 16:18:02 +01:00
parent ec8ec999f4
commit ac923ed470
1 changed files with 10 additions and 13 deletions
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23
libavformat/mlvdec.c
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@ -242,6 +242,7 @@ static int read_header(AVFormatContext *avctx)
AVIOContext *pb = avctx->pb;
AVStream *vst = NULL, *ast = NULL;
int size, ret;
unsigned nb_video_frames, nb_audio_frames;
uint64_t guid;
char guidstr[32];
@ -259,11 +260,17 @@ static int read_header(AVFormatContext *avctx)
avio_skip(pb, 8); //fileNum, fileCount, fileFlags
mlv->class[0] = avio_rl16(pb);
if (mlv->class[0]) {
mlv->class[1] = avio_rl16(pb);
nb_video_frames = avio_rl32(pb);
nb_audio_frames = avio_rl32(pb);
if (nb_video_frames && mlv->class[0]) {
vst = avformat_new_stream(avctx, NULL);
if (!vst)
return AVERROR(ENOMEM);
vst->id = 0;
vst->nb_frames = nb_video_frames;
if ((mlv->class[0] & (MLV_CLASS_FLAG_DELTA|MLV_CLASS_FLAG_LZMA)))
avpriv_request_sample(avctx, "compression");
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
@ -289,12 +296,12 @@ static int read_header(AVFormatContext *avctx)
}
}
mlv->class[1] = avio_rl16(pb);
if (mlv->class[1]) {
if (nb_audio_frames && mlv->class[1]) {
ast = avformat_new_stream(avctx, NULL);
if (!ast)
return AVERROR(ENOMEM);
ast->id = 1;
ast->nb_frames = nb_audio_frames;
if ((mlv->class[1] & MLV_CLASS_FLAG_LZMA))
avpriv_request_sample(avctx, "compression");
if ((mlv->class[1] & ~MLV_CLASS_FLAG_LZMA) != MLV_AUDIO_CLASS_WAV)
@ -304,16 +311,6 @@ static int read_header(AVFormatContext *avctx)
avpriv_set_pts_info(ast, 33, 1, ast->codec->sample_rate);
}
if (vst)
vst->nb_frames = avio_rl32(pb);
else
avio_skip(pb, 4);
if (ast)
ast->nb_frames = avio_rl32(pb);
else
avio_skip(pb, 4);
if (vst) {
AVRational framerate;
framerate.num = avio_rl32(pb);