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avformat/mp3dec: properly allocate dummy AVCodecContext

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Fixes (harmless) use of uninitialized variable

Found-by: jamrial
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 6ad42b3e15)

Conflicts:

	libavformat/mp3dec.c
This commit is contained in:
Michael Niedermayer 2015-02-26 19:59:44 +01:00
parent d61022d55f
commit a7dedd8ea5
1 changed files with 3 additions and 2 deletions
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5
libavformat/mp3dec.c
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@ -61,7 +61,7 @@ static int mp3_read_probe(AVProbeData *p)
int fsize, frames, sample_rate;
uint32_t header;
const uint8_t *buf, *buf0, *buf2, *end;
AVCodecContext avctx;
AVCodecContext *avctx = avcodec_alloc_context3(NULL);
buf0 = p->buf;
end = p->buf + p->buf_size - sizeof(uint32_t);
@ -78,7 +78,7 @@ static int mp3_read_probe(AVProbeData *p)
for(frames = 0; buf2 < end; frames++) {
header = AV_RB32(buf2);
fsize = avpriv_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
fsize = avpriv_mpa_decode_header(avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
if(fsize < 0)
break;
buf2 += fsize;
@ -87,6 +87,7 @@ static int mp3_read_probe(AVProbeData *p)
if(buf == buf0)
first_frames= frames;
}
avcodec_free_context(&avctx);
// keep this in sync with ac3 probe, both need to avoid
// issues with MPEG-files!
if (first_frames>=4) return AVPROBE_SCORE_EXTENSION + 1;