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fix mjpega bitfilter when dht, dqt, sof0 are not ordered as expected, patch by Jay Freeman, saurik at saurik com 

Originally committed as revision 16074 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jay Freeman 2008-12-12 01:40:00 +00:00 committed by Baptiste Coudurier
parent d887151d8c
commit 65c127e3d5
1 changed files with 7 additions and 5 deletions
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12
libavcodec/mjpega_dump_header_bsf.c
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@ -35,6 +35,7 @@ static int mjpega_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *av
const uint8_t *buf, int buf_size, int keyframe)
{
uint8_t *poutbufp;
unsigned dqt = 0, dht = 0, sof0 = 0;
int i;
if (avctx->codec_id != CODEC_ID_MJPEG) {
@ -59,12 +60,13 @@ static int mjpega_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *av
for (i = 0; i < buf_size - 1; i++) {
if (buf[i] == 0xff) {
switch (buf[i + 1]) {
case DQT: /* quant off */
case DHT: /* huff off */
case SOF0: /* image off */
bytestream_put_be32(&poutbufp, i + 46);
break;
case DQT: dqt = i + 46; break;
case DHT: dht = i + 46; break;
case SOF0: sof0 = i + 46; break;
case SOS:
bytestream_put_be32(&poutbufp, dqt); /* quant off */
bytestream_put_be32(&poutbufp, dht); /* huff off */
bytestream_put_be32(&poutbufp, sof0); /* image off */
bytestream_put_be32(&poutbufp, i + 46); /* scan off */
bytestream_put_be32(&poutbufp, i + 46 + AV_RB16(buf + i + 2)); /* data off */
bytestream_put_buffer(&poutbufp, buf + 2, buf_size - 2); /* skip already written SOI */