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Simplify mpeg_decode_user_data()

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Originally committed as revision 20640 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-11-28 14:17:28 +00:00
parent 8d872e8ac9
commit 191ad11e91
1 changed files with 5 additions and 12 deletions
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17
libavcodec/mpeg12.c
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@ -2113,28 +2113,21 @@ static int vcr2_init_sequence(AVCodecContext *avctx)
static void mpeg_decode_user_data(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
const uint8_t *p, int buf_size)
{
const uint8_t *p;
int len, flags;
p = buf;
len = buf_size;
const uint8_t *buf_end = p+buf_size;
/* we parse the DTG active format information */
if (len >= 5 &&
if (buf_end - p >= 5 &&
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
flags = p[4];
int flags = p[4];
p += 5;
len -= 5;
if (flags & 0x80) {
/* skip event id */
if (len < 2)
return;
p += 2;
len -= 2;
}
if (flags & 0x40) {
if (len < 1)
if (buf_end - p < 1)
return;
avctx->dtg_active_format = p[0] & 0x0f;
}