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libavcodec/jpeg2000_parser: Speed up long skips

This commit is contained in:
Tomas Härdin 2022-05-20 11:38:25 +02:00
parent 7f3f3539e8
commit 1ee994e168
1 changed files with 11 additions and 0 deletions
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11
libavcodec/jpeg2000_parser.c
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@ -95,6 +95,17 @@ static int find_frame_end(JPEG2000ParserContext *m, const uint8_t *buf, int buf_
state64 = state64 << 8 | buf[i];
m->bytes_read++;
if (m->skip_bytes) {
// handle long skips
if (m->skip_bytes > 8) {
// need -9 else buf_size - i == 8 ==> i == buf_size after this,
// and thus i == buf_size + 1 after the loop
int skip = FFMIN(FFMIN((int64_t)m->skip_bytes - 8, buf_size - i - 9), INT_MAX);
if (skip > 0) {
m->skip_bytes -= skip;
i += skip;
m->bytes_read += skip;
}
}
m->skip_bytes--;
continue;
}