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avformat/aviobuf: check if requested seekback buffer is already read

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Existing code did not check if the requested seekback buffer is
already read entirely. In this case, nothing has to be done to guarantee
seekback.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2020-09-26 19:20:50 +02:00
parent 74c70efd12
commit 6d972beb23
1 changed files with 3 additions and 0 deletions
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3
libavformat/aviobuf.c
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@ -999,6 +999,9 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
int filled = s->buf_end - s->buffer;
ptrdiff_t checksum_ptr_offset = s->checksum_ptr ? s->checksum_ptr - s->buffer : -1;
if (buf_size <= s->buf_end - s->buf_ptr)
return 0;
buf_size += s->buf_ptr - s->buffer + max_buffer_size;
if (buf_size < filled || s->seekable || !s->read_packet)