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avformat/aviobuf: do not allocate a new buffer in ffio_ensure_seekback if not needed 

Let's move unread data to the start of the old buffer instead.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2020-09-29 00:15:27 +02:00
parent da74a74061
commit 84d8815499
1 changed files with 5 additions and 1 deletions
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6
libavformat/aviobuf.c
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@ -1015,7 +1015,10 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
return 0;
av_assert0(!s->write_flag);
buf_size = FFMAX(buf_size, s->buffer_size);
if (buf_size <= s->buffer_size) {
update_checksum(s);
memmove(s->buffer, s->buf_ptr, filled);
} else {
buffer = av_malloc(buf_size);
if (!buffer)
return AVERROR(ENOMEM);
@ -1024,6 +1027,7 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
av_free(s->buffer);
s->buffer = buffer;
s->buffer_size = buf_size;
}
s->buf_ptr = s->buffer;
s->buf_end = s->buffer + filled;
s->checksum_ptr = s->buffer;