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avformat/aviobuf: increase default read buffer size to 2*max_buffer_size for streamed data

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This should increase the effectiveness of ffio_ensure_seekback by reducing the
number of buffer reallocations and memmoves/memcpys because even a small
seekback window requires max_buffer_size+window_size buffer space.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2020-09-20 00:02:19 +02:00
parent 25ced19aa3
commit a11cc04786
1 changed files with 5 additions and 0 deletions
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5
libavformat/aviobuf.c
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@ -938,6 +938,11 @@ int ffio_fdopen(AVIOContext **s, URLContext *h)
} else {
buffer_size = IO_BUFFER_SIZE;
}
if (!(h->flags & AVIO_FLAG_WRITE) && h->is_streamed) {
if (buffer_size > INT_MAX/2)
return AVERROR(EINVAL);
buffer_size *= 2;
}
buffer = av_malloc(buffer_size);
if (!buffer)
return AVERROR(ENOMEM);