From a11cc04786c298a8e4df3da12d8e275eaaf6b333 Mon Sep 17 00:00:00 2001 From: Marton Balint Date: Sun, 20 Sep 2020 00:02:19 +0200 Subject: [PATCH] avformat/aviobuf: increase default read buffer size to 2*max_buffer_size for streamed data 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 --- libavformat/aviobuf.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c index c4195e310b4..15d91f91bc7 100644 --- a/libavformat/aviobuf.c +++ b/libavformat/aviobuf.c @@ -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); -- 2.39.5