[FFmpeg-devel] [PATCH] avformat/aviobuf: realloc memory in ffio_ensure_seekback()

[Paul B Mahol]

This removes big CPU overhead for demuxing chained ogg streams.

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavformat/aviobuf.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index a77517d712..6d01150f66 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -1005,12 +1005,11 @@ int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
         return 0;
     av_assert0(!s->write_flag);
 
-    buffer = av_malloc(buf_size);
+    buffer = s->buffer;
+    buffer = av_realloc(buffer, buf_size);
     if (!buffer)
         return AVERROR(ENOMEM);
 
-    memcpy(buffer, s->buffer, filled);
-    av_free(s->buffer);
     s->buf_ptr = buffer + (s->buf_ptr - s->buffer);
     s->buf_end = buffer + (s->buf_end - s->buffer);
     s->buffer = buffer;
-- 
2.17.1