Never shrink the ByteIOContext buffer in ff_rewind_with_probe_data

If there is little unread data in the ByteIOContext buffer, this may lead
to reducing the size of the ByteIOContext buffer to little more the probe
data size. This can lead to suboptimal aviobuf behaviour, e.g. making some
demuxers fail to do short seeks backwards (if the input isn't seekable).

Originally committed as revision 24478 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/aviobuf.c

@@ -667,7 +667,7 @@ int ff_rewind_with_probe_data(ByteIOContext *s, unsigned char *buf, int buf_size
 {
     int64_t buffer_start;
     int buffer_size;
-    int overlap, new_size;
+    int overlap, new_size, alloc_size;
 
     if (s->write_flag)
         return AVERROR(EINVAL);
@@ -681,17 +681,20 @@ int ff_rewind_with_probe_data(ByteIOContext *s, unsigned char *buf, int buf_size
     overlap = buf_size - buffer_start;
     new_size = buf_size + buffer_size - overlap;
 
-    if (new_size > buf_size) {
-        if (!(buf = av_realloc(buf, new_size)))
+    alloc_size = FFMAX(s->buffer_size, new_size);
+    if (alloc_size > buf_size)
+        if (!(buf = av_realloc(buf, alloc_size)))
             return AVERROR(ENOMEM);
 
+    if (new_size > buf_size) {
         memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
         buf_size = new_size;
     }
 
     av_free(s->buffer);
     s->buf_ptr = s->buffer = buf;
-    s->pos = s->buffer_size = buf_size;
+    s->buffer_size = alloc_size;
+    s->pos = buf_size;
     s->buf_end = s->buf_ptr + buf_size;
     s->eof_reached = 0;
     s->must_flush = 0;