Add av_append_packet function, to be used in code that merges packets

to allow palette handling without using PaletteControl.

Originally committed as revision 25777 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 15 insertions, 0 deletions

diff --git a/libavformat/utils.c b/libavformat/utils.c
index 937a615fc0..066da547f3 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -339,6 +339,21 @@ int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size)
     return ret;
 }
 
+int av_append_packet(ByteIOContext *s, AVPacket *pkt, int size)
+{
+    int ret;
+    int old_size;
+    if (!pkt->size)
+        return av_get_packet(s, pkt, size);
+    old_size = pkt->size;
+    ret = av_grow_packet(pkt, size);
+    if (ret < 0)
+        return ret;
+    ret = get_buffer(s, pkt->data + old_size, size);
+    av_shrink_packet(pkt, old_size + FFMAX(ret, 0));
+    return ret;
+}
+
 
 int av_filename_number_test(const char *filename)
 {