From 9c12d54afa70f3535a7114498433cf566a9e9a86 Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Tue, 31 Jan 2017 14:48:10 +0100
Subject: demux_mkv: passthrough BlockAdditions for libvpx alpha

Dumb but simple thing. Requires the FFmpeg libvpx decoder wrapper, as
its native decoder doesn't support alpha.
---
 demux/packet.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'demux/packet.c')

diff --git a/demux/packet.c b/demux/packet.c
index b33d5b618e..4ee9253ebf 100644
--- a/demux/packet.c
+++ b/demux/packet.c
@@ -133,7 +133,7 @@ struct demux_packet *demux_copy_packet(struct demux_packet *dp)
 int demux_packet_set_padding(struct demux_packet *dp, int start, int end)
 {
 #if LIBAVCODEC_VERSION_MICRO >= 100
-    if (!start  && !end)
+    if (!start && !end)
         return 0;
     if (!dp->avpacket)
         return -1;
@@ -146,3 +146,21 @@ int demux_packet_set_padding(struct demux_packet *dp, int start, int end)
 #endif
     return 0;
 }
+
+int demux_packet_add_blockadditional(struct demux_packet *dp, uint64_t id,
+                                     void *data, size_t size)
+{
+#if LIBAVCODEC_VERSION_MICRO >= 100
+    if (!dp->avpacket)
+        return -1;
+    uint8_t *sd =  av_packet_new_side_data(dp->avpacket,
+                                           AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
+                                           8 + size);
+    if (!sd)
+        return -1;
+    AV_WB64(sd, id);
+    if (size > 0)
+        memcpy(sd + 8, data, size);
+#endif
+    return 0;
+}
-- 
cgit v1.2.3