libmpeg2: Add patches from Handbrake project

libmpeg2 is abandoned upstream.

Patches:
- A00: Fix tag handling on frames

2 files changed, 33 insertions, 1 deletions

diff --git a/pkgs/development/libraries/libmpeg2/A00-tags.patch b/pkgs/development/libraries/libmpeg2/A00-tags.patch
new file mode 100644
index 00000000000..0b5d7d7da12
--- /dev/null
+++ b/pkgs/development/libraries/libmpeg2/A00-tags.patch
@@ -0,0 +1,27 @@
+diff -ru mpeg2dec.orig/libmpeg2/decode.c mpeg2dec/libmpeg2/decode.c
+--- mpeg2dec.orig/libmpeg2/decode.c	2008-07-09 12:16:05.000000000 -0700
++++ mpeg2dec/libmpeg2/decode.c	2009-07-03 16:29:48.000000000 -0700
+@@ -212,7 +212,7 @@
+ 
+ mpeg2_state_t mpeg2_parse_header (mpeg2dec_t * mpeg2dec)
+ {
+-    static int (* process_header[]) (mpeg2dec_t * mpeg2dec) = {
++    static int (* process_header[]) (mpeg2dec_t *) = {
+ 	mpeg2_header_picture, mpeg2_header_extension, mpeg2_header_user_data,
+ 	mpeg2_header_sequence, NULL, NULL, NULL, NULL, mpeg2_header_gop
+     };
+@@ -368,6 +368,14 @@
+ 
+ void mpeg2_tag_picture (mpeg2dec_t * mpeg2dec, uint32_t tag, uint32_t tag2)
+ {
++    if (mpeg2dec->num_tags == 0 && mpeg2dec->state == STATE_PICTURE && mpeg2dec->picture) {
++        // since tags got processed when we entered this state we
++        // have to set them directly or they'll end up on the next frame.
++        mpeg2dec->picture->tag = tag;
++        mpeg2dec->picture->tag2 = tag2;
++        mpeg2dec->picture->flags |= PIC_FLAG_TAGS;
++        return;
++    }
+     mpeg2dec->tag_previous = mpeg2dec->tag_current;
+     mpeg2dec->tag2_previous = mpeg2dec->tag2_current;
+     mpeg2dec->tag_current = tag;
diff --git a/pkgs/development/libraries/libmpeg2/default.nix b/pkgs/development/libraries/libmpeg2/default.nix
index 1d04eea89f6..e651a932efe 100644
--- a/pkgs/development/libraries/libmpeg2/default.nix
+++ b/pkgs/development/libraries/libmpeg2/default.nix
@@ -1,13 +1,18 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "libmpeg2-0.5.1";
+  name = "libmpeg2-0.5.1p4";
   
   src = fetchurl {
     url = "http://libmpeg2.sourceforge.net/files/${name}.tar.gz";
     sha256 = "1m3i322n2fwgrvbs1yck7g5md1dbg22bhq5xdqmjpz5m7j4jxqny";
   };
 
+  # From Handbrake - Project seems unmaintained
+  patches = [
+    ./A00-tags.patch
+  ];
+
   meta = {
     homepage = http://libmpeg2.sourceforge.net/;
     description = "A free library for decoding mpeg-2 and mpeg-1 video streams";