Fix compilation with FFmpeg 0.9.2 and 1.0.7

Originally committed to SVN as r755.

include/ffmscompat.h

@@ -72,7 +72,7 @@
 #       undef CodecID
 #   endif
 #   if VERSION_CHECK(LIBAVCODEC_VERSION_INT, <, 54, 28, 0, 54, 59, 100)
-#       define avcodec_free_frame av_free
+static void avcodec_free_frame(AVFrame **frame) { av_freep(frame); }
 #   endif
 #endif
 

src/core/audiosource.h

@@ -29,6 +29,9 @@ extern "C" {
 #include <vector>
 #include <list>
 #include <memory>
+
+#include "ffmscompat.h"
+
 #include "indexing.h"
 #include "utils.h"
 #include "ffms.h"

src/core/utils.cpp

@@ -22,6 +22,11 @@
 #include <errno.h>
 #include <algorithm>
 
+// avcodec.h includes audioconvert.h, but we need to include audioconvert.h
+// ourselves later
+#define FF_API_OLD_AUDIOCONVERT 0
+#define AVUTIL_AUDIOCONVERT_H
+
 #include "utils.h"
 
 #include "codectype.h"
@@ -217,9 +222,18 @@ void InitNullPacket(AVPacket &pkt) {
 extern "C" {
 #if VERSION_CHECK(LIBAVUTIL_VERSION_INT, >=, 52, 2, 0, 52, 6, 100)
 #include <libavutil/channel_layout.h>
-#elif VERSION_CHECK(LIBAVUTIL_VERSION_INT, >=, 51, 26, 0, 51, 45, 100)
-#include <libavutil/audioconvert.h>
 #else
+#undef AVUTIL_AUDIOCONVERT_H
+
+// Whether or not av_get_default_channel_layout exists in a given version
+// depends on which branch that version is from, since FFmpeg doesn't
+// understand the concept of version numbers. Work around this by always using
+// our copy, since that's less effort than detecting whether or not it's
+// available.
+#define av_get_default_channel_layout av_get_default_channel_layout_hurr
+#include "libavutil/audioconvert.h"
+#undef av_get_default_channel_layout
+
 static int64_t av_get_default_channel_layout(int nb_channels) {
 	switch(nb_channels) {
 		case 1: return AV_CH_LAYOUT_MONO;