[trancode/artwork] Put back compability with older versions of ffmpeg/libav

configure.ac

@@ -256,6 +256,9 @@ FORK_MODULES_CHECK([FORKED], [LIBAV],
 	 AC_CHECK_HEADERS([libavutil/channel_layout.h libavutil/mathematics.h])
 	])
 
+dnl TODO Actually test for this
+AM_CONDITIONAL([COND_FFMPEG_LEGACY], [[test "yes" = "no"]])
+
 AC_CHECK_SIZEOF([void *])
 
 dnl --- Begin configuring the options ---

src/Makefile.am

@@ -43,6 +43,12 @@ else
 MDNS_SRC=mdns_dnssd.c
 endif
 
+if COND_FFMPEG_LEGACY
+FFMPEG_SRC=transcode_legacy.c artwork_legacy.c ffmpeg-compat.h
+else
+FFMPEG_SRC=transcode.c artwork.c
+endif
+
 GPERF_FILES = \
 	daap_query.gperf \
 	rsp_query.gperf \
@@ -105,8 +111,7 @@ forked_daapd_SOURCES = main.c \
 	httpd_streaming.c httpd_streaming.h \
 	http.c http.h \
 	dmap_common.c dmap_common.h \
-	transcode.c transcode.h \
-	artwork.c artwork.h \
+	$(FFMPEG_SRC) \
 	misc.c misc.h \
 	rng.c rng.h \
 	rsp_query.c rsp_query.h \
@@ -125,7 +130,7 @@ forked_daapd_SOURCES = main.c \
 	$(MPD_SRC) \
 	listener.c listener.h \
 	commands.c commands.h \
-	ffmpeg-compat.h mxml-compat.h \
+	mxml-compat.h \
 	$(GPERF_SRC) \
 	$(ANTLR_SRC)