From fbbc07ce53e884b1603461ee5642d5f02788678d Mon Sep 17 00:00:00 2001
From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Date: Thu, 21 Mar 2019 16:32:44 +0100
Subject: [PATCH] cmake/FindFFMPEG.cmake: use pkgconfig

ffmpeg has too many optional dependencies (opus, openssl, ...) instead
of trying to find them all one by one, use pkg-config to get them and
fallback on current mechanism

Fixes:
 - http://autobuild.buildroot.org/results/2b99fabd798db84a0fce26ad696c58e54c6ff626
 - http://autobuild.buildroot.org/results/95e410e5ab34c6d4626a58f97c0d2d5e6829a300

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved (and backported) from:
https://github.com/gerbera/gerbera/commit/fbbc07ce53e884b1603461ee5642d5f02788678d]
---
 cmake/FindFFMPEG.cmake | 147 +++++++++++++++++++++--------------------
 1 file changed, 75 insertions(+), 72 deletions(-)

diff --git a/cmake/FindFFMPEG.cmake b/cmake/FindFFMPEG.cmake
index 0a4a409f..9548b566 100644
--- a/cmake/FindFFMPEG.cmake
+++ b/cmake/FindFFMPEG.cmake
@@ -82,70 +82,76 @@ ENDIF (NOT FFMPEG_INCLUDE_DIR)
 # ffmpeg uses relative includes such as <ffmpeg/avformat.h> or <libavcodec/avformat.h>
 get_filename_component(FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_DIR} ABSOLUTE)
 
-FIND_LIBRARY(FFMPEG_avformat_LIBRARY avformat
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_avcodec_LIBRARY avcodec
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_avutil_LIBRARY avutil
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_swresample_LIBRARY swresample
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_vorbis_LIBRARY vorbis
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_dc1394_LIBRARY dc1394_control
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_vorbisenc_LIBRARY vorbisenc
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_theora_LIBRARY theora
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_dts_LIBRARY dts
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_gsm_LIBRARY gsm
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_swscale_LIBRARY swscale
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_z_LIBRARY z
-        /usr/local/lib
-        /usr/lib
-        )
-
-FIND_LIBRARY(FFMPEG_bz2_LIBRARY bz2
-        /usr/local/lib
-        /usr/lib
-        )
+CHECK_STRUCT_HAS_MEMBER("struct AVStream" codecpar libavformat/avformat.h HAVE_AVSTREAM_CODECPAR LANGUAGE C)
+
+FIND_PACKAGE(PkgConfig QUIET)
+PKG_CHECK_MODULES(FFMPEG QUIET libavformat libavutil)
+IF (NOT FFMPEG_FOUND)
+	FIND_LIBRARY(FFMPEG_avformat_LIBRARY avformat
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_avcodec_LIBRARY avcodec
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_avutil_LIBRARY avutil
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_swresample_LIBRARY swresample
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_vorbis_LIBRARY vorbis
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_dc1394_LIBRARY dc1394_control
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_vorbisenc_LIBRARY vorbisenc
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_theora_LIBRARY theora
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_dts_LIBRARY dts
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_gsm_LIBRARY gsm
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_swscale_LIBRARY swscale
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_z_LIBRARY z
+		/usr/local/lib
+		/usr/lib
+		)
+
+	FIND_LIBRARY(FFMPEG_bz2_LIBRARY bz2
+		/usr/local/lib
+		/usr/lib
+		)
+ENDIF(NOT FFMPEG_FOUND)
 
 SET(FFMPEG_LIBRARIES)
 IF (FFMPEG_INCLUDE_DIR)
@@ -205,9 +211,6 @@ IF (FFMPEG_INCLUDE_DIR)
                 ENDIF (FFMPEG_bz2_LIBRARY)
 
                 SET(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} CACHE INTERNAL "All presently found FFMPEG libraries.")
-
-                CHECK_STRUCT_HAS_MEMBER("struct AVStream" codecpar libavformat/avformat.h HAVE_AVSTREAM_CODECPAR LANGUAGE C)
-
             ENDIF (FFMPEG_avutil_LIBRARY)
         ENDIF (FFMPEG_avcodec_LIBRARY)
     ENDIF (FFMPEG_avformat_LIBRARY)