codec/mmal: Add mmal based decoder plugin

This plugin is capable of decoding MPEG-2 and H264 video through the Multi
Media Abstraction Layer (MMAL) by Broadcom. It is supported by recent Broadcom
SoCs and found on the widely spread Raspberry Pi.
Signed-off-by: Dennis Hamester <dennis.hamester@gmail.com>
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

NEWS

@@ -28,6 +28,7 @@ Decoder:
  * Add tx3g subtitles decoder
  * Add Media Foundation Transform decoder
  * Add decoder module based on GStreamer. Currently supports only video decode.
+ * Add mmal based mpeg2/h264 decoder
 
 Encoder:
  * Support for MPEG-2 encoding using x262

configure.ac

@@ -2146,6 +2146,33 @@ then
   VLC_ADD_CFLAGS([omxil omxil_vout],[-DRPI_OMX])
 fi
 
+dnl
+dnl MMAL codec plugin
+dnl
+AC_ARG_ENABLE(mmal-codec,
+  AS_HELP_STRING([--enable-mmal-codec],
+    [Multi-Media Abstraction Layer (MMAL) based codec plugin for Raspberry Pi (default enable)]))
+if test "${enable_mmal_codec}" != "no"; then
+  VLC_SAVE_FLAGS
+  LDFLAGS="${LDFLAGS} -L/opt/vc/lib"
+  CPPFLAGS="${CPPFLAGS} -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vcos/linux"
+  AC_CHECK_HEADERS(interface/mmal/mmal.h,
+    [ AC_CHECK_LIB(bcm_host, bcm_host_init, [
+        VLC_ADD_PLUGIN([mmal_codec])
+        VLC_ADD_LDFLAGS([mmal_codec],[ -L/opt/vc/lib ])
+        VLC_ADD_CFLAGS([mmal_codec],[ -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vcos/linux ])
+        VLC_ADD_LIBS([mmal_codec],[ -lbcm_host -lmmal ]) ], [
+          AS_IF([test "${enable_mmal_codec}" = "yes"],
+            [ AC_MSG_ERROR([Cannot find bcm library...]) ],
+            [ AC_MSG_WARN([Cannot find bcm library...]) ])
+          ],
+        [])
+    ] , [ AS_IF([test "${enable_mmal_codec}" = "yes"],
+      [ AC_MSG_ERROR([Cannot find development headers for mmal...]) ],
+      [ AC_MSG_WARN([Cannot find development headers for mmal...]) ]) ])
+  VLC_RESTORE_FLAGS
+fi
+
 dnl
 dnl CrystalHD codec plugin
 dnl

modules/MODULES_LIST

@@ -206,6 +206,7 @@ $Id$
  * mirror: mirror video filter
  * mjpeg: a demuxer for multipart and concatenated JPEG data
  * mkv: Matroska demuxer
+ * mmal_codec: mmal based video decoder
  * mmal_vout: mmal based video renderer
  * mmdevice: Windows Audio Session API audio output using MMDevice
  * mod: MOD demuxer

modules/codec/Makefile.am

@@ -374,6 +374,16 @@ codec_LTLIBRARIES += libiomx_plugin.la libmediacodec_plugin.la
 endif
 
 
+### MMAL ###
+
+libmmal_codec_plugin_la_SOURCES = codec/mmal.c
+libmmal_codec_plugin_la_CFLAGS = $(AM_CFLAGS) $(CFLAGS_mmal_codec)
+libmmal_codec_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(codecdir)' $(LDFLAGS_mmal_codec)
+libmmal_codec_plugin_la_LIBADD = $(LIBS_mmal_codec)
+EXTRA_LTLIBRARIES += libmmal_codec_plugin.la
+codec_LTLIBRARIES += $(LTLIBmmal_codec)
+
+
 ### X26x encoders ###
 
 libx265_plugin_la_SOURCES = codec/x265.c

po/POTFILES.in

@@ -379,6 +379,7 @@ modules/codec/libass.c
 modules/codec/libmpeg2.c
 modules/codec/lpcm.c
 modules/codec/mft.c
+modules/codec/mmal.c
 modules/codec/mpeg_audio.c
 modules/codec/omxil/android_mediacodec.c
 modules/codec/omxil/omxil.c