Add a GStreamer-based decoder module

GStreamer is a cross-platform multimedia processing
framework for audio/video postprocess/capture/
encode/decode/render.

This module is intended for Audio/Video decoding using
the available GStreamer plugins present in the system.
Currently this module supports only video decoding
and can be extended to audio decoding as well.
ZeroCopy is currently not supported and must be added.

Codecs currently supported are h264, mpeg4, vp8, mpeg2,
flashvideo, wmv1/2/3, vc1.
Signed-off-by: Vikram Fugro <vikram.fugro@gmail.com>
Signed-off-by: Jean-Baptiste <jb@videolan.org>

NEWS

@@ -27,6 +27,7 @@ Decoder:
  * New jpeg image decoder
  * Add tx3g subtitles decoder
  * Add Media Foundation Transform decoder
+ * Add decoder module based on GStreamer. Currently supports only video decode.
 
 Encoder:
  * Support for MPEG-2 encoding using x262

configure.ac

@@ -2255,6 +2255,26 @@ PKG_CHECK_EXISTS([libavutil], [
 ])
 AC_MSG_RESULT([${avfork}])
 
+dnl
+dnl gstreamer stuff
+dnl
+AC_ARG_ENABLE(gst-decode,
+  [  --enable-gst-decode     GStreamer based decoding support (currently supports only video decoding) (default auto)])
+
+have_gst_decode="no"
+AS_IF([test "${enable_gst_decode}" != "no"], [
+  PKG_CHECK_MODULES([GST_APP], [gstreamer-app-1.0], [
+    PKG_CHECK_MODULES([GST_VIDEO], [gstreamer-video-1.0], [
+      have_gst_decode="yes"
+    ], [
+      AC_MSG_WARN([${GST_VIDEO_PKG_ERRORS}. GStreamer decoder module will not be built.])
+    ])
+  ], [
+    AC_MSG_WARN([${GST_APP_PKG_ERRORS}. GStreamer modules will not be built.])
+  ])
+])
+AM_CONDITIONAL([HAVE_GST_DECODE], [test "${have_gst_decode}" = "yes"])
+
 dnl
 dnl  avcodec decoder/encoder plugin
 dnl

modules/MODULES_LIST

@@ -151,6 +151,7 @@ $Id$
  * grain: Grain Video filter
  * grey_yuv: grayscale to others conversion module
  * growl: announce currently playing stream to growl
+ * gstdecode: GStreamer based decoder module.
  * h264: H264 decoder
  * headphone_channel_mixer:  headphone channel mixer with virtual spatialization effect
  * hevc: HEVC demuxer

modules/codec/Makefile.am

@@ -470,3 +470,10 @@ libquicktime_plugin_la_LDFLAGS = $(AM_LDFLAGS) -rpath '$(codecdir)'
 libquicktime_plugin_la_LIBADD = $(LIBM)
 EXTRA_LTLIBRARIES += libquicktime_plugin.la
 codec_LTLIBRARIES += $(LTLIBquicktime)
+
+libgstdecode_plugin_la_SOURCES = codec/gstdecode.c
+libgstdecode_plugin_la_CFLAGS = $(AM_CFLAGS) $(GST_VIDEO_CFLAGS) $(GST_APP_CFLAGS)
+libgstdecode_plugin_la_LIBADD = $(GST_VIDEO_LIBS) $(GST_APP_LIBS)
+if HAVE_GST_DECODE
+codec_LTLIBRARIES += libgstdecode_plugin.la
+endif

po/POTFILES.in

@@ -372,6 +372,7 @@ modules/codec/fdkaac.c
 modules/codec/flac.c
 modules/codec/fluidsynth.c
 modules/codec/g711.c
+modules/codec/gstdecode.c
 modules/codec/jpeg.c
 modules/codec/kate.c
 modules/codec/libass.c