msdkvp9enc: output raw vp9 stream instead of IVF stream

video/x-vp9 is required in the src pad, however the output includes a
IVF header, which makes the pipeline below doesn't work

  gst-launch-1.0 videotestsrc ! msdkvp9enc ! msdkvp9dec ! fakesink

Since mfx 1.26, the VP9 encoder supports bitstream without IVF header,
so in this patch, the mfx version is checked and msdkvp9enc is enabled
only if mfx 1.26+ is available

sys/msdk/gstmsdk.c

@@ -45,7 +45,9 @@
 #include "gstmsdkmpeg2dec.h"
 #include "gstmsdkmpeg2enc.h"
 #include "gstmsdkvp8dec.h"
+#ifdef USE_MSDK_VP9_ENC
 #include "gstmsdkvp9enc.h"
+#endif
 #include "gstmsdkvc1dec.h"
 #ifdef USE_MSDK_VP9_DEC
 #include "gstmsdkvp9dec.h"
@@ -135,10 +137,10 @@ plugin_init (GstPlugin * plugin)
   ret = gst_element_register (plugin, "msdkvp9dec", GST_RANK_NONE,
       GST_TYPE_MSDKVP9DEC);
 #endif
-
+#ifdef USE_MSDK_VP9_ENC
   ret = gst_element_register (plugin, "msdkvp9enc", GST_RANK_NONE,
       GST_TYPE_MSDKVP9ENC);
-
+#endif
   ret = gst_element_register (plugin, "msdkvpp", GST_RANK_NONE,
       GST_TYPE_MSDKVPP);
 

sys/msdk/gstmsdkvp9enc.c

@@ -111,6 +111,7 @@ gst_msdkvp9enc_set_format (GstMsdkEnc * encoder)
 static gboolean
 gst_msdkvp9enc_configure (GstMsdkEnc * encoder)
 {
+  GstMsdkVP9Enc *vp9enc = GST_MSDKVP9ENC (encoder);
   mfxSession session;
 
   if (encoder->hardware) {
@@ -149,6 +150,13 @@ gst_msdkvp9enc_configure (GstMsdkEnc * encoder)
   /* Enable Extended coding options */
   gst_msdkenc_ensure_extended_coding_options (encoder);
 
+  memset (&vp9enc->ext_vp9, 0, sizeof (vp9enc->ext_vp9));
+  vp9enc->ext_vp9.Header.BufferId = MFX_EXTBUFF_VP9_PARAM;
+  vp9enc->ext_vp9.Header.BufferSz = sizeof (vp9enc->ext_vp9);
+  vp9enc->ext_vp9.WriteIVFHeaders = MFX_CODINGOPTION_OFF;
+
+  gst_msdkenc_add_extra_param (encoder, (mfxExtBuffer *) & vp9enc->ext_vp9);
+
   return TRUE;
 }
 

sys/msdk/gstmsdkvp9enc.h

@@ -55,6 +55,8 @@ struct _GstMsdkVP9Enc
   GstMsdkEnc base;
 
   gint profile;
+
+  mfxExtVP9Param ext_vp9;
 };
 
 struct _GstMsdkVP9EncClass

sys/msdk/meson.build

@@ -18,7 +18,6 @@ msdk_sources = [
   'gstmsdkvc1dec.c',
   'gstmsdkvideomemory.c',
   'gstmsdkvp8dec.c',
-  'gstmsdkvp9enc.c',
   'gstmsdkvpp.c',
   'gstmsdkvpputil.c',
   'msdk-enums.c',
@@ -78,6 +77,22 @@ if cxx.has_header('mfxvp9.h', args: '-I' + mfx_incdir)
   cdata.set10('USE_MSDK_VP9_DEC', 1)
 endif
 
+# mfx 1.26+ is required to support raw VP9 stream
+mfx_ver126_check_code = '''
+#include <mfxdefs.h>
+#if MFX_VERSION < 1026
+#error "The current version of mfx doesn't support raw vp9 stream"
+#endif'
+'''
+
+have_mfx_ver126 = cc.compiles(mfx_ver126_check_code,
+                include_directories : [configinc, mfx_inc])
+
+if have_mfx_ver126
+  msdk_sources += [ 'gstmsdkvp9enc.c' ]
+  cdata.set10('USE_MSDK_VP9_ENC', 1)
+endif
+
 if host_machine.system() == 'windows'
   if cc.get_id() != 'msvc' and msdk_option.enabled()
     error('msdk plugin can only be built with MSVC')