v4l2: Add FWHT codec support

The recently added vicodec (virtual codec) V4L driver
uses the Fast Walsh-Hadamard Transform for encoding
and decoding.

Add support for it.

sys/v4l2/Makefile.am

@@ -15,6 +15,7 @@ libgstvideo4linux2_la_SOURCES = gstv4l2.c \
 				gstv4l2transform.c \
 				gstv4l2videodec.c \
 				gstv4l2videoenc.c \
+				gstv4l2fwhtenc.c \
 				gstv4l2h263enc.c \
 				gstv4l2h264enc.c \
 				gstv4l2mpeg4enc.c \
@@ -61,6 +62,7 @@ noinst_HEADERS = \
 	gstv4l2transform.h \
 	gstv4l2videodec.h \
 	gstv4l2videoenc.h \
+	gstv4l2fwhtenc.h \
 	gstv4l2h263enc.h \
 	gstv4l2h264enc.h \
 	gstv4l2mpeg4enc.h \

sys/v4l2/gstv4l2.c

@@ -47,6 +47,7 @@
 #include "gstv4l2sink.h"
 #include "gstv4l2radio.h"
 #include "gstv4l2videodec.h"
+#include "gstv4l2fwhtenc.h"
 #include "gstv4l2h263enc.h"
 #include "gstv4l2h264enc.h"
 #include "gstv4l2mpeg4enc.h"
@@ -185,6 +186,10 @@ gst_v4l2_probe_and_register (GstPlugin * plugin)
       gst_v4l2_video_dec_register (plugin, basename, it->device_path,
           sink_caps, src_caps);
     } else if (gst_v4l2_is_video_enc (sink_caps, src_caps, NULL)) {
+      if (gst_v4l2_is_fwht_enc (sink_caps, src_caps))
+        gst_v4l2_fwht_enc_register (plugin, basename, it->device_path,
+            sink_caps, src_caps);
+
       if (gst_v4l2_is_h264_enc (sink_caps, src_caps))
         gst_v4l2_h264_enc_register (plugin, basename, it->device_path,
             sink_caps, src_caps);

sys/v4l2/gstv4l2fwhtenc.c

@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2018 Collabora Inc.
+ *    Authors:
+ *    Nicolas Dufresne <nicolas.dufresne@collabora.com>
+ *    Ezequiel Garcia <ezequiel@collabora.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "gstv4l2object.h"
+#include "gstv4l2fwhtenc.h"
+
+#include <string.h>
+#include <gst/gst-i18n-plugin.h>
+
+GST_DEBUG_CATEGORY_STATIC (gst_v4l2_fwht_enc_debug);
+#define GST_CAT_DEFAULT gst_v4l2_fwht_enc_debug
+
+static GstStaticCaps src_template_caps = GST_STATIC_CAPS ("video/x-fwht");
+
+enum
+{
+  PROP_0,
+  V4L2_STD_OBJECT_PROPS,
+  /* TODO */
+};
+
+#define gst_v4l2_fwht_enc_parent_class parent_class
+G_DEFINE_TYPE (GstV4l2FWHTEnc, gst_v4l2_fwht_enc, GST_TYPE_V4L2_VIDEO_ENC);
+
+static void
+gst_v4l2_fwht_enc_set_property (GObject * object,
+    guint prop_id, const GValue * value, GParamSpec * pspec)
+{
+  /* TODO */
+}
+
+static void
+gst_v4l2_fwht_enc_get_property (GObject * object,
+    guint prop_id, GValue * value, GParamSpec * pspec)
+{
+  /* TODO */
+}
+
+static void
+gst_v4l2_fwht_enc_init (GstV4l2FWHTEnc * self)
+{
+}
+
+static void
+gst_v4l2_fwht_enc_class_init (GstV4l2FWHTEncClass * klass)
+{
+  GstElementClass *element_class;
+  GObjectClass *gobject_class;
+  GstV4l2VideoEncClass *baseclass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  element_class = (GstElementClass *) klass;
+  gobject_class = (GObjectClass *) klass;
+  baseclass = (GstV4l2VideoEncClass *) (klass);
+
+  GST_DEBUG_CATEGORY_INIT (gst_v4l2_fwht_enc_debug, "v4l2fwhtenc", 0,
+      "V4L2 FWHT Encoder");
+
+  gst_element_class_set_static_metadata (element_class,
+      "V4L2 FWHT Encoder",
+      "Codec/Encoder/Video",
+      "Encode FWHT video streams via V4L2 API",
+      "Ezequiel Garcia <ezequiel@collabora.com");
+
+  gobject_class->set_property =
+      GST_DEBUG_FUNCPTR (gst_v4l2_fwht_enc_set_property);
+  gobject_class->get_property =
+      GST_DEBUG_FUNCPTR (gst_v4l2_fwht_enc_get_property);
+
+  baseclass->codec_name = "FWHT";
+}
+
+/* Probing functions */
+gboolean
+gst_v4l2_is_fwht_enc (GstCaps * sink_caps, GstCaps * src_caps)
+{
+  return gst_v4l2_is_video_enc (sink_caps, src_caps,
+      gst_static_caps_get (&src_template_caps));
+}
+
+void
+gst_v4l2_fwht_enc_register (GstPlugin * plugin, const gchar * basename,
+    const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
+{
+  gst_v4l2_video_enc_register (plugin, GST_TYPE_V4L2_FWHT_ENC,
+      "fwht", basename, device_path, sink_caps,
+      gst_static_caps_get (&src_template_caps), src_caps);
+}

sys/v4l2/gstv4l2fwhtenc.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 Collabora Inc.
+ *    Authors:
+ *    Nicolas Dufresne <nicolas.dufresne@collabora.com>
+ *    Ezequiel Garcia <ezequiel@collabora.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef __GST_V4L2_FWHT_ENC_H__
+#define __GST_V4L2_FWHT_ENC_H__
+
+#include <gst/gst.h>
+#include "gstv4l2videoenc.h"
+
+G_BEGIN_DECLS
+#define GST_TYPE_V4L2_FWHT_ENC \
+  (gst_v4l2_fwht_enc_get_type())
+#define GST_V4L2_FWHT_ENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4L2_FWHT_ENC,GstV4l2FWHTEnc))
+#define GST_V4L2_FWHT_ENC_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4L2_FWHT_ENC,GstV4l2FWHTEncClass))
+#define GST_IS_V4L2_FWHT_ENC(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4L2_FWHT_ENC))
+#define GST_IS_V4L2_FWHT_ENC_CLASS(obj) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4L2_FWHT_ENC))
+typedef struct _GstV4l2FWHTEnc GstV4l2FWHTEnc;
+typedef struct _GstV4l2FWHTEncClass GstV4l2FWHTEncClass;
+
+struct _GstV4l2FWHTEnc
+{
+  GstV4l2VideoEnc parent;
+};
+
+struct _GstV4l2FWHTEncClass
+{
+  GstV4l2VideoEncClass parent_class;
+};
+
+GType gst_v4l2_fwht_enc_get_type (void);
+
+gboolean gst_v4l2_is_fwht_enc (GstCaps * sink_caps, GstCaps * src_caps);
+
+void gst_v4l2_fwht_enc_register (GstPlugin * plugin, const gchar * basename,
+    const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps);
+
+G_END_DECLS
+#endif /* __GST_V4L2_FWHT_ENC_H__ */

sys/v4l2/gstv4l2object.c

@@ -169,6 +169,7 @@ static const GstV4L2FormatDesc gst_v4l2_formats[] = {
   {V4L2_PIX_FMT_PJPG, FALSE, GST_V4L2_CODEC},
   {V4L2_PIX_FMT_DV, FALSE, GST_V4L2_TRANSPORT},
   {V4L2_PIX_FMT_MPEG, FALSE, GST_V4L2_TRANSPORT},
+  {V4L2_PIX_FMT_FWHT, FALSE, GST_V4L2_CODEC},
   {V4L2_PIX_FMT_H264, FALSE, GST_V4L2_CODEC},
   {V4L2_PIX_FMT_H264_NO_SC, FALSE, GST_V4L2_CODEC},
   {V4L2_PIX_FMT_H264_MVC, FALSE, GST_V4L2_CODEC},
@@ -1420,6 +1421,9 @@ gst_v4l2_object_v4l2fourcc_to_bare_struct (guint32 fourcc)
           "mpegversion", G_TYPE_INT, 4, "systemstream",
           G_TYPE_BOOLEAN, FALSE, NULL);
       break;
+    case V4L2_PIX_FMT_FWHT:
+      structure = gst_structure_new_empty ("video/x-fwht");
+      break;
     case V4L2_PIX_FMT_H263:
       structure = gst_structure_new ("video/x-h263",
           "variant", G_TYPE_STRING, "itu", NULL);
@@ -1801,6 +1805,8 @@ gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
             break;
         }
       }
+    } else if (g_str_equal (mimetype, "video/x-fwht")) {
+      fourcc = V4L2_PIX_FMT_FWHT;
     } else if (g_str_equal (mimetype, "video/x-h263")) {
       fourcc = V4L2_PIX_FMT_H263;
     } else if (g_str_equal (mimetype, "video/x-h264")) {

sys/v4l2/gstv4l2videodec.c

@@ -1081,6 +1081,8 @@ G_STMT_START { \
     }
   } else if (gst_structure_has_name (s, "video/x-h263")) {
     SET_META ("H263");
+  } else if (gst_structure_has_name (s, "video/x-fwht")) {
+    SET_META ("FWHT");
   } else if (gst_structure_has_name (s, "video/x-h264")) {
     SET_META ("H264");
   } else if (gst_structure_has_name (s, "video/x-wmv")) {

sys/v4l2/meson.build

@@ -12,6 +12,7 @@ v4l2_sources = [
   'gstv4l2transform.c',
   'gstv4l2videodec.c',
   'gstv4l2videoenc.c',
+  'gstv4l2fwhtenc.c',
   'gstv4l2h263enc.c',
   'gstv4l2h264enc.c',
   'gstv4l2mpeg4enc.c',