videoparsers: Add dirac parser

1 files changed, 352 insertions, 0 deletions

diff --git a/gst/videoparsers/gstdiracparse.c b/gst/videoparsers/gstdiracparse.c
new file mode 100644
index 000000000..4ddcd3a5a
--- /dev/null
+++ b/gst/videoparsers/gstdiracparse.c
@@ -0,0 +1,352 @@
+/* GStreamer
+ * Copyright (C) 2010 David Schleef <ds@schleef.org>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+/**
+ * SECTION:element-gstdiracparse
+ *
+ * The gstdiracparse element does FIXME stuff.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch -v fakesrc ! gstdiracparse ! FIXME ! fakesink
+ * ]|
+ * FIXME Describe what the pipeline does.
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <gst/base/gstbytereader.h>
+#include <gst/baseparse/gstbaseparse.h>
+#include "gstdiracparse.h"
+
+/* prototypes */
+
+
+static void gst_dirac_parse_set_property (GObject * object,
+    guint property_id, const GValue * value, GParamSpec * pspec);
+static void gst_dirac_parse_get_property (GObject * object,
+    guint property_id, GValue * value, GParamSpec * pspec);
+static void gst_dirac_parse_dispose (GObject * object);
+static void gst_dirac_parse_finalize (GObject * object);
+
+static gboolean gst_dirac_parse_start (GstBaseParse * parse);
+static gboolean gst_dirac_parse_stop (GstBaseParse * parse);
+static gboolean gst_dirac_parse_set_sink_caps (GstBaseParse * parse,
+    GstCaps * caps);
+static gboolean gst_dirac_parse_check_valid_frame (GstBaseParse * parse,
+    GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
+static GstFlowReturn gst_dirac_parse_parse_frame (GstBaseParse * parse,
+    GstBaseParseFrame * frame);
+static gboolean gst_dirac_parse_convert (GstBaseParse * parse,
+    GstFormat src_format, gint64 src_value, GstFormat dest_format,
+    gint64 * dest_value);
+static gboolean gst_dirac_parse_event (GstBaseParse * parse, GstEvent * event);
+static gboolean gst_dirac_parse_src_event (GstBaseParse * parse,
+    GstEvent * event);
+static GstFlowReturn gst_dirac_parse_pre_push_frame (GstBaseParse * parse,
+    GstBaseParseFrame * frame);
+
+enum
+{
+  PROP_0
+};
+
+/* pad templates */
+
+static GstStaticPadTemplate gst_dirac_parse_sink_template =
+GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/unknown")
+    );
+
+static GstStaticPadTemplate gst_dirac_parse_src_template =
+GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("application/unknown")
+    );
+
+/* class initialization */
+
+GST_BOILERPLATE (GstDiracParse, gst_dirac_parse, GstBaseParse,
+    GST_TYPE_BASE_PARSE);
+
+static void
+gst_dirac_parse_base_init (gpointer g_class)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_dirac_parse_src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_dirac_parse_sink_template));
+
+  gst_element_class_set_details_simple (element_class, "FIXME",
+      "Generic", "FIXME", "David Schleef <ds@schleef.org>");
+}
+
+static void
+gst_dirac_parse_class_init (GstDiracParseClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstBaseParseClass *base_parse_class = GST_BASE_PARSE_CLASS (klass);
+
+  gobject_class->set_property = gst_dirac_parse_set_property;
+  gobject_class->get_property = gst_dirac_parse_get_property;
+  gobject_class->dispose = gst_dirac_parse_dispose;
+  gobject_class->finalize = gst_dirac_parse_finalize;
+  base_parse_class->start = GST_DEBUG_FUNCPTR (gst_dirac_parse_start);
+  base_parse_class->stop = GST_DEBUG_FUNCPTR (gst_dirac_parse_stop);
+  base_parse_class->set_sink_caps =
+      GST_DEBUG_FUNCPTR (gst_dirac_parse_set_sink_caps);
+  base_parse_class->check_valid_frame =
+      GST_DEBUG_FUNCPTR (gst_dirac_parse_check_valid_frame);
+  base_parse_class->parse_frame =
+      GST_DEBUG_FUNCPTR (gst_dirac_parse_parse_frame);
+  base_parse_class->convert = GST_DEBUG_FUNCPTR (gst_dirac_parse_convert);
+  base_parse_class->event = GST_DEBUG_FUNCPTR (gst_dirac_parse_event);
+  base_parse_class->src_event = GST_DEBUG_FUNCPTR (gst_dirac_parse_src_event);
+  base_parse_class->pre_push_frame =
+      GST_DEBUG_FUNCPTR (gst_dirac_parse_pre_push_frame);
+
+}
+
+static void
+gst_dirac_parse_init (GstDiracParse * diracparse,
+    GstDiracParseClass * diracparse_class)
+{
+  gst_base_parse_set_min_frame_size (GST_BASE_PARSE (diracparse), 13);
+
+}
+
+void
+gst_dirac_parse_set_property (GObject * object, guint property_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstDiracParse *diracparse;
+
+  g_return_if_fail (GST_IS_DIRAC_PARSE (object));
+  diracparse = GST_DIRAC_PARSE (object);
+
+  switch (property_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+  }
+}
+
+void
+gst_dirac_parse_get_property (GObject * object, guint property_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstDiracParse *diracparse;
+
+  g_return_if_fail (GST_IS_DIRAC_PARSE (object));
+  diracparse = GST_DIRAC_PARSE (object);
+
+  switch (property_id) {
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+  }
+}
+
+void
+gst_dirac_parse_dispose (GObject * object)
+{
+  GstDiracParse *diracparse;
+
+  g_return_if_fail (GST_IS_DIRAC_PARSE (object));
+  diracparse = GST_DIRAC_PARSE (object);
+
+  /* clean up as possible.  may be called multiple times */
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+void
+gst_dirac_parse_finalize (GObject * object)
+{
+  GstDiracParse *diracparse;
+
+  g_return_if_fail (GST_IS_DIRAC_PARSE (object));
+  diracparse = GST_DIRAC_PARSE (object);
+
+  /* clean up object here */
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+
+static gboolean
+gst_dirac_parse_start (GstBaseParse * parse)
+{
+  return TRUE;
+}
+
+static gboolean
+gst_dirac_parse_stop (GstBaseParse * parse)
+{
+  return TRUE;
+}
+
+static gboolean
+gst_dirac_parse_set_sink_caps (GstBaseParse * parse, GstCaps * caps)
+{
+  /* Called when sink caps are set */
+  return TRUE;
+}
+
+static gboolean
+gst_dirac_parse_frame_header (GstDiracParse * diracparse,
+    GstBuffer * buffer, guint * framesize)
+{
+  int next_header;
+
+  next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (buffer) + 5);
+
+  *framesize = next_header;
+  return TRUE;
+}
+
+static gboolean
+gst_dirac_parse_check_valid_frame (GstBaseParse * parse,
+    GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
+{
+  GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (frame->buffer);
+  GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
+  int off;
+  guint32 next_header;
+  gboolean sync;
+  gboolean drain;
+
+  if (G_UNLIKELY (GST_BUFFER_SIZE (frame->buffer) < 13))
+    return FALSE;
+
+  off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
+      0x42424344, 0, GST_BUFFER_SIZE (frame->buffer));
+
+  if (off < 0) {
+    *skipsize = GST_BUFFER_SIZE (frame->buffer) - 3;
+    return FALSE;
+  }
+
+  GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
+
+  if (off > 0) {
+    GST_ERROR ("skipping %d", off);
+    *skipsize = off;
+    return FALSE;
+  }
+
+  if (!gst_dirac_parse_frame_header (diracparse, frame->buffer, framesize)) {
+    GST_ERROR ("bad header");
+    *skipsize = 3;
+    return FALSE;
+  }
+
+  GST_LOG ("framesize %d", *framesize);
+
+  sync = GST_BASE_PARSE_FRAME_SYNC (frame);
+  drain = GST_BASE_PARSE_FRAME_DRAIN (frame);
+
+  if (!sync && !drain) {
+    guint32 next_sync_word;
+
+    next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (frame->buffer) + 5);
+    GST_LOG ("next header %d", next_header);
+
+    if (!gst_byte_reader_skip (&reader, next_header) ||
+        !gst_byte_reader_get_uint32_be (&reader, &next_sync_word)) {
+      gst_base_parse_set_min_frame_size (parse, next_header + 4);
+      *skipsize = 0;
+      return FALSE;
+    } else {
+      if (next_sync_word != 0x42424344) {
+        *skipsize = 3;
+        return FALSE;
+      } else {
+        gst_base_parse_set_min_frame_size (parse, next_header);
+
+      }
+    }
+  }
+
+  return TRUE;
+}
+
+static GstFlowReturn
+gst_dirac_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
+{
+  //GstDiracParse * diracparse = GST_DIRAC_PARSE (parse);
+
+  /* Called when processing incoming buffers.  Function should parse
+     a checked frame. */
+  /* MUST implement */
+
+  if (GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)) == NULL) {
+    GstCaps *caps = gst_caps_new_simple ("video/x-dirac", NULL);
+
+    gst_buffer_set_caps (frame->buffer, caps);
+    gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
+    gst_caps_unref (caps);
+
+  }
+
+  gst_base_parse_set_min_frame_size (parse, 13);
+
+  return GST_FLOW_OK;
+}
+
+static gboolean
+gst_dirac_parse_convert (GstBaseParse * parse, GstFormat src_format,
+    gint64 src_value, GstFormat dest_format, gint64 * dest_value)
+{
+  /* Convert between formats */
+
+  return FALSE;
+}
+
+static gboolean
+gst_dirac_parse_event (GstBaseParse * parse, GstEvent * event)
+{
+  /* Sink pad event handler */
+
+  return FALSE;
+}
+
+static gboolean
+gst_dirac_parse_src_event (GstBaseParse * parse, GstEvent * event)
+{
+  /* Src pad event handler */
+
+  return FALSE;
+}
+
+static GstFlowReturn
+gst_dirac_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
+{
+
+  return GST_FLOW_OK;
+}