Revived the mpeg1 video parser, probably badly broken but anyway..

Original commit message from CVS:
Revived the mpeg1 video parser, probably badly broken but anyway..

1 files changed, 419 insertions, 0 deletions

diff --git a/gst/mpeg1videoparse/gstmp1videoparse.c b/gst/mpeg1videoparse/gstmp1videoparse.c
new file mode 100644
index 00000000..74d910e4
--- /dev/null
+++ b/gst/mpeg1videoparse/gstmp1videoparse.c
@@ -0,0 +1,419 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+//#define GST_DEBUG_ENABLED
+#include "gstmp1videoparse.h"
+
+/* Start codes. */
+#define SEQ_START_CODE 0x000001b3
+#define GOP_START_CODE 0x000001b8
+#define PICTURE_START_CODE 0x00000100
+#define SLICE_MIN_START_CODE 0x00000101
+#define SLICE_MAX_START_CODE 0x000001af
+#define EXT_START_CODE 0x000001b5
+#define USER_START_CODE 0x000001b2
+#define SEQUENCE_ERROR_CODE 0x000001b4
+#define SEQ_END_CODE 0x000001b7
+
+/* elementfactory information */
+static GstElementDetails mp1videoparse_details = {
+  "MPEG 1 Video Parser",
+  "Filter/Parser/Video",
+  "Parses and frames MPEG 1 video streams, provides seek",
+  VERSION,
+  "Wim Taymans <wim.taymans@chello.be>",
+  "(C) 2000",
+};
+
+static GstPadTemplate*
+src_factory (void) 
+{
+  return
+    gst_padtemplate_new (
+  	"src",
+  	GST_PAD_SRC,
+  	GST_PAD_ALWAYS,
+	gst_caps_new (
+  	  "mp1videoparse_src",
+    	  "video/mpeg",
+	  gst_props_new (
+    	    "mpegversion",   GST_PROPS_INT (1),
+    	    "systemstream",  GST_PROPS_BOOLEAN (FALSE),
+    	    "sliced",        GST_PROPS_BOOLEAN (TRUE),
+	    NULL)),
+	NULL);
+}
+
+static GstPadTemplate*
+sink_factory (void)
+{
+  return
+    gst_padtemplate_new (
+  	"sink",
+  	GST_PAD_SINK,
+  	GST_PAD_ALWAYS,
+  	gst_caps_new (
+  	  "mp1videoparse_sink",
+    	  "video/mpeg",
+	  gst_props_new (
+    	    "mpegversion",   GST_PROPS_INT (1),
+    	    "systemstream",  GST_PROPS_BOOLEAN (FALSE),
+	    NULL)),
+	NULL);
+}
+
+/* Mp1VideoParse signals and args */
+enum {
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum {
+  ARG_0,
+  /* FILL ME */
+};
+
+static void	gst_mp1videoparse_class_init	(Mp1VideoParseClass *klass);
+static void	gst_mp1videoparse_init		(Mp1VideoParse *mp1videoparse);
+
+static void	gst_mp1videoparse_chain		(GstPad *pad, GstBuffer *buf);
+static void	gst_mp1videoparse_real_chain	(Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad);
+
+static void	gst_mp1videoparse_flush		(Mp1VideoParse *mp1videoparse);
+
+static GstPadTemplate *src_template, *sink_template;
+
+static GstElementClass *parent_class = NULL;
+//static guint gst_mp1videoparse_signals[LAST_SIGNAL] = { 0 };
+
+GType
+mp1videoparse_get_type (void)
+{
+  static GType mp1videoparse_type = 0;
+
+  if (!mp1videoparse_type) {
+    static const GTypeInfo mp1videoparse_info = {
+      sizeof(Mp1VideoParseClass),      NULL,
+      NULL,
+      (GClassInitFunc)gst_mp1videoparse_class_init,
+      NULL,
+      NULL,
+      sizeof(Mp1VideoParse),
+      0,
+      (GInstanceInitFunc)gst_mp1videoparse_init,
+    };
+    mp1videoparse_type = g_type_register_static(GST_TYPE_ELEMENT, "Mp1VideoParse", &mp1videoparse_info, 0);
+  }
+  return mp1videoparse_type;
+}
+
+static void
+gst_mp1videoparse_class_init (Mp1VideoParseClass *klass)
+{
+  GstElementClass *gstelement_class;
+
+  gstelement_class = (GstElementClass*)klass;
+
+  parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
+
+}
+
+static void
+gst_mp1videoparse_init (Mp1VideoParse *mp1videoparse)
+{
+  mp1videoparse->sinkpad = gst_pad_new_from_template (sink_template, "sink");
+  gst_pad_set_caps (mp1videoparse->sinkpad, gst_pad_get_padtemplate_caps (mp1videoparse->sinkpad));
+  gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->sinkpad);
+  gst_pad_set_chain_function(mp1videoparse->sinkpad,gst_mp1videoparse_chain);
+
+  mp1videoparse->srcpad = gst_pad_new_from_template (src_template, "src");
+  gst_pad_set_caps (mp1videoparse->srcpad, gst_pad_get_padtemplate_caps (mp1videoparse->srcpad));
+  gst_element_add_pad(GST_ELEMENT(mp1videoparse),mp1videoparse->srcpad);
+
+  mp1videoparse->partialbuf = NULL;
+  mp1videoparse->need_resync = FALSE;
+  mp1videoparse->last_pts = 0;
+  mp1videoparse->picture_in_buffer = 0;
+}
+
+static gboolean
+mp1videoparse_valid_sync (gulong head)
+{
+  if (head == SEQ_START_CODE)
+    return TRUE;
+  if (head == GOP_START_CODE)
+    return TRUE;
+  if (head == PICTURE_START_CODE)
+    return TRUE;
+  if (head >= SLICE_MIN_START_CODE &&
+      head <= SLICE_MAX_START_CODE)
+    return TRUE;
+  if (head == USER_START_CODE)
+    return TRUE;
+  if (head == EXT_START_CODE)
+    return TRUE;
+
+  return FALSE;
+}
+
+static gint
+mp1videoparse_find_next_gop (Mp1VideoParse *mp1videoparse, GstBuffer *buf)
+{
+  guchar *data = GST_BUFFER_DATA(buf);
+  gulong size = GST_BUFFER_SIZE(buf);
+  gulong offset = 0;
+  gint sync_zeros = 0;
+  gboolean have_sync = FALSE;
+
+  while (offset < size) {
+    guchar byte = *(data+offset);
+    offset++;
+    if (byte == 0) {
+      sync_zeros++;
+    }
+    else if (byte == 1 && sync_zeros >=2 ) {
+      sync_zeros = 0;
+      have_sync = TRUE;
+    }
+    else if (have_sync) {
+      if (byte == (SEQ_START_CODE & 0xff) || byte == (GOP_START_CODE & 0xff)) return offset-4;
+      else {
+        sync_zeros = 0;
+	have_sync = FALSE;
+      }
+    }
+    else {
+      sync_zeros = 0;
+    }
+  }
+
+  return -1;
+}
+
+static void
+gst_mp1videoparse_flush (Mp1VideoParse *mp1videoparse)
+{
+  GST_DEBUG (0,"mp1videoparse: flushing\n");
+  if (mp1videoparse->partialbuf) {
+    gst_buffer_unref(mp1videoparse->partialbuf);
+    mp1videoparse->partialbuf= NULL;
+  }
+  mp1videoparse->need_resync = TRUE;
+  mp1videoparse->in_flush = TRUE;
+  mp1videoparse->picture_in_buffer = 0;
+}
+
+static void
+gst_mp1videoparse_chain (GstPad *pad,GstBuffer *buf)
+{
+  Mp1VideoParse *mp1videoparse;
+
+  g_return_if_fail (pad != NULL);
+  g_return_if_fail (GST_IS_PAD (pad));
+  g_return_if_fail (buf != NULL);
+
+  mp1videoparse = GST_MP1VIDEOPARSE (GST_OBJECT_PARENT (pad));
+
+  gst_mp1videoparse_real_chain(mp1videoparse, buf, mp1videoparse->srcpad);
+}
+
+static void
+gst_mp1videoparse_real_chain (Mp1VideoParse *mp1videoparse, GstBuffer *buf, GstPad *outpad)
+{
+  guchar *data;
+  gulong size, offset = 0;
+  GstBuffer *outbuf;
+  gint sync_state;
+  gboolean have_sync;
+  guchar sync_byte;
+  gulong head;
+  gint sync_pos;
+  guint64 time_stamp;
+  GstBuffer *temp;
+
+//  g_return_if_fail(GST_IS_BUFFER(buf));
+
+
+  time_stamp = GST_BUFFER_TIMESTAMP(buf);
+
+
+  if (GST_BUFFER_FLAG_IS_SET(buf, GST_BUFFER_FLUSH)) {
+    gst_mp1videoparse_flush(mp1videoparse);
+  }
+
+  if (mp1videoparse->partialbuf) {
+    offset = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
+    mp1videoparse->partialbuf = gst_buffer_append(mp1videoparse->partialbuf, buf);
+    gst_buffer_unref(buf);
+  }
+  else {
+    mp1videoparse->partialbuf = buf;
+    offset = 0;
+  }
+
+  data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
+  size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
+
+  GST_DEBUG (0,"mp1videoparse: received buffer of %ld bytes %lld\n",size, GST_BUFFER_TIMESTAMP(buf));
+
+  head = GULONG_FROM_BE(*((gulong *)data));
+
+  GST_DEBUG (0,"mp1videoparse: head is %08lx\n", head);
+
+  if (!mp1videoparse_valid_sync(head) || mp1videoparse->need_resync) {
+    sync_pos = mp1videoparse_find_next_gop(mp1videoparse, mp1videoparse->partialbuf);
+    if (sync_pos != -1) {
+      mp1videoparse->need_resync = FALSE;
+      GST_DEBUG (0,"mp1videoparse: found new gop at %d\n", sync_pos);
+
+      if (sync_pos != 0) {
+        temp = gst_buffer_create_sub(mp1videoparse->partialbuf, sync_pos, size-sync_pos);
+	g_assert(temp != NULL);
+	gst_buffer_unref(mp1videoparse->partialbuf);
+	mp1videoparse->partialbuf = temp;
+        data = GST_BUFFER_DATA(mp1videoparse->partialbuf);
+        size = GST_BUFFER_SIZE(mp1videoparse->partialbuf);
+	offset = 0;
+      }
+    }
+    else {
+      GST_DEBUG (0,"mp1videoparse: could not sync\n");
+      gst_buffer_unref(mp1videoparse->partialbuf);
+      mp1videoparse->partialbuf = NULL;
+      return;
+    }
+  }
+
+  if (mp1videoparse->picture_in_buffer == 1) {
+    mp1videoparse->last_pts = time_stamp;
+  }
+
+  sync_state = 0;
+  have_sync = FALSE;
+
+  GST_DEBUG (0,"mp1videoparse: searching sync\n");
+
+  while (offset < size-1) {
+    sync_byte = *(data + offset);
+    //printf(" %d %02x\n", offset, sync_byte);
+    if (sync_byte == 0) {
+      sync_state++;
+    }
+    else if ((sync_byte == 1) && (sync_state >=2)) {
+      GST_DEBUG (0,"mp1videoparse: code 0x000001%02x\n",data[offset+1]);
+      if (data[offset+1] == (PICTURE_START_CODE & 0xff)) {
+	mp1videoparse->picture_in_buffer++;
+	if (mp1videoparse->picture_in_buffer == 1) {
+          mp1videoparse->last_pts = time_stamp;
+	  sync_state = 0;
+	}
+	else if (mp1videoparse->picture_in_buffer == 2) {
+          have_sync = TRUE;
+          break;
+	}
+	else {
+          GST_DEBUG (0,"mp1videoparse: %d in buffer\n", mp1videoparse->picture_in_buffer);
+          g_assert_not_reached();
+	}
+      }
+      else sync_state = 0;
+    }
+    // something else...
+    else sync_state = 0;
+    // go down the buffer
+    offset++;
+  }
+
+  if (have_sync) {
+    offset -= 2;
+    GST_DEBUG (0,"mp1videoparse: synced at %ld code 0x000001%02x\n",offset,data[offset+3]);
+
+    outbuf = gst_buffer_create_sub(mp1videoparse->partialbuf, 0, offset+4);
+    g_assert(outbuf != NULL);
+    GST_BUFFER_TIMESTAMP(outbuf) = mp1videoparse->last_pts;
+
+    if (mp1videoparse->in_flush) {
+      GST_BUFFER_FLAG_SET(outbuf, GST_BUFFER_FLUSH);
+      mp1videoparse->in_flush = FALSE;
+    }
+
+    GST_DEBUG (0,"mp1videoparse: pushing  %d bytes %llu\n", GST_BUFFER_SIZE(outbuf), GST_BUFFER_TIMESTAMP(outbuf));
+    gst_pad_push(outpad, outbuf);
+    GST_DEBUG (0,"mp1videoparse: pushing  done\n");
+    mp1videoparse->picture_in_buffer = 0;
+
+    temp = gst_buffer_create_sub(mp1videoparse->partialbuf, offset, size-offset);
+    gst_buffer_unref(mp1videoparse->partialbuf);
+    mp1videoparse->partialbuf = temp;
+  }
+  else {
+    mp1videoparse->last_pts = time_stamp;
+  }
+}
+
+/* FIXME
+static GstElementStateReturn 
+gst_mp1videoparse_change_state (GstElement *element) 
+{
+  Mp1VideoParse *mp1videoparse;
+  g_return_val_if_fail(GST_IS_MP1VIDEOPARSE(element),GST_STATE_FAILURE);
+
+  mp1videoparse = GST_MP1VIDEOPARSE(element);
+  GST_DEBUG (0,"mp1videoparse: state pending %d\n", GST_STATE_PENDING(element));
+
+  // if going down into NULL state, clear out buffers
+  if (GST_STATE_PENDING(element) == GST_STATE_READY) {
+    gst_mp1videoparse_flush(mp1videoparse);
+  }
+
+  // if we haven't failed already, give the parent class a chance to ;-)
+  if (GST_ELEMENT_CLASS(parent_class)->change_state)
+    return GST_ELEMENT_CLASS(parent_class)->change_state(element);
+
+  return GST_STATE_SUCCESS;
+}
+*/
+
+static gboolean
+plugin_init (GModule *module, GstPlugin *plugin)
+{
+  GstElementFactory *factory;
+
+  /* create an elementfactory for the mp1videoparse element */
+  factory = gst_elementfactory_new("mp1videoparse",GST_TYPE_MP1VIDEOPARSE,
+                                   &mp1videoparse_details);
+  g_return_val_if_fail(factory != NULL, FALSE);
+
+  src_template = src_factory ();
+  gst_elementfactory_add_padtemplate (factory, src_template);
+
+  sink_template = sink_factory ();
+  gst_elementfactory_add_padtemplate (factory, sink_template);
+
+  gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}
+
+GstPluginDesc plugin_desc = {
+  GST_VERSION_MAJOR,
+  GST_VERSION_MINOR,
+  "mp1videoparse",
+  plugin_init
+};