Added first unusable code that should become the base element for a new aviparser

Original commit message from CVS:
Added first unusable code that should become the base element for a new
aviparser

1 files changed, 115 insertions, 0 deletions

diff --git a/gst/avi/riff.c b/gst/avi/riff.c
new file mode 100644
index 00000000..5138b8dc
--- /dev/null
+++ b/gst/avi/riff.c
@@ -0,0 +1,115 @@
+/* GStreamer
+ * 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.
+ */
+
+#include "riff.h"
+
+GstRiffParse*
+gst_riff_parse_new (GstPad *pad)
+{
+  GstRiffParse *parse;
+
+  parse = g_new0 (GstRiffParse, 1);
+  parse->pad = pad;
+  parse->bs = gst_bytestream_new (pad);
+
+  return parse;
+}
+
+void
+gst_riff_parse_free (GstRiffParse *parse)
+{
+  gst_bytestream_destroy (parse->bs);
+  g_free (parse);
+}
+
+
+static GstRiffReturn
+gst_riff_parse_handle_sink_event (GstRiffParse *parse)
+{
+  guint32 remaining;
+  GstEvent *event;
+  GstEventType type;
+  GstRiffReturn ret = GST_RIFF_OK;
+
+  gst_bytestream_get_status (parse->bs, &remaining, &event);
+
+  type = event? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
+
+  switch (type) {
+    case GST_EVENT_EOS:
+      ret = GST_RIFF_EOS;
+      break;
+    default:
+      g_warning ("unhandled event %d", type);
+      break;
+  }
+
+  gst_event_unref (event);
+
+  return ret;
+}
+
+GstRiffReturn
+gst_riff_parse_next_chunk (GstRiffParse *parse, guint32 *id, GstBuffer **buf)
+{
+  GstByteStream *bs;
+  guint32 got_bytes;
+  gint skipsize;
+  gst_riff_chunk *chunk;
+
+  bs = parse->bs;
+
+  do {
+    got_bytes = gst_bytestream_peek_bytes (bs, (guint8 **) &chunk, sizeof (gst_riff_chunk));
+    if (got_bytes < sizeof (gst_riff_chunk)) {
+      GstRiffReturn ret;
+      
+      ret = gst_riff_parse_handle_sink_event (parse);
+
+      if (ret == GST_RIFF_EOS)
+	return ret;
+    }
+  } while (got_bytes != sizeof (gst_riff_chunk));
+
+  *id = chunk->id;
+
+  switch (chunk->id) {
+    case GST_RIFF_TAG_RIFF:
+    case GST_RIFF_TAG_LIST:
+      skipsize = sizeof (gst_riff_list);
+      break;
+    default:
+      skipsize = (chunk->size + 8 + 1) & ~1;
+      break;
+  }
+
+  do {
+    got_bytes = gst_bytestream_read (bs, buf, skipsize);
+    if (got_bytes < skipsize) {
+      GstRiffReturn ret;
+      
+      ret = gst_riff_parse_handle_sink_event (parse);
+
+      if (ret == GST_RIFF_EOS)
+	return ret;
+    }
+  } while (got_bytes != skipsize);
+
+  return GST_RIFF_OK;
+}