rtp: New QDM2 rtp depayloader.

Reverse-engineered by comparing:
* A rtp hinted file provided by DarwinStreamingServer
* The output procued by DSS for that same file

Also used various streaming sources available on the internet to fine-tune
the code.

The header/codec_data extraction methods are from FFMpeg (LGPL).

1 files changed, 82 insertions, 0 deletions

diff --git a/gst/rtp/gstrtpqdmdepay.h b/gst/rtp/gstrtpqdmdepay.h
new file mode 100644
index 00000000..815cd4d0
--- /dev/null
+++ b/gst/rtp/gstrtpqdmdepay.h
@@ -0,0 +1,82 @@
+/* GStreamer
+ * Copyright (C) <2009> Edward Hervey <bilboed@bilboed.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_RTP_QDM2_DEPAY_H__
+#define __GST_RTP_QDM2_DEPAY_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+#include <gst/rtp/gstbasertpdepayload.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_RTP_QDM2_DEPAY \
+  (gst_rtp_qdm2_depay_get_type())
+#define GST_RTP_QDM2_DEPAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_RTP_QDM2_DEPAY,GstRtpQDM2Depay))
+#define GST_RTP_QDM2_DEPAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_RTP_QDM2_DEPAY,GstRtpQDM2DepayClass))
+#define GST_IS_RTP_QDM2_DEPAY(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_RTP_QDM2_DEPAY))
+#define GST_IS_RTP_QDM2_DEPAY_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_RTP_QDM2_DEPAY))
+
+typedef struct _GstRtpQDM2Depay GstRtpQDM2Depay;
+typedef struct _GstRtpQDM2DepayClass GstRtpQDM2DepayClass;
+
+typedef struct _QDM2Packet {
+  guint8* data;
+  guint offs;		/* Starts at 4 to give room for the prefix */
+} QDM2Packet;
+
+#define MAX_SCRAMBLED_PACKETS 64
+
+struct _GstRtpQDM2Depay
+{
+  GstBaseRTPDepayload depayload;
+
+  GstAdapter *adapter;
+
+  gboolean configured;
+
+  GstClockTime timestamp; /* Timestamp of current incoming data */
+  GstClockTime ptimestamp; /* Timestamp of data stored in the adapter */
+
+  guint32 channs;
+  guint32 samplerate;
+  guint32 bitrate;
+  guint32 blocksize;
+  guint32 framesize;
+  guint32 packetsize;
+
+  guint nbpackets;	/* Number of packets to unscramble */
+
+  QDM2Packet *packets[MAX_SCRAMBLED_PACKETS];
+};
+
+struct _GstRtpQDM2DepayClass
+{
+  GstBaseRTPDepayloadClass parent_class;
+};
+
+gboolean gst_rtp_qdm2_depay_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_RTP_QDM2_DEPAY_H__ */