/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/audio/audio.h>
#include "gstrtpqdmdepay.h"
#include "gstrtputils.h"
GST_DEBUG_CATEGORY (rtpqdm2depay_debug);
#define GST_CAT_DEFAULT rtpqdm2depay_debug
static GstStaticPadTemplate gst_rtp_qdm2_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-qdm2")
);
static GstStaticPadTemplate gst_rtp_qdm2_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"audio\", " "encoding-name = (string)\"X-QDM\"")
);
#define gst_rtp_qdm2_depay_parent_class parent_class
G_DEFINE_TYPE (GstRtpQDM2Depay, gst_rtp_qdm2_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
static const guint8 headheader[20] = {
0x0, 0x0, 0x0, 0xc, 0x66, 0x72, 0x6d, 0x61,
0x51, 0x44, 0x4d, 0x32, 0x0, 0x0, 0x0, 0x24,
0x51, 0x44, 0x43, 0x41
};
static void gst_rtp_qdm2_depay_finalize (GObject * object);
static GstStateChangeReturn gst_rtp_qdm2_depay_change_state (GstElement *
element, GstStateChange transition);
static GstBuffer *gst_rtp_qdm2_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
gboolean gst_rtp_qdm2_depay_setcaps (GstRTPBaseDepayload * filter,
GstCaps * caps);
static void
gst_rtp_qdm2_depay_class_init (GstRtpQDM2DepayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_qdm2_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_qdm2_depay_setcaps;
gobject_class->finalize = gst_rtp_qdm2_depay_finalize;
gstelement_class->change_state = gst_rtp_qdm2_depay_change_state;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_qdm2_depay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_qdm2_depay_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP QDM2 depayloader",
"Codec/Depayloader/Network/RTP",
"Extracts QDM2 audio from RTP packets (no RFC)",
"Edward Hervey <bilboed@bilboed.com>");
}
static void
gst_rtp_qdm2_depay_init (GstRtpQDM2Depay * rtpqdm2depay)
{
rtpqdm2depay->adapter = gst_adapter_new ();
}
static void
gst_rtp_qdm2_depay_finalize (GObject * object)
{
GstRtpQDM2Depay *rtpqdm2depay;
rtpqdm2depay = GST_RTP_QDM2_DEPAY (object);
g_object_unref (rtpqdm2depay->adapter);
rtpqdm2depay->adapter = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* only on the sink */
gboolean
gst_rtp_qdm2_depay_setcaps (GstRTPBaseDepayload * filter, GstCaps * caps)
{
GstStructure *structure = gst_caps_get_structure (caps, 0);
gint clock_rate;
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 44100; /* default */
filter->clock_rate = clock_rate;
/* will set caps later */
return TRUE;
}
static void
flush_data (GstRtpQDM2Depay * depay)
{
guint i;
guint avail;
if ((avail = gst_adapter_available (depay->adapter)))
gst_adapter_flush (depay->adapter, avail);
GST_DEBUG ("Flushing %d packets", depay->nbpackets);
for (i = 0; depay->packets[i]; i++) {
QDM2Packet *pack = depay->packets[i];
guint32 crc = 0;
int i = 0;
GstBuffer *buf;
guint8 *data;
/* CRC is the sum of everything (including first bytes) */
data = pack->data;
if (G_UNLIKELY (data == NULL))
continue;
/* If the packet size is bigger than 0xff, we need 2 bytes to store the size */
if (depay->packetsize > 0xff) {
/* Expanded size 0x02 | 0x80 */
data[0] = 0x82;
GST_WRITE_UINT16_BE (data + 1, depay->packetsize - 3);
} else {
data[0] = 0x2;
data[1] = depay->packetsize - 2;
}
/* Calculate CRC */
for (; i < depay->packetsize; i++)
crc += data[i];
GST_DEBUG ("CRC is 0x%x", crc);
/* Write CRC */
if (depay->packetsize > 0xff)
GST_WRITE_UINT16_BE (data + 3, crc);
else
GST_WRITE_UINT16_BE (data + 2, crc);
GST_MEMDUMP ("Extracted packet", data, depay->packetsize);
buf = gst_buffer_new ();
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (0, data, depay->packetsize, 0,
depay->packetsize, data, g_free));
gst_adapter_push (depay->adapter, buf);
pack->data = NULL;
}
}
static void
add_packet (GstRtpQDM2Depay * depay, guint32 pid, guint32 len, guint8 * data)
{
QDM2Packet *packet;
if (G_UNLIKELY (!depay->configured))
return;
GST_DEBUG ("pid:%d, len:%d, data:%p", pid, len, data);
if (G_UNLIKELY (depay->packets[pid] == NULL)) {
depay->packets[pid] = g_malloc0 (sizeof (QDM2Packet));
depay->nbpackets = MAX (depay->nbpackets, pid + 1);
}
packet = depay->packets[pid];
GST_DEBUG ("packet:%p", packet);
GST_DEBUG ("packet->data:%p", packet->data);
if (G_UNLIKELY (packet->data == NULL)) {
packet->data = g_malloc0 (depay->packetsize);
/* We leave space for the header/crc */
if (depay->packetsize > 0xff)
packet->offs = 5;
else
packet->offs = 4;
}
/* Finally copy the data over */
memcpy (packet->data + packet->offs, data, len);
packet->offs += len;
}
static GstBuffer *
gst_rtp_qdm2_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
{
GstRtpQDM2Depay *rtpqdm2depay;
GstBuffer *outbuf = NULL;
guint16 seq;
rtpqdm2depay = GST_RTP_QDM2_DEPAY (depayload);
{
gint payload_len;
guint8 *payload;
guint avail;
guint pos = 0;
payload_len = gst_rtp_buffer_get_payload_len (rtp);
if (payload_len < 3)
goto bad_packet;
payload = gst_rtp_buffer_get_payload (rtp);
seq = gst_rtp_buffer_get_seq (rtp);
if (G_UNLIKELY (seq != rtpqdm2depay->nextseq)) {
GST_DEBUG ("GAP in sequence number, Resetting data !");
/* Flush previous data */
flush_data (rtpqdm2depay);
/* And store new timestamp */
rtpqdm2depay->ptimestamp = rtpqdm2depay->timestamp;
rtpqdm2depay->timestamp = GST_BUFFER_PTS (rtp->buffer);
/* And that previous data will be pushed at the bottom */
}
rtpqdm2depay->nextseq = seq + 1;
GST_DEBUG ("Payload size %d 0x%x sequence:%d", payload_len, payload_len,
seq);
GST_MEMDUMP ("Incoming payload", payload, payload_len);
while (pos < payload_len) {
switch (payload[pos]) {
case 0x80:{
GST_DEBUG ("Unrecognized 0x80 marker, skipping 12 bytes");
pos += 12;
}
break;
case 0xff:
/* HEADERS */
GST_DEBUG ("Headers");
/* Store the incoming timestamp */
rtpqdm2depay->ptimestamp = rtpqdm2depay->timestamp;
rtpqdm2depay->timestamp = GST_BUFFER_PTS (rtp->buffer);
/* flush the internal data if needed */
flush_data (rtpqdm2depay);
if (G_UNLIKELY (!rtpqdm2depay->configured)) {
guint8 *ourdata;
GstBuffer *codecdata;
GstMapInfo cmap;
GstCaps *caps;
/* First bytes are unknown */
GST_MEMDUMP ("Header", payload + pos, 32);
ourdata = payload + pos + 10;
pos += 10;
rtpqdm2depay->channs = GST_READ_UINT32_BE (payload + pos + 4);
rtpqdm2depay->samplerate = GST_READ_UINT32_BE (payload + pos + 8);
rtpqdm2depay->bitrate = GST_READ_UINT32_BE (payload + pos + 12);
rtpqdm2depay->blocksize = GST_READ_UINT32_BE (payload + pos + 16);
rtpqdm2depay->framesize = GST_READ_UINT32_BE (payload + pos + 20);
rtpqdm2depay->packetsize = GST_READ_UINT32_BE (payload + pos + 24);
/* 16 bit empty block (0x02 0x00) */
pos += 30;
GST_DEBUG
("channs:%d, samplerate:%d, bitrate:%d, blocksize:%d, framesize:%d, packetsize:%d",
rtpqdm2depay->channs, rtpqdm2depay->samplerate,
rtpqdm2depay->bitrate, rtpqdm2depay->blocksize,
rtpqdm2depay->framesize, rtpqdm2depay->packetsize);
/* Caps */
codecdata = gst_buffer_new_and_alloc (48);
gst_buffer_map (codecdata, &cmap, GST_MAP_WRITE);
memcpy (cmap.data, headheader, 20);
memcpy (cmap.data + 20, ourdata, 28);
gst_buffer_unmap (codecdata, &cmap);
caps = gst_caps_new_simple ("audio/x-qdm2",
"samplesize", G_TYPE_INT, 16,
"rate", G_TYPE_INT, rtpqdm2depay->samplerate,
"channels", G_TYPE_INT, rtpqdm2depay->channs,
"codec_data", GST_TYPE_BUFFER, codecdata, NULL);
gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), caps);
gst_caps_unref (caps);
rtpqdm2depay->configured = TRUE;
} else {
GST_DEBUG ("Already configured, skipping headers");
pos += 40;
}
break;
default:{
/* Shuffled packet contents */
guint packetid = payload[pos++];
guint packettype = payload[pos++];
guint packlen = payload[pos++];
guint hsize = 2;
GST_DEBUG ("Packet id:%d, type:0x%x, len:%d",
packetid, packettype, packlen);
/* Packets bigger than 0xff bytes have a type with the high bit set */
if (G_UNLIKELY (packettype & 0x80)) {
packettype &= 0x7f;
packlen <<= 8;
packlen |= payload[pos++];
hsize = 3;
GST_DEBUG ("Packet id:%d, type:0x%x, len:%d",
packetid, packettype, packlen);
}
if (packettype > 0x7f) {
GST_ERROR ("HOUSTON WE HAVE A PROBLEM !!!!");
}
add_packet (rtpqdm2depay, packetid, packlen + hsize,
payload + pos - hsize);
pos += packlen;
}
}
}
GST_DEBUG ("final pos %d", pos);
avail = gst_adapter_available (rtpqdm2depay->adapter);
if (G_UNLIKELY (avail)) {
GST_DEBUG ("Pushing out %d bytes of collected data", avail);
outbuf = gst_adapter_take_buffer (rtpqdm2depay->adapter, avail);
GST_BUFFER_PTS (outbuf) = rtpqdm2depay->ptimestamp;
GST_DEBUG ("Outgoing buffer timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (rtpqdm2depay->ptimestamp));
}
}
return outbuf;
/* ERRORS */
bad_packet:
{
GST_ELEMENT_WARNING (rtpqdm2depay, STREAM, DECODE,
(NULL), ("Packet was too short"));
return NULL;
}
}
static GstStateChangeReturn
gst_rtp_qdm2_depay_change_state (GstElement * element,
GstStateChange transition)
{
GstRtpQDM2Depay *rtpqdm2depay;
GstStateChangeReturn ret;
rtpqdm2depay = GST_RTP_QDM2_DEPAY (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_adapter_clear (rtpqdm2depay->adapter);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return ret;
}
gboolean
gst_rtp_qdm2_depay_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (rtpqdm2depay_debug, "rtpqdm2depay", 0,
"RTP QDM2 depayloader");
return gst_element_register (plugin, "rtpqdm2depay",
GST_RANK_SECONDARY, GST_TYPE_RTP_QDM2_DEPAY);
}