gstreamer/gst/rtp/gstrtpmp2tdepay.c
Tim-Philipp Müller 6717c86061 rtp: depayloaders: implement process_rtp_packet() vfunc
For more optimised RTP packet handling: means we don't
need to map the input buffer again but can just re-use
the mapping the base class has already done.

https://bugzilla.gnome.org/show_bug.cgi?id=750235
2015-07-12 14:28:29 +01:00

239 lines
6.9 KiB
C

/* GStreamer
* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.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 <gst/rtp/gstrtpbuffer.h>
#include <string.h>
#include "gstrtpmp2tdepay.h"
/* RtpMP2TDepay signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_SKIP_FIRST_BYTES 0
enum
{
PROP_0,
PROP_SKIP_FIRST_BYTES
};
static GstStaticPadTemplate gst_rtp_mp2t_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpegts,"
"packetsize=(int)188," "systemstream=(boolean)true")
);
static GstStaticPadTemplate gst_rtp_mp2t_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"video\", "
"clock-rate = (int) [1, MAX ], "
"encoding-name = (string) { MP2T, MP2T-ES } ;"
/* All optional parameters
*
* "profile-level-id=[1,MAX]"
* "config="
*/
"application/x-rtp, "
"media = (string) \"video\", "
"payload = (int) " GST_RTP_PAYLOAD_MP2T_STRING ", "
"clock-rate = (int) [1, MAX ]")
);
G_DEFINE_TYPE (GstRtpMP2TDepay, gst_rtp_mp2t_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
static gboolean gst_rtp_mp2t_depay_setcaps (GstRTPBaseDepayload * depayload,
GstCaps * caps);
static GstBuffer *gst_rtp_mp2t_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
static void gst_rtp_mp2t_depay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_mp2t_depay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_rtp_mp2t_depay_class_init (GstRtpMP2TDepayClass * 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_mp2t_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_mp2t_depay_setcaps;
gobject_class->set_property = gst_rtp_mp2t_depay_set_property;
gobject_class->get_property = gst_rtp_mp2t_depay_get_property;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_mp2t_depay_src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_rtp_mp2t_depay_sink_template));
gst_element_class_set_static_metadata (gstelement_class,
"RTP MPEG Transport Stream depayloader", "Codec/Depayloader/Network/RTP",
"Extracts MPEG2 TS from RTP packets (RFC 2250)",
"Wim Taymans <wim.taymans@gmail.com>, "
"Thijs Vermeir <thijs.vermeir@barco.com>");
g_object_class_install_property (gobject_class, PROP_SKIP_FIRST_BYTES,
g_param_spec_uint ("skip-first-bytes",
"Skip first bytes",
"The amount of bytes that need to be skipped at the beginning of the payload",
0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_rtp_mp2t_depay_init (GstRtpMP2TDepay * rtpmp2tdepay)
{
rtpmp2tdepay->skip_first_bytes = DEFAULT_SKIP_FIRST_BYTES;
}
static gboolean
gst_rtp_mp2t_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
{
GstCaps *srccaps;
GstStructure *structure;
gint clock_rate;
gboolean res;
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
clock_rate = 90000; /* default */
depayload->clock_rate = clock_rate;
srccaps = gst_caps_new_simple ("video/mpegts",
"packetsize", G_TYPE_INT, 188,
"systemstream", G_TYPE_BOOLEAN, TRUE, NULL);
res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
gst_caps_unref (srccaps);
return res;
}
static GstBuffer *
gst_rtp_mp2t_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
{
GstRtpMP2TDepay *rtpmp2tdepay;
GstBuffer *outbuf;
gint payload_len, leftover;
rtpmp2tdepay = GST_RTP_MP2T_DEPAY (depayload);
payload_len = gst_rtp_buffer_get_payload_len (rtp);
if (G_UNLIKELY (payload_len <= rtpmp2tdepay->skip_first_bytes))
goto empty_packet;
payload_len -= rtpmp2tdepay->skip_first_bytes;
/* RFC 2250
*
* 2. Encapsulation of MPEG System and Transport Streams
*
* For MPEG2 Transport Streams the RTP payload will contain an integral
* number of MPEG transport packets.
*/
leftover = payload_len % 188;
if (G_UNLIKELY (leftover)) {
GST_WARNING ("We don't have an integral number of buffers (leftover: %d)",
leftover);
payload_len -= leftover;
}
outbuf =
gst_rtp_buffer_get_payload_subbuffer (rtp,
rtpmp2tdepay->skip_first_bytes, payload_len);
if (outbuf)
GST_DEBUG ("gst_rtp_mp2t_depay_chain: pushing buffer of size %"
G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));
return outbuf;
/* ERRORS */
empty_packet:
{
GST_ELEMENT_WARNING (rtpmp2tdepay, STREAM, DECODE,
(NULL), ("Packet was empty"));
return NULL;
}
}
static void
gst_rtp_mp2t_depay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpMP2TDepay *rtpmp2tdepay;
rtpmp2tdepay = GST_RTP_MP2T_DEPAY (object);
switch (prop_id) {
case PROP_SKIP_FIRST_BYTES:
rtpmp2tdepay->skip_first_bytes = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_mp2t_depay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpMP2TDepay *rtpmp2tdepay;
rtpmp2tdepay = GST_RTP_MP2T_DEPAY (object);
switch (prop_id) {
case PROP_SKIP_FIRST_BYTES:
g_value_set_uint (value, rtpmp2tdepay->skip_first_bytes);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_rtp_mp2t_depay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpmp2tdepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_MP2T_DEPAY);
}