gstreamer/gst/rtp/gstrtpmp1sdepay.c
2021-03-29 12:45:22 +02:00

139 lines
4.2 KiB
C

/* GStreamer
* Copyright (C) <2008> 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 "gstrtpelements.h"
#include "gstrtpmp1sdepay.h"
#include "gstrtputils.h"
/* RtpMP1SDepay signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_LAST
};
static GstStaticPadTemplate gst_rtp_mp1s_depay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg,systemstream=(boolean)true")
);
/* The spec says video/MP1S but I have seen streams with other/MP1S so we will
* allow them both */
static GstStaticPadTemplate gst_rtp_mp1s_depay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
"media = (string) \"other\", "
"clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"MP1S\";"
"application/x-rtp, "
"media = (string) \"video\", "
"clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"MP1S\"")
);
G_DEFINE_TYPE (GstRtpMP1SDepay, gst_rtp_mp1s_depay,
GST_TYPE_RTP_BASE_DEPAYLOAD);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpmp1sdepay, "rtpmp1sdepay",
GST_RANK_SECONDARY, GST_TYPE_RTP_MP1S_DEPAY, rtp_element_init (plugin));
static gboolean gst_rtp_mp1s_depay_setcaps (GstRTPBaseDepayload * depayload,
GstCaps * caps);
static GstBuffer *gst_rtp_mp1s_depay_process (GstRTPBaseDepayload * depayload,
GstRTPBuffer * rtp);
static void
gst_rtp_mp1s_depay_class_init (GstRtpMP1SDepayClass * klass)
{
GstElementClass *gstelement_class;
GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
gstelement_class = (GstElementClass *) klass;
gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mp1s_depay_process;
gstrtpbasedepayload_class->set_caps = gst_rtp_mp1s_depay_setcaps;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_mp1s_depay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_mp1s_depay_sink_template);
gst_element_class_set_static_metadata (gstelement_class,
"RTP MPEG1 System Stream depayloader", "Codec/Depayloader/Network/RTP",
"Extracts MPEG1 System Streams from RTP packets (RFC 3555)",
"Wim Taymans <wim.taymans@gmail.com>");
}
static void
gst_rtp_mp1s_depay_init (GstRtpMP1SDepay * rtpmp1sdepay)
{
}
static gboolean
gst_rtp_mp1s_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/mpeg",
"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_mp1s_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
{
GstBuffer *outbuf;
outbuf = gst_rtp_buffer_get_payload_buffer (rtp);
if (outbuf) {
GST_DEBUG ("gst_rtp_mp1s_depay_chain: pushing buffer of size %"
G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));
gst_rtp_drop_meta (GST_ELEMENT_CAST (depayload), outbuf, 0);
}
return outbuf;
}