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239 lines
6.9 KiB
C
239 lines
6.9 KiB
C
/* GStreamer
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* Copyright (C) <2005> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/rtp/gstrtpbuffer.h>
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#include <string.h>
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#include "gstrtpelements.h"
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#include "gstrtpmp2tdepay.h"
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#include "gstrtputils.h"
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/* RtpMP2TDepay signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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#define DEFAULT_SKIP_FIRST_BYTES 0
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enum
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{
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PROP_0,
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PROP_SKIP_FIRST_BYTES
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};
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static GstStaticPadTemplate gst_rtp_mp2t_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/mpegts,"
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"packetsize=(int)188," "systemstream=(boolean)true")
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);
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static GstStaticPadTemplate gst_rtp_mp2t_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"video\", "
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"clock-rate = (int) [1, MAX ], "
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"encoding-name = (string) { MP2T, MP2T-ES } ;"
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/* All optional parameters
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*
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* "profile-level-id=[1,MAX]"
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* "config="
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*/
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"application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_MP2T_STRING ", "
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"clock-rate = (int) [1, MAX ]")
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);
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G_DEFINE_TYPE (GstRtpMP2TDepay, gst_rtp_mp2t_depay,
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GST_TYPE_RTP_BASE_DEPAYLOAD);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpmp2tdepay, "rtpmp2tdepay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_MP2T_DEPAY, rtp_element_init (plugin));
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static gboolean gst_rtp_mp2t_depay_setcaps (GstRTPBaseDepayload * depayload,
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GstCaps * caps);
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static GstBuffer *gst_rtp_mp2t_depay_process (GstRTPBaseDepayload * depayload,
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GstRTPBuffer * rtp);
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static void gst_rtp_mp2t_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_mp2t_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void
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gst_rtp_mp2t_depay_class_init (GstRtpMP2TDepayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mp2t_depay_process;
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gstrtpbasedepayload_class->set_caps = gst_rtp_mp2t_depay_setcaps;
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gobject_class->set_property = gst_rtp_mp2t_depay_set_property;
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gobject_class->get_property = gst_rtp_mp2t_depay_get_property;
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_mp2t_depay_src_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_mp2t_depay_sink_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP MPEG Transport Stream depayloader", "Codec/Depayloader/Network/RTP",
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"Extracts MPEG2 TS from RTP packets (RFC 2250)",
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"Wim Taymans <wim.taymans@gmail.com>, "
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"Thijs Vermeir <thijs.vermeir@barco.com>");
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g_object_class_install_property (gobject_class, PROP_SKIP_FIRST_BYTES,
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g_param_spec_uint ("skip-first-bytes",
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"Skip first bytes",
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"The amount of bytes that need to be skipped at the beginning of the payload",
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0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_rtp_mp2t_depay_init (GstRtpMP2TDepay * rtpmp2tdepay)
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{
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rtpmp2tdepay->skip_first_bytes = DEFAULT_SKIP_FIRST_BYTES;
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}
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static gboolean
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gst_rtp_mp2t_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
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{
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GstCaps *srccaps;
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GstStructure *structure;
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gint clock_rate;
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gboolean res;
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000; /* default */
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depayload->clock_rate = clock_rate;
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srccaps = gst_caps_new_simple ("video/mpegts",
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"packetsize", G_TYPE_INT, 188,
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"systemstream", G_TYPE_BOOLEAN, TRUE, NULL);
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res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
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gst_caps_unref (srccaps);
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return res;
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}
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static GstBuffer *
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gst_rtp_mp2t_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
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{
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GstRtpMP2TDepay *rtpmp2tdepay;
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GstBuffer *outbuf;
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gint payload_len, leftover;
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rtpmp2tdepay = GST_RTP_MP2T_DEPAY (depayload);
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payload_len = gst_rtp_buffer_get_payload_len (rtp);
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if (G_UNLIKELY (payload_len <= rtpmp2tdepay->skip_first_bytes))
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goto empty_packet;
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payload_len -= rtpmp2tdepay->skip_first_bytes;
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/* RFC 2250
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*
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* 2. Encapsulation of MPEG System and Transport Streams
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*
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* For MPEG2 Transport Streams the RTP payload will contain an integral
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* number of MPEG transport packets.
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*/
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leftover = payload_len % 188;
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if (G_UNLIKELY (leftover)) {
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GST_WARNING ("We don't have an integral number of buffers (leftover: %d)",
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leftover);
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payload_len -= leftover;
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}
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outbuf =
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gst_rtp_buffer_get_payload_subbuffer (rtp,
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rtpmp2tdepay->skip_first_bytes, payload_len);
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if (outbuf) {
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GST_DEBUG ("gst_rtp_mp2t_depay_chain: pushing buffer of size %"
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G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));
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gst_rtp_drop_meta (GST_ELEMENT_CAST (depayload), outbuf, 0);
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}
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return outbuf;
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/* ERRORS */
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empty_packet:
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{
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GST_ELEMENT_WARNING (rtpmp2tdepay, STREAM, DECODE,
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(NULL), ("Packet was empty"));
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return NULL;
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}
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}
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static void
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gst_rtp_mp2t_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpMP2TDepay *rtpmp2tdepay;
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rtpmp2tdepay = GST_RTP_MP2T_DEPAY (object);
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switch (prop_id) {
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case PROP_SKIP_FIRST_BYTES:
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rtpmp2tdepay->skip_first_bytes = g_value_get_uint (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_mp2t_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstRtpMP2TDepay *rtpmp2tdepay;
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rtpmp2tdepay = GST_RTP_MP2T_DEPAY (object);
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switch (prop_id) {
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case PROP_SKIP_FIRST_BYTES:
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g_value_set_uint (value, rtpmp2tdepay->skip_first_bytes);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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