/* 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\";" /* 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, GstBuffer * buf); 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 = 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, GstBuffer * buf) { GstRtpMP2TDepay *rtpmp2tdepay; GstBuffer *outbuf; gint payload_len, leftover; GstRTPBuffer rtp = { NULL }; rtpmp2tdepay = GST_RTP_MP2T_DEPAY (depayload); gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp); 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); gst_rtp_buffer_unmap (&rtp); 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")); gst_rtp_buffer_unmap (&rtp); 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); }