/* GStreamer * Copyright (C) <2006> Wim Taymans * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include "gstrtpmpvdepay.h" GST_DEBUG_CATEGORY_STATIC (rtpmpvdepay_debug); #define GST_CAT_DEFAULT (rtpmpvdepay_debug) /* elementfactory information */ static const GstElementDetails gst_rtp_mpvdepay_details = GST_ELEMENT_DETAILS ("RTP packet depayloader", "Codec/Depayloader/Network", "Extracts MPEG video from RTP packets (RFC 2250)", "Wim Taymans "); /* RtpMPVDepay signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; enum { ARG_0, }; static GstStaticPadTemplate gst_rtp_mpv_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/mpeg") ); static GstStaticPadTemplate gst_rtp_mpv_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) 90000, " "encoding-name = (string) \"MPV\";" "application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", " "clock-rate = (int) 90000") ); GST_BOILERPLATE (GstRtpMPVDepay, gst_rtp_mpv_depay, GstBaseRTPDepayload, GST_TYPE_BASE_RTP_DEPAYLOAD); static gboolean gst_rtp_mpv_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps); static GstBuffer *gst_rtp_mpv_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf); static void gst_rtp_mpv_depay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_mpv_depay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static GstStateChangeReturn gst_rtp_mpv_depay_change_state (GstElement * element, GstStateChange transition); static void gst_rtp_mpv_depay_base_init (gpointer klass) { GstElementClass *element_class = GST_ELEMENT_CLASS (klass); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_mpv_depay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_mpv_depay_sink_template)); gst_element_class_set_details (element_class, &gst_rtp_mpvdepay_details); } static void gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; GstBaseRTPDepayloadClass *gstbasertpdepayload_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass; parent_class = g_type_class_peek_parent (klass); gobject_class->set_property = gst_rtp_mpv_depay_set_property; gobject_class->get_property = gst_rtp_mpv_depay_get_property; gstelement_class->change_state = gst_rtp_mpv_depay_change_state; gstbasertpdepayload_class->set_caps = gst_rtp_mpv_depay_setcaps; gstbasertpdepayload_class->process = gst_rtp_mpv_depay_process; GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0, "MPEG Video RTP Depayloader"); } static void gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay, GstRtpMPVDepayClass * klass) { } static gboolean gst_rtp_mpv_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps) { GstStructure *structure; GstRtpMPVDepay *rtpmpvdepay; gint clock_rate = 90000; /* default */ rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload); structure = gst_caps_get_structure (caps, 0); gst_structure_get_int (structure, "clock-rate", &clock_rate); depayload->clock_rate = clock_rate; return TRUE; } static GstBuffer * gst_rtp_mpv_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf) { GstRtpMPVDepay *rtpmpvdepay; GstBuffer *outbuf; rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload); if (!gst_rtp_buffer_validate (buf)) goto bad_packet; { gint payload_len; guint8 *payload; guint8 T; guint32 timestamp; payload_len = gst_rtp_buffer_get_payload_len (buf); payload = gst_rtp_buffer_get_payload (buf); if (payload_len <= 4) goto empty_packet; /* 3.4 MPEG Video-specific header * * 0 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * AN FBV FFV */ T = (payload[0] & 0x04); payload_len -= 4; payload += 4; if (T) { /* * 3.4.1 MPEG-2 Video-specific header extension * * 0 1 2 3 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |X|E|f_[0,0]|f_[0,1]|f_[1,0]|f_[1,1]| DC| PS|T|P|C|Q|V|A|R|H|G|D| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ if (payload_len <= 4) goto empty_packet; payload_len -= 4; payload += 4; } timestamp = gst_rtp_buffer_get_timestamp (buf); outbuf = gst_buffer_new_and_alloc (payload_len); memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len); GST_DEBUG_OBJECT (rtpmpvdepay, "gst_rtp_mpv_depay_chain: pushing buffer of size %d", GST_BUFFER_SIZE (outbuf)); return outbuf; } return NULL; bad_packet: { GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE, ("Packet did not validate."), (NULL)); return NULL; } #if 0 bad_payload: { GST_DEBUG_OBJECT (rtpmpvdepay, "Unexpected payload type %u", pt); return NULL; } #endif empty_packet: { GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE, ("Empty payload."), (NULL)); return NULL; } } static void gst_rtp_mpv_depay_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRtpMPVDepay *rtpmpvdepay; rtpmpvdepay = GST_RTP_MPV_DEPAY (object); switch (prop_id) { default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_mpv_depay_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRtpMPVDepay *rtpmpvdepay; rtpmpvdepay = GST_RTP_MPV_DEPAY (object); switch (prop_id) { default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_rtp_mpv_depay_change_state (GstElement * element, GstStateChange transition) { GstRtpMPVDepay *rtpmpvdepay; GstStateChangeReturn ret; rtpmpvdepay = GST_RTP_MPV_DEPAY (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: 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_mpv_depay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpmpvdepay", GST_RANK_MARGINAL, GST_TYPE_RTP_MPV_DEPAY); }