/* 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include <string.h> #include <gst/rtp/gstrtpbuffer.h> #include "gstrtpsv3vdepay.h" /* elementfactory information */ static const GstElementDetails gst_rtp_sv3vdepay_details = GST_ELEMENT_DETAILS ("RTP SVQ3 depayloader", "Codec/Depayloader/Network", "Extracts SVQ3 video from RTP packets (no RFC)", "Wim Taymans <wim.taymans@gmail.com>"); static GstStaticPadTemplate gst_rtp_sv3v_depay_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("video/x-svq, " "svqversion = (int) 3") ); static GstStaticPadTemplate gst_rtp_sv3v_depay_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp, " "media = (string) \"video\", " "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", " "clock-rate = (int) 90000, " "encoding-name = (string) { \"X-SV3V-ES\", \"X-SORENSON-VIDEO\" }") ); GST_BOILERPLATE (GstRtpSV3VDepay, gst_rtp_sv3v_depay, GstBaseRTPDepayload, GST_TYPE_BASE_RTP_DEPAYLOAD); static void gst_rtp_sv3v_depay_finalize (GObject * object); static GstStateChangeReturn gst_rtp_sv3v_depay_change_state (GstElement * element, GstStateChange transition); static GstBuffer *gst_rtp_sv3v_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf); gboolean gst_rtp_sv3v_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps); static void gst_rtp_sv3v_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_sv3v_depay_src_template)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&gst_rtp_sv3v_depay_sink_template)); gst_element_class_set_details (element_class, &gst_rtp_sv3vdepay_details); } static void gst_rtp_sv3v_depay_class_init (GstRtpSV3VDepayClass * 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); gstbasertpdepayload_class->process = gst_rtp_sv3v_depay_process; gstbasertpdepayload_class->set_caps = gst_rtp_sv3v_depay_setcaps; gobject_class->finalize = gst_rtp_sv3v_depay_finalize; gstelement_class->change_state = gst_rtp_sv3v_depay_change_state; } static void gst_rtp_sv3v_depay_init (GstRtpSV3VDepay * rtpsv3vdepay, GstRtpSV3VDepayClass * klass) { rtpsv3vdepay->adapter = gst_adapter_new (); } static void gst_rtp_sv3v_depay_finalize (GObject * object) { GstRtpSV3VDepay *rtpsv3vdepay; rtpsv3vdepay = GST_RTP_SV3V_DEPAY (object); g_object_unref (rtpsv3vdepay->adapter); rtpsv3vdepay->adapter = NULL; G_OBJECT_CLASS (parent_class)->finalize (object); } // only on the sink gboolean gst_rtp_sv3v_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps) { GstStructure *structure = gst_caps_get_structure (caps, 0); gint clock_rate; if (!gst_structure_get_int (structure, "clock-rate", &clock_rate)) clock_rate = 90000; // default filter->clock_rate = clock_rate; /* will set caps later */ return TRUE; } static GstBuffer * gst_rtp_sv3v_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf) { GstRtpSV3VDepay *rtpsv3vdepay; GstBuffer *outbuf; guint16 seq; rtpsv3vdepay = GST_RTP_SV3V_DEPAY (depayload); /* flush on sequence number gaps */ seq = gst_rtp_buffer_get_seq (buf); if (seq != rtpsv3vdepay->nextseq) { gst_adapter_clear (rtpsv3vdepay->adapter); } rtpsv3vdepay->nextseq = seq + 1; { gint payload_len; guint8 *payload; gboolean M; gboolean C, S, E; payload_len = gst_rtp_buffer_get_payload_len (buf); if (payload_len < 3) goto bad_packet; payload = gst_rtp_buffer_get_payload (buf); M = gst_rtp_buffer_get_marker (buf); /* This is all a guess: * 1 1 1 1 1 1 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * |0|C|S|E|0|0|0|0|0|0|0|0|0|0|0|0| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * C: config, packet contains config info * S: start, packet contains start of frame * E: end, packet contains end of frame */ /* this seems to indicate a packet with a config string sent before each * keyframe */ C = (payload[0] & 0x40) == 0x40; /* redundant with the RTP marker bit */ S = (payload[0] & 0x20) == 0x20; E = (payload[0] & 0x10) == 0x10; if (C) { GstCaps *caps; GstBuffer *codec_data; GValue value = { 0 }; /* if we already have caps, we don't need to do anything. FIXME, check if * something changed. */ if (GST_PAD_CAPS (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload))) return NULL; /* No idea... These are the two examples I found.. */ if (payload[2] == 0x1d) { rtpsv3vdepay->width = 160; rtpsv3vdepay->height = 128; } else if (payload[2] == 0xdd) { rtpsv3vdepay->width = 320; rtpsv3vdepay->height = 240; } /* we need a dummy empty codec data */ g_value_init (&value, GST_TYPE_BUFFER); gst_value_deserialize (&value, ""); codec_data = gst_value_get_buffer (&value); caps = gst_caps_new_simple ("video/x-svq", "svqversion", G_TYPE_INT, 3, "width", G_TYPE_INT, rtpsv3vdepay->width, "height", G_TYPE_INT, rtpsv3vdepay->height, "codec_data", GST_TYPE_BUFFER, codec_data, NULL); gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (depayload), caps); gst_caps_unref (caps); g_value_unset (&value); return NULL; } /* store data in adapter, stip off 2 bytes header */ outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1); gst_adapter_push (rtpsv3vdepay->adapter, outbuf); if (M) { /* frame is completed: push contents of adapter */ guint avail; avail = gst_adapter_available (rtpsv3vdepay->adapter); outbuf = gst_adapter_take_buffer (rtpsv3vdepay->adapter, avail); return outbuf; } } return NULL; /* ERRORS */ bad_packet: { GST_ELEMENT_WARNING (rtpsv3vdepay, STREAM, DECODE, (NULL), ("Packet was too short")); return NULL; } } static GstStateChangeReturn gst_rtp_sv3v_depay_change_state (GstElement * element, GstStateChange transition) { GstRtpSV3VDepay *rtpsv3vdepay; GstStateChangeReturn ret; rtpsv3vdepay = GST_RTP_SV3V_DEPAY (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_adapter_clear (rtpsv3vdepay->adapter); 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_sv3v_depay_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "rtpsv3vdepay", GST_RANK_NONE, GST_TYPE_RTP_SV3V_DEPAY); }