2 * Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
24 #include <gst/rtp/gstrtpbuffer.h>
27 #include "gstrtpmpvdepay.h"
29 GST_DEBUG_CATEGORY_STATIC (rtpmpvdepay_debug);
30 #define GST_CAT_DEFAULT (rtpmpvdepay_debug)
32 /* FIXME, we set the mpeg version to 2, we should ideally be looking at contents
33 * of the stream to figure out the version */
34 static GstStaticPadTemplate gst_rtp_mpv_depay_src_template =
35 GST_STATIC_PAD_TEMPLATE ("src",
39 ("video/mpeg, mpegversion = (int) 2, systemstream = (boolean) FALSE")
42 static GstStaticPadTemplate gst_rtp_mpv_depay_sink_template =
43 GST_STATIC_PAD_TEMPLATE ("sink",
46 GST_STATIC_CAPS ("application/x-rtp, "
47 "media = (string) \"video\", "
48 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
49 "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\";"
51 "media = (string) \"video\", "
52 "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
53 "clock-rate = (int) 90000")
56 GST_BOILERPLATE (GstRtpMPVDepay, gst_rtp_mpv_depay, GstBaseRTPDepayload,
57 GST_TYPE_BASE_RTP_DEPAYLOAD);
59 static gboolean gst_rtp_mpv_depay_setcaps (GstBaseRTPDepayload * depayload,
61 static GstBuffer *gst_rtp_mpv_depay_process (GstBaseRTPDepayload * depayload,
65 gst_rtp_mpv_depay_base_init (gpointer klass)
67 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
69 gst_element_class_add_static_pad_template (element_class,
70 &gst_rtp_mpv_depay_src_template);
71 gst_element_class_add_static_pad_template (element_class,
72 &gst_rtp_mpv_depay_sink_template);
74 gst_element_class_set_details_simple (element_class,
75 "RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
76 "Extracts MPEG video from RTP packets (RFC 2250)",
77 "Wim Taymans <wim.taymans@gmail.com>");
81 gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
83 GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
85 gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
87 gstbasertpdepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
88 gstbasertpdepayload_class->process = gst_rtp_mpv_depay_process;
90 GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
91 "MPEG Video RTP Depayloader");
95 gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay,
96 GstRtpMPVDepayClass * klass)
98 /* needed because of GST_BOILERPLATE */
102 gst_rtp_mpv_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
104 GstStructure *structure;
109 structure = gst_caps_get_structure (caps, 0);
111 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
112 clock_rate = 90000; /* default */
113 depayload->clock_rate = clock_rate;
115 outcaps = gst_caps_new_simple ("video/mpeg",
116 "mpegversion", G_TYPE_INT, 2,
117 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
118 res = gst_pad_set_caps (depayload->srcpad, outcaps);
119 gst_caps_unref (outcaps);
125 gst_rtp_mpv_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
127 GstRtpMPVDepay *rtpmpvdepay;
130 rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
133 gint payload_len, payload_header;
137 payload_len = gst_rtp_buffer_get_payload_len (buf);
138 payload = gst_rtp_buffer_get_payload (buf);
141 if (payload_len <= 4)
144 /* 3.4 MPEG Video-specific header
147 * 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
148 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
149 * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
150 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
153 T = (payload[0] & 0x04);
161 * 3.4.1 MPEG-2 Video-specific header extension
164 * 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
165 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
166 * |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|
167 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
169 if (payload_len <= 4)
177 outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, payload_header, -1);
180 GST_DEBUG_OBJECT (rtpmpvdepay,
181 "gst_rtp_mpv_depay_chain: pushing buffer of size %d",
182 GST_BUFFER_SIZE (outbuf));
193 GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
194 (NULL), ("Empty payload."));
200 gst_rtp_mpv_depay_plugin_init (GstPlugin * plugin)
202 return gst_element_register (plugin, "rtpmpvdepay",
203 GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY);