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 G_DEFINE_TYPE (GstRtpMPVDepay, gst_rtp_mpv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
58 static gboolean gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload,
60 static GstBuffer *gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload,
64 gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
66 GstElementClass *gstelement_class;
67 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
69 gstelement_class = (GstElementClass *) klass;
70 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
72 gst_element_class_add_pad_template (gstelement_class,
73 gst_static_pad_template_get (&gst_rtp_mpv_depay_src_template));
74 gst_element_class_add_pad_template (gstelement_class,
75 gst_static_pad_template_get (&gst_rtp_mpv_depay_sink_template));
77 gst_element_class_set_static_metadata (gstelement_class,
78 "RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
79 "Extracts MPEG video from RTP packets (RFC 2250)",
80 "Wim Taymans <wim.taymans@gmail.com>");
82 gstrtpbasedepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
83 gstrtpbasedepayload_class->process = gst_rtp_mpv_depay_process;
85 GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
86 "MPEG Video RTP Depayloader");
90 gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay)
95 gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
97 GstStructure *structure;
102 structure = gst_caps_get_structure (caps, 0);
104 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
105 clock_rate = 90000; /* default */
106 depayload->clock_rate = clock_rate;
108 outcaps = gst_caps_new_simple ("video/mpeg",
109 "mpegversion", G_TYPE_INT, 2,
110 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
111 res = gst_pad_set_caps (depayload->srcpad, outcaps);
112 gst_caps_unref (outcaps);
118 gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
120 GstRtpMPVDepay *rtpmpvdepay;
122 GstRTPBuffer rtp = { NULL };
124 rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
126 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
129 gint payload_len, payload_header;
133 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
134 payload = gst_rtp_buffer_get_payload (&rtp);
137 if (payload_len <= 4)
140 /* 3.4 MPEG Video-specific header
143 * 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
144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
145 * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
146 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
149 T = (payload[0] & 0x04);
157 * 3.4.1 MPEG-2 Video-specific header extension
160 * 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
161 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
162 * |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|
163 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
165 if (payload_len <= 4)
173 outbuf = gst_rtp_buffer_get_payload_subbuffer (&rtp, payload_header, -1);
176 GST_DEBUG_OBJECT (rtpmpvdepay,
177 "gst_rtp_mpv_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT,
178 gst_buffer_get_size (outbuf));
188 GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
189 (NULL), ("Empty payload."));
195 gst_rtp_mpv_depay_plugin_init (GstPlugin * plugin)
197 return gst_element_register (plugin, "rtpmpvdepay",
198 GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY);