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., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, 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 "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\";"
50 "media = (string) \"video\", "
51 "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
52 "clock-rate = (int) 90000")
55 G_DEFINE_TYPE (GstRtpMPVDepay, gst_rtp_mpv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
57 static gboolean gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload,
59 static GstBuffer *gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload,
63 gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
65 GstElementClass *gstelement_class;
66 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
68 gstelement_class = (GstElementClass *) klass;
69 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
71 gst_element_class_add_pad_template (gstelement_class,
72 gst_static_pad_template_get (&gst_rtp_mpv_depay_src_template));
73 gst_element_class_add_pad_template (gstelement_class,
74 gst_static_pad_template_get (&gst_rtp_mpv_depay_sink_template));
76 gst_element_class_set_static_metadata (gstelement_class,
77 "RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
78 "Extracts MPEG video from RTP packets (RFC 2250)",
79 "Wim Taymans <wim.taymans@gmail.com>");
81 gstrtpbasedepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
82 gstrtpbasedepayload_class->process = gst_rtp_mpv_depay_process;
84 GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
85 "MPEG Video RTP Depayloader");
89 gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay)
94 gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
96 GstStructure *structure;
101 structure = gst_caps_get_structure (caps, 0);
103 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
104 clock_rate = 90000; /* default */
105 depayload->clock_rate = clock_rate;
107 outcaps = gst_caps_new_simple ("video/mpeg",
108 "mpegversion", G_TYPE_INT, 2,
109 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
110 res = gst_pad_set_caps (depayload->srcpad, outcaps);
111 gst_caps_unref (outcaps);
117 gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
119 GstRtpMPVDepay *rtpmpvdepay;
121 GstRTPBuffer rtp = { NULL };
123 rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
125 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
128 gint payload_len, payload_header;
132 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
133 payload = gst_rtp_buffer_get_payload (&rtp);
136 if (payload_len <= 4)
139 /* 3.4 MPEG Video-specific header
142 * 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
143 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
144 * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
145 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
148 T = (payload[0] & 0x04);
156 * 3.4.1 MPEG-2 Video-specific header extension
159 * 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
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * |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|
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
164 if (payload_len <= 4)
172 outbuf = gst_rtp_buffer_get_payload_subbuffer (&rtp, payload_header, -1);
175 GST_DEBUG_OBJECT (rtpmpvdepay,
176 "gst_rtp_mpv_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT,
177 gst_buffer_get_size (outbuf));
187 GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
188 (NULL), ("Empty payload."));
194 gst_rtp_mpv_depay_plugin_init (GstPlugin * plugin)
196 return gst_element_register (plugin, "rtpmpvdepay",
197 GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY);