3 * Copyright (C) <2010> Wim Taymans <wim.taymans@gmail.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
25 #include <gst/rtp/gstrtpbuffer.h>
29 #include "gstrtpg723depay.h"
31 GST_DEBUG_CATEGORY_STATIC (rtpg723depay_debug);
32 #define GST_CAT_DEFAULT (rtpg723depay_debug)
51 /* input is an RTP packet
54 static GstStaticPadTemplate gst_rtp_g723_depay_sink_template =
55 GST_STATIC_PAD_TEMPLATE ("sink",
58 GST_STATIC_CAPS ("application/x-rtp, "
59 "media = (string) \"audio\", "
60 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
61 "clock-rate = (int) 8000, "
62 "encoding-name = (string) \"G723\"; "
64 "media = (string) \"audio\", "
65 "payload = (int) " GST_RTP_PAYLOAD_G723_STRING ", "
66 "clock-rate = (int) 8000")
69 static GstStaticPadTemplate gst_rtp_g723_depay_src_template =
70 GST_STATIC_PAD_TEMPLATE ("src",
73 GST_STATIC_CAPS ("audio/G723, " "channels = (int) 1," "rate = (int) 8000")
76 static gboolean gst_rtp_g723_depay_setcaps (GstRTPBaseDepayload * depayload,
78 static GstBuffer *gst_rtp_g723_depay_process (GstRTPBaseDepayload * depayload,
81 #define gst_rtp_g723_depay_parent_class parent_class
82 G_DEFINE_TYPE (GstRtpG723Depay, gst_rtp_g723_depay,
83 GST_TYPE_RTP_BASE_DEPAYLOAD);
86 gst_rtp_g723_depay_class_init (GstRtpG723DepayClass * klass)
88 GstElementClass *gstelement_class;
89 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
91 GST_DEBUG_CATEGORY_INIT (rtpg723depay_debug, "rtpg723depay", 0,
92 "G.723 RTP Depayloader");
94 gstelement_class = (GstElementClass *) klass;
95 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
97 gst_element_class_add_pad_template (gstelement_class,
98 gst_static_pad_template_get (&gst_rtp_g723_depay_src_template));
99 gst_element_class_add_pad_template (gstelement_class,
100 gst_static_pad_template_get (&gst_rtp_g723_depay_sink_template));
102 gst_element_class_set_static_metadata (gstelement_class,
103 "RTP G.723 depayloader", "Codec/Depayloader/Network/RTP",
104 "Extracts G.723 audio from RTP packets (RFC 3551)",
105 "Wim Taymans <wim.taymans@gmail.com>");
107 gstrtpbasedepayload_class->process = gst_rtp_g723_depay_process;
108 gstrtpbasedepayload_class->set_caps = gst_rtp_g723_depay_setcaps;
112 gst_rtp_g723_depay_init (GstRtpG723Depay * rtpg723depay)
114 GstRTPBaseDepayload *depayload;
116 depayload = GST_RTP_BASE_DEPAYLOAD (rtpg723depay);
118 gst_pad_use_fixed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload));
122 gst_rtp_g723_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
124 GstStructure *structure;
126 GstRtpG723Depay *rtpg723depay;
128 gint clock_rate, channels;
131 rtpg723depay = GST_RTP_G723_DEPAY (depayload);
133 structure = gst_caps_get_structure (caps, 0);
135 if (!(params = gst_structure_get_string (structure, "encoding-params")))
138 channels = atoi (params);
141 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
147 if (clock_rate != 8000)
148 goto wrong_clock_rate;
150 depayload->clock_rate = clock_rate;
152 srccaps = gst_caps_new_simple ("audio/G723",
153 "channels", G_TYPE_INT, channels, "rate", G_TYPE_INT, clock_rate, NULL);
154 ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
155 gst_caps_unref (srccaps);
162 GST_DEBUG_OBJECT (rtpg723depay, "expected 1 channel, got %d", channels);
167 GST_DEBUG_OBJECT (rtpg723depay, "expected 8000 clock-rate, got %d",
175 gst_rtp_g723_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
177 GstRtpG723Depay *rtpg723depay;
178 GstBuffer *outbuf = NULL;
181 GstRTPBuffer rtp = { NULL };
183 rtpg723depay = GST_RTP_G723_DEPAY (depayload);
185 gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp);
187 payload_len = gst_rtp_buffer_get_payload_len (&rtp);
189 /* At least 4 bytes */
193 GST_LOG_OBJECT (rtpg723depay, "payload len %d", payload_len);
195 outbuf = gst_rtp_buffer_get_payload_buffer (&rtp);
196 marker = gst_rtp_buffer_get_marker (&rtp);
197 gst_rtp_buffer_unmap (&rtp);
200 /* marker bit starts talkspurt */
201 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
204 GST_LOG_OBJECT (depayload, "pushing buffer of size %" G_GSIZE_FORMAT,
205 gst_buffer_get_size (outbuf));
212 GST_ELEMENT_WARNING (rtpg723depay, STREAM, DECODE,
213 (NULL), ("G723 RTP payload too small (%d)", payload_len));
219 gst_rtp_buffer_unmap (&rtp);
225 gst_rtp_g723_depay_plugin_init (GstPlugin * plugin)
227 return gst_element_register (plugin, "rtpg723depay",
228 GST_RANK_SECONDARY, GST_TYPE_RTP_G723_DEPAY);