2 * Copyright (C) <2007> 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 "gstrtpac3depay.h"
29 GST_DEBUG_CATEGORY_STATIC (rtpac3depay_debug);
30 #define GST_CAT_DEFAULT (rtpac3depay_debug)
32 /* elementfactory information */
33 static const GstElementDetails gst_rtp_ac3depay_details =
34 GST_ELEMENT_DETAILS ("RTP AC3 depayloader",
35 "Codec/Depayloader/Network",
36 "Extracts AC3 audio from RTP packets (RFC 4184)",
37 "Wim Taymans <wim.taymans@gmail.com>");
39 static GstStaticPadTemplate gst_rtp_ac3_depay_src_template =
40 GST_STATIC_PAD_TEMPLATE ("src",
43 GST_STATIC_CAPS ("audio/ac3")
46 static GstStaticPadTemplate gst_rtp_ac3_depay_sink_template =
47 GST_STATIC_PAD_TEMPLATE ("sink",
50 GST_STATIC_CAPS ("application/x-rtp, "
51 "media = (string) \"audio\", "
52 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
53 "clock-rate = (int) { 32000, 44100, 48000 }, "
54 "encoding-name = (string) \"AC3\"")
57 GST_BOILERPLATE (GstRtpAC3Depay, gst_rtp_ac3_depay, GstBaseRTPDepayload,
58 GST_TYPE_BASE_RTP_DEPAYLOAD);
60 static gboolean gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload,
62 static GstBuffer *gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload,
65 static GstStateChangeReturn gst_rtp_ac3_depay_change_state (GstElement *
66 element, GstStateChange transition);
69 gst_rtp_ac3_depay_base_init (gpointer klass)
71 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
73 gst_element_class_add_pad_template (element_class,
74 gst_static_pad_template_get (&gst_rtp_ac3_depay_src_template));
75 gst_element_class_add_pad_template (element_class,
76 gst_static_pad_template_get (&gst_rtp_ac3_depay_sink_template));
78 gst_element_class_set_details (element_class, &gst_rtp_ac3depay_details);
82 gst_rtp_ac3_depay_class_init (GstRtpAC3DepayClass * klass)
84 GstElementClass *gstelement_class;
85 GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
87 gstelement_class = (GstElementClass *) klass;
88 gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
90 parent_class = g_type_class_peek_parent (klass);
92 gstelement_class->change_state = gst_rtp_ac3_depay_change_state;
94 gstbasertpdepayload_class->set_caps = gst_rtp_ac3_depay_setcaps;
95 gstbasertpdepayload_class->process = gst_rtp_ac3_depay_process;
97 GST_DEBUG_CATEGORY_INIT (rtpac3depay_debug, "rtpac3depay", 0,
98 "MPEG Audio RTP Depayloader");
102 gst_rtp_ac3_depay_init (GstRtpAC3Depay * rtpac3depay,
103 GstRtpAC3DepayClass * klass)
105 /* needed because of GST_BOILERPLATE */
109 gst_rtp_ac3_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
111 GstStructure *structure;
112 GstRtpAC3Depay *rtpac3depay;
117 rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
119 structure = gst_caps_get_structure (caps, 0);
121 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
122 clock_rate = 90000; /* default */
123 depayload->clock_rate = clock_rate;
125 srccaps = gst_caps_new_simple ("audio/ac3", NULL);
126 res = gst_pad_set_caps (depayload->srcpad, srccaps);
127 gst_caps_unref (srccaps);
138 static const struct frmsize_s frmsizecod_tbl[] = {
143 {48, {96, 104, 144}},
144 {48, {96, 105, 144}},
145 {56, {112, 121, 168}},
146 {56, {112, 122, 168}},
147 {64, {128, 139, 192}},
148 {64, {128, 140, 192}},
149 {80, {160, 174, 240}},
150 {80, {160, 175, 240}},
151 {96, {192, 208, 288}},
152 {96, {192, 209, 288}},
153 {112, {224, 243, 336}},
154 {112, {224, 244, 336}},
155 {128, {256, 278, 384}},
156 {128, {256, 279, 384}},
157 {160, {320, 348, 480}},
158 {160, {320, 349, 480}},
159 {192, {384, 417, 576}},
160 {192, {384, 418, 576}},
161 {224, {448, 487, 672}},
162 {224, {448, 488, 672}},
163 {256, {512, 557, 768}},
164 {256, {512, 558, 768}},
165 {320, {640, 696, 960}},
166 {320, {640, 697, 960}},
167 {384, {768, 835, 1152}},
168 {384, {768, 836, 1152}},
169 {448, {896, 975, 1344}},
170 {448, {896, 976, 1344}},
171 {512, {1024, 1114, 1536}},
172 {512, {1024, 1115, 1536}},
173 {576, {1152, 1253, 1728}},
174 {576, {1152, 1254, 1728}},
175 {640, {1280, 1393, 1920}},
176 {640, {1280, 1394, 1920}}
180 gst_rtp_ac3_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
182 GstRtpAC3Depay *rtpac3depay;
185 rtpac3depay = GST_RTP_AC3_DEPAY (depayload);
192 payload_len = gst_rtp_buffer_get_payload_len (buf);
193 payload = gst_rtp_buffer_get_payload (buf);
195 if (payload_len <= 2)
201 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
202 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
204 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
206 FT = payload[0] & 0x3;
209 GST_DEBUG_OBJECT (rtpac3depay, "FT: %d, NF: %d", FT, NF);
214 /* We don't bother with fragmented packets yet */
215 outbuf = gst_rtp_buffer_get_payload_subbuffer (buf, 2, -1);
217 GST_DEBUG_OBJECT (rtpac3depay, "pushing buffer of size %d",
218 GST_BUFFER_SIZE (outbuf));
228 GST_ELEMENT_WARNING (rtpac3depay, STREAM, DECODE,
229 ("Empty Payload."), (NULL));
234 static GstStateChangeReturn
235 gst_rtp_ac3_depay_change_state (GstElement * element, GstStateChange transition)
237 GstRtpAC3Depay *rtpac3depay;
238 GstStateChangeReturn ret;
240 rtpac3depay = GST_RTP_AC3_DEPAY (element);
243 switch (transition) {
244 case GST_STATE_CHANGE_NULL_TO_READY:
251 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
254 switch (transition) {
255 case GST_STATE_CHANGE_READY_TO_NULL:
265 gst_rtp_ac3_depay_plugin_init (GstPlugin * plugin)
267 return gst_element_register (plugin, "rtpac3depay",
268 GST_RANK_MARGINAL, GST_TYPE_RTP_AC3_DEPAY);