2 * Copyright (C) <2005> Wim Taymans <wim@fluendo.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
19 #include <gst/rtp/gstrtpbuffer.h>
22 #include "gstrtpamrdec.h"
26 * RFC 3267 - Real-Time Transport Protocol (RTP) Payload Format and File Storage Format
27 * for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB) Audio
31 /* elementfactory information */
32 static GstElementDetails gst_rtp_amrdec_details = {
34 "Codec/Parser/Network",
35 "Extracts MPEG audio from RTP packets",
36 "Wim Taymans <wim@fluendo.com>"
39 /* RtpAMRDec signals and args */
52 /* input is an RTP packet
54 * params see RFC 3267, section 8.1
56 static GstStaticPadTemplate gst_rtpamrdec_sink_template =
57 GST_STATIC_PAD_TEMPLATE ("sink",
60 GST_STATIC_CAPS ("application/x-rtp, "
61 "octet-align = (boolean) TRUE, "
62 "crc = (boolean) FALSE, "
63 "robust-sorting = (boolean) FALSE, "
64 "interleaving = (boolean) FALSE, "
65 "channels = (int) 1, " "rate = (int) 8000"
66 /* following options are not needed for a decoder
68 "mode-set = (int) [ 0, 7 ], "
69 "mode-change-period = (int) [ 1, MAX ], "
70 "mode-change-neighbor = (boolean) { TRUE, FALSE }, "
71 "maxptime = (int) [ 20, MAX ], "
72 "ptime = (int) [ 20, MAX ]"
77 static GstStaticPadTemplate gst_rtpamrdec_src_template =
78 GST_STATIC_PAD_TEMPLATE ("src",
81 GST_STATIC_CAPS ("audio/AMR, " "channels = (int) 1," "rate = (int) 8000")
84 static void gst_rtpamrdec_class_init (GstRtpAMRDecClass * klass);
85 static void gst_rtpamrdec_base_init (GstRtpAMRDecClass * klass);
86 static void gst_rtpamrdec_init (GstRtpAMRDec * rtpamrdec);
88 static gboolean gst_rtpamrdec_sink_setcaps (GstPad * pad, GstCaps * caps);
89 static GstFlowReturn gst_rtpamrdec_chain (GstPad * pad, GstBuffer * buffer);
91 static void gst_rtpamrdec_set_property (GObject * object, guint prop_id,
92 const GValue * value, GParamSpec * pspec);
93 static void gst_rtpamrdec_get_property (GObject * object, guint prop_id,
94 GValue * value, GParamSpec * pspec);
96 static GstElementStateReturn gst_rtpamrdec_change_state (GstElement * element);
98 static GstElementClass *parent_class = NULL;
101 gst_rtpamrdec_get_type (void)
103 static GType rtpamrdec_type = 0;
105 if (!rtpamrdec_type) {
106 static const GTypeInfo rtpamrdec_info = {
107 sizeof (GstRtpAMRDecClass),
108 (GBaseInitFunc) gst_rtpamrdec_base_init,
110 (GClassInitFunc) gst_rtpamrdec_class_init,
113 sizeof (GstRtpAMRDec),
115 (GInstanceInitFunc) gst_rtpamrdec_init,
119 g_type_register_static (GST_TYPE_ELEMENT, "GstRtpAMRDec",
122 return rtpamrdec_type;
126 gst_rtpamrdec_base_init (GstRtpAMRDecClass * klass)
128 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
130 gst_element_class_add_pad_template (element_class,
131 gst_static_pad_template_get (&gst_rtpamrdec_src_template));
132 gst_element_class_add_pad_template (element_class,
133 gst_static_pad_template_get (&gst_rtpamrdec_sink_template));
135 gst_element_class_set_details (element_class, &gst_rtp_amrdec_details);
139 gst_rtpamrdec_class_init (GstRtpAMRDecClass * klass)
141 GObjectClass *gobject_class;
142 GstElementClass *gstelement_class;
144 gobject_class = (GObjectClass *) klass;
145 gstelement_class = (GstElementClass *) klass;
147 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
149 gobject_class->set_property = gst_rtpamrdec_set_property;
150 gobject_class->get_property = gst_rtpamrdec_get_property;
152 gstelement_class->change_state = gst_rtpamrdec_change_state;
156 gst_rtpamrdec_init (GstRtpAMRDec * rtpamrdec)
161 gst_pad_new_from_template (gst_static_pad_template_get
162 (&gst_rtpamrdec_src_template), "src");
165 srccaps = gst_caps_new_simple ("audio/AMR",
166 "channels", G_TYPE_INT, 1, "rate", G_TYPE_INT, 8000, NULL);
167 gst_pad_set_caps (rtpamrdec->srcpad, srccaps);
168 gst_caps_unref (srccaps);
170 gst_element_add_pad (GST_ELEMENT (rtpamrdec), rtpamrdec->srcpad);
173 gst_pad_new_from_template (gst_static_pad_template_get
174 (&gst_rtpamrdec_sink_template), "sink");
175 gst_pad_set_setcaps_function (rtpamrdec->sinkpad, gst_rtpamrdec_sink_setcaps);
176 gst_pad_set_chain_function (rtpamrdec->sinkpad, gst_rtpamrdec_chain);
177 gst_element_add_pad (GST_ELEMENT (rtpamrdec), rtpamrdec->sinkpad);
181 gst_rtpamrdec_sink_setcaps (GstPad * pad, GstCaps * caps)
183 GstStructure *structure;
185 GstRtpAMRDec *rtpamrdec;
187 rtpamrdec = GST_RTP_AMR_DEC (GST_OBJECT_PARENT (pad));
189 structure = gst_caps_get_structure (caps, 0);
191 if (!gst_structure_get_boolean (structure, "octet-align",
192 &rtpamrdec->octet_align))
193 rtpamrdec->octet_align = FALSE;
195 /* FIXME, force octect align for now until all elements negotiate
197 rtpamrdec->octet_align = TRUE;
199 if (!gst_structure_get_boolean (structure, "crc", &rtpamrdec->crc))
200 rtpamrdec->crc = FALSE;
202 if (rtpamrdec->crc) {
203 /* crc mode implies octet aligned mode */
204 rtpamrdec->octet_align = TRUE;
207 if (!gst_structure_get_boolean (structure, "robust-sorting",
208 &rtpamrdec->robust_sorting))
209 rtpamrdec->robust_sorting = FALSE;
211 if (rtpamrdec->robust_sorting) {
212 /* robust_sorting mode implies octet aligned mode */
213 rtpamrdec->octet_align = TRUE;
216 if (!gst_structure_get_boolean (structure, "interleaving",
217 &rtpamrdec->interleaving))
218 rtpamrdec->interleaving = FALSE;
220 if (rtpamrdec->interleaving) {
221 /* interleaving mode implies octet aligned mode */
222 rtpamrdec->octet_align = TRUE;
225 if (!gst_structure_get_int (structure, "channels", &rtpamrdec->channels))
226 rtpamrdec->channels = 1;
227 if (!gst_structure_get_int (structure, "rate", &rtpamrdec->rate))
228 rtpamrdec->rate = 8000;
230 /* we require 1 channel, 8000 Hz, octet aligned, no CRC,
231 * no robust sorting, no interleaving for now */
232 if (rtpamrdec->channels != 1)
234 if (rtpamrdec->rate != 8000)
236 if (rtpamrdec->octet_align != TRUE)
238 if (rtpamrdec->crc != FALSE)
240 if (rtpamrdec->robust_sorting != FALSE)
242 if (rtpamrdec->interleaving != FALSE)
245 srccaps = gst_caps_new_simple ("audio/AMR",
246 "channels", G_TYPE_INT, rtpamrdec->channels,
247 "rate", G_TYPE_INT, rtpamrdec->rate, NULL);
248 gst_pad_set_caps (rtpamrdec->srcpad, srccaps);
249 gst_caps_unref (srccaps);
251 rtpamrdec->negotiated = TRUE;
257 gst_rtpamrdec_chain (GstPad * pad, GstBuffer * buf)
259 GstRtpAMRDec *rtpamrdec;
263 rtpamrdec = GST_RTP_AMR_DEC (GST_OBJECT_PARENT (pad));
265 if (!rtpamrdec->negotiated)
268 if (!gst_rtpbuffer_validate (buf))
271 /* when we get here, 1 channel, 8000 Hz, octet aligned, no CRC,
272 * no robust sorting, no interleaving data is to be parsed */
277 guint8 CMR, F, FT, Q;
279 payload_len = gst_rtpbuffer_get_payload_len (buf);
281 /* need at least 2 bytes for the header */
285 payload = gst_rtpbuffer_get_payload (buf);
288 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
289 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+..
290 * | CMR=6 |R|R|R|R|0|FT#1=5 |Q|P|P|
291 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+..
293 CMR = (payload[0] & 0xf0) >> 4;
294 F = (payload[1] & 0x80) >> 7;
295 /* we only support 1 packet per RTP packet for now */
297 goto one_packet_only;
299 FT = (payload[1] & 0x78) >> 3;
300 Q = (payload[1] & 0x04) >> 2;
303 if (FT > 9 && FT < 15) {
308 /* strip header now, leave FT in the data for the decoder */
312 timestamp = gst_rtpbuffer_get_timestamp (buf);
314 outbuf = gst_buffer_new_and_alloc (payload_len);
316 GST_BUFFER_TIMESTAMP (outbuf) = timestamp * GST_SECOND / 8000;
318 memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
320 gst_buffer_set_caps (outbuf, GST_PAD_CAPS (rtpamrdec->srcpad));
322 GST_DEBUG ("gst_rtpamrdec_chain: pushing buffer of size %d",
323 GST_BUFFER_SIZE (outbuf));
324 ret = gst_pad_push (rtpamrdec->srcpad, outbuf);
327 gst_buffer_unref (buf);
334 GST_DEBUG ("not_negotiated");
335 gst_buffer_unref (buf);
336 return GST_FLOW_NOT_NEGOTIATED;
340 GST_DEBUG ("Packet did not validate");
341 gst_buffer_unref (buf);
342 return GST_FLOW_ERROR;
346 GST_DEBUG ("One packet per RTP packet only");
347 gst_buffer_unref (buf);
348 return GST_FLOW_ERROR;
353 gst_rtpamrdec_set_property (GObject * object, guint prop_id,
354 const GValue * value, GParamSpec * pspec)
356 GstRtpAMRDec *rtpamrdec;
358 rtpamrdec = GST_RTP_AMR_DEC (object);
362 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
368 gst_rtpamrdec_get_property (GObject * object, guint prop_id, GValue * value,
371 GstRtpAMRDec *rtpamrdec;
373 rtpamrdec = GST_RTP_AMR_DEC (object);
377 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
382 static GstElementStateReturn
383 gst_rtpamrdec_change_state (GstElement * element)
385 GstRtpAMRDec *rtpamrdec;
387 GstElementStateReturn ret;
389 rtpamrdec = GST_RTP_AMR_DEC (element);
390 transition = GST_STATE_TRANSITION (element);
392 switch (transition) {
393 case GST_STATE_NULL_TO_READY:
395 case GST_STATE_READY_TO_PAUSED:
396 /* FIXME, don't require negotiation until all elements
398 rtpamrdec->negotiated = TRUE;
404 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
406 switch (transition) {
407 case GST_STATE_READY_TO_NULL:
416 gst_rtpamrdec_plugin_init (GstPlugin * plugin)
418 return gst_element_register (plugin, "rtpamrdec",
419 GST_RANK_NONE, GST_TYPE_RTP_AMR_DEC);