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 AMR audio from RTP packets (RFC 3267)",
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 "media = (string) \"audio\", "
62 "payload = (int) [ 96, 255 ], "
63 "clock-rate = (int) 8000, "
64 "encoding-name = (string) \"AMR\", "
65 "encoding-params = (string) \"1\", "
66 "octet-align = (string) \"1\", "
67 "crc = (string) { \"0\", \"1\" }, "
68 "robust-sorting = (string) \"0\", " "interleaving = (string) \"0\""
69 /* following options are not needed for a decoder
71 "mode-set = (int) [ 0, 7 ], "
72 "mode-change-period = (int) [ 1, MAX ], "
73 "mode-change-neighbor = (boolean) { TRUE, FALSE }, "
74 "maxptime = (int) [ 20, MAX ], "
75 "ptime = (int) [ 20, MAX ]"
80 static GstStaticPadTemplate gst_rtpamrdec_src_template =
81 GST_STATIC_PAD_TEMPLATE ("src",
84 GST_STATIC_CAPS ("audio/AMR, " "channels = (int) 1," "rate = (int) 8000")
87 static void gst_rtpamrdec_class_init (GstRtpAMRDecClass * klass);
88 static void gst_rtpamrdec_base_init (GstRtpAMRDecClass * klass);
89 static void gst_rtpamrdec_init (GstRtpAMRDec * rtpamrdec);
91 static gboolean gst_rtpamrdec_sink_setcaps (GstPad * pad, GstCaps * caps);
92 static GstFlowReturn gst_rtpamrdec_chain (GstPad * pad, GstBuffer * buffer);
94 static void gst_rtpamrdec_set_property (GObject * object, guint prop_id,
95 const GValue * value, GParamSpec * pspec);
96 static void gst_rtpamrdec_get_property (GObject * object, guint prop_id,
97 GValue * value, GParamSpec * pspec);
99 static GstStateChangeReturn gst_rtpamrdec_change_state (GstElement * element,
100 GstStateChange transition);
102 static GstElementClass *parent_class = NULL;
105 gst_rtpamrdec_get_type (void)
107 static GType rtpamrdec_type = 0;
109 if (!rtpamrdec_type) {
110 static const GTypeInfo rtpamrdec_info = {
111 sizeof (GstRtpAMRDecClass),
112 (GBaseInitFunc) gst_rtpamrdec_base_init,
114 (GClassInitFunc) gst_rtpamrdec_class_init,
117 sizeof (GstRtpAMRDec),
119 (GInstanceInitFunc) gst_rtpamrdec_init,
123 g_type_register_static (GST_TYPE_ELEMENT, "GstRtpAMRDec",
126 return rtpamrdec_type;
130 gst_rtpamrdec_base_init (GstRtpAMRDecClass * klass)
132 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
134 gst_element_class_add_pad_template (element_class,
135 gst_static_pad_template_get (&gst_rtpamrdec_src_template));
136 gst_element_class_add_pad_template (element_class,
137 gst_static_pad_template_get (&gst_rtpamrdec_sink_template));
139 gst_element_class_set_details (element_class, &gst_rtp_amrdec_details);
143 gst_rtpamrdec_class_init (GstRtpAMRDecClass * klass)
145 GObjectClass *gobject_class;
146 GstElementClass *gstelement_class;
148 gobject_class = (GObjectClass *) klass;
149 gstelement_class = (GstElementClass *) klass;
151 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
153 gobject_class->set_property = gst_rtpamrdec_set_property;
154 gobject_class->get_property = gst_rtpamrdec_get_property;
156 gstelement_class->change_state = gst_rtpamrdec_change_state;
160 gst_rtpamrdec_init (GstRtpAMRDec * rtpamrdec)
163 gst_pad_new_from_template (gst_static_pad_template_get
164 (&gst_rtpamrdec_src_template), "src");
166 gst_element_add_pad (GST_ELEMENT (rtpamrdec), rtpamrdec->srcpad);
169 gst_pad_new_from_template (gst_static_pad_template_get
170 (&gst_rtpamrdec_sink_template), "sink");
171 gst_pad_set_setcaps_function (rtpamrdec->sinkpad, gst_rtpamrdec_sink_setcaps);
172 gst_pad_set_chain_function (rtpamrdec->sinkpad, gst_rtpamrdec_chain);
173 gst_element_add_pad (GST_ELEMENT (rtpamrdec), rtpamrdec->sinkpad);
177 gst_rtpamrdec_sink_setcaps (GstPad * pad, GstCaps * caps)
179 GstStructure *structure;
181 GstRtpAMRDec *rtpamrdec;
185 rtpamrdec = GST_RTP_AMR_DEC (GST_OBJECT_PARENT (pad));
187 structure = gst_caps_get_structure (caps, 0);
189 if (!(str = gst_structure_get_string (structure, "octet-align")))
190 rtpamrdec->octet_align = FALSE;
192 rtpamrdec->octet_align = (atoi (str) == 1);
194 if (!(str = gst_structure_get_string (structure, "crc")))
195 rtpamrdec->crc = FALSE;
197 rtpamrdec->crc = (atoi (str) == 1);
199 if (rtpamrdec->crc) {
200 /* crc mode implies octet aligned mode */
201 rtpamrdec->octet_align = TRUE;
204 if (!(str = gst_structure_get_string (structure, "robust-sorting")))
205 rtpamrdec->robust_sorting = FALSE;
207 rtpamrdec->robust_sorting = (atoi (str) == 1);
209 if (rtpamrdec->robust_sorting) {
210 /* robust_sorting mode implies octet aligned mode */
211 rtpamrdec->octet_align = TRUE;
214 if (!(str = gst_structure_get_string (structure, "interleaving")))
215 rtpamrdec->interleaving = FALSE;
217 rtpamrdec->interleaving = (atoi (str) == 1);
219 if (rtpamrdec->interleaving) {
220 /* interleaving mode implies octet aligned mode */
221 rtpamrdec->octet_align = TRUE;
224 if (!(params = gst_structure_get_string (structure, "encoding-params")))
225 rtpamrdec->channels = 1;
227 rtpamrdec->channels = atoi (params);
230 if (!gst_structure_get_int (structure, "clock-rate", &rtpamrdec->rate))
231 rtpamrdec->rate = 8000;
233 /* we require 1 channel, 8000 Hz, octet aligned, no CRC,
234 * no robust sorting, no interleaving for now */
235 if (rtpamrdec->channels != 1)
237 if (rtpamrdec->rate != 8000)
239 if (rtpamrdec->octet_align != TRUE)
241 if (rtpamrdec->robust_sorting != FALSE)
243 if (rtpamrdec->interleaving != FALSE)
246 srccaps = gst_caps_new_simple ("audio/AMR",
247 "channels", G_TYPE_INT, rtpamrdec->channels,
248 "rate", G_TYPE_INT, rtpamrdec->rate, NULL);
249 gst_pad_set_caps (rtpamrdec->srcpad, srccaps);
250 gst_caps_unref (srccaps);
252 rtpamrdec->negotiated = TRUE;
258 static gint frame_size[16] = {
259 12, 13, 15, 17, 19, 20, 26, 31,
260 5, -1, -1, -1, -1, -1, -1, 0
264 gst_rtpamrdec_chain (GstPad * pad, GstBuffer * buf)
266 GstRtpAMRDec *rtpamrdec;
270 rtpamrdec = GST_RTP_AMR_DEC (GST_OBJECT_PARENT (pad));
272 if (!rtpamrdec->negotiated)
275 if (!gst_rtpbuffer_validate (buf))
278 /* when we get here, 1 channel, 8000 Hz, octet aligned, no CRC,
279 * no robust sorting, no interleaving data is to be parsed */
282 guint8 *payload, *p, *dp;
285 gint i, num_packets, num_nonempty_packets;
289 payload_len = gst_rtpbuffer_get_payload_len (buf);
291 /* need at least 2 bytes for the header */
295 payload = gst_rtpbuffer_get_payload (buf);
297 /* parse CMR. The CMR is used by the sender to request
298 * a new encoding mode.
305 CMR = (payload[0] & 0xf0) >> 4;
307 /* strip CMR header now, pack FT and the data for the decoder */
311 if (rtpamrdec->interleaving) {
312 ILL = (payload[0] & 0xf0) >> 4;
313 ILP = (payload[0] & 0x0f);
323 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
324 * +-+-+-+-+-+-+-+-+..
325 * |F| FT |Q|P|P| more FT..
326 * +-+-+-+-+-+-+-+-+..
328 /* count number of packets by counting the FTs. Also
329 * count number of amr data bytes and number of non-empty
330 * packets (this is also the number of CRCs if present). */
332 num_nonempty_packets = 0;
334 for (i = 0; i < payload_len; i++) {
338 FT = (payload[i] & 0x78) >> 3;
340 fr_size = frame_size[FT];
346 num_nonempty_packets++;
350 if ((payload[i] & 0x80) == 0)
354 /* this is impossible */
355 if (num_packets == payload_len)
358 if (rtpamrdec->crc) {
359 /* data len + CRC len + header bytes should be smaller than payload_len */
360 if (num_packets + num_nonempty_packets + amr_len > payload_len)
363 /* data len + header bytes should be smaller than payload_len */
364 if (num_packets + amr_len > payload_len)
368 timestamp = gst_rtpbuffer_get_timestamp (buf);
370 outbuf = gst_buffer_new_and_alloc (payload_len);
371 GST_BUFFER_TIMESTAMP (outbuf) = timestamp * GST_SECOND / rtpamrdec->rate;
373 /* point to destination */
374 p = GST_BUFFER_DATA (outbuf);
375 /* point to first data packet */
376 dp = payload + num_packets;
377 if (rtpamrdec->crc) {
378 /* skip CRC if present */
379 dp += num_nonempty_packets;
382 for (i = 0; i < num_packets; i++) {
385 fr_size = frame_size[(payload[i] & 0x78) >> 3];
389 /* copy data packet, FIXME, calc CRC here. */
390 memcpy (p, dp, fr_size);
396 gst_buffer_set_caps (outbuf, GST_PAD_CAPS (rtpamrdec->srcpad));
398 GST_DEBUG ("gst_rtpamrdec_chain: pushing buffer of size %d",
399 GST_BUFFER_SIZE (outbuf));
400 ret = gst_pad_push (rtpamrdec->srcpad, outbuf);
402 gst_buffer_unref (buf);
409 GST_ELEMENT_ERROR (rtpamrdec, STREAM, NOT_IMPLEMENTED,
410 ("not negotiated"), (NULL));
411 gst_buffer_unref (buf);
412 return GST_FLOW_NOT_NEGOTIATED;
416 GST_ELEMENT_WARNING (rtpamrdec, STREAM, DECODE,
417 ("amr packet did not validate"), (NULL));
418 gst_buffer_unref (buf);
424 gst_rtpamrdec_set_property (GObject * object, guint prop_id,
425 const GValue * value, GParamSpec * pspec)
427 GstRtpAMRDec *rtpamrdec;
429 rtpamrdec = GST_RTP_AMR_DEC (object);
433 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
439 gst_rtpamrdec_get_property (GObject * object, guint prop_id, GValue * value,
442 GstRtpAMRDec *rtpamrdec;
444 rtpamrdec = GST_RTP_AMR_DEC (object);
448 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
453 static GstStateChangeReturn
454 gst_rtpamrdec_change_state (GstElement * element, GstStateChange transition)
456 GstRtpAMRDec *rtpamrdec;
457 GstStateChangeReturn ret;
459 rtpamrdec = GST_RTP_AMR_DEC (element);
461 switch (transition) {
462 case GST_STATE_CHANGE_NULL_TO_READY:
464 case GST_STATE_CHANGE_READY_TO_PAUSED:
470 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
472 switch (transition) {
473 case GST_STATE_CHANGE_READY_TO_NULL:
482 gst_rtpamrdec_plugin_init (GstPlugin * plugin)
484 return gst_element_register (plugin, "rtpamrdec",
485 GST_RANK_NONE, GST_TYPE_RTP_AMR_DEC);