2 * Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
3 * Copyright (C) 2005 Edgard Lima <edgard.lima@indt.org.br>
4 * Copyright (C) 2005 Zeeshan Ali <zeenix@gmail.com>
5 * Copyright (C) 2008 Axis Communications <dev-gstreamer@axis.com>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
30 #include <gst/rtp/gstrtpbuffer.h>
32 #include "gstrtpg726depay.h"
34 GST_DEBUG_CATEGORY_STATIC (rtpg726depay_debug);
35 #define GST_CAT_DEFAULT (rtpg726depay_debug)
37 #define DEFAULT_BIT_RATE 32000
38 #define SAMPLE_RATE 8000
39 #define LAYOUT_G726 "g726"
41 /* RtpG726Depay signals and args */
48 #define DEFAULT_FORCE_AAL2 TRUE
57 static GstStaticPadTemplate gst_rtp_g726_depay_sink_template =
58 GST_STATIC_PAD_TEMPLATE ("sink",
61 GST_STATIC_CAPS ("application/x-rtp, "
62 "media = (string) \"audio\", "
63 "encoding-name = (string) { \"G726\", \"G726-16\", \"G726-24\", \"G726-32\", \"G726-40\", "
64 "\"AAL2-G726-16\", \"AAL2-G726-24\", \"AAL2-G726-32\", \"AAL2-G726-40\" }, "
65 "clock-rate = (int) 8000;")
68 static GstStaticPadTemplate gst_rtp_g726_depay_src_template =
69 GST_STATIC_PAD_TEMPLATE ("src",
72 GST_STATIC_CAPS ("audio/x-adpcm, "
73 "channels = (int) 1, "
75 "bitrate = (int) { 16000, 24000, 32000, 40000 }, "
76 "layout = (string) \"g726\"")
79 static void gst_rtp_g726_depay_get_property (GObject * object, guint prop_id,
80 GValue * value, GParamSpec * pspec);
81 static void gst_rtp_g726_depay_set_property (GObject * object, guint prop_id,
82 const GValue * value, GParamSpec * pspec);
84 static GstBuffer *gst_rtp_g726_depay_process (GstRTPBaseDepayload * depayload,
86 static gboolean gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload,
89 #define gst_rtp_g726_depay_parent_class parent_class
90 G_DEFINE_TYPE (GstRtpG726Depay, gst_rtp_g726_depay,
91 GST_TYPE_RTP_BASE_DEPAYLOAD);
94 gst_rtp_g726_depay_class_init (GstRtpG726DepayClass * klass)
96 GObjectClass *gobject_class;
97 GstElementClass *gstelement_class;
98 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
100 GST_DEBUG_CATEGORY_INIT (rtpg726depay_debug, "rtpg726depay", 0,
101 "G.726 RTP Depayloader");
103 gobject_class = (GObjectClass *) klass;
104 gstelement_class = (GstElementClass *) klass;
105 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
107 gobject_class->set_property = gst_rtp_g726_depay_set_property;
108 gobject_class->get_property = gst_rtp_g726_depay_get_property;
110 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_FORCE_AAL2,
111 g_param_spec_boolean ("force-aal2", "Force AAL2",
112 "Force AAL2 decoding for compatibility with bad payloaders",
113 DEFAULT_FORCE_AAL2, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
115 gst_element_class_add_pad_template (gstelement_class,
116 gst_static_pad_template_get (&gst_rtp_g726_depay_src_template));
117 gst_element_class_add_pad_template (gstelement_class,
118 gst_static_pad_template_get (&gst_rtp_g726_depay_sink_template));
120 gst_element_class_set_static_metadata (gstelement_class,
121 "RTP G.726 depayloader", "Codec/Depayloader/Network/RTP",
122 "Extracts G.726 audio from RTP packets",
123 "Axis Communications <dev-gstreamer@axis.com>");
125 gstrtpbasedepayload_class->process = gst_rtp_g726_depay_process;
126 gstrtpbasedepayload_class->set_caps = gst_rtp_g726_depay_setcaps;
130 gst_rtp_g726_depay_init (GstRtpG726Depay * rtpG726depay)
132 GstRTPBaseDepayload *depayload;
134 depayload = GST_RTP_BASE_DEPAYLOAD (rtpG726depay);
136 gst_pad_use_fixed_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload));
138 rtpG726depay->force_aal2 = DEFAULT_FORCE_AAL2;
142 gst_rtp_g726_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
145 GstStructure *structure;
148 const gchar *encoding_name;
149 GstRtpG726Depay *depay;
151 depay = GST_RTP_G726_DEPAY (depayload);
153 structure = gst_caps_get_structure (caps, 0);
155 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
156 clock_rate = 8000; /* default */
157 depayload->clock_rate = clock_rate;
160 encoding_name = gst_structure_get_string (structure, "encoding-name");
161 if (encoding_name == NULL || g_ascii_strcasecmp (encoding_name, "G726") == 0) {
162 depay->bitrate = DEFAULT_BIT_RATE;
164 if (g_str_has_prefix (encoding_name, "AAL2-")) {
168 if (g_ascii_strcasecmp (encoding_name, "G726-16") == 0) {
169 depay->bitrate = 16000;
170 } else if (g_ascii_strcasecmp (encoding_name, "G726-24") == 0) {
171 depay->bitrate = 24000;
172 } else if (g_ascii_strcasecmp (encoding_name, "G726-32") == 0) {
173 depay->bitrate = 32000;
174 } else if (g_ascii_strcasecmp (encoding_name, "G726-40") == 0) {
175 depay->bitrate = 40000;
177 goto unknown_encoding;
180 GST_DEBUG ("RTP G.726 depayloader, bitrate set to %d\n", depay->bitrate);
182 srccaps = gst_caps_new_simple ("audio/x-adpcm",
183 "channels", G_TYPE_INT, 1,
184 "rate", G_TYPE_INT, clock_rate,
185 "bitrate", G_TYPE_INT, depay->bitrate,
186 "layout", G_TYPE_STRING, LAYOUT_G726, NULL);
188 ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
189 gst_caps_unref (srccaps);
196 GST_WARNING ("Could not determine bitrate from encoding-name (%s)",
204 gst_rtp_g726_depay_process (GstRTPBaseDepayload * depayload, GstBuffer * buf)
206 GstRtpG726Depay *depay;
207 GstBuffer *outbuf = NULL;
209 GstRTPBuffer rtp = { NULL };
211 depay = GST_RTP_G726_DEPAY (depayload);
213 gst_rtp_buffer_map (buf, GST_MAP_READWRITE, &rtp);
215 marker = gst_rtp_buffer_get_marker (&rtp);
217 GST_DEBUG ("process : got %" G_GSIZE_FORMAT " bytes, mark %d ts %u seqn %d",
218 gst_buffer_get_size (buf), marker,
219 gst_rtp_buffer_get_timestamp (&rtp), gst_rtp_buffer_get_seq (&rtp));
221 if (depay->aal2 || depay->force_aal2) {
222 /* AAL2, we can just copy the bytes */
223 outbuf = gst_rtp_buffer_get_payload_buffer (&rtp);
227 guint8 *in, *out, tmp;
231 in = gst_rtp_buffer_get_payload (&rtp);
232 len = gst_rtp_buffer_get_payload_len (&rtp);
234 outbuf = gst_rtp_buffer_get_payload_buffer (&rtp);
237 outbuf = gst_buffer_make_writable (outbuf);
239 gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
242 /* we need to reshuffle the bytes, input is always of the form
243 * A B C D ... with the number of bits depending on the bitrate. */
244 switch (depay->bitrate) {
250 * |D D|C C|B B|A A| ...
256 *out++ = ((tmp & 0xc0) >> 6) |
257 ((tmp & 0x30) >> 2) | ((tmp & 0x0c) << 2) | ((tmp & 0x03) << 6);
265 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
266 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
267 * |C C|B B B|A A A|F|E E E|D D D|C|H H H|G G G|F F| ...
268 * |1 2|0 1 2|0 1 2|2|0 1 2|0 1 2|0|0 1 2|0 1 2|0 1|
269 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
273 *out++ = ((tmp & 0xe0) >> 5) |
274 ((tmp & 0x1c) << 1) | ((tmp & 0x03) << 6);
276 *out++ = ((tmp & 0x80) >> 7) |
277 ((tmp & 0x70) >> 3) | ((tmp & 0x0e) << 4) | ((tmp & 0x01) << 7);
279 *out++ = ((tmp & 0xc0) >> 6) |
280 ((tmp & 0x38) >> 1) | ((tmp & 0x07) << 5);
288 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
289 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
290 * |B B B B|A A A A|D D D D|C C C C| ...
291 * |0 1 2 3|0 1 2 3|0 1 2 3|0 1 2 3|
292 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
296 *out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
304 * 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 2 3 4 5 6 7 8 9 0
305 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
306 * |B B B|A A A A A|D|C C C C C|B B|E E E E|D D D D|G G|F F F F F|E|H H H H H|G G G|
307 * |2 3 4|0 1 2 3 4|4|0 1 2 3 4|0 1|1 2 3 4|0 1 2 3|3 4|0 1 2 3 4|0|0 1 2 3 4|0 1 2|
308 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
312 *out++ = ((tmp & 0xf8) >> 3) | ((tmp & 0x07) << 5);
314 *out++ = ((tmp & 0xc0) >> 6) |
315 ((tmp & 0x3e) << 1) | ((tmp & 0x01) << 7);
317 *out++ = ((tmp & 0xf0) >> 4) | ((tmp & 0x0f) << 4);
319 *out++ = ((tmp & 0x80) >> 7) |
320 ((tmp & 0x7c) >> 1) | ((tmp & 0x03) << 6);
322 *out++ = ((tmp & 0xe0) >> 5) | ((tmp & 0x1f) << 3);
328 gst_buffer_unmap (outbuf, &map);
332 /* mark start of talkspurt with RESYNC */
333 GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_RESYNC);
343 gst_rtp_g726_depay_set_property (GObject * object, guint prop_id,
344 const GValue * value, GParamSpec * pspec)
346 GstRtpG726Depay *rtpg726depay;
348 rtpg726depay = GST_RTP_G726_DEPAY (object);
351 case PROP_FORCE_AAL2:
352 rtpg726depay->force_aal2 = g_value_get_boolean (value);
355 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
361 gst_rtp_g726_depay_get_property (GObject * object, guint prop_id,
362 GValue * value, GParamSpec * pspec)
364 GstRtpG726Depay *rtpg726depay;
366 rtpg726depay = GST_RTP_G726_DEPAY (object);
369 case PROP_FORCE_AAL2:
370 g_value_set_boolean (value, rtpg726depay->force_aal2);
373 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
379 gst_rtp_g726_depay_plugin_init (GstPlugin * plugin)
381 return gst_element_register (plugin, "rtpg726depay",
382 GST_RANK_SECONDARY, GST_TYPE_RTP_G726_DEPAY);