Asterisk - The Open Source Telephony Project GIT-master-f3e88d3
codec_g722.c
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1/*
2 * Asterisk -- An open source telephony toolkit.
3 *
4 * Copyright (C) 1999 - 2008, Digium, Inc.
5 *
6 * Matthew Fredrickson <creslin@digium.com>
7 * Russell Bryant <russell@digium.com>
8 *
9 * Special thanks to Steve Underwood for the implementation
10 * and for doing the 8khz<->g.722 direct translation code.
11 *
12 * See http://www.asterisk.org for more information about
13 * the Asterisk project. Please do not directly contact
14 * any of the maintainers of this project for assistance;
15 * the project provides a web site, mailing lists and IRC
16 * channels for your use.
17 *
18 * This program is free software, distributed under the terms of
19 * the GNU General Public License Version 2. See the LICENSE file
20 * at the top of the source tree.
21 */
22
23/*! \file
24 *
25 * \brief codec_g722.c - translate between signed linear and ITU G.722-64kbps
26 *
27 * \author Matthew Fredrickson <creslin@digium.com>
28 * \author Russell Bryant <russell@digium.com>
29 *
30 * \arg http://soft-switch.org/downloads/non-gpl-bits.tgz
31 * \arg http://lists.digium.com/pipermail/asterisk-dev/2006-September/022866.html
32 *
33 * \ingroup codecs
34 */
35
36/*** MODULEINFO
37 <support_level>core</support_level>
38 ***/
39
40#include "asterisk.h"
41
43#include "asterisk/module.h"
44#include "asterisk/config.h"
45#include "asterisk/translate.h"
46#include "asterisk/utils.h"
47
48#define BUFFER_SAMPLES 8096 /* size for the translation buffers */
49#define BUF_SHIFT 5
50
51#include "g722/g722.h"
52
53/* Sample frame data */
54#include "asterisk/slin.h"
55#include "ex_g722.h"
56
59};
60
63};
64
65/*! \brief init a new instance of g722_encoder_pvt. */
66static int lintog722_new(struct ast_trans_pvt *pvt)
67{
68 struct g722_encoder_pvt *tmp = pvt->pvt;
69
71
72 return 0;
73}
74
75static int lin16tog722_new(struct ast_trans_pvt *pvt)
76{
77 struct g722_encoder_pvt *tmp = pvt->pvt;
78
79 g722_encode_init(&tmp->g722, 64000, 0);
80
81 return 0;
82}
83
84/*! \brief init a new instance of g722_encoder_pvt. */
85static int g722tolin_new(struct ast_trans_pvt *pvt)
86{
87 struct g722_decoder_pvt *tmp = pvt->pvt;
88
90
91 return 0;
92}
93
94static int g722tolin16_new(struct ast_trans_pvt *pvt)
95{
96 struct g722_decoder_pvt *tmp = pvt->pvt;
97
98 g722_decode_init(&tmp->g722, 64000, 0);
99
100 return 0;
101}
102
103static int g722tolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
104{
105 struct g722_decoder_pvt *tmp = pvt->pvt;
106 int out_samples;
107 int in_samples;
108
109 /* g722_decode expects the samples to be in the invalid samples / 2 format */
110 in_samples = f->samples / 2;
111
112 out_samples = g722_decode(&tmp->g722, &pvt->outbuf.i16[pvt->samples * sizeof(int16_t)],
113 (uint8_t *) f->data.ptr, in_samples);
114
115 pvt->samples += out_samples;
116
117 pvt->datalen += (out_samples * sizeof(int16_t));
118
119 return 0;
120}
121
122static int lintog722_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
123{
124 struct g722_encoder_pvt *tmp = pvt->pvt;
125 int outlen;
126
127 outlen = g722_encode(&tmp->g722, (&pvt->outbuf.ui8[pvt->datalen]),
128 (int16_t *) f->data.ptr, f->samples);
129
130 pvt->samples += outlen * 2;
131
132 pvt->datalen += outlen;
133
134 return 0;
135}
136
137static struct ast_translator g722tolin = {
138 .name = "g722tolin",
139 .src_codec = {
140 .name = "g722",
141 .type = AST_MEDIA_TYPE_AUDIO,
142 .sample_rate = 16000,
143 },
144 .dst_codec = {
145 .name = "slin",
146 .type = AST_MEDIA_TYPE_AUDIO,
147 .sample_rate = 8000,
148 },
149 .format = "slin",
150 .newpvt = g722tolin_new, /* same for both directions */
151 .framein = g722tolin_framein,
152 .sample = g722_sample,
153 .desc_size = sizeof(struct g722_decoder_pvt),
154 .buffer_samples = BUFFER_SAMPLES / sizeof(int16_t),
155 .buf_size = BUFFER_SAMPLES,
156};
157
158static struct ast_translator lintog722 = {
159 .name = "lintog722",
160 .src_codec = {
161 .name = "slin",
162 .type = AST_MEDIA_TYPE_AUDIO,
163 .sample_rate = 8000,
164 },
165 .dst_codec = {
166 .name = "g722",
167 .type = AST_MEDIA_TYPE_AUDIO,
168 .sample_rate = 16000,
169 },
170 .format = "g722",
171 .newpvt = lintog722_new, /* same for both directions */
172 .framein = lintog722_framein,
173 .sample = slin8_sample,
174 .desc_size = sizeof(struct g722_encoder_pvt),
175 .buffer_samples = BUFFER_SAMPLES * 2,
176 .buf_size = BUFFER_SAMPLES,
177};
178
180 .name = "g722tolin16",
181 .src_codec = {
182 .name = "g722",
183 .type = AST_MEDIA_TYPE_AUDIO,
184 .sample_rate = 16000,
185 },
186 .dst_codec = {
187 .name = "slin",
188 .type = AST_MEDIA_TYPE_AUDIO,
189 .sample_rate = 16000,
190 },
191 .format = "slin16",
192 .newpvt = g722tolin16_new, /* same for both directions */
193 .framein = g722tolin_framein,
194 .sample = g722_sample,
195 .desc_size = sizeof(struct g722_decoder_pvt),
196 .buffer_samples = BUFFER_SAMPLES / sizeof(int16_t),
197 .buf_size = BUFFER_SAMPLES,
198};
199
201 .name = "lin16tog722",
202 .src_codec = {
203 .name = "slin",
204 .type = AST_MEDIA_TYPE_AUDIO,
205 .sample_rate = 16000,
206 },
207 .dst_codec = {
208 .name = "g722",
209 .type = AST_MEDIA_TYPE_AUDIO,
210 .sample_rate = 16000,
211 },
212 .format = "g722",
213 .newpvt = lin16tog722_new, /* same for both directions */
214 .framein = lintog722_framein,
215 .sample = slin16_sample,
216 .desc_size = sizeof(struct g722_encoder_pvt),
217 .buffer_samples = BUFFER_SAMPLES * 2,
218 .buf_size = BUFFER_SAMPLES,
219};
220
221static int unload_module(void)
222{
223 int res = 0;
224
229
230 return res;
231}
232
233static int load_module(void)
234{
235 int res = 0;
236
241
242 if (res) {
245 }
246
248}
249
250AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "ITU G.722-64kbps G722 Transcoder",
251 .support_level = AST_MODULE_SUPPORT_CORE,
252 .load = load_module,
253 .unload = unload_module,
Asterisk main include file. File version handling, generic pbx functions.
static int tmp()
Definition: bt_open.c:389
@ AST_MEDIA_TYPE_AUDIO
Definition: codec.h:32
static int g722tolin16_new(struct ast_trans_pvt *pvt)
Definition: codec_g722.c:94
#define BUFFER_SAMPLES
Definition: codec_g722.c:48
static int g722tolin_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
Definition: codec_g722.c:103
static int g722tolin_new(struct ast_trans_pvt *pvt)
init a new instance of g722_encoder_pvt.
Definition: codec_g722.c:85
static struct ast_translator g722tolin16
Definition: codec_g722.c:179
static struct ast_translator lin16tog722
Definition: codec_g722.c:200
static struct ast_translator lintog722
Definition: codec_g722.c:158
static struct ast_translator g722tolin
Definition: codec_g722.c:137
static int lintog722_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
Definition: codec_g722.c:122
static int load_module(void)
Definition: codec_g722.c:233
static int unload_module(void)
Definition: codec_g722.c:221
static int lintog722_new(struct ast_trans_pvt *pvt)
init a new instance of g722_encoder_pvt.
Definition: codec_g722.c:66
static int lin16tog722_new(struct ast_trans_pvt *pvt)
Definition: codec_g722.c:75
short int16_t
Definition: db.h:59
8-bit data
static struct ast_frame * g722_sample(void)
Definition: ex_g722.h:36
int g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len)
Definition: g722_encode.c:185
g722_encode_state_t * g722_encode_init(g722_encode_state_t *s, int rate, int options)
Definition: g722_encode.c:152
int g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len)
Definition: g722_decode.c:186
@ G722_SAMPLE_RATE_8000
Definition: g722.h:45
g722_decode_state_t * g722_decode_init(g722_decode_state_t *s, int rate, int options)
Definition: g722_decode.c:153
Configuration File Parser.
A set of macros to manage forward-linked lists.
Asterisk module definitions.
@ AST_MODFLAG_DEFAULT
Definition: module.h:329
#define AST_MODULE_INFO(keystr, flags_to_set, desc, fields...)
Definition: module.h:557
@ AST_MODULE_SUPPORT_CORE
Definition: module.h:121
#define ASTERISK_GPL_KEY
The text the key() function should return.
Definition: module.h:46
@ AST_MODULE_LOAD_SUCCESS
Definition: module.h:70
@ AST_MODULE_LOAD_DECLINE
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
static struct ast_frame * slin8_sample(void)
Definition: slin.h:64
static struct ast_frame * slin16_sample(void)
Definition: slin.h:81
Data structure associated with a single frame of data.
union ast_frame::@226 data
Default structure for translators, with the basic fields and buffers, all allocated as part of the sa...
Definition: translate.h:213
void * pvt
Definition: translate.h:219
uint8_t * ui8
Definition: translate.h:224
int datalen
actual space used in outbuf
Definition: translate.h:218
union ast_trans_pvt::@287 outbuf
int16_t * i16
Definition: translate.h:223
Descriptor of a translator.
Definition: translate.h:137
char name[80]
Definition: translate.h:138
g722_decode_state_t g722
Definition: codec_g722.c:62
g722_encode_state_t g722
Definition: codec_g722.c:58
Support for translation of data formats. translate.c.
#define ast_register_translator(t)
See __ast_register_translator()
Definition: translate.h:258
int ast_unregister_translator(struct ast_translator *t)
Unregister a translator Unregisters the given translator.
Definition: translate.c:1350
Utility functions.