2 * Asterisk -- An open source telephony toolkit.
4 * Copyright (C) 1999 - 2005, Digium, Inc.
6 * Mark Spencer <markster@digium.com>
8 * See http://www.asterisk.org for more information about
9 * the Asterisk project. Please do not directly contact
10 * any of the maintainers of this project for assistance;
11 * the project provides a web site, mailing lists and IRC
12 * channels for your use.
14 * This program is free software, distributed under the terms of
15 * the GNU General Public License Version 2. See the LICENSE file
16 * at the top of the source tree.
21 * \brief Save to raw, headerless G729 data.
22 * \note This is not an encoder/decoder. The codec fo g729 is only
23 * available with a commercial license from Digium, due to patent
24 * restrictions. Check http://www.digium.com for information.
25 * \arg Extensions: g729
31 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
34 #include <netinet/in.h>
35 #include <arpa/inet.h>
42 #include "asterisk/lock.h"
43 #include "asterisk/channel.h"
44 #include "asterisk/file.h"
45 #include "asterisk/logger.h"
46 #include "asterisk/sched.h"
47 #include "asterisk/module.h"
48 #include "asterisk/endian.h"
50 /* Some Ideas for this code came from makeg729e.c by Jeffrey Chilton */
52 /* Portions of the conversion code are by guido@sienanet.it */
54 #define BUF_SIZE 20 /* two G729 frames */
55 #define G729A_SAMPLES 160
57 static struct ast_frame *g729_read(struct ast_filestream *s, int *whennext)
60 /* Send a frame from the file to the appropriate channel */
61 s->fr.frametype = AST_FRAME_VOICE;
62 s->fr.subclass = AST_FORMAT_G729A;
64 s->fr.samples = G729A_SAMPLES;
65 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
66 if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
67 if (res && (res != 10)) /* XXX what for ? */
68 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
71 *whennext = s->fr.samples;
75 static int g729_write(struct ast_filestream *fs, struct ast_frame *f)
78 if (f->frametype != AST_FRAME_VOICE) {
79 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
82 if (f->subclass != AST_FORMAT_G729A) {
83 ast_log(LOG_WARNING, "Asked to write non-G729 frame (%d)!\n", f->subclass);
86 if (f->datalen % 10) {
87 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 10\n", f->datalen);
90 if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
91 ast_log(LOG_WARNING, "Bad write (%d/10): %s\n", res, strerror(errno));
97 static int g729_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
100 off_t min,cur,max,offset=0;
103 fseeko(fs->f, 0, SEEK_END);
106 bytes = BUF_SIZE * (sample_offset / G729A_SAMPLES);
107 if (whence == SEEK_SET)
109 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
110 offset = cur + bytes;
111 else if (whence == SEEK_END)
112 offset = max - bytes;
113 if (whence != SEEK_FORCECUR) {
114 offset = (offset > max)?max:offset;
116 /* protect against seeking beyond begining. */
117 offset = (offset < min)?min:offset;
118 if (fseeko(fs->f, offset, SEEK_SET) < 0)
123 static int g729_trunc(struct ast_filestream *fs)
125 /* Truncate file to current length */
126 if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
131 static off_t g729_tell(struct ast_filestream *fs)
133 off_t offset = ftello(fs->f);
134 return (offset/BUF_SIZE)*G729A_SAMPLES;
137 static const struct ast_format g729_f = {
140 .format = AST_FORMAT_G729A,
146 .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
149 static int load_module(void)
151 if (ast_format_register(&g729_f))
152 return AST_MODULE_LOAD_FAILURE;
153 return AST_MODULE_LOAD_SUCCESS;
156 static int unload_module(void)
158 return ast_format_unregister(g729_f.name);
161 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw G729 data");