267 lines
6.2 KiB
C
267 lines
6.2 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (c) 2004 - 2005, inAccess Networks
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*
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* Michael Manousos <manousos@inaccessnetworks.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!\file
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*
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* \brief Headerless G.726 (16/24/32/40kbps) data format for Asterisk.
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*
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* File name extensions:
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* \arg 40 kbps: g726-40
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* \arg 32 kbps: g726-32
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* \arg 24 kbps: g726-24
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* \arg 16 kbps: g726-16
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* \ingroup formats
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/mod_format.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#define RATE_40 0
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#define RATE_32 1
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#define RATE_24 2
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#define RATE_16 3
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/* We can only read/write chunks of FRAME_TIME ms G.726 data */
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#define FRAME_TIME 10 /* 10 ms size */
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#define BUF_SIZE (5*FRAME_TIME) /* max frame size in bytes ? */
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/* Frame sizes in bytes */
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static int frame_size[4] = {
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FRAME_TIME * 5,
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FRAME_TIME * 4,
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FRAME_TIME * 3,
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FRAME_TIME * 2
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};
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struct g726_desc {
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int rate; /* RATE_* defines */
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};
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/*
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* Rate dependant format functions (open, rewrite)
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*/
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static int g726_open(struct ast_filestream *tmp, int rate)
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{
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struct g726_desc *s = (struct g726_desc *)tmp->_private;
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s->rate = rate;
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ast_debug(1, "Created filestream G.726-%dk.\n", 40 - s->rate * 8);
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return 0;
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}
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static int g726_40_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_40);
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}
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static int g726_32_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_32);
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}
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static int g726_24_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_24);
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}
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static int g726_16_open(struct ast_filestream *s)
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{
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return g726_open(s, RATE_16);
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}
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static int g726_40_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_40);
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}
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static int g726_32_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_32);
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}
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static int g726_24_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_24);
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}
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static int g726_16_rewrite(struct ast_filestream *s, const char *comment)
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{
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return g726_open(s, RATE_16);
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}
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/*
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* Rate independent format functions (read, write)
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*/
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static struct ast_frame *g726_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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struct g726_desc *fs = (struct g726_desc *)s->_private;
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/* Send a frame from the file to the appropriate channel */
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s->fr.frametype = AST_FRAME_VOICE;
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ast_format_set(&s->fr.subclass.format, AST_FORMAT_G726, 0);
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s->fr.mallocd = 0;
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AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, frame_size[fs->rate]);
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s->fr.samples = 8 * FRAME_TIME;
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if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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*whennext = s->fr.samples;
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return &s->fr;
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}
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static int g726_write(struct ast_filestream *s, struct ast_frame *f)
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{
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int res;
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struct g726_desc *fs = (struct g726_desc *)s->_private;
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass.format.id != AST_FORMAT_G726) {
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ast_log(LOG_WARNING, "Asked to write non-G726 frame (%s)!\n",
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ast_getformatname(&f->subclass.format));
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return -1;
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}
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if (f->datalen % frame_size[fs->rate]) {
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ast_log(LOG_WARNING, "Invalid data length %d, should be multiple of %d\n",
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f->datalen, frame_size[fs->rate]);
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return -1;
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}
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if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n",
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res, frame_size[fs->rate], strerror(errno));
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return -1;
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}
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return 0;
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}
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static int g726_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
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{
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return -1;
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}
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static int g726_trunc(struct ast_filestream *fs)
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{
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return -1;
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}
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static off_t g726_tell(struct ast_filestream *fs)
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{
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return -1;
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}
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static struct ast_format_def f[] = {
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{
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.name = "g726-40",
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.exts = "g726-40",
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.open = g726_40_open,
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.rewrite = g726_40_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{
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.name = "g726-32",
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.exts = "g726-32",
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.open = g726_32_open,
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.rewrite = g726_32_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{
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.name = "g726-24",
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.exts = "g726-24",
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.open = g726_24_open,
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.rewrite = g726_24_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{
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.name = "g726-16",
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.exts = "g726-16",
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.open = g726_16_open,
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.rewrite = g726_16_rewrite,
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.write = g726_write,
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.seek = g726_seek,
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.trunc = g726_trunc,
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.tell = g726_tell,
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.read = g726_read,
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.buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
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.desc_size = sizeof(struct g726_desc),
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},
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{ .desc_size = 0 } /* terminator */
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};
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static int load_module(void)
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{
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int i;
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for (i = 0; f[i].desc_size ; i++) {
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ast_format_set(&f[i].format, AST_FORMAT_G726, 0);
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if (ast_format_def_register(&f[i])) { /* errors are fatal */
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ast_log(LOG_WARNING, "Failed to register format %s.\n", f[i].name);
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return AST_MODULE_LOAD_FAILURE;
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}
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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int i;
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for (i = 0; f[i].desc_size ; i++) {
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if (ast_format_def_unregister(f[i].name))
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ast_log(LOG_WARNING, "Failed to unregister format %s.\n", f[i].name);
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}
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return(0);
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw G.726 (16/24/32/40kbps) data",
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND
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);
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