Translate between signed linear and Global System for Mobile Communications (GSM) More...
#include "asterisk.h"#include "asterisk/translate.h"#include "asterisk/config.h"#include "asterisk/module.h"#include "asterisk/utils.h"#include "gsm.h"#include "../formats/msgsm.h"#include "asterisk/slin.h"#include "ex_gsm.h"
Go to the source code of this file.
Data Structures | |
| struct | gsm_translator_pvt |
Defines | |
| #define | BUFFER_SAMPLES 8000 |
| #define | GSM_FRAME_LEN 33 |
| #define | GSM_SAMPLES 160 |
| #define | MSGSM_FRAME_LEN 65 |
Functions | |
| static void | __reg_module (void) |
| static void | __unreg_module (void) |
| static void | gsm_destroy_stuff (struct ast_trans_pvt *pvt) |
| static int | gsm_new (struct ast_trans_pvt *pvt) |
| static int | gsmtolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
| decode and store in outbuf. | |
| static int | lintogsm_framein (struct ast_trans_pvt *pvt, struct ast_frame *f) |
| store samples into working buffer for later decode | |
| static struct ast_frame * | lintogsm_frameout (struct ast_trans_pvt *pvt) |
| encode and produce a frame | |
| static int | load_module (void) |
| static int | reload (void) |
| standard module glue | |
| static int | unload_module (void) |
Variables | |
| static struct ast_module_info | __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "GSM Coder/Decoder" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } |
| static struct ast_module_info * | ast_module_info = &__mod_info |
| static struct ast_translator | gsmtolin |
| static struct ast_translator | lintogsm |
Detailed Description
Translate between signed linear and Global System for Mobile Communications (GSM)
Definition in file codec_gsm.c.
Define Documentation
| #define BUFFER_SAMPLES 8000 |
Definition at line 51 of file codec_gsm.c.
Referenced by gsmtolin_framein(), and lintogsm_framein().
| #define GSM_FRAME_LEN 33 |
Definition at line 53 of file codec_gsm.c.
Referenced by gsmtolin_framein(), and lintogsm_frameout().
| #define GSM_SAMPLES 160 |
Definition at line 52 of file codec_gsm.c.
Referenced by gsm_sample(), gsmtolin_framein(), and lintogsm_frameout().
| #define MSGSM_FRAME_LEN 65 |
Definition at line 54 of file codec_gsm.c.
Referenced by gsmtolin_framein().
Function Documentation
| static void __reg_module | ( | void | ) | [static] |
Definition at line 233 of file codec_gsm.c.
| static void __unreg_module | ( | void | ) | [static] |
Definition at line 233 of file codec_gsm.c.
| static void gsm_destroy_stuff | ( | struct ast_trans_pvt * | pvt | ) | [static] |
Definition at line 163 of file codec_gsm.c.
References gsm_translator_pvt::gsm, and ast_trans_pvt::pvt.
{
struct gsm_translator_pvt *tmp = pvt->pvt;
if (tmp->gsm)
gsm_destroy(tmp->gsm);
}
| static int gsm_new | ( | struct ast_trans_pvt * | pvt | ) | [static] |
Definition at line 65 of file codec_gsm.c.
References gsm_translator_pvt::gsm, and ast_trans_pvt::pvt.
{
struct gsm_translator_pvt *tmp = pvt->pvt;
return (tmp->gsm = gsm_create()) ? 0 : -1;
}
| static int gsmtolin_framein | ( | struct ast_trans_pvt * | pvt, |
| struct ast_frame * | f | ||
| ) | [static] |
decode and store in outbuf.
Definition at line 73 of file codec_gsm.c.
References ast_log(), BUFFER_SAMPLES, conv65(), ast_frame::data, ast_frame::datalen, ast_trans_pvt::datalen, gsm_translator_pvt::gsm, GSM_FRAME_LEN, GSM_SAMPLES, ast_trans_pvt::i16, len(), LOG_WARNING, MSGSM_FRAME_LEN, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, and ast_trans_pvt::samples.
{
struct gsm_translator_pvt *tmp = pvt->pvt;
int x;
int16_t *dst = pvt->outbuf.i16;
/* guess format from frame len. 65 for MSGSM, 33 for regular GSM */
int flen = (f->datalen % MSGSM_FRAME_LEN == 0) ?
MSGSM_FRAME_LEN : GSM_FRAME_LEN;
for (x=0; x < f->datalen; x += flen) {
unsigned char data[2 * GSM_FRAME_LEN];
unsigned char *src;
int len;
if (flen == MSGSM_FRAME_LEN) {
len = 2*GSM_SAMPLES;
src = data;
/* Translate MSGSM format to Real GSM format before feeding in */
/* XXX what's the point here! we should just work
* on the full format.
*/
conv65(f->data.ptr + x, data);
} else {
len = GSM_SAMPLES;
src = f->data.ptr + x;
}
/* XXX maybe we don't need to check */
if (pvt->samples + len > BUFFER_SAMPLES) {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
}
if (gsm_decode(tmp->gsm, src, dst + pvt->samples)) {
ast_log(LOG_WARNING, "Invalid GSM data (1)\n");
return -1;
}
pvt->samples += GSM_SAMPLES;
pvt->datalen += 2 * GSM_SAMPLES;
if (flen == MSGSM_FRAME_LEN) {
if (gsm_decode(tmp->gsm, data + GSM_FRAME_LEN, dst + pvt->samples)) {
ast_log(LOG_WARNING, "Invalid GSM data (2)\n");
return -1;
}
pvt->samples += GSM_SAMPLES;
pvt->datalen += 2 * GSM_SAMPLES;
}
}
return 0;
}
| static int lintogsm_framein | ( | struct ast_trans_pvt * | pvt, |
| struct ast_frame * | f | ||
| ) | [static] |
store samples into working buffer for later decode
Definition at line 122 of file codec_gsm.c.
References ast_log(), gsm_translator_pvt::buf, BUFFER_SAMPLES, ast_frame::data, ast_frame::datalen, LOG_WARNING, ast_frame::ptr, ast_trans_pvt::pvt, ast_frame::samples, and ast_trans_pvt::samples.
{
struct gsm_translator_pvt *tmp = pvt->pvt;
/* XXX We should look at how old the rest of our stream is, and if it
is too old, then we should overwrite it entirely, otherwise we can
get artifacts of earlier talk that do not belong */
if (pvt->samples + f->samples > BUFFER_SAMPLES) {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
}
memcpy(tmp->buf + pvt->samples, f->data.ptr, f->datalen);
pvt->samples += f->samples;
return 0;
}
| static struct ast_frame* lintogsm_frameout | ( | struct ast_trans_pvt * | pvt | ) | [static, read] |
encode and produce a frame
Definition at line 139 of file codec_gsm.c.
References ast_trans_frameout(), gsm_translator_pvt::buf, ast_trans_pvt::c, gsm_translator_pvt::gsm, GSM_FRAME_LEN, GSM_SAMPLES, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, and ast_trans_pvt::samples.
{
struct gsm_translator_pvt *tmp = pvt->pvt;
int datalen = 0;
int samples = 0;
/* We can't work on anything less than a frame in size */
if (pvt->samples < GSM_SAMPLES)
return NULL;
while (pvt->samples >= GSM_SAMPLES) {
/* Encode a frame of data */
gsm_encode(tmp->gsm, tmp->buf + samples, (gsm_byte *) pvt->outbuf.c + datalen);
datalen += GSM_FRAME_LEN;
samples += GSM_SAMPLES;
pvt->samples -= GSM_SAMPLES;
}
/* Move the data at the end of the buffer to the front */
if (pvt->samples)
memmove(tmp->buf, tmp->buf + samples, pvt->samples * 2);
return ast_trans_frameout(pvt, datalen, samples);
}
| static int load_module | ( | void | ) | [static] |
Definition at line 209 of file codec_gsm.c.
References AST_FORMAT_GSM, ast_format_set(), AST_FORMAT_SLINEAR, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, ast_unregister_translator(), ast_translator::dst_format, and ast_translator::src_format.
{
int res;
ast_format_set(&gsmtolin.src_format, AST_FORMAT_GSM, 0);
ast_format_set(&gsmtolin.dst_format, AST_FORMAT_SLINEAR, 0);
ast_format_set(&lintogsm.src_format, AST_FORMAT_SLINEAR, 0);
ast_format_set(&lintogsm.dst_format, AST_FORMAT_GSM, 0);
res = ast_register_translator(&gsmtolin);
if (!res)
res=ast_register_translator(&lintogsm);
else
ast_unregister_translator(&gsmtolin);
if (res)
return AST_MODULE_LOAD_FAILURE;
return AST_MODULE_LOAD_SUCCESS;
}
| static int reload | ( | void | ) | [static] |
standard module glue
Definition at line 193 of file codec_gsm.c.
References AST_MODULE_LOAD_SUCCESS.
{
return AST_MODULE_LOAD_SUCCESS;
}
| static int unload_module | ( | void | ) | [static] |
Definition at line 198 of file codec_gsm.c.
References ast_unregister_translator().
{
int res;
res = ast_unregister_translator(&lintogsm);
if (!res)
res = ast_unregister_translator(&gsmtolin);
return res;
}
Variable Documentation
struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "GSM Coder/Decoder" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static] |
Definition at line 233 of file codec_gsm.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 233 of file codec_gsm.c.
struct ast_translator gsmtolin [static] |
Definition at line 170 of file codec_gsm.c.
struct ast_translator lintogsm [static] |
Definition at line 181 of file codec_gsm.c.
