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 "../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 __MODULE_INFO_SECTION | __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "GSM Coder/Decoder" , .key = ASTERISK_GPL_KEY , .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 |
Translate between signed linear and Global System for Mobile Communications (GSM)
Definition in file codec_gsm.c.
#define BUFFER_SAMPLES 8000 |
Definition at line 50 of file codec_gsm.c.
Referenced by gsmtolin_framein(), and lintogsm_framein().
#define GSM_FRAME_LEN 33 |
Definition at line 52 of file codec_gsm.c.
Referenced by gsmtolin_framein(), and lintogsm_frameout().
#define GSM_SAMPLES 160 |
Definition at line 51 of file codec_gsm.c.
Referenced by gsm_sample(), gsmtolin_framein(), and lintogsm_frameout().
#define MSGSM_FRAME_LEN 65 |
Definition at line 53 of file codec_gsm.c.
Referenced by gsmtolin_framein().
static void __reg_module | ( | void | ) | [static] |
Definition at line 230 of file codec_gsm.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 230 of file codec_gsm.c.
static void gsm_destroy_stuff | ( | struct ast_trans_pvt * | pvt | ) | [static] |
Definition at line 162 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 64 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 72 of file codec_gsm.c.
References ast_log(), BUFFER_SAMPLES, conv65(), ast_frame::data, ast_trans_pvt::datalen, ast_frame::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 121 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 138 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 212 of file codec_gsm.c.
References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, and ast_unregister_translator().
{ int res; 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 196 of file codec_gsm.c.
References AST_MODULE_LOAD_SUCCESS.
{ return AST_MODULE_LOAD_SUCCESS; }
static int unload_module | ( | void | ) | [static] |
Definition at line 201 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; }
struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "GSM Coder/Decoder" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static] |
Definition at line 230 of file codec_gsm.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 230 of file codec_gsm.c.
struct ast_translator gsmtolin [static] |
Definition at line 169 of file codec_gsm.c.
struct ast_translator lintogsm [static] |
Definition at line 182 of file codec_gsm.c.