codec_g722.c File Reference

codec_g722.c - translate between signed linear and ITU G.722-64kbps More...

#include "asterisk.h"
#include "asterisk/linkedlists.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/translate.h"
#include "asterisk/utils.h"
#include "g722/g722.h"
#include "asterisk/slin.h"
#include "ex_g722.h"

Include dependency graph for codec_g722.c:

Go to the source code of this file.

Data Structures
struct	g722_decoder_pvt
struct	g722_encoder_pvt
Defines
#define	BUF_SHIFT 5
#define	BUFFER_SAMPLES 8096
Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	g722tolin16_new (struct ast_trans_pvt *pvt)
static int	g722tolin_framein (struct ast_trans_pvt pvt, struct ast_frame f)
static int	g722tolin_new (struct ast_trans_pvt *pvt)
	init a new instance of g722_encoder_pvt.
static int	lin16tog722_new (struct ast_trans_pvt *pvt)
static int	lintog722_framein (struct ast_trans_pvt pvt, struct ast_frame f)
static int	lintog722_new (struct ast_trans_pvt *pvt)
	init a new instance of g722_encoder_pvt.
static int	load_module (void)
static int	parse_config (int reload)
static int	reload (void)
static int	unload_module (void)
Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "ITU G.722-64kbps G722 Transcoder" , .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 = "0901e4e500243c855563a2d78b0c03e4" , .load = load_module, .unload = unload_module, .reload = reload, }
static struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_translator	g722tolin
static struct ast_translator	g722tolin16
static struct ast_translator	lin16tog722
static struct ast_translator	lintog722

Detailed Description

codec_g722.c - translate between signed linear and ITU G.722-64kbps

Author:: Matthew Fredrickson <creslin@digium.com>; Russell Bryant <russell@digium.com>

Definition in file codec_g722.c.

Define Documentation

#define BUF_SHIFT 5

Definition at line 47 of file codec_g722.c.

#define BUFFER_SAMPLES 8096

Definition at line 46 of file codec_g722.c.

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 247 of file codec_g722.c.

static void __unreg_module ( void ) [static]

Definition at line 247 of file codec_g722.c.

static int g722tolin16_new ( struct ast_trans_pvt * pvt ) [static]

Definition at line 92 of file codec_g722.c.

References g722_decoder_pvt::g722, and ast_trans_pvt::pvt.

00093 {
00094    struct g722_decoder_pvt *tmp = pvt->pvt;
00095 
00096    g722_decode_init(&tmp->g722, 64000, 0);
00097 
00098    return 0;
00099 }

static int g722tolin_framein	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)			`[static]`

Definition at line 101 of file codec_g722.c.

References ast_frame::data, ast_trans_pvt::datalen, g722_decoder_pvt::g722, ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, and ast_frame::samples.

00102 {
00103    struct g722_decoder_pvt *tmp = pvt->pvt;
00104    int out_samples;
00105    int in_samples;
00106 
00107    /* g722_decode expects the samples to be in the invalid samples / 2 format */
00108    in_samples = f->samples / 2;
00109 
00110    out_samples = g722_decode(&tmp->g722, &pvt->outbuf.i16[pvt->samples * sizeof(int16_t)], 
00111       (uint8_t *) f->data.ptr, in_samples);
00112 
00113    pvt->samples += out_samples;
00114 
00115    pvt->datalen += (out_samples * sizeof(int16_t));
00116 
00117    return 0;
00118 }

static int g722tolin_new ( struct ast_trans_pvt * pvt ) [static]

init a new instance of g722_encoder_pvt.

Definition at line 83 of file codec_g722.c.

References g722_decoder_pvt::g722, and ast_trans_pvt::pvt.

00084 {
00085    struct g722_decoder_pvt *tmp = pvt->pvt;
00086 
00087    g722_decode_init(&tmp->g722, 64000, G722_SAMPLE_RATE_8000);
00088 
00089    return 0;
00090 }

static int lin16tog722_new ( struct ast_trans_pvt * pvt ) [static]

Definition at line 73 of file codec_g722.c.

References g722_encoder_pvt::g722, and ast_trans_pvt::pvt.

00074 {
00075    struct g722_encoder_pvt *tmp = pvt->pvt;
00076 
00077    g722_encode_init(&tmp->g722, 64000, 0);
00078 
00079    return 0;
00080 }

static int lintog722_framein	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)			`[static]`

Definition at line 120 of file codec_g722.c.

References ast_frame::data, ast_trans_pvt::datalen, g722_encoder_pvt::g722, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, ast_frame::samples, and ast_trans_pvt::ui8.

00121 {
00122    struct g722_encoder_pvt *tmp = pvt->pvt;
00123    int outlen;
00124 
00125    outlen = g722_encode(&tmp->g722, (&pvt->outbuf.ui8[pvt->datalen]), 
00126       (int16_t *) f->data.ptr, f->samples);
00127 
00128    pvt->samples += outlen * 2;
00129 
00130    pvt->datalen += outlen;
00131 
00132    return 0;
00133 }

static int lintog722_new ( struct ast_trans_pvt * pvt ) [static]

init a new instance of g722_encoder_pvt.

Definition at line 64 of file codec_g722.c.

References g722_encoder_pvt::g722, and ast_trans_pvt::pvt.

00065 {
00066    struct g722_encoder_pvt *tmp = pvt->pvt;
00067 
00068    g722_encode_init(&tmp->g722, 64000, G722_SAMPLE_RATE_8000);
00069 
00070    return 0;
00071 }

static int load_module ( void ) [static]

Definition at line 223 of file codec_g722.c.

References AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, parse_config(), and unload_module.

00224 {
00225    int res = 0;
00226 
00227    if (parse_config(0))
00228       return AST_MODULE_LOAD_DECLINE;
00229 
00230    res |= ast_register_translator(&g722tolin);
00231    res |= ast_register_translator(&lintog722);
00232    res |= ast_register_translator(&g722tolin16);
00233    res |= ast_register_translator(&lin16tog722);
00234 
00235    if (res) {
00236       unload_module();
00237       return AST_MODULE_LOAD_FAILURE;
00238    }  
00239 
00240    return AST_MODULE_LOAD_SUCCESS;
00241 }

static int parse_config ( int reload ) [static]

Definition at line 185 of file codec_g722.c.

References ast_config_destroy(), ast_config_load, ast_true(), ast_variable_browse(), ast_verb, CONFIG_FLAG_FILEUNCHANGED, CONFIG_STATUS_FILEINVALID, CONFIG_STATUS_FILEMISSING, CONFIG_STATUS_FILEUNCHANGED, ast_variable::name, ast_variable::next, ast_translator::useplc, ast_variable::value, and var.

Referenced by load_module(), and reload().

00186 {
00187    struct ast_variable *var;
00188    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
00189    struct ast_config *cfg = ast_config_load("codecs.conf", config_flags);
00190 
00191    if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID)
00192       return 0;
00193    for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
00194       if (!strcasecmp(var->name, "genericplc")) {
00195          g722tolin.useplc = ast_true(var->value) ? 1 : 0;
00196          ast_verb(3, "codec_g722: %susing generic PLC\n",
00197                g722tolin.useplc ? "" : "not ");
00198       }
00199    }
00200    ast_config_destroy(cfg);
00201    return 0;
00202 }

static int reload ( void ) [static]

Definition at line 204 of file codec_g722.c.

References AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, and parse_config().

00205 {
00206    if (parse_config(1))
00207       return AST_MODULE_LOAD_DECLINE;
00208    return AST_MODULE_LOAD_SUCCESS;
00209 }

static int unload_module ( void ) [static]

Definition at line 211 of file codec_g722.c.

References ast_unregister_translator().

00212 {
00213    int res = 0;
00214 
00215    res |= ast_unregister_translator(&g722tolin);
00216    res |= ast_unregister_translator(&lintog722);
00217    res |= ast_unregister_translator(&g722tolin16);
00218    res |= ast_unregister_translator(&lin16tog722);
00219 
00220    return res;
00221 }

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "ITU G.722-64kbps G722 Transcoder" , .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 = "0901e4e500243c855563a2d78b0c03e4" , .load = load_module, .unload = unload_module, .reload = reload, } [static]

Definition at line 247 of file codec_g722.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 247 of file codec_g722.c.

struct ast_translator g722tolin [static]

Definition at line 135 of file codec_g722.c.

struct ast_translator g722tolin16 [static]

Definition at line 160 of file codec_g722.c.

struct ast_translator lin16tog722 [static]

Definition at line 173 of file codec_g722.c.

struct ast_translator lintog722 [static]

Definition at line 148 of file codec_g722.c.