codec_codec2.c File Reference

Translate between signed linear and Codec 2. More...

#include "asterisk.h"
#include "asterisk/codec.h"
#include "asterisk/frame.h"
#include "asterisk/linkedlists.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/translate.h"
#include <codec2/codec2.h>
#include "asterisk/slin.h"
#include "ex_codec2.h"

Include dependency graph for codec_codec2.c:

Go to the source code of this file.

Data Structures
struct	codec2_translator_pvt

Macros
#define	BUFFER_SAMPLES   8000
#define	CODEC2_FRAME_LEN   6 /* consider codec2_bits_per_frame(.) */
#define	CODEC2_SAMPLES   160 /* consider codec2_samples_per_frame(.) */

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static void	codec2_destroy_stuff (struct ast_trans_pvt *pvt)
static int	codec2_new (struct ast_trans_pvt *pvt)
static int	codec2tolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
	decode and store in outbuf. More...
static int	lintocodec2_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
	store samples into working buffer for later decode More...
static struct ast_frame *	lintocodec2_frameout (struct ast_trans_pvt *pvt)
	encode and produce a frame More...
static int	load_module (void)
static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Codec 2 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 = "30ef0c93b36035ec78c9cfd712d36d9b" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_translator	codec2tolin
static struct ast_translator	lintocodec2

Detailed Description

Translate between signed linear and Codec 2.

Author

Alexander Traud pabst.nosp@m.raud.nosp@m.@comp.nosp@m.user.nosp@m.ve.co.nosp@m.m

Note

http://www.rowetel.com/codec2.html

Definition in file codec_codec2.c.

Macro Definition Documentation

BUFFER_SAMPLES

#define BUFFER_SAMPLES   8000

Definition at line 47 of file codec_codec2.c.

CODEC2_FRAME_LEN

#define CODEC2_FRAME_LEN   6 /* consider codec2_bits_per_frame(.) */

Definition at line 49 of file codec_codec2.c.

Referenced by codec2tolin_framein(), and lintocodec2_frameout().

CODEC2_SAMPLES

#define CODEC2_SAMPLES   160 /* consider codec2_samples_per_frame(.) */

Definition at line 48 of file codec_codec2.c.

Referenced by codec2_sample(), codec2tolin_framein(), and lintocodec2_frameout().

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 222 of file codec_codec2.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 222 of file codec_codec2.c.

AST_MODULE_SELF_SYM()

struct ast_module* AST_MODULE_SELF_SYM

(

void

)

Definition at line 222 of file codec_codec2.c.

codec2_destroy_stuff()

static void codec2_destroy_stuff ( struct ast_trans_pvt *  pvt )

static

Definition at line 141 of file codec_codec2.c.

References ast_trans_pvt::pvt, codec2_translator_pvt::state, and tmp().

{
   struct codec2_translator_pvt *tmp = pvt->pvt;

   if (tmp->state) {
      codec2_destroy(tmp->state);
   }
}

codec2_new()

static int codec2_new ( struct ast_trans_pvt *  pvt )

static

Definition at line 60 of file codec_codec2.c.

References ast_log, LOG_ERROR, ast_trans_pvt::pvt, codec2_translator_pvt::state, and tmp().

{
   struct codec2_translator_pvt *tmp = pvt->pvt;

   tmp->state = codec2_create(CODEC2_MODE_2400);

   if (!tmp->state) {
      ast_log(LOG_ERROR, "Error creating Codec 2 conversion\n");
      return -1;
   }

   return 0;
}

codec2tolin_framein()

static int codec2tolin_framein ( struct ast_trans_pvt *  pvt, struct ast_frame *  f  )

static

decode and store in outbuf.

Definition at line 75 of file codec_codec2.c.

References CODEC2_FRAME_LEN, CODEC2_SAMPLES, ast_frame::data, ast_frame::datalen, ast_trans_pvt::datalen, ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, codec2_translator_pvt::state, and tmp().

{
   struct codec2_translator_pvt *tmp = pvt->pvt;
   int x;

   for (x = 0; x < f->datalen; x += CODEC2_FRAME_LEN) {
      unsigned char *src = f->data.ptr + x;
      int16_t *dst = pvt->outbuf.i16 + pvt->samples;

      codec2_decode(tmp->state, dst, src);

      pvt->samples += CODEC2_SAMPLES;
      pvt->datalen += CODEC2_SAMPLES * 2;
   }

   return 0;
}

lintocodec2_framein()

static int lintocodec2_framein ( struct ast_trans_pvt *  pvt, struct ast_frame *  f  )

static

store samples into working buffer for later decode

Definition at line 94 of file codec_codec2.c.

References codec2_translator_pvt::buf, ast_frame::data, ast_frame::datalen, ast_frame::ptr, ast_trans_pvt::pvt, ast_frame::samples, ast_trans_pvt::samples, and tmp().

{
   struct codec2_translator_pvt *tmp = pvt->pvt;

   memcpy(tmp->buf + pvt->samples, f->data.ptr, f->datalen);
   pvt->samples += f->samples;

   return 0;
}

lintocodec2_frameout()

static struct ast_frame* lintocodec2_frameout ( struct ast_trans_pvt *  pvt )

static

encode and produce a frame

Definition at line 105 of file codec_codec2.c.

References AST_LIST_NEXT, ast_trans_frameout(), codec2_translator_pvt::buf, CODEC2_FRAME_LEN, CODEC2_SAMPLES, last, NULL, ast_trans_pvt::outbuf, ast_trans_pvt::pvt, result, ast_frame::samples, ast_trans_pvt::samples, codec2_translator_pvt::state, tmp(), and ast_trans_pvt::uc.

{
   struct codec2_translator_pvt *tmp = pvt->pvt;
   struct ast_frame *result = NULL;
   struct ast_frame *last = NULL;
   int samples = 0; /* output samples */

   while (pvt->samples >= CODEC2_SAMPLES) {
      struct ast_frame *current;

      /* Encode a frame of data */
      codec2_encode(tmp->state, pvt->outbuf.uc, tmp->buf + samples);

      samples += CODEC2_SAMPLES;
      pvt->samples -= CODEC2_SAMPLES;

      current = ast_trans_frameout(pvt, CODEC2_FRAME_LEN, CODEC2_SAMPLES);

      if (!current) {
         continue;
      } else if (last) {
         AST_LIST_NEXT(last, frame_list) = current;
      } else {
         result = current;
      }
      last = current;
   }

   /* Move the data at the end of the buffer to the front */
   if (samples) {
      memmove(tmp->buf, tmp->buf + samples, pvt->samples * 2);
   }

   return result;
}

load_module()

static int load_module ( void  )

static

Definition at line 206 of file codec_codec2.c.

References ast_format_codec2, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, ast_rtp_engine_load_format(), and unload_module().

{
   int res = 0;

   res |= ast_register_translator(&codec2tolin);
   res |= ast_register_translator(&lintocodec2);
   res |= ast_rtp_engine_load_format(ast_format_codec2);

   if (res) {
      unload_module();
      return AST_MODULE_LOAD_DECLINE;
   }

   return AST_MODULE_LOAD_SUCCESS;
}

unload_module()

static int unload_module ( void  )

static

Definition at line 195 of file codec_codec2.c.

References ast_format_codec2, ast_rtp_engine_unload_format(), and ast_unregister_translator().

Referenced by load_module().

{
   int res = 0;

   res |= ast_rtp_engine_unload_format(ast_format_codec2);
   res |= ast_unregister_translator(&lintocodec2);
   res |= ast_unregister_translator(&codec2tolin);

   return res;
}

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Codec 2 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 = "30ef0c93b36035ec78c9cfd712d36d9b" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }

static

Definition at line 222 of file codec_codec2.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 222 of file codec_codec2.c.

codec2tolin

struct ast_translator codec2tolin

static

Definition at line 150 of file codec_codec2.c.

lintocodec2

struct ast_translator lintocodec2

static

Definition at line 172 of file codec_codec2.c.