codec_resample.c File Reference

Resample slinear audio. More...

#include "asterisk.h"
#include "speex/speex_resampler.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/slin.h"

Include dependency graph for codec_resample.c:

Go to the source code of this file.

Macros
#define	OUTBUF_SAMPLES   11520

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	load_module (void)
static void	resamp_destroy (struct ast_trans_pvt *pvt)
static int	resamp_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
static int	resamp_new (struct ast_trans_pvt *pvt)
static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "SLIN Resampling Codec" , .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_codec	codec_list []
static int	trans_size
static struct ast_translator *	translators

Detailed Description

Resample slinear audio.

Definition in file codec_resample.c.

Macro Definition Documentation

OUTBUF_SAMPLES

#define OUTBUF_SAMPLES   11520

Definition at line 39 of file codec_resample.c.

Referenced by load_module(), and resamp_framein().

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 189 of file codec_resample.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 189 of file codec_resample.c.

AST_MODULE_SELF_SYM()

struct ast_module* AST_MODULE_SELF_SYM

(

void

)

Definition at line 189 of file codec_resample.c.

load_module()

static int load_module ( void  )

static

Definition at line 149 of file codec_resample.c.

References ARRAY_LEN, ast_calloc, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, ast_translator::buf_size, ast_translator::buffer_samples, ast_translator::desc_size, ast_translator::destroy, ast_translator::dst_codec, ast_translator::framein, name, ast_translator::newpvt, OUTBUF_SAMPLES, resamp_destroy(), resamp_framein(), resamp_new(), ast_codec::sample_rate, trans_size, and unload_module().

{
   int res = 0;
   int x, y, idx = 0;

   trans_size = ARRAY_LEN(codec_list) * (ARRAY_LEN(codec_list) - 1);
   if (!(translators = ast_calloc(1, sizeof(struct ast_translator) * trans_size))) {
      return AST_MODULE_LOAD_DECLINE;
   }

   for (x = 0; x < ARRAY_LEN(codec_list); x++) {
      for (y = 0; y < ARRAY_LEN(codec_list); y++) {
         if (x == y) {
            continue;
         }
         translators[idx].newpvt = resamp_new;
         translators[idx].destroy = resamp_destroy;
         translators[idx].framein = resamp_framein;
         translators[idx].desc_size = 0;
         translators[idx].buffer_samples = OUTBUF_SAMPLES;
         translators[idx].buf_size = (OUTBUF_SAMPLES * sizeof(int16_t));
         memcpy(&translators[idx].src_codec, &codec_list[x], sizeof(struct ast_codec));
         memcpy(&translators[idx].dst_codec, &codec_list[y], sizeof(struct ast_codec));
         snprintf(translators[idx].name, sizeof(translators[idx].name), "slin %ukhz -> %ukhz",
            translators[idx].src_codec.sample_rate, translators[idx].dst_codec.sample_rate);
         res |= ast_register_translator(&translators[idx]);
         idx++;
      }

   }
   /* in case ast_register_translator() failed, we call unload_module() and
   ast_unregister_translator won't fail.*/
   if (res) {
      unload_module();
      return AST_MODULE_LOAD_DECLINE;
   }

   return AST_MODULE_LOAD_SUCCESS;
}

resamp_destroy()

static void resamp_destroy ( struct ast_trans_pvt *  pvt )

static

Definition at line 105 of file codec_resample.c.

References ast_trans_pvt::pvt, and speex_resampler_destroy().

Referenced by load_module().

{
   SpeexResamplerState *resamp_pvt = pvt->pvt;

   speex_resampler_destroy(resamp_pvt);
}

resamp_framein()

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

static

Definition at line 112 of file codec_resample.c.

References ast_frame::data, ast_frame::datalen, ast_trans_pvt::datalen, ast_trans_pvt::i16, ast_trans_pvt::outbuf, OUTBUF_SAMPLES, ast_frame::ptr, ast_trans_pvt::pvt, ast_trans_pvt::samples, and speex_resampler_process_int().

Referenced by load_module().

{
   SpeexResamplerState *resamp_pvt = pvt->pvt;
   unsigned int out_samples = OUTBUF_SAMPLES - pvt->samples;
   unsigned int in_samples;

   if (!f->datalen) {
      return -1;
   }
   in_samples = f->datalen / 2;

   speex_resampler_process_int(resamp_pvt,
      0,
      f->data.ptr,
      &in_samples,
      pvt->outbuf.i16 + pvt->samples,
      &out_samples);

   pvt->samples += out_samples;
   pvt->datalen += out_samples * 2;

   return 0;
}

resamp_new()

static int resamp_new ( struct ast_trans_pvt *  pvt )

static

Definition at line 91 of file codec_resample.c.

References ao2_bump, ast_assert, ast_format_cache_get_slin_by_rate(), ast_translator::dst_codec, ast_trans_pvt::f, ast_frame_subclass::format, NULL, ast_trans_pvt::pvt, ast_codec::sample_rate, speex_resampler_init(), ast_translator::src_codec, ast_frame::subclass, and ast_trans_pvt::t.

Referenced by load_module().

{
   int err;

   if (!(pvt->pvt = speex_resampler_init(1, pvt->t->src_codec.sample_rate, pvt->t->dst_codec.sample_rate, 5, &err))) {
      return -1;
   }

   ast_assert(pvt->f.subclass.format == NULL);
   pvt->f.subclass.format = ao2_bump(ast_format_cache_get_slin_by_rate(pvt->t->dst_codec.sample_rate));

   return 0;
}

unload_module()

static int unload_module ( void  )

static

Definition at line 136 of file codec_resample.c.

References ast_free, ast_unregister_translator(), and trans_size.

Referenced by load_module().

{
   int res = 0;
   int idx;

   for (idx = 0; idx < trans_size; idx++) {
      res |= ast_unregister_translator(&translators[idx]);
   }
   ast_free(translators);

   return res;
}

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "SLIN Resampling Codec" , .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 189 of file codec_resample.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 189 of file codec_resample.c.

codec_list

struct ast_codec codec_list[]

static

Definition at line 43 of file codec_resample.c.

Referenced by try_suggested_sip_codec().

trans_size

int trans_size

static

Definition at line 42 of file codec_resample.c.

Referenced by load_module(), and unload_module().

translators

struct ast_translator* translators

static

Definition at line 41 of file codec_resample.c.