RAW SLINEAR 16 Format. More...

#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"

Include dependency graph for format_sln16.c:

Go to the source code of this file.

Defines
#define	BUF_SIZE 640
#define	SLIN_SAMPLES 320
Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	load_module (void)
static struct ast_frame *	slinear_read (struct ast_filestream s, int whennext)
static int	slinear_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	slinear_tell (struct ast_filestream *fs)
static int	slinear_trunc (struct ast_filestream *fs)
static int	slinear_write (struct ast_filestream fs, struct ast_frame f)
static int	unload_module (void)
Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw Signed Linear 16KHz Audio support (SLN16)" , .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, .load_pri = AST_MODPRI_APP_DEPEND }
static struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format	slin_f

Detailed Description

RAW SLINEAR 16 Format.

File name extensions: sln16

Definition in file format_sln16.c.

Define Documentation

#define BUF_SIZE 640

Definition at line 38 of file format_sln16.c.

Referenced by slinear_read().

#define SLIN_SAMPLES 320

Definition at line 39 of file format_sln16.c.

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 146 of file format_sln16.c.

static void __unreg_module ( void ) [static]

Definition at line 146 of file format_sln16.c.

static int load_module ( void ) [static]

Definition at line 129 of file format_sln16.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

{
   if (ast_format_register(&slin_f))
      return AST_MODULE_LOAD_FAILURE;

   return AST_MODULE_LOAD_SUCCESS;
}

static struct ast_frame* slinear_read	(	struct ast_filestream *	s,
		int *	whennext
	)		`[static, read]`

Definition at line 41 of file format_sln16.c.

References AST_FORMAT_SLINEAR16, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

{
   int res;
   /* Send a frame from the file to the appropriate channel */

   s->fr.frametype = AST_FRAME_VOICE;
   s->fr.subclass.codec = AST_FORMAT_SLINEAR16;
   s->fr.mallocd = 0;
   AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
   if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
      if (res)
         ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
      return NULL;
   }
   *whennext = s->fr.samples = res/2;
   s->fr.datalen = res;
   return &s->fr;
}

static int slinear_seek	(	struct ast_filestream *	fs,
		off_t	sample_offset,
		int	whence
	)		`[static]`

Definition at line 79 of file format_sln16.c.

References ast_filestream::f, ast_frame::offset, and SEEK_FORCECUR.

{
   off_t offset = 0, min = 0, cur, max;

   sample_offset <<= 1;

   cur = ftello(fs->f);

   fseeko(fs->f, 0, SEEK_END);

   max = ftello(fs->f);

   if (whence == SEEK_SET)
      offset = sample_offset;
   else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
      offset = sample_offset + cur;
   else if (whence == SEEK_END)
      offset = max - sample_offset;

   if (whence != SEEK_FORCECUR)
      offset = (offset > max) ? max : offset;

   /* always protect against seeking past begining. */
   offset = (offset < min) ? min : offset;

   return fseeko(fs->f, offset, SEEK_SET);
}

static off_t slinear_tell ( struct ast_filestream * fs ) [static]

Definition at line 112 of file format_sln16.c.

References ast_filestream::f.

{
   return ftello(fs->f) / 2;
}

static int slinear_trunc ( struct ast_filestream * fs ) [static]

Definition at line 107 of file format_sln16.c.

References ast_filestream::f.

{
   return ftruncate(fileno(fs->f), ftello(fs->f));
}

static int slinear_write	(	struct ast_filestream *	fs,
		struct ast_frame *	f
	)		`[static]`

Definition at line 60 of file format_sln16.c.

References AST_FORMAT_SLINEAR16, AST_FRAME_VOICE, ast_getformatname(), ast_log(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

{
   int res;

   if (f->frametype != AST_FRAME_VOICE) {
      ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
      return -1;
   }
   if (f->subclass.codec != AST_FORMAT_SLINEAR16) {
      ast_log(LOG_WARNING, "Asked to write non-slinear16 frame (%s)!\n", ast_getformatname(f->subclass.codec));
      return -1;
   }
   if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
      ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
      return -1;
   }
   return 0;
}

static int unload_module ( void ) [static]

Definition at line 137 of file format_sln16.c.

References ast_format_unregister(), and ast_format::name.

{
   return ast_format_unregister(slin_f.name);
}

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw Signed Linear 16KHz Audio support (SLN16)" , .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, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 146 of file format_sln16.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 146 of file format_sln16.c.

struct ast_format slin_f [static]

Definition at line 117 of file format_sln16.c.

Asterisk developer's documentation

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation