RAW SLINEAR Format. More...

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

Include dependency graph for format_sln.c:

Go to the source code of this file.

Defines
#define	BUF_SIZE 320
#define	SLIN_SAMPLES 160
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 Audio support (SLN)" , .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 Format.

File name extensions: sln, raw

Definition in file format_sln.c.

Define Documentation

#define BUF_SIZE 320

Definition at line 37 of file format_sln.c.

Referenced by slinear_read().

#define SLIN_SAMPLES 160

Definition at line 38 of file format_sln.c.

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 138 of file format_sln.c.

static void __unreg_module ( void ) [static]

Definition at line 138 of file format_sln.c.

static int load_module ( void ) [static]

Definition at line 122 of file format_sln.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 40 of file format_sln.c.

References AST_FORMAT_SLINEAR, 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_SLINEAR;
   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 77 of file format_sln.c.

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

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

   min = 0;
   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 105 of file format_sln.c.

References ast_filestream::f.

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

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

Definition at line 100 of file format_sln.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 59 of file format_sln.c.

References AST_FORMAT_SLINEAR, 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_SLINEAR) {
      ast_log(LOG_WARNING, "Asked to write non-slinear 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 129 of file format_sln.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 Audio support (SLN)" , .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 138 of file format_sln.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 138 of file format_sln.c.

struct ast_format slin_f [static]

Definition at line 110 of file format_sln.c.

Asterisk developer's documentation

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation