format_siren14.c File Reference

ITU G.722.1 Annex C (Siren14, licensed from Polycom) format, 48kbps bitrate only. More...

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

Include dependency graph for format_siren14.c:

Go to the source code of this file.

Macros
#define	BUF_SIZE   120 /* 20 milliseconds == 120 bytes, 640 samples */
#define	BYTES_TO_SAMPLES(x)   ((typeof(x)) x * ((float) 640 / 120))
#define	SAMPLES_TO_BYTES(x)   ((typeof(x)) x / ((float) 640 / 120))

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 struct ast_frame *	siren14read (struct ast_filestream *s, int *whennext)
static int	siren14seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	siren14tell (struct ast_filestream *fs)
static int	siren14trunc (struct ast_filestream *fs)
static int	siren14write (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 = "ITU G.722.1 Annex C (Siren14, licensed from Polycom)" , .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" , .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format_def	siren14_f

Detailed Description

ITU G.722.1 Annex C (Siren14, licensed from Polycom) format, 48kbps bitrate only.

• File name extensions: siren14

Definition in file format_siren14.c.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   120 /* 20 milliseconds == 120 bytes, 640 samples */

Definition at line 37 of file format_siren14.c.

Referenced by siren14read().

BYTES_TO_SAMPLES

#define BYTES_TO_SAMPLES

(

x

)

((typeof(x)) x * ((float) 640 / 120))

Definition at line 39 of file format_siren14.c.

Referenced by siren14read(), and siren14tell().

SAMPLES_TO_BYTES

#define SAMPLES_TO_BYTES

(

x

)

((typeof(x)) x / ((float) 640 / 120))

Definition at line 38 of file format_siren14.c.

Referenced by siren14seek().

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 159 of file format_siren14.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 159 of file format_siren14.c.

AST_MODULE_SELF_SYM()

struct ast_module* AST_MODULE_SELF_SYM

(

void

)

Definition at line 159 of file format_siren14.c.

load_module()

static int load_module ( void  )

static

Definition at line 140 of file format_siren14.c.

References ast_format_def_register, ast_format_siren14, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, and ast_format_def::format.

Referenced by unload_module().

{
   siren14_f.format = ast_format_siren14;
   if (ast_format_def_register(&siren14_f))
      return AST_MODULE_LOAD_DECLINE;

   return AST_MODULE_LOAD_SUCCESS;
}

siren14read()

static struct ast_frame* siren14read ( struct ast_filestream *  s, int *  whennext  )

static

Definition at line 41 of file format_siren14.c.

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, BUF_SIZE, BYTES_TO_SAMPLES, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

{
   size_t res;

   /* Send a frame from the file to the appropriate channel */
   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)) != s->fr.datalen) {
      if (res) {
         ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
               ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
               strerror(errno));
      }
      return NULL;
   }
   *whennext = s->fr.samples = BYTES_TO_SAMPLES(res);
   return &s->fr;
}

siren14seek()

static int siren14seek ( struct ast_filestream *  fs, off_t  sample_offset, int  whence  )

static

Definition at line 70 of file format_siren14.c.

References ast_log, AST_LOG_WARNING, errno, ast_filestream::f, max, min, ast_frame::offset, SAMPLES_TO_BYTES, and SEEK_FORCECUR.

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

   sample_offset = SAMPLES_TO_BYTES(sample_offset);

   if ((cur = ftello(fs->f)) < 0) {
      ast_log(AST_LOG_WARNING, "Unable to determine current position in siren14 filestream %p: %s\n", fs, strerror(errno));
      return -1;
   }

   if (fseeko(fs->f, 0, SEEK_END) < 0) {
      ast_log(AST_LOG_WARNING, "Unable to seek to end of siren14 filestream %p: %s\n", fs, strerror(errno));
      return -1;
   }

   if ((max = ftello(fs->f)) < 0) {
      ast_log(AST_LOG_WARNING, "Unable to determine max position in siren14 filestream %p: %s\n", fs, strerror(errno));
      return -1;
   }

   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);
}

siren14tell()

static off_t siren14tell ( struct ast_filestream *  fs )

static

Definition at line 124 of file format_siren14.c.

References BYTES_TO_SAMPLES, and ast_filestream::f.

{
   return BYTES_TO_SAMPLES(ftello(fs->f));
}

siren14trunc()

static int siren14trunc ( struct ast_filestream *  fs )

static

Definition at line 107 of file format_siren14.c.

References ast_log, AST_LOG_WARNING, errno, and ast_filestream::f.

{
   int fd;
   off_t cur;

   if ((fd = fileno(fs->f)) < 0) {
      ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for siren14 filestream %p: %s\n", fs, strerror(errno));
      return -1;
   }
   if ((cur = ftello(fs->f)) < 0) {
      ast_log(AST_LOG_WARNING, "Unable to determine current position in siren14 filestream %p: %s\n", fs, strerror(errno));
      return -1;
   }
   /* Truncate file to current length */
   return ftruncate(fd, cur);
}

siren14write()

static int siren14write ( struct ast_filestream *  fs, struct ast_frame *  f  )

static

Definition at line 59 of file format_siren14.c.

References ast_log, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, LOG_WARNING, and ast_frame::ptr.

{
   int res;

   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;
}

unload_module()

static int unload_module ( void  )

static

Definition at line 149 of file format_siren14.c.

References ast_format_def_unregister(), AST_MODFLAG_LOAD_ORDER, AST_MODPRI_APP_DEPEND, AST_MODULE_INFO(), AST_MODULE_SUPPORT_CORE, ASTERISK_GPL_KEY, load_module(), and ast_format_def::name.

{
   return ast_format_def_unregister(siren14_f.name);
}

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "ITU G.722.1 Annex C (Siren14, licensed from Polycom)" , .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" , .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }

static

Definition at line 159 of file format_siren14.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 159 of file format_siren14.c.

siren14_f

struct ast_format_def siren14_f

static

Definition at line 129 of file format_siren14.c.