format_ilbc.c File Reference

Save to raw, headerless iLBC data. 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_ilbc.c:

Go to the source code of this file.

Macros
#define	ILBC_BUF_SIZE   50 /* One Real iLBC Frame */
#define	ILBC_SAMPLES   240

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static struct ast_frame *	ilbc_read (struct ast_filestream *s, int *whennext)
static int	ilbc_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	ilbc_tell (struct ast_filestream *fs)
static int	ilbc_trunc (struct ast_filestream *fs)
static int	ilbc_write (struct ast_filestream *fs, struct ast_frame *f)
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 = "Raw iLBC data" , .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	ilbc_f

Detailed Description

Save to raw, headerless iLBC data.

• File name extension: ilbc

Definition in file format_ilbc.c.

Macro Definition Documentation

ILBC_BUF_SIZE

#define ILBC_BUF_SIZE   50 /* One Real iLBC Frame */

Definition at line 43 of file format_ilbc.c.

Referenced by ilbc_read(), ilbc_seek(), and ilbc_tell().

ILBC_SAMPLES

#define ILBC_SAMPLES   240

Definition at line 44 of file format_ilbc.c.

Referenced by ilbc_read(), ilbc_seek(), and ilbc_tell().

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 156 of file format_ilbc.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 156 of file format_ilbc.c.

AST_MODULE_SELF_SYM()

struct ast_module* AST_MODULE_SELF_SYM

(

void

)

Definition at line 156 of file format_ilbc.c.

ilbc_read()

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

static

Definition at line 46 of file format_ilbc.c.

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, ILBC_BUF_SIZE, ILBC_SAMPLES, 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, ILBC_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 = ILBC_SAMPLES;
   return &s->fr;
}

ilbc_seek()

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

static

Definition at line 78 of file format_ilbc.c.

References ast_filestream::f, ILBC_BUF_SIZE, ILBC_SAMPLES, max, min, ast_frame::offset, and SEEK_FORCECUR.

{
   long bytes;
   off_t min,cur,max,offset=0;
   min = 0;
   cur = ftello(fs->f);
   fseeko(fs->f, 0, SEEK_END);
   max = ftello(fs->f);

   bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
   if (whence == SEEK_SET)
      offset = bytes;
   else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
      offset = cur + bytes;
   else if (whence == SEEK_END)
      offset = max - bytes;
   if (whence != SEEK_FORCECUR) {
      offset = (offset > max)?max:offset;
   }
   /* protect against seeking beyond begining. */
   offset = (offset < min)?min:offset;
   if (fseeko(fs->f, offset, SEEK_SET) < 0)
      return -1;
   return 0;
}

ilbc_tell()

static off_t ilbc_tell ( struct ast_filestream *  fs )

static

Definition at line 121 of file format_ilbc.c.

References ast_filestream::f, ILBC_BUF_SIZE, ILBC_SAMPLES, and ast_frame::offset.

{
   off_t offset = ftello(fs->f);
   return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES;
}

ilbc_trunc()

static int ilbc_trunc ( struct ast_filestream *  fs )

static

Definition at line 104 of file format_ilbc.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 iLBC 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 iLBC filestream %p: %s\n", fs, strerror(errno));
      return -1;
   }
   /* Truncate file to current length */
   return ftruncate(fd, cur);
}

ilbc_write()

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

static

Definition at line 64 of file format_ilbc.c.

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

{
   int res;
   if (f->datalen % 50) {
      ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
      return -1;
   }
   if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
         ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
         return -1;
   }
   return 0;
}

load_module()

static int load_module ( void  )

static

Definition at line 138 of file format_ilbc.c.

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

Referenced by unload_module().

{
   ilbc_f.format = ast_format_ilbc;
   if (ast_format_def_register(&ilbc_f))
      return AST_MODULE_LOAD_DECLINE;
   return AST_MODULE_LOAD_SUCCESS;
}

unload_module()

static int unload_module ( void  )

static

Definition at line 146 of file format_ilbc.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(ilbc_f.name);
}

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw iLBC data" , .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 156 of file format_ilbc.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 156 of file format_ilbc.c.

ilbc_f

struct ast_format_def ilbc_f

static

Definition at line 127 of file format_ilbc.c.