Thu Apr 28 2011 17:13:55

Asterisk developer's documentation

Defines | Functions | Variables

format_sln.c File Reference
Module: Media File Formats

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
__MODULE_INFO_SECTION 		__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw Signed Linear Audio support (SLN)" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, }
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 33 of file format_sln.c.

Referenced by slinear_read().

#define SLIN_SAMPLES   160

Definition at line 34 of file format_sln.c.

Function Documentation

static void __reg_module ( void  ) [static]

Definition at line 134 of file format_sln.c.

static void __unreg_module ( void  ) [static]

Definition at line 134 of file format_sln.c.

static int load_module ( void  ) [static]

Definition at line 118 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 36 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::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 = 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 73 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 101 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 96 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 55 of file format_sln.c.

References AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_log(), ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, fwrite, 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 != AST_FORMAT_SLINEAR) {
      ast_log(LOG_WARNING, "Asked to write non-slinear frame (%d)!\n", f->subclass);
      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 125 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 __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw Signed Linear Audio support (SLN)" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, } [static]

Definition at line 134 of file format_sln.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 134 of file format_sln.c.

struct ast_format slin_f [static]

Definition at line 106 of file format_sln.c.