Mon Nov 24 15:34:37 2008

Asterisk developer's documentation


format_vox.c File Reference

Flat, binary, ADPCM vox file format. More...

#include "asterisk.h"
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/sched.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"

Go to the source code of this file.

Defines

#define BUF_SIZE   80
#define VOX_SAMPLES   160

Functions

 AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Dialogic VOX (ADPCM) File Format")
static int load_module (void)
static int unload_module (void)
static struct ast_framevox_read (struct ast_filestream *s, int *whennext)
static int vox_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t vox_tell (struct ast_filestream *fs)
static int vox_trunc (struct ast_filestream *fs)
static int vox_write (struct ast_filestream *s, struct ast_frame *f)

Variables

static struct ast_format vox_f


Detailed Description

Flat, binary, ADPCM vox file format.

Definition in file format_vox.c.


Define Documentation

#define BUF_SIZE   80

Definition at line 48 of file format_vox.c.

#define VOX_SAMPLES   160

Definition at line 49 of file format_vox.c.


Function Documentation

AST_MODULE_INFO_STANDARD ( ASTERISK_GPL_KEY  ,
"Dialogic VOX (ADPCM) File Format"   
)

static int load_module ( void   )  [static]

Definition at line 136 of file format_vox.c.

References ast_format_register, and vox_f.

00137 {
00138    return ast_format_register(&vox_f);
00139 }

static int unload_module ( void   )  [static]

Definition at line 141 of file format_vox.c.

References ast_format_unregister(), ast_format::name, and vox_f.

00142 {
00143    return ast_format_unregister(vox_f.name);
00144 }  

static struct ast_frame* vox_read ( struct ast_filestream s,
int *  whennext 
) [static]

Definition at line 51 of file format_vox.c.

References AST_FORMAT_ADPCM, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), BUF_SIZE, errno, LOG_WARNING, and s.

00052 {
00053    int res;
00054 
00055    /* Send a frame from the file to the appropriate channel */
00056    s->fr.frametype = AST_FRAME_VOICE;
00057    s->fr.subclass = AST_FORMAT_ADPCM;
00058    s->fr.mallocd = 0;
00059    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00060    if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
00061       if (res)
00062          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00063       return NULL;
00064    }
00065    *whennext = s->fr.samples = res * 2;
00066    s->fr.datalen = res;
00067    return &s->fr;
00068 }

static int vox_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 88 of file format_vox.c.

References ast_filestream::f, offset, and SEEK_FORCECUR.

00089 {
00090      off_t offset=0,min,cur,max,distance;
00091    
00092      min = 0;
00093      cur = ftello(fs->f);
00094      fseeko(fs->f, 0, SEEK_END);
00095     max = ftello(fs->f);
00096     
00097      /* have to fudge to frame here, so not fully to sample */
00098      distance = sample_offset/2;
00099      if(whence == SEEK_SET)
00100      offset = distance;
00101      else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
00102      offset = distance + cur;
00103      else if(whence == SEEK_END)
00104      offset = max - distance;
00105      if (whence != SEEK_FORCECUR) {
00106      offset = (offset > max)?max:offset;
00107      offset = (offset < min)?min:offset;
00108      }
00109      return fseeko(fs->f, offset, SEEK_SET);
00110 }

static off_t vox_tell ( struct ast_filestream fs  )  [static]

Definition at line 117 of file format_vox.c.

References ast_filestream::f, and offset.

00118 {
00119      off_t offset;
00120      offset = ftello(fs->f) << 1;
00121      return offset; 
00122 }

static int vox_trunc ( struct ast_filestream fs  )  [static]

Definition at line 112 of file format_vox.c.

References ast_filestream::f.

00113 {
00114      return ftruncate(fileno(fs->f), ftello(fs->f));
00115 }

static int vox_write ( struct ast_filestream s,
struct ast_frame f 
) [static]

Definition at line 70 of file format_vox.c.

References AST_FORMAT_ADPCM, AST_FRAME_VOICE, ast_log(), errno, f, LOG_WARNING, and s.

00071 {
00072    int res;
00073    if (f->frametype != AST_FRAME_VOICE) {
00074       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00075       return -1;
00076    }
00077    if (f->subclass != AST_FORMAT_ADPCM) {
00078       ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%d)!\n", f->subclass);
00079       return -1;
00080    }
00081    if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
00082          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00083          return -1;
00084    }
00085    return 0;
00086 }


Variable Documentation

struct ast_format vox_f [static]

Definition at line 124 of file format_vox.c.

Referenced by load_module(), and unload_module().


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