Sat Aug 6 00:39:56 2011

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

static void __reg_module (void)
static void __unreg_module (void)
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_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "Dialogic VOX (ADPCM) File Format" , .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, }
static const struct ast_module_infoast_module_info = &__mod_info
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

static void __reg_module ( void   )  [static]

Definition at line 149 of file format_vox.c.

static void __unreg_module ( void   )  [static]

Definition at line 149 of file format_vox.c.

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_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "Dialogic VOX (ADPCM) File Format" , .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, } [static]

Definition at line 149 of file format_vox.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 149 of file format_vox.c.

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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