Thu Jul 9 13:41:19 2009

Asterisk developer's documentation


format_vox.c File Reference

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

#include "asterisk.h"
#include "asterisk/mod_format.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_DEFAULT , .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 = "068e67f60f50dd9ee86464c05884a49d" , .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 35 of file format_vox.c.

#define VOX_SAMPLES   160

Definition at line 36 of file format_vox.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 135 of file format_vox.c.

static void __unreg_module ( void   )  [static]

Definition at line 135 of file format_vox.c.

static int load_module ( void   )  [static]

Definition at line 123 of file format_vox.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and vox_f.

00124 {
00125    if (ast_format_register(&vox_f))
00126       return AST_MODULE_LOAD_FAILURE;
00127    return AST_MODULE_LOAD_SUCCESS;
00128 }

static int unload_module ( void   )  [static]

Definition at line 130 of file format_vox.c.

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

00131 {
00132    return ast_format_unregister(vox_f.name);
00133 }  

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

Definition at line 38 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.

00039 {
00040    int res;
00041 
00042    /* Send a frame from the file to the appropriate channel */
00043    s->fr.frametype = AST_FRAME_VOICE;
00044    s->fr.subclass = AST_FORMAT_ADPCM;
00045    s->fr.mallocd = 0;
00046    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00047    if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) < 1) {
00048       if (res)
00049          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00050       return NULL;
00051    }
00052    *whennext = s->fr.samples = res * 2;
00053    s->fr.datalen = res;
00054    return &s->fr;
00055 }

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

Definition at line 75 of file format_vox.c.

References ast_filestream::f, ast_frame::offset, and SEEK_FORCECUR.

00076 {
00077      off_t offset=0,min,cur,max,distance;
00078    
00079      min = 0;
00080      cur = ftello(fs->f);
00081      fseeko(fs->f, 0, SEEK_END);
00082     max = ftello(fs->f);
00083     
00084      /* have to fudge to frame here, so not fully to sample */
00085      distance = sample_offset/2;
00086      if(whence == SEEK_SET)
00087      offset = distance;
00088      else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
00089      offset = distance + cur;
00090      else if(whence == SEEK_END)
00091      offset = max - distance;
00092      if (whence != SEEK_FORCECUR) {
00093      offset = (offset > max)?max:offset;
00094      offset = (offset < min)?min:offset;
00095      }
00096      return fseeko(fs->f, offset, SEEK_SET);
00097 }

static off_t vox_tell ( struct ast_filestream fs  )  [static]

Definition at line 104 of file format_vox.c.

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

00105 {
00106      off_t offset;
00107      offset = ftello(fs->f) << 1;
00108      return offset; 
00109 }

static int vox_trunc ( struct ast_filestream fs  )  [static]

Definition at line 99 of file format_vox.c.

References ast_filestream::f.

00100 {
00101      return ftruncate(fileno(fs->f), ftello(fs->f));
00102 }

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

Definition at line 57 of file format_vox.c.

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

00058 {
00059    int res;
00060    if (f->frametype != AST_FRAME_VOICE) {
00061       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00062       return -1;
00063    }
00064    if (f->subclass != AST_FORMAT_ADPCM) {
00065       ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%d)!\n", f->subclass);
00066       return -1;
00067    }
00068    if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
00069          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00070          return -1;
00071    }
00072    return 0;
00073 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .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 = "068e67f60f50dd9ee86464c05884a49d" , .load = load_module, .unload = unload_module, } [static]

Definition at line 135 of file format_vox.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 135 of file format_vox.c.

struct ast_format vox_f [static]

Definition at line 111 of file format_vox.c.

Referenced by load_module(), and unload_module().


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