Sat Mar 10 01:55:24 2012

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_LOAD_ORDER , .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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static 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 39 of file format_vox.c.

#define VOX_SAMPLES   160

Definition at line 40 of file format_vox.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 143 of file format_vox.c.

static void __unreg_module ( void   )  [static]

Definition at line 143 of file format_vox.c.

static int load_module ( void   )  [static]

Definition at line 127 of file format_vox.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and vox_f.

00128 {
00129    if (ast_format_register(&vox_f))
00130       return AST_MODULE_LOAD_FAILURE;
00131    return AST_MODULE_LOAD_SUCCESS;
00132 }

static int unload_module ( void   )  [static]

Definition at line 134 of file format_vox.c.

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

00135 {
00136    return ast_format_unregister(vox_f.name);
00137 }

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

Definition at line 42 of file format_vox.c.

References AST_FORMAT_ADPCM, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, 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.

00043 {
00044    int res;
00045 
00046    /* Send a frame from the file to the appropriate channel */
00047    s->fr.frametype = AST_FRAME_VOICE;
00048    s->fr.subclass.codec = AST_FORMAT_ADPCM;
00049    s->fr.mallocd = 0;
00050    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00051    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
00052       if (res)
00053          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00054       return NULL;
00055    }
00056    *whennext = s->fr.samples = res * 2;
00057    s->fr.datalen = res;
00058    return &s->fr;
00059 }

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

Definition at line 79 of file format_vox.c.

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

00080 {
00081      off_t offset=0,min,cur,max,distance;
00082    
00083      min = 0;
00084      cur = ftello(fs->f);
00085      fseeko(fs->f, 0, SEEK_END);
00086     max = ftello(fs->f);
00087     
00088      /* have to fudge to frame here, so not fully to sample */
00089      distance = sample_offset/2;
00090      if(whence == SEEK_SET)
00091      offset = distance;
00092      else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
00093      offset = distance + cur;
00094      else if(whence == SEEK_END)
00095      offset = max - distance;
00096      if (whence != SEEK_FORCECUR) {
00097      offset = (offset > max)?max:offset;
00098      offset = (offset < min)?min:offset;
00099      }
00100      return fseeko(fs->f, offset, SEEK_SET);
00101 }

static off_t vox_tell ( struct ast_filestream fs  )  [static]

Definition at line 108 of file format_vox.c.

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

00109 {
00110      off_t offset;
00111      offset = ftello(fs->f) << 1;
00112      return offset; 
00113 }

static int vox_trunc ( struct ast_filestream fs  )  [static]

Definition at line 103 of file format_vox.c.

References ast_filestream::f.

00104 {
00105      return ftruncate(fileno(fs->f), ftello(fs->f));
00106 }

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

Definition at line 61 of file format_vox.c.

References AST_FORMAT_ADPCM, AST_FRAME_VOICE, ast_getformatname(), ast_log(), errno, ast_filestream::f, f, and LOG_WARNING.

00062 {
00063    int res;
00064    if (f->frametype != AST_FRAME_VOICE) {
00065       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00066       return -1;
00067    }
00068    if (f->subclass.codec != AST_FORMAT_ADPCM) {
00069       ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%s)!\n", ast_getformatname(f->subclass.codec));
00070       return -1;
00071    }
00072    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00073          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00074          return -1;
00075    }
00076    return 0;
00077 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 143 of file format_vox.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 143 of file format_vox.c.

struct ast_format vox_f [static]

Definition at line 115 of file format_vox.c.

Referenced by load_module(), and unload_module().


Generated on Sat Mar 10 01:55:24 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7