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"
#include "asterisk/format_cache.h"

Include dependency graph for format_vox.c:

Go to the source code of this file.

Macros
#define	BUF_SIZE   80 /* 80 bytes, 160 samples */
#define	VOX_SAMPLES   160

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	load_module (void)
static int	unload_module (void)
static struct ast_frame *	vox_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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_EXTENDED, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format_def	vox_f

Detailed Description

Flat, binary, ADPCM vox file format.

• File name extensions: vox

Definition in file format_vox.c.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   80 /* 80 bytes, 160 samples */

Definition at line 38 of file format_vox.c.

VOX_SAMPLES

#define VOX_SAMPLES   160

Definition at line 39 of file format_vox.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 158 of file format_vox.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 158 of file format_vox.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 158 of file format_vox.c.

load_module()

static int load_module ( void  )

static

Definition at line 140 of file format_vox.c.

{
    vox_f.format = ast_format_adpcm;
    if (ast_format_def_register(&vox_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_adpcm, ast_format_def_register, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and vox_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 148 of file format_vox.c.

{
    return ast_format_def_unregister(vox_f.name);
}

References ast_format_def_unregister(), ast_format_def::name, and vox_f.

vox_read()

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

static

Definition at line 41 of file format_vox.c.

{
    size_t res;
 
    /* Send a frame from the file to the appropriate channel */
    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 of %s data (expected %d bytes, read %zu): %s\n",
                    ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
                    strerror(errno));
        }
        return NULL;
    }
    *whennext = s->fr.samples = res * 2;
    s->fr.datalen = res;
    return &s->fr;
}

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

vox_seek()

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

static

Definition at line 70 of file format_vox.c.

{
    off_t offset = 0, min = 0, cur, max, distance;
 
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    if (fseeko(fs->f, 0, SEEK_END) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    if ((max = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    /* have to fudge to frame here, so not fully to sample */
    distance = sample_offset/2;
    if (whence == SEEK_SET) {
        offset = distance;
    } else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
        offset = distance + cur;
    } else if (whence == SEEK_END) {
        offset = max - distance;
    }
    if (whence != SEEK_FORCECUR) {
        offset = (offset > max)?max:offset;
        offset = (offset < min)?min:offset;
    }
    return fseeko(fs->f, offset, SEEK_SET);
}

References ast_log, AST_LOG_WARNING, errno, ast_filestream::f, max, min, ast_frame::offset, and SEEK_FORCECUR.

vox_tell()

static off_t vox_tell ( struct ast_filestream *  fs )

static

Definition at line 121 of file format_vox.c.

{
     off_t offset;
     offset = ftello(fs->f) << 1;
     return offset;
}

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

vox_trunc()

static int vox_trunc ( struct ast_filestream *  fs )

static

Definition at line 105 of file format_vox.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for vox filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in vox filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    /* Truncate file to current length */
    return ftruncate(fd, cur);}

References ast_log, AST_LOG_WARNING, errno, and ast_filestream::f.

vox_write()

static int vox_write ( struct ast_filestream *  s, struct ast_frame *  f  )

static

Definition at line 60 of file format_vox.c.

{
    int res;
    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
            ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
            return -1;
    }
    return 0;
}

References ast_log, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, LOG_WARNING, and ast_frame::ptr.

Variable Documentation

__mod_info

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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_EXTENDED, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }

static

Definition at line 158 of file format_vox.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 158 of file format_vox.c.

vox_f

struct ast_format_def vox_f

static

Definition at line 128 of file format_vox.c.

Referenced by load_module(), and unload_module().