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.

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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_EXTENDED, .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_def 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 40 of file format_vox.c.

#define VOX_SAMPLES   160

Definition at line 41 of file format_vox.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 156 of file format_vox.c.

static void __unreg_module ( void   )  [static]

Definition at line 156 of file format_vox.c.

static int load_module ( void   )  [static]

static int unload_module ( void   )  [static]

Definition at line 146 of file format_vox.c.

References ast_format_def_unregister(), and ast_format_def::name.

00147 {
00148    return ast_format_def_unregister(vox_f.name);
00149 }

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

Definition at line 43 of file format_vox.c.

References 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_filestream::fr, LOG_WARNING, NULL, ast_frame::ptr, and ast_frame::samples.

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

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

Definition at line 69 of file format_vox.c.

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

00070 {
00071    off_t offset = 0, min = 0, cur, max, distance;
00072 
00073    if ((cur = ftello(fs->f)) < 0) {
00074       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00075       return -1;
00076    }
00077 
00078    if (fseeko(fs->f, 0, SEEK_END) < 0) {
00079       ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
00080       return -1;
00081    }
00082 
00083    if ((max = ftello(fs->f)) < 0) {
00084       ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
00085       return -1;
00086    }
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    }
00097    if (whence != SEEK_FORCECUR) {
00098       offset = (offset > max)?max:offset;
00099       offset = (offset < min)?min:offset;
00100    }
00101    return fseeko(fs->f, offset, SEEK_SET);
00102 }

static off_t vox_tell ( struct ast_filestream fs  )  [static]

Definition at line 120 of file format_vox.c.

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

00121 {
00122      off_t offset;
00123      offset = ftello(fs->f) << 1;
00124      return offset; 
00125 }

static int vox_trunc ( struct ast_filestream fs  )  [static]

Definition at line 104 of file format_vox.c.

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

00105 {
00106    int fd;
00107    off_t cur;
00108 
00109    if ((fd = fileno(fs->f)) < 0) {
00110       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for vox filestream %p: %s\n", fs, strerror(errno));
00111       return -1;
00112    }
00113    if ((cur = ftello(fs->f)) < 0) {
00114       ast_log(AST_LOG_WARNING, "Unable to determine current position in vox filestream %p: %s\n", fs, strerror(errno));
00115       return -1;
00116    }
00117    /* Truncate file to current length */
00118    return ftruncate(fd, cur);}

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

Definition at line 59 of file format_vox.c.

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

00060 {
00061    int res;
00062    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00063          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00064          return -1;
00065    }
00066    return 0;
00067 }


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 = 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 156 of file format_vox.c.

Definition at line 156 of file format_vox.c.

struct ast_format_def vox_f [static]

Definition at line 127 of file format_vox.c.


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