Mon Oct 8 12:39:22 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 = "ac1f6a56484a8820659555499174e588" , .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 165 of file format_vox.c.

static void __unreg_module ( void   )  [static]

Definition at line 165 of file format_vox.c.

static int load_module ( void   )  [static]

Definition at line 149 of file format_vox.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and vox_f.

00150 {
00151    if (ast_format_register(&vox_f))
00152       return AST_MODULE_LOAD_FAILURE;
00153    return AST_MODULE_LOAD_SUCCESS;
00154 }

static int unload_module ( void   )  [static]

Definition at line 156 of file format_vox.c.

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

00157 {
00158    return ast_format_unregister(vox_f.name);
00159 }

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_log(), AST_LOG_WARNING, errno, ast_filestream::f, ast_frame::offset, and SEEK_FORCECUR.

00080 {
00081    off_t offset = 0, min = 0, cur, max, distance;
00082 
00083    if ((cur = ftello(fs->f)) < 0) {
00084       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00085       return -1;
00086    }
00087 
00088    if (fseeko(fs->f, 0, SEEK_END) < 0) {
00089       ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
00090       return -1;
00091    }
00092 
00093    if ((max = ftello(fs->f)) < 0) {
00094       ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
00095       return -1;
00096    }
00097 
00098    /* have to fudge to frame here, so not fully to sample */
00099    distance = sample_offset/2;
00100    if (whence == SEEK_SET) {
00101       offset = distance;
00102    } else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
00103       offset = distance + cur;
00104    } else if (whence == SEEK_END) {
00105       offset = max - distance;
00106    }
00107    if (whence != SEEK_FORCECUR) {
00108       offset = (offset > max)?max:offset;
00109       offset = (offset < min)?min:offset;
00110    }
00111    return fseeko(fs->f, offset, SEEK_SET);
00112 }

static off_t vox_tell ( struct ast_filestream fs  )  [static]

Definition at line 130 of file format_vox.c.

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

00131 {
00132      off_t offset;
00133      offset = ftello(fs->f) << 1;
00134      return offset; 
00135 }

static int vox_trunc ( struct ast_filestream fs  )  [static]

Definition at line 114 of file format_vox.c.

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

00115 {
00116    int fd;
00117    off_t cur;
00118 
00119    if ((fd = fileno(fs->f)) < 0) {
00120       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for vox filestream %p: %s\n", fs, strerror(errno));
00121       return -1;
00122    }
00123    if ((cur = ftello(fs->f)) < 0) {
00124       ast_log(AST_LOG_WARNING, "Unable to determine current position in vox filestream %p: %s\n", fs, strerror(errno));
00125       return -1;
00126    }
00127    /* Truncate file to current length */
00128    return ftruncate(fd, cur);}

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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 165 of file format_vox.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 165 of file format_vox.c.

struct ast_format vox_f [static]

Definition at line 137 of file format_vox.c.

Referenced by load_module(), and unload_module().


Generated on Mon Oct 8 12:39:22 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7