Sat Aug 6 00:39:56 2011

Asterisk developer's documentation


format_ilbc.c File Reference

Save to raw, headerless iLBC data. More...

#include "asterisk.h"
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/sched.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"

Go to the source code of this file.

Defines

#define ILBC_BUF_SIZE   50
#define ILBC_SAMPLES   240

Functions

static void __reg_module (void)
static void __unreg_module (void)
static struct ast_frameilbc_read (struct ast_filestream *s, int *whennext)
static int ilbc_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t ilbc_tell (struct ast_filestream *fs)
static int ilbc_trunc (struct ast_filestream *fs)
static int ilbc_write (struct ast_filestream *fs, struct ast_frame *f)
static int load_module (void)
static int unload_module (void)

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "Raw iLBC data" , .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, }
static const struct ast_module_infoast_module_info = &__mod_info
static struct ast_format ilbc_f


Detailed Description

Save to raw, headerless iLBC data.

Definition in file format_ilbc.c.


Define Documentation

#define ILBC_BUF_SIZE   50

Definition at line 53 of file format_ilbc.c.

Referenced by ilbc_read(), ilbc_seek(), and ilbc_tell().

#define ILBC_SAMPLES   240

Definition at line 54 of file format_ilbc.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 160 of file format_ilbc.c.

static void __unreg_module ( void   )  [static]

Definition at line 160 of file format_ilbc.c.

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

Definition at line 56 of file format_ilbc.c.

References AST_FORMAT_ILBC, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), errno, ILBC_BUF_SIZE, ILBC_SAMPLES, LOG_WARNING, and s.

00057 {
00058    int res;
00059    /* Send a frame from the file to the appropriate channel */
00060    s->fr.frametype = AST_FRAME_VOICE;
00061    s->fr.subclass = AST_FORMAT_ILBC;
00062    s->fr.mallocd = 0;
00063    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE);
00064    if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00065       if (res)
00066          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00067       return NULL;
00068    }
00069    *whennext = s->fr.samples = ILBC_SAMPLES;
00070    return &s->fr;
00071 }

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

Definition at line 95 of file format_ilbc.c.

References ast_filestream::f, ILBC_BUF_SIZE, ILBC_SAMPLES, offset, and SEEK_FORCECUR.

00096 {
00097    long bytes;
00098    off_t min,cur,max,offset=0;
00099    min = 0;
00100    cur = ftello(fs->f);
00101    fseeko(fs->f, 0, SEEK_END);
00102    max = ftello(fs->f);
00103    
00104    bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
00105    if (whence == SEEK_SET)
00106       offset = bytes;
00107    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00108       offset = cur + bytes;
00109    else if (whence == SEEK_END)
00110       offset = max - bytes;
00111    if (whence != SEEK_FORCECUR) {
00112       offset = (offset > max)?max:offset;
00113    }
00114    /* protect against seeking beyond begining. */
00115    offset = (offset < min)?min:offset;
00116    if (fseeko(fs->f, offset, SEEK_SET) < 0)
00117       return -1;
00118    return 0;
00119 }

static off_t ilbc_tell ( struct ast_filestream fs  )  [static]

Definition at line 129 of file format_ilbc.c.

References ast_filestream::f, ILBC_BUF_SIZE, ILBC_SAMPLES, and offset.

00130 {
00131    off_t offset = ftello(fs->f);
00132    return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES;
00133 }

static int ilbc_trunc ( struct ast_filestream fs  )  [static]

Definition at line 121 of file format_ilbc.c.

References ast_filestream::f.

00122 {
00123    /* Truncate file to current length */
00124    if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
00125       return -1;
00126    return 0;
00127 }

static int ilbc_write ( struct ast_filestream fs,
struct ast_frame f 
) [static]

Definition at line 73 of file format_ilbc.c.

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

00074 {
00075    int res;
00076    if (f->frametype != AST_FRAME_VOICE) {
00077       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00078       return -1;
00079    }
00080    if (f->subclass != AST_FORMAT_ILBC) {
00081       ast_log(LOG_WARNING, "Asked to write non-iLBC frame (%d)!\n", f->subclass);
00082       return -1;
00083    }
00084    if (f->datalen % 50) {
00085       ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
00086       return -1;
00087    }
00088    if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
00089          ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
00090          return -1;
00091    }
00092    return 0;
00093 }

static int load_module ( void   )  [static]

Definition at line 147 of file format_ilbc.c.

References ast_format_register, and ilbc_f.

00148 {
00149    return ast_format_register(&ilbc_f);
00150 }

static int unload_module ( void   )  [static]

Definition at line 152 of file format_ilbc.c.

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

00153 {
00154    return ast_format_unregister(ilbc_f.name);
00155 }  


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "Raw iLBC data" , .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, } [static]

Definition at line 160 of file format_ilbc.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 160 of file format_ilbc.c.

struct ast_format ilbc_f [static]

Definition at line 135 of file format_ilbc.c.

Referenced by load_module(), and unload_module().


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