Wed Aug 18 22:34:23 2010

Asterisk developer's documentation


format_ilbc.c File Reference

Save to raw, headerless iLBC data. 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 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_ORDER , .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 = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, .load_pri = 10, }
static 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 40 of file format_ilbc.c.

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

#define ILBC_SAMPLES   240

Definition at line 41 of file format_ilbc.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 150 of file format_ilbc.c.

static void __unreg_module ( void   )  [static]

Definition at line 150 of file format_ilbc.c.

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

Definition at line 43 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.

00044 {
00045    int res;
00046    /* Send a frame from the file to the appropriate channel */
00047    s->fr.frametype = AST_FRAME_VOICE;
00048    s->fr.subclass = AST_FORMAT_ILBC;
00049    s->fr.mallocd = 0;
00050    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE);
00051    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
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 = ILBC_SAMPLES;
00057    return &s->fr;
00058 }

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

Definition at line 82 of file format_ilbc.c.

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

00083 {
00084    long bytes;
00085    off_t min,cur,max,offset=0;
00086    min = 0;
00087    cur = ftello(fs->f);
00088    fseeko(fs->f, 0, SEEK_END);
00089    max = ftello(fs->f);
00090    
00091    bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
00092    if (whence == SEEK_SET)
00093       offset = bytes;
00094    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00095       offset = cur + bytes;
00096    else if (whence == SEEK_END)
00097       offset = max - bytes;
00098    if (whence != SEEK_FORCECUR) {
00099       offset = (offset > max)?max:offset;
00100    }
00101    /* protect against seeking beyond begining. */
00102    offset = (offset < min)?min:offset;
00103    if (fseeko(fs->f, offset, SEEK_SET) < 0)
00104       return -1;
00105    return 0;
00106 }

static off_t ilbc_tell ( struct ast_filestream fs  )  [static]

Definition at line 116 of file format_ilbc.c.

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

00117 {
00118    off_t offset = ftello(fs->f);
00119    return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES;
00120 }

static int ilbc_trunc ( struct ast_filestream fs  )  [static]

Definition at line 108 of file format_ilbc.c.

References ast_filestream::f.

00109 {
00110    /* Truncate file to current length */
00111    if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
00112       return -1;
00113    return 0;
00114 }

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

Definition at line 60 of file format_ilbc.c.

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

00061 {
00062    int res;
00063    if (f->frametype != AST_FRAME_VOICE) {
00064       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00065       return -1;
00066    }
00067    if (f->subclass != AST_FORMAT_ILBC) {
00068       ast_log(LOG_WARNING, "Asked to write non-iLBC frame (%d)!\n", f->subclass);
00069       return -1;
00070    }
00071    if (f->datalen % 50) {
00072       ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
00073       return -1;
00074    }
00075    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00076          ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
00077          return -1;
00078    }
00079    return 0;
00080 }

static int load_module ( void   )  [static]

Definition at line 134 of file format_ilbc.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and ilbc_f.

00135 {
00136    if (ast_format_register(&ilbc_f))
00137       return AST_MODULE_LOAD_FAILURE;
00138    return AST_MODULE_LOAD_SUCCESS;
00139 }

static int unload_module ( void   )  [static]

Definition at line 141 of file format_ilbc.c.

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

00142 {
00143    return ast_format_unregister(ilbc_f.name);
00144 }  


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .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 = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, .load_pri = 10, } [static]

Definition at line 150 of file format_ilbc.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 150 of file format_ilbc.c.

struct ast_format ilbc_f [static]

Definition at line 122 of file format_ilbc.c.

Referenced by load_module(), and unload_module().


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