Mon Oct 8 12:39:22 2012

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 = "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 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 44 of file format_ilbc.c.

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

#define ILBC_SAMPLES   240

Definition at line 45 of file format_ilbc.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 163 of file format_ilbc.c.

static void __unreg_module ( void   )  [static]

Definition at line 163 of file format_ilbc.c.

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

Definition at line 47 of file format_ilbc.c.

References AST_FORMAT_ILBC, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, ILBC_BUF_SIZE, ILBC_SAMPLES, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

00048 {
00049    int res;
00050    /* Send a frame from the file to the appropriate channel */
00051    s->fr.frametype = AST_FRAME_VOICE;
00052    s->fr.subclass.codec = AST_FORMAT_ILBC;
00053    s->fr.mallocd = 0;
00054    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, ILBC_BUF_SIZE);
00055    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00056       if (res)
00057          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00058       return NULL;
00059    }
00060    *whennext = s->fr.samples = ILBC_SAMPLES;
00061    return &s->fr;
00062 }

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

Definition at line 86 of file format_ilbc.c.

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

00087 {
00088    long bytes;
00089    off_t min,cur,max,offset=0;
00090    min = 0;
00091    cur = ftello(fs->f);
00092    fseeko(fs->f, 0, SEEK_END);
00093    max = ftello(fs->f);
00094    
00095    bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
00096    if (whence == SEEK_SET)
00097       offset = bytes;
00098    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00099       offset = cur + bytes;
00100    else if (whence == SEEK_END)
00101       offset = max - bytes;
00102    if (whence != SEEK_FORCECUR) {
00103       offset = (offset > max)?max:offset;
00104    }
00105    /* protect against seeking beyond begining. */
00106    offset = (offset < min)?min:offset;
00107    if (fseeko(fs->f, offset, SEEK_SET) < 0)
00108       return -1;
00109    return 0;
00110 }

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 ast_frame::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 112 of file format_ilbc.c.

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

00113 {
00114    int fd;
00115    off_t cur;
00116 
00117    if ((fd = fileno(fs->f)) < 0) {
00118       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for iLBC filestream %p: %s\n", fs, strerror(errno));
00119       return -1;
00120    }
00121    if ((cur = ftello(fs->f)) < 0) {
00122       ast_log(AST_LOG_WARNING, "Unable to determine current position in iLBC filestream %p: %s\n", fs, strerror(errno));
00123       return -1;
00124    }
00125    /* Truncate file to current length */
00126    return ftruncate(fd, cur);
00127 }

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

Definition at line 64 of file format_ilbc.c.

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

00065 {
00066    int res;
00067    if (f->frametype != AST_FRAME_VOICE) {
00068       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00069       return -1;
00070    }
00071    if (f->subclass.codec != AST_FORMAT_ILBC) {
00072       ast_log(LOG_WARNING, "Asked to write non-iLBC frame (%s)!\n", ast_getformatname(f->subclass.codec));
00073       return -1;
00074    }
00075    if (f->datalen % 50) {
00076       ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
00077       return -1;
00078    }
00079    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00080          ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
00081          return -1;
00082    }
00083    return 0;
00084 }

static int load_module ( void   )  [static]

Definition at line 147 of file format_ilbc.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and ilbc_f.

00148 {
00149    if (ast_format_register(&ilbc_f))
00150       return AST_MODULE_LOAD_FAILURE;
00151    return AST_MODULE_LOAD_SUCCESS;
00152 }

static int unload_module ( void   )  [static]

Definition at line 154 of file format_ilbc.c.

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

00155 {
00156    return ast_format_unregister(ilbc_f.name);
00157 }


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

Definition at line 163 of file format_ilbc.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 163 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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