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"
#include "asterisk/format_cache.h"

Include dependency graph for format_ilbc.c:

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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .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 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 45 of file format_ilbc.c.

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

#define ILBC_SAMPLES   240

Definition at line 46 of file format_ilbc.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 154 of file format_ilbc.c.

static void __unreg_module ( void   )  [static]

Definition at line 154 of file format_ilbc.c.

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

Definition at line 48 of file format_ilbc.c.

References AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ILBC_BUF_SIZE, ILBC_SAMPLES, LOG_WARNING, NULL, ast_frame::ptr, and ast_frame::samples.

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

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

Definition at line 76 of file format_ilbc.c.

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

00077 {
00078    long bytes;
00079    off_t min,cur,max,offset=0;
00080    min = 0;
00081    cur = ftello(fs->f);
00082    fseeko(fs->f, 0, SEEK_END);
00083    max = ftello(fs->f);
00084    
00085    bytes = ILBC_BUF_SIZE * (sample_offset / ILBC_SAMPLES);
00086    if (whence == SEEK_SET)
00087       offset = bytes;
00088    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00089       offset = cur + bytes;
00090    else if (whence == SEEK_END)
00091       offset = max - bytes;
00092    if (whence != SEEK_FORCECUR) {
00093       offset = (offset > max)?max:offset;
00094    }
00095    /* protect against seeking beyond begining. */
00096    offset = (offset < min)?min:offset;
00097    if (fseeko(fs->f, offset, SEEK_SET) < 0)
00098       return -1;
00099    return 0;
00100 }

static off_t ilbc_tell ( struct ast_filestream fs  )  [static]

Definition at line 119 of file format_ilbc.c.

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

00120 {
00121    off_t offset = ftello(fs->f);
00122    return (offset/ILBC_BUF_SIZE)*ILBC_SAMPLES;
00123 }

static int ilbc_trunc ( struct ast_filestream fs  )  [static]

Definition at line 102 of file format_ilbc.c.

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

00103 {
00104    int fd;
00105    off_t cur;
00106 
00107    if ((fd = fileno(fs->f)) < 0) {
00108       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for iLBC filestream %p: %s\n", fs, strerror(errno));
00109       return -1;
00110    }
00111    if ((cur = ftello(fs->f)) < 0) {
00112       ast_log(AST_LOG_WARNING, "Unable to determine current position in iLBC filestream %p: %s\n", fs, strerror(errno));
00113       return -1;
00114    }
00115    /* Truncate file to current length */
00116    return ftruncate(fd, cur);
00117 }

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

Definition at line 62 of file format_ilbc.c.

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

00063 {
00064    int res;
00065    if (f->datalen % 50) {
00066       ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 50\n", f->datalen);
00067       return -1;
00068    }
00069    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00070          ast_log(LOG_WARNING, "Bad write (%d/50): %s\n", res, strerror(errno));
00071          return -1;
00072    }
00073    return 0;
00074 }

static int load_module ( void   )  [static]

static int unload_module ( void   )  [static]

Definition at line 144 of file format_ilbc.c.

References ast_format_def_unregister(), and ast_format_def::name.

00145 {
00146    return ast_format_def_unregister(ilbc_f.name);
00147 }


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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 154 of file format_ilbc.c.

Definition at line 154 of file format_ilbc.c.

struct ast_format_def ilbc_f [static]

Definition at line 125 of file format_ilbc.c.


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