Tue Aug 20 16:35:03 2013

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

 AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Raw iLBC data",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND)
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_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

AST_MODULE_INFO ( ASTERISK_GPL_KEY  ,
AST_MODFLAG_LOAD_ORDER  ,
"Raw iLBC data"  ,
load = load_module,
unload = unload_module,
load_pri = AST_MODPRI_APP_DEPEND 
)
static struct ast_frame* ilbc_read ( struct ast_filestream s,
int *  whennext 
) [static, read]

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(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

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, and AST_MODULE_LOAD_SUCCESS.

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(), and ast_format::name.

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


Variable Documentation

struct ast_format ilbc_f [static]

Definition at line 135 of file format_ilbc.c.


Generated on 20 Aug 2013 for Asterisk - The Open Source Telephony Project by  doxygen 1.6.1