Fri Aug 17 00:17:40 2018

Asterisk developer's documentation


format_vox.c File Reference

Flat, binary, ADPCM vox file format. 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 BUF_SIZE   80
#define VOX_SAMPLES   160

Functions

 AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Dialogic VOX (ADPCM) File Format",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND)
static int load_module (void)
static int unload_module (void)
static struct ast_framevox_read (struct ast_filestream *s, int *whennext)
static int vox_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t vox_tell (struct ast_filestream *fs)
static int vox_trunc (struct ast_filestream *fs)
static int vox_write (struct ast_filestream *s, struct ast_frame *f)

Variables

static struct ast_format vox_f

Detailed Description

Flat, binary, ADPCM vox file format.

Definition in file format_vox.c.


Define Documentation

#define BUF_SIZE   80

Definition at line 39 of file format_vox.c.

#define VOX_SAMPLES   160

Definition at line 40 of file format_vox.c.


Function Documentation

AST_MODULE_INFO ( ASTERISK_GPL_KEY  ,
AST_MODFLAG_LOAD_ORDER  ,
"Dialogic VOX (ADPCM) File Format"  ,
load = load_module,
unload = unload_module,
load_pri = AST_MODPRI_APP_DEPEND 
)
static int load_module ( void   )  [static]

Definition at line 149 of file format_vox.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

00150 {
00151    if (ast_format_register(&vox_f))
00152       return AST_MODULE_LOAD_FAILURE;
00153    return AST_MODULE_LOAD_SUCCESS;
00154 }

static int unload_module ( void   )  [static]

Definition at line 156 of file format_vox.c.

References ast_format_unregister(), and ast_format::name.

00157 {
00158    return ast_format_unregister(vox_f.name);
00159 }

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

Definition at line 42 of file format_vox.c.

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

00043 {
00044    int res;
00045 
00046    /* Send a frame from the file to the appropriate channel */
00047    s->fr.frametype = AST_FRAME_VOICE;
00048    s->fr.subclass.codec = AST_FORMAT_ADPCM;
00049    s->fr.mallocd = 0;
00050    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00051    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
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 = res * 2;
00057    s->fr.datalen = res;
00058    return &s->fr;
00059 }

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

Definition at line 79 of file format_vox.c.

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

00080 {
00081    off_t offset = 0, min = 0, cur, max, distance;
00082 
00083    if ((cur = ftello(fs->f)) < 0) {
00084       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00085       return -1;
00086    }
00087 
00088    if (fseeko(fs->f, 0, SEEK_END) < 0) {
00089       ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
00090       return -1;
00091    }
00092 
00093    if ((max = ftello(fs->f)) < 0) {
00094       ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
00095       return -1;
00096    }
00097 
00098    /* have to fudge to frame here, so not fully to sample */
00099    distance = sample_offset/2;
00100    if (whence == SEEK_SET) {
00101       offset = distance;
00102    } else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
00103       offset = distance + cur;
00104    } else if (whence == SEEK_END) {
00105       offset = max - distance;
00106    }
00107    if (whence != SEEK_FORCECUR) {
00108       offset = (offset > max)?max:offset;
00109       offset = (offset < min)?min:offset;
00110    }
00111    return fseeko(fs->f, offset, SEEK_SET);
00112 }

static off_t vox_tell ( struct ast_filestream fs  )  [static]

Definition at line 130 of file format_vox.c.

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

00131 {
00132      off_t offset;
00133      offset = ftello(fs->f) << 1;
00134      return offset; 
00135 }

static int vox_trunc ( struct ast_filestream fs  )  [static]

Definition at line 114 of file format_vox.c.

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

00115 {
00116    int fd;
00117    off_t cur;
00118 
00119    if ((fd = fileno(fs->f)) < 0) {
00120       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for vox filestream %p: %s\n", fs, strerror(errno));
00121       return -1;
00122    }
00123    if ((cur = ftello(fs->f)) < 0) {
00124       ast_log(AST_LOG_WARNING, "Unable to determine current position in vox filestream %p: %s\n", fs, strerror(errno));
00125       return -1;
00126    }
00127    /* Truncate file to current length */
00128    return ftruncate(fd, cur);}

static int vox_write ( struct ast_filestream s,
struct ast_frame f 
) [static]

Definition at line 61 of file format_vox.c.

References AST_FORMAT_ADPCM, 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.

00062 {
00063    int res;
00064    if (f->frametype != AST_FRAME_VOICE) {
00065       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00066       return -1;
00067    }
00068    if (f->subclass.codec != AST_FORMAT_ADPCM) {
00069       ast_log(LOG_WARNING, "Asked to write non-ADPCM frame (%s)!\n", ast_getformatname(f->subclass.codec));
00070       return -1;
00071    }
00072    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00073          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00074          return -1;
00075    }
00076    return 0;
00077 }


Variable Documentation

struct ast_format vox_f [static]

Definition at line 137 of file format_vox.c.


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