format_g719.c File Reference

ITU G.719 , 64kbps bitrate only. 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_g719.c:

Go to the source code of this file.

Defines

#define BUF_SIZE   160
#define BYTES_TO_SAMPLES(x)   ((typeof(x)) x * ((float) 960 / 160))
#define SAMPLES_TO_BYTES(x)   ((typeof(x)) x / ((float) 960 / 160))

Functions

static void __reg_module (void)
static void __unreg_module (void)
static struct ast_frameg719read (struct ast_filestream *s, int *whennext)
static int g719seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t g719tell (struct ast_filestream *fs)
static int g719trunc (struct ast_filestream *fs)
static int g719write (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 = "ITU G.719" , .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 g719_f


Detailed Description

ITU G.719 , 64kbps bitrate only.

Definition in file format_g719.c.


Define Documentation

#define BUF_SIZE   160

#define BYTES_TO_SAMPLES (  )     ((typeof(x)) x * ((float) 960 / 160))

Definition at line 41 of file format_g719.c.

Referenced by g719read(), g719tell(), siren14read(), siren14tell(), siren7read(), and siren7tell().

#define SAMPLES_TO_BYTES (  )     ((typeof(x)) x / ((float) 960 / 160))

Definition at line 40 of file format_g719.c.

Referenced by g719seek(), siren14seek(), and siren7seek().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 157 of file format_g719.c.

static void __unreg_module ( void   )  [static]

Definition at line 157 of file format_g719.c.

static struct ast_frame* g719read ( struct ast_filestream s,
int *  whennext 
) [static, read]

Definition at line 43 of file format_g719.c.

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

00044 {
00045    int res;
00046    /* Send a frame from the file to the appropriate channel */
00047 
00048    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
00049    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00050       if (res)
00051          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00052       return NULL;
00053    }
00054    *whennext = s->fr.samples = BYTES_TO_SAMPLES(res);
00055    return &s->fr;
00056 }

static int g719seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 69 of file format_g719.c.

References ast_log, AST_LOG_WARNING, errno, ast_filestream::f, max, min, ast_frame::offset, SAMPLES_TO_BYTES, and SEEK_FORCECUR.

00070 {
00071    off_t offset = 0, min = 0, cur, max;
00072 
00073    sample_offset = SAMPLES_TO_BYTES(sample_offset);
00074 
00075    if ((cur = ftello(fs->f)) < 0) {
00076       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00077       return -1;
00078    }
00079 
00080    if (fseeko(fs->f, 0, SEEK_END) < 0) {
00081       ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
00082       return -1;
00083    }
00084 
00085    if ((max = ftello(fs->f)) < 0) {
00086       ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
00087       return -1;
00088    }
00089 
00090    if (whence == SEEK_SET)
00091       offset = sample_offset;
00092    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00093       offset = sample_offset + cur;
00094    else if (whence == SEEK_END)
00095       offset = max - sample_offset;
00096 
00097    if (whence != SEEK_FORCECUR)
00098       offset = (offset > max) ? max : offset;
00099 
00100    /* always protect against seeking past begining. */
00101    offset = (offset < min) ? min : offset;
00102 
00103    return fseeko(fs->f, offset, SEEK_SET);
00104 }

static off_t g719tell ( struct ast_filestream fs  )  [static]

Definition at line 122 of file format_g719.c.

References BYTES_TO_SAMPLES, and ast_filestream::f.

00123 {
00124    return BYTES_TO_SAMPLES(ftello(fs->f));
00125 }

static int g719trunc ( struct ast_filestream fs  )  [static]

Definition at line 106 of file format_g719.c.

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

00107 {
00108    int fd;
00109    off_t cur;
00110 
00111    if ((fd = fileno(fs->f)) < 0) {
00112       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g719 filestream %p: %s\n", fs, strerror(errno));
00113       return -1;
00114    }
00115    if ((cur = ftello(fs->f)) < 0) {
00116       ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
00117       return -1;
00118    }
00119    return ftruncate(fd, cur);
00120 }

static int g719write ( struct ast_filestream fs,
struct ast_frame f 
) [static]

Definition at line 58 of file format_g719.c.

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

00059 {
00060    int res;
00061 
00062    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00063       ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00064       return -1;
00065    }
00066    return 0;
00067 }

static int load_module ( void   )  [static]

static int unload_module ( void   )  [static]

Definition at line 147 of file format_g719.c.

References ast_format_def_unregister(), and ast_format_def::name.

00148 {
00149    return ast_format_def_unregister(g719_f.name);
00150 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "ITU G.719" , .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 157 of file format_g719.c.

Definition at line 157 of file format_g719.c.

struct ast_format_def g719_f [static]

Definition at line 127 of file format_g719.c.


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