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.

Macros
#define	BUF_SIZE   160 /* 20 milliseconds == 160 bytes, 960 samples */
#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)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static struct ast_frame *	g719read (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 const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format_def	g719_f

Detailed Description

ITU G.719 , 64kbps bitrate only.

• File name extensions: g719

Definition in file format_g719.c.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   160 /* 20 milliseconds == 160 bytes, 960 samples */

Definition at line 37 of file format_g719.c.

BYTES_TO_SAMPLES

#define BYTES_TO_SAMPLES

(

x

)

((typeof(x)) x * ((float) 960 / 160))

Definition at line 39 of file format_g719.c.

SAMPLES_TO_BYTES

#define SAMPLES_TO_BYTES

(

x

)

((typeof(x)) x / ((float) 960 / 160))

Definition at line 38 of file format_g719.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 158 of file format_g719.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 158 of file format_g719.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 158 of file format_g719.c.

g719read()

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

static

Definition at line 41 of file format_g719.c.

{
    size_t res;
 
    /* Send a frame from the file to the appropriate channel */
    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE);
    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
        if (res) {
            ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
                    ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
                    strerror(errno));
        }
        return NULL;
    }
    *whennext = s->fr.samples = BYTES_TO_SAMPLES(res);
    return &s->fr;
}

References ast_format_get_name(), 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_frame_subclass::format, ast_filestream::fr, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

g719seek()

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

static

Definition at line 70 of file format_g719.c.

{
    off_t offset = 0, min = 0, cur, max;
 
    sample_offset = SAMPLES_TO_BYTES(sample_offset);
 
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    if (fseeko(fs->f, 0, SEEK_END) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    if ((max = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
 
    if (whence == SEEK_SET)
        offset = sample_offset;
    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
        offset = sample_offset + cur;
    else if (whence == SEEK_END)
        offset = max - sample_offset;
 
    if (whence != SEEK_FORCECUR)
        offset = (offset > max) ? max : offset;
 
    /* always protect against seeking past begining. */
    offset = (offset < min) ? min : offset;
 
    return fseeko(fs->f, offset, SEEK_SET);
}

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

g719tell()

static off_t g719tell ( struct ast_filestream *  fs )

static

Definition at line 123 of file format_g719.c.

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

References BYTES_TO_SAMPLES, and ast_filestream::f.

g719trunc()

static int g719trunc ( struct ast_filestream *  fs )

static

Definition at line 107 of file format_g719.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    return ftruncate(fd, cur);
}

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

g719write()

static int g719write ( struct ast_filestream *  fs, struct ast_frame *  f  )

static

Definition at line 59 of file format_g719.c.

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

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

load_module()

static int load_module ( void  )

static

Definition at line 139 of file format_g719.c.

{
    g719_f.format = ast_format_g719;
 
    if (ast_format_def_register(&g719_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_def_register, ast_format_g719, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and g719_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 148 of file format_g719.c.

{
    return ast_format_def_unregister(g719_f.name);
}

References ast_format_def_unregister(), g719_f, and ast_format_def::name.

Variable Documentation

__mod_info

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 158 of file format_g719.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 158 of file format_g719.c.

g719_f

struct ast_format_def g719_f

static

Definition at line 128 of file format_g719.c.

Referenced by load_module(), and unload_module().