format_g729.c File Reference

Save to raw, headerless G729 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_g729.c:

Go to the source code of this file.

Macros
#define	BUF_SIZE   20 /* two G729 frames */
#define	G729A_SAMPLES   160

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static struct ast_frame *	g729_read (struct ast_filestream *s, int *whennext)
static int	g729_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	g729_tell (struct ast_filestream *fs)
static int	g729_trunc (struct ast_filestream *fs)
static int	g729_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 G.729 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 const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format_def	g729_f

Detailed Description

Save to raw, headerless G729 data.

Note

This is not an encoder/decoder. The codec for g729 is only available with a commercial license from Digium, due to patent restrictions. Check http://www.digium.com for information.

• Extensions: g729

Definition in file format_g729.c.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   20 /* two G729 frames */

Definition at line 44 of file format_g729.c.

G729A_SAMPLES

#define G729A_SAMPLES   160

Definition at line 45 of file format_g729.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 159 of file format_g729.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 159 of file format_g729.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 159 of file format_g729.c.

g729_read()

static struct ast_frame * g729_read ( struct ast_filestream *  s, int *  whennext  )

static

Definition at line 47 of file format_g729.c.

{
    size_t res;
 
    /* Send a frame from the file to the appropriate channel */
    s->fr.samples = G729A_SAMPLES;
    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 && res != 10) /* XXX what for ? */ {
            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;
    return &s->fr;
}

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, G729A_SAMPLES, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

g729_seek()

static int g729_seek ( struct ast_filestream *  fs, off_t  sample_offset, int  whence  )

static

Definition at line 81 of file format_g729.c.

{
    long bytes;
    off_t min,cur,max,offset=0;
    min = 0;
    cur = ftello(fs->f);
    fseeko(fs->f, 0, SEEK_END);
    max = ftello(fs->f);
 
    bytes = BUF_SIZE * (sample_offset / G729A_SAMPLES);
    if (whence == SEEK_SET)
        offset = bytes;
    else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
        offset = cur + bytes;
    else if (whence == SEEK_END)
        offset = max - bytes;
    if (whence != SEEK_FORCECUR) {
        offset = (offset > max)?max:offset;
    }
    /* protect against seeking beyond begining. */
    offset = (offset < min)?min:offset;
    if (fseeko(fs->f, offset, SEEK_SET) < 0)
        return -1;
    return 0;
}

References BUF_SIZE, ast_filestream::f, G729A_SAMPLES, max, min, ast_frame::offset, and SEEK_FORCECUR.

g729_tell()

static off_t g729_tell ( struct ast_filestream *  fs )

static

Definition at line 124 of file format_g729.c.

{
    off_t offset = ftello(fs->f);
    return (offset/BUF_SIZE)*G729A_SAMPLES;
}

References BUF_SIZE, ast_filestream::f, G729A_SAMPLES, and ast_frame::offset.

g729_trunc()

static int g729_trunc ( struct ast_filestream *  fs )

static

Definition at line 107 of file format_g729.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g729 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 g729 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    /* Truncate file to current length */
    return ftruncate(fd, cur);
}

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

g729_write()

static int g729_write ( struct ast_filestream *  fs, struct ast_frame *  f  )

static

Definition at line 66 of file format_g729.c.

{
    int res;
 
    if (f->datalen % 10) {
        ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 10\n", f->datalen);
        return -1;
    }
    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
            ast_log(LOG_WARNING, "Bad write (%d/10): %s\n", res, 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 141 of file format_g729.c.

{
    g729_f.format = ast_format_g729;
    if (ast_format_def_register(&g729_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_def_register, ast_format_g729, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and g729_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 149 of file format_g729.c.

{
    return ast_format_def_unregister(g729_f.name);
}

References ast_format_def_unregister(), g729_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 = "Raw G.729 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 159 of file format_g729.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 159 of file format_g729.c.

g729_f

struct ast_format_def g729_f

static

Definition at line 130 of file format_g729.c.

Referenced by load_module(), and unload_module().