format_g723.c File Reference

Old-style G.723.1 frame/timestamp format. More...

#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/format_cache.h"

Include dependency graph for format_g723.c:

Go to the source code of this file.

Macros
#define	G723_MAX_SIZE   1024

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static struct ast_frame *	g723_read (struct ast_filestream *s, int *whennext)
static int	g723_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	g723_tell (struct ast_filestream *fs)
static int	g723_trunc (struct ast_filestream *fs)
static int	g723_write (struct ast_filestream *s, 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 = "G.723.1 Simple Timestamp File Format" , .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	g723_1_f

Detailed Description

Old-style G.723.1 frame/timestamp format.

• Extensions: g723, g723sf

Definition in file format_g723.c.

Macro Definition Documentation

G723_MAX_SIZE

#define G723_MAX_SIZE   1024

Definition at line 38 of file format_g723.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 163 of file format_g723.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 163 of file format_g723.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 163 of file format_g723.c.

g723_read()

static struct ast_frame * g723_read ( struct ast_filestream *  s, int *  whennext  )

static

Definition at line 40 of file format_g723.c.

{
    unsigned short size;
    size_t res;
    int delay;
    /* Read the delay for the next packet, and schedule again if necessary */
    /* XXX is this ignored ? */
    if (fread(&delay, 1, 4, s->f) == 4)
        delay = ntohl(delay);
    else
        delay = -1;
    if (fread(&size, 1, 2, s->f) != 2) {
        /* Out of data, or the file is no longer valid.  In any case
           go ahead and stop the stream */
        return NULL;
    }
    /* Looks like we have a frame to read from here */
    size = ntohs(size);
    if (size > G723_MAX_SIZE) {
        ast_log(LOG_WARNING, "Size %d is invalid\n", size);
        /* The file is apparently no longer any good, as we
           shouldn't ever get frames even close to this
           size.  */
        return NULL;
    }
    /* Read the data into the buffer */
    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, 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 = 240;
    return &s->fr;
}

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, G723_MAX_SIZE, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

g723_seek()

static int g723_seek ( struct ast_filestream *  fs, off_t  sample_offset, int  whence  )

static

Definition at line 106 of file format_g723.c.

{
    return -1;
}

g723_tell()

static off_t g723_tell ( struct ast_filestream *  fs )

static

Definition at line 128 of file format_g723.c.

{
    return -1;
}

g723_trunc()

static int g723_trunc ( struct ast_filestream *  fs )

static

Definition at line 111 of file format_g723.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g723 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 g723 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.

g723_write()

static int g723_write ( struct ast_filestream *  s, struct ast_frame *  f  )

static

Definition at line 79 of file format_g723.c.

{
    uint32_t delay;
    uint16_t size;
    int res;
    /* XXX there used to be a check s->fr means a read stream */
    delay = 0;
    if (f->datalen <= 0) {
        ast_log(LOG_WARNING, "Short frame ignored (%d bytes long?)\n", f->datalen);
        return 0;
    }
    if ((res = fwrite(&delay, 1, 4, s->f)) != 4) {
        ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno));
        return -1;
    }
    size = htons(f->datalen);
    if ((res = fwrite(&size, 1, 2, s->f)) != 2) {
        ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno));
        return -1;
    }
    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
        ast_log(LOG_WARNING, "Unable to write frame: res=%d (%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 144 of file format_g723.c.

{
    g723_1_f.format = ast_format_g723;
 
    if (ast_format_def_register(&g723_1_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_def_register, ast_format_g723, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and g723_1_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 153 of file format_g723.c.

{
    return ast_format_def_unregister(g723_1_f.name);
}

References ast_format_def_unregister(), g723_1_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 = "G.723.1 Simple Timestamp File Format" , .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 163 of file format_g723.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 163 of file format_g723.c.

g723_1_f

struct ast_format_def g723_1_f

static

Definition at line 133 of file format_g723.c.

Referenced by load_module(), and unload_module().