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 = ASTERISK_GPL_KEY , .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 = ASTERISK_GPL_KEY , .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.

                                      {
    .name = "g729",
    .exts = "g729",
    .write = g729_write,
    .seek = g729_seek,
    .trunc = g729_trunc,
    .tell = g729_tell,
    .read = g729_read,
    .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
};

Referenced by load_module(), and unload_module().