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 = 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	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 = 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 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.

                                      {
    .name = "g719",
    .exts = "g719",
    .write = g719write,
    .seek = g719seek,
    .trunc = g719trunc,
    .tell = g719tell,
    .read = g719read,
    .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
};

Referenced by load_module(), and unload_module().