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 = 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	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        /* Out of data, or the file is no longer valid.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 = 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 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.

                                        {
    .name = "g723sf",
    .exts = "g723|g723sf",
    .write = g723_write,
    .seek = g723_seek,
    .trunc = g723_trunc,
    .tell = g723_tell,
    .read = g723_read,
    .buf_size = G723_MAX_SIZE + AST_FRIENDLY_OFFSET,
};

Referenced by load_module(), and unload_module().