Thu Apr 28 2011 16:57:10

Asterisk developer's documentation


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 dependency graph for format_g723.c:

Go to the source code of this file.

Defines

#define G723_MAX_SIZE   1024

Functions

static void __reg_module (void)
static void __unreg_module (void)
static struct ast_frameg723_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
__MODULE_INFO_SECTION 
__mod_info = { __MODULE_INFO_GLOBALS .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, .load = load_module, .unload = unload_module, .load_pri = 10, }
static struct ast_module_infoast_module_info = &__mod_info
static struct ast_format g723_1_f

Detailed Description

Old-style G.723.1 frame/timestamp format.

  • Extensions: g723, g723sf

Definition in file format_g723.c.


Define Documentation

#define G723_MAX_SIZE   1024

Definition at line 35 of file format_g723.c.

Referenced by g723_read().


Function Documentation

static void __reg_module ( void  ) [static]

Definition at line 156 of file format_g723.c.

static void __unreg_module ( void  ) [static]

Definition at line 156 of file format_g723.c.

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

Definition at line 37 of file format_g723.c.

References AST_FORMAT_G723_1, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, G723_MAX_SIZE, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

{
   unsigned short size;
   int 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 */
   s->fr.frametype = AST_FRAME_VOICE;
   s->fr.subclass = AST_FORMAT_G723_1;
   s->fr.mallocd = 0;
   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)) != size) {
      ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno));
      return NULL;
   }
   *whennext = s->fr.samples = 240;
   return &s->fr;
}
static int g723_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 110 of file format_g723.c.

{
   return -1;
}
static off_t g723_tell ( struct ast_filestream fs) [static]

Definition at line 123 of file format_g723.c.

{
   return -1;
}
static int g723_trunc ( struct ast_filestream fs) [static]

Definition at line 115 of file format_g723.c.

References ast_filestream::f.

{
   /* Truncate file to current length */
   if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
      return -1;
   return 0;
}
static int g723_write ( struct ast_filestream s,
struct ast_frame f 
) [static]

Definition at line 75 of file format_g723.c.

References AST_FORMAT_G723_1, AST_FRAME_VOICE, ast_log(), ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, fwrite, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

{
   uint32_t delay;
   uint16_t size;
   int res;
   /* XXX there used to be a check s->fr means a read stream */
   if (f->frametype != AST_FRAME_VOICE) {
      ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
      return -1;
   }
   if (f->subclass != AST_FORMAT_G723_1) {
      ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n");
      return -1;
   }
   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;
}
static int load_module ( void  ) [static]
static int unload_module ( void  ) [static]

Definition at line 147 of file format_g723.c.

References ast_format_unregister(), and ast_format::name.


Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .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, .load = load_module, .unload = unload_module, .load_pri = 10, } [static]

Definition at line 156 of file format_g723.c.

Definition at line 156 of file format_g723.c.

struct ast_format g723_1_f [static]

Definition at line 128 of file format_g723.c.