Save to raw, headerless G729 data. More...

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

Include dependency graph for format_g729.c:

Go to the source code of this file.

Defines
#define	BUF_SIZE 20
#define	G729A_SAMPLES 160
Functions
static void	__reg_module (void)
static void	__unreg_module (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 = "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, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format	g729_f

Detailed Description

Save to raw, headerless G729 data.

Note:

This is not an encoder/decoder. The codec fo 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.

Define Documentation

#define BUF_SIZE 20

Definition at line 45 of file format_g729.c.

Referenced by g729_read(), g729_seek(), and g729_tell().

#define G729A_SAMPLES 160

Definition at line 46 of file format_g729.c.

Referenced by g729_read(), g729_seek(), and g729_tell().

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 156 of file format_g729.c.

static void __unreg_module ( void ) [static]

Definition at line 156 of file format_g729.c.

static struct ast_frame* g729_read	(	struct ast_filestream *	s,
		int *	whennext
	)		`[static, read]`

Definition at line 48 of file format_g729.c.

References AST_FORMAT_G729A, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, G729A_SAMPLES, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

{
   int res;
   /* Send a frame from the file to the appropriate channel */
   s->fr.frametype = AST_FRAME_VOICE;
   s->fr.subclass.codec = AST_FORMAT_G729A;
   s->fr.mallocd = 0;
   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 (%d) (%s)!\n", res, strerror(errno));
      return NULL;
   }
   *whennext = s->fr.samples;
   return &s->fr;
}

static int g729_seek	(	struct ast_filestream *	fs,
		off_t	sample_offset,
		int	whence
	)		`[static]`

Definition at line 88 of file format_g729.c.

References BUF_SIZE, ast_filestream::f, G729A_SAMPLES, ast_frame::offset, and SEEK_FORCECUR.

{
   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;
}

static off_t g729_tell ( struct ast_filestream * fs ) [static]

Definition at line 122 of file format_g729.c.

References BUF_SIZE, ast_filestream::f, G729A_SAMPLES, and ast_frame::offset.

{
   off_t offset = ftello(fs->f);
   return (offset/BUF_SIZE)*G729A_SAMPLES;
}

static int g729_trunc ( struct ast_filestream * fs ) [static]

Definition at line 114 of file format_g729.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 g729_write	(	struct ast_filestream *	fs,
		struct ast_frame *	f
	)		`[static]`

Definition at line 66 of file format_g729.c.

References AST_FORMAT_G729A, AST_FRAME_VOICE, ast_getformatname(), ast_log(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

{
   int res;
   if (f->frametype != AST_FRAME_VOICE) {
      ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
      return -1;
   }
   if (f->subclass.codec != AST_FORMAT_G729A) {
      ast_log(LOG_WARNING, "Asked to write non-G729 frame (%s)!\n", ast_getformatname(f->subclass.codec));
      return -1;
   }
   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;
}

static int load_module ( void ) [static]

Definition at line 140 of file format_g729.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

{
   if (ast_format_register(&g729_f))
      return AST_MODULE_LOAD_FAILURE;
   return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module ( void ) [static]

Definition at line 147 of file format_g729.c.

References ast_format_unregister(), and ast_format::name.

{
   return ast_format_unregister(g729_f.name);
}

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw G.729 data" , .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, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 156 of file format_g729.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 156 of file format_g729.c.

struct ast_format g729_f [static]

Definition at line 128 of file format_g729.c.

Asterisk developer's documentation

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation