Sat Aug 6 00:39:56 2011

Asterisk developer's documentation


format_g723.c File Reference

Old-style G.723.1 frame/timestamp format. More...

#include "asterisk.h"
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/time.h>
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/sched.h"
#include "asterisk/module.h"

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 __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "G.723.1 Simple Timestamp File Format" , .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, }
static const 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.

Definition in file format_g723.c.


Define Documentation

#define G723_MAX_SIZE   1024

Definition at line 48 of file format_g723.c.

Referenced by g723_read().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 166 of file format_g723.c.

static void __unreg_module ( void   )  [static]

Definition at line 166 of file format_g723.c.

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

Definition at line 50 of file format_g723.c.

References AST_FORMAT_G723_1, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), errno, G723_MAX_SIZE, LOG_WARNING, and s.

00051 {
00052    unsigned short size;
00053    int res;
00054    int delay;
00055    /* Read the delay for the next packet, and schedule again if necessary */
00056    /* XXX is this ignored ? */
00057    if (fread(&delay, 1, 4, s->f) == 4) 
00058       delay = ntohl(delay);
00059    else
00060       delay = -1;
00061    if (fread(&size, 1, 2, s->f) != 2) {
00062       /* Out of data, or the file is no longer valid.  In any case
00063          go ahead and stop the stream */
00064       return NULL;
00065    }
00066    /* Looks like we have a frame to read from here */
00067    size = ntohs(size);
00068    if (size > G723_MAX_SIZE) {
00069       ast_log(LOG_WARNING, "Size %d is invalid\n", size);
00070       /* The file is apparently no longer any good, as we
00071          shouldn't ever get frames even close to this 
00072          size.  */
00073       return NULL;
00074    }
00075    /* Read the data into the buffer */
00076    s->fr.frametype = AST_FRAME_VOICE;
00077    s->fr.subclass = AST_FORMAT_G723_1;
00078    s->fr.mallocd = 0;
00079    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, size);
00080    if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != size) {
00081       ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno));
00082       return NULL;
00083    }
00084    *whennext = s->fr.samples = 240;
00085    return &s->fr;
00086 }

static int g723_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 123 of file format_g723.c.

00124 {
00125    return -1;
00126 }

static off_t g723_tell ( struct ast_filestream fs  )  [static]

Definition at line 136 of file format_g723.c.

00137 {
00138    return -1;
00139 }

static int g723_trunc ( struct ast_filestream fs  )  [static]

Definition at line 128 of file format_g723.c.

References ast_filestream::f.

00129 {
00130    /* Truncate file to current length */
00131    if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
00132       return -1;
00133    return 0;
00134 }

static int g723_write ( struct ast_filestream s,
struct ast_frame f 
) [static]

Definition at line 88 of file format_g723.c.

References AST_FORMAT_G723_1, AST_FRAME_VOICE, ast_log(), errno, f, LOG_WARNING, and s.

00089 {
00090    uint32_t delay;
00091    uint16_t size;
00092    int res;
00093    /* XXX there used to be a check s->fr means a read stream */
00094    if (f->frametype != AST_FRAME_VOICE) {
00095       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00096       return -1;
00097    }
00098    if (f->subclass != AST_FORMAT_G723_1) {
00099       ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n");
00100       return -1;
00101    }
00102    delay = 0;
00103    if (f->datalen <= 0) {
00104       ast_log(LOG_WARNING, "Short frame ignored (%d bytes long?)\n", f->datalen);
00105       return 0;
00106    }
00107    if ((res = fwrite(&delay, 1, 4, s->f)) != 4) {
00108       ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno));
00109       return -1;
00110    }
00111    size = htons(f->datalen);
00112    if ((res = fwrite(&size, 1, 2, s->f)) != 2) {
00113       ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno));
00114       return -1;
00115    }
00116    if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
00117       ast_log(LOG_WARNING, "Unable to write frame: res=%d (%s)\n", res, strerror(errno));
00118       return -1;
00119    }  
00120    return 0;
00121 }

static int load_module ( void   )  [static]

Definition at line 153 of file format_g723.c.

References ast_format_register, and g723_1_f.

00154 {
00155    return ast_format_register(&g723_1_f);
00156 }

static int unload_module ( void   )  [static]

Definition at line 158 of file format_g723.c.

References ast_format_unregister(), g723_1_f, and ast_format::name.

00159 {
00160    return ast_format_unregister(g723_1_f.name);
00161 }  


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "G.723.1 Simple Timestamp File Format" , .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, } [static]

Definition at line 166 of file format_g723.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 166 of file format_g723.c.

struct ast_format g723_1_f [static]

Definition at line 141 of file format_g723.c.

Referenced by load_module(), and unload_module().


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