Wed Aug 15 01:25:08 2007

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"

Include dependency graph for format_g723.c:

Go to the source code of this file.

Defines

#define G723_MAX_SIZE   1024

Functions

 AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"G.723.1 Simple Timestamp File Format")
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_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

AST_MODULE_INFO_STANDARD ( ASTERISK_GPL_KEY  ,
"G.723.1 Simple Timestamp File Format"   
)

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

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(), ast_filestream::buf, ast_frame::data, ast_frame::datalen, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, G723_MAX_SIZE, LOG_WARNING, ast_frame::mallocd, ast_frame::samples, and ast_frame::subclass.

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00062       /* Out of data, or the file is no longer valid.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(), ast_frame::data, ast_frame::datalen, ast_filestream::f, ast_frame::frametype, LOG_WARNING, and ast_frame::subclass.

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.

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(), and ast_format::name.

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


Variable Documentation

struct ast_format g723_1_f [static]

Definition at line 141 of file format_g723.c.


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