Thu Sep 7 01:03:28 2017

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"

Go to the source code of this file.

Defines

#define G723_MAX_SIZE   1024

Functions

 AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"G.723.1 Simple Timestamp File Format",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND)
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 39 of file format_g723.c.

Referenced by g723_read().


Function Documentation

AST_MODULE_INFO ( ASTERISK_GPL_KEY  ,
AST_MODFLAG_LOAD_ORDER  ,
"G.723.1 Simple Timestamp File Format"  ,
load = load_module,
unload = unload_module,
load_pri = AST_MODPRI_APP_DEPEND 
)
static struct ast_frame* g723_read ( struct ast_filestream s,
int *  whennext 
) [static, read]

Definition at line 41 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_subclass::codec, 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.

00042 {
00043    unsigned short size;
00044    int res;
00045    int delay;
00046    /* Read the delay for the next packet, and schedule again if necessary */
00047    /* XXX is this ignored ? */
00048    if (fread(&delay, 1, 4, s->f) == 4) 
00049       delay = ntohl(delay);
00050    else
00051       delay = -1;
00052    if (fread(&size, 1, 2, s->f) != 2) {
00053       /* Out of data, or the file is no longer valid.  In any case
00054          go ahead and stop the stream */
00055       return NULL;
00056    }
00057    /* Looks like we have a frame to read from here */
00058    size = ntohs(size);
00059    if (size > G723_MAX_SIZE) {
00060       ast_log(LOG_WARNING, "Size %d is invalid\n", size);
00061       /* The file is apparently no longer any good, as we
00062          shouldn't ever get frames even close to this 
00063          size.  */
00064       return NULL;
00065    }
00066    /* Read the data into the buffer */
00067    s->fr.frametype = AST_FRAME_VOICE;
00068    s->fr.subclass.codec = AST_FORMAT_G723_1;
00069    s->fr.mallocd = 0;
00070    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, size);
00071    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != size) {
00072       ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno));
00073       return NULL;
00074    }
00075    *whennext = s->fr.samples = 240;
00076    return &s->fr;
00077 }

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

Definition at line 114 of file format_g723.c.

00115 {
00116    return -1;
00117 }

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 119 of file format_g723.c.

References ast_log(), AST_LOG_WARNING, errno, and ast_filestream::f.

00120 {
00121    int fd;
00122    off_t cur;
00123 
00124    if ((fd = fileno(fs->f)) < 0) {
00125       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g723 filestream %p: %s\n", fs, strerror(errno));
00126       return -1;
00127    }
00128    if ((cur = ftello(fs->f)) < 0) {
00129       ast_log(AST_LOG_WARNING, "Unable to determine current position in g723 filestream %p: %s\n", fs, strerror(errno));
00130       return -1;
00131    }
00132    /* Truncate file to current length */
00133    return ftruncate(fd, cur);
00134 }

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

Definition at line 79 of file format_g723.c.

References AST_FORMAT_G723_1, AST_FRAME_VOICE, 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.

00080 {
00081    uint32_t delay;
00082    uint16_t size;
00083    int res;
00084    /* XXX there used to be a check s->fr means a read stream */
00085    if (f->frametype != AST_FRAME_VOICE) {
00086       ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00087       return -1;
00088    }
00089    if (f->subclass.codec != AST_FORMAT_G723_1) {
00090       ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n");
00091       return -1;
00092    }
00093    delay = 0;
00094    if (f->datalen <= 0) {
00095       ast_log(LOG_WARNING, "Short frame ignored (%d bytes long?)\n", f->datalen);
00096       return 0;
00097    }
00098    if ((res = fwrite(&delay, 1, 4, s->f)) != 4) {
00099       ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno));
00100       return -1;
00101    }
00102    size = htons(f->datalen);
00103    if ((res = fwrite(&size, 1, 2, s->f)) != 2) {
00104       ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno));
00105       return -1;
00106    }
00107    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00108       ast_log(LOG_WARNING, "Unable to write frame: res=%d (%s)\n", res, strerror(errno));
00109       return -1;
00110    }  
00111    return 0;
00112 }

static int load_module ( void   )  [static]

Definition at line 153 of file format_g723.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

00154 {
00155    if (ast_format_register(&g723_1_f))
00156       return AST_MODULE_LOAD_FAILURE;
00157    return AST_MODULE_LOAD_SUCCESS;
00158 }

static int unload_module ( void   )  [static]

Definition at line 160 of file format_g723.c.

References ast_format_unregister(), and ast_format::name.

00161 {
00162    return ast_format_unregister(g723_1_f.name);
00163 }


Variable Documentation

struct ast_format g723_1_f [static]

Definition at line 141 of file format_g723.c.


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