Sat Aug 6 00:39:56 2011

Asterisk developer's documentation


format_h263.c File Reference

Save to raw, headerless h263 data. More...

#include "asterisk.h"
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/time.h>
#include <stdio.h>
#include <errno.h>
#include <string.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 "asterisk/endian.h"

Go to the source code of this file.

Data Structures

struct  h263_desc

Defines

#define BUF_SIZE   32768

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int h263_open (struct ast_filestream *s)
static struct ast_frameh263_read (struct ast_filestream *s, int *whennext)
static int h263_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t h263_tell (struct ast_filestream *fs)
static int h263_trunc (struct ast_filestream *fs)
static int h263_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_FIRST | AST_MODFLAG_BUILDSUM, .description = "Raw H.263 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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, }
static const struct ast_module_infoast_module_info = &__mod_info
static struct ast_format h263_f


Detailed Description

Save to raw, headerless h263 data.

Definition in file format_h263.c.


Define Documentation

#define BUF_SIZE   32768

Definition at line 58 of file format_h263.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 200 of file format_h263.c.

static void __unreg_module ( void   )  [static]

Definition at line 200 of file format_h263.c.

static int h263_open ( struct ast_filestream s  )  [static]

Definition at line 65 of file format_h263.c.

References ast_log(), LOG_WARNING, and s.

00066 {
00067    unsigned int ts;
00068    int res;
00069 
00070    if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
00071       ast_log(LOG_WARNING, "Empty file!\n");
00072       return -1;
00073    }
00074    return 0;
00075 }

static struct ast_frame* h263_read ( struct ast_filestream s,
int *  whennext 
) [static]

Definition at line 77 of file format_h263.c.

References AST_FORMAT_H263, AST_FRAME_SET_BUFFER, AST_FRAME_VIDEO, AST_FRIENDLY_OFFSET, ast_log(), BUF_SIZE, errno, h263_desc::lastts, len(), LOG_WARNING, s, and ast_frame::ts.

00078 {
00079    int res;
00080    int mark;
00081    unsigned short len;
00082    unsigned int ts;
00083    struct h263_desc *fs = (struct h263_desc *)s->_private;
00084 
00085    /* Send a frame from the file to the appropriate channel */
00086    if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
00087       return NULL;
00088    len = ntohs(len);
00089    mark = (len & 0x8000) ? 1 : 0;
00090    len &= 0x7fff;
00091    if (len > BUF_SIZE) {
00092       ast_log(LOG_WARNING, "Length %d is too long\n", len);
00093       return NULL;
00094    }
00095    s->fr.frametype = AST_FRAME_VIDEO;
00096    s->fr.subclass = AST_FORMAT_H263;
00097    s->fr.mallocd = 0;
00098    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
00099    if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00100       if (res)
00101          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00102       return NULL;
00103    }
00104    s->fr.samples = fs->lastts;   /* XXX what ? */
00105    s->fr.datalen = len;
00106    s->fr.subclass |= mark;
00107    s->fr.delivery.tv_sec = 0;
00108    s->fr.delivery.tv_usec = 0;
00109    if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
00110       fs->lastts = ntohl(ts);
00111       *whennext = fs->lastts * 4/45;
00112    } else
00113       *whennext = 0;
00114    return &s->fr;
00115 }

static int h263_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 153 of file format_h263.c.

00154 {
00155    /* No way Jose */
00156    return -1;
00157 }

static off_t h263_tell ( struct ast_filestream fs  )  [static]

Definition at line 167 of file format_h263.c.

References ast_filestream::f, and offset.

00168 {
00169    off_t offset = ftello(fs->f);
00170    return offset; /* XXX totally bogus, needs fixing */
00171 }

static int h263_trunc ( struct ast_filestream fs  )  [static]

Definition at line 159 of file format_h263.c.

References ast_filestream::f.

00160 {
00161    /* Truncate file to current length */
00162    if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
00163       return -1;
00164    return 0;
00165 }

static int h263_write ( struct ast_filestream fs,
struct ast_frame f 
) [static]

Definition at line 117 of file format_h263.c.

References AST_FORMAT_H263, AST_FRAME_VIDEO, ast_log(), errno, ast_filestream::f, f, len(), and LOG_WARNING.

00118 {
00119    int res;
00120    unsigned int ts;
00121    unsigned short len;
00122    int subclass;
00123    int mark=0;
00124    if (f->frametype != AST_FRAME_VIDEO) {
00125       ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
00126       return -1;
00127    }
00128    subclass = f->subclass;
00129    if (subclass & 0x1)
00130       mark=0x8000;
00131    subclass &= ~0x1;
00132    if (subclass != AST_FORMAT_H263) {
00133       ast_log(LOG_WARNING, "Asked to write non-h263 frame (%d)!\n", f->subclass);
00134       return -1;
00135    }
00136    ts = htonl(f->samples);
00137    if ((res = fwrite(&ts, 1, sizeof(ts), fs->f)) != sizeof(ts)) {
00138          ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
00139          return -1;
00140    }
00141    len = htons(f->datalen | mark);
00142    if ((res = fwrite(&len, 1, sizeof(len), fs->f)) != sizeof(len)) {
00143          ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
00144          return -1;
00145    }
00146    if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
00147          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00148          return -1;
00149    }
00150    return 0;
00151 }

static int load_module ( void   )  [static]

Definition at line 187 of file format_h263.c.

References ast_format_register, and h263_f.

00188 {
00189    return ast_format_register(&h263_f);
00190 }

static int unload_module ( void   )  [static]

Definition at line 192 of file format_h263.c.

References ast_format_unregister(), h263_f, and ast_format::name.

00193 {
00194    return ast_format_unregister(h263_f.name);
00195 }  


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .description = "Raw H.263 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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, } [static]

Definition at line 200 of file format_h263.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 200 of file format_h263.c.

struct ast_format h263_f [static]

Definition at line 173 of file format_h263.c.

Referenced by load_module(), and unload_module().


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