Mon Oct 8 12:39:22 2012

Asterisk developer's documentation


format_h263.c File Reference

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

#include "asterisk.h"
#include "asterisk/mod_format.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_ORDER , .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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static 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 49 of file format_h263.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 203 of file format_h263.c.

static void __unreg_module ( void   )  [static]

Definition at line 203 of file format_h263.c.

static int h263_open ( struct ast_filestream s  )  [static]

Definition at line 56 of file format_h263.c.

References ast_log(), ast_filestream::f, and LOG_WARNING.

00057 {
00058    unsigned int ts;
00059    int res;
00060 
00061    if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
00062       ast_log(LOG_WARNING, "Empty file!\n");
00063       return -1;
00064    }
00065    return 0;
00066 }

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

Definition at line 68 of file format_h263.c.

References ast_filestream::_private, AST_FORMAT_H263, AST_FRAME_SET_BUFFER, AST_FRAME_VIDEO, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, ast_frame::delivery, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, h263_desc::lastts, len(), LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, and ast_frame::ts.

00069 {
00070    int res;
00071    format_t mark;
00072    unsigned short len;
00073    unsigned int ts;
00074    struct h263_desc *fs = (struct h263_desc *)s->_private;
00075 
00076    /* Send a frame from the file to the appropriate channel */
00077    if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
00078       return NULL;
00079    len = ntohs(len);
00080    mark = (len & 0x8000) ? 1 : 0;
00081    len &= 0x7fff;
00082    if (len > BUF_SIZE) {
00083       ast_log(LOG_WARNING, "Length %d is too long\n", len);
00084       return NULL;
00085    }
00086    s->fr.frametype = AST_FRAME_VIDEO;
00087    s->fr.subclass.codec = AST_FORMAT_H263;
00088    s->fr.mallocd = 0;
00089    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
00090    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00091       if (res)
00092          ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00093       return NULL;
00094    }
00095    s->fr.samples = fs->lastts;   /* XXX what ? */
00096    s->fr.datalen = len;
00097    s->fr.subclass.codec |= mark;
00098    s->fr.delivery.tv_sec = 0;
00099    s->fr.delivery.tv_usec = 0;
00100    if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
00101       fs->lastts = ntohl(ts);
00102       *whennext = fs->lastts * 4/45;
00103    } else
00104       *whennext = 0;
00105    return &s->fr;
00106 }

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

Definition at line 144 of file format_h263.c.

00145 {
00146    /* No way Jose */
00147    return -1;
00148 }

static off_t h263_tell ( struct ast_filestream fs  )  [static]

Definition at line 167 of file format_h263.c.

References ast_filestream::f.

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 150 of file format_h263.c.

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

00151 {
00152    int fd;
00153    off_t cur;
00154 
00155    if ((fd = fileno(fs->f)) < 0) {
00156       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h263 filestream %p: %s\n", fs, strerror(errno));
00157       return -1;
00158    }
00159    if ((cur = ftello(fs->f)) < 0) {
00160       ast_log(AST_LOG_WARNING, "Unable to determine current position in h263 filestream %p: %s\n", fs, strerror(errno));
00161       return -1;
00162    }
00163    /* Truncate file to current length */
00164    return ftruncate(fd, cur);
00165 }

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

Definition at line 108 of file format_h263.c.

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

00109 {
00110    int res;
00111    unsigned int ts;
00112    unsigned short len;
00113    format_t subclass;
00114    format_t mark=0;
00115    if (f->frametype != AST_FRAME_VIDEO) {
00116       ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
00117       return -1;
00118    }
00119    subclass = f->subclass.codec;
00120    if (subclass & 0x1)
00121       mark=0x8000;
00122    subclass &= ~0x1;
00123    if (subclass != AST_FORMAT_H263) {
00124       ast_log(LOG_WARNING, "Asked to write non-h263 frame (%s)!\n", ast_getformatname(f->subclass.codec));
00125       return -1;
00126    }
00127    ts = htonl(f->samples);
00128    if ((res = fwrite(&ts, 1, sizeof(ts), fs->f)) != sizeof(ts)) {
00129          ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
00130          return -1;
00131    }
00132    len = htons(f->datalen | mark);
00133    if ((res = fwrite(&len, 1, sizeof(len), fs->f)) != sizeof(len)) {
00134          ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
00135          return -1;
00136    }
00137    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
00138          ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00139          return -1;
00140    }
00141    return 0;
00142 }

static int load_module ( void   )  [static]

Definition at line 187 of file format_h263.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and h263_f.

00188 {
00189    if (ast_format_register(&h263_f))
00190       return AST_MODULE_LOAD_FAILURE;
00191    return AST_MODULE_LOAD_SUCCESS;
00192 }

static int unload_module ( void   )  [static]

Definition at line 194 of file format_h263.c.

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

00195 {
00196    return ast_format_unregister(h263_f.name);
00197 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 203 of file format_h263.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 203 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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