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"
#include "asterisk/format_cache.h"

Include dependency graph for format_h263.c:

Go to the source code of this file.

Data Structures
struct	h263_desc

Macros
#define	BUF_SIZE   32768 /* Four real h.263 Frames */
#define	FRAME_ENDED   0x8000

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	h263_open (struct ast_filestream *s)
static struct ast_frame *	h263_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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_format_def	h263_f

Detailed Description

Save to raw, headerless h263 data.

• File name extension: h263

• See Video support in Asterisk

Definition in file format_h263.c.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   32768 /* Four real h.263 Frames */

Definition at line 48 of file format_h263.c.

FRAME_ENDED

#define FRAME_ENDED   0x8000

Definition at line 50 of file format_h263.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 190 of file format_h263.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 190 of file format_h263.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 190 of file format_h263.c.

h263_open()

static int h263_open ( struct ast_filestream *  s )

static

Definition at line 57 of file format_h263.c.

{
    unsigned int ts;
 
    if (fread(&ts, 1, sizeof(ts), s->f) != sizeof(ts)) {
        ast_log(LOG_WARNING, "Empty file!\n");
        return -1;
    }
    return 0;
}

References ast_log, ast_filestream::f, and LOG_WARNING.

h263_read()

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

static

Definition at line 68 of file format_h263.c.

{
    size_t res;
    uint32_t mark;
    unsigned short len;
    unsigned int ts;
    struct h263_desc *fs = (struct h263_desc *)s->_private;
 
    /* Send a frame from the file to the appropriate channel */
    if ((res = fread(&len, 1, sizeof(len), s->f)) != sizeof(len))
        return NULL;
    len = ntohs(len);
    mark = (len & FRAME_ENDED) ? 1 : 0;
    len &= 0x7fff;
    if (len > BUF_SIZE) {
        ast_log(LOG_WARNING, "Length %d is too long\n", len);
        return NULL;
    }
    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
        if (res) {
            ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
                    ast_format_get_name(s->fr.subclass.format), s->fr.datalen, res,
                    strerror(errno));
        }
        return NULL;
    }
    s->fr.samples = fs->lastts; /* XXX what ? */
    s->fr.datalen = len;
    s->fr.subclass.frame_ending = mark;
    if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
        fs->lastts = ntohl(ts);
        *whennext = fs->lastts * 4/45;
    } else
        *whennext = 0;
    return &s->fr;
}

References ast_filestream::_private, ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, FRAME_ENDED, ast_frame_subclass::frame_ending, if(), h263_desc::lastts, len(), LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, and ast_frame::ts.

h263_seek()

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

static

Definition at line 130 of file format_h263.c.

{
    /* No way Jose */
    return -1;
}

h263_tell()

static off_t h263_tell ( struct ast_filestream *  fs )

static

Definition at line 153 of file format_h263.c.

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

References ast_filestream::f.

h263_trunc()

static int h263_trunc ( struct ast_filestream *  fs )

static

Definition at line 136 of file format_h263.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h263 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    if ((cur = ftello(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine current position in h263 filestream %p: %s\n", fs, strerror(errno));
        return -1;
    }
    /* Truncate file to current length */
    return ftruncate(fd, cur);
}

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

h263_write()

static int h263_write ( struct ast_filestream *  fs, struct ast_frame *  f  )

static

Definition at line 106 of file format_h263.c.

{
    int res;
    unsigned int ts;
    unsigned short len;
    uint32_t mark = 0;
    mark = f->subclass.frame_ending ? FRAME_ENDED : 0;
    ts = htonl(f->samples);
    if ((res = fwrite(&ts, 1, sizeof(ts), fs->f)) != sizeof(ts)) {
            ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
            return -1;
    }
    len = htons(f->datalen | mark);
    if ((res = fwrite(&len, 1, sizeof(len), fs->f)) != sizeof(len)) {
            ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
            return -1;
    }
    if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
            ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
            return -1;
    }
    return 0;
}

References ast_log, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, FRAME_ENDED, ast_frame_subclass::frame_ending, len(), LOG_WARNING, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

load_module()

static int load_module ( void  )

static

Definition at line 172 of file format_h263.c.

{
    h263_f.format = ast_format_h263;
    if (ast_format_def_register(&h263_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_def_register, ast_format_h263, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and h263_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 180 of file format_h263.c.

{
    return ast_format_def_unregister(h263_f.name);
}

References ast_format_def_unregister(), h263_f, and ast_format_def::name.

Variable Documentation

__mod_info

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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }

static

Definition at line 190 of file format_h263.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 190 of file format_h263.c.

h263_f

struct ast_format_def h263_f

static

Definition at line 159 of file format_h263.c.

Referenced by load_module(), and unload_module().