format_h264.c File Reference

Save to raw, headerless h264 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_h264.c:

Go to the source code of this file.

Data Structures
struct	h264_desc

Macros
#define	BUF_SIZE   4096 /* Two Real h264 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	h264_open (struct ast_filestream *s)
static struct ast_frame *	h264_read (struct ast_filestream *s, int *whennext)
static int	h264_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
static off_t	h264_tell (struct ast_filestream *fs)
static int	h264_trunc (struct ast_filestream *fs)
static int	h264_write (struct ast_filestream *s, 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.264 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	h264_f

Detailed Description

Save to raw, headerless h264 data.

• File name extension: h264

• See Video support in Asterisk

Definition in file format_h264.c.

Macro Definition Documentation

BUF_SIZE

#define BUF_SIZE   4096 /* Two Real h264 Frames */

Definition at line 45 of file format_h264.c.

FRAME_ENDED

#define FRAME_ENDED   0x8000

Todo:

Check this buf size estimate, it may be totally wrong for large frame video

Definition at line 43 of file format_h264.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 183 of file format_h264.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 183 of file format_h264.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 183 of file format_h264.c.

h264_open()

static int h264_open ( struct ast_filestream *  s )

static

Definition at line 50 of file format_h264.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.

h264_read()

static struct ast_frame * h264_read ( struct ast_filestream *  s, int *  whennext  )

static

Definition at line 60 of file format_h264.c.

{
    size_t res;
    int mark = 0;
    unsigned short len;
    unsigned int ts;
    struct h264_desc *fs = (struct h264_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);
        len = BUF_SIZE; /* XXX truncate */
    }
    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;
    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(), h264_desc::lastts, len(), LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, and ast_frame::ts.

h264_seek()

static int h264_seek ( struct ast_filestream *  fs, off_t  sample_offset, int  whence  )

static

Definition at line 123 of file format_h264.c.

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

h264_tell()

static off_t h264_tell ( struct ast_filestream *  fs )

static

Definition at line 146 of file format_h264.c.

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

References ast_filestream::f.

h264_trunc()

static int h264_trunc ( struct ast_filestream *  fs )

static

Definition at line 129 of file format_h264.c.

{
    int fd;
    off_t cur;
 
    if ((fd = fileno(fs->f)) < 0) {
        ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h264 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 h264 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.

h264_write()

static int h264_write ( struct ast_filestream *  s, struct ast_frame *  f  )

static

Definition at line 98 of file format_h264.c.

{
    int res;
    unsigned int ts;
    unsigned short len;
    int mark;
 
    mark = f->subclass.frame_ending ? FRAME_ENDED : 0;
    ts = htonl(f->samples);
    if ((res = fwrite(&ts, 1, sizeof(ts), s->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), s->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, s->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 165 of file format_h264.c.

{
    h264_f.format = ast_format_h264;
    if (ast_format_def_register(&h264_f))
        return AST_MODULE_LOAD_DECLINE;
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_format_def_register, ast_format_h264, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and h264_f.

unload_module()

static int unload_module ( void  )

static

Definition at line 173 of file format_h264.c.

{
    return ast_format_def_unregister(h264_f.name);
}

References ast_format_def_unregister(), h264_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.264 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 183 of file format_h264.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 183 of file format_h264.c.

h264_f

struct ast_format_def h264_f

static

Definition at line 152 of file format_h264.c.

Referenced by load_module(), and unload_module().