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 = ASTERISK_GPL_KEY , .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, 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 = ASTERISK_GPL_KEY , .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.

                                      {
    .name = "h264",
    .exts = "h264",
    .open = h264_open,
    .write = h264_write,
    .seek = h264_seek,
    .trunc = h264_trunc,
    .tell = h264_tell,
    .read = h264_read,
    .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
    .desc_size = sizeof(struct h264_desc),
};

Referenced by load_module(), and unload_module().