Mon Mar 31 07:40:42 2008

Asterisk developer's documentation


format_h264.c File Reference

Save to raw, headerless h264 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"

Include dependency graph for format_h264.c:

Go to the source code of this file.

Data Structures

struct  h264_desc

Defines

#define BUF_SIZE   4096

Functions

 AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Raw H.264 data")
static int h264_open (struct ast_filestream *s)
static struct ast_frameh264_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_format h264_f


Detailed Description

Save to raw, headerless h264 data.

Definition in file format_h264.c.


Define Documentation

#define BUF_SIZE   4096

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

Definition at line 53 of file format_h264.c.


Function Documentation

AST_MODULE_INFO_STANDARD ( ASTERISK_GPL_KEY  ,
"Raw H.264 data"   
)

static int h264_open ( struct ast_filestream s  )  [static]

Definition at line 58 of file format_h264.c.

References ast_log(), LOG_WARNING, and s.

00059 {
00060    unsigned int ts;
00061    int res;
00062    if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
00063       ast_log(LOG_WARNING, "Empty file!\n");
00064       return -1;
00065    }
00066    return 0;
00067 }

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

Definition at line 69 of file format_h264.c.

References AST_FORMAT_H264, AST_FRAME_SET_BUFFER, AST_FRAME_VIDEO, AST_FRIENDLY_OFFSET, ast_log(), BUF_SIZE, errno, h264_desc::lastts, len, LOG_WARNING, s, and ast_frame::ts.

00070 {
00071    int res;
00072    int mark=0;
00073    unsigned short len;
00074    unsigned int ts;
00075    struct h264_desc *fs = (struct h264_desc *)s->_private;
00076 
00077    /* Send a frame from the file to the appropriate channel */
00078    if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
00079       return NULL;
00080    len = ntohs(len);
00081    mark = (len & 0x8000) ? 1 : 0;
00082    len &= 0x7fff;
00083    if (len > BUF_SIZE) {
00084       ast_log(LOG_WARNING, "Length %d is too long\n", len);
00085       len = BUF_SIZE;   /* XXX truncate */
00086    }
00087    s->fr.frametype = AST_FRAME_VIDEO;
00088    s->fr.subclass = AST_FORMAT_H264;
00089    s->fr.mallocd = 0;
00090    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
00091    if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00092       if (res)
00093          ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno));
00094       return NULL;
00095    }
00096    s->fr.samples = fs->lastts;
00097    s->fr.datalen = len;
00098    s->fr.subclass |= mark;
00099    s->fr.delivery.tv_sec = 0;
00100    s->fr.delivery.tv_usec = 0;
00101    if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
00102       fs->lastts = ntohl(ts);
00103       *whennext = fs->lastts * 4/45;
00104    } else
00105       *whennext = 0;
00106    return &s->fr;
00107 }

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

Definition at line 142 of file format_h264.c.

00143 {
00144    /* No way Jose */
00145    return -1;
00146 }

static off_t h264_tell ( struct ast_filestream fs  )  [static]

Definition at line 156 of file format_h264.c.

References ast_filestream::f, and offset.

00157 {
00158    off_t offset = ftell(fs->f);
00159    return offset; /* XXX totally bogus, needs fixing */
00160 }

static int h264_trunc ( struct ast_filestream fs  )  [static]

Definition at line 148 of file format_h264.c.

References ast_filestream::f.

00149 {
00150    /* Truncate file to current length */
00151    if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0)
00152       return -1;
00153    return 0;
00154 }

static int h264_write ( struct ast_filestream s,
struct ast_frame f 
) [static]

Definition at line 109 of file format_h264.c.

References AST_FORMAT_H264, AST_FRAME_VIDEO, ast_log(), errno, f, len, LOG_WARNING, and s.

00110 {
00111    int res;
00112    unsigned int ts;
00113    unsigned short len;
00114    int mark;
00115 
00116    if (f->frametype != AST_FRAME_VIDEO) {
00117       ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
00118       return -1;
00119    }
00120    mark = (f->subclass & 0x1) ? 0x8000 : 0;
00121    if ((f->subclass & ~0x1) != AST_FORMAT_H264) {
00122       ast_log(LOG_WARNING, "Asked to write non-h264 frame (%d)!\n", f->subclass);
00123       return -1;
00124    }
00125    ts = htonl(f->samples);
00126    if ((res = fwrite(&ts, 1, sizeof(ts), s->f)) != sizeof(ts)) {
00127       ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
00128       return -1;
00129    }
00130    len = htons(f->datalen | mark);
00131    if ((res = fwrite(&len, 1, sizeof(len), s->f)) != sizeof(len)) {
00132       ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
00133       return -1;
00134    }
00135    if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) {
00136       ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00137       return -1;
00138    }
00139    return 0;
00140 }

static int load_module ( void   )  [static]

Definition at line 176 of file format_h264.c.

References ast_format_register, and h264_f.

00177 {
00178    return ast_format_register(&h264_f);
00179 }

static int unload_module ( void   )  [static]

Definition at line 181 of file format_h264.c.

References ast_format_unregister(), h264_f, and ast_format::name.

00182 {
00183    return ast_format_unregister(h264_f.name);
00184 }  


Variable Documentation

struct ast_format h264_f [static]

Definition at line 162 of file format_h264.c.

Referenced by load_module(), and unload_module().


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