Sat Aug 6 00:39:56 2011

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"

Go to the source code of this file.

Data Structures

struct  h264_desc

Defines

#define BUF_SIZE   4096

Functions

static void __reg_module (void)
static void __unreg_module (void)
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_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, }
static const struct ast_module_infoast_module_info = &__mod_info
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

static void __reg_module ( void   )  [static]

Definition at line 189 of file format_h264.c.

static void __unreg_module ( void   )  [static]

Definition at line 189 of file format_h264.c.

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_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_FIRST | AST_MODFLAG_BUILDSUM, .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 = "361d7bb937402d51e4658efb5b4d76e4" , .load = load_module, .unload = unload_module, } [static]

Definition at line 189 of file format_h264.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 189 of file format_h264.c.

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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