Sat Mar 10 01:55:23 2012

Asterisk developer's documentation


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"

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_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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static 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 44 of file format_h264.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 183 of file format_h264.c.

static void __unreg_module ( void   )  [static]

Definition at line 183 of file format_h264.c.

static int h264_open ( struct ast_filestream s  )  [static]

Definition at line 49 of file format_h264.c.

References ast_log(), ast_filestream::f, and LOG_WARNING.

00050 {
00051    unsigned int ts;
00052    int res;
00053    if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
00054       ast_log(LOG_WARNING, "Empty file!\n");
00055       return -1;
00056    }
00057    return 0;
00058 }

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

Definition at line 60 of file format_h264.c.

References ast_filestream::_private, AST_FORMAT_H264, AST_FRAME_SET_BUFFER, AST_FRAME_VIDEO, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, ast_frame::delivery, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, h264_desc::lastts, len(), LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, and ast_frame::ts.

00061 {
00062    int res;
00063    int mark=0;
00064    unsigned short len;
00065    unsigned int ts;
00066    struct h264_desc *fs = (struct h264_desc *)s->_private;
00067 
00068    /* Send a frame from the file to the appropriate channel */
00069    if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
00070       return NULL;
00071    len = ntohs(len);
00072    mark = (len & 0x8000) ? 1 : 0;
00073    len &= 0x7fff;
00074    if (len > BUF_SIZE) {
00075       ast_log(LOG_WARNING, "Length %d is too long\n", len);
00076       len = BUF_SIZE;   /* XXX truncate */
00077    }
00078    s->fr.frametype = AST_FRAME_VIDEO;
00079    s->fr.subclass.codec = AST_FORMAT_H264;
00080    s->fr.mallocd = 0;
00081    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
00082    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00083       if (res)
00084          ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno));
00085       return NULL;
00086    }
00087    s->fr.samples = fs->lastts;
00088    s->fr.datalen = len;
00089    s->fr.subclass.codec |= mark;
00090    s->fr.delivery.tv_sec = 0;
00091    s->fr.delivery.tv_usec = 0;
00092    if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
00093       fs->lastts = ntohl(ts);
00094       *whennext = fs->lastts * 4/45;
00095    } else
00096       *whennext = 0;
00097    return &s->fr;
00098 }

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

Definition at line 133 of file format_h264.c.

00134 {
00135    /* No way Jose */
00136    return -1;
00137 }

static off_t h264_tell ( struct ast_filestream fs  )  [static]

Definition at line 147 of file format_h264.c.

References ast_filestream::f.

00148 {
00149    off_t offset = ftell(fs->f);
00150    return offset; /* XXX totally bogus, needs fixing */
00151 }

static int h264_trunc ( struct ast_filestream fs  )  [static]

Definition at line 139 of file format_h264.c.

References ast_filestream::f.

00140 {
00141    /* Truncate file to current length */
00142    if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0)
00143       return -1;
00144    return 0;
00145 }

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

Definition at line 100 of file format_h264.c.

References AST_FORMAT_H264, AST_FRAME_VIDEO, ast_getformatname(), ast_log(), errno, ast_filestream::f, f, len(), and LOG_WARNING.

00101 {
00102    int res;
00103    unsigned int ts;
00104    unsigned short len;
00105    int mark;
00106 
00107    if (f->frametype != AST_FRAME_VIDEO) {
00108       ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
00109       return -1;
00110    }
00111    mark = (f->subclass.codec & 0x1) ? 0x8000 : 0;
00112    if ((f->subclass.codec & ~0x1) != AST_FORMAT_H264) {
00113       ast_log(LOG_WARNING, "Asked to write non-h264 frame (%s)!\n", ast_getformatname(f->subclass.codec));
00114       return -1;
00115    }
00116    ts = htonl(f->samples);
00117    if ((res = fwrite(&ts, 1, sizeof(ts), s->f)) != sizeof(ts)) {
00118       ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
00119       return -1;
00120    }
00121    len = htons(f->datalen | mark);
00122    if ((res = fwrite(&len, 1, sizeof(len), s->f)) != sizeof(len)) {
00123       ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
00124       return -1;
00125    }
00126    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00127       ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00128       return -1;
00129    }
00130    return 0;
00131 }

static int load_module ( void   )  [static]

Definition at line 167 of file format_h264.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and h264_f.

00168 {
00169    if (ast_format_register(&h264_f))
00170       return AST_MODULE_LOAD_FAILURE;
00171    return AST_MODULE_LOAD_SUCCESS;
00172 }

static int unload_module ( void   )  [static]

Definition at line 174 of file format_h264.c.

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

00175 {
00176    return ast_format_unregister(h264_f.name);
00177 }


Variable Documentation

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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static]

Definition at line 183 of file format_h264.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 183 of file format_h264.c.

struct ast_format h264_f [static]

Definition at line 153 of file format_h264.c.

Referenced by load_module(), and unload_module().


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