Wed Aug 18 22:34:23 2010

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 = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, .load_pri = 10, }
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 40 of file format_h264.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 179 of file format_h264.c.

static void __unreg_module ( void   )  [static]

Definition at line 179 of file format_h264.c.

static int h264_open ( struct ast_filestream s  )  [static]

Definition at line 45 of file format_h264.c.

References ast_log(), LOG_WARNING, and s.

00046 {
00047    unsigned int ts;
00048    int res;
00049    if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
00050       ast_log(LOG_WARNING, "Empty file!\n");
00051       return -1;
00052    }
00053    return 0;
00054 }

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

Definition at line 56 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.

00057 {
00058    int res;
00059    int mark=0;
00060    unsigned short len;
00061    unsigned int ts;
00062    struct h264_desc *fs = (struct h264_desc *)s->_private;
00063 
00064    /* Send a frame from the file to the appropriate channel */
00065    if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
00066       return NULL;
00067    len = ntohs(len);
00068    mark = (len & 0x8000) ? 1 : 0;
00069    len &= 0x7fff;
00070    if (len > BUF_SIZE) {
00071       ast_log(LOG_WARNING, "Length %d is too long\n", len);
00072       len = BUF_SIZE;   /* XXX truncate */
00073    }
00074    s->fr.frametype = AST_FRAME_VIDEO;
00075    s->fr.subclass = AST_FORMAT_H264;
00076    s->fr.mallocd = 0;
00077    AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len);
00078    if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
00079       if (res)
00080          ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno));
00081       return NULL;
00082    }
00083    s->fr.samples = fs->lastts;
00084    s->fr.datalen = len;
00085    s->fr.subclass |= mark;
00086    s->fr.delivery.tv_sec = 0;
00087    s->fr.delivery.tv_usec = 0;
00088    if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
00089       fs->lastts = ntohl(ts);
00090       *whennext = fs->lastts * 4/45;
00091    } else
00092       *whennext = 0;
00093    return &s->fr;
00094 }

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

Definition at line 129 of file format_h264.c.

00130 {
00131    /* No way Jose */
00132    return -1;
00133 }

static off_t h264_tell ( struct ast_filestream fs  )  [static]

Definition at line 143 of file format_h264.c.

References ast_filestream::f.

00144 {
00145    off_t offset = ftell(fs->f);
00146    return offset; /* XXX totally bogus, needs fixing */
00147 }

static int h264_trunc ( struct ast_filestream fs  )  [static]

Definition at line 135 of file format_h264.c.

References ast_filestream::f.

00136 {
00137    /* Truncate file to current length */
00138    if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0)
00139       return -1;
00140    return 0;
00141 }

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

Definition at line 96 of file format_h264.c.

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

00097 {
00098    int res;
00099    unsigned int ts;
00100    unsigned short len;
00101    int mark;
00102 
00103    if (f->frametype != AST_FRAME_VIDEO) {
00104       ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
00105       return -1;
00106    }
00107    mark = (f->subclass & 0x1) ? 0x8000 : 0;
00108    if ((f->subclass & ~0x1) != AST_FORMAT_H264) {
00109       ast_log(LOG_WARNING, "Asked to write non-h264 frame (%d)!\n", f->subclass);
00110       return -1;
00111    }
00112    ts = htonl(f->samples);
00113    if ((res = fwrite(&ts, 1, sizeof(ts), s->f)) != sizeof(ts)) {
00114       ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
00115       return -1;
00116    }
00117    len = htons(f->datalen | mark);
00118    if ((res = fwrite(&len, 1, sizeof(len), s->f)) != sizeof(len)) {
00119       ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
00120       return -1;
00121    }
00122    if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
00123       ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
00124       return -1;
00125    }
00126    return 0;
00127 }

static int load_module ( void   )  [static]

Definition at line 163 of file format_h264.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and h264_f.

00164 {
00165    if (ast_format_register(&h264_f))
00166       return AST_MODULE_LOAD_FAILURE;
00167    return AST_MODULE_LOAD_SUCCESS;
00168 }

static int unload_module ( void   )  [static]

Definition at line 170 of file format_h264.c.

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

00171 {
00172    return ast_format_unregister(h264_f.name);
00173 }  


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 = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, .load_pri = 10, } [static]

Definition at line 179 of file format_h264.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 179 of file format_h264.c.

struct ast_format h264_f [static]

Definition at line 149 of file format_h264.c.

Referenced by load_module(), and unload_module().


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