Thu Apr 28 2011 17:13:55

Asterisk developer's documentation

Data Structures | Defines | Functions | Variables

format_h264.c File Reference
Module: Media File Formats

Save to raw, headerless h264 data. More...

#include "asterisk.h"
#include "asterisk/mod_format.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

static void __reg_module (void)
static void __unreg_module (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
__MODULE_INFO_SECTION 		__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw H.264 data" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = 10, }
static struct ast_module_info * ast_module_info = &__mod_info
static struct ast_format h264_f

Detailed Description

Save to raw, headerless h264 data.

  • File name extension: h264

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.

Referenced by h264_read().

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(), ast_filestream::f, and LOG_WARNING.

{
   unsigned int ts;
   int res;
   if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
      ast_log(LOG_WARNING, "Empty file!\n");
      return -1;
   }
   return 0;
}
static struct ast_frame* h264_read ( struct ast_filestream *  s,
int *  whennext 
) [static, read]

Definition at line 56 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::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.

{
   int 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)) < 1)
      return NULL;
   len = ntohs(len);
   mark = (len & 0x8000) ? 1 : 0;
   len &= 0x7fff;
   if (len > BUF_SIZE) {
      ast_log(LOG_WARNING, "Length %d is too long\n", len);
      len = BUF_SIZE;   /* XXX truncate */
   }
   s->fr.frametype = AST_FRAME_VIDEO;
   s->fr.subclass = AST_FORMAT_H264;
   s->fr.mallocd = 0;
   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 (%d of %d) (%s)!\n", res, len, strerror(errno));
      return NULL;
   }
   s->fr.samples = fs->lastts;
   s->fr.datalen = len;
   s->fr.subclass |= mark;
   s->fr.delivery.tv_sec = 0;
   s->fr.delivery.tv_usec = 0;
   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;
}
static int h264_seek ( struct ast_filestream *  fs,
off_t  sample_offset,
int  whence 
) [static]

Definition at line 129 of file format_h264.c.

{
   /* No way Jose */
   return -1;
}
static off_t h264_tell ( struct ast_filestream *  fs) [static]

Definition at line 143 of file format_h264.c.

References ast_filestream::f.

{
   off_t offset = ftell(fs->f);
   return offset; /* XXX totally bogus, needs fixing */
}
static int h264_trunc ( struct ast_filestream *  fs) [static]

Definition at line 135 of file format_h264.c.

References ast_filestream::f.

{
   /* Truncate file to current length */
   if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0)
      return -1;
   return 0;
}
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(), ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, fwrite, len(), LOG_WARNING, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

{
   int res;
   unsigned int ts;
   unsigned short len;
   int mark;

   if (f->frametype != AST_FRAME_VIDEO) {
      ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
      return -1;
   }
   mark = (f->subclass & 0x1) ? 0x8000 : 0;
   if ((f->subclass & ~0x1) != AST_FORMAT_H264) {
      ast_log(LOG_WARNING, "Asked to write non-h264 frame (%d)!\n", f->subclass);
      return -1;
   }
   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;
}
static int load_module ( void  ) [static]

Definition at line 163 of file format_h264.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

{
   if (ast_format_register(&h264_f))
      return AST_MODULE_LOAD_FAILURE;
   return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module ( void  ) [static]

Definition at line 170 of file format_h264.c.

References ast_format_unregister(), and ast_format::name.

{
   return ast_format_unregister(h264_f.name);
}

Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw H.264 data" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .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.