Thu Sep 7 01:03:29 2017

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

 AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Raw H.264 data",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND)
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 44 of file format_h264.c.


Function Documentation

AST_MODULE_INFO ( ASTERISK_GPL_KEY  ,
AST_MODFLAG_LOAD_ORDER  ,
"Raw H.264 data"  ,
load = load_module,
unload = unload_module,
load_pri = AST_MODPRI_APP_DEPEND 
)
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, read]

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 156 of file format_h264.c.

References ast_filestream::f.

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 139 of file format_h264.c.

References ast_log(), AST_LOG_WARNING, errno, and ast_filestream::f.

00140 {
00141    int fd;
00142    off_t cur;
00143 
00144    if ((fd = fileno(fs->f)) < 0) {
00145       ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h264 filestream %p: %s\n", fs, strerror(errno));
00146       return -1;
00147    }
00148    if ((cur = ftello(fs->f)) < 0) {
00149       ast_log(AST_LOG_WARNING, "Unable to determine current position in h264 filestream %p: %s\n", fs, strerror(errno));
00150       return -1;
00151    }
00152    /* Truncate file to current length */
00153    return ftruncate(fd, cur);
00154 }

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(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, len(), LOG_WARNING, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

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 176 of file format_h264.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

00177 {
00178    if (ast_format_register(&h264_f))
00179       return AST_MODULE_LOAD_FAILURE;
00180    return AST_MODULE_LOAD_SUCCESS;
00181 }

static int unload_module ( void   )  [static]

Definition at line 183 of file format_h264.c.

References ast_format_unregister(), and ast_format::name.

00184 {
00185    return ast_format_unregister(h264_f.name);
00186 }


Variable Documentation

struct ast_format h264_f [static]

Definition at line 162 of file format_h264.c.


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