Wed Jan 8 2020 09:50:12

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
 

Macros

#define BUF_SIZE   4096 /* Two Real h264 Frames */
 

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 = "ac1f6a56484a8820659555499174e588" , .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.

  • File name extension: h264

Definition in file format_h264.c.

Macro Definition Documentation

#define BUF_SIZE   4096 /* Two Real h264 Frames */
Todo:
Check this buf size estimate, it may be totally wrong for large frame video

Definition at line 44 of file format_h264.c.

Referenced by h264_read().

Function Documentation

static void __reg_module ( void  )
static

Definition at line 192 of file format_h264.c.

static void __unreg_module ( void  )
static

Definition at line 192 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.

50 {
51  unsigned int ts;
52  int res;
53  if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) {
54  ast_log(LOG_WARNING, "Empty file!\n");
55  return -1;
56  }
57  return 0;
58 }
#define LOG_WARNING
Definition: logger.h:144
void ast_log(int level, const char *file, int line, const char *function, const char *fmt,...)
Used for sending a log message This is the standard logger function. Probably the only way you will i...
Definition: logger.c:1207
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, if(), h264_desc::lastts, len(), LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, ast_frame::subclass, and ast_frame::ts.

61 {
62  int res;
63  int mark=0;
64  unsigned short len;
65  unsigned int ts;
66  struct h264_desc *fs = (struct h264_desc *)s->_private;
67 
68  /* Send a frame from the file to the appropriate channel */
69  if ((res = fread(&len, 1, sizeof(len), s->f)) < 1)
70  return NULL;
71  len = ntohs(len);
72  mark = (len & 0x8000) ? 1 : 0;
73  len &= 0x7fff;
74  if (len > BUF_SIZE) {
75  ast_log(LOG_WARNING, "Length %d is too long\n", len);
76  len = BUF_SIZE; /* XXX truncate */
77  }
80  s->fr.mallocd = 0;
82  if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
83  if (res)
84  ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno));
85  return NULL;
86  }
87  s->fr.samples = fs->lastts;
88  s->fr.datalen = len;
89  s->fr.subclass.codec |= mark;
90  s->fr.delivery.tv_sec = 0;
91  s->fr.delivery.tv_usec = 0;
92  if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) {
93  fs->lastts = ntohl(ts);
94  *whennext = fs->lastts * 4/45;
95  } else
96  *whennext = 0;
97  return &s->fr;
98 }
union ast_frame_subclass subclass
Definition: frame.h:146
#define BUF_SIZE
Definition: format_h264.c:44
void * ptr
Definition: frame.h:160
#define LOG_WARNING
Definition: logger.h:144
format_t codec
Definition: frame.h:137
#define AST_FRAME_SET_BUFFER(fr, _base, _ofs, _datalen)
Definition: frame.h:183
#define AST_FRIENDLY_OFFSET
Offset into a frame&#39;s data buffer.
Definition: frame.h:204
int datalen
Definition: frame.h:148
struct ast_frame fr
Definition: mod_format.h:117
void * _private
Definition: mod_format.h:119
static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
void ast_log(int level, const char *file, int line, const char *function, const char *fmt,...)
Used for sending a log message This is the standard logger function. Probably the only way you will i...
Definition: logger.c:1207
unsigned int lastts
Definition: format_h264.c:46
int errno
if(yyss+yystacksize-1<=yyssp)
Definition: ast_expr2.c:1874
struct timeval delivery
Definition: frame.h:162
int mallocd
Definition: frame.h:152
enum ast_frame_type frametype
Definition: frame.h:144
#define AST_FORMAT_H264
Definition: frame.h:287
union ast_frame::@172 data
int samples
Definition: frame.h:150
static int h264_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
)
static

Definition at line 133 of file format_h264.c.

134 {
135  /* No way Jose */
136  return -1;
137 }
static off_t h264_tell ( struct ast_filestream fs)
static

Definition at line 156 of file format_h264.c.

References ast_filestream::f.

157 {
158  off_t offset = ftell(fs->f);
159  return offset; /* XXX totally bogus, needs fixing */
160 }
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.

140 {
141  int fd;
142  off_t cur;
143 
144  if ((fd = fileno(fs->f)) < 0) {
145  ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for h264 filestream %p: %s\n", fs, strerror(errno));
146  return -1;
147  }
148  if ((cur = ftello(fs->f)) < 0) {
149  ast_log(AST_LOG_WARNING, "Unable to determine current position in h264 filestream %p: %s\n", fs, strerror(errno));
150  return -1;
151  }
152  /* Truncate file to current length */
153  return ftruncate(fd, cur);
154 }
#define AST_LOG_WARNING
Definition: logger.h:149
void ast_log(int level, const char *file, int line, const char *function, const char *fmt,...)
Used for sending a log message This is the standard logger function. Probably the only way you will i...
Definition: logger.c:1207
int errno
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.

101 {
102  int res;
103  unsigned int ts;
104  unsigned short len;
105  int mark;
106 
107  if (f->frametype != AST_FRAME_VIDEO) {
108  ast_log(LOG_WARNING, "Asked to write non-video frame!\n");
109  return -1;
110  }
111  mark = (f->subclass.codec & 0x1) ? 0x8000 : 0;
112  if ((f->subclass.codec & ~0x1) != AST_FORMAT_H264) {
113  ast_log(LOG_WARNING, "Asked to write non-h264 frame (%s)!\n", ast_getformatname(f->subclass.codec));
114  return -1;
115  }
116  ts = htonl(f->samples);
117  if ((res = fwrite(&ts, 1, sizeof(ts), s->f)) != sizeof(ts)) {
118  ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno));
119  return -1;
120  }
121  len = htons(f->datalen | mark);
122  if ((res = fwrite(&len, 1, sizeof(len), s->f)) != sizeof(len)) {
123  ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno));
124  return -1;
125  }
126  if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
127  ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
128  return -1;
129  }
130  return 0;
131 }
union ast_frame_subclass subclass
Definition: frame.h:146
void * ptr
Definition: frame.h:160
#define LOG_WARNING
Definition: logger.h:144
format_t codec
Definition: frame.h:137
int datalen
Definition: frame.h:148
char * ast_getformatname(format_t format)
Get the name of a format.
Definition: frame.c:578
static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
void ast_log(int level, const char *file, int line, const char *function, const char *fmt,...)
Used for sending a log message This is the standard logger function. Probably the only way you will i...
Definition: logger.c:1207
int errno
enum ast_frame_type frametype
Definition: frame.h:144
#define AST_FORMAT_H264
Definition: frame.h:287
union ast_frame::@172 data
int samples
Definition: frame.h:150
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.

177 {
181 }
#define ast_format_register(f)
Definition: mod_format.h:131
static struct ast_format h264_f
Definition: format_h264.c:162
static int unload_module ( void  )
static

Definition at line 183 of file format_h264.c.

References ast_format_unregister(), and ast_format::name.

184 {
186 }
static struct ast_format h264_f
Definition: format_h264.c:162
int ast_format_unregister(const char *name)
Unregisters a file format.
Definition: file.c:104
char name[80]
Definition: mod_format.h:44

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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static

Definition at line 192 of file format_h264.c.

Definition at line 192 of file format_h264.c.

struct ast_format h264_f
static

Definition at line 162 of file format_h264.c.