Wed Jan 8 2020 09:50:12

Asterisk developer's documentation


format_g719.c File Reference

ITU G.719 , 64kbps bitrate only. 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.

Macros

#define BUF_SIZE   160 /* 20 milliseconds == 160 bytes, 960 samples */
 
#define BYTES_TO_SAMPLES(x)   ((typeof(x)) x * ((float) 960 / 160))
 
#define SAMPLES_TO_BYTES(x)   ((typeof(x)) x / ((float) 960 / 160))
 

Functions

static void __reg_module (void)
 
static void __unreg_module (void)
 
static struct ast_frameg719read (struct ast_filestream *s, int *whennext)
 
static int g719seek (struct ast_filestream *fs, off_t sample_offset, int whence)
 
static off_t g719tell (struct ast_filestream *fs)
 
static int g719trunc (struct ast_filestream *fs)
 
static int g719write (struct ast_filestream *fs, 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 = "ITU G.719" , .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 g719_f
 

Detailed Description

ITU G.719 , 64kbps bitrate only.

  • File name extensions: g719

Definition in file format_g719.c.

Macro Definition Documentation

#define BUF_SIZE   160 /* 20 milliseconds == 160 bytes, 960 samples */

Definition at line 38 of file format_g719.c.

Referenced by g719read().

#define BYTES_TO_SAMPLES (   x)    ((typeof(x)) x * ((float) 960 / 160))

Definition at line 40 of file format_g719.c.

Referenced by g719read(), and g719tell().

#define SAMPLES_TO_BYTES (   x)    ((typeof(x)) x / ((float) 960 / 160))

Definition at line 39 of file format_g719.c.

Referenced by g719seek().

Function Documentation

static void __reg_module ( void  )
static

Definition at line 166 of file format_g719.c.

static void __unreg_module ( void  )
static

Definition at line 166 of file format_g719.c.

static struct ast_frame* g719read ( struct ast_filestream s,
int *  whennext 
)
static

Definition at line 42 of file format_g719.c.

References AST_FORMAT_G719, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, BYTES_TO_SAMPLES, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

43 {
44  int res;
45  /* Send a frame from the file to the appropriate channel */
46 
49  s->fr.mallocd = 0;
51  if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
52  if (res)
53  ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
54  return NULL;
55  }
56  *whennext = s->fr.samples = BYTES_TO_SAMPLES(res);
57  return &s->fr;
58 }
union ast_frame_subclass subclass
Definition: frame.h:146
#define BUF_SIZE
Definition: format_g719.c:38
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's data buffer.
Definition: frame.h:204
int datalen
Definition: frame.h:148
struct ast_frame fr
Definition: mod_format.h:117
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
int mallocd
Definition: frame.h:152
#define AST_FORMAT_G719
Definition: frame.h:299
enum ast_frame_type frametype
Definition: frame.h:144
union ast_frame::@172 data
#define BYTES_TO_SAMPLES(x)
Definition: format_g719.c:40
int samples
Definition: frame.h:150
static int g719seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
)
static

Definition at line 79 of file format_g719.c.

References ast_log(), AST_LOG_WARNING, errno, ast_filestream::f, ast_frame::offset, SAMPLES_TO_BYTES, and SEEK_FORCECUR.

80 {
81  off_t offset = 0, min = 0, cur, max;
82 
83  sample_offset = SAMPLES_TO_BYTES(sample_offset);
84 
85  if ((cur = ftello(fs->f)) < 0) {
86  ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
87  return -1;
88  }
89 
90  if (fseeko(fs->f, 0, SEEK_END) < 0) {
91  ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
92  return -1;
93  }
94 
95  if ((max = ftello(fs->f)) < 0) {
96  ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
97  return -1;
98  }
99 
100  if (whence == SEEK_SET)
101  offset = sample_offset;
102  else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
103  offset = sample_offset + cur;
104  else if (whence == SEEK_END)
105  offset = max - sample_offset;
106 
107  if (whence != SEEK_FORCECUR)
108  offset = (offset > max) ? max : offset;
109 
110  /* always protect against seeking past begining. */
111  offset = (offset < min) ? min : offset;
112 
113  return fseeko(fs->f, offset, SEEK_SET);
114 }
#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
#define SEEK_FORCECUR
Definition: file.h:50
#define SAMPLES_TO_BYTES(x)
Definition: format_g719.c:39
static off_t g719tell ( struct ast_filestream fs)
static

Definition at line 132 of file format_g719.c.

References BYTES_TO_SAMPLES, and ast_filestream::f.

133 {
134  return BYTES_TO_SAMPLES(ftello(fs->f));
135 }
#define BYTES_TO_SAMPLES(x)
Definition: format_g719.c:40
static int g719trunc ( struct ast_filestream fs)
static

Definition at line 116 of file format_g719.c.

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

117 {
118  int fd;
119  off_t cur;
120 
121  if ((fd = fileno(fs->f)) < 0) {
122  ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g719 filestream %p: %s\n", fs, strerror(errno));
123  return -1;
124  }
125  if ((cur = ftello(fs->f)) < 0) {
126  ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
127  return -1;
128  }
129  return ftruncate(fd, cur);
130 }
#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 g719write ( struct ast_filestream fs,
struct ast_frame f 
)
static

Definition at line 60 of file format_g719.c.

References AST_FORMAT_G719, AST_FRAME_VOICE, ast_getformatname(), ast_log(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.

61 {
62  int res;
63 
64  if (f->frametype != AST_FRAME_VOICE) {
65  ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
66  return -1;
67  }
68  if (f->subclass.codec != AST_FORMAT_G719) {
69  ast_log(LOG_WARNING, "Asked to write non-G.719 frame (%s)!\n", ast_getformatname(f->subclass.codec));
70  return -1;
71  }
72  if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
73  ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
74  return -1;
75  }
76  return 0;
77 }
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
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
#define AST_FORMAT_G719
Definition: frame.h:299
enum ast_frame_type frametype
Definition: frame.h:144
union ast_frame::@172 data
static int load_module ( void  )
static

Definition at line 149 of file format_g719.c.

References ast_format_register, AST_MODULE_LOAD_DECLINE, and AST_MODULE_LOAD_SUCCESS.

150 {
153 
155 }
#define ast_format_register(f)
Definition: mod_format.h:131
static struct ast_format g719_f
Definition: format_g719.c:137
static int unload_module ( void  )
static

Definition at line 157 of file format_g719.c.

References ast_format_unregister(), and ast_format::name.

158 {
160 }
int ast_format_unregister(const char *name)
Unregisters a file format.
Definition: file.c:104
char name[80]
Definition: mod_format.h:44
static struct ast_format g719_f
Definition: format_g719.c:137

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "ITU G.719" , .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 166 of file format_g719.c.

Definition at line 166 of file format_g719.c.

struct ast_format g719_f
static

Definition at line 137 of file format_g719.c.