Wed Jan 8 2020 09:50:12

Asterisk developer's documentation


format_sln.c File Reference

RAW SLINEAR Format. 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   320 /* 320 bytes, 160 samples */
 
#define SLIN_SAMPLES   160
 

Functions

static void __reg_module (void)
 
static void __unreg_module (void)
 
static int load_module (void)
 
static struct ast_frameslinear_read (struct ast_filestream *s, int *whennext)
 
static int slinear_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
 
static off_t slinear_tell (struct ast_filestream *fs)
 
static int slinear_trunc (struct ast_filestream *fs)
 
static int slinear_write (struct ast_filestream *fs, struct ast_frame *f)
 
static int unload_module (void)
 

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw Signed Linear Audio support (SLN)" , .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 slin_f
 

Detailed Description

RAW SLINEAR Format.

  • File name extensions: sln, raw

Definition in file format_sln.c.

Macro Definition Documentation

#define BUF_SIZE   320 /* 320 bytes, 160 samples */

Definition at line 37 of file format_sln.c.

Referenced by slinear_read().

#define SLIN_SAMPLES   160

Definition at line 38 of file format_sln.c.

Function Documentation

static void __reg_module ( void  )
static

Definition at line 162 of file format_sln.c.

static void __unreg_module ( void  )
static

Definition at line 162 of file format_sln.c.

static int load_module ( void  )
static

Definition at line 146 of file format_sln.c.

References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.

147 {
151 }
#define ast_format_register(f)
Definition: mod_format.h:131
static struct ast_format slin_f
Definition: format_sln.c:134
static struct ast_frame* slinear_read ( struct ast_filestream s,
int *  whennext 
)
static

Definition at line 40 of file format_sln.c.

References AST_FORMAT_SLINEAR, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, 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.

41 {
42  int res;
43  /* Send a frame from the file to the appropriate channel */
44 
47  s->fr.mallocd = 0;
49  if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
50  if (res)
51  ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
52  return NULL;
53  }
54  *whennext = s->fr.samples = res/2;
55  s->fr.datalen = res;
56  return &s->fr;
57 }
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
#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 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_SLINEAR
Definition: frame.h:254
enum ast_frame_type frametype
Definition: frame.h:144
union ast_frame::@172 data
int samples
Definition: frame.h:150
#define BUF_SIZE
Definition: format_sln.c:37
static int slinear_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
)
static

Definition at line 77 of file format_sln.c.

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

78 {
79  off_t offset=0, min = 0, cur, max;
80 
81  sample_offset <<= 1;
82 
83  if ((cur = ftello(fs->f)) < 0) {
84  ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
85  return -1;
86  }
87 
88  if (fseeko(fs->f, 0, SEEK_END) < 0) {
89  ast_log(AST_LOG_WARNING, "Unable to seek to end of sln filestream %p: %s\n", fs, strerror(errno));
90  return -1;
91  }
92 
93  if ((max = ftello(fs->f)) < 0) {
94  ast_log(AST_LOG_WARNING, "Unable to determine max position in sln filestream %p: %s\n", fs, strerror(errno));
95  return -1;
96  }
97 
98  if (whence == SEEK_SET)
99  offset = sample_offset;
100  else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
101  offset = sample_offset + cur;
102  else if (whence == SEEK_END)
103  offset = max - sample_offset;
104  if (whence != SEEK_FORCECUR) {
105  offset = (offset > max)?max:offset;
106  }
107  /* always protect against seeking past begining. */
108  offset = (offset < min)?min:offset;
109  return fseeko(fs->f, offset, SEEK_SET);
110 }
#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
static off_t slinear_tell ( struct ast_filestream fs)
static

Definition at line 129 of file format_sln.c.

References ast_filestream::f.

130 {
131  return ftello(fs->f) / 2;
132 }
static int slinear_trunc ( struct ast_filestream fs)
static

Definition at line 112 of file format_sln.c.

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

113 {
114  int fd;
115  off_t cur;
116 
117  if ((fd = fileno(fs->f)) < 0) {
118  ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for sln filestream %p: %s\n", fs, strerror(errno));
119  return -1;
120  }
121  if ((cur = ftello(fs->f)) < 0) {
122  ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
123  return -1;
124  }
125  /* Truncate file to current length */
126  return ftruncate(fd, cur);
127 }
#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 slinear_write ( struct ast_filestream fs,
struct ast_frame f 
)
static

Definition at line 59 of file format_sln.c.

References AST_FORMAT_SLINEAR, 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.

60 {
61  int res;
62  if (f->frametype != AST_FRAME_VOICE) {
63  ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
64  return -1;
65  }
66  if (f->subclass.codec != AST_FORMAT_SLINEAR) {
67  ast_log(LOG_WARNING, "Asked to write non-slinear frame (%s)!\n", ast_getformatname(f->subclass.codec));
68  return -1;
69  }
70  if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
71  ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
72  return -1;
73  }
74  return 0;
75 }
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_SLINEAR
Definition: frame.h:254
enum ast_frame_type frametype
Definition: frame.h:144
union ast_frame::@172 data
static int unload_module ( void  )
static

Definition at line 153 of file format_sln.c.

References ast_format_unregister(), and ast_format::name.

154 {
156 }
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 slin_f
Definition: format_sln.c:134

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw Signed Linear Audio support (SLN)" , .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 162 of file format_sln.c.

Definition at line 162 of file format_sln.c.

struct ast_format slin_f
static

Definition at line 134 of file format_sln.c.