Asterisk - The Open Source Telephony Project  GIT-master-0190e70
format_sln.c
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1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2005, Anthony Minessale
5  * Anthony Minessale (anthmct@yahoo.com)
6  *
7  * See http://www.asterisk.org for more information about
8  * the Asterisk project. Please do not directly contact
9  * any of the maintainers of this project for assistance;
10  * the project provides a web site, mailing lists and IRC
11  * channels for your use.
12  *
13  * This program is free software, distributed under the terms of
14  * the GNU General Public License Version 2. See the LICENSE file
15  * at the top of the source tree.
16  */
17 
18 /*! \file
19  *
20  * \brief RAW SLINEAR Formats
21  * \ingroup formats
22  */
23 
24 /*** MODULEINFO
25  <support_level>core</support_level>
26  ***/
27 
28 #include "asterisk.h"
29 
30 #include "asterisk/mod_format.h"
31 #include "asterisk/module.h"
32 #include "asterisk/endian.h"
33 #include "asterisk/format_cache.h"
34 
35 static struct ast_frame *generic_read(struct ast_filestream *s, int *whennext, unsigned int buf_size)
36 {
37  size_t res;
38 
39  /* Send a frame from the file to the appropriate channel */
40  AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, buf_size);
41  if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
42  if (res) {
43  ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
45  strerror(errno));
46  }
47  return NULL;
48  }
49  *whennext = s->fr.samples = res/2;
50  s->fr.datalen = res;
51  return &s->fr;
52 }
53 
54 static int slinear_write(struct ast_filestream *fs, struct ast_frame *f)
55 {
56  int res;
57 
58  /* Don't try to write an interpolated frame */
59  if (f->datalen == 0) {
60  return 0;
61  }
62 
63  if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
64  ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
65  return -1;
66  }
67  return 0;
68 }
69 
70 static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
71 {
72  off_t offset=0, min = 0, cur, max;
73 
74  sample_offset <<= 1;
75 
76  if ((cur = ftello(fs->f)) < 0) {
77  ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
78  return -1;
79  }
80 
81  if (fseeko(fs->f, 0, SEEK_END) < 0) {
82  ast_log(AST_LOG_WARNING, "Unable to seek to end of sln filestream %p: %s\n", fs, strerror(errno));
83  return -1;
84  }
85 
86  if ((max = ftello(fs->f)) < 0) {
87  ast_log(AST_LOG_WARNING, "Unable to determine max position in sln filestream %p: %s\n", fs, strerror(errno));
88  return -1;
89  }
90 
91  if (whence == SEEK_SET)
92  offset = sample_offset;
93  else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
94  offset = sample_offset + cur;
95  else if (whence == SEEK_END)
96  offset = max - sample_offset;
97  if (whence != SEEK_FORCECUR) {
98  offset = (offset > max)?max:offset;
99  }
100  /* always protect against seeking past begining. */
101  offset = (offset < min)?min:offset;
102  return fseeko(fs->f, offset, SEEK_SET);
103 }
104 
105 static int slinear_trunc(struct ast_filestream *fs)
106 {
107  int fd;
108  off_t cur;
109 
110  if ((fd = fileno(fs->f)) < 0) {
111  ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for sln filestream %p: %s\n", fs, strerror(errno));
112  return -1;
113  }
114  if ((cur = ftello(fs->f)) < 0) {
115  ast_log(AST_LOG_WARNING, "Unable to determine current position in sln filestream %p: %s\n", fs, strerror(errno));
116  return -1;
117  }
118  /* Truncate file to current length */
119  return ftruncate(fd, cur);
120 }
121 
122 static off_t slinear_tell(struct ast_filestream *fs)
123 {
124  return ftello(fs->f) / 2;
125 }
126 
127 static struct ast_frame *slinear_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 320);}
128 static struct ast_format_def slin_f = {
129  .name = "sln",
130  .exts = "sln|raw",
131  .write = slinear_write,
132  .seek = slinear_seek,
133  .trunc = slinear_trunc,
134  .tell = slinear_tell,
135  .read = slinear_read,
136  .buf_size = 320 + AST_FRIENDLY_OFFSET,
137 };
138 
139 static struct ast_frame *slinear12_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 480);}
140 static struct ast_format_def slin12_f = {
141  .name = "sln12",
142  .exts = "sln12",
143  .write = slinear_write,
144  .seek = slinear_seek,
145  .trunc = slinear_trunc,
146  .tell = slinear_tell,
147  .read = slinear12_read,
148  .buf_size = 480 + AST_FRIENDLY_OFFSET,
149 };
150 
151 static struct ast_frame *slinear16_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 640);}
152 static struct ast_format_def slin16_f = {
153  .name = "sln16",
154  .exts = "sln16",
155  .write = slinear_write,
156  .seek = slinear_seek,
157  .trunc = slinear_trunc,
158  .tell = slinear_tell,
159  .read = slinear16_read,
160  .buf_size = 640 + AST_FRIENDLY_OFFSET,
161 };
162 
163 static struct ast_frame *slinear24_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 960);}
164 static struct ast_format_def slin24_f = {
165  .name = "sln24",
166  .exts = "sln24",
167  .write = slinear_write,
168  .seek = slinear_seek,
169  .trunc = slinear_trunc,
170  .tell = slinear_tell,
171  .read = slinear24_read,
172  .buf_size = 960 + AST_FRIENDLY_OFFSET,
173 };
174 
175 static struct ast_frame *slinear32_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 1280);}
176 static struct ast_format_def slin32_f = {
177  .name = "sln32",
178  .exts = "sln32",
179  .write = slinear_write,
180  .seek = slinear_seek,
181  .trunc = slinear_trunc,
182  .tell = slinear_tell,
183  .read = slinear32_read,
184  .buf_size = 1280 + AST_FRIENDLY_OFFSET,
185 };
186 
187 static struct ast_frame *slinear44_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 1764);}
188 static struct ast_format_def slin44_f = {
189  .name = "sln44",
190  .exts = "sln44",
191  .write = slinear_write,
192  .seek = slinear_seek,
193  .trunc = slinear_trunc,
194  .tell = slinear_tell,
195  .read = slinear44_read,
196  .buf_size = 1764 + AST_FRIENDLY_OFFSET,
197 };
198 
199 static struct ast_frame *slinear48_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 1920);}
200 static struct ast_format_def slin48_f = {
201  .name = "sln48",
202  .exts = "sln48",
203  .write = slinear_write,
204  .seek = slinear_seek,
205  .trunc = slinear_trunc,
206  .tell = slinear_tell,
207  .read = slinear48_read,
208  .buf_size = 1920 + AST_FRIENDLY_OFFSET,
209 };
210 
211 static struct ast_frame *slinear96_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 3840);}
212 static struct ast_format_def slin96_f = {
213  .name = "sln96",
214  .exts = "sln96",
215  .write = slinear_write,
216  .seek = slinear_seek,
217  .trunc = slinear_trunc,
218  .tell = slinear_tell,
219  .read = slinear96_read,
220  .buf_size = 3840 + AST_FRIENDLY_OFFSET,
221 };
222 
223 static struct ast_frame *slinear192_read(struct ast_filestream *s, int *whennext){return generic_read(s, whennext, 7680);}
224 static struct ast_format_def slin192_f = {
225  .name = "sln192",
226  .exts = "sln192",
227  .write = slinear_write,
228  .seek = slinear_seek,
229  .trunc = slinear_trunc,
230  .tell = slinear_tell,
231  .read = slinear192_read,
232  .buf_size = 7680 + AST_FRIENDLY_OFFSET,
233 };
234 
235 static struct ast_format_def *slin_list[] = {
236  &slin_f,
237  &slin12_f,
238  &slin16_f,
239  &slin24_f,
240  &slin32_f,
241  &slin44_f,
242  &slin48_f,
243  &slin96_f,
244  &slin192_f,
245 };
246 
247 static int unload_module(void)
248 {
249  int res = 0;
250  int i = 0;
251 
252  for (i = 0; i < ARRAY_LEN(slin_list); i++) {
253  if (ast_format_def_unregister(slin_list[i]->name)) {
254  res = -1;
255  }
256  }
257  return res;
258 }
259 
260 static int load_module(void)
261 {
262  int i;
263 
264  slin_f.format = ast_format_slin;
265  slin12_f.format = ast_format_slin12;
266  slin16_f.format = ast_format_slin16;
267  slin24_f.format = ast_format_slin24;
268  slin32_f.format = ast_format_slin32;
269  slin44_f.format = ast_format_slin44;
270  slin48_f.format = ast_format_slin48;
271  slin96_f.format = ast_format_slin96;
272  slin192_f.format = ast_format_slin192;
273 
274  for (i = 0; i < ARRAY_LEN(slin_list); i++) {
275  if (ast_format_def_register(slin_list[i])) {
276  unload_module();
278  }
279  }
280 
282 }
283 
284 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Raw Signed Linear Audio support (SLN) 8khz-192khz",
285  .support_level = AST_MODULE_SUPPORT_CORE,
286  .load = load_module,
287  .unload = unload_module,
288  .load_pri = AST_MODPRI_APP_DEPEND
289 );
static struct ast_frame * slinear24_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:163
Asterisk main include file. File version handling, generic pbx functions.
static struct ast_frame * generic_read(struct ast_filestream *s, int *whennext, unsigned int buf_size)
Definition: format_sln.c:35
#define ARRAY_LEN(a)
Definition: isdn_lib.c:42
struct ast_format * ast_format_slin192
Built-in cached signed linear 192kHz format.
Definition: format_cache.c:81
static struct ast_frame * slinear44_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:187
static int load_module(void)
Definition: format_sln.c:260
struct ast_format * ast_format_slin32
Built-in cached signed linear 32kHz format.
Definition: format_cache.c:61
struct ast_format * ast_format_slin96
Built-in cached signed linear 96kHz format.
Definition: format_cache.c:76
static struct ast_frame * slinear_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:127
#define LOG_WARNING
Definition: logger.h:274
static struct ast_frame * slinear32_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:175
union ast_frame::@257 data
#define AST_LOG_WARNING
Definition: logger.h:279
static struct ast_format_def * slin_list[]
Definition: format_sln.c:235
struct ast_format * ast_format_slin24
Built-in cached signed linear 24kHz format.
Definition: format_cache.c:56
static struct ast_format_def slin_f
Definition: format_sln.c:128
const char * ast_format_get_name(const struct ast_format *format)
Get the name associated with a format.
Definition: format.c:334
#define NULL
Definition: resample.c:96
static struct ast_format_def slin48_f
Definition: format_sln.c:200
Each supported file format is described by the following structure.
Definition: mod_format.h:43
static struct ast_frame * slinear192_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:223
static int unload_module(void)
Definition: format_sln.c:247
struct ast_frame_subclass subclass
Header for providers of file and format handling routines. Clients of these routines should include "...
static struct ast_frame * slinear48_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:199
int ast_format_def_unregister(const char *name)
Unregisters a file format.
Definition: file.c:162
struct ast_format * ast_format_slin12
Built-in cached signed linear 12kHz format.
Definition: format_cache.c:46
#define ast_log
Definition: astobj2.c:42
#define AST_FRIENDLY_OFFSET
Offset into a frame&#39;s data buffer.
static struct ast_format_def slin12_f
Definition: format_sln.c:140
static struct ast_frame * slinear96_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:211
Asterisk architecture endianess compatibility definitions.
#define ast_format_def_register(f)
Definition: mod_format.h:136
static struct ast_format_def slin96_f
Definition: format_sln.c:212
struct ast_frame fr
frame produced by read, typically
Definition: mod_format.h:122
struct ast_format * format
Definition: mod_format.h:48
static off_t slinear_tell(struct ast_filestream *fs)
Definition: format_sln.c:122
#define AST_FRAME_SET_BUFFER(fr, _base, _ofs, _datalen)
static struct ast_format_def slin16_f
Definition: format_sln.c:152
int errno
char name[80]
Definition: mod_format.h:44
#define SEEK_FORCECUR
Definition: file.h:51
static const char name[]
Definition: cdr_mysql.c:74
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS|AST_MODFLAG_LOAD_ORDER, "HTTP Phone Provisioning",.support_level=AST_MODULE_SUPPORT_EXTENDED,.load=load_module,.unload=unload_module,.reload=reload,.load_pri=AST_MODPRI_CHANNEL_DEPEND,.requires="http",)
This structure is allocated by file.c in one chunk, together with buf_size and desc_size bytes of mem...
Definition: mod_format.h:101
static struct ast_frame * slinear16_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:151
static int slinear_trunc(struct ast_filestream *fs)
Definition: format_sln.c:105
static struct ast_format_def slin44_f
Definition: format_sln.c:188
Data structure associated with a single frame of data.
static int slinear_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
Definition: format_sln.c:70
struct ast_format * ast_format_slin44
Built-in cached signed linear 44kHz format.
Definition: format_cache.c:66
struct ast_format * ast_format_slin16
Built-in cached signed linear 16kHz format.
Definition: format_cache.c:51
struct ast_format * format
static struct ast_format_def slin192_f
Definition: format_sln.c:224
static int slinear_write(struct ast_filestream *fs, struct ast_frame *f)
Definition: format_sln.c:54
#define ASTERISK_GPL_KEY
The text the key() function should return.
Definition: module.h:46
static struct ast_format_def slin24_f
Definition: format_sln.c:164
struct ast_format * ast_format_slin
Built-in cached signed linear 8kHz format.
Definition: format_cache.c:41
Asterisk module definitions.
#define min(a, b)
Definition: f2c.h:197
static struct ast_frame * slinear12_read(struct ast_filestream *s, int *whennext)
Definition: format_sln.c:139
struct ast_format * ast_format_slin48
Built-in cached signed linear 48kHz format.
Definition: format_cache.c:71
Media Format Cache API.
static struct ast_format_def slin32_f
Definition: format_sln.c:176
#define max(a, b)
Definition: f2c.h:198