#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "msgsm.h"
Go to the source code of this file.
Defines | |
#define | GSM_FRAME_SIZE 33 |
#define | GSM_SAMPLES 160 |
Functions | |
static void | __reg_module (void) |
static void | __unreg_module (void) |
static struct ast_frame * | gsm_read (struct ast_filestream *s, int *whennext) |
static int | gsm_seek (struct ast_filestream *fs, off_t sample_offset, int whence) |
static off_t | gsm_tell (struct ast_filestream *fs) |
static int | gsm_trunc (struct ast_filestream *fs) |
static int | gsm_write (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 = "Raw GSM 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 = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, .load_pri = 10, } |
static struct ast_module_info * | ast_module_info = &__mod_info |
static struct ast_format | gsm_f |
char | gsm_silence [] |
Definition in file format_gsm.c.
#define GSM_FRAME_SIZE 33 |
Definition at line 40 of file format_gsm.c.
Referenced by gsm_read(), gsm_seek(), gsm_tell(), gsm_write(), wav_read(), and wav_write().
#define GSM_SAMPLES 160 |
Definition at line 41 of file format_gsm.c.
static void __reg_module | ( | void | ) | [static] |
Definition at line 176 of file format_gsm.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 176 of file format_gsm.c.
static struct ast_frame* gsm_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static] |
Definition at line 51 of file format_gsm.c.
References AST_FORMAT_GSM, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), errno, GSM_FRAME_SIZE, GSM_SAMPLES, LOG_WARNING, and s.
00052 { 00053 int res; 00054 00055 s->fr.frametype = AST_FRAME_VOICE; 00056 s->fr.subclass = AST_FORMAT_GSM; 00057 AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE) 00058 s->fr.mallocd = 0; 00059 if ((res = fread(s->fr.data.ptr, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) { 00060 if (res) 00061 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); 00062 return NULL; 00063 } 00064 *whennext = s->fr.samples = GSM_SAMPLES; 00065 return &s->fr; 00066 }
static int gsm_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 105 of file format_gsm.c.
References ast_log(), errno, ast_filestream::f, fwrite, GSM_FRAME_SIZE, GSM_SAMPLES, LOG_WARNING, ast_frame::offset, and SEEK_FORCECUR.
00106 { 00107 off_t offset=0,min,cur,max,distance; 00108 00109 min = 0; 00110 cur = ftello(fs->f); 00111 fseeko(fs->f, 0, SEEK_END); 00112 max = ftello(fs->f); 00113 /* have to fudge to frame here, so not fully to sample */ 00114 distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE; 00115 if(whence == SEEK_SET) 00116 offset = distance; 00117 else if(whence == SEEK_CUR || whence == SEEK_FORCECUR) 00118 offset = distance + cur; 00119 else if(whence == SEEK_END) 00120 offset = max - distance; 00121 /* Always protect against seeking past the begining. */ 00122 offset = (offset < min)?min:offset; 00123 if (whence != SEEK_FORCECUR) { 00124 offset = (offset > max)?max:offset; 00125 } else if (offset > max) { 00126 int i; 00127 fseeko(fs->f, 0, SEEK_END); 00128 for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) { 00129 if (!fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f)) { 00130 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00131 } 00132 } 00133 } 00134 return fseeko(fs->f, offset, SEEK_SET); 00135 }
static off_t gsm_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 142 of file format_gsm.c.
References ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, and ast_frame::offset.
00143 { 00144 off_t offset = ftello(fs->f); 00145 return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES; 00146 }
static int gsm_trunc | ( | struct ast_filestream * | fs | ) | [static] |
static int gsm_write | ( | struct ast_filestream * | fs, | |
struct ast_frame * | f | |||
) | [static] |
Definition at line 68 of file format_gsm.c.
References AST_FORMAT_GSM, AST_FRAME_VOICE, ast_log(), conv65(), ast_frame::datalen, errno, ast_filestream::f, f, fwrite, GSM_FRAME_SIZE, len(), and LOG_WARNING.
00069 { 00070 int res; 00071 unsigned char gsm[2*GSM_FRAME_SIZE]; 00072 00073 if (f->frametype != AST_FRAME_VOICE) { 00074 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); 00075 return -1; 00076 } 00077 if (f->subclass != AST_FORMAT_GSM) { 00078 ast_log(LOG_WARNING, "Asked to write non-GSM frame (%d)!\n", f->subclass); 00079 return -1; 00080 } 00081 if (!(f->datalen % 65)) { 00082 /* This is in MSGSM format, need to be converted */ 00083 int len=0; 00084 while(len < f->datalen) { 00085 conv65(f->data.ptr + len, gsm); 00086 if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) { 00087 ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno)); 00088 return -1; 00089 } 00090 len += 65; 00091 } 00092 } else { 00093 if (f->datalen % GSM_FRAME_SIZE) { 00094 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen); 00095 return -1; 00096 } 00097 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) { 00098 ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno)); 00099 return -1; 00100 } 00101 } 00102 return 0; 00103 }
static int load_module | ( | void | ) | [static] |
Definition at line 160 of file format_gsm.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and gsm_f.
00161 { 00162 if (ast_format_register(&gsm_f)) 00163 return AST_MODULE_LOAD_FAILURE; 00164 return AST_MODULE_LOAD_SUCCESS; 00165 }
static int unload_module | ( | void | ) | [static] |
Definition at line 167 of file format_gsm.c.
References ast_format_unregister(), gsm_f, and ast_format::name.
00168 { 00169 return ast_format_unregister(gsm_f.name); 00170 }
struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw GSM 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 = "a9c98e5d177805051735cb5b0b16b0a0" , .load = load_module, .unload = unload_module, .load_pri = 10, } [static] |
Definition at line 176 of file format_gsm.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 176 of file format_gsm.c.
struct ast_format gsm_f [static] |
char gsm_silence[] |
Initial value:
{0xD8,0x20,0xA2,0xE1,0x5A,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49 ,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24 ,0x92,0x49,0x24}
Definition at line 45 of file format_gsm.c.