#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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } |
static struct ast_module_info * | ast_module_info = &__mod_info |
static struct ast_format | gsm_f |
static const char | gsm_silence [] |
Definition in file format_gsm.c.
#define GSM_FRAME_SIZE 33 |
Definition at line 44 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 45 of file format_gsm.c.
static void __reg_module | ( | void | ) | [static] |
Definition at line 180 of file format_gsm.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 180 of file format_gsm.c.
static struct ast_frame* gsm_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static] |
Definition at line 55 of file format_gsm.c.
References AST_FORMAT_GSM, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, ast_frame_subclass::codec, ast_frame::data, errno, ast_filestream::f, ast_filestream::fr, ast_frame::frametype, GSM_FRAME_SIZE, GSM_SAMPLES, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.
00056 { 00057 int res; 00058 00059 s->fr.frametype = AST_FRAME_VOICE; 00060 s->fr.subclass.codec = AST_FORMAT_GSM; 00061 AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE) 00062 s->fr.mallocd = 0; 00063 if ((res = fread(s->fr.data.ptr, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) { 00064 if (res) 00065 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); 00066 return NULL; 00067 } 00068 *whennext = s->fr.samples = GSM_SAMPLES; 00069 return &s->fr; 00070 }
static int gsm_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 109 of file format_gsm.c.
References ast_log(), errno, ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, LOG_WARNING, ast_frame::offset, and SEEK_FORCECUR.
00110 { 00111 off_t offset=0,min,cur,max,distance; 00112 00113 min = 0; 00114 cur = ftello(fs->f); 00115 fseeko(fs->f, 0, SEEK_END); 00116 max = ftello(fs->f); 00117 /* have to fudge to frame here, so not fully to sample */ 00118 distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE; 00119 if(whence == SEEK_SET) 00120 offset = distance; 00121 else if(whence == SEEK_CUR || whence == SEEK_FORCECUR) 00122 offset = distance + cur; 00123 else if(whence == SEEK_END) 00124 offset = max - distance; 00125 /* Always protect against seeking past the begining. */ 00126 offset = (offset < min)?min:offset; 00127 if (whence != SEEK_FORCECUR) { 00128 offset = (offset > max)?max:offset; 00129 } else if (offset > max) { 00130 int i; 00131 fseeko(fs->f, 0, SEEK_END); 00132 for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) { 00133 if (!fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f)) { 00134 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00135 } 00136 } 00137 } 00138 return fseeko(fs->f, offset, SEEK_SET); 00139 }
static off_t gsm_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 146 of file format_gsm.c.
References ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, and ast_frame::offset.
00147 { 00148 off_t offset = ftello(fs->f); 00149 return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES; 00150 }
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 72 of file format_gsm.c.
References AST_FORMAT_GSM, AST_FRAME_VOICE, ast_getformatname(), ast_log(), conv65(), ast_frame::datalen, errno, ast_filestream::f, f, GSM_FRAME_SIZE, len(), and LOG_WARNING.
00073 { 00074 int res; 00075 unsigned char gsm[2*GSM_FRAME_SIZE]; 00076 00077 if (f->frametype != AST_FRAME_VOICE) { 00078 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); 00079 return -1; 00080 } 00081 if (f->subclass.codec != AST_FORMAT_GSM) { 00082 ast_log(LOG_WARNING, "Asked to write non-GSM frame (%s)!\n", ast_getformatname(f->subclass.codec)); 00083 return -1; 00084 } 00085 if (!(f->datalen % 65)) { 00086 /* This is in MSGSM format, need to be converted */ 00087 int len=0; 00088 while(len < f->datalen) { 00089 conv65(f->data.ptr + len, gsm); 00090 if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) { 00091 ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno)); 00092 return -1; 00093 } 00094 len += 65; 00095 } 00096 } else { 00097 if (f->datalen % GSM_FRAME_SIZE) { 00098 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen); 00099 return -1; 00100 } 00101 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) { 00102 ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno)); 00103 return -1; 00104 } 00105 } 00106 return 0; 00107 }
static int load_module | ( | void | ) | [static] |
Definition at line 164 of file format_gsm.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and gsm_f.
00165 { 00166 if (ast_format_register(&gsm_f)) 00167 return AST_MODULE_LOAD_FAILURE; 00168 return AST_MODULE_LOAD_SUCCESS; 00169 }
static int unload_module | ( | void | ) | [static] |
Definition at line 171 of file format_gsm.c.
References ast_format_unregister(), gsm_f, and ast_format::name.
00172 { 00173 return ast_format_unregister(gsm_f.name); 00174 }
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 = "88eaa8f5c1bd988bedd71113385e0886" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static] |
Definition at line 180 of file format_gsm.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 180 of file format_gsm.c.
struct ast_format gsm_f [static] |
const char gsm_silence[] [static] |
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 49 of file format_gsm.c.