#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 = "ac1f6a56484a8820659555499174e588" , .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 211 of file format_gsm.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 211 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(), AST_LOG_WARNING, errno, ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, LOG_WARNING, ast_frame::offset, and SEEK_FORCECUR.
00110 { 00111 off_t offset = 0, min = 0, cur, max, distance; 00112 00113 if ((cur = ftello(fs->f)) < 0) { 00114 ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno)); 00115 return -1; 00116 } 00117 00118 if (fseeko(fs->f, 0, SEEK_END) < 0) { 00119 ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno)); 00120 return -1; 00121 } 00122 00123 if ((max = ftello(fs->f)) < 0) { 00124 ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno)); 00125 return -1; 00126 } 00127 00128 /* have to fudge to frame here, so not fully to sample */ 00129 distance = (sample_offset / GSM_SAMPLES) * GSM_FRAME_SIZE; 00130 if (whence == SEEK_SET) { 00131 offset = distance; 00132 } else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) { 00133 offset = distance + cur; 00134 } else if (whence == SEEK_END) { 00135 offset = max - distance; 00136 } 00137 00138 /* Always protect against seeking past the begining. */ 00139 offset = (offset < min)?min:offset; 00140 if (whence != SEEK_FORCECUR) { 00141 offset = (offset > max)?max:offset; 00142 } else if (offset > max) { 00143 int i; 00144 fseeko(fs->f, 0, SEEK_END); 00145 for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) { 00146 if (!fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f)) { 00147 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); 00148 } 00149 } 00150 } 00151 return fseeko(fs->f, offset, SEEK_SET); 00152 }
static off_t gsm_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 171 of file format_gsm.c.
References ast_log(), AST_LOG_WARNING, errno, ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, and ast_frame::offset.
00172 { 00173 off_t offset = ftello(fs->f); 00174 00175 if (offset < 0) { 00176 ast_log(AST_LOG_WARNING, "Unable to determine offset for gsm filestream %p: %s\n", fs, strerror(errno)); 00177 return 0; 00178 } 00179 00180 return (offset / GSM_FRAME_SIZE) * GSM_SAMPLES; 00181 }
static int gsm_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 154 of file format_gsm.c.
References ast_log(), AST_LOG_WARNING, errno, and ast_filestream::f.
00155 { 00156 int fd; 00157 off_t cur; 00158 00159 if ((fd = fileno(fs->f)) < 0) { 00160 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for gsm filestream %p: %s\n", fs, strerror(errno)); 00161 return -1; 00162 } 00163 if ((cur = ftello(fs->f)) < 0) { 00164 ast_log(AST_LOG_WARNING, "Unable to determine current position in gsm filestream %p: %s\n", fs, strerror(errno)); 00165 return -1; 00166 } 00167 /* Truncate file to current length */ 00168 return ftruncate(fd, cur); 00169 }
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 195 of file format_gsm.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, and gsm_f.
00196 { 00197 if (ast_format_register(&gsm_f)) 00198 return AST_MODULE_LOAD_FAILURE; 00199 return AST_MODULE_LOAD_SUCCESS; 00200 }
static int unload_module | ( | void | ) | [static] |
Definition at line 202 of file format_gsm.c.
References ast_format_unregister(), gsm_f, and ast_format::name.
00203 { 00204 return ast_format_unregister(gsm_f.name); 00205 }
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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND } [static] |
Definition at line 211 of file format_gsm.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 211 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.