#include "asterisk.h"
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/sched.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 | |
AST_MODULE_INFO_STANDARD (ASTERISK_GPL_KEY,"Raw GSM data") | |
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_format | gsm_f |
char | gsm_silence [] |
Definition in file format_gsm.c.
#define GSM_FRAME_SIZE 33 |
Definition at line 53 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 54 of file format_gsm.c.
AST_MODULE_INFO_STANDARD | ( | ASTERISK_GPL_KEY | , | |
"Raw GSM data" | ||||
) |
static struct ast_frame* gsm_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static] |
Definition at line 64 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.
00065 { 00066 int res; 00067 00068 s->fr.frametype = AST_FRAME_VOICE; 00069 s->fr.subclass = AST_FORMAT_GSM; 00070 AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE) 00071 s->fr.mallocd = 0; 00072 if ((res = fread(s->fr.data, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) { 00073 if (res) 00074 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); 00075 return NULL; 00076 } 00077 *whennext = s->fr.samples = GSM_SAMPLES; 00078 return &s->fr; 00079 }
static int gsm_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 118 of file format_gsm.c.
References ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, offset, and SEEK_FORCECUR.
00119 { 00120 off_t offset=0,min,cur,max,distance; 00121 00122 min = 0; 00123 cur = ftello(fs->f); 00124 fseeko(fs->f, 0, SEEK_END); 00125 max = ftello(fs->f); 00126 /* have to fudge to frame here, so not fully to sample */ 00127 distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE; 00128 if(whence == SEEK_SET) 00129 offset = distance; 00130 else if(whence == SEEK_CUR || whence == SEEK_FORCECUR) 00131 offset = distance + cur; 00132 else if(whence == SEEK_END) 00133 offset = max - distance; 00134 /* Always protect against seeking past the begining. */ 00135 offset = (offset < min)?min:offset; 00136 if (whence != SEEK_FORCECUR) { 00137 offset = (offset > max)?max:offset; 00138 } else if (offset > max) { 00139 int i; 00140 fseeko(fs->f, 0, SEEK_END); 00141 for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) { 00142 fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f); 00143 } 00144 } 00145 return fseeko(fs->f, offset, SEEK_SET); 00146 }
static off_t gsm_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 153 of file format_gsm.c.
References ast_filestream::f, GSM_FRAME_SIZE, GSM_SAMPLES, and offset.
00154 { 00155 off_t offset = ftello(fs->f); 00156 return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES; 00157 }
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 81 of file format_gsm.c.
References AST_FORMAT_GSM, AST_FRAME_VOICE, ast_log(), conv65(), ast_frame::datalen, errno, ast_filestream::f, f, GSM_FRAME_SIZE, len, and LOG_WARNING.
00082 { 00083 int res; 00084 unsigned char gsm[2*GSM_FRAME_SIZE]; 00085 00086 if (f->frametype != AST_FRAME_VOICE) { 00087 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); 00088 return -1; 00089 } 00090 if (f->subclass != AST_FORMAT_GSM) { 00091 ast_log(LOG_WARNING, "Asked to write non-GSM frame (%d)!\n", f->subclass); 00092 return -1; 00093 } 00094 if (!(f->datalen % 65)) { 00095 /* This is in MSGSM format, need to be converted */ 00096 int len=0; 00097 while(len < f->datalen) { 00098 conv65(f->data + len, gsm); 00099 if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) { 00100 ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno)); 00101 return -1; 00102 } 00103 len += 65; 00104 } 00105 } else { 00106 if (f->datalen % GSM_FRAME_SIZE) { 00107 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen); 00108 return -1; 00109 } 00110 if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) { 00111 ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno)); 00112 return -1; 00113 } 00114 } 00115 return 0; 00116 }
static int load_module | ( | void | ) | [static] |
Definition at line 171 of file format_gsm.c.
References ast_format_register, and gsm_f.
00172 { 00173 return ast_format_register(&gsm_f); 00174 }
static int unload_module | ( | void | ) | [static] |
Definition at line 176 of file format_gsm.c.
References ast_format_unregister(), gsm_f, and ast_format::name.
00177 { 00178 return ast_format_unregister(gsm_f.name); 00179 }
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 58 of file format_gsm.c.