Save to raw, headerless GSM data. More...
#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 | |
AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Raw GSM data",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND) | |
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 |
static const char | gsm_silence [] |
Save to raw, headerless GSM data.
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.
AST_MODULE_INFO | ( | ASTERISK_GPL_KEY | , | |
AST_MODFLAG_LOAD_ORDER | , | |||
"Raw GSM data" | , | |||
. | load = load_module , |
|||
. | unload = unload_module , |
|||
. | load_pri = AST_MODPRI_APP_DEPEND | |||
) |
static struct ast_frame* gsm_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static, read] |
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(), ast_frame_subclass::codec, conv65(), ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, GSM_FRAME_SIZE, len(), LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.
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, and AST_MODULE_LOAD_SUCCESS.
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(), and ast_format::name.
00203 { 00204 return ast_format_unregister(gsm_f.name); 00205 }
struct ast_format gsm_f [static] |
Definition at line 183 of file format_gsm.c.
const char gsm_silence[] [static] |
{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.