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 | |
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 __MODULE_INFO_SECTION | __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw GSM data" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .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 [] |
#define GSM_FRAME_SIZE 33 |
Definition at line 40 of file format_gsm.c.
Referenced by gsm_read(), gsm_seek(), gsm_tell(), and gsm_write().
#define GSM_SAMPLES 160 |
Definition at line 41 of file format_gsm.c.
Referenced by gsm_read(), gsm_seek(), and gsm_tell().
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, read] |
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(), ast_filestream::buf, 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.
{ int res; s->fr.frametype = AST_FRAME_VOICE; s->fr.subclass = AST_FORMAT_GSM; AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE) s->fr.mallocd = 0; if ((res = fread(s->fr.data.ptr, 1, GSM_FRAME_SIZE, s->f)) != GSM_FRAME_SIZE) { if (res) ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); return NULL; } *whennext = s->fr.samples = GSM_SAMPLES; return &s->fr; }
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.
{ off_t offset=0,min,cur,max,distance; min = 0; cur = ftello(fs->f); fseeko(fs->f, 0, SEEK_END); max = ftello(fs->f); /* have to fudge to frame here, so not fully to sample */ distance = (sample_offset/GSM_SAMPLES) * GSM_FRAME_SIZE; if(whence == SEEK_SET) offset = distance; else if(whence == SEEK_CUR || whence == SEEK_FORCECUR) offset = distance + cur; else if(whence == SEEK_END) offset = max - distance; /* Always protect against seeking past the begining. */ offset = (offset < min)?min:offset; if (whence != SEEK_FORCECUR) { offset = (offset > max)?max:offset; } else if (offset > max) { int i; fseeko(fs->f, 0, SEEK_END); for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) { if (!fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f)) { ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno)); } } } return fseeko(fs->f, offset, SEEK_SET); }
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.
{ off_t offset = ftello(fs->f); return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES; }
static int gsm_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 137 of file format_gsm.c.
References ast_filestream::f.
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::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame::frametype, fwrite, GSM_FRAME_SIZE, len(), LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.
{ int res; unsigned char gsm[2*GSM_FRAME_SIZE]; if (f->frametype != AST_FRAME_VOICE) { ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); return -1; } if (f->subclass != AST_FORMAT_GSM) { ast_log(LOG_WARNING, "Asked to write non-GSM frame (%d)!\n", f->subclass); return -1; } if (!(f->datalen % 65)) { /* This is in MSGSM format, need to be converted */ int len=0; while(len < f->datalen) { conv65(f->data.ptr + len, gsm); if ((res = fwrite(gsm, 1, 2*GSM_FRAME_SIZE, fs->f)) != 2*GSM_FRAME_SIZE) { ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno)); return -1; } len += 65; } } else { if (f->datalen % GSM_FRAME_SIZE) { ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen); return -1; } if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) { ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno)); return -1; } } return 0; }
static int load_module | ( | void | ) | [static] |
Definition at line 160 of file format_gsm.c.
References ast_format_register, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
{ if (ast_format_register(&gsm_f)) return AST_MODULE_LOAD_FAILURE; return AST_MODULE_LOAD_SUCCESS; }
static int unload_module | ( | void | ) | [static] |
Definition at line 167 of file format_gsm.c.
References ast_format_unregister(), and ast_format::name.
{ return ast_format_unregister(gsm_f.name); }
struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw GSM data" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .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] |
Definition at line 148 of file format_gsm.c.
char gsm_silence[] |
{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.