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269 lines
6.4 KiB
269 lines
6.4 KiB
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Save to raw, headerless GSM data.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/file.h"
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#include "asterisk/logger.h"
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#include "asterisk/sched.h"
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#include "asterisk/module.h"
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#include "asterisk/endian.h"
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include "msgsm.h"
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/* Some Ideas for this code came from makegsme.c by Jeffrey Chilton */
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/* Portions of the conversion code are by guido@sienanet.it */
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/* silent gsm frame */
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/* begin binary data: */
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char gsm_silence[] = /* 33 */
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{0xD8,0x20,0xA2,0xE1,0x5A,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49
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,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24,0x92,0x49,0x24,0x50,0x00,0x49,0x24
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,0x92,0x49,0x24};
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/* end binary data. size = 33 bytes */
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struct ast_filestream {
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void *reserved[AST_RESERVED_POINTERS];
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/* Believe it or not, we must decode/recode to account for the
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weird MS format */
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/* This is what a filestream means to us */
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int fd; /* Descriptor */
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struct ast_frame fr; /* Frame information */
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char waste[AST_FRIENDLY_OFFSET]; /* Buffer for sending frames, etc */
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char empty; /* Empty character */
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unsigned char gsm[66]; /* Two Real GSM Frames */
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};
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AST_MUTEX_DEFINE_STATIC(gsm_lock);
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static int glistcnt = 0;
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static char *name = "gsm";
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static char *desc = "Raw GSM data";
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static char *exts = "gsm";
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static struct ast_filestream *gsm_open(int fd)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&gsm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock gsm list\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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tmp->fr.data = tmp->gsm;
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tmp->fr.frametype = AST_FRAME_VOICE;
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tmp->fr.subclass = AST_FORMAT_GSM;
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/* datalen will vary for each frame */
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tmp->fr.src = name;
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tmp->fr.mallocd = 0;
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glistcnt++;
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ast_mutex_unlock(&gsm_lock);
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ast_update_use_count();
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}
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return tmp;
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}
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static struct ast_filestream *gsm_rewrite(int fd, const char *comment)
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{
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/* We don't have any header to read or anything really, but
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if we did, it would go here. We also might want to check
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and be sure it's a valid file. */
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struct ast_filestream *tmp;
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if ((tmp = malloc(sizeof(struct ast_filestream)))) {
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memset(tmp, 0, sizeof(struct ast_filestream));
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if (ast_mutex_lock(&gsm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock gsm list\n");
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free(tmp);
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return NULL;
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}
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tmp->fd = fd;
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glistcnt++;
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ast_mutex_unlock(&gsm_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Out of memory\n");
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return tmp;
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}
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static void gsm_close(struct ast_filestream *s)
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{
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if (ast_mutex_lock(&gsm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock gsm list\n");
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return;
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}
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glistcnt--;
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ast_mutex_unlock(&gsm_lock);
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ast_update_use_count();
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close(s->fd);
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free(s);
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}
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static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext)
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{
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int res;
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s->fr.frametype = AST_FRAME_VOICE;
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s->fr.subclass = AST_FORMAT_GSM;
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s->fr.offset = AST_FRIENDLY_OFFSET;
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s->fr.samples = 160;
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s->fr.datalen = 33;
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s->fr.mallocd = 0;
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s->fr.data = s->gsm;
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if ((res = read(s->fd, s->gsm, 33)) != 33) {
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if (res)
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ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
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return NULL;
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}
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*whennext = 160;
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return &s->fr;
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}
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static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
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{
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int res;
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unsigned char gsm[66];
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if (f->frametype != AST_FRAME_VOICE) {
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ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
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return -1;
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}
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if (f->subclass != AST_FORMAT_GSM) {
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ast_log(LOG_WARNING, "Asked to write non-GSM frame (%d)!\n", f->subclass);
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return -1;
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}
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if (!(f->datalen % 65)) {
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/* This is in MSGSM format, need to be converted */
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int len=0;
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while(len < f->datalen) {
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conv65(f->data + len, gsm);
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if ((res = write(fs->fd, gsm, 66)) != 66) {
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ast_log(LOG_WARNING, "Bad write (%d/66): %s\n", res, strerror(errno));
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return -1;
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}
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len += 65;
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}
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} else {
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if (f->datalen % 33) {
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ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 33\n", f->datalen);
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return -1;
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}
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if ((res = write(fs->fd, f->data, f->datalen)) != f->datalen) {
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ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno));
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return -1;
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}
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}
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return 0;
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}
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static int gsm_seek(struct ast_filestream *fs, long sample_offset, int whence)
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{
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off_t offset=0,min,cur,max,distance;
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min = 0;
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cur = lseek(fs->fd, 0, SEEK_CUR);
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max = lseek(fs->fd, 0, SEEK_END);
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/* have to fudge to frame here, so not fully to sample */
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distance = (sample_offset/160) * 33;
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if(whence == SEEK_SET)
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offset = distance;
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else if(whence == SEEK_CUR || whence == SEEK_FORCECUR)
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offset = distance + cur;
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else if(whence == SEEK_END)
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offset = max - distance;
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/* Always protect against seeking past the begining. */
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offset = (offset < min)?min:offset;
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if (whence != SEEK_FORCECUR) {
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offset = (offset > max)?max:offset;
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} else if (offset > max) {
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int i;
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lseek(fs->fd, 0, SEEK_END);
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for (i=0; i< (offset - max) / 33; i++) {
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write(fs->fd, gsm_silence, 33);
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}
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}
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return lseek(fs->fd, offset, SEEK_SET);
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}
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static int gsm_trunc(struct ast_filestream *fs)
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{
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return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
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}
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static long gsm_tell(struct ast_filestream *fs)
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{
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off_t offset;
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offset = lseek(fs->fd, 0, SEEK_CUR);
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return (offset/33)*160;
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}
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static char *gsm_getcomment(struct ast_filestream *s)
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{
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return NULL;
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}
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int load_module()
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{
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return ast_format_register(name, exts, AST_FORMAT_GSM,
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gsm_open,
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gsm_rewrite,
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gsm_write,
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gsm_seek,
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gsm_trunc,
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gsm_tell,
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gsm_read,
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gsm_close,
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gsm_getcomment);
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}
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int unload_module()
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{
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return ast_format_unregister(name);
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}
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int usecount()
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{
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int res;
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if (ast_mutex_lock(&gsm_lock)) {
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ast_log(LOG_WARNING, "Unable to lock gsm list\n");
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return -1;
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}
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res = glistcnt;
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ast_mutex_unlock(&gsm_lock);
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return res;
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}
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char *description()
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{
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return desc;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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