Merged revisions 61863 via svnmerge from
[asterisk/asterisk.git] / formats / format_gsm.c
old mode 100755 (executable)
new mode 100644 (file)
index a51ee02..f997af1
@@ -1,41 +1,58 @@
 /*
- * Asterisk -- A telephony toolkit for Linux.
+ * Asterisk -- An open source telephony toolkit.
  *
- * Save to raw, headerless GSM data.
- * 
- * Copyright (C) 1999, Mark Spencer
+ * Copyright (C) 1999 - 2005, Digium, Inc.
  *
- * Mark Spencer <markster@linux-support.net>
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
  *
  * This program is free software, distributed under the terms of
- * the GNU General Public License
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Save to raw, headerless GSM data.
+ * \arg File name extension: gsm
+ * \ingroup formats
  */
  
-#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.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <unistd.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <stdlib.h>
 #include <sys/time.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <errno.h>
 #include <string.h>
-#ifdef __linux__
-#include <endian.h>
-#else
-#include <machine/endian.h>
-#endif
+
+#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"
 
 /* Some Ideas for this code came from makegsme.c by Jeffrey Chilton */
 
 /* Portions of the conversion code are by guido@sienanet.it */
 
+#define        GSM_FRAME_SIZE  33
+#define        GSM_SAMPLES     160
+
 /* silent gsm frame */
 /* begin binary data: */
 char gsm_silence[] = /* 33 */
@@ -44,111 +61,28 @@ char gsm_silence[] = /* 33 */
 ,0x92,0x49,0x24};
 /* end binary data. size = 33 bytes */
 
-struct ast_filestream {
-       void *reserved[AST_RESERVED_POINTERS];
-       /* Believe it or not, we must decode/recode to account for the
-          weird MS format */
-       /* This is what a filestream means to us */
-       int fd; /* Descriptor */
-       struct ast_frame fr;                            /* Frame information */
-       char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
-       char empty;                                                     /* Empty character */
-       unsigned char gsm[66];                          /* Two Real GSM Frames */
-};
-
-
-AST_MUTEX_DEFINE_STATIC(gsm_lock);
-static int glistcnt = 0;
-
-static char *name = "gsm";
-static char *desc = "Raw GSM data";
-static char *exts = "gsm";
-
-static struct ast_filestream *gsm_open(int fd)
-{
-       /* We don't have any header to read or anything really, but
-          if we did, it would go here.  We also might want to check
-          and be sure it's a valid file.  */
-       struct ast_filestream *tmp;
-       if ((tmp = malloc(sizeof(struct ast_filestream)))) {
-               memset(tmp, 0, sizeof(struct ast_filestream));
-               if (ast_mutex_lock(&gsm_lock)) {
-                       ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-                       free(tmp);
-                       return NULL;
-               }
-               tmp->fd = fd;
-               tmp->fr.data = tmp->gsm;
-               tmp->fr.frametype = AST_FRAME_VOICE;
-               tmp->fr.subclass = AST_FORMAT_GSM;
-               /* datalen will vary for each frame */
-               tmp->fr.src = name;
-               tmp->fr.mallocd = 0;
-               glistcnt++;
-               ast_mutex_unlock(&gsm_lock);
-               ast_update_use_count();
-       }
-       return tmp;
-}
-
-static struct ast_filestream *gsm_rewrite(int fd, const char *comment)
-{
-       /* We don't have any header to read or anything really, but
-          if we did, it would go here.  We also might want to check
-          and be sure it's a valid file.  */
-       struct ast_filestream *tmp;
-       if ((tmp = malloc(sizeof(struct ast_filestream)))) {
-               memset(tmp, 0, sizeof(struct ast_filestream));
-               if (ast_mutex_lock(&gsm_lock)) {
-                       ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-                       free(tmp);
-                       return NULL;
-               }
-               tmp->fd = fd;
-               glistcnt++;
-               ast_mutex_unlock(&gsm_lock);
-               ast_update_use_count();
-       } else
-               ast_log(LOG_WARNING, "Out of memory\n");
-       return tmp;
-}
-
-static void gsm_close(struct ast_filestream *s)
-{
-       if (ast_mutex_lock(&gsm_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-               return;
-       }
-       glistcnt--;
-       ast_mutex_unlock(&gsm_lock);
-       ast_update_use_count();
-       close(s->fd);
-       free(s);
-}
-
 static struct ast_frame *gsm_read(struct ast_filestream *s, int *whennext)
 {
        int res;
+
        s->fr.frametype = AST_FRAME_VOICE;
        s->fr.subclass = AST_FORMAT_GSM;
-       s->fr.offset = AST_FRIENDLY_OFFSET;
-       s->fr.samples = 160;
-       s->fr.datalen = 33;
+       AST_FRAME_SET_BUFFER(&(s->fr), s->buf, AST_FRIENDLY_OFFSET, GSM_FRAME_SIZE)
        s->fr.mallocd = 0;
-       s->fr.data = s->gsm;
-       if ((res = read(s->fd, s->gsm, 33)) != 33) {
+       if ((res = fread(s->fr.data, 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 = 160;
+       *whennext = s->fr.samples = GSM_SAMPLES;
        return &s->fr;
 }
 
 static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
 {
        int res;
-       unsigned char gsm[66];
+       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;
@@ -162,18 +96,18 @@ static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
                int len=0;
                while(len < f->datalen) {
                        conv65(f->data + len, gsm);
-                       if ((res = write(fs->fd, gsm, 66)) != 66) {
+                       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 % 33) {
+               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 = write(fs->fd, f->data, f->datalen)) != f->datalen) {
+               if ((res = fwrite(f->data, 1, f->datalen, fs->f)) != f->datalen) {
                                ast_log(LOG_WARNING, "Bad write (%d/33): %s\n", res, strerror(errno));
                                return -1;
                }
@@ -181,92 +115,67 @@ static int gsm_write(struct ast_filestream *fs, struct ast_frame *f)
        return 0;
 }
 
-static int gsm_seek(struct ast_filestream *fs, long sample_offset, int whence)
+static int gsm_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
 {
        off_t offset=0,min,cur,max,distance;
        
        min = 0;
-       cur = lseek(fs->fd, 0, SEEK_CUR);
-       max = lseek(fs->fd, 0, SEEK_END);
+       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/160) * 33;
+       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.
+       /* 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;
-               lseek(fs->fd, 0, SEEK_END);
-               for (i=0; i< (offset - max) / 33; i++) {
-                       write(fs->fd, gsm_silence, 33);
+               fseeko(fs->f, 0, SEEK_END);
+               for (i=0; i< (offset - max) / GSM_FRAME_SIZE; i++) {
+                       fwrite(gsm_silence, 1, GSM_FRAME_SIZE, fs->f);
                }
        }
-       return lseek(fs->fd, offset, SEEK_SET);
+       return fseeko(fs->f, offset, SEEK_SET);
 }
 
 static int gsm_trunc(struct ast_filestream *fs)
 {
-       return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
+       return ftruncate(fileno(fs->f), ftello(fs->f));
 }
 
-static long gsm_tell(struct ast_filestream *fs)
+static off_t gsm_tell(struct ast_filestream *fs)
 {
-       off_t offset;
-       offset = lseek(fs->fd, 0, SEEK_CUR);
-       return (offset/33)*160;
+       off_t offset = ftello(fs->f);
+       return (offset/GSM_FRAME_SIZE)*GSM_SAMPLES;
 }
 
-static char *gsm_getcomment(struct ast_filestream *s)
-{
-       return NULL;
-}
+static const struct ast_format gsm_f = {
+       .name = "gsm",
+       .exts = "gsm",
+       .format = AST_FORMAT_GSM,
+       .write = gsm_write,
+       .seek = gsm_seek,
+       .trunc = gsm_trunc,
+       .tell = gsm_tell,
+       .read = gsm_read,
+       .buf_size = 2*GSM_FRAME_SIZE + AST_FRIENDLY_OFFSET,     /* 2 gsm frames */
+};
 
-int load_module()
+static int load_module(void)
 {
-       return ast_format_register(name, exts, AST_FORMAT_GSM,
-                                                               gsm_open,
-                                                               gsm_rewrite,
-                                                               gsm_write,
-                                                               gsm_seek,
-                                                               gsm_trunc,
-                                                               gsm_tell,
-                                                               gsm_read,
-                                                               gsm_close,
-                                                               gsm_getcomment);
-                                                               
-                                                               
+       return ast_format_register(&gsm_f);
 }
 
-int unload_module()
+static int unload_module(void)
 {
-       return ast_format_unregister(name);
+       return ast_format_unregister(gsm_f.name);
 }      
 
-int usecount()
-{
-       int res;
-       if (ast_mutex_lock(&gsm_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock gsm list\n");
-               return -1;
-       }
-       res = glistcnt;
-       ast_mutex_unlock(&gsm_lock);
-       return res;
-}
-
-char *description()
-{
-       return desc;
-}
-
-
-char *key()
-{
-       return ASTERISK_GPL_KEY;
-}
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw GSM data");