remove unused variable
[asterisk/asterisk.git] / formats / format_pcm_alaw.c
old mode 100755 (executable)
new mode 100644 (file)
index d828aed..ffbb17a
@@ -1,22 +1,29 @@
 /*
- * Asterisk -- A telephony toolkit for Linux.
+ * Asterisk -- An open source telephony toolkit.
  *
- * Flat, binary, alaw PCM file format.
- * 
- * Copyright (C) 1999, Mark Spencer
+ * Copyright (C) 1999 - 2006, 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 Flat, binary, alaw PCM file format.
+ * \arg File name extensions: alaw, al
+ * \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 <unistd.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <stdlib.h>
 #include <sys/times.h>
 #include <sys/types.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.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#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 "asterisk/alaw.h"
 
 #define BUF_SIZE 160           /* 160 samples */
 
-// #define REALTIME_WRITE
+/* #define REALTIME_WRITE */
 
 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 */
+       FILE *f; /* Descriptor */
        struct ast_frame fr;                            /* Frame information */
        char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
        char empty;                                                     /* Empty character */
@@ -60,6 +74,8 @@ static char *name = "alaw";
 static char *desc = "Raw aLaw 8khz PCM Audio support";
 static char *exts = "alaw|al";
 
+static char alaw_silence[BUF_SIZE];
+
 
 #if 0
 /* Returns time in msec since system boot. */
@@ -78,7 +94,7 @@ static unsigned long get_time(void)
 }
 #endif
 
-static struct ast_filestream *pcm_open(int fd)
+static struct ast_filestream *pcm_open(FILE *f)
 {
        /* 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
@@ -91,7 +107,7 @@ static struct ast_filestream *pcm_open(int fd)
                        free(tmp);
                        return NULL;
                }
-               tmp->fd = fd;
+               tmp->f = f;
                tmp->fr.data = tmp->buf;
                tmp->fr.frametype = AST_FRAME_VOICE;
                tmp->fr.subclass = AST_FORMAT_ALAW;
@@ -108,7 +124,7 @@ static struct ast_filestream *pcm_open(int fd)
        return tmp;
 }
 
-static struct ast_filestream *pcm_rewrite(int fd, const char *comment)
+static struct ast_filestream *pcm_rewrite(FILE *f, 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
@@ -121,7 +137,7 @@ static struct ast_filestream *pcm_rewrite(int fd, const char *comment)
                        free(tmp);
                        return NULL;
                }
-               tmp->fd = fd;
+               tmp->f = f;
 #ifdef REALTIME_WRITE
                tmp->start_time = get_time();
 #endif
@@ -142,7 +158,7 @@ static void pcm_close(struct ast_filestream *s)
        glistcnt--;
        ast_mutex_unlock(&pcm_lock);
        ast_update_use_count();
-       close(s->fd);
+       fclose(s->f);
        free(s);
        s = NULL;
 }
@@ -157,7 +173,7 @@ static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
        s->fr.offset = AST_FRIENDLY_OFFSET;
        s->fr.mallocd = 0;
        s->fr.data = s->buf;
-       if ((res = read(s->fd, s->buf, BUF_SIZE)) < 1) {
+       if ((res = fread(s->buf, 1, BUF_SIZE, s->f)) < 1) {
                if (res)
                        ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
                return NULL;
@@ -188,49 +204,45 @@ static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
 
 #ifdef REALTIME_WRITE
        cur_time = get_time();
-       fpos = ( cur_time - fs->start_time ) * 8;       // 8 bytes per msec
-       // Check if we have written to this position yet. If we have, then increment pos by one frame
-       // for some degree of protection against receiving packets in the same clock tick.
-       fstat( fs->fd, &stat_buf );
-       if( stat_buf.st_size > fpos )
-       {
-               fpos += f->datalen;     // Incrementing with the size of this current frame
+       fpos = ( cur_time - fs->start_time ) * 8;       /* 8 bytes per msec */
+       /* Check if we have written to this position yet. If we have, then increment pos by one frame
+       *  for some degree of protection against receiving packets in the same clock tick.
+       */
+       
+       fstat(fileno(fs->f), &stat_buf );
+       if (stat_buf.st_size > fpos ) {
+               fpos += f->datalen;     /* Incrementing with the size of this current frame */
        }
 
-       if( stat_buf.st_size < fpos )
-       {
-               // fill the gap with 0x55 rather than 0.
+       if (stat_buf.st_size < fpos) {
+               /* fill the gap with 0x55 rather than 0. */
                char buf[ 512 ];
                unsigned long cur, to_write;
 
                cur = stat_buf.st_size;
-               if( lseek( fs->fd, cur, SEEK_SET ) < 0 )
-               {
+               if (fseek(fs->f, cur, SEEK_SET) < 0) {
                        ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
                        return -1;
                }
-               memset( buf, 0x55, 512 );
-               while( cur < fpos )
-               {
+               memset(buf, 0x55, 512);
+               while (cur < fpos) {
                        to_write = fpos - cur;
-                       if( to_write > 512 )
-                       {
+                       if (to_write > 512) {
                                to_write = 512;
                        }
-                       write( fs->fd, buf, to_write );
+                       fwrite(buf, 1, to_write, fs->f);
                        cur += to_write;
                }
        }
 
 
-       if( lseek( fs->fd, fpos, SEEK_SET ) < 0 )
-       {
+       if (fseek(s->f, fpos, SEEK_SET) < 0) {
                ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) );
                return -1;
        }
-#endif // REALTIME_WRITE
+#endif /* REALTIME_WRITE */
        
-       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/%d): %s\n", res, f->datalen, strerror(errno));
                        return -1;
        }
@@ -239,34 +251,63 @@ static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
 
 static int pcm_seek(struct ast_filestream *fs, long sample_offset, int whence)
 {
-       off_t offset=0,min,cur,max;
+       long cur, max, offset = 0;
+       int ret = -1; /* assume error */
 
-       min = 0;
-       cur = lseek(fs->fd, 0, SEEK_CUR);
-       max = lseek(fs->fd, 0, SEEK_END);
-       if (whence == SEEK_SET)
+       cur = ftell(fs->f);
+       fseek(fs->f, 0, SEEK_END);
+       max = ftell(fs->f);
+
+       switch (whence) {
+       case SEEK_SET:
                offset = sample_offset;
-       else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
-               offset = sample_offset + cur;
-       else if (whence == SEEK_END)
+               break;
+       case SEEK_END:
                offset = max - sample_offset;
-       if (whence != SEEK_FORCECUR) {
-               offset = (offset > max)?max:offset;
+               break;
+       case SEEK_CUR:
+       case SEEK_FORCECUR:
+               offset = cur + sample_offset;
+               break;
+       default:
+               ast_log(LOG_WARNING, "invalid whence %d, assuming SEEK_SET\n", whence);
+               offset = sample_offset;
+       }
+
+       if (offset < 0) {
+               offset = 0;
+               ast_log(LOG_WARNING, "negative offset %ld, resetting to 0\n", offset);
        }
-       // Always protect against seeking past begining
-       offset = (offset < min)?min:offset;
-       return lseek(fs->fd, offset, SEEK_SET);
+       if (whence == SEEK_FORCECUR && offset > max) {
+               size_t left = offset - max;
+
+               while (left) {
+                       size_t written = fwrite(alaw_silence, sizeof(alaw_silence[0]),
+                                    (left > BUF_SIZE) ? BUF_SIZE : left, fs->f);
+                       if (written == -1)
+                               break; /* error */
+                       left -= written * sizeof(alaw_silence[0]);
+               }
+               ret = 0; /* success */
+       } else {
+                if (offset > max) {
+                        ast_log(LOG_WARNING, "offset too large %ld, truncating to %ld\n", offset, max);
+                        offset = max;
+               }
+                ret = fseek(fs->f, offset, SEEK_SET);
+       }
+       return ret;
 }
 
 static int pcm_trunc(struct ast_filestream *fs)
 {
-       return ftruncate(fs->fd, lseek(fs->fd,0,SEEK_CUR));
+       return ftruncate(fileno(fs->f), ftell(fs->f));
 }
 
 static long pcm_tell(struct ast_filestream *fs)
 {
        off_t offset;
-       offset = lseek(fs->fd, 0, SEEK_CUR);
+       offset = ftell(fs->f);
        return offset;
 }
 
@@ -278,16 +319,21 @@ static char *pcm_getcomment(struct ast_filestream *s)
 
 int load_module()
 {
+       int index;
+
+       for (index = 0; index < (sizeof(alaw_silence) / sizeof(alaw_silence[0])); index++)
+               alaw_silence[index] = AST_LIN2A(0);
+
        return ast_format_register(name, exts, AST_FORMAT_ALAW,
-                                                               pcm_open,
-                                                               pcm_rewrite,
-                                                               pcm_write,
-                                                               pcm_seek,
-                                                               pcm_trunc,
-                                                               pcm_tell,
-                                                               pcm_read,
-                                                               pcm_close,
-                                                               pcm_getcomment);
+                                  pcm_open,
+                                  pcm_rewrite,
+                                  pcm_write,
+                                  pcm_seek,
+                                  pcm_trunc,
+                                  pcm_tell,
+                                  pcm_read,
+                                  pcm_close,
+                                  pcm_getcomment);
 }
 
 int unload_module()
@@ -297,14 +343,7 @@ int unload_module()
 
 int usecount()
 {
-       int res;
-       if (ast_mutex_lock(&pcm_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock pcm list\n");
-               return -1;
-       }
-       res = glistcnt;
-       ast_mutex_unlock(&pcm_lock);
-       return res;
+       return glistcnt;
 }
 
 char *description()