don't take locks when reading usecounts, they are not necessary (bug #4585)
[asterisk/asterisk.git] / formats / format_pcm_alaw.c
index 9a4f665..827c142 100755 (executable)
@@ -3,39 +3,40 @@
  *
  * Flat, binary, alaw PCM file format.
  * 
- * Copyright (C) 1999, Mark Spencer
+ * Copyright (C) 1999, Digium, inc
  *
- * Mark Spencer <markster@linux-support.net>
+ * Mark Spencer <markster@digium.com>
  *
  * This program is free software, distributed under the terms of
  * the GNU General Public License
  */
  
-#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/time.h>
 #include <sys/times.h>
 #include <sys/types.h>
 #include <stdio.h>
-#include <unistd.h>
 #include <errno.h>
 #include <string.h>
-#include <pthread.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"
 
 #define BUF_SIZE 160           /* 160 samples */
 
-// #define REALTIME_WRITE
+/* #define REALTIME_WRITE */
 
 struct ast_filestream {
        void *reserved[AST_RESERVED_POINTERS];
@@ -43,23 +44,17 @@ struct ast_filestream {
           weird MS format */
        /* This is what a filestream means to us */
        int fd; /* Descriptor */
-       struct ast_channel *owner;
        struct ast_frame fr;                            /* Frame information */
        char waste[AST_FRIENDLY_OFFSET];        /* Buffer for sending frames, etc */
        char empty;                                                     /* Empty character */
        unsigned char buf[BUF_SIZE];                            /* Output Buffer */
-       int lasttimeout;
-       struct timeval last;
 #ifdef REALTIME_WRITE
        unsigned long start_time;
 #endif
-       int adj;
-       struct ast_filestream *next;
 };
 
 
-static struct ast_filestream *glist = NULL;
-static pthread_mutex_t pcm_lock = AST_MUTEX_INITIALIZER;
+AST_MUTEX_DEFINE_STATIC(pcm_lock);
 static int glistcnt = 0;
 
 static char *name = "alaw";
@@ -67,6 +62,7 @@ static char *desc = "Raw aLaw 8khz PCM Audio support";
 static char *exts = "alaw|al";
 
 
+#if 0
 /* Returns time in msec since system boot. */
 static unsigned long get_time(void)
 {
@@ -81,6 +77,7 @@ static unsigned long get_time(void)
        }
        return cur * 1000 / sysconf( _SC_CLK_TCK );
 }
+#endif
 
 static struct ast_filestream *pcm_open(int fd)
 {
@@ -90,33 +87,29 @@ static struct ast_filestream *pcm_open(int fd)
        struct ast_filestream *tmp;
        if ((tmp = malloc(sizeof(struct ast_filestream)))) {
                memset(tmp, 0, sizeof(struct ast_filestream));
-               if (pthread_mutex_lock(&pcm_lock)) {
+               if (ast_mutex_lock(&pcm_lock)) {
                        ast_log(LOG_WARNING, "Unable to lock pcm list\n");
                        free(tmp);
                        return NULL;
                }
-               tmp->next = glist;
-               glist = tmp;
                tmp->fd = fd;
-               tmp->owner = NULL;
                tmp->fr.data = tmp->buf;
                tmp->fr.frametype = AST_FRAME_VOICE;
                tmp->fr.subclass = AST_FORMAT_ALAW;
                /* datalen will vary for each frame */
                tmp->fr.src = name;
                tmp->fr.mallocd = 0;
-               tmp->lasttimeout = -1;
 #ifdef REALTIME_WRITE
                tmp->start_time = get_time();
 #endif
                glistcnt++;
-               pthread_mutex_unlock(&pcm_lock);
+               ast_mutex_unlock(&pcm_lock);
                ast_update_use_count();
        }
        return tmp;
 }
 
-static struct ast_filestream *pcm_rewrite(int fd, char *comment)
+static struct ast_filestream *pcm_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
@@ -124,74 +117,40 @@ static struct ast_filestream *pcm_rewrite(int fd, char *comment)
        struct ast_filestream *tmp;
        if ((tmp = malloc(sizeof(struct ast_filestream)))) {
                memset(tmp, 0, sizeof(struct ast_filestream));
-               if (pthread_mutex_lock(&pcm_lock)) {
+               if (ast_mutex_lock(&pcm_lock)) {
                        ast_log(LOG_WARNING, "Unable to lock pcm list\n");
                        free(tmp);
                        return NULL;
                }
-               tmp->next = glist;
-               glist = tmp;
                tmp->fd = fd;
-               tmp->owner = NULL;
-               tmp->lasttimeout = -1;
 #ifdef REALTIME_WRITE
                tmp->start_time = get_time();
 #endif
                glistcnt++;
-               pthread_mutex_unlock(&pcm_lock);
+               ast_mutex_unlock(&pcm_lock);
                ast_update_use_count();
        } else
                ast_log(LOG_WARNING, "Out of memory\n");
        return tmp;
 }
 
-static struct ast_frame *pcm_read(struct ast_filestream *s)
-{
-       return NULL;
-}
-
 static void pcm_close(struct ast_filestream *s)
 {
-       struct ast_filestream *tmp, *tmpl = NULL;
-       if (pthread_mutex_lock(&pcm_lock)) {
+       if (ast_mutex_lock(&pcm_lock)) {
                ast_log(LOG_WARNING, "Unable to lock pcm list\n");
                return;
        }
-       tmp = glist;
-       while(tmp) {
-               if (tmp == s) {
-                       if (tmpl)
-                               tmpl->next = tmp->next;
-                       else
-                               glist = tmp->next;
-                       break;
-               }
-               tmpl = tmp;
-               tmp = tmp->next;
-       }
        glistcnt--;
-       if (s->owner) {
-               s->owner->stream = NULL;
-               if (s->owner->streamid > -1)
-                       ast_sched_del(s->owner->sched, s->owner->streamid);
-               s->owner->streamid = -1;
-       }
-       pthread_mutex_unlock(&pcm_lock);
+       ast_mutex_unlock(&pcm_lock);
        ast_update_use_count();
-       if (!tmp) 
-               ast_log(LOG_WARNING, "Freeing a filestream we don't seem to own\n");
        close(s->fd);
        free(s);
        s = NULL;
 }
 
-static int ast_read_callback(void *data)
+static struct ast_frame *pcm_read(struct ast_filestream *s, int *whennext)
 {
-       int retval = 0;
        int res;
-       int delay;
-       struct ast_filestream *s = data;
-       struct timeval tv;
        /* Send a frame from the file to the appropriate channel */
 
        s->fr.frametype = AST_FRAME_VOICE;
@@ -202,60 +161,12 @@ static int ast_read_callback(void *data)
        if ((res = read(s->fd, s->buf, BUF_SIZE)) < 1) {
                if (res)
                        ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
-               s->owner->streamid = -1;
-               return 0;
+               return NULL;
        }
        s->fr.samples = res;
        s->fr.datalen = res;
-       delay = s->fr.samples/8;
-       /* Lastly, process the frame */
-       if (ast_write(s->owner, &s->fr)) {
-               ast_log(LOG_WARNING, "Failed to write frame\n");
-               s->owner->streamid = -1;
-               return 0;
-       }
-       if (s->last.tv_usec || s->last.tv_usec) {
-               int ms;
-               gettimeofday(&tv, NULL);
-               ms = 1000 * (tv.tv_sec - s->last.tv_sec) + 
-                       (tv.tv_usec - s->last.tv_usec) / 1000;
-               s->last.tv_sec = tv.tv_sec;
-               s->last.tv_usec = tv.tv_usec;
-               if ((ms - delay) * (ms - delay) > 4) {
-                       /* Compensate if we're more than 2 ms off */
-                       s->adj -= (ms - delay);
-               }
-#if 0
-               fprintf(stdout, "Delay is %d, adjustment is %d, last was %d\n", delay, s->adj, ms);
-#endif
-               delay += s->adj;
-               if (delay < 1)
-                       delay = 1;
-       } else
-               gettimeofday(&s->last, NULL);
-       if (s->lasttimeout != delay) {
-               /* We'll install the next timeout now. */
-               s->owner->streamid = ast_sched_add(s->owner->sched,
-                               delay, ast_read_callback, s); 
-               s->lasttimeout = delay;
-       } else {
-               /* Just come back again at the same time */
-               retval = -1;
-       }
-       return retval;
-}
-
-static int pcm_apply(struct ast_channel *c, struct ast_filestream *s)
-{
-       /* Select our owner for this stream, and get the ball rolling. */
-       s->owner = c;
-       return 0;
-}
-
-static int pcm_play(struct ast_filestream *s)
-{
-       ast_read_callback(s);
-       return 0;
+       *whennext = s->fr.samples;
+       return &s->fr;
 }
 
 static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
@@ -278,18 +189,19 @@ 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.
+       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 += f->datalen;     /* Incrementing with the size of this current frame */
        }
 
        if( stat_buf.st_size < fpos )
        {
-               // fill the gap with 0x55 rather than 0.
+               /* fill the gap with 0x55 rather than 0. */
                char buf[ 512 ];
                unsigned long cur, to_write;
 
@@ -318,7 +230,7 @@ static int pcm_write(struct ast_filestream *fs, struct ast_frame *f)
                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) {
                        ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
@@ -329,18 +241,21 @@ 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,min,cur,max;
+       off_t offset=0,min,cur,max;
 
        min = 0;
        cur = lseek(fs->fd, 0, SEEK_CUR);
        max = lseek(fs->fd, 0, SEEK_END);
-       if(whence == SEEK_SET)
+       if (whence == SEEK_SET)
                offset = sample_offset;
-       if(whence == SEEK_CUR)
+       else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
                offset = sample_offset + cur;
-       if(whence == SEEK_END)
+       else if (whence == SEEK_END)
                offset = max - sample_offset;
-       offset = (offset > max)?max:offset;
+       if (whence != SEEK_FORCECUR) {
+               offset = (offset > max)?max:offset;
+       }
+       /* Always protect against seeking past begining */
        offset = (offset < min)?min:offset;
        return lseek(fs->fd, offset, SEEK_SET);
 }
@@ -368,8 +283,6 @@ int load_module()
        return ast_format_register(name, exts, AST_FORMAT_ALAW,
                                                                pcm_open,
                                                                pcm_rewrite,
-                                                               pcm_apply,
-                                                               pcm_play,
                                                                pcm_write,
                                                                pcm_seek,
                                                                pcm_trunc,
@@ -381,33 +294,12 @@ int load_module()
 
 int unload_module()
 {
-       struct ast_filestream *tmp, *tmpl;
-       if (pthread_mutex_lock(&pcm_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock pcm list\n");
-               return -1;
-       }
-       tmp = glist;
-       while(tmp) {
-               if (tmp->owner)
-                       ast_softhangup(tmp->owner, AST_SOFTHANGUP_APPUNLOAD);
-               tmpl = tmp;
-               tmp = tmp->next;
-               free(tmpl);
-       }
-       pthread_mutex_unlock(&pcm_lock);
        return ast_format_unregister(name);
 }      
 
 int usecount()
 {
-       int res;
-       if (pthread_mutex_lock(&pcm_lock)) {
-               ast_log(LOG_WARNING, "Unable to lock pcm list\n");
-               return -1;
-       }
-       res = glistcnt;
-       pthread_mutex_unlock(&pcm_lock);
-       return res;
+       return glistcnt;
 }
 
 char *description()