Player.m

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/*
 * Player.m - an object to play digital sounds.
 * Author: Robert D. Poor, NeXT Technical Support
 * Copyright 1989 NeXT, Inc.  Next, Inc. is furnishing this software
 * for example purposes only and assumes no liability for its use.
 * 06-Dec-89
 */

/*
 * The Player object provides a common superclass for a family of
 * playing objects.  (Currently this is a family of one, the
 * DACPlayer object, but this could be extended to play data out
 * over the DSP port.  The Player object keeps track of the current
 * playing state and translates stop/pause/play messages into
 * lower level messages (playerPrepare, playerStart, etc).
 *
 * This object must be subclassed in order to do anything useful.
 * See the DACPlayer for an example.
 */

#import <stdlib.h>
#import <stdio.h>
#import <appkit/Panel.h>
#import <sound/sounddriver.h>
#import <sound/soundstruct.h>
#import "Player.h"
#import "errors.h"

@implementation Player:Object

/*
 * Create a new Player object.
 */
+ new
{
  self = [super new];

  bytesPlayed = 0;
  playerState = PLA_STOPPED;
  regions = NULL;
  [self setupRegions:4*vm_page_size:3];		/* allocate some regions */

  return self;
}

- free
/*
 * Free the Player object and any associated storage.
 */
{
  [self freeRegions];
  return [super free];
}

- stop
{
  NXRunAlertPanel("Alert",
		  "The method %s must be implemented in a subclass",
		  NULL,NULL,NULL,"stop");
  return self;
}

- prepare
{
  NXRunAlertPanel("Alert",
		  "The method %s must be implemented in a subclass",
		  NULL,NULL,NULL,"prepare");
  return self;
}

- run
{
  NXRunAlertPanel("Alert",
		  "The method %s must be implemented in a subclass",
		  NULL,NULL,NULL,"run");
  return self;
}

- pause
{
  NXRunAlertPanel("Alert",
		  "The method %s must be implemented in a subclass",
		  NULL,NULL,NULL,"pause");
  return self;
}

- (Pla_state_t)state
{
  return playerState;
}

- (int)bytesPlayed
{
  return bytesPlayed;
}

- delegate
/*
 * Returns the current delegate.
 */
{
  return delegate;
}

- setDelegate:anObject
/*
 * Sets the delegate of the recoder
 */
{
  delegate = anObject;
}

- (int)regionSize
{
  return regionSize;
}

- setRegionSize:(int)nbytes
{
  return [self setupRegions:nbytes:regionCount];
}

- (int)regionCount
{
  return regionCount;
}

- setRegionCount:(int)nregions
{
  return [self setupRegions:regionSize:nregions];
}

- freeRegions
/*
 * Release any allocated regions.
 */
{
  int i, r;

  if (regions) {
    for (i=0;i<regionCount;i++) {
      r = vm_deallocate(task_self(), regions[i], regionSize);
    }
    free(regions);
    regions = NULL;
  }
  return self;
}

- setupRegions:(int)size:(int)count
{
  int i,r;

  [self freeRegions];

  /* update regionSize and regionCount and allocate fresh regions */
  regionSize = size;
  regionCount = count;
  regions = malloc(count*sizeof(vm_address_t));
  for (i=0;i<regionCount;i++) {
    r = vm_allocate(task_self(), &regions[i], regionSize, TRUE);
  }
  return self;
}

@end
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