cog/Audio/Chain/InputNode.m

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//
// InputNode.m
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// Cog
//
// Created by Vincent Spader on 8/2/05.
// Copyright 2005 Vincent Spader. All rights reserved.
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//
#import "InputNode.h"
#import "BufferChain.h"
#import "Plugin.h"
#import "CoreAudioUtils.h"
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@implementation InputNode
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- (BOOL)openWithSource:(id<CogSource>)source
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{
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decoder = [AudioDecoder audioDecoderForSource:source];
[decoder retain];
if (decoder == nil)
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return NO;
[self registerObservers];
if (![decoder open:source])
{
NSLog(@"Couldn't open decoder...");
return NO;
}
NSDictionary *properties = [decoder properties];
int bitsPerSample = [[properties objectForKey:@"bitsPerSample"] intValue];
int channels = [[properties objectForKey:@"channels"] intValue];
bytesPerFrame = (bitsPerSample/8) * channels;
shouldContinue = YES;
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shouldSeek = NO;
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return YES;
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}
- (BOOL)openWithDecoder:(id<CogDecoder>) d
{
NSLog(@"Opening with old decoder: %@", d);
decoder = d;
[decoder retain];
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NSDictionary *properties = [decoder properties];
int bitsPerSample = [[properties objectForKey:@"bitsPerSample"] intValue];
int channels = [[properties objectForKey:@"channels"] intValue];
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bytesPerFrame = (bitsPerSample/8) * channels;
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[self registerObservers];
shouldContinue = YES;
shouldSeek = NO;
NSLog(@"DONES: %@", decoder);
return YES;
}
- (void)registerObservers
{
NSLog(@"REGISTERING OBSERVERS");
[decoder addObserver:self
forKeyPath:@"properties"
options:(NSKeyValueObservingOptionNew)
context:NULL];
[decoder addObserver:self
forKeyPath:@"metadata"
options:(NSKeyValueObservingOptionNew)
context:NULL];
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context
{
NSLog(@"SOMETHING CHANGED!");
if ([keyPath isEqual:@"properties"]) {
//Setup converter!
//Inform something of properties change
//Disable support until it is properly implimented.
//[controller inputFormatDidChange: propertiesToASBD([decoder properties])];
}
else if ([keyPath isEqual:@"metadata"]) {
//Inform something of metadata change
}
}
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- (void)process
{
int amountInBuffer = 0;
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void *inputBuffer = malloc(CHUNK_SIZE);
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BOOL shouldClose = YES;
while ([self shouldContinue] == YES && [self endOfStream] == NO)
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{
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if (shouldSeek == YES)
{
NSLog(@"SEEKING!");
[decoder seek:seekFrame];
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shouldSeek = NO;
NSLog(@"Seeked! Resetting Buffer");
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[self resetBuffer];
NSLog(@"Reset buffer!");
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initialBufferFilled = NO;
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}
if (amountInBuffer < CHUNK_SIZE) {
int framesToRead = (CHUNK_SIZE - amountInBuffer)/bytesPerFrame;
int framesRead = [decoder readAudio:((char *)inputBuffer) + amountInBuffer frames:framesToRead];
amountInBuffer += (framesRead * bytesPerFrame);
if (framesRead <= 0)
{
if (initialBufferFilled == NO) {
[controller initialBufferFilled:self];
}
NSLog(@"End of stream? %@", [self properties]);
endOfStream = YES;
shouldClose = [controller endOfInputReached]; //Lets us know if we should keep going or not (occassionally, for track changes within a file)
NSLog(@"closing? is %i", shouldClose);
break;
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}
[self writeData:inputBuffer amount:amountInBuffer];
amountInBuffer = 0;
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}
}
if (shouldClose)
[decoder close];
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free(inputBuffer);
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}
- (void)seek:(long)frame
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{
seekFrame = frame;
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shouldSeek = YES;
NSLog(@"Should seek!");
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[semaphore signal];
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}
- (BOOL)setTrack:(NSURL *)track
{
if ([decoder respondsToSelector:@selector(setTrack:)] && [decoder setTrack:track]) {
NSLog(@"SET TRACK!");
return YES;
}
return NO;
}
- (void)dealloc
{
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NSLog(@"Input Node dealloc");
[decoder removeObserver:self forKeyPath:@"properties"];
[decoder removeObserver:self forKeyPath:@"metadata"];
[decoder release];
[super dealloc];
}
- (NSDictionary *) properties
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{
return [decoder properties];
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}
- (id<CogDecoder>) decoder
{
return decoder;
}
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@end