144 lines
3.0 KiB
Objective-C
144 lines
3.0 KiB
Objective-C
//
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// InputNode.m
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// Cog
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//
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// Created by Vincent Spader on 8/2/05.
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// Copyright 2005 Vincent Spader. All rights reserved.
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//
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#import "InputNode.h"
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#import "BufferChain.h"
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#import "Plugin.h"
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#import "CoreAudioUtils.h"
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@implementation InputNode
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- (BOOL)openURL:(NSURL *)url withSource:(id<CogSource>)source outputFormat:(AudioStreamBasicDescription)of
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{
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outputFormat = of;
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decoder = [AudioDecoder audioDecoderForURL:url];
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[decoder retain];
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converter = [[Converter alloc] init];
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if (converter == nil)
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return NO;
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[self registerObservers];
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if (decoder == nil)
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return NO;
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if (![decoder open:source])
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{
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NSLog(@"Couldn't open decoder...");
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return NO;
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}
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shouldContinue = YES;
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shouldSeek = NO;
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return YES;
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}
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- (void)registerObservers
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{
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[decoder addObserver:self
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forKeyPath:@"properties"
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options:(NSKeyValueObservingOptionNew)
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context:NULL];
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[decoder addObserver:self
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forKeyPath:@"metadata"
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options:(NSKeyValueObservingOptionNew)
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context:NULL];
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}
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- (void)observeValueForKeyPath:(NSString *)keyPath
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ofObject:(id)object
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change:(NSDictionary *)change
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context:(void *)context
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{
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if ([keyPath isEqual:@"properties"]) {
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//Setup converter!
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[converter cleanUp];
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[converter setupWithInputFormat:propertiesToASBD([decoder properties]) outputFormat:outputFormat];
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//Inform something of properties change
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}
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else if ([keyPath isEqual:@"metadata"]) {
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//Inform something of metadata change
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}
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}
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- (void)process
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{
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int amountRead = 0, amountConverted = 0, amountInBuffer = 0;
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void *inputBuffer = malloc(CHUNK_SIZE);
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while ([self shouldContinue] == YES && [self endOfStream] == NO)
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{
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if (shouldSeek == YES)
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{
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[decoder seekToTime:seekTime];
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shouldSeek = NO;
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[self resetBuffer];
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initialBufferFilled = NO;
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}
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if (amountInBuffer < CHUNK_SIZE) {
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amountRead = [decoder fillBuffer:((char *)inputBuffer) + amountInBuffer ofSize:CHUNK_SIZE - amountInBuffer];
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amountInBuffer += amountRead;
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}
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amountConverted = [converter convert:inputBuffer amount:amountInBuffer]; //Convert fills in converter buffer, til the next call
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if (amountInBuffer - amountConverted > 0) {
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memmove(inputBuffer,((char *)inputBuffer) + amountConverted, amountInBuffer - amountConverted);
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}
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amountInBuffer -= amountConverted;
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if ([converter outputBufferSize] <= 0)
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{
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if (initialBufferFilled == NO) {
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[controller initialBufferFilled];
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}
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endOfStream = YES;
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[controller endOfInputReached];
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break; //eof
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}
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[self writeData:[converter outputBuffer] amount:[converter outputBufferSize]];
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}
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[decoder close];
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[converter cleanUp];
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free(inputBuffer);
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}
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- (void)seek:(double)time
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{
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seekTime = time;
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shouldSeek = YES;
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[self resetBuffer];
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[semaphore signal];
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}
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- (void)dealloc
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{
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[decoder removeObserver:self forKeyPath:@"properties"];
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[decoder removeObserver:self forKeyPath:@"metadata"];
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[decoder release];
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[super dealloc];
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}
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- (NSDictionary *) properties
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{
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return [decoder properties];
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}
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@end
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