114 lines
2.1 KiB
Objective-C
114 lines
2.1 KiB
Objective-C
//
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// ChunkList.m
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// CogAudio Framework
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//
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// Created by Christopher Snowhill on 2/5/22.
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//
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#import "ChunkList.h"
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@implementation ChunkList
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@synthesize listDuration;
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@synthesize maxDuration;
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- (id)initWithMaximumDuration:(double)duration {
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self = [super init];
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if(self) {
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chunkList = [[NSMutableArray alloc] init];
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listDuration = 0.0;
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maxDuration = duration;
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inAdder = NO;
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inRemover = NO;
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inPeeker = NO;
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stopping = NO;
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}
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return self;
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}
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- (void)dealloc {
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stopping = YES;
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while(inAdder || inRemover || inPeeker) {
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usleep(500);
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}
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}
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- (void)reset {
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@synchronized(chunkList) {
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[chunkList removeAllObjects];
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listDuration = 0.0;
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}
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}
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- (BOOL)isEmpty {
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@synchronized(chunkList) {
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return [chunkList count] == 0;
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}
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}
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- (BOOL)isFull {
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return (maxDuration - listDuration) < 0.01;
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}
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- (void)addChunk:(AudioChunk *)chunk {
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if(stopping) return;
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inAdder = YES;
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const double chunkDuration = [chunk duration];
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@synchronized(chunkList) {
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[chunkList addObject:chunk];
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listDuration += chunkDuration;
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}
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inAdder = NO;
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}
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- (AudioChunk *)removeSamples:(size_t)maxFrameCount {
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if(stopping) {
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return [[AudioChunk alloc] init];
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}
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@synchronized(chunkList) {
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inRemover = YES;
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if(![chunkList count]) {
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inRemover = NO;
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return [[AudioChunk alloc] init];
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}
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AudioChunk *chunk = [chunkList objectAtIndex:0];
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if([chunk frameCount] <= maxFrameCount) {
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[chunkList removeObjectAtIndex:0];
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listDuration -= [chunk duration];
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inRemover = NO;
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return chunk;
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}
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NSData *removedData = [chunk removeSamples:maxFrameCount];
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AudioChunk *ret = [[AudioChunk alloc] init];
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[ret setFormat:[chunk format]];
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[ret setChannelConfig:[chunk channelConfig]];
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[ret assignSamples:[removedData bytes] frameCount:maxFrameCount];
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listDuration -= [ret duration];
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inRemover = NO;
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return ret;
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}
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}
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- (BOOL)peekFormat:(AudioStreamBasicDescription *)format channelConfig:(uint32_t *)config {
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if(stopping) return NO;
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@synchronized(chunkList) {
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if([chunkList count]) {
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AudioChunk *chunk = [chunkList objectAtIndex:0];
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*format = [chunk format];
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*config = [chunk channelConfig];
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return YES;
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}
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}
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return NO;
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}
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@end
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