cog/Audio/Chain/ChunkList.m

114 lines
2.1 KiB
Objective-C

//
// ChunkList.m
// CogAudio Framework
//
// Created by Christopher Snowhill on 2/5/22.
//
#import "ChunkList.h"
@implementation ChunkList
@synthesize listDuration;
@synthesize maxDuration;
- (id)initWithMaximumDuration:(double)duration {
self = [super init];
if(self) {
chunkList = [[NSMutableArray alloc] init];
listDuration = 0.0;
maxDuration = duration;
inAdder = NO;
inRemover = NO;
inPeeker = NO;
stopping = NO;
}
return self;
}
- (void)dealloc {
stopping = YES;
while(inAdder || inRemover || inPeeker) {
usleep(500);
}
}
- (void)reset {
@synchronized(chunkList) {
[chunkList removeAllObjects];
listDuration = 0.0;
}
}
- (BOOL)isEmpty {
@synchronized(chunkList) {
return [chunkList count] == 0;
}
}
- (BOOL)isFull {
return (maxDuration - listDuration) < 0.05;
}
- (void)addChunk:(AudioChunk *)chunk {
if(stopping) return;
inAdder = YES;
const double chunkDuration = [chunk duration];
@synchronized(chunkList) {
[chunkList addObject:chunk];
listDuration += chunkDuration;
}
inAdder = NO;
}
- (AudioChunk *)removeSamples:(size_t)maxFrameCount {
if(stopping) {
return [[AudioChunk alloc] init];
}
@synchronized(chunkList) {
inRemover = YES;
if(![chunkList count]) {
inRemover = NO;
return [[AudioChunk alloc] init];
}
AudioChunk *chunk = [chunkList objectAtIndex:0];
if([chunk frameCount] <= maxFrameCount) {
[chunkList removeObjectAtIndex:0];
listDuration -= [chunk duration];
inRemover = NO;
return chunk;
}
NSData *removedData = [chunk removeSamples:maxFrameCount];
AudioChunk *ret = [[AudioChunk alloc] init];
[ret setFormat:[chunk format]];
[ret setChannelConfig:[chunk channelConfig]];
[ret assignSamples:[removedData bytes] frameCount:maxFrameCount];
listDuration -= [ret duration];
inRemover = NO;
return ret;
}
}
- (BOOL)peekFormat:(AudioStreamBasicDescription *)format channelConfig:(uint32_t *)config {
if(stopping) return NO;
@synchronized(chunkList) {
if([chunkList count]) {
AudioChunk *chunk = [chunkList objectAtIndex:0];
*format = [chunk format];
*config = [chunk channelConfig];
return YES;
}
}
return NO;
}
@end