477feaab1d
Sample format can now change dynamically at play time, and the player will resample it as necessary, extrapolating edges between changes to reduce the potential for gaps. Currently supported formats for this: - FLAC - Ogg Vorbis - Any format supported by FFmpeg, such as MP3 or AAC Signed-off-by: Christopher Snowhill <kode54@gmail.com>
113 lines
2.1 KiB
Objective-C
113 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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