117 lines
1.9 KiB
Objective-C
117 lines
1.9 KiB
Objective-C
//
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// SilenceDecoder.m
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// Cog
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//
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// Created by Christopher Snowhill on 2/8/15.
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// Copyright 2015 __NoWork, LLC__. All rights reserved.
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//
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#import "SilenceDecoder.h"
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#import "Logging.h"
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#import "PlaylistController.h"
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@implementation SilenceDecoder
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enum { sample_rate = 44100 };
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enum { channels = 2 };
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- (BOOL)open:(id<CogSource>)s {
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[self setSource:s];
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NSString *path = [[[s url] relativeString] substringFromIndex:10];
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int seconds = [path intValue];
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if(!seconds) seconds = 10;
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length = seconds * sample_rate;
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remain = length;
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buffer = (float *) calloc(sizeof(float), 1024 * channels);
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if(!buffer) {
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ALog(@"Out of memory!");
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return NO;
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}
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[self willChangeValueForKey:@"properties"];
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[self didChangeValueForKey:@"properties"];
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return YES;
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}
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- (NSDictionary *)properties {
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return @{ @"bitrate": @(0),
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@"sampleRate": @(sample_rate),
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@"totalFrames": @(length),
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@"bitsPerSample": @(32),
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@"floatingPoint": @(YES),
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@"channels": @(channels),
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@"seekable": @(YES),
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@"endian": @"host",
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@"encoding": @"synthesized" };
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}
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- (NSDictionary *)metadata {
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return @{};
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}
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- (AudioChunk *)readAudio {
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int frames = 1024;
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if(!IsRepeatOneSet()) {
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if(frames > remain)
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frames = (int)remain;
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remain -= frames;
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}
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id audioChunkClass = NSClassFromString(@"AudioChunk");
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AudioChunk *chunk = [[audioChunkClass alloc] initWithProperties:[self properties]];
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[chunk assignSamples:buffer frameCount:frames];
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return chunk;
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}
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- (long)seek:(long)frame {
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if(frame > length)
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frame = length;
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remain = length - frame;
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return frame;
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}
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- (void)close {
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}
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- (void)setSource:(id<CogSource>)s {
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source = s;
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}
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- (id<CogSource>)source {
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return source;
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}
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- (BOOL)isSilence {
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return YES;
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}
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+ (NSArray *)fileTypes {
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return @[];
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}
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+ (NSArray *)mimeTypes {
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return @[@"audio/x-silence"];
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}
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+ (float)priority {
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return 1.0;
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}
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+ (NSArray *)fileTypeAssociations {
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return @[];
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}
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@end
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