113 lines
2.2 KiB
Plaintext
113 lines
2.2 KiB
Plaintext
//
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// ShnFile.mm
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// Cog
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//
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// Created by Vincent Spader on 6/6/05.
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// Copyright 2005 Vincent Spader All rights reserved.
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//
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#import "ShortenDecoder.h"
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@implementation ShortenDecoder
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- (BOOL)open:(id<CogSource>)source {
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NSURL *url = [source url];
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if(![[url scheme] isEqualToString:@"file"])
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return NO;
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decoder = new shn_reader;
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if(!decoder) {
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return NO;
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}
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decoder->open([[url path] UTF8String], true);
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bufferSize = decoder->shn_get_buffer_block_size(NUM_DEFAULT_BUFFER_BLOCKS);
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bool seekTable;
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decoder->file_info(NULL, &channels, &frequency, NULL, &bitsPerSample, &seekTable);
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seekable = seekTable == true ? YES : NO;
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totalFrames = (decoder->shn_get_song_length() * frequency) / 1000.0;
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decoder->go();
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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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- (int)readAudio:(void *)buf frames:(UInt32)frames {
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long bytesPerFrame = channels * (bitsPerSample / 8);
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long amountRead;
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// For some reason a busy loop is causing pops when output is set to 48000. Probably CPU starvation, since the SHN decoder seems to use a multithreaded nonblocking approach.
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do {
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amountRead = decoder->read(buf, frames * bytesPerFrame);
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} while(amountRead == -1);
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return (int)(amountRead / bytesPerFrame);
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}
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- (long)seek:(long)sample {
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unsigned int sec = sample / frequency;
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decoder->seek(sec);
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return sample;
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}
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- (void)close {
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if(decoder) {
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decoder->exit();
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delete decoder;
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decoder = NULL;
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}
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/*if (shn_cleanup_decoder(handle))
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shn_unload(handle);*/
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}
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- (void)dealloc {
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[self close];
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}
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- (NSDictionary *)properties {
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return @{ @"channels": @(channels),
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@"bitsPerSample": @(bitsPerSample),
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@"sampleRate": @(frequency),
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@"totalFrames": @(totalFrames),
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@"seekable": @(seekable),
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@"codec": @"Shorten",
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@"endian": @"little",
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@"encoding": @"lossless" };
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}
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- (NSDictionary *)metadata {
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return @{};
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}
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+ (NSArray *)fileTypes {
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return @[@"shn"];
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}
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+ (NSArray *)mimeTypes {
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return @[@"application/x-shorten"]; // This is basically useless, since we cant stream shorten yet
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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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@[@"Shorten File", @"shn.icns", @"shn"]
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];
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}
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@end
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