3c351f6968
readAudio now returns an AudioChunk object directly, and all inputs have been changed to accomodate this. Also, input and converter processing have been altered to better work with this. Signed-off-by: Christopher Snowhill <kode54@gmail.com>
121 lines
2.4 KiB
Text
121 lines
2.4 KiB
Text
//
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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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- (AudioChunk *)readAudio {
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long frames = 1024;
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long bytesPerFrame = channels * (bitsPerSample / 8);
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long amountRead;
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id audioChunkClass = NSClassFromString(@"AudioChunk");
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AudioChunk *chunk = [[audioChunkClass alloc] initWithProperties:[self properties]];
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uint8_t buffer[bytesPerFrame * 1024];
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void *buf = (void *)buffer;
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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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[chunk assignSamples:buf frameCount:amountRead / bytesPerFrame];
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return chunk;
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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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