378 lines
8.9 KiB
Plaintext
Executable File
378 lines
8.9 KiB
Plaintext
Executable File
//
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// SidDecoder.mm
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// sidplay
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//
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// Created by Christopher Snowhill on 12/8/14.
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// Copyright 2014 __NoWork, Inc__. All rights reserved.
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//
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#import "SidDecoder.h"
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#import <sidplayfp/residfp.h>
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#import "roms.hpp"
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#import "Logging.h"
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#import "PlaylistController.h"
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#include <vector>
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static const char * extListEmpty[] = { NULL };
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static const char * extListStr[] = { ".str", NULL };
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@interface sid_file_container : NSObject {
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NSLock * lock;
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NSMutableDictionary * list;
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}
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+ (sid_file_container *)instance;
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- (void)add_hint:(NSString *)path source:(id)source;
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- (void)remove_hint:(NSString *)path;
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- (BOOL)try_hint:(NSString *)path source:(id*)source;
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@end
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@implementation sid_file_container
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+ (sid_file_container *)instance {
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static sid_file_container * instance;
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@synchronized(self) {
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if (!instance) {
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instance = [[self alloc] init];
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}
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}
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return instance;
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}
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- (sid_file_container *)init
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{
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if ((self = [super init]))
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{
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lock = [[NSLock alloc] init];
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list = [[NSMutableDictionary alloc] initWithCapacity:0];
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}
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return self;
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}
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- (void)add_hint:(NSString *)path source:(id)source
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{
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[lock lock];
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[list setObject:source forKey:path];
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[lock unlock];
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}
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- (void)remove_hint:(NSString *)path
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{
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[lock lock];
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[list removeObjectForKey:path];
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[lock unlock];
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}
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- (BOOL)try_hint:(NSString *)path source:(id *)source
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{
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[lock lock];
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*source = [list objectForKey:path];
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[lock unlock];
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if ( *source )
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{
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[ *source seek:0 whence:0 ];
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return YES;
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}
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else
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{
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return NO;
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}
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}
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@end
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static void sidTuneLoader(const char* fileName, std::vector<uint8_t>& bufferRef) {
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id<CogSource> source;
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if ( ![[sid_file_container instance] try_hint:[NSString stringWithUTF8String:fileName] source:&source] ) {
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NSString * urlString = [NSString stringWithUTF8String:fileName];
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NSURL * url = [NSURL URLWithDataRepresentation:[urlString dataUsingEncoding:NSUTF8StringEncoding] relativeToURL:nil];
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id audioSourceClass = NSClassFromString(@"AudioSource");
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source = [audioSourceClass audioSourceForURL:url];
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if (![source open:url])
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return;
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if (![source seekable])
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return;
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}
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[source seek:0 whence:SEEK_END];
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long size = [source tell];
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[source seek:0 whence:SEEK_SET];
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bufferRef.resize( size );
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[source read:&bufferRef[0] amount:size];
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[source close];
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}
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@implementation SidDecoder
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- (BOOL)open:(id<CogSource>)s
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{
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if (![s seekable])
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return NO;
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[self setSource:s];
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NSString * path = [[s url] absoluteString];
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NSRange fragmentRange = [path rangeOfString:@"#" options:NSBackwardsSearch];
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if (fragmentRange.location != NSNotFound) {
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path = [path substringToIndex:fragmentRange.location];
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}
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currentUrl = [path stringByRemovingPercentEncoding];
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[[sid_file_container instance] add_hint:currentUrl source:s];
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hintAdded = YES;
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NSString * extension = [[s url] pathExtension];
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const char ** extList = [extension isEqualToString:@"mus"] ? extListStr : extListEmpty;
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tune = new SidTune(sidTuneLoader, [currentUrl UTF8String], extList, true);
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if (!tune->getStatus())
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return NO;
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NSURL * url = [s url];
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int track_num;
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if ([[url fragment] length] == 0)
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track_num = 1;
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else
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track_num = [[url fragment] intValue];
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n_channels = 1;
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length = 3 * 60 * 44100;
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tune->selectSong( track_num );
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engine = new sidplayfp;
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engine->setRoms( kernel, basic, chargen );
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if ( !engine->load( tune ) )
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return NO;
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ReSIDfpBuilder * _builder = new ReSIDfpBuilder("ReSIDfp");
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builder = _builder;
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if (_builder)
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{
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_builder->create((engine->info()).maxsids());
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if (_builder->getStatus())
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{
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_builder->filter(true);
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_builder->filter6581Curve(0.5);
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_builder->filter8580Curve(0.5);
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}
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if (!_builder->getStatus())
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return NO;
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}
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else return NO;
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const SidTuneInfo *tuneInfo = tune->getInfo();
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SidConfig conf = engine->config();
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conf.frequency = 44100;
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conf.sidEmulation = builder;
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conf.playback = SidConfig::MONO;
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if (tuneInfo && (tuneInfo->sidChips() > 1))
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conf.playback = SidConfig::STEREO;
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if (!engine->config(conf))
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return NO;
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if (conf.playback == SidConfig::STEREO) {
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n_channels = 2;
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}
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renderedTotal = 0;
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fadeTotal = fadeRemain = 44100 * 8;
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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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{
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return [NSDictionary dictionaryWithObjectsAndKeys:
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[NSNumber numberWithInt:0], @"bitrate",
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[NSNumber numberWithFloat:44100], @"sampleRate",
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[NSNumber numberWithDouble:length], @"totalFrames",
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[NSNumber numberWithInt:16], @"bitsPerSample", //Samples are short
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[NSNumber numberWithBool:NO], @"floatingPoint",
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[NSNumber numberWithInt:n_channels], @"channels", //output from gme_play is in stereo
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[NSNumber numberWithBool:[source seekable]], @"seekable",
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@"host", @"endian",
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nil];
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}
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- (int)readAudio:(void *)buf frames:(UInt32)frames
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{
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int total = 0;
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int16_t * sampleBuffer = (int16_t*)buf;
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while ( total < frames ) {
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int framesToRender = 1024;
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if ( framesToRender > frames )
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framesToRender = frames;
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int rendered = engine->play( sampleBuffer + total * n_channels, framesToRender * n_channels ) / n_channels;
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if (rendered <= 0)
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break;
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if (n_channels == 2) {
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for (int i = 0, j = rendered * 2; i < j; i += 2) {
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int16_t * sample = sampleBuffer + total * 2 + i;
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int mid = (int)(sample[0] + sample[1]) / 2;
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int side = (int)(sample[0] - sample[1]) / 4;
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sample[0] = mid + side;
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sample[1] = mid - side;
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}
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}
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renderedTotal += rendered;
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if ( !IsRepeatOneSet() && renderedTotal >= length ) {
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int16_t * sampleBuf = ( int16_t * ) buf + total * n_channels;
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long fadeEnd = fadeRemain - rendered;
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if ( fadeEnd < 0 )
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fadeEnd = 0;
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float fadePosf = (float)fadeRemain / (float)fadeTotal;
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const float fadeStep = 1.0f / (float)fadeTotal;
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for ( long fadePos = fadeRemain; fadePos > fadeEnd; --fadePos, fadePosf -= fadeStep ) {
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long offset = (fadeRemain - fadePos) * n_channels;
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float sampleLeft = sampleBuf[ offset + 0 ];
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sampleLeft *= fadePosf;
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sampleBuf[ offset + 0 ] = (int16_t)sampleLeft;
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if (n_channels == 2)
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{
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float sampleRight = sampleBuf[ offset + 1 ];
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sampleRight *= fadePosf;
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sampleBuf[ offset + 1 ] = (int16_t)sampleRight;
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}
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}
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rendered = (int)(fadeRemain - fadeEnd);
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fadeRemain = fadeEnd;
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}
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total += rendered;
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if ( rendered < framesToRender )
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break;
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}
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return total;
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}
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- (long)seek:(long)frame
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{
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if (frame < renderedTotal) {
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engine->load(tune);
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renderedTotal = 0;
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}
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int16_t sampleBuffer[1024 * 2];
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long remain = ( frame - renderedTotal ) % 32;
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frame /= 32;
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renderedTotal /= 32;
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engine->fastForward( 100 * 32 );
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while ( renderedTotal < frame )
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{
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long todo = frame - renderedTotal;
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if ( todo > 1024 )
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todo = 1024;
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int done = engine->play( sampleBuffer, (uint_least32_t)(todo * n_channels) ) / n_channels;
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if ( done < todo )
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{
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if ( engine->error() )
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return -1;
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renderedTotal = length;
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break;
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}
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renderedTotal += todo;
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}
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renderedTotal *= 32;
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engine->fastForward( 100 );
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if ( remain )
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renderedTotal += engine->play( sampleBuffer, (uint_least32_t)(remain * n_channels) ) / n_channels;
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return renderedTotal;
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}
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- (void)cleanUp
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{
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if (builder)
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{
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delete builder;
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builder = NULL;
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}
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if (engine)
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{
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delete engine;
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engine = NULL;
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}
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if (tune)
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{
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delete tune;
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tune = NULL;
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}
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source = nil;
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if (hintAdded) {
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[[sid_file_container instance] remove_hint:currentUrl];
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hintAdded = NO;
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}
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currentUrl = nil;
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}
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- (void)close
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{
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[self cleanUp];
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}
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- (void)dealloc
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{
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[self close];
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}
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- (void)setSource:(id<CogSource>)s
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{
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source = s;
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}
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- (id<CogSource>)source
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{
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return source;
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}
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+ (NSArray *)fileTypes
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{
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return [NSArray arrayWithObjects:@"sid", @"mus", nil];
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}
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+ (NSArray *)mimeTypes
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{
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return nil;
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}
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+ (float)priority
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{
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return 0.5;
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}
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@end
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