443 lines
9.4 KiB
Plaintext
443 lines
9.4 KiB
Plaintext
//
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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_object : NSObject {
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size_t refCount;
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NSString *path;
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NSData *data;
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}
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@property size_t refCount;
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@property NSString *path;
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@property NSData *data;
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@end
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@implementation sid_file_object
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@synthesize refCount;
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@synthesize path;
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@synthesize data;
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@end
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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 data:(NSData **)data;
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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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if((self = [super init])) {
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lock = [[NSLock alloc] init];
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list = [[NSMutableDictionary alloc] init];
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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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[lock lock];
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sid_file_object *obj = [list objectForKey:path];
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if(obj) {
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obj.refCount += 1;
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[lock unlock];
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return;
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}
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[lock unlock];
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obj = [[sid_file_object alloc] init];
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obj.refCount = 1;
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if(![source seekable])
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return;
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[source seek:0 whence:SEEK_END];
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size_t fileSize = [source tell];
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void *dataBytes = malloc(fileSize);
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if(!dataBytes)
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return;
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[source seek:0 whence:SEEK_SET];
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[source read:dataBytes amount:fileSize];
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NSData *data = [NSData dataWithBytes:dataBytes length:fileSize];
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free(dataBytes);
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obj.path = path;
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obj.data = data;
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[lock lock];
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[list setObject:obj 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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[lock lock];
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sid_file_object *obj = [list objectForKey:path];
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if(obj.refCount <= 1) {
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[list removeObjectForKey:path];
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} else {
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obj.refCount--;
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}
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[lock unlock];
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}
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- (BOOL)try_hint:(NSString *)path data:(NSData **)data {
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sid_file_object *obj;
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[lock lock];
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obj = [list objectForKey:path];
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[lock unlock];
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if(obj) {
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*data = obj.data;
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return YES;
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} else {
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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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NSData *hintData = nil;
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if(![[sid_file_container instance] try_hint:[NSString stringWithUTF8String:fileName] data:&hintData]) {
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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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id<CogSource> 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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[source seek:0 whence:SEEK_END];
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long fileSize = [source tell];
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[source seek:0 whence:SEEK_SET];
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bufferRef.resize(fileSize);
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[source read:&bufferRef[0] amount:fileSize];
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[source close];
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} else {
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bufferRef.resize([hintData length]);
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memcpy(&bufferRef[0], [hintData bytes], [hintData length]);
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}
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}
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@implementation SidDecoder
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// Need this static initializer to create the static global tables that sidplayfp doesn't really lock access to
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+ (void)initialize {
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ReSIDfpBuilder *builder = new ReSIDfpBuilder("ReSIDfp");
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if(builder) {
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builder->create(1);
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if(builder->getStatus()) {
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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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delete builder;
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}
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}
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- (BOOL)open:(id<CogSource>)s {
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if(![s seekable])
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return NO;
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[self setSource:s];
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sampleRate = [[[[NSUserDefaultsController sharedUserDefaultsController] defaults] valueForKey:@"synthSampleRate"] doubleValue];
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if(sampleRate < 8000.0) {
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sampleRate = 44100.0;
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} else if(sampleRate > 192000.0) {
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sampleRate = 192000.0;
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}
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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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double defaultLength = [[[[NSUserDefaultsController sharedUserDefaultsController] defaults] valueForKey:@"synthDefaultSeconds"] doubleValue];
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length = (int)ceil(sampleRate * defaultLength);
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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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_builder->create((engine->info()).maxsids());
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if(_builder->getStatus()) {
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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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} else
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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 = (int)ceil(sampleRate);
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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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double defaultFade = [[[[NSUserDefaultsController sharedUserDefaultsController] defaults] valueForKey:@"synthDefaultFadeSeconds"] doubleValue];
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if(defaultFade < 0.0) {
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defaultFade = 0.0;
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}
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renderedTotal = 0;
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fadeTotal = fadeRemain = (int)ceil(sampleRate * defaultFade);
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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": @(sampleRate),
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@"totalFrames": @(length),
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@"bitsPerSample": @(16),
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@"floatingPoint": @(NO),
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@"channels": @(n_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 total = 0;
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id audioChunkClass = NSClassFromString(@"AudioChunk");
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AudioChunk *chunk = [[audioChunkClass alloc] initWithProperties:[self properties]];
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int16_t buffer[1024 * n_channels];
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int framesToRender = 1024;
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int rendered = engine->play(buffer, framesToRender * n_channels) / n_channels;
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if(rendered <= 0)
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return nil;
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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 = buffer + 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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if(!IsRepeatOneSet() && renderedTotal >= length) {
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int16_t *sampleBuf = buffer;
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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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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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[chunk assignSamples:buffer frameCount:rendered];
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return chunk;
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}
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- (long)seek:(long)frame {
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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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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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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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if(builder) {
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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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delete engine;
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engine = NULL;
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}
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if(tune) {
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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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[self cleanUp];
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}
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- (void)dealloc {
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[self 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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+ (NSArray *)fileTypes {
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return @[@"sid", @"mus"];
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}
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+ (NSArray *)mimeTypes {
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return nil;
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}
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+ (float)priority {
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return 0.5;
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}
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+ (NSArray *)fileTypeAssociations {
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return @[
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@[@"SID File", @"vg.icns", @"sid"],
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@[@"SID MUS File", @"song.icns", @"mus"]
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];
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}
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@end
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