cog/Plugins/GME/GameDecoder.m

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2007-10-11 23:11:58 +00:00
//
// GameFile.m
// Cog
//
// Created by Vincent Spader on 5/29/06.
// Copyright 2006 Vincent Spader. All rights reserved.
//
#import "GameDecoder.h"
#import "Logging.h"
#import "PlaylistController.h"
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@implementation GameDecoder
gme_err_t readCallback(void *data, void *out, int count) {
id source = (__bridge id)data;
DLog(@"Amount: %i", count);
int n = (int)[source read:out amount:count];
DLog(@"Read: %i", n);
if(n <= 0) {
DLog(@"ERROR!");
return (gme_err_t)1; // Return non-zero for error
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}
return 0; // Return 0 for no error
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}
- (id)init {
self = [super init];
if(self) {
emu = NULL;
}
return self;
}
- (BOOL)open:(id<CogSource>)s {
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[self setSource:s];
// We need file-size to use GME
if(![source seekable]) {
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return NO;
}
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gme_err_t error;
NSString *ext = [[[source url] pathExtension] lowercaseString];
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gme_type_t type = gme_identify_extension([ext UTF8String]);
if(!type) {
ALog(@"GME: No type!");
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return NO;
}
sampleRate = 44100;
if(type == gme_spc_type || type == gme_sfm_type)
sampleRate = 32000;
emu = gme_new_emu(type, (int)sampleRate);
if(!emu) {
ALog(@"GME: No new emu!");
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return NO;
}
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[source seek:0 whence:SEEK_END];
long size = [source tell];
[source seek:0 whence:SEEK_SET];
DLog(@"Size: %li", size);
error = gme_load_custom(emu, readCallback, size, (__bridge void *)(s));
if(error) {
ALog(@"GME: ERROR Loding custom!");
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return NO;
}
NSURL *m3uurl = [[source url] URLByDeletingPathExtension];
m3uurl = [m3uurl URLByAppendingPathExtension:@"m3u"];
id audioSourceClass = NSClassFromString(@"AudioSource");
id<CogSource> m3usrc = [audioSourceClass audioSourceForURL:m3uurl];
if([m3usrc open:m3uurl]) {
if([m3usrc seekable]) {
[m3usrc seek:0 whence:SEEK_END];
long size = [m3usrc tell];
[m3usrc seek:0 whence:SEEK_SET];
void *data = malloc(size);
[m3usrc read:data amount:size];
gme_load_m3u_data(emu, data, size);
free(data);
}
}
int track_num = [[[source url] fragment] intValue]; // What if theres no fragment? Assuming we get 0.
gme_info_t *info;
error = gme_track_info(emu, &info, track_num);
if(error) {
ALog(@"Unable to get track info");
return NO;
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}
// As recommended
if(info->length > 0) {
DLog(@"Using length: %i", info->length);
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length = info->length;
} else if(info->loop_length > 0) {
DLog(@"Using loop length: %i", info->loop_length);
length = info->intro_length + 2 * info->loop_length;
} else {
length = 150000;
DLog(@"Setting default: %li", length);
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}
if(info->fade_length >= 0) {
fade = info->fade_length;
} else {
fade = 8000;
}
gme_free_info(info);
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DLog(@"Length: %li", length);
DLog(@"Track num: %i", track_num);
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error = gme_start_track(emu, track_num);
if(error) {
ALog(@"GME: Error starting track");
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return NO;
}
length += fade;
[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
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return YES;
}
- (NSDictionary *)properties {
return @{ @"bitrate": @(0),
@"sampleRate": @(sampleRate),
@"totalFrames": @((long)(length * ((float)sampleRate * 0.001))),
@"bitsPerSample": @(sizeof(short) * 8), // Samples are short
@"channels": @(2), // output from gme_play is in stereo
@"seekable": @(YES),
@"endian": @"host",
@"encoding": @"synthesized" };
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}
- (NSDictionary *)metadata {
return @{};
}
- (int)readAudio:(void *)buf frames:(UInt32)frames {
int numSamples = frames * 2; // channels = 2
if(gme_track_ended(emu)) {
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return 0;
}
if(IsRepeatOneSet())
gme_set_fade(emu, -1, 0);
else
gme_set_fade(emu, (int)(length - fade), (int)fade);
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gme_play(emu, numSamples, (short int *)buf);
// Some formats support length, but we'll add that in the future.
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//(From gme.txt) If track length, then use it. If loop length, play for intro + loop * 2. Otherwise, default to 2.5 minutes
return frames; // GME will always generate samples. There's no real EOS.
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}
- (long)seek:(long)frame {
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gme_err_t error;
error = gme_seek(emu, frame / 44.1);
if(error) {
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return -1;
}
return frame;
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}
- (void)close {
if(emu) {
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gme_delete(emu);
emu = NULL;
}
}
- (void)dealloc {
[self close];
}
+ (NSArray *)fileTypes {
return @[@"ay", @"gbs", @"hes", @"kss", @"nsf", @"nsfe", @"sap", @"sfm", @"sgc", @"spc"];
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}
+ (NSArray *)mimeTypes {
return nil;
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}
+ (float)priority {
return 1.0;
}
+ (NSArray *)fileTypeAssociations {
NSMutableArray *ret = [[NSMutableArray alloc] init];
[ret addObject:@"Game Music Emu Files"];
[ret addObject:@"vg.icns"];
[ret addObjectsFromArray:[self fileTypes]];
return @[ret];
}
- (void)setSource:(id<CogSource>)s {
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source = s;
}
- (id<CogSource>)source {
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return source;
}
@end