cog/Plugins/Dumb/DumbDecoder.m

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//
// DumbFile.m
// Cog
//
// Created by Vincent Spader on 5/29/06.
// Copyright 2006 Vincent Spader. All rights reserved.
//
#import "DumbDecoder.h"
@implementation DumbDecoder
int skipCallback(void *f, long n)
{
id source = (id)f;
if (![source seek:n whence: SEEK_CUR])
{
return 1; //Non-zero is error
}
return 0; //Zero for success
}
int getCharCallback(void *f)
{
id source = (id)f;
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unsigned char c;
if ([source read:&c amount:1] < 1)
{
return -1;
}
return c;
}
long readCallback(char *ptr, long n, void *f)
{
id source = (id)f;
return [source read:ptr amount:n];
}
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int seekCallback(void *f, long n)
{
id source = (id)f;
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if (![source seekable]) return -1;
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if ([source seek:n whence:SEEK_SET]) return 0;
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else return -1;
}
long getsizeCallback(void *f)
{
id source = (id)f;
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if (![source seekable]) return 0;
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long current_offset = [source tell];
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[source seek:0 whence:SEEK_END];
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long size = [source tell];
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[source seek:current_offset whence:SEEK_SET];
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return size;
}
void oneTimeInit()
{
static bool initialized = false;
if (!initialized)
{
}
}
DUMBFILE_SYSTEM dfs = {
.open = NULL,
.skip = skipCallback,
.getc = getCharCallback,
.getnc = readCallback,
.close = NULL,
.seek = seekCallback,
.get_size = getsizeCallback
};
- (BOOL)open:(id<CogSource>)s
{
[self setSource:s];
DUMBFILE *df;
// dumb_register_stdfiles();
df = dumbfile_open_ex(s, &dfs);
if (!df)
{
NSLog(@"EX Failed");
return NO;
}
NSString *ext = [[[[s url] path] pathExtension] lowercaseString];
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duh = dumb_read_any(df, [ext isEqualToString:@"mod"] ? 0 : 1, 0);
if (!duh)
{
NSLog(@"Failed to create duh");
dumbfile_close(df);
return NO;
}
dumbfile_close(df);
length = duh_get_length(duh);
dsr = duh_start_sigrenderer(duh, 0, 2 /* stereo */, 0 /* start from the beginning */);
if (!dsr)
{
NSLog(@"Failed to create dsr");
return NO;
}
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DUMB_IT_SIGRENDERER * itsr = duh_get_it_sigrenderer( dsr );
dumb_it_set_ramp_style( itsr, 2 );
[self willChangeValueForKey:@"properties"];
[self didChangeValueForKey:@"properties"];
return YES;
}
- (NSDictionary *)properties
{
return [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:0], @"bitrate",
[NSNumber numberWithFloat:44100], @"sampleRate",
[NSNumber numberWithDouble:((length / 65.536f)*44.1000)], @"totalFrames",
[NSNumber numberWithInt:16], @"bitsPerSample", //Samples are short
[NSNumber numberWithInt:2], @"channels", //output from gme_play is in stereo
[NSNumber numberWithBool:[source seekable]], @"seekable",
@"host", @"endian",
nil];
}
- (int)readAudio:(void *)buf frames:(UInt32)frames
{
if (duh_sigrenderer_get_position(dsr) > length) {
return 0;
}
return duh_render(dsr, 16 /* shorts */, 0 /* not unsigned */, 1.0 /* volume */, 65536.0f / 44100.0f /* 65536 hz? */, frames, buf);
}
- (long)seek:(long)frame
{
double pos = (double)duh_sigrenderer_get_position(dsr) / 65.536f;
double seekPos = frame/44.100;
if (seekPos < pos) {
//Reset. Dumb cannot seek backwards. It's dumb.
[self cleanUp];
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[source seek:0 whence:SEEK_SET];
[self open:source];
pos = 0.0;
}
int numSamples = (seekPos - pos)/1000 * 44100;
duh_sigrenderer_generate_samples(dsr, 1.0f, 65536.0f / 44100.0f, numSamples, NULL);
return frame;
}
- (void)cleanUp
{
if (dsr) {
duh_end_sigrenderer(dsr);
dsr = NULL;
}
if (duh) {
unload_duh(duh);
duh = NULL;
}
}
- (void)close
{
[self cleanUp];
if (source) {
[source close];
[self setSource:nil];
}
}
- (void)setSource:(id<CogSource>)s
{
[s retain];
[source release];
source = s;
}
- (id<CogSource>)source
{
return source;
}
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+ (NSArray *)fileTypes
{
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return [NSArray arrayWithObjects:@"it", @"xm", @"s3m", @"mod", @"stm", @"ptm", @"mtm", @"669", @"psm", @"am", @"dsm", @"amf", @"okt", @"okta", nil];
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}
+ (NSArray *)mimeTypes
{
return [NSArray arrayWithObjects:@"audio/x-it", @"audio/x-xm", @"audio/x-s3m", @"audio/x-mod", nil];
}
@end