cog/Plugins/libvgmPlayer/libvgmMetadataReader.mm

//
//  libvgmMetadataReader.mm
//  libvgmPlayer
//
//  Created by Christopher Snowhill on 1/03/22.
//  Copyright 2022 __LoSnoCo__. All rights reserved.
//

#import "libvgmMetadataReader.h"

#import "libvgmDecoder.h"

#import "Logging.h"

#import <libvgm/utils/MemoryLoader.h>
#import <libvgm/player/s98player.hpp>
#import <libvgm/player/droplayer.hpp>
#import <libvgm/player/vgmplayer.hpp>
#import <libvgm/player/gymplayer.hpp>

@implementation libvgmMetadataReader

#ifdef _DEBUG
const int logLevel = DEVLOG_DEBUG;
#else
const int logLevel = DEVLOG_INFO;
#endif

static UINT8 FilePlayCallback(PlayerBase* player, void* userParam, UINT8 evtType, void* evtParam)
{
	return 0x00;
}

static DATA_LOADER* RequestFileCallback(void* userParam, PlayerBase* player, const char* fileName)
{
	return NULL;
}

static const char* LogLevel2Str(UINT8 level)
{
	static const char* LVL_NAMES[6] = {" ??? ", "Error", "Warn ", "Info ", "Debug", "Trace"};
	if (level >= (sizeof(LVL_NAMES) / sizeof(LVL_NAMES[0])))
		level = 0;
	return LVL_NAMES[level];
}

static void PlayerLogCallback(void* userParam, PlayerBase* player, UINT8 level, UINT8 srcType,
	const char* srcTag, const char* message)
{
	if (level > logLevel)
		return;	// don't print messages with higher verbosity than current log level
	if (srcType == PLRLOGSRC_PLR)
    {
		ALog("[%s] %s: %s", LogLevel2Str(level), player->GetPlayerName(), message);
    }
	else
    {
		ALog("[%s] %s %s: %s", LogLevel2Str(level), player->GetPlayerName(), srcTag, message);
    }
	return;
}

static std::string FCC2Str(UINT32 fcc)
{
    std::string result(4, '\0');
    result[0] = (char)((fcc >> 24) & 0xFF);
    result[1] = (char)((fcc >> 16) & 0xFF);
    result[2] = (char)((fcc >>  8) & 0xFF);
    result[3] = (char)((fcc >>  0) & 0xFF);
    return result;
}

+ (NSArray *)fileTypes
{
	return [libvgmDecoder fileTypes];
}

+ (NSArray *)mimeTypes
{
	return [libvgmDecoder mimeTypes];
}

+ (float)priority
{
    return [libvgmDecoder priority];
}

+ (NSDictionary *)metadataForURL:(NSURL *)url
{
    id audioSourceClass = NSClassFromString(@"AudioSource");
    id<CogSource> source = [audioSourceClass audioSourceForURL:url];
    
    if (![source open:url])
        return 0;
    
    if (![source seekable])
        return 0;

	PlayerA mainPlr;
	mainPlr.RegisterPlayerEngine(new VGMPlayer);
	mainPlr.RegisterPlayerEngine(new S98Player);
	mainPlr.RegisterPlayerEngine(new DROPlayer);
	mainPlr.RegisterPlayerEngine(new GYMPlayer);
	mainPlr.SetEventCallback(FilePlayCallback, NULL);
	mainPlr.SetFileReqCallback(RequestFileCallback, NULL);
	mainPlr.SetLogCallback(PlayerLogCallback, NULL);
	mainPlr.SetOutputSettings(44100, 2, 24, 2048);

	[source seek:0 whence:SEEK_END];
	size_t size = [source tell];
	[source seek:0 whence:SEEK_SET];

	UINT8* fileData = (UINT8*) malloc(size);
	if (!fileData)
		return 0;

	size_t bytesRead = [source read:fileData amount:size];

	if (bytesRead != size)
	{
		free(fileData);
		return 0;
	}

	DATA_LOADER *dLoad = MemoryLoader_Init(fileData, (unsigned int)size);
	if (!dLoad)
	{
		free(fileData);
		return 0;
	}

	DataLoader_SetPreloadBytes(dLoad,0x100);
	if (DataLoader_Load(dLoad))
	{
		DataLoader_Deinit(dLoad);
		free(fileData);
		return 0;
	}

	if (mainPlr.LoadFile(dLoad))
	{
		DataLoader_Deinit(dLoad);
		free(fileData);
		return 0;
	}

	NSString *system = @"";
	NSString *title = @"";
	NSString *artist = @"";
	NSString *album = @"";
	NSNumber *year = [NSNumber numberWithInt:0];

	PlayerBase* player = mainPlr.GetPlayer();

	const char* const* tagList = player->GetTags();
	for (const char* const* t = tagList; *t; t += 2)
	{
		if (!strcmp(t[0], "TITLE"))
			title = [NSString stringWithUTF8String:t[1]];
		else if (!strcmp(t[0], "ARTIST"))
			artist = [NSString stringWithUTF8String:t[1]];
		else if (!strcmp(t[0], "GAME"))
			album = [NSString stringWithUTF8String:t[1]];
		else if (!strcmp(t[0], "DATE"))
		{
			char * end;
			unsigned long theYear = strtoul(t[1], &end, 10);
			year = [NSNumber numberWithLong:theYear];
		}
	}

	PLR_SONG_INFO sInf;
	player->GetSongInfo(sInf);

	system = [NSString stringWithFormat:@"%s v%X.%X", FCC2Str(sInf.format).c_str(), sInf.fileVerMaj, sInf.fileVerMin];

	mainPlr.UnloadFile();
	DataLoader_Deinit(dLoad);
	free(fileData);
    
    NSDictionary * dict = [NSDictionary dictionaryWithObjectsAndKeys:
		system, @"codec",
		album, @"album",
		title, @"title",
		artist, @"artist",
		year, @"year",
		nil];
    
    return dict;
}

@end