ppsspp/Core/HLE/sceMp3.cpp

// Copyright (c) 2012- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#include <map>
#include <algorithm>

#include "Core/Config.h"
#include "Core/HLE/HLE.h"
#include "Core/HLE/FunctionWrappers.h"
#include "Core/HLE/sceMp3.h"
#include "Core/HW/MediaEngine.h"
#include "Core/MemMap.h"
#include "Core/Reporting.h"
#include "Core/HW/SimpleAudioDec.h"

static const u32 ERROR_MP3_INVALID_HANDLE = 0x80671001;
static const u32 ERROR_MP3_UNRESERVED_HANDLE = 0x80671102;
static const u32 ERROR_MP3_NOT_YET_INIT_HANDLE = 0x80671103;
static const u32 ERROR_MP3_NO_RESOURCE_AVAIL = 0x80671201;
static const u32 ERROR_MP3_BAD_ADDR = 0x80671002;
static const u32 ERROR_MP3_BAD_SIZE = 0x80671003;
static const u32 ERROR_AVCODEC_INVALID_DATA = 0x807f00fd;
static const int AU_BUF_MIN_SIZE = 8192;
static const int PCM_BUF_MIN_SIZE = 9216;
static const size_t MP3_MAX_HANDLES = 2;

struct Mp3Context {
public:

	int mp3StreamStart;
	int mp3StreamEnd;
	u32 mp3Buf;
	int mp3BufSize;
	u32 mp3PcmBuf;
	int mp3PcmBufSize;

	int readPosition;

	int bufferRead;
	int bufferWrite;
	int bufferAvailable;

	int mp3DecodedBytes;
	int mp3LoopNum;
	int mp3MaxSamples;
	int mp3SumDecodedSamples;

	int mp3Channels;
	int mp3Bitrate;
	int mp3SamplingRate;
	int mp3Version;

	void DoState(PointerWrap &p) {
		auto s = p.Section("Mp3Context", 1);
		if (!s)
			return;

		p.Do(mp3StreamStart);
		p.Do(mp3StreamEnd);
		p.Do(mp3Buf);
		p.Do(mp3BufSize);
		p.Do(mp3PcmBuf);
		p.Do(mp3PcmBufSize);
		p.Do(readPosition);
		p.Do(bufferRead);
		p.Do(bufferWrite);
		p.Do(bufferAvailable);
		p.Do(mp3DecodedBytes);
		p.Do(mp3LoopNum);
		p.Do(mp3MaxSamples);
		p.Do(mp3SumDecodedSamples);
		p.Do(mp3Channels);
		p.Do(mp3Bitrate);
		p.Do(mp3SamplingRate);
		p.Do(mp3Version);
	};
};

static std::map<u32, AuCtx *> mp3Map;
static const int mp3DecodeDelay = 4000;
static bool resourceInited = false;

static AuCtx *getMp3Ctx(u32 mp3) {
	if (mp3Map.find(mp3) == mp3Map.end())
		return NULL;
	return mp3Map[mp3];
}

void __Mp3Shutdown() {
	for (auto it = mp3Map.begin(), end = mp3Map.end(); it != end; ++it) {
		delete it->second;
	}
	mp3Map.clear();
}

void __Mp3DoState(PointerWrap &p) {
	auto s = p.Section("sceMp3", 0, 3);
	if (!s)
		return;

	if (s >= 2) {
		p.Do(mp3Map);
	} else {
		std::map<u32, Mp3Context *> mp3Map_old;
		p.Do(mp3Map_old); // read old map
		for (auto it = mp3Map_old.begin(), end = mp3Map_old.end(); it != end; ++it) {
			auto mp3 = new AuCtx;
			u32 id = it->first;
			auto mp3_old = it->second;
			mp3->AuBuf = mp3_old->mp3Buf;
			mp3->AuBufSize = mp3_old->mp3BufSize;
			mp3->PCMBuf = mp3_old->mp3PcmBuf;
			mp3->PCMBufSize = mp3_old->mp3PcmBufSize;
			mp3->BitRate = mp3_old->mp3Bitrate;
			mp3->Channels = mp3_old->mp3Channels;
			mp3->endPos = mp3_old->mp3StreamEnd;
			mp3->startPos = mp3_old->mp3StreamStart;
			mp3->LoopNum = mp3_old->mp3LoopNum;
			mp3->SamplingRate = mp3_old->mp3SamplingRate;
			mp3->freq = mp3->SamplingRate;
			mp3->SumDecodedSamples = mp3_old->mp3SumDecodedSamples;
			mp3->Version = mp3_old->mp3Version;
			mp3->MaxOutputSample = mp3_old->mp3MaxSamples;
			mp3->readPos = mp3_old->readPosition;
			mp3->AuBufAvailable = 0; // reset to read from file
			mp3->askedReadSize = 0;

			mp3->audioType = PSP_CODEC_MP3;
			mp3->decoder = new SimpleAudio(mp3->audioType);
			mp3Map[id] = mp3;
		}
	}

	if (s >= 3) {
		p.Do(resourceInited);
	} else {
		// Previous behavior acted as if it was already inited.
		resourceInited = true;
	}
}

static int sceMp3Decode(u32 mp3, u32 outPcmPtr) {
	DEBUG_LOG(ME, "sceMp3Decode(%08x,%08x)", mp3, outPcmPtr);

	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}
		
	int pcmBytes = ctx->AuDecode(outPcmPtr);
	if (!pcmBytes) {
		// decode data successfully, delay thread
		hleDelayResult(pcmBytes, "mp3 decode", mp3DecodeDelay);
	}
	return pcmBytes;
}

static int sceMp3ResetPlayPosition(u32 mp3) {
	DEBUG_LOG(ME, "SceMp3ResetPlayPosition(%08x)", mp3);

	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}

	return ctx->AuResetPlayPosition();
}

static int sceMp3CheckStreamDataNeeded(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "unreserved handle");
	} else if (ctx->AuBuf == 0) {
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "incorrect handle type");
	}

	return hleLogSuccessI(ME, ctx->AuCheckStreamDataNeeded());
}

static u32 sceMp3ReserveMp3Handle(u32 mp3Addr) {
	if (!resourceInited) {
		return hleLogError(ME, ERROR_MP3_NO_RESOURCE_AVAIL, "sceMp3InitResource must be called first");
	}
	if (mp3Map.size() >= MP3_MAX_HANDLES) {
		return hleLogError(ME, ERROR_MP3_NO_RESOURCE_AVAIL, "no free handles");
	}
	if (mp3Addr != 0 && !Memory::IsValidRange(mp3Addr, 32)) {
		// The PSP would crash, but might as well return a proper error.
		return hleLogError(ME, SCE_KERNEL_ERROR_INVALID_POINTER, "bad mp3 pointer");
	}

	AuCtx *Au = new AuCtx;
	if (mp3Addr) {
		Au->startPos = Memory::Read_U64(mp3Addr); // Audio stream start position.
		Au->endPos = Memory::Read_U64(mp3Addr + 8); // Audio stream end position.
		Au->AuBuf = Memory::Read_U32(mp3Addr + 16); // Input Au data buffer.
		Au->AuBufSize = Memory::Read_U32(mp3Addr + 20); // Input Au data buffer size.
		Au->PCMBuf = Memory::Read_U32(mp3Addr + 24); // Output PCM data buffer.
		Au->PCMBufSize = Memory::Read_U32(mp3Addr + 28); // Output PCM data buffer size.

		if (Au->startPos >= Au->endPos) {
			delete Au;
			return hleLogError(ME, ERROR_MP3_BAD_SIZE, "start must be before end");
		}
		if (!Au->AuBuf || !Au->PCMBuf) {
			delete Au;
			return hleLogError(ME, ERROR_MP3_BAD_ADDR, "invalid buffer addresses");
		}
		if ((int)Au->AuBufSize < AU_BUF_MIN_SIZE || (int)Au->PCMBufSize < PCM_BUF_MIN_SIZE) {
			delete Au;
			return hleLogError(ME, ERROR_MP3_BAD_SIZE, "buffers too small");
		}

		DEBUG_LOG(ME, "startPos %llx endPos %llx mp3buf %08x mp3bufSize %08x PCMbuf %08x PCMbufSize %08x",
			Au->startPos, Au->endPos, Au->AuBuf, Au->AuBufSize, Au->PCMBuf, Au->PCMBufSize);
	} else {
		Au->startPos = 0;
		Au->endPos = 0;
		Au->AuBuf = 0;
		Au->AuBufSize = 0;
		Au->PCMBuf = 0;
		Au->PCMBufSize = 0;
	}

	Au->SumDecodedSamples = 0;
	Au->LoopNum = -1;
	Au->AuBufAvailable = 0;
	Au->readPos = Au->startPos;

	Au->audioType = PSP_CODEC_MP3;
	Au->decoder = new SimpleAudio(Au->audioType);

	int handle = (int)mp3Map.size();
	mp3Map[handle] = Au;

	return hleLogSuccessI(ME, handle);
}

static int sceMp3InitResource() {
	// TODO: Could validate the utility modules have been loaded?
	if (resourceInited) {
		return hleLogSuccessI(ME, 0);
	}
	resourceInited = true;
	return hleLogSuccessI(ME, hleDelayResult(0, "mp3 resource init", 200));
}

static int sceMp3TermResource() {
	if (!resourceInited) {
		return hleLogSuccessI(ME, 0);
	}

	// Free any handles that are still open.
	for (auto au : mp3Map) {
		delete au.second;
	}
	mp3Map.clear();

	resourceInited = false;
	return hleLogSuccessI(ME, hleDelayResult(0, "mp3 resource term", 100));
}

static int __CalculateMp3Channels(int bitval) {
	if (bitval == 0 || bitval == 1 || bitval == 2) { // Stereo / Joint Stereo / Dual Channel.
		return 2;
	}
	else if (bitval == 3) { // Mono.
		return 1;
	}
	else {
		return -1;
	}
}

static int __CalculateMp3SampleRates(int bitval, int mp3version) {
	if (mp3version == 3) { // MPEG Version 1
		int valuemapping[] = { 44100, 48000, 32000, -1 };
		return valuemapping[bitval];
	}
	else if (mp3version == 2) { // MPEG Version 2
		int valuemapping[] = { 22050, 24000, 16000, -1 };
		return valuemapping[bitval];
	}
	else if (mp3version == 0) { // MPEG Version 2.5
		int valuemapping[] = { 11025, 12000, 8000, -1 };
		return valuemapping[bitval];
	}
	else {
		return -1;
	}
}

static int __CalculateMp3Bitrates(int bitval, int mp3version, int mp3layer) {
	if (mp3version == 3) { // MPEG Version 1
		if (mp3layer == 3) { // Layer I
			int valuemapping[] = { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, -1 };
			return valuemapping[bitval];
		}
		else if (mp3layer == 2) { // Layer II
			int valuemapping[] = { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, -1 };
			return valuemapping[bitval];
		}
		else if (mp3layer == 1) { // Layer III
			int valuemapping[] = { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, -1 };
			return valuemapping[bitval];
		}
		else {
			return -1;
		}
	}
	else if (mp3version == 2 || mp3version == 0) { // MPEG Version 2 or 2.5
		if (mp3layer == 3) { // Layer I
			int valuemapping[] = { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, -1 };
			return valuemapping[bitval];
		}
		else if (mp3layer == 1 || mp3layer == 2) { // Layer II or III
			int valuemapping[] = { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1 };
			return valuemapping[bitval];
		}
		else {
			return -1;
		}
	}
	else {
		return -1;
	}
}

static int CalculateMp3SamplesPerFrame(int versionBits, int layerBits) {
	if (versionBits == 1 || layerBits == 0) {
		return -1;
	} else if (layerBits == 3) {
		return 384;
	} else if (layerBits == 2 || versionBits == 3) {
		return 1152;
	} else {
		return 576;
	}
}

static int ParseMp3Header(AuCtx *ctx, int offset, bool *isID3) {
	u32 ptr = ctx->AuBuf + ctx->AuStreamWorkareaSize() + offset;
	int header = bswap32(Memory::Read_U32(ptr));
	// ID3 tag , can be seen in Hanayaka Nari Wa ga Ichizoku.
	static const int ID3 = 0x49443300;
	if ((header & 0xFFFFFF00) == ID3) {
		*isID3 = true;
		// TODO: Can we count on startPos being read already?  What if it's past the buffer size?
		int size = bswap32(Memory::Read_U32(ptr + ctx->startPos + 6));
		// Highest bit of each byte has to be ignored (format: 0x7F7F7F7F)
		size = (size & 0x7F) | ((size & 0x7F00) >> 1) | ((size & 0x7F0000) >> 2) | ((size & 0x7F000000) >> 3);
		header = bswap32(Memory::Read_U32(ptr + ctx->startPos + 10 + size));
	}
	return header;
}

static int sceMp3Init(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "unreserved handle");
	} else if (ctx->AuBuf == 0) {
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "incorrect handle type");
	}

	// First, let's search for the MP3 header.  It can be offset by at most 1439 bytes.
	bool hasID3Tag = false;
	int header = 0;
	for (int offset = 0; offset < 1440; ++offset) {
		header = ParseMp3Header(ctx, offset, &hasID3Tag);
		// If we hit valid sync bits, then we've found a header.
		if (((header >> 21) & 0x0FFE) == 0x0FFE) {
			// Ignore the data before that.
			ctx->EatSourceBuff(offset);
			break;
		}
	}

	static const int PARSE_DELAY_MS = 500;

	// Couldn't find a header after all?
	if (((header >> 21) & 0x0FFE) != 0x0FFE) {
		return hleDelayResult(hleLogWarning(ME, ERROR_AVCODEC_INVALID_DATA, "no header found"), "mp3 init", PARSE_DELAY_MS);
	}

	// Parse the Mp3 header
	int layer = (header >> 17) & 0x3;
	ctx->Version = ((header >> 19) & 0x3);
	ctx->SamplingRate = __CalculateMp3SampleRates((header >> 10) & 0x3, ctx->Version);
	ctx->Channels = __CalculateMp3Channels((header >> 6) & 0x3);
	ctx->BitRate = __CalculateMp3Bitrates((header >> 12) & 0xF, ctx->Version, layer);
	ctx->MaxOutputSample = CalculateMp3SamplesPerFrame(ctx->Version, layer);
	ctx->freq = ctx->SamplingRate;

	// for mp3, if required freq is 48000, reset resampling Frequency to 48000 seems get better sound quality (e.g. Miku Custom BGM)
	if (ctx->freq == 48000) {
		ctx->decoder->SetResampleFrequency(ctx->freq);
	}

	// For mp3 file, if ID3 tag is detected, we must move startPos to 0x400 (stream start position), remove 0x400 bytes of the sourcebuff, and reduce the available buffer size by 0x400
	// this is very important for ID3 tag mp3, since our universal audio decoder is for decoding stream part only.
	if (hasID3Tag) {
		// if get ID3 tage, we will decode from 0x400
		ctx->startPos = 0x400;
		ctx->EatSourceBuff(0x400);
	} else {
		// if no ID3 tag, we will decode from the begining of the file
		// TODO: This seems wrong, since it's an init parameter?
		ctx->startPos = 0;
	}

	DEBUG_LOG(ME, "sceMp3Init(): channels=%i, samplerate=%iHz, bitrate=%ikbps", ctx->Channels, ctx->SamplingRate, ctx->BitRate);

	if (layer != 1) {
		// TODO: Should return ERROR_AVCODEC_INVALID_DATA.
		WARN_LOG_REPORT(ME, "sceMp3Init: invalid data: not layer 3");
	}
	if (ctx->Version != 3) {
		// TODO: Should return 0x80671301 (unsupported version?)
		WARN_LOG_REPORT(ME, "sceMp3Init: invalid data: not MPEG v1");
	}
	if (ctx->BitRate == 0 || ctx->BitRate == -1) {
		return hleDelayResult(hleReportError(ME, ERROR_AVCODEC_INVALID_DATA, "invalid bitrate v%d l%d rate %04x", ctx->Version, layer, (header >> 12) & 0xF), "mp3 init", PARSE_DELAY_MS);
	}
	if (ctx->SamplingRate == -1) {
		return hleDelayResult(hleReportError(ME, ERROR_AVCODEC_INVALID_DATA, "invalid sample rate v%d l%d rate %02x", ctx->Version, layer, (header >> 10) & 0x3), "mp3 init", PARSE_DELAY_MS);
	} else if (ctx->SamplingRate != 44100) {
		// TODO: Should return 0x80671302 (unsupported sample rate?)
		WARN_LOG_REPORT(ME, "sceMp3Init: invalid data: not 44.1kHz");
	}

	return hleDelayResult(hleLogSuccessI(ME, 0), "mp3 init", PARSE_DELAY_MS);
}

static int sceMp3GetLoopNum(u32 mp3) {
	DEBUG_LOG(ME, "sceMp3GetLoopNum(%08x)", mp3);

	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}

	return ctx->AuGetLoopNum();
}

static int sceMp3GetMaxOutputSample(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "unreserved handle");
	} else if (ctx->Version < 0) {
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "not yet init");
	} else if (ctx->AuBuf == 0) {
		return hleLogWarning(ME, 0, "no channel available for low level");
	}

	return hleLogSuccessI(ME, ctx->AuGetMaxOutputSample());
}

static int sceMp3GetSumDecodedSample(u32 mp3) {
	INFO_LOG(ME, "sceMp3GetSumDecodedSample(%08X)", mp3);

	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}

	return ctx->AuGetSumDecodedSample();
}

static int sceMp3SetLoopNum(u32 mp3, int loop) {
	INFO_LOG(ME, "sceMp3SetLoopNum(%08X, %i)", mp3, loop);

	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}

	return ctx->AuSetLoopNum(loop);
}

static int sceMp3GetMp3ChannelNum(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "unreserved handle");
	} else if (ctx->Version < 0) {
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "not yet init");
	} else if (ctx->AuBuf == 0) {
		return hleLogWarning(ME, 0, "no channel available for low level");
	}

	return hleLogSuccessI(ME, ctx->AuGetChannelNum());
}

static int sceMp3GetBitRate(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "unreserved handle");
	} else if (ctx->Version < 0) {
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "not yet init");
	} else if (ctx->AuBuf == 0) {
		return hleLogWarning(ME, 0, "no bitrate available for low level");
	}

	return hleLogSuccessI(ME, ctx->AuGetBitRate());
}

static int sceMp3GetSamplingRate(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "unreserved handle");
	} else if (ctx->Version < 0) {
		return hleLogError(ME, ERROR_MP3_NOT_YET_INIT_HANDLE, "not yet init");
	} else if (ctx->AuBuf == 0) {
		return hleLogWarning(ME, 0, "no sample rate available for low level");
	}

	return hleLogSuccessI(ME, ctx->AuGetSamplingRate());
}

static int sceMp3GetInfoToAddStreamData(u32 mp3, u32 dstPtr, u32 towritePtr, u32 srcposPtr) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "unreserved handle");
	} else if (ctx->AuBuf == 0) {
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "incorrect handle type");
	}

	return hleLogSuccessI(ME, ctx->AuGetInfoToAddStreamData(dstPtr, towritePtr, srcposPtr));
}

static int sceMp3NotifyAddStreamData(u32 mp3, int size) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "unreserved handle");
	} else if (ctx->AuBuf == 0) {
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "incorrect handle type");
	}

	return hleLogSuccessI(ME, ctx->AuNotifyAddStreamData(size));
}

static int sceMp3ReleaseMp3Handle(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (ctx) {
		delete ctx;
		mp3Map.erase(mp3);
		return hleLogSuccessI(ME, 0);
	} else if (mp3 >= MP3_MAX_HANDLES) {
		return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
	}

	// Intentionally a zero result.
	return hleLogDebug(ME, 0, "double free ignored");
}

static u32 sceMp3EndEntry() {
	ERROR_LOG_REPORT(ME, "UNIMPL sceMp3EndEntry(...)");
	return 0;
}

static u32 sceMp3StartEntry() {
	ERROR_LOG_REPORT(ME, "UNIMPL sceMp3StartEntry(...)");
	return 0;
}

static u32 sceMp3GetFrameNum(u32 mp3) {
	INFO_LOG(ME, "sceMp3GetFrameNum(%08x)", mp3);
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}
	return ctx->AuGetFrameNum();
}

static u32 sceMp3GetMPEGVersion(u32 mp3) {
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		if (mp3 >= MP3_MAX_HANDLES)
			return hleLogError(ME, ERROR_MP3_INVALID_HANDLE, "invalid handle");
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "unreserved handle");
	} else if (ctx->Version < 0) {
		// Seems to be the wrong error code.
		return hleLogError(ME, ERROR_MP3_UNRESERVED_HANDLE, "not yet init");
	} else if (ctx->AuBuf == 0) {
		return hleLogWarning(ME, 0, "no MPEG version available for low level");
	}

	// Tests have not revealed how to expose more than "3" here as a result.
	return hleReportDebug(ME, ctx->AuGetVersion());
}

static u32 sceMp3ResetPlayPositionByFrame(u32 mp3, int position) {
	DEBUG_LOG(ME, "sceMp3ResetPlayPositionByFrame(%08x, %i)", mp3, position);
	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}

	return ctx->AuResetPlayPositionByFrame(position);
}

static u32 sceMp3LowLevelInit(u32 mp3, u32 unk) {
	INFO_LOG(ME, "sceMp3LowLevelInit(%i, %i)", mp3, unk);
	auto ctx = new AuCtx;

	ctx->audioType = PSP_CODEC_MP3;
	// create mp3 decoder
	ctx->decoder = new SimpleAudio(ctx->audioType);

	// close the audio if mp3 already exists.
	if (mp3Map.find(mp3) != mp3Map.end()) {
		delete mp3Map[mp3];
		mp3Map.erase(mp3);
	}
	mp3Map[mp3] = ctx;

	// Indicate that we've run low level init by setting version to 1.
	ctx->Version = 1;

	return 0;
}

static u32 sceMp3LowLevelDecode(u32 mp3, u32 sourceAddr, u32 sourceBytesConsumedAddr, u32 samplesAddr, u32 sampleBytesAddr) {
	// sourceAddr: input mp3 stream buffer
	// sourceBytesConsumedAddr: consumed bytes decoded in source
	// samplesAddr: output pcm buffer
	// sampleBytesAddr: output pcm size
	DEBUG_LOG(ME, "sceMp3LowLevelDecode(%08x, %08x, %08x, %08x, %08x)", mp3, sourceAddr, sourceBytesConsumedAddr, samplesAddr, sampleBytesAddr);

	AuCtx *ctx = getMp3Ctx(mp3);
	if (!ctx) {
		ERROR_LOG(ME, "%s: bad mp3 handle %08x", __FUNCTION__, mp3);
		return -1;
	}

	if (!Memory::IsValidAddress(sourceAddr) || !Memory::IsValidAddress(sourceBytesConsumedAddr) ||
		!Memory::IsValidAddress(samplesAddr) || !Memory::IsValidAddress(sampleBytesAddr)) {
		ERROR_LOG(ME, "sceMp3LowLevelDecode(%08x, %08x, %08x, %08x, %08x) : invalid address in args", mp3, sourceAddr, sourceBytesConsumedAddr, samplesAddr, sampleBytesAddr);
		return -1;
	}

	auto inbuff = Memory::GetPointer(sourceAddr);
	auto outbuff = Memory::GetPointer(samplesAddr);
	
	int outpcmbytes = 0;
	ctx->decoder->Decode((void*)inbuff, 4096, outbuff, &outpcmbytes);
	
	Memory::Write_U32(ctx->decoder->GetSourcePos(), sourceBytesConsumedAddr);
	Memory::Write_U32(outpcmbytes, sampleBytesAddr);
	return 0;
}

const HLEFunction sceMp3[] = {
	{0X07EC321A, &WrapU_U<sceMp3ReserveMp3Handle>,          "sceMp3ReserveMp3Handle",         'x', "x"    },
	{0X0DB149F4, &WrapI_UI<sceMp3NotifyAddStreamData>,      "sceMp3NotifyAddStreamData",      'i', "xi"   },
	{0X2A368661, &WrapI_U<sceMp3ResetPlayPosition>,         "sceMp3ResetPlayPosition",        'i', "x"    },
	{0X354D27EA, &WrapI_U<sceMp3GetSumDecodedSample>,       "sceMp3GetSumDecodedSample",      'i', "x"    },
	{0X35750070, &WrapI_V<sceMp3InitResource>,              "sceMp3InitResource",             'i', ""     },
	{0X3C2FA058, &WrapI_V<sceMp3TermResource>,              "sceMp3TermResource",             'i', ""     },
	{0X3CEF484F, &WrapI_UI<sceMp3SetLoopNum>,               "sceMp3SetLoopNum",               'i', "xi"   },
	{0X44E07129, &WrapI_U<sceMp3Init>,                      "sceMp3Init",                     'i', "x"    },
	{0X732B042A, &WrapU_V<sceMp3EndEntry>,                  "sceMp3EndEntry",                 'x', ""     },
	{0X7F696782, &WrapI_U<sceMp3GetMp3ChannelNum>,          "sceMp3GetMp3ChannelNum",         'i', "x"    },
	{0X87677E40, &WrapI_U<sceMp3GetBitRate>,                "sceMp3GetBitRate",               'i', "x"    },
	{0X87C263D1, &WrapI_U<sceMp3GetMaxOutputSample>,        "sceMp3GetMaxOutputSample",       'i', "x"    },
	{0X8AB81558, &WrapU_V<sceMp3StartEntry>,                "sceMp3StartEntry",               'x', ""     },
	{0X8F450998, &WrapI_U<sceMp3GetSamplingRate>,           "sceMp3GetSamplingRate",          'i', "x"    },
	{0XA703FE0F, &WrapI_UUUU<sceMp3GetInfoToAddStreamData>, "sceMp3GetInfoToAddStreamData",   'i', "xppp" },
	{0XD021C0FB, &WrapI_UU<sceMp3Decode>,                   "sceMp3Decode",                   'i', "xx"   },
	{0XD0A56296, &WrapI_U<sceMp3CheckStreamDataNeeded>,     "sceMp3CheckStreamDataNeeded",    'i', "x"    },
	{0XD8F54A51, &WrapI_U<sceMp3GetLoopNum>,                "sceMp3GetLoopNum",               'i', "x"    },
	{0XF5478233, &WrapI_U<sceMp3ReleaseMp3Handle>,          "sceMp3ReleaseMp3Handle",         'i', "x"    },
	{0XAE6D2027, &WrapU_U<sceMp3GetMPEGVersion>,            "sceMp3GetMPEGVersion",           'x', "x"    },
	{0X3548AEC8, &WrapU_U<sceMp3GetFrameNum>,               "sceMp3GetFrameNum",              'x', "x"    },
	{0X0840E808, &WrapU_UI<sceMp3ResetPlayPositionByFrame>, "sceMp3ResetPlayPositionByFrame", 'x', "xi"   },
	{0X1B839B83, &WrapU_UU<sceMp3LowLevelInit>,             "sceMp3LowLevelInit",             'x', "xx"   },
	{0XE3EE2C81, &WrapU_UUUUU<sceMp3LowLevelDecode>,        "sceMp3LowLevelDecode",           'x', "xxxxx"}
};

void Register_sceMp3() {
	RegisterModule("sceMp3", ARRAY_SIZE(sceMp3), sceMp3);
}