text: /*
  SoLoud audio engine
  Copyright (c) 2013-2018 Jari Komppa
  
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.
  
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
  
     1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  
     2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  
     3. This notice may not be removed or altered from any source
     distribution.
  */
  
  #include <string.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include "soloud.h"
  #include "dr_flac.h"
  #include "dr_mp3.h"
  #include "dr_wav.h"
  #include "soloud_wavstream.h"
  #include "soloud_file.h"
  #include "stb_vorbis.h"
  
  namespace SoLoud
  {
  	size_t drflac_read_func(void* pUserData, void* pBufferOut, size_t bytesToRead)
  	{
  		File *fp = (File*)pUserData;
  		return fp->read((unsigned char*)pBufferOut, (unsigned int)bytesToRead);
  	}
  
  	size_t drmp3_read_func(void* pUserData, void* pBufferOut, size_t bytesToRead)
  	{
  		File *fp = (File*)pUserData;
  		return fp->read((unsigned char*)pBufferOut, (unsigned int)bytesToRead);
  	}
  
  	size_t drwav_read_func(void* pUserData, void* pBufferOut, size_t bytesToRead)
  	{
  		File *fp = (File*)pUserData;
  		return fp->read((unsigned char*)pBufferOut, (unsigned int)bytesToRead);
  	}
  
  	drflac_bool32 drflac_seek_func(void* pUserData, int offset, drflac_seek_origin origin)
  	{
  		File *fp = (File*)pUserData;
  		if (origin != drflac_seek_origin_start)
  			offset += fp->pos();
  		fp->seek(offset);
  		return 1;
  	}
  
  	drmp3_bool32 drmp3_seek_func(void* pUserData, int offset, drmp3_seek_origin origin)
  	{
  		File *fp = (File*)pUserData;
  		if (origin != drmp3_seek_origin_start)
  			offset += fp->pos();
  		fp->seek(offset);
  		return 1;
  	}
  
  	drmp3_bool32 drwav_seek_func(void* pUserData, int offset, drwav_seek_origin origin)
  	{
  		File *fp = (File*)pUserData;
  		if (origin != drwav_seek_origin_start)
  			offset += fp->pos();
  		fp->seek(offset);
  		return 1;
  	}
  
  	WavStreamInstance::WavStreamInstance(WavStream *aParent)
  	{
  		mParent = aParent;
  		mOffset = 0;
  		mCodec.mOgg = 0;
  		mCodec.mFlac = 0;
  		mFile = 0;
  		if (aParent->mMemFile)
  		{
  			MemoryFile *mf = new MemoryFile();
  			mFile = mf;
  			mf->openMem(aParent->mMemFile->getMemPtr(), aParent->mMemFile->length(), false, false);
  		}
  		else
  		if (aParent->mFilename)
  		{
  			DiskFile *df = new DiskFile;
  			mFile = df;
  			df->open(aParent->mFilename);
  		}
  		else
  		if (aParent->mStreamFile)
  		{
  			mFile = aParent->mStreamFile;
  			mFile->seek(0); // stb_vorbis assumes file offset to be at start of ogg
  		}
  		else
  		{
  			return;
  		}
  		
  		if (mFile)
  		{
  			if (mParent->mFiletype == WAVSTREAM_WAV)
  			{
  				mCodec.mWav = new drwav;
  				if (!drwav_init(mCodec.mWav, drwav_read_func, drwav_seek_func, (void*)mFile, NULL))
  				{
  					delete mCodec.mWav;
  					mCodec.mWav = 0;
  					if (mFile != mParent->mStreamFile)
  						delete mFile;
  					mFile = 0;
  				}
  			}
  			else
  			if (mParent->mFiletype == WAVSTREAM_OGG)
  			{
  				int e;
  
  				mCodec.mOgg = stb_vorbis_open_file((Soloud_Filehack *)mFile, 0, &e, 0);
  
  				if (!mCodec.mOgg)
  				{
  					if (mFile != mParent->mStreamFile)
  						delete mFile;
  					mFile = 0;
  				}
  				mOggFrameSize = 0;
  				mOggFrameOffset = 0;
  				mOggOutputs = 0;
  			}
  			else
  			if (mParent->mFiletype == WAVSTREAM_FLAC)
  			{
  				mCodec.mFlac = drflac_open(drflac_read_func, drflac_seek_func, (void*)mFile, NULL);
  				if (!mCodec.mFlac)
  				{
  					if (mFile != mParent->mStreamFile)
  						delete mFile;
  					mFile = 0;
  				}
  			}
  			else
  			if (mParent->mFiletype == WAVSTREAM_MP3)
  			{
  				mCodec.mMp3 = new drmp3;
  				if (!drmp3_init(mCodec.mMp3, drmp3_read_func, drmp3_seek_func, (void*)mFile, NULL, NULL))
  				{
  					delete mCodec.mMp3;
  					mCodec.mMp3 = 0;
  					if (mFile != mParent->mStreamFile)
  						delete mFile;
  					mFile = 0;
  				}
  			}
  			else
  			{
  				if (mFile != mParent->mStreamFile)
  					delete mFile;
  				mFile = NULL;
  				return;
  			}
  		}
  	}
  
  	WavStreamInstance::~WavStreamInstance()
  	{
  		switch (mParent->mFiletype)
  		{
  		case WAVSTREAM_OGG:
  			if (mCodec.mOgg)
  			{
  				stb_vorbis_close(mCodec.mOgg);
  			}
  			break;
  		case WAVSTREAM_FLAC:
  			if (mCodec.mFlac)
  			{
  				drflac_close(mCodec.mFlac);
  			}
  			break;
  		case WAVSTREAM_MP3:
  			if (mCodec.mMp3)
  			{
  				drmp3_uninit(mCodec.mMp3);
  				delete mCodec.mMp3;
  				mCodec.mMp3 = 0;
  			}
  			break;
  		case WAVSTREAM_WAV:
  			if (mCodec.mWav)
  			{
  				drwav_uninit(mCodec.mWav);
  				delete mCodec.mWav;
  				mCodec.mWav = 0;
  			}
  			break;
  		}
  		if (mFile != mParent->mStreamFile)
  		{
  			delete mFile;
  		}
  	}
  
  	static int getOggData(float **aOggOutputs, float *aBuffer, int aSamples, int aPitch, int aFrameSize, int aFrameOffset, int aChannels)
  	{			
  		if (aFrameSize <= 0)
  			return 0;
  
  		int samples = aSamples;
  		if (aFrameSize - aFrameOffset < samples)
  		{
  			samples = aFrameSize - aFrameOffset;
  		}
  
  		int i;
  		for (i = 0; i < aChannels; i++)
  		{
  			memcpy(aBuffer + aPitch * i, aOggOutputs[i] + aFrameOffset, sizeof(float) * samples);
  		}
  		return samples;
  	}
  
  	
  
  	unsigned int WavStreamInstance::getAudio(float *aBuffer, unsigned int aSamplesToRead, unsigned int aBufferSize)
  	{			
  		unsigned int offset = 0;
  		if (mFile == NULL)
  			return 0;
  		switch (mParent->mFiletype)
  		{
  		case WAVSTREAM_FLAC:
  			{
  				unsigned int i, j, k;
  
  				for (i = 0; i < aSamplesToRead; i += 512)
  				{
  					float tmp[512 * MAX_CHANNELS];
  					unsigned int blockSize = (aSamplesToRead - i) > 512 ? 512 : aSamplesToRead - i;
  					offset += (unsigned int)drflac_read_pcm_frames_f32(mCodec.mFlac, blockSize, tmp);
  
  					for (j = 0; j < blockSize; j++)
  					{
  						for (k = 0; k < mChannels; k++)
  						{
  							aBuffer[k * aSamplesToRead + i + j] = tmp[j * mCodec.mFlac->channels + k];
  						}
  					}
  				}
  				mOffset += offset;
  				return offset;
  			}
  			break;
  		case WAVSTREAM_MP3:
  			{
  				unsigned int i, j, k;
  
  				for (i = 0; i < aSamplesToRead; i += 512)
  				{
  					float tmp[512 * MAX_CHANNELS];
  					unsigned int blockSize = (aSamplesToRead - i) > 512 ? 512 : aSamplesToRead - i;
  					offset += (unsigned int)drmp3_read_pcm_frames_f32(mCodec.mMp3, blockSize, tmp);
  
  					for (j = 0; j < blockSize; j++)
  					{
  						for (k = 0; k < mChannels; k++)
  						{
  							aBuffer[k * aSamplesToRead + i + j] = tmp[j * mCodec.mMp3->channels + k];
  						}
  					}
  				}
  				mOffset += offset;
  				return offset;
  			}
  		break;
  		case WAVSTREAM_OGG:
  			{
  				if (mOggFrameOffset < mOggFrameSize)
  				{
  					int b = getOggData(mOggOutputs, aBuffer, aSamplesToRead, aBufferSize, mOggFrameSize, mOggFrameOffset, mChannels);
  					mOffset += b;
  					offset += b;
  					mOggFrameOffset += b;
  				}
  
  				while (offset < aSamplesToRead)
  				{
  					mOggFrameSize = stb_vorbis_get_frame_float(mCodec.mOgg, NULL, &mOggOutputs);
  					mOggFrameOffset = 0;
  					int b = getOggData(mOggOutputs, aBuffer + offset, aSamplesToRead - offset, aBufferSize, mOggFrameSize, mOggFrameOffset, mChannels);
  					mOffset += b;
  					offset += b;
  					mOggFrameOffset += b;
  
  					if (mOffset >= mParent->mSampleCount || b == 0)
  					{
  						mOffset += offset;
  						return offset;
  					}
  				}
  			}
  			break;
  		case WAVSTREAM_WAV:
  			{
  				unsigned int i, j, k;
  
  				for (i = 0; i < aSamplesToRead; i += 512)
  				{
  					float tmp[512 * MAX_CHANNELS];
  					unsigned int blockSize = (aSamplesToRead - i) > 512 ? 512 : aSamplesToRead - i;
  					offset += (unsigned int)drwav_read_pcm_frames_f32(mCodec.mWav, blockSize, tmp);
  
  					for (j = 0; j < blockSize; j++)
  					{
  						for (k = 0; k < mChannels; k++)
  						{
  							aBuffer[k * aSamplesToRead + i + j] = tmp[j * mCodec.mWav->channels + k];
  						}
  					}
  				}
  				mOffset += offset;
  				return offset;
  			}
  			break;
  		}
  		return aSamplesToRead;
  	}
  
  	result WavStreamInstance::rewind()
  	{
  		switch (mParent->mFiletype)
  		{
  		case WAVSTREAM_OGG:
  			if (mCodec.mOgg)
  			{
  				stb_vorbis_seek_start(mCodec.mOgg);
  			}
  			break;
  		case WAVSTREAM_FLAC:
  			if (mCodec.mFlac)
  			{
  				drflac_seek_to_pcm_frame(mCodec.mFlac, 0);
  			}
  			break;
  		case WAVSTREAM_MP3:
  			if (mCodec.mMp3)
  			{
  				drmp3_seek_to_pcm_frame(mCodec.mMp3, 0);
  			}
  			break;
  		case WAVSTREAM_WAV:
  			if (mCodec.mWav)
  			{
  				drwav_seek_to_pcm_frame(mCodec.mWav, 0);
  			}
  			break;
  		}
  		mOffset = 0;
  		mStreamPosition = 0.0f;
  		return 0;
  	}
  
  	bool WavStreamInstance::hasEnded()
  	{
  		if (mOffset >= mParent->mSampleCount)
  		{
  			return 1;
  		}
  		return 0;
  	}
  
  	WavStream::WavStream()
  	{
  		mFilename = 0;
  		mSampleCount = 0;
  		mFiletype = WAVSTREAM_WAV;
  		mMemFile = 0;
  		mStreamFile = 0;
  	}
  	
  	WavStream::~WavStream()
  	{
  		stop();
  		delete[] mFilename;
  		delete mMemFile;
  	}
  	
  #define MAKEDWORD(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
  
  	result WavStream::loadwav(File * fp)
  	{
  		fp->seek(0);
  		drwav decoder;
  
  		if (!drwav_init(&decoder, drwav_read_func, drwav_seek_func, (void*)fp, NULL))
  			return FILE_LOAD_FAILED;
  
  		mChannels = decoder.channels;
  		if (mChannels > MAX_CHANNELS)
  		{
  			mChannels = MAX_CHANNELS;
  		}
  
  		mBaseSamplerate = (float)decoder.sampleRate;
  		mSampleCount = (unsigned int)decoder.totalPCMFrameCount;
  		mFiletype = WAVSTREAM_WAV;
  		drwav_uninit(&decoder);
  
  		return SO_NO_ERROR;
  	}
  
  	result WavStream::loadogg(File * fp)
  	{
  		fp->seek(0);
  		int e;
  		stb_vorbis *v;
  		v = stb_vorbis_open_file((Soloud_Filehack *)fp, 0, &e, 0);
  		if (v == NULL)
  			return FILE_LOAD_FAILED;
  		stb_vorbis_info info = stb_vorbis_get_info(v);
  		mChannels = info.channels;
  		if (info.channels > MAX_CHANNELS)
  		{
  			mChannels = MAX_CHANNELS;
  		}
  		mBaseSamplerate = (float)info.sample_rate;
  		int samples = stb_vorbis_stream_length_in_samples(v);
  		stb_vorbis_close(v);
  		mFiletype = WAVSTREAM_OGG;
  
  		mSampleCount = samples;
  
  		return 0;
  	}
  
  	result WavStream::loadflac(File * fp)
  	{
  		fp->seek(0);
  		drflac* decoder = drflac_open(drflac_read_func, drflac_seek_func, (void*)fp, NULL);
  
  		if (decoder == NULL)
  			return FILE_LOAD_FAILED;
  		
  		mChannels = decoder->channels;
  		if (mChannels > MAX_CHANNELS)
  		{
  			mChannels = MAX_CHANNELS;
  		}
  
  		mBaseSamplerate = (float)decoder->sampleRate;
  		mSampleCount = (unsigned int)decoder->totalPCMFrameCount;
  		mFiletype = WAVSTREAM_FLAC;
  		drflac_close(decoder);
  
  		return SO_NO_ERROR;
  	}
  
  	result WavStream::loadmp3(File * fp)
  	{
  		fp->seek(0);
  		drmp3 decoder;
  		if (!drmp3_init(&decoder, drmp3_read_func, drmp3_seek_func, (void*)fp, NULL, NULL))
  			return FILE_LOAD_FAILED;
  
  
  		mChannels = decoder.channels;
  		if (mChannels > MAX_CHANNELS)
  		{
  			mChannels = MAX_CHANNELS;
  		}
  
  		drmp3_uint64 samples = drmp3_get_pcm_frame_count(&decoder);
  
  		mBaseSamplerate = (float)decoder.sampleRate;
  		mSampleCount = (unsigned int)samples;
  		mFiletype = WAVSTREAM_MP3;
  		drmp3_uninit(&decoder);
  
  		return SO_NO_ERROR;
  	}
  
  	result WavStream::load(const char *aFilename)
  	{
  		delete[] mFilename;
  		delete mMemFile;
  		mMemFile = 0;
  		mFilename = 0;
  		mSampleCount = 0;
  		DiskFile fp;
  		int res = fp.open(aFilename);
  		if (res != SO_NO_ERROR)
  			return res;
  		
  		int len = (int)strlen(aFilename);
  		mFilename = new char[len+1];		
  		memcpy(mFilename, aFilename, len);
  		mFilename[len] = 0;
  		
  		res = parse(&fp);
  
  		if (res != SO_NO_ERROR)
  		{
  			delete[] mFilename;
  			mFilename = 0;
  			return res;
  		}
  
  		return 0;
  	}
  
  	result WavStream::loadMem(const unsigned char *aData, unsigned int aDataLen, bool aCopy, bool aTakeOwnership)
  	{
  		delete[] mFilename;
  		delete mMemFile;
  		mStreamFile = 0;
  		mMemFile = 0;
  		mFilename = 0;
  		mSampleCount = 0;
  
  		if (aData == NULL || aDataLen == 0)
  			return INVALID_PARAMETER;
  
  		MemoryFile *mf = new MemoryFile();
  		int res = mf->openMem(aData, aDataLen, aCopy, aTakeOwnership);
  		if (res != SO_NO_ERROR)
  		{
  			delete mf;
  			return res;
  		}
  
  		res = parse(mf);
  
  		if (res != SO_NO_ERROR)
  		{
  			delete mf;
  			return res;
  		}
  
  		mMemFile = mf;
  
  		return 0;
  	}
  
  	result WavStream::loadToMem(const char *aFilename)
  	{
  		DiskFile df;
  		int res = df.open(aFilename);
  		if (res == SO_NO_ERROR)
  		{
  			res = loadFileToMem(&df);
  		}
  		return res;
  	}
  
  	result WavStream::loadFile(File *aFile)
  	{
  		delete[] mFilename;
  		delete mMemFile;
  		mStreamFile = 0;
  		mMemFile = 0;
  		mFilename = 0;
  		mSampleCount = 0;
  
  		int res = parse(aFile);
  
  		if (res != SO_NO_ERROR)
  		{
  			return res;
  		}
  
  		mStreamFile = aFile;
  
  		return 0;
  	}
  
  	result WavStream::loadFileToMem(File *aFile)
  	{
  		delete[] mFilename;
  		delete mMemFile;
  		mStreamFile = 0;
  		mMemFile = 0;
  		mFilename = 0;
  		mSampleCount = 0;
  
  		MemoryFile *mf = new MemoryFile();
  		int res = mf->openFileToMem(aFile);
  		if (res != SO_NO_ERROR)
  		{
  			delete mf;
  			return res;
  		}
  
  		res = parse(mf);
  
  		if (res != SO_NO_ERROR)
  		{
  			delete mf;
  			return res;
  		}
  
  		mMemFile = mf;
  
  		return res;
  	}
  
  
  	result WavStream::parse(File *aFile)
  	{
  		int tag = aFile->read32();
  		int res = SO_NO_ERROR;
  		if (tag == MAKEDWORD('O', 'g', 'g', 'S'))
  		{
  			res = loadogg(aFile);
  		}
  		else
  		if (tag == MAKEDWORD('R', 'I', 'F', 'F'))
  		{
  			res = loadwav(aFile);
  		}
  		else
  		if (tag == MAKEDWORD('f', 'L', 'a', 'C'))
  		{
  			res = loadflac(aFile);
  		}
  		else
  		if (loadmp3(aFile) == SO_NO_ERROR)
  		{
  			res = SO_NO_ERROR;
  		}
  		else
  		{
  			res = FILE_LOAD_FAILED;
  		}
  		return res;
  	}
  
  	AudioSourceInstance *WavStream::createInstance()
  	{
  		return new WavStreamInstance(this);
  	}
  
  	double WavStream::getLength()
  	{
  		if (mBaseSamplerate == 0)
  			return 0;
  		return mSampleCount / mBaseSamplerate;
  	}
  };
  