Initial community commit

Src/Winamp/DecodeFile.cpp

@@ -0,0 +1,202 @@
+/** (c) Nullsoft, Inc.         C O N F I D E N T I A L
+ ** Filename: 
+ ** Project:
+ ** Description:
+ ** Author: Ben Allison benski@nullsoft.com
+ ** Created:
+ **/
+#include "main.h"
+#include <stddef.h>
+#include "DecodeFile.h"
+#include "ExtendedReader.h"
+#include "OutputPluginAudioStream.h"
+#include "ResamplingReader.h"
+#include "CommonReader.h"
+
+// "input" means input FROM the decoder, "output" means output TO the person using the ifc_audiostream
+static bool RequiresResampling(const AudioParameters *input, size_t outputChannels, size_t outputBits, size_t outputSampleRate)
+{
+	if (outputChannels != input->channels)
+		return true; // need to up or downmix
+
+	if (outputBits != input->bitsPerSample)
+		return true;
+
+	if (outputSampleRate != input->sampleRate)
+		return true;
+
+	return false;
+}
+
+static void SetResamplingParameters(const AudioParameters *input, size_t &outputChannels, size_t &outputBits, size_t &outputSampleRate)
+{
+	// channels
+		if (!outputChannels) 
+			outputChannels=input->channels;
+		else if ((input->flags & AUDIOPARAMETERS_MAXCHANNELS) && input->channels <= outputChannels)
+			outputChannels = input->channels;
+
+	// bits
+	if (!outputBits) outputBits = input->bitsPerSample;
+		
+	// samplerate
+	if (!outputSampleRate)
+		outputSampleRate = input->sampleRate;
+	else if ((input->flags & AUDIOPARAMETERS_MAXSAMPLERATE) && input->sampleRate <= outputSampleRate)
+		outputSampleRate = input->sampleRate;
+
+}
+
+ifc_audiostream *DecodeFile::OpenAudio(const wchar_t *filename, AudioParameters *parameters)
+{
+	// save some info
+	size_t outputChannels = parameters->channels;
+	size_t outputBits = parameters->bitsPerSample;
+	size_t outputSampleRate = parameters->sampleRate;
+
+	CommonReader *reader = MakeReader(filename, parameters, true);
+	if (!reader)
+		return 0;
+
+	// check if they've requested certain output parameters
+	if (outputChannels || outputBits || outputSampleRate)
+	{
+		SetResamplingParameters(parameters, outputChannels, outputBits, outputSampleRate);
+
+		// check if we need any resampling/conversion
+		if (RequiresResampling(parameters, outputChannels, outputBits, outputSampleRate))
+		{
+			Resampler *resampler = new Resampler(parameters->bitsPerSample, parameters->channels, parameters->sampleRate,
+			                                     outputBits, outputChannels, outputSampleRate, parameters->flags & AUDIOPARAMETERS_FLOAT);
+
+			if (!resampler->OK())
+			{
+				parameters->errorCode = API_DECODEFILE_BAD_RESAMPLE;
+				delete resampler;
+				return 0;
+			}
+
+			parameters->bitsPerSample = (uint32_t)outputBits;
+			parameters->channels = (uint32_t)outputChannels;
+			parameters->sampleRate = (uint32_t)outputSampleRate;
+			parameters->sizeBytes =(size_t)((double)parameters->sizeBytes * resampler->sizeFactor);
+			ResamplingReader *resampleReader = new ResamplingReader(resampler, reader, outputChannels * outputBits / 8);
+
+			return resampleReader;
+		}
+
+	}
+	return reader;
+}
+
+ifc_audiostream *DecodeFile::OpenAudioBackground(const wchar_t *filename, AudioParameters *parameters)
+{
+	// save some info
+	size_t outputChannels = parameters->channels;
+	size_t outputBits = parameters->bitsPerSample;
+	size_t outputSampleRate = parameters->sampleRate;
+
+	CommonReader *reader = MakeReader(filename, parameters, false);
+	if (!reader)
+		return 0;
+
+	// check if they've requested certain output parameters
+	if (outputChannels || outputBits || outputSampleRate)
+	{
+		SetResamplingParameters(parameters, outputChannels, outputBits, outputSampleRate);
+
+		// check if we need any resampling/conversion
+		if (RequiresResampling(parameters, outputChannels, outputBits, outputSampleRate))
+		{
+			Resampler *resampler = new Resampler(parameters->bitsPerSample, parameters->channels, parameters->sampleRate,
+			                                     outputBits, outputChannels, outputSampleRate, parameters->flags & AUDIOPARAMETERS_FLOAT);
+
+			if (!resampler->OK())
+			{
+				parameters->errorCode = API_DECODEFILE_BAD_RESAMPLE;
+				delete resampler;
+				delete reader;
+				return 0;
+			}
+
+			parameters->bitsPerSample = (uint32_t)outputBits;
+			parameters->channels = (uint32_t)outputChannels;
+			parameters->sampleRate = (uint32_t)outputSampleRate;
+
+			ResamplingReader *resampleReader = new ResamplingReader(resampler, reader, outputChannels * outputBits / 8);
+			
+			return resampleReader;
+		}
+
+	}
+	return reader;
+}
+
+CommonReader *DecodeFile::MakeReader(const wchar_t *filename, AudioParameters *parameters, bool useUnagi)
+{
+	In_Module *in;
+	int a = 0;
+	bool found = false;
+
+	while (a >= 0)
+	{
+		OpenFunc open = 0, openFloat=0;
+		OpenWFunc openW=0, openWFloat=0;
+		GetDataFunc getData = 0;
+		CloseFunc close = 0;
+		SetTimeFunc setTime = 0;
+
+		in = in_setmod_noplay(filename, &a);
+		if (!in) break;
+		if (a >= 0) a++;
+
+		found = true;
+
+		open = (OpenFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_open");
+		openFloat = (OpenFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_open_float");
+		openW = (OpenWFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_openW");
+		openWFloat = (OpenWFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_openW_float");
+		getData = (GetDataFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_getData");
+		close = (CloseFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_close");
+		setTime = (SetTimeFunc)GetProcAddress(in->hDllInstance, "winampGetExtendedRead_setTime"); //optional!
+		if ((open || openW) && getData && close)
+		{
+			ExtendedReader *reader = new ExtendedReader(open, openW, openFloat, openWFloat, getData, close, setTime);
+			if (reader->Open(filename, parameters))
+				return reader;
+			else
+				delete reader;
+		}
+
+	}
+
+	if (!found || !useUnagi)
+	{
+		parameters->errorCode = API_DECODEFILE_UNSUPPORTED;
+	}
+	else
+	{
+		OutputPluginAudioStream *reader = new OutputPluginAudioStream;
+		in = in_setmod_noplay(filename, 0);
+		if (reader->Open(in, filename, parameters))
+			return reader;
+		delete reader;
+	}
+
+	return 0;
+}
+
+void DecodeFile::CloseAudio(ifc_audiostream *audioStream)
+{
+	CommonReader *reader = static_cast<CommonReader *>(audioStream);
+	delete reader;
+	//audioStream=0;
+}
+
+
+#define CBCLASS DecodeFile
+START_DISPATCH;
+CB(API_DECODEFILE_OPENAUDIO, OpenAudio)
+CB(API_DECODEFILE_OPENAUDIO2, OpenAudioBackground)
+VCB(API_DECODEFILE_CLOSEAUDIO, CloseAudio)
+END_DISPATCH;