Initial community commit

Src/Winamp/ResamplingReader.cpp

@@ -0,0 +1,89 @@
+/** (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 "ResamplingReader.h"
+
+ResamplingReader::ResamplingReader(Resampler *_resampler, CommonReader *_reader, size_t inputFrameSize)
+		: resampler(_resampler), reader(_reader),
+		bufferValid(0),
+		readState(READING)
+{
+	bufferAlloc = inputFrameSize * 1024; // enough room for 1024 samples
+	buffer = (__int8 *)calloc(bufferAlloc, sizeof(__int8));
+}
+
+ResamplingReader::~ResamplingReader()
+{
+	free(buffer);
+	delete resampler;
+	delete reader;
+}
+
+size_t ResamplingReader::ReadAudio(void *outputBuffer, size_t sizeBytes)
+{
+	size_t origSize = sizeBytes;
+	__int8 *origBuffer = (__int8 *)outputBuffer;
+	size_t bytesResampled = 0;
+read_again:
+	// First, read from the file decoder
+	switch (readState)
+	{
+	case READING:
+		{
+			size_t bytesToRead = bufferAlloc - bufferValid;
+			if (bytesToRead)
+			{
+				int decode_killswitch=0, decode_error;
+				size_t bytesRead = reader->ReadAudio(buffer + (bufferAlloc - bytesToRead), bytesToRead, &decode_killswitch, &decode_error);
+				bufferValid += bytesRead;
+				if (bytesRead == 0)
+				{
+					readState = ENDOFFILE;
+				}
+			}
+		}
+		break;
+	case ENDOFFILE:
+		resampler->Flush();
+		readState = FLUSHING;
+
+	}
+
+	// now, resample
+	size_t inputBytes = bufferValid;
+	size_t bytesDone;
+
+	bytesDone = resampler->Convert(buffer, &inputBytes, outputBuffer, sizeBytes);
+	bytesResampled += bytesDone;
+
+	// if we didn't use all of our input buffer, then we'll copy what's left to the beginning
+	if (inputBytes)
+		memmove(buffer, buffer + (bufferValid - inputBytes), inputBytes);
+
+	// mark the number of bytes of data still valid in the input buffer
+	bufferValid = inputBytes;
+
+	if (!bytesDone && readState == FLUSHING)
+		readState = DONE;
+
+	if (bytesResampled != origSize && readState != DONE) // if we didn't provide enough data to fill the output buffer
+	{
+		sizeBytes = origSize - bytesResampled;
+		outputBuffer = origBuffer + bytesResampled;
+		goto read_again;
+	}
+
+
+
+	return bytesResampled;
+
+}
+#define CBCLASS ResamplingReader
+START_DISPATCH;
+CB(IFC_AUDIOSTREAM_READAUDIO, ReadAudio)
+END_DISPATCH;