90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
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/** (c) Nullsoft, Inc. C O N F I D E N T I A L
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** Filename:
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** Project:
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** Description:
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** Author: Ben Allison benski@nullsoft.com
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** Created:
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**/
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#include "main.h"
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#include "ResamplingReader.h"
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ResamplingReader::ResamplingReader(Resampler *_resampler, CommonReader *_reader, size_t inputFrameSize)
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: resampler(_resampler), reader(_reader),
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bufferValid(0),
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readState(READING)
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{
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bufferAlloc = inputFrameSize * 1024; // enough room for 1024 samples
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buffer = (__int8 *)calloc(bufferAlloc, sizeof(__int8));
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}
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ResamplingReader::~ResamplingReader()
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{
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free(buffer);
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delete resampler;
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delete reader;
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}
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size_t ResamplingReader::ReadAudio(void *outputBuffer, size_t sizeBytes)
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{
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size_t origSize = sizeBytes;
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__int8 *origBuffer = (__int8 *)outputBuffer;
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size_t bytesResampled = 0;
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read_again:
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// First, read from the file decoder
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switch (readState)
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{
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case READING:
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{
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size_t bytesToRead = bufferAlloc - bufferValid;
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if (bytesToRead)
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{
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int decode_killswitch=0, decode_error;
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size_t bytesRead = reader->ReadAudio(buffer + (bufferAlloc - bytesToRead), bytesToRead, &decode_killswitch, &decode_error);
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bufferValid += bytesRead;
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if (bytesRead == 0)
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{
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readState = ENDOFFILE;
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}
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}
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}
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break;
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case ENDOFFILE:
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resampler->Flush();
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readState = FLUSHING;
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}
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// now, resample
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size_t inputBytes = bufferValid;
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size_t bytesDone;
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bytesDone = resampler->Convert(buffer, &inputBytes, outputBuffer, sizeBytes);
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bytesResampled += bytesDone;
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// if we didn't use all of our input buffer, then we'll copy what's left to the beginning
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if (inputBytes)
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memmove(buffer, buffer + (bufferValid - inputBytes), inputBytes);
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// mark the number of bytes of data still valid in the input buffer
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bufferValid = inputBytes;
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if (!bytesDone && readState == FLUSHING)
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readState = DONE;
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if (bytesResampled != origSize && readState != DONE) // if we didn't provide enough data to fill the output buffer
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{
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sizeBytes = origSize - bytesResampled;
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outputBuffer = origBuffer + bytesResampled;
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goto read_again;
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}
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return bytesResampled;
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}
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#define CBCLASS ResamplingReader
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START_DISPATCH;
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CB(IFC_AUDIOSTREAM_READAUDIO, ReadAudio)
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END_DISPATCH;
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