Aegisub/aegisub/audio_provider_convert.cpp

// Copyright (c) 2008, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of the Aegisub Group nor the names of its contributors
//     may be used to endorse or promote products derived from this software
//     without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//


#pragma once


///////////
// Headers
#include "audio_provider_convert.h"


///////////////
// Constructor
ConvertAudioProvider::ConvertAudioProvider(AudioProvider *src) {
	source = src;
	channels = 1;
	num_samples = source->GetNumSamples();
	sample_rate = source->GetSampleRate();
	bytes_per_sample = 2;
}


//////////////
// Destructor
ConvertAudioProvider::~ConvertAudioProvider() {
	delete source;
}


/////////////
// Get audio
void ConvertAudioProvider::GetAudio(void *destination, int64_t start, int64_t count) {
	// Bits per sample
	int srcBps = source->GetBytesPerSample();

	// Convert from 8-bit to 16-bit
	if (srcBps == 1) {
		unsigned char *buffer = new unsigned char[count];
		source->GetAudio(buffer,start,count);
		short temp;
		short *dst = (short*) destination;
		for (int64_t i=0;i<count;i++) {
			temp = (short) buffer[i];
			dst[i] = (temp-128)*256+temp;
		}
		delete [] buffer;
	}

	// No conversion needed
	else if (srcBps == 2) source->GetAudio(destination,start,count);

	// Unsupported
	else throw _T("Unknown bits per sample value.");
}