Aegisub/aegisub/audio_provider_convert.cpp
2008-01-19 02:38:31 +00:00

87 lines
2.8 KiB
C++

// 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.");
}