Aegisub/src/audio_provider_ram.cpp

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// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
// 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 Project http://www.aegisub.org/
/// @file audio_provider_ram.cpp
/// @brief Caching audio provider using heap memory for backing
/// @ingroup audio_input
///
#include "config.h"
#include "audio_provider_ram.h"
#include "audio_controller.h"
#include "compat.h"
#include "options.h"
#include "utils.h"
#include <libaegisub/background_runner.h>
#define CacheBits 22
#define CacheBlockSize (1 << CacheBits)
RAMAudioProvider::RAMAudioProvider(std::unique_ptr<AudioProvider> src, agi::BackgroundRunner *br)
: AudioProviderWrapper(std::move(src))
{
try {
blockcache.resize((source->GetNumSamples() * source->GetBytesPerSample() + CacheBlockSize - 1) >> CacheBits);
}
catch (std::bad_alloc const&) {
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throw agi::AudioCacheOpenError("Couldn't open audio, not enough ram available.", nullptr);
}
br->Run(std::bind(&RAMAudioProvider::FillCache, this, source.get(), std::placeholders::_1));
}
void RAMAudioProvider::FillCache(AudioProvider *source, agi::ProgressSink *ps) {
ps->SetMessage(from_wx(_("Reading into RAM")));
int64_t readsize = CacheBlockSize / source->GetBytesPerSample();
for (size_t i = 0; i < blockcache.size(); i++) {
ps->SetProgress(i + 1, blockcache.size());
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source->GetAudio(&blockcache[i][0], i * readsize, std::min<int64_t>(readsize, num_samples - i * readsize));
if (ps->IsCancelled()) {
return;
}
}
}
void RAMAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const {
char *charbuf = static_cast<char *>(buf);
int i = (start * bytes_per_sample) >> CacheBits;
int start_offset = (start * bytes_per_sample) & (CacheBlockSize-1);
int64_t bytesremaining = count * bytes_per_sample;
while (bytesremaining) {
int readsize = std::min<int>(bytesremaining, CacheBlockSize - start_offset);
memcpy(charbuf, &blockcache[i++][start_offset], readsize);
charbuf += readsize;
start_offset = 0;
bytesremaining -= readsize;
}
}