forked from mia/Aegisub
113 lines
4 KiB
C++
113 lines
4 KiB
C++
// 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 "include/aegisub/audio_provider.h"
|
|
|
|
#include "audio_controller.h"
|
|
|
|
#include <libaegisub/make_unique.h>
|
|
|
|
#include <array>
|
|
#include <boost/container/stable_vector.hpp>
|
|
#include <thread>
|
|
|
|
namespace {
|
|
|
|
#define CacheBits 22
|
|
#define CacheBlockSize (1 << CacheBits)
|
|
|
|
class RAMAudioProvider final : public AudioProviderWrapper {
|
|
#ifdef _MSC_VER
|
|
boost::container::stable_vector<char[CacheBlockSize]> blockcache;
|
|
#else
|
|
boost::container::stable_vector<std::array<char, CacheBlockSize>> blockcache;
|
|
#endif
|
|
std::atomic<bool> cancelled = {false};
|
|
std::thread decoder;
|
|
|
|
void FillBuffer(void *buf, int64_t start, int64_t count) const override;
|
|
|
|
public:
|
|
RAMAudioProvider(std::unique_ptr<AudioProvider> src)
|
|
: AudioProviderWrapper(std::move(src))
|
|
{
|
|
decoded_samples = 0;
|
|
|
|
try {
|
|
blockcache.resize((source->GetNumSamples() * source->GetBytesPerSample() + CacheBlockSize - 1) >> CacheBits);
|
|
}
|
|
catch (std::bad_alloc const&) {
|
|
throw agi::AudioCacheOpenError("Couldn't open audio, not enough ram available.");
|
|
}
|
|
|
|
decoder = std::thread([&] {
|
|
int64_t readsize = CacheBlockSize / source->GetBytesPerSample();
|
|
for (size_t i = 0; i < blockcache.size(); i++) {
|
|
if (cancelled) break;
|
|
auto actual_read = std::min<int64_t>(readsize, num_samples - i * readsize);
|
|
source->GetAudio(&blockcache[i][0], i * readsize, actual_read);
|
|
decoded_samples += actual_read;
|
|
}
|
|
});
|
|
}
|
|
|
|
~RAMAudioProvider() {
|
|
cancelled = true;
|
|
decoder.join();
|
|
}
|
|
};
|
|
|
|
void RAMAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const {
|
|
auto charbuf = static_cast<char *>(buf);
|
|
for (int64_t bytes_remaining = count * bytes_per_sample; bytes_remaining; ) {
|
|
if (start >= decoded_samples) {
|
|
memset(charbuf, 0, bytes_remaining);
|
|
break;
|
|
}
|
|
|
|
const int i = (start * bytes_per_sample) >> CacheBits;
|
|
const int start_offset = (start * bytes_per_sample) & (CacheBlockSize-1);
|
|
const int read_size = std::min<int>(bytes_remaining, CacheBlockSize - start_offset);
|
|
|
|
memcpy(charbuf, &blockcache[i][start_offset], read_size);
|
|
charbuf += read_size;
|
|
bytes_remaining -= read_size;
|
|
start += read_size / bytes_per_sample;
|
|
}
|
|
}
|
|
}
|
|
|
|
std::unique_ptr<AudioProvider> CreateRAMAudioProvider(std::unique_ptr<AudioProvider> src) {
|
|
return agi::make_unique<RAMAudioProvider>(std::move(src));
|
|
}
|