96 lines
3 KiB
C++
96 lines
3 KiB
C++
// Copyright (c) 2014, Thomas Goyne <plorkyeran@aegisub.org>
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//
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// Permission to use, copy, modify, and distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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// Aegisub Project http://www.aegisub.org/
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#include "libaegisub/audio/provider.h"
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#include "libaegisub/make_unique.h"
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#include <array>
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#include <boost/container/stable_vector.hpp>
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#include <thread>
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namespace {
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using namespace agi;
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#define CacheBits 22
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#define CacheBlockSize (1 << CacheBits)
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class RAMAudioProvider final : public AudioProviderWrapper {
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#ifdef _MSC_VER
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boost::container::stable_vector<char[CacheBlockSize]> blockcache;
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#else
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boost::container::stable_vector<std::array<char, CacheBlockSize>> blockcache;
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#endif
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std::atomic<bool> cancelled = {false};
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std::thread decoder;
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void FillBuffer(void *buf, int64_t start, int64_t count) const override;
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public:
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RAMAudioProvider(std::unique_ptr<AudioProvider> src)
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: AudioProviderWrapper(std::move(src))
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{
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decoded_samples = 0;
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try {
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blockcache.resize((source->GetNumSamples() * source->GetBytesPerSample() + CacheBlockSize - 1) >> CacheBits);
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}
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catch (std::bad_alloc const&) {
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throw AudioProviderError("Not enough memory available to cache in RAM");
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}
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decoder = std::thread([&] {
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int64_t readsize = CacheBlockSize / source->GetBytesPerSample();
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for (size_t i = 0; i < blockcache.size(); i++) {
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if (cancelled) break;
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auto actual_read = std::min<int64_t>(readsize, num_samples - i * readsize);
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source->GetAudio(&blockcache[i][0], i * readsize, actual_read);
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decoded_samples += actual_read;
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}
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});
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}
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~RAMAudioProvider() {
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cancelled = true;
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decoder.join();
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}
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};
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void RAMAudioProvider::FillBuffer(void *buf, int64_t start, int64_t count) const {
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auto charbuf = static_cast<char *>(buf);
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for (int64_t bytes_remaining = count * bytes_per_sample; bytes_remaining; ) {
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if (start >= decoded_samples) {
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memset(charbuf, 0, bytes_remaining);
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break;
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}
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const int i = (start * bytes_per_sample) >> CacheBits;
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const int start_offset = (start * bytes_per_sample) & (CacheBlockSize-1);
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const int read_size = std::min<int>(bytes_remaining, CacheBlockSize - start_offset);
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memcpy(charbuf, &blockcache[i][start_offset], read_size);
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charbuf += read_size;
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bytes_remaining -= read_size;
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start += read_size / bytes_per_sample;
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}
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}
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}
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namespace agi {
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std::unique_ptr<AudioProvider> CreateRAMAudioProvider(std::unique_ptr<AudioProvider> src) {
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return make_unique<RAMAudioProvider>(std::move(src));
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}
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}
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