mirror of https://github.com/odrling/Aegisub
90 lines
3.0 KiB
C++
90 lines
3.0 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/file_mapping.h>
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#include <libaegisub/format.h>
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#include <libaegisub/fs.h>
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#include <libaegisub/path.h>
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#include <libaegisub/make_unique.h>
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#include <boost/filesystem/path.hpp>
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#include <boost/interprocess/detail/os_thread_functions.hpp>
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#include <ctime>
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#include <thread>
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namespace {
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using namespace agi;
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class HDAudioProvider final : public AudioProviderWrapper {
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mutable temp_file_mapping file;
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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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auto missing = std::min(count, start + count - decoded_samples);
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if (missing > 0) {
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memset(static_cast<int16_t*>(buf) + count - missing, 0, missing * bytes_per_sample * channels);
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count -= missing;
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}
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if (count > 0) {
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start *= bytes_per_sample * channels;
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count *= bytes_per_sample * channels;
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memcpy(buf, file.read(start, count), count);
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}
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}
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fs::path CacheFilename(fs::path const& dir) {
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// Check free space
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if ((uint64_t)num_samples * bytes_per_sample * channels > fs::FreeSpace(dir))
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throw AudioProviderError("Not enough free disk space in " + dir.string() + " to cache the audio");
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return format("audio-%lld-%lld", time(nullptr),
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boost::interprocess::ipcdetail::get_current_process_id());
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}
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public:
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HDAudioProvider(std::unique_ptr<AudioProvider> src, agi::fs::path const& dir)
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: AudioProviderWrapper(std::move(src))
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, file(dir / CacheFilename(dir), num_samples * bytes_per_sample * channels)
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{
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decoded_samples = 0;
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decoder = std::thread([&] {
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int64_t block = 65536;
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for (int64_t i = 0; i < num_samples; i += block) {
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if (cancelled) break;
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block = std::min(block, num_samples - i);
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source->GetAudio(file.write(i * bytes_per_sample * channels, block * bytes_per_sample * channels), i, block);
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decoded_samples += block;
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}
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});
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}
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~HDAudioProvider() {
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cancelled = true;
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decoder.join();
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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> CreateHDAudioProvider(std::unique_ptr<AudioProvider> src, agi::fs::path const& dir) {
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return agi::make_unique<HDAudioProvider>(std::move(src), dir);
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}
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}
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