mirror of https://github.com/odrling/Aegisub
92 lines
3.1 KiB
C++
92 lines
3.1 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 "include/aegisub/audio_provider.h"
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#include "audio_controller.h"
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#include "options.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 <thread>
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namespace {
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class HDAudioProvider final : public AudioProviderWrapper {
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std::unique_ptr<agi::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);
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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;
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count *= bytes_per_sample;
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memcpy(buf, file->read(start, count), count);
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}
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}
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public:
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HDAudioProvider(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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auto path = OPT_GET("Audio/Cache/HD/Location")->GetString();
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if (path == "default")
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path = "?temp";
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auto cache_dir = config::path->MakeAbsolute(config::path->Decode(path), "?temp");
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// Check free space
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if ((uint64_t)num_samples * bytes_per_sample > agi::fs::FreeSpace(cache_dir))
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throw agi::AudioCacheOpenError("Not enough free disk space in " + cache_dir.string() + " to cache the audio", nullptr);
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auto filename = agi::format("audio-%lld-%lld", time(nullptr),
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boost::interprocess::ipcdetail::get_current_process_id());
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file = agi::make_unique<agi::temp_file_mapping>(cache_dir / filename, num_samples * bytes_per_sample);
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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, block * bytes_per_sample), 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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std::unique_ptr<AudioProvider> CreateHDAudioProvider(std::unique_ptr<AudioProvider> src) {
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return agi::make_unique<HDAudioProvider>(std::move(src));
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}
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