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https://github.com/dolphin-emu/dolphin.git
synced 2024-09-21 20:01:40 +02:00
a10a3ecbac
snd_pcm_writei() is meant to block block until all samples are written, but apparently in some situations it can block for much longer, prehaps even a infinite time, in the case of virtual machine FifoCI runs in. Because it grabed a mutex before blocking, it could also block the Clear() call for an infinite length of time, blocking dolphin's emu thread. snd_pcm_writei() also takes 10-15 seconds if you run dolphin under GDB and can randomly take 5 or so seconds during normal usage. By moving all the pause code to the ALSA thread, Clear() no-longer blocks and everyone keeps their sanity.
66 lines
1.2 KiB
C++
66 lines
1.2 KiB
C++
// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#pragma once
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#include <atomic>
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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#if defined(HAVE_ALSA) && HAVE_ALSA
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#include <alsa/asoundlib.h>
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#endif
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#include "AudioCommon/SoundStream.h"
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#include "Common/CommonTypes.h"
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class AlsaSound final : public SoundStream
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{
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#if defined(HAVE_ALSA) && HAVE_ALSA
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public:
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AlsaSound();
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bool Start() override;
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void SoundLoop() override;
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void Stop() override;
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void Update() override;
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void Clear(bool) override;
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static bool isValid()
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{
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return true;
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}
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private:
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// maximum number of frames the buffer can hold
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static constexpr size_t BUFFER_SIZE_MAX = 8192;
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// minimum number of frames to deliver in one transfer
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static constexpr u32 FRAME_COUNT_MIN = 256;
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// number of channels per frame
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static constexpr u32 CHANNEL_COUNT = 2;
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enum class ALSAThreadStatus
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{
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RUNNING,
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PAUSED,
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STOPPING,
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STOPPED,
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};
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bool AlsaInit();
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void AlsaShutdown();
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s16 mix_buffer[BUFFER_SIZE_MAX * CHANNEL_COUNT];
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std::thread thread;
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std::atomic<ALSAThreadStatus> m_thread_status;
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std::condition_variable cv;
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std::mutex cv_m;
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snd_pcm_t *handle;
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unsigned int frames_to_deliver;
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#endif
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};
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