mirror of
https://github.com/dolphin-emu/dolphin.git
synced 2024-11-15 22:09:19 -07:00
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.
67 lines
1.2 KiB
C++
67 lines
1.2 KiB
C++
// Copyright 2008 Dolphin Emulator Project
|
|
// Licensed under GPLv2+
|
|
// Refer to the license.txt file included.
|
|
|
|
#pragma once
|
|
|
|
#include <atomic>
|
|
#include <condition_variable>
|
|
#include <mutex>
|
|
#include <thread>
|
|
|
|
#if defined(HAVE_ALSA) && HAVE_ALSA
|
|
#include <alsa/asoundlib.h>
|
|
#endif
|
|
|
|
#include "AudioCommon/SoundStream.h"
|
|
#include "Common/CommonTypes.h"
|
|
|
|
class AlsaSound final : public SoundStream
|
|
{
|
|
#if defined(HAVE_ALSA) && HAVE_ALSA
|
|
public:
|
|
AlsaSound();
|
|
|
|
bool Start() override;
|
|
void SoundLoop() override;
|
|
void Stop() override;
|
|
void Update() override;
|
|
void Clear(bool) override;
|
|
|
|
static bool isValid()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
// maximum number of frames the buffer can hold
|
|
static constexpr size_t BUFFER_SIZE_MAX = 8192;
|
|
|
|
// minimum number of frames to deliver in one transfer
|
|
static constexpr u32 FRAME_COUNT_MIN = 256;
|
|
|
|
// number of channels per frame
|
|
static constexpr u32 CHANNEL_COUNT = 2;
|
|
|
|
enum class ALSAThreadStatus
|
|
{
|
|
RUNNING,
|
|
PAUSED,
|
|
STOPPING,
|
|
STOPPED,
|
|
};
|
|
|
|
bool AlsaInit();
|
|
void AlsaShutdown();
|
|
|
|
s16 mix_buffer[BUFFER_SIZE_MAX * CHANNEL_COUNT];
|
|
std::thread thread;
|
|
std::atomic<ALSAThreadStatus> m_thread_status;
|
|
std::condition_variable cv;
|
|
std::mutex cv_m;
|
|
|
|
snd_pcm_t *handle;
|
|
unsigned int frames_to_deliver;
|
|
#endif
|
|
};
|