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Merge pull request #3110 from booto/alsa-buffer-type

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AlsaSound: fix buffer type, clean up macros
This commit is contained in:
flacs 2015-10-01 00:01:26 +02:00
commit 6305437327
2 changed files with 14 additions and 16 deletions
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18
Source/Core/AudioCommon/AlsaSoundStream.cpp
View File

@ -9,21 +9,11 @@
#include "Common/Thread.h" #include "Common/Thread.h"
#include "Common/Logging/Log.h" #include "Common/Logging/Log.h"
#define FRAME_COUNT_MIN 256
#define BUFFER_SIZE_MAX 8192
#define BUFFER_SIZE_BYTES (BUFFER_SIZE_MAX*2*2)
AlsaSound::AlsaSound() AlsaSound::AlsaSound()
: m_thread_status(ALSAThreadStatus::STOPPED) : m_thread_status(ALSAThreadStatus::STOPPED)
, handle(nullptr) , handle(nullptr)
, frames_to_deliver(FRAME_COUNT_MIN) , frames_to_deliver(FRAME_COUNT_MIN)
{ {
mix_buffer = new u8[BUFFER_SIZE_BYTES];
}
AlsaSound::~AlsaSound()
{
delete [] mix_buffer;
} }
bool AlsaSound::Start() bool AlsaSound::Start()
@ -63,7 +53,7 @@ void AlsaSound::SoundLoop()
std::unique_lock<std::mutex> lock(cv_m); std::unique_lock<std::mutex> lock(cv_m);
cv.wait(lock, [this]{return !m_muted || m_thread_status.load() != ALSAThreadStatus::RUNNING;}); cv.wait(lock, [this]{return !m_muted || m_thread_status.load() != ALSAThreadStatus::RUNNING;});
m_mixer->Mix(reinterpret_cast<short *>(mix_buffer), frames_to_deliver); m_mixer->Mix(mix_buffer, frames_to_deliver);
int rc = snd_pcm_writei(handle, mix_buffer, frames_to_deliver); int rc = snd_pcm_writei(handle, mix_buffer, frames_to_deliver);
if (rc == -EPIPE) if (rc == -EPIPE)
{ {
@ -145,7 +135,7 @@ bool AlsaSound::AlsaInit()
return false; return false;
} }
err = snd_pcm_hw_params_set_channels(handle, hwparams, 2); err = snd_pcm_hw_params_set_channels(handle, hwparams, CHANNEL_COUNT);
if (err < 0) if (err < 0)
{ {
ERROR_LOG(AUDIO, "Channels count not available: %s\n", snd_strerror(err)); ERROR_LOG(AUDIO, "Channels count not available: %s\n", snd_strerror(err));
@ -156,7 +146,7 @@ bool AlsaSound::AlsaInit()
err = snd_pcm_hw_params_set_periods_max(handle, hwparams, &periods, &dir); err = snd_pcm_hw_params_set_periods_max(handle, hwparams, &periods, &dir);
if (err < 0) if (err < 0)
{ {
ERROR_LOG(AUDIO, "Cannot set Minimum periods: %s\n", snd_strerror(err)); ERROR_LOG(AUDIO, "Cannot set maximum periods per buffer: %s\n", snd_strerror(err));
return false; return false;
} }
@ -164,7 +154,7 @@ bool AlsaSound::AlsaInit()
err = snd_pcm_hw_params_set_buffer_size_max(handle, hwparams, &buffer_size_max); err = snd_pcm_hw_params_set_buffer_size_max(handle, hwparams, &buffer_size_max);
if (err < 0) if (err < 0)
{ {
ERROR_LOG(AUDIO, "Cannot set minimum buffer size: %s\n", snd_strerror(err)); ERROR_LOG(AUDIO, "Cannot set maximum buffer size: %s\n", snd_strerror(err));
return false; return false;
} }

12
Source/Core/AudioCommon/AlsaSoundStream.h
View File

@ -21,7 +21,6 @@ class AlsaSound final : public SoundStream
#if defined(HAVE_ALSA) && HAVE_ALSA #if defined(HAVE_ALSA) && HAVE_ALSA
public: public:
AlsaSound(); AlsaSound();
virtual ~AlsaSound();
bool Start() override; bool Start() override;
void SoundLoop() override; void SoundLoop() override;
@ -35,6 +34,15 @@ public:
} }
private: 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 enum class ALSAThreadStatus
{ {
RUNNING, RUNNING,
@ -45,7 +53,7 @@ private:
bool AlsaInit(); bool AlsaInit();
void AlsaShutdown(); void AlsaShutdown();
u8 *mix_buffer; s16 mix_buffer[BUFFER_SIZE_MAX * CHANNEL_COUNT];
std::thread thread; std::thread thread;
std::atomic<ALSAThreadStatus> m_thread_status; std::atomic<ALSAThreadStatus> m_thread_status;
std::condition_variable cv; std::condition_variable cv;