audio: Interpolate system manager sample count using host sink sample info

This avoids the need to stall if the host sink sporadically misses the deadline, in such a case the previous implementation would report them samples as being played on-time, causing the guest to send more samples and leading to a gradual buildup.
This commit is contained in:
Billy Laws 2023-03-18 20:52:02 +00:00
parent 8da1a4ea22
commit d8fc3f403b
4 changed files with 39 additions and 3 deletions

View file

@ -121,8 +121,7 @@ u64 DeviceSession::GetPlayedSampleCount() const {
}
std::optional<std::chrono::nanoseconds> DeviceSession::ThreadFunc() {
// Add 5ms of samples at a 48K sample rate.
played_sample_count += 48'000 * INCREMENT_TIME / 1s;
played_sample_count = stream->GetExpectedPlayedSampleCount();
if (type == Sink::StreamType::Out) {
system.AudioCore().GetAudioManager().SetEvent(Event::Type::AudioOutManager, true);
} else {

View file

@ -15,7 +15,6 @@ MICROPROFILE_DEFINE(Audio_RenderSystemManager, "Audio", "Render System Manager",
MP_RGB(60, 19, 97));
namespace AudioCore::AudioRenderer {
constexpr std::chrono::nanoseconds RENDER_TIME{5'000'000UL};
SystemManager::SystemManager(Core::System& core_)
: core{core_}, adsp{core.AudioCore().GetADSP()}, mailbox{adsp.GetRenderMailbox()},

View file

@ -14,6 +14,8 @@
#include "common/fixed_point.h"
#include "common/settings.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/core_timing_util.h"
namespace AudioCore::Sink {
@ -198,6 +200,7 @@ void SinkStream::ProcessAudioOutAndRender(std::span<s16> output_buffer, std::siz
const std::size_t frame_size = num_channels;
const std::size_t frame_size_bytes = frame_size * sizeof(s16);
size_t frames_written{0};
size_t actual_frames_written{0};
// If we're paused or going to shut down, we don't want to consume buffers as coretiming is
// paused and we'll desync, so just play silence.
@ -248,6 +251,7 @@ void SinkStream::ProcessAudioOutAndRender(std::span<s16> output_buffer, std::siz
frames_available * frame_size);
frames_written += frames_available;
actual_frames_written += frames_available;
playing_buffer.frames_played += frames_available;
// If that's all the frames in the current buffer, add its samples and mark it as
@ -260,6 +264,13 @@ void SinkStream::ProcessAudioOutAndRender(std::span<s16> output_buffer, std::siz
std::memcpy(&last_frame[0], &output_buffer[(frames_written - 1) * frame_size],
frame_size_bytes);
{
std::scoped_lock lk{sample_count_lock};
last_sample_count_update_time = Core::Timing::CyclesToUs(system.CoreTiming().GetClockTicks());
min_played_sample_count = max_played_sample_count;
max_played_sample_count += actual_frames_written;
}
if (system.IsMulticore() && queued_buffers <= max_queue_size) {
Unstall();
}
@ -282,4 +293,14 @@ void SinkStream::Unstall() {
stalled_lock.unlock();
}
u64 SinkStream::GetExpectedPlayedSampleCount() {
std::scoped_lock lk{sample_count_lock};
auto cur_time{Core::Timing::CyclesToUs(system.CoreTiming().GetClockTicks())};
auto time_delta{cur_time - last_sample_count_update_time};
auto exp_played_sample_count{min_played_sample_count +
(TargetSampleRate * time_delta) / std::chrono::seconds{1}};
return std::min<u64>(exp_played_sample_count, max_played_sample_count);
}
} // namespace AudioCore::Sink

View file

@ -5,6 +5,7 @@
#include <array>
#include <atomic>
#include <chrono>
#include <memory>
#include <mutex>
#include <span>
@ -14,6 +15,7 @@
#include "common/common_types.h"
#include "common/reader_writer_queue.h"
#include "common/ring_buffer.h"
#include "common/thread.h"
namespace Core {
class System;
@ -210,6 +212,13 @@ public:
*/
void Unstall();
/**
* Get the total number of samples expected to have been played by this stream.
*
* @return The number of samples.
*/
u64 GetExpectedPlayedSampleCount();
protected:
/// Core system
Core::System& system;
@ -237,6 +246,14 @@ private:
std::atomic<u32> queued_buffers{};
/// The ring size for audio out buffers (usually 4, rarely 2 or 8)
u32 max_queue_size{};
/// Locks access to sample count tracking info
std::mutex sample_count_lock;
/// Minimum number of total samples that have been played since the last callback
u64 min_played_sample_count{};
/// Maximum number of total samples that can be played since the last callback
u64 max_played_sample_count{};
/// The time the two above tracking variables were last written to
std::chrono::microseconds last_sample_count_update_time{};
/// Set by the audio render/in/out system which uses this stream
f32 system_volume{1.0f};
/// Set via IAudioDevice service calls