Don't stall with nvdec

src/audio_core/audio_core.cpp

@@ -57,4 +57,12 @@ void AudioCore::PauseSinks(const bool pausing) const {
     }
 }
 
+void AudioCore::SetNVDECActive(bool active) {
+    nvdec_active = active;
+}
+
+bool AudioCore::IsNVDECActive() const {
+    return nvdec_active;
+}
+
 } // namespace AudioCore

src/audio_core/audio_core.h

@@ -65,6 +65,18 @@ public:
      */
     void PauseSinks(bool pausing) const;
 
+    /**
+     * Toggle NVDEC state, used to avoid stall in playback.
+     *
+     * @param active - Set true if nvdec is active, otherwise false.
+     */
+    void SetNVDECActive(bool active);
+
+    /**
+     * Get NVDEC state.
+     */
+    bool IsNVDECActive() const;
+
 private:
     /**
      * Create the sinks on startup.
@@ -79,6 +91,8 @@ private:
     std::unique_ptr<Sink::Sink> input_sink;
     /// The ADSP in the sysmodule
     std::unique_ptr<AudioRenderer::ADSP::ADSP> adsp;
+    /// Is NVDec currently active?
+    bool nvdec_active{false};
 };
 
 } // namespace AudioCore

src/audio_core/sink/sink_stream.cpp

@@ -9,6 +9,7 @@
 #include <span>
 #include <vector>
 
+#include "audio_core/audio_core.h"
 #include "audio_core/common/common.h"
 #include "audio_core/sink/sink_stream.h"
 #include "common/common_types.h"
@@ -194,7 +195,12 @@ void SinkStream::ProcessAudioOutAndRender(std::span<s16> output_buffer, std::siz
     const std::size_t frame_size_bytes = frame_size * sizeof(s16);
     size_t frames_written{0};
 
-    if (queued_buffers > max_queue_size) {
+    // Due to many frames being queued up with nvdec (5 frames or so?), a lot of buffers also get
+    // queued up (30+) but not all at once, which causes constant stalling here, so just let the
+    // video play out without attempting to stall.
+    // Can hopefully remove this later with a more complete NVDEC implementation.
+    const auto nvdec_active{system.AudioCore().IsNVDECActive()};
+    if (!nvdec_active && queued_buffers > max_queue_size) {
         Stall();
     }
 

src/core/hle/service/nvdrv/devices/nvhost_nvdec.cpp

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include "audio_core/audio_core.h"
 #include "common/assert.h"
 #include "common/logging/log.h"
 #include "core/core.h"
@@ -65,7 +66,10 @@ NvResult nvhost_nvdec::Ioctl3(DeviceFD fd, Ioctl command, const std::vector<u8>&
     return NvResult::NotImplemented;
 }
 
-void nvhost_nvdec::OnOpen(DeviceFD fd) {}
+void nvhost_nvdec::OnOpen(DeviceFD fd) {
+    LOG_INFO(Service_NVDRV, "NVDEC video stream started");
+    system.AudioCore().SetNVDECActive(true);
+}
 
 void nvhost_nvdec::OnClose(DeviceFD fd) {
     LOG_INFO(Service_NVDRV, "NVDEC video stream ended");
@@ -73,6 +77,7 @@ void nvhost_nvdec::OnClose(DeviceFD fd) {
     if (iter != fd_to_id.end()) {
         system.GPU().ClearCdmaInstance(iter->second);
     }
+    system.AudioCore().SetNVDECActive(false);
 }
 
 } // namespace Service::Nvidia::Devices