--- media/audio/sndio/sndio_input.h.orig	2022-03-28 18:11:04 UTC
+++ media/audio/sndio/sndio_input.h
@@ -0,0 +1,91 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_
+#define MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_
+
+#include <stdint.h>
+#include <string>
+#include <sndio.h>
+
+#include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
+#include "media/audio/agc_audio_stream.h"
+#include "media/audio/audio_io.h"
+#include "media/audio/audio_device_description.h"
+#include "media/base/audio_parameters.h"
+
+namespace media {
+
+class AudioManagerBase;
+
+// Implementation of AudioOutputStream using sndio(7)
+class SndioAudioInputStream : public AgcAudioStream<AudioInputStream> {
+ public:
+  // Pass this to the constructor if you want to attempt auto-selection
+  // of the audio recording device.
+  static const char kAutoSelectDevice[];
+
+  // Create a PCM Output stream for the SNDIO device identified by
+  // |device_name|. If unsure of what to use for |device_name|, use
+  // |kAutoSelectDevice|.
+  SndioAudioInputStream(AudioManagerBase* audio_manager,
+                     const std::string& device_name,
+                     const AudioParameters& params);
+
+  SndioAudioInputStream(const SndioAudioInputStream&) = delete;
+  SndioAudioInputStream& operator=(const SndioAudioInputStream&) = delete;
+
+  ~SndioAudioInputStream() override;
+
+  // Implementation of AudioInputStream.
+  OpenOutcome Open() override;
+  void Start(AudioInputCallback* callback) override;
+  void Stop() override;
+  void Close() override;
+  double GetMaxVolume() override;
+  void SetVolume(double volume) override;
+  double GetVolume() override;
+  bool IsMuted() override;
+  void SetOutputDeviceForAec(const std::string& output_device_id) override;
+
+ private:
+
+  enum StreamState {
+    kClosed,            // Not opened yet
+    kStopped,           // Device opened, but not started yet
+    kRunning,           // Started, device playing
+    kStopWait           // Stopping, waiting for the real-time thread to exit
+  };
+
+  // C-style call-backs
+  static void OnMoveCallback(void *arg, int delta);
+  static void* ThreadEntry(void *arg);
+
+  // Continuously moves data from the device to the consumer
+  void ThreadLoop();
+  // Our creator, the audio manager needs to be notified when we close.
+  AudioManagerBase* manager;
+  // Parameters of the source
+  AudioParameters params;
+  // We store data here for consumer
+  std::unique_ptr<AudioBus> audio_bus;
+  // Call-back that consumes recorded data
+  AudioInputCallback* callback;  // Valid during a recording session.
+  // Handle of the audio device
+  struct sio_hdl* hdl;
+  // Current state of the stream
+  enum StreamState state;
+  // High priority thread running ThreadLoop()
+  pthread_t thread;
+  // Number of frames buffered in the hardware
+  int hw_delay;
+  // Temporary buffer where data is stored sndio-compatible format
+  char* buffer;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_