diff -Naur chromium-83.0.4103.97.orig/media/BUILD.gn chromium-83.0.4103.97/media/BUILD.gn
--- chromium-129.0.6668.58/media/BUILD.gn	2024-09-18 00:00:12.319230000 +0200
+++ -	2024-09-19 19:44:06.486438185 +0200
@@ -66,6 +66,7 @@
     "USE_CHROMEOS_PROTECTED_MEDIA=$use_chromeos_protected_media",
     "USE_CRAS=$use_cras",
     "USE_PROPRIETARY_CODECS=$proprietary_codecs",
+    "USE_SNDIO=$use_sndio",
   ]
 
   if (enable_library_cdms) {
diff -Naur chromium-83.0.4103.97.orig/media/audio/BUILD.gn chromium-83.0.4103.97/media/audio/BUILD.gn
--- a/media/audio/BUILD.gn	2020-06-03 20:39:37.000000000 +0200
+++ b/media/audio/BUILD.gn	2020-06-13 17:32:28.511395969 +0200
@@ -236,6 +236,17 @@
     sources += [ "linux/audio_manager_linux.cc" ]
   }
 
+  if (use_sndio) {
+    libs += [ "sndio" ]
+    sources += [
+      "sndio/audio_manager_sndio.cc",
+      "sndio/sndio_input.cc",
+      "sndio/sndio_input.h",
+      "sndio/sndio_output.cc",
+      "sndio/sndio_output.h"
+    ]
+  }
+
   if (use_alsa) {
     libs += [ "asound" ]
     sources += [
diff -Naur chromium-83.0.4103.97.orig/media/audio/linux/audio_manager_linux.cc chromium-83.0.4103.97/media/audio/linux/audio_manager_linux.cc
--- a/media/audio/linux/audio_manager_linux.cc	2020-06-03 20:39:37.000000000 +0200
+++ b/media/audio/linux/audio_manager_linux.cc	2020-06-13 18:09:43.623333167 +0200
@@ -19,6 +19,11 @@
 #include "media/audio/pulse/audio_manager_pulse.h"
 #include "media/audio/pulse/pulse_util.h"
 #endif
+#if defined(USE_SNDIO)
+#include "media/audio/sndio/audio_manager_sndio.h"
+#include "media/audio/sndio/sndio_input.h"
+#include "media/audio/sndio/sndio_output.h"
+#endif
 
 namespace media {
 
 std::unique_ptr<media::AudioManager> CreateAudioManager(
@@ -39,6 +45,16 @@
                                               audio_log_factory);
   }
 
+#if defined(USE_SNDIO)
+  struct sio_hdl *hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0);
+  if (hdl != NULL) {
+    sio_close(hdl);
+    UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kSndio, kAudioIOMax + 1);
+    return std::make_unique<AudioManagerSndio>(std::move(audio_thread),
+                                                  audio_log_factory);
+  }
+#endif
+
 #if defined(USE_CRAS)
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseCras)) {
     UMA_HISTOGRAM_ENUMERATION("Media.LinuxAudioIO", kCras, kAudioIOMax + 1);
diff -Naur chromium-83.0.4103.97.orig/media/audio/sndio/audio_manager_sndio.cc chromium-83.0.4103.97/media/audio/sndio/audio_manager_sndio.cc
--- a/media/audio/sndio/audio_manager_sndio.cc	1970-01-01 01:00:00.000000000 +0100
+++ b/media/audio/sndio/audio_manager_sndio.cc	2020-06-13 17:32:28.511395969 +0200
@@ -0,0 +1,148 @@
+// Copyright (c) 2012 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.
+
+#include "media/audio/sndio/audio_manager_sndio.h"
+
+#include "base/metrics/histogram_macros.h"
+#include "base/memory/ptr_util.h"
+#include "media/audio/audio_device_description.h"
+#include "media/audio/audio_output_dispatcher.h"
+#include "media/audio/sndio/sndio_input.h"
+#include "media/audio/sndio/sndio_output.h"
+#include "media/base/limits.h"
+#include "media/base/media_switches.h"
+
+namespace media {
+
+
+// Maximum number of output streams that can be open simultaneously.
+static const int kMaxOutputStreams = 4;
+
+// Default sample rate for input and output streams.
+static const int kDefaultSampleRate = 48000;
+
+void AddDefaultDevice(AudioDeviceNames* device_names) {
+  DCHECK(device_names->empty());
+  device_names->push_front(AudioDeviceName::CreateDefault());
+}
+
+bool AudioManagerSndio::HasAudioOutputDevices() {
+  return true;
+}
+
+bool AudioManagerSndio::HasAudioInputDevices() {
+  return true;
+}
+
+void AudioManagerSndio::GetAudioInputDeviceNames(
+    AudioDeviceNames* device_names) {
+  DCHECK(device_names->empty());
+  AddDefaultDevice(device_names);
+}
+
+void AudioManagerSndio::GetAudioOutputDeviceNames(
+    AudioDeviceNames* device_names) {
+  AddDefaultDevice(device_names);
+}
+
+const char* AudioManagerSndio::GetName() {
+  return "SNDIO";
+}
+
+AudioParameters AudioManagerSndio::GetInputStreamParameters(
+    const std::string& device_id) {
+  static const int kDefaultInputBufferSize = 1024;
+
+  int user_buffer_size = GetUserBufferSize();
+  int buffer_size = user_buffer_size ?
+      user_buffer_size : kDefaultInputBufferSize;
+
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
+      kDefaultSampleRate, buffer_size);
+}
+
+AudioManagerSndio::AudioManagerSndio(std::unique_ptr<AudioThread> audio_thread,
+                                         AudioLogFactory* audio_log_factory)
+    : AudioManagerBase(std::move(audio_thread),
+                       audio_log_factory) {
+  DLOG(WARNING) << "AudioManagerSndio";
+  SetMaxOutputStreamsAllowed(kMaxOutputStreams);
+}
+
+AudioManagerSndio::~AudioManagerSndio() {
+  Shutdown();
+}
+
+AudioOutputStream* AudioManagerSndio::MakeLinearOutputStream(
+    const AudioParameters& params,
+    const LogCallback& log_callback) {
+  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
+  return MakeOutputStream(params);
+}
+
+AudioOutputStream* AudioManagerSndio::MakeLowLatencyOutputStream(
+    const AudioParameters& params,
+    const std::string& device_id,
+    const LogCallback& log_callback) {
+  DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
+  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
+  return MakeOutputStream(params);
+}
+
+AudioInputStream* AudioManagerSndio::MakeLinearInputStream(
+    const AudioParameters& params,
+    const std::string& device_id,
+    const LogCallback& log_callback) {
+  DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
+  return MakeInputStream(params);
+}
+
+AudioInputStream* AudioManagerSndio::MakeLowLatencyInputStream(
+    const AudioParameters& params,
+    const std::string& device_id,
+    const LogCallback& log_callback) {
+  DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
+  return MakeInputStream(params);
+}
+
+AudioParameters AudioManagerSndio::GetPreferredOutputStreamParameters(
+    const std::string& output_device_id,
+    const AudioParameters& input_params) {
+  // TODO(tommi): Support |output_device_id|.
+  DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
+  static const int kDefaultOutputBufferSize = 2048;
+
+  ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
+  int sample_rate = kDefaultSampleRate;
+  int buffer_size = kDefaultOutputBufferSize;
+  if (input_params.IsValid()) {
+    sample_rate = input_params.sample_rate();
+    channel_layout = input_params.channel_layout();
+    buffer_size = std::min(buffer_size, input_params.frames_per_buffer());
+  }
+
+  int user_buffer_size = GetUserBufferSize();
+  if (user_buffer_size)
+    buffer_size = user_buffer_size;
+
+  return AudioParameters(
+      AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
+      sample_rate, buffer_size);
+}
+
+AudioInputStream* AudioManagerSndio::MakeInputStream(
+    const AudioParameters& params) {
+  DLOG(WARNING) << "MakeInputStream";
+  return new SndioAudioInputStream(this,
+             AudioDeviceDescription::kDefaultDeviceId, params);
+}
+
+AudioOutputStream* AudioManagerSndio::MakeOutputStream(
+    const AudioParameters& params) {
+  DLOG(WARNING) << "MakeOutputStream";
+  return new SndioAudioOutputStream(params, this);
+}
+
+}  // namespace media
diff -Naur chromium-83.0.4103.97.orig/media/audio/sndio/audio_manager_sndio.h chromium-83.0.4103.97/media/audio/sndio/audio_manager_sndio.h
--- a/media/audio/sndio/audio_manager_sndio.h	1970-01-01 01:00:00.000000000 +0100
+++ b/media/audio/sndio/audio_manager_sndio.h	2020-06-13 17:32:28.511395969 +0200
@@ -0,0 +1,65 @@
+// Copyright (c) 2012 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_AUDIO_MANAGER_SNDIO_H_
+#define MEDIA_AUDIO_SNDIO_AUDIO_MANAGER_SNDIO_H_
+
+#include <set>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/thread.h"
+#include "media/audio/audio_manager_base.h"
+
+namespace media {
+
+class MEDIA_EXPORT AudioManagerSndio : public AudioManagerBase {
+ public:
+  AudioManagerSndio(std::unique_ptr<AudioThread> audio_thread,
+                   AudioLogFactory* audio_log_factory);
+  ~AudioManagerSndio() override;
+
+  // Implementation of AudioManager.
+  bool HasAudioOutputDevices() override;
+  bool HasAudioInputDevices() override;
+  void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
+  void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override;
+  AudioParameters GetInputStreamParameters(
+      const std::string& device_id) override;
+  const char* GetName() override;
+
+  // Implementation of AudioManagerBase.
+  AudioOutputStream* MakeLinearOutputStream(
+      const AudioParameters& params,
+      const LogCallback& log_callback) override;
+  AudioOutputStream* MakeLowLatencyOutputStream(
+      const AudioParameters& params,
+      const std::string& device_id,
+      const LogCallback& log_callback) override;
+  AudioInputStream* MakeLinearInputStream(
+      const AudioParameters& params,
+      const std::string& device_id,
+      const LogCallback& log_callback) override;
+  AudioInputStream* MakeLowLatencyInputStream(
+      const AudioParameters& params,
+      const std::string& device_id,
+      const LogCallback& log_callback) override;
+
+ protected:
+  AudioParameters GetPreferredOutputStreamParameters(
+      const std::string& output_device_id,
+      const AudioParameters& input_params) override;
+
+ private:
+  // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
+  AudioOutputStream* MakeOutputStream(const AudioParameters& params);
+  AudioInputStream* MakeInputStream(const AudioParameters& params);
+
+  DISALLOW_COPY_AND_ASSIGN(AudioManagerSndio);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_SNDIO_AUDIO_MANAGER_SNDIO_H_
diff -Naur chromium-83.0.4103.97.orig/media/audio/sndio/sndio_input.cc chromium-83.0.4103.97/media/audio/sndio/sndio_input.cc
--- a/media/audio/sndio/sndio_input.cc	1970-01-01 01:00:00.000000000 +0100
+++ b/media/audio/sndio/sndio_input.cc	2020-06-13 17:32:28.511395969 +0200
@@ -0,0 +1,200 @@
+// 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.
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "media/base/audio_timestamp_helper.h"
+#include "media/audio/sndio/audio_manager_sndio.h"
+#include "media/audio/audio_manager.h"
+#include "media/audio/sndio/sndio_input.h"
+
+namespace media {
+
+static const SampleFormat kSampleFormat = kSampleFormatS16;
+
+void SndioAudioInputStream::OnMoveCallback(void *arg, int delta)
+{
+  SndioAudioInputStream* self = static_cast<SndioAudioInputStream*>(arg);
+
+  self->hw_delay += delta;
+}
+
+void *SndioAudioInputStream::ThreadEntry(void *arg) {
+  SndioAudioInputStream* self = static_cast<SndioAudioInputStream*>(arg);
+
+  self->ThreadLoop();
+  return NULL;
+}
+
+SndioAudioInputStream::SndioAudioInputStream(AudioManagerBase* manager,
+                                             const std::string& device_name,
+                                             const AudioParameters& params)
+    : manager(manager),
+      params(params),
+      audio_bus(AudioBus::Create(params)),
+      state(kClosed) {
+}
+
+SndioAudioInputStream::~SndioAudioInputStream() {
+  if (state != kClosed)
+    Close();
+}
+
+bool SndioAudioInputStream::Open() {
+  struct sio_par par;
+  int sig;
+
+  if (state != kClosed)
+    return false;
+
+  if (params.format() != AudioParameters::AUDIO_PCM_LINEAR &&
+      params.format() != AudioParameters::AUDIO_PCM_LOW_LATENCY) {
+    LOG(WARNING) << "Unsupported audio format.";
+    return false;
+  }
+
+  sio_initpar(&par);
+  par.rate = params.sample_rate();
+  par.rchan = params.channels();
+  par.bits = SampleFormatToBitsPerChannel(kSampleFormat);
+  par.bps = par.bits / 8;
+  par.sig = sig = par.bits != 8 ? 1 : 0;
+  par.le = SIO_LE_NATIVE;
+  par.appbufsz = params.frames_per_buffer();
+
+  hdl = sio_open(SIO_DEVANY, SIO_REC, 0);
+
+  if (hdl == NULL) {
+    LOG(ERROR) << "Couldn't open audio device.";
+    return false;
+  }
+
+  if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
+    LOG(ERROR) << "Couldn't set audio parameters.";
+    goto bad_close;
+  }
+
+  if (par.rate  != (unsigned int)params.sample_rate() ||
+      par.rchan != (unsigned int)params.channels() ||
+      par.bits  != (unsigned int)SampleFormatToBitsPerChannel(kSampleFormat) ||
+      par.sig   != (unsigned int)sig ||
+      (par.bps > 1 && par.le != SIO_LE_NATIVE) ||
+      (par.bits != par.bps * 8)) {
+    LOG(ERROR) << "Unsupported audio parameters.";
+    goto bad_close;
+  }
+  state = kStopped;
+  buffer = new char[audio_bus->frames() * params.GetBytesPerFrame(kSampleFormat)];
+  sio_onmove(hdl, &OnMoveCallback, this);
+  return true;
+bad_close:
+  sio_close(hdl);
+  return false;
+}
+
+void SndioAudioInputStream::Start(AudioInputCallback* cb) {
+
+  StartAgc();
+
+  state = kRunning;
+  hw_delay = 0;
+  callback = cb;
+  sio_start(hdl);
+  if (pthread_create(&thread, NULL, &ThreadEntry, this) != 0) {
+    LOG(ERROR) << "Failed to create real-time thread for recording.";
+    sio_stop(hdl);
+    state = kStopped;
+  }
+}
+
+void SndioAudioInputStream::Stop() {
+
+  if (state == kStopped)
+    return;
+
+  state = kStopWait;
+  pthread_join(thread, NULL);
+  sio_stop(hdl);
+  state = kStopped;
+
+  StopAgc();
+}
+
+void SndioAudioInputStream::Close() {
+
+  if (state == kClosed)
+    return;
+
+  if (state == kRunning)
+    Stop();
+
+  state = kClosed;
+  delete [] buffer;
+  sio_close(hdl);
+
+  manager->ReleaseInputStream(this);
+}
+
+double SndioAudioInputStream::GetMaxVolume() {
+  // Not supported
+  return 0.0;
+}
+
+void SndioAudioInputStream::SetVolume(double volume) {
+  // Not supported. Do nothing.
+}
+
+double SndioAudioInputStream::GetVolume() {
+  // Not supported.
+  return 0.0;
+}
+
+bool SndioAudioInputStream::IsMuted() {
+  // Not supported.
+  return false;
+}
+
+void SndioAudioInputStream::SetOutputDeviceForAec(
+    const std::string& output_device_id) {
+  // Not supported.
+}
+
+void SndioAudioInputStream::ThreadLoop(void) {
+  size_t todo, n;
+  char *data;
+  unsigned int nframes;
+  double normalized_volume = 0.0;
+
+  nframes = audio_bus->frames();
+
+  while (state == kRunning && !sio_eof(hdl)) {
+
+    GetAgcVolume(&normalized_volume);
+
+    // read one block
+    todo = nframes * params.GetBytesPerFrame(kSampleFormat);
+    data = buffer;
+    while (todo > 0) {
+      n = sio_read(hdl, data, todo);
+      if (n == 0)
+        return;	// unrecoverable I/O error
+      todo -= n;
+      data += n;
+    }
+    hw_delay -= nframes;
+
+    // convert frames count to TimeDelta
+    const base::TimeDelta delay = AudioTimestampHelper::FramesToTime(hw_delay,
+      params.sample_rate());
+
+    // push into bus
+    audio_bus->FromInterleaved<SignedInt16SampleTypeTraits>(reinterpret_cast<int16_t*>(buffer), nframes);
+
+    // invoke callback
+    callback->OnData(audio_bus.get(), base::TimeTicks::Now() - delay, 1.);
+  }
+}
+
+}  // namespace media
diff -Naur chromium-83.0.4103.97.orig/media/audio/sndio/sndio_input.h chromium-83.0.4103.97/media/audio/sndio/sndio_input.h
--- a/media/audio/sndio/sndio_input.h	1970-01-01 01:00:00.000000000 +0100
+++ b/media/audio/sndio/sndio_input.h	2020-06-13 17:32:28.511395969 +0200
@@ -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/macros.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() override;
+
+  // Implementation of AudioInputStream.
+  bool 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;
+
+  DISALLOW_COPY_AND_ASSIGN(SndioAudioInputStream);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_SNDIO_SNDIO_INPUT_H_
diff -Naur chromium-83.0.4103.97.orig/media/audio/sndio/sndio_output.cc chromium-83.0.4103.97/media/audio/sndio/sndio_output.cc
--- a/media/audio/sndio/sndio_output.cc	1970-01-01 01:00:00.000000000 +0100
+++ b/media/audio/sndio/sndio_output.cc	2020-06-13 17:32:28.511395969 +0200
@@ -0,0 +1,183 @@
+// Copyright (c) 2012 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.
+
+#include "base/logging.h"
+#include "base/time/time.h"
+#include "base/time/default_tick_clock.h"
+#include "media/audio/audio_manager_base.h"
+#include "media/base/audio_timestamp_helper.h"
+#include "media/audio/sndio/sndio_output.h"
+
+namespace media {
+
+static const SampleFormat kSampleFormat = kSampleFormatS16;
+
+void SndioAudioOutputStream::OnMoveCallback(void *arg, int delta) {
+  SndioAudioOutputStream* self = static_cast<SndioAudioOutputStream*>(arg);
+
+  self->hw_delay -= delta;
+}
+
+void SndioAudioOutputStream::OnVolCallback(void *arg, unsigned int vol) {
+  SndioAudioOutputStream* self = static_cast<SndioAudioOutputStream*>(arg);
+
+  self->vol = vol;
+}
+
+void *SndioAudioOutputStream::ThreadEntry(void *arg) {
+  SndioAudioOutputStream* self = static_cast<SndioAudioOutputStream*>(arg);
+
+  self->ThreadLoop();
+  return NULL;
+}
+
+SndioAudioOutputStream::SndioAudioOutputStream(const AudioParameters& params,
+                                               AudioManagerBase* manager)
+    : manager(manager),
+      params(params),
+      audio_bus(AudioBus::Create(params)),
+      state(kClosed),
+      mutex(PTHREAD_MUTEX_INITIALIZER) {
+}
+
+SndioAudioOutputStream::~SndioAudioOutputStream() {
+  if (state != kClosed)
+    Close();
+}
+
+bool SndioAudioOutputStream::Open() {
+  struct sio_par par;
+  int sig;
+
+  if (params.format() != AudioParameters::AUDIO_PCM_LINEAR &&
+      params.format() != AudioParameters::AUDIO_PCM_LOW_LATENCY) {
+    LOG(WARNING) << "Unsupported audio format.";
+    return false;
+  }
+  sio_initpar(&par);
+  par.rate = params.sample_rate();
+  par.pchan = params.channels();
+  par.bits = SampleFormatToBitsPerChannel(kSampleFormat);
+  par.bps = par.bits / 8;
+  par.sig = sig = par.bits != 8 ? 1 : 0;
+  par.le = SIO_LE_NATIVE;
+  par.appbufsz = params.frames_per_buffer();
+
+  hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0);
+  if (hdl == NULL) {
+    LOG(ERROR) << "Couldn't open audio device.";
+    return false;
+  }
+  if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
+    LOG(ERROR) << "Couldn't set audio parameters.";
+    goto bad_close;
+  }
+  if (par.rate  != (unsigned int)params.sample_rate() ||
+      par.pchan != (unsigned int)params.channels() ||
+      par.bits  != (unsigned int)SampleFormatToBitsPerChannel(kSampleFormat) ||
+      par.sig   != (unsigned int)sig ||
+      (par.bps > 1 && par.le != SIO_LE_NATIVE) ||
+      (par.bits != par.bps * 8)) {
+    LOG(ERROR) << "Unsupported audio parameters.";
+    goto bad_close;
+  }
+  state = kStopped;
+  volpending = 0;
+  vol = 0;
+  buffer = new char[audio_bus->frames() * params.GetBytesPerFrame(kSampleFormat)];
+  sio_onmove(hdl, &OnMoveCallback, this);
+  sio_onvol(hdl, &OnVolCallback, this);
+  return true;
+ bad_close:
+  sio_close(hdl);
+  return false;
+}
+
+void SndioAudioOutputStream::Close() {
+  if (state == kClosed)
+    return;
+  if (state == kRunning)
+    Stop();
+  state = kClosed;
+  delete [] buffer;
+  sio_close(hdl);
+  manager->ReleaseOutputStream(this);  // Calls the destructor
+}
+
+void SndioAudioOutputStream::Start(AudioSourceCallback* callback) {
+  state = kRunning;
+  hw_delay = 0;
+  source = callback;
+  sio_start(hdl);
+  if (pthread_create(&thread, NULL, &ThreadEntry, this) != 0) {
+    LOG(ERROR) << "Failed to create real-time thread.";
+    sio_stop(hdl);
+    state = kStopped;
+  }
+}
+
+void SndioAudioOutputStream::Stop() {
+  if (state == kStopped)
+    return;
+  state = kStopWait;
+  pthread_join(thread, NULL);
+  sio_stop(hdl);
+  state = kStopped;
+}
+
+void SndioAudioOutputStream::SetVolume(double v) {
+  pthread_mutex_lock(&mutex);
+  vol = v * SIO_MAXVOL;
+  volpending = 1;
+  pthread_mutex_unlock(&mutex);
+}
+
+void SndioAudioOutputStream::GetVolume(double* v) {
+  pthread_mutex_lock(&mutex);
+  *v = vol * (1. / SIO_MAXVOL);
+  pthread_mutex_unlock(&mutex);
+}
+
+// This stream is always used with sub second buffer sizes, where it's
+// sufficient to simply always flush upon Start().
+void SndioAudioOutputStream::Flush() {}
+
+void SndioAudioOutputStream::ThreadLoop(void) {
+  int avail, count, result;
+
+  while (state == kRunning) {
+    // Update volume if needed
+    pthread_mutex_lock(&mutex);
+    if (volpending) {
+      volpending = 0;
+      sio_setvol(hdl, vol);
+    }
+    pthread_mutex_unlock(&mutex);
+
+    // Get data to play
+    const base::TimeDelta delay = AudioTimestampHelper::FramesToTime(hw_delay,
+	params.sample_rate());
+    count = source->OnMoreData(delay, base::TimeTicks::Now(), 0, audio_bus.get());
+    audio_bus->ToInterleaved<SignedInt16SampleTypeTraits>(count, reinterpret_cast<int16_t*>(buffer));
+    if (count == 0) {
+      // We have to submit something to the device
+      count = audio_bus->frames();
+      memset(buffer, 0, count * params.GetBytesPerFrame(kSampleFormat));
+      LOG(WARNING) << "No data to play, running empty cycle.";
+    }
+
+    // Submit data to the device
+    avail = count * params.GetBytesPerFrame(kSampleFormat);
+    result = sio_write(hdl, buffer, avail);
+    if (result == 0) {
+      LOG(WARNING) << "Audio device disconnected.";
+      break;
+    }
+
+    // Update hardware pointer
+    hw_delay += count;
+  }
+}
+
+}  // namespace media
diff -Naur chromium-83.0.4103.97.orig/media/audio/sndio/sndio_output.h chromium-83.0.4103.97/media/audio/sndio/sndio_output.h
--- a/media/audio/sndio/sndio_output.h	1970-01-01 01:00:00.000000000 +0100
+++ b/media/audio/sndio/sndio_output.h	2020-06-13 17:32:28.511395969 +0200
@@ -0,0 +1,86 @@
+// Copyright (c) 2012 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_OUTPUT_H_
+#define MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_
+
+#include <pthread.h>
+#include <sndio.h>
+
+#include "base/time/tick_clock.h"
+#include "base/time/time.h"
+#include "media/audio/audio_io.h"
+
+namespace media {
+
+class AudioManagerBase;
+
+// Implementation of AudioOutputStream using sndio(7)
+class SndioAudioOutputStream : public AudioOutputStream {
+ public:
+  // The manager is creating this object
+  SndioAudioOutputStream(const AudioParameters& params,
+                         AudioManagerBase* manager);
+  virtual ~SndioAudioOutputStream();
+
+  // Implementation of AudioOutputStream.
+  bool Open() override;
+  void Close() override;
+  void Start(AudioSourceCallback* callback) override;
+  void Stop() override;
+  void SetVolume(double volume) override;
+  void GetVolume(double* volume) override;
+  void Flush() override;
+
+  friend void sndio_onmove(void *arg, int delta);
+  friend void sndio_onvol(void *arg, unsigned int vol);
+  friend void *sndio_threadstart(void *arg);
+
+ 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 OnVolCallback(void *arg, unsigned int vol);
+  static void* ThreadEntry(void *arg);
+
+  // Continuously moves data from the producer to the device
+  void ThreadLoop(void);
+
+  // Our creator, the audio manager needs to be notified when we close.
+  AudioManagerBase* manager;
+  // Parameters of the source
+  AudioParameters params;
+  // Source stores data here
+  std::unique_ptr<AudioBus> audio_bus;
+  // Call-back that produces data to play
+  AudioSourceCallback* source;
+  // 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;
+  // Protects vol, volpending and hw_delay
+  pthread_mutex_t mutex;
+  // Current volume in the 0..SIO_MAXVOL range
+  int vol;
+  // Set to 1 if volumes must be refreshed in the realtime thread
+  int volpending;
+  // Number of frames buffered in the hardware
+  int hw_delay;
+  // Temporary buffer where data is stored sndio-compatible format
+  char* buffer;
+
+  DISALLOW_COPY_AND_ASSIGN(SndioAudioOutputStream);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_AUDIO_SNDIO_SNDIO_OUTPUT_H_
diff -Naur chromium-83.0.4103.97.orig/media/media_options.gni chromium-83.0.4103.97/media/media_options.gni
--- a/media/media_options.gni
+++ b/media/media_options.gni
@@ -158,6 +158,9 @@
   # Enables runtime selection of ALSA library for audio.
   use_alsa = false
 
+  # Enable runtime selection of sndio(7)
+  use_sndio = false
+
   # Alsa should be used on all non-Android, non-Mac POSIX systems - with the
   # exception of CastOS desktop builds.
   #
