Reland 153623004: Remove the unified IO code on the browser

media/audio/pulse/pulse_unified.cc

Index: media/audio/pulse/pulse_unified.cc
diff --git a/media/audio/pulse/pulse_unified.cc b/media/audio/pulse/pulse_unified.cc
deleted file mode 100644
index cd17b018705eb767bc3ef84acc3b23c9a1206656..0000000000000000000000000000000000000000
--- a/media/audio/pulse/pulse_unified.cc
+++ /dev/null
@@ -1,292 +0,0 @@
-// 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 "media/audio/pulse/pulse_unified.h"
-
-#include "base/single_thread_task_runner.h"
-#include "base/time/time.h"
-#include "media/audio/audio_manager_base.h"
-#include "media/audio/audio_parameters.h"
-#include "media/audio/pulse/pulse_util.h"
-#include "media/base/seekable_buffer.h"
-
-namespace media {
-
-using pulse::AutoPulseLock;
-using pulse::WaitForOperationCompletion;
-
-static const int kFifoSizeInPackets = 10;
-
-// static, pa_stream_notify_cb
-void PulseAudioUnifiedStream::StreamNotifyCallback(pa_stream* s,
-                                                   void* user_data) {
-  PulseAudioUnifiedStream* stream =
-      static_cast<PulseAudioUnifiedStream*>(user_data);
-
-  // Forward unexpected failures to the AudioSourceCallback if available.  All
-  // these variables are only modified under pa_threaded_mainloop_lock() so this
-  // should be thread safe.
-  if (s && stream->source_callback_ &&
-      pa_stream_get_state(s) == PA_STREAM_FAILED) {
-    stream->source_callback_->OnError(stream);
-  }
-
-  pa_threaded_mainloop_signal(stream->pa_mainloop_, 0);
-}
-
-// static, used by pa_stream_set_read_callback.
-void PulseAudioUnifiedStream::ReadCallback(pa_stream* handle, size_t length,
-                                           void* user_data) {
-  static_cast<PulseAudioUnifiedStream*>(user_data)->ReadData();
-}
-
-PulseAudioUnifiedStream::PulseAudioUnifiedStream(
-    const AudioParameters& params,
-    const std::string& input_device_id,
-    AudioManagerBase* manager)
-    : params_(params),
-      input_device_id_(input_device_id),
-      manager_(manager),
-      pa_context_(NULL),
-      pa_mainloop_(NULL),
-      input_stream_(NULL),
-      output_stream_(NULL),
-      volume_(1.0f),
-      source_callback_(NULL) {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-  CHECK(params_.IsValid());
-  input_bus_ = AudioBus::Create(params_);
-  output_bus_ = AudioBus::Create(params_);
-}
-
-PulseAudioUnifiedStream::~PulseAudioUnifiedStream() {
-  // All internal structures should already have been freed in Close(), which
-  // calls AudioManagerBase::ReleaseOutputStream() which deletes this object.
-  DCHECK(!input_stream_);
-  DCHECK(!output_stream_);
-  DCHECK(!pa_context_);
-  DCHECK(!pa_mainloop_);
-}
-
-bool PulseAudioUnifiedStream::Open() {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-  // Prepare the recording buffers for the callbacks.
-  fifo_.reset(new media::SeekableBuffer(
-      0, kFifoSizeInPackets * params_.GetBytesPerBuffer()));
-  input_data_buffer_.reset(new uint8[params_.GetBytesPerBuffer()]);
-
-  if (!pulse::CreateOutputStream(&pa_mainloop_, &pa_context_, &output_stream_,
-                                 params_, &StreamNotifyCallback, NULL, this))
-    return false;
-
-  if (!pulse::CreateInputStream(pa_mainloop_, pa_context_, &input_stream_,
-                                params_, input_device_id_,
-                                &StreamNotifyCallback, this))
-    return false;
-
-  DCHECK(pa_mainloop_);
-  DCHECK(pa_context_);
-  DCHECK(input_stream_);
-  DCHECK(output_stream_);
-  return true;
-}
-
-void PulseAudioUnifiedStream::Reset() {
-  if (!pa_mainloop_) {
-    DCHECK(!input_stream_);
-    DCHECK(!output_stream_);
-    DCHECK(!pa_context_);
-    return;
-  }
-
-  {
-    AutoPulseLock auto_lock(pa_mainloop_);
-
-    // Close the input stream.
-    if (input_stream_) {
-      // Disable all the callbacks before disconnecting.
-      pa_stream_set_state_callback(input_stream_, NULL, NULL);
-      pa_stream_flush(input_stream_, NULL, NULL);
-      pa_stream_disconnect(input_stream_);
-
-      // Release PulseAudio structures.
-      pa_stream_unref(input_stream_);
-      input_stream_ = NULL;
-    }
-
-    // Close the ouput stream.
-    if (output_stream_) {
-      // Release PulseAudio output stream structures.
-      pa_stream_set_state_callback(output_stream_, NULL, NULL);
-      pa_stream_disconnect(output_stream_);
-      pa_stream_unref(output_stream_);
-      output_stream_ = NULL;
-    }
-
-    if (pa_context_) {
-      pa_context_disconnect(pa_context_);
-      pa_context_set_state_callback(pa_context_, NULL, NULL);
-      pa_context_unref(pa_context_);
-      pa_context_ = NULL;
-    }
-  }
-
-  pa_threaded_mainloop_stop(pa_mainloop_);
-  pa_threaded_mainloop_free(pa_mainloop_);
-  pa_mainloop_ = NULL;
-}
-
-void PulseAudioUnifiedStream::Close() {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-  Reset();
-
-  // Signal to the manager that we're closed and can be removed.
-  // This should be the last call in the function as it deletes "this".
-  manager_->ReleaseOutputStream(this);
-}
-
-void PulseAudioUnifiedStream::WriteData(size_t requested_bytes) {
-  CHECK_EQ(requested_bytes, static_cast<size_t>(params_.GetBytesPerBuffer()));
-
-  void* buffer = NULL;
-  int frames_filled = 0;
-  if (source_callback_) {
-    CHECK_GE(pa_stream_begin_write(
-        output_stream_, &buffer, &requested_bytes), 0);
-    uint32 hardware_delay = pulse::GetHardwareLatencyInBytes(
-        output_stream_, params_.sample_rate(),
-        params_.GetBytesPerFrame());
-    fifo_->Read(input_data_buffer_.get(), requested_bytes);
-    input_bus_->FromInterleaved(
-        input_data_buffer_.get(), params_.frames_per_buffer(), 2);
-
-    frames_filled = source_callback_->OnMoreIOData(
-        input_bus_.get(),
-        output_bus_.get(),
-        AudioBuffersState(0, hardware_delay));
-  }
-
-  // Zero the unfilled data so it plays back as silence.
-  if (frames_filled < output_bus_->frames()) {
-    output_bus_->ZeroFramesPartial(
-        frames_filled, output_bus_->frames() - frames_filled);
-  }
-
-  // Note: If this ever changes to output raw float the data must be clipped
-  // and sanitized since it may come from an untrusted source such as NaCl.
-  output_bus_->Scale(volume_);
-  output_bus_->ToInterleaved(
-      output_bus_->frames(), params_.bits_per_sample() / 8, buffer);
-
-  if (pa_stream_write(output_stream_, buffer, requested_bytes, NULL, 0LL,
-                      PA_SEEK_RELATIVE) < 0) {
-    if (source_callback_) {
-      source_callback_->OnError(this);
-    }
-  }
-}
-
-void PulseAudioUnifiedStream::ReadData() {
-  do {
-    size_t length = 0;
-    const void* data = NULL;
-    pa_stream_peek(input_stream_, &data, &length);
-    if (!data || length == 0)
-      break;
-
-    fifo_->Append(reinterpret_cast<const uint8*>(data), length);
-
-    // Deliver the recording data to the renderer and drive the playout.
-    int packet_size = params_.GetBytesPerBuffer();
-    while (fifo_->forward_bytes() >= packet_size) {
-      WriteData(packet_size);
-    }
-
-    // Checks if we still have data.
-    pa_stream_drop(input_stream_);
-  } while (pa_stream_readable_size(input_stream_) > 0);
-
-  pa_threaded_mainloop_signal(pa_mainloop_, 0);
-}
-
-void PulseAudioUnifiedStream::Start(AudioSourceCallback* callback) {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-  CHECK(callback);
-  CHECK(input_stream_);
-  CHECK(output_stream_);
-  AutoPulseLock auto_lock(pa_mainloop_);
-
-  // Ensure the context and stream are ready.
-  if (pa_context_get_state(pa_context_) != PA_CONTEXT_READY &&
-      pa_stream_get_state(output_stream_) != PA_STREAM_READY &&
-      pa_stream_get_state(input_stream_) != PA_STREAM_READY) {
-    callback->OnError(this);
-    return;
-  }
-
-  source_callback_ = callback;
-
-  fifo_->Clear();
-
-  // Uncork (resume) the input stream.
-  pa_stream_set_read_callback(input_stream_, &ReadCallback, this);
-  pa_stream_readable_size(input_stream_);
-  pa_operation* operation = pa_stream_cork(input_stream_, 0, NULL, NULL);
-  WaitForOperationCompletion(pa_mainloop_, operation);
-
-  // Uncork (resume) the output stream.
-  // We use the recording stream to drive the playback, so we do not need to
-  // register the write callback using pa_stream_set_write_callback().
-  operation = pa_stream_cork(output_stream_, 0,
-                             &pulse::StreamSuccessCallback, pa_mainloop_);
-  WaitForOperationCompletion(pa_mainloop_, operation);
-}
-
-void PulseAudioUnifiedStream::Stop() {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-
-  // Cork (pause) the stream.  Waiting for the main loop lock will ensure
-  // outstanding callbacks have completed.
-  AutoPulseLock auto_lock(pa_mainloop_);
-
-  // Set |source_callback_| to NULL so all FulfillWriteRequest() calls which may
-  // occur while waiting on the flush and cork exit immediately.
-  source_callback_ = NULL;
-
-  // Set the read callback to NULL before flushing the stream, otherwise it
-  // will cause deadlock on the operation.
-  pa_stream_set_read_callback(input_stream_, NULL, NULL);
-  pa_operation* operation = pa_stream_flush(
-      input_stream_, &pulse::StreamSuccessCallback, pa_mainloop_);
-  WaitForOperationCompletion(pa_mainloop_, operation);
-
-  operation = pa_stream_cork(input_stream_, 1, &pulse::StreamSuccessCallback,
-                             pa_mainloop_);
-  WaitForOperationCompletion(pa_mainloop_, operation);
-
-  // Flush the stream prior to cork, doing so after will cause hangs.  Write
-  // callbacks are suspended while inside pa_threaded_mainloop_lock() so this
-  // is all thread safe.
-  operation = pa_stream_flush(
-      output_stream_, &pulse::StreamSuccessCallback, pa_mainloop_);
-  WaitForOperationCompletion(pa_mainloop_, operation);
-
-  operation = pa_stream_cork(output_stream_, 1, &pulse::StreamSuccessCallback,
-                             pa_mainloop_);
-  WaitForOperationCompletion(pa_mainloop_, operation);
-}
-
-void PulseAudioUnifiedStream::SetVolume(double volume) {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-
-  volume_ = static_cast<float>(volume);
-}
-
-void PulseAudioUnifiedStream::GetVolume(double* volume) {
-  DCHECK(manager_->GetTaskRunner()->BelongsToCurrentThread());
-
-  *volume = volume_;
-}
-
-}  // namespace media