Chromecast: adds a media pipeline feeding data to CMA device backends.

chromecast/media/cma/pipeline/audio_pipeline_impl.cc

+// Copyright 2014 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 "chromecast/media/cma/pipeline/audio_pipeline_impl.h"
+
+#include "base/bind.h"
+#include "chromecast/media/cma/backend/audio_pipeline_device.h"
+#include "chromecast/media/cma/base/buffering_defs.h"
+#include "chromecast/media/cma/base/cma_logging.h"
+#include "chromecast/media/cma/base/coded_frame_provider.h"
+#include "chromecast/media/cma/pipeline/av_pipeline_impl.h"
+#include "media/base/audio_decoder_config.h"
+
+namespace chromecast {
+namespace media {
+
+namespace {
+const size_t kMaxAudioFrameSize = 32 * 1024;
+}
+
+AudioPipelineImpl::AudioPipelineImpl(AudioPipelineDevice* audio_device)
+    : audio_device_(audio_device),
+      weak_factory_(this) {
+  av_pipeline_impl_.reset(new AvPipelineImpl(
+      audio_device_,
+      base::Bind(&AudioPipelineImpl::OnUpdateConfig, base::Unretained(this))));
+  weak_this_ = weak_factory_.GetWeakPtr();
+}
+
+AudioPipelineImpl::~AudioPipelineImpl() {
+}
+
+void AudioPipelineImpl::SetCodedFrameProvider(
+    scoped_ptr<CodedFrameProvider> frame_provider) {
+  av_pipeline_impl_->SetCodedFrameProvider(
+      frame_provider.Pass(), kAppAudioBufferSize, kMaxAudioFrameSize);
+}
+
+void AudioPipelineImpl::SetClient(const AvPipelineClient& client) {
+  audio_client_ = client;
+  av_pipeline_impl_->SetClient(client);
+}
+
+bool AudioPipelineImpl::StartPlayingFrom(
+    base::TimeDelta time,
+    const scoped_refptr<BufferingState>& buffering_state) {
+  CMALOG(kLogControl) << "AudioPipelineImpl::StartPlayingFrom t0="
+                      << time.InMilliseconds();
+
+  // Reset the pipeline statistics.
+  previous_stats_ = ::media::PipelineStatistics();
+
+  // Start playing.
+  if (av_pipeline_impl_->GetState() == AvPipelineImpl::kError)
+    return false;
+  DCHECK_EQ(av_pipeline_impl_->GetState(), AvPipelineImpl::kFlushed);
+
+  if (!av_pipeline_impl_->StartPlayingFrom(time, buffering_state)) {
+    av_pipeline_impl_->TransitionToState(AvPipelineImpl::kError);
+    return false;
+  }
+  av_pipeline_impl_->TransitionToState(AvPipelineImpl::kPlaying);
+
+  return true;
+}
+
+void AudioPipelineImpl::Flush(const ::media::PipelineStatusCB& status_cb) {
+  CMALOG(kLogControl) << "AudioPipelineImpl::Flush";
+
+  // Pause the pipeline first.
+  if (av_pipeline_impl_->GetState() == AvPipelineImpl::kError ||
+      !av_pipeline_impl_->Pause()) {
+    av_pipeline_impl_->TransitionToState(AvPipelineImpl::kError);
+    status_cb.Run(::media::PIPELINE_ERROR_ABORT);
+    return;
+  }
+
+  // Then flush.
+  av_pipeline_impl_->TransitionToState(AvPipelineImpl::kFlushing);
+  av_pipeline_impl_->Flush(
+      base::Bind(&AudioPipelineImpl::OnFlushDone, weak_this_, status_cb));
+}
+
+void AudioPipelineImpl::OnFlushDone(
+    const ::media::PipelineStatusCB& status_cb) {
+  CMALOG(kLogControl) << "AudioPipelineImpl::OnFlushDone";
+  if (av_pipeline_impl_->GetState() == AvPipelineImpl::kError) {
+    status_cb.Run(::media::PIPELINE_ERROR_ABORT);
+    return;
+  }
+  av_pipeline_impl_->TransitionToState(AvPipelineImpl::kFlushed);
+  status_cb.Run(::media::PIPELINE_OK);
+}
+
+void AudioPipelineImpl::Stop() {
+  CMALOG(kLogControl) << "AudioPipelineImpl::Stop";
+  av_pipeline_impl_->Stop();
+  av_pipeline_impl_->TransitionToState(AvPipelineImpl::kStopped);
+}
+
+void AudioPipelineImpl::SetCdm(BrowserCdmCast* media_keys) {
+  av_pipeline_impl_->SetCdm(media_keys);
+}
+
+void AudioPipelineImpl::Initialize(
+    const ::media::AudioDecoderConfig& audio_config,
+    scoped_ptr<CodedFrameProvider> frame_provider,
+    const ::media::PipelineStatusCB& status_cb) {
+  CMALOG(kLogControl) << "AudioPipelineImpl::Initialize "
+                      << audio_config.AsHumanReadableString();
+  if (frame_provider)
+    SetCodedFrameProvider(frame_provider.Pass());
+
+  if (!audio_device_->SetConfig(audio_config) ||
+      !av_pipeline_impl_->Initialize()) {
+    status_cb.Run(::media::PIPELINE_ERROR_INITIALIZATION_FAILED);
+    return;
+  }
+  av_pipeline_impl_->TransitionToState(AvPipelineImpl::kFlushed);
+  status_cb.Run(::media::PIPELINE_OK);
+}
+
+void AudioPipelineImpl::SetVolume(float volume) {
+  audio_device_->SetStreamVolumeMultiplier(volume);
+}
+
+void AudioPipelineImpl::OnUpdateConfig(
+    const ::media::AudioDecoderConfig& audio_config,
+    const ::media::VideoDecoderConfig& video_config) {
+  if (audio_config.IsValidConfig()) {
+    CMALOG(kLogControl) << "AudioPipelineImpl::OnUpdateConfig "
+                        << audio_config.AsHumanReadableString();
+
+    bool success = audio_device_->SetConfig(audio_config);
+    if (!success && !audio_client_.playback_error_cb.is_null())
+      audio_client_.playback_error_cb.Run(::media::PIPELINE_ERROR_DECODE);
+  }
+}
+
+void AudioPipelineImpl::UpdateStatistics() {
+  if (audio_client_.statistics_cb.is_null())
+    return;
+
+  MediaComponentDevice::Statistics device_stats;
+  if (!audio_device_->GetStatistics(&device_stats))
+    return;
+
+  ::media::PipelineStatistics current_stats;
+  current_stats.audio_bytes_decoded = device_stats.decoded_bytes;
+
+  ::media::PipelineStatistics delta_stats;
+  delta_stats.audio_bytes_decoded =
+      current_stats.audio_bytes_decoded - previous_stats_.audio_bytes_decoded;
+
+  previous_stats_ = current_stats;
+
+  audio_client_.statistics_cb.Run(delta_stats);
+}
+
+}  // namespace media
+}  // namespace chromecast