Motown in-proc streaming framework used to implement media services.

services/media/framework/stages/stage.cc

Index: services/media/framework/stages/stage.cc
diff --git a/services/media/framework/stages/stage.cc b/services/media/framework/stages/stage.cc
new file mode 100644
index 0000000000000000000000000000000000000000..569072593dbde933eacd4b89cfb4c9b95ea48f9f
--- /dev/null
+++ b/services/media/framework/stages/stage.cc
@@ -0,0 +1,117 @@
+// Copyright 2016 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 "services/media/framework/stages/stage.h"
+
+namespace mojo {
+namespace media {
+
+Stage::Stage() {}
+
+Stage::~Stage() {}
+
+bool Stage::Prepare(UpdateCallback update_callback) {
+  return false;
+}
+
+void Stage::Prime() {}
+
+uint32_t SourceStage::input_count() const {
+  return 0;
+};
+
+StageInput& SourceStage::input(uint32_t index) {
+  NOTREACHED();
+  static StageInput result;
+  return result;
+}
+
+uint32_t SinkStage::output_count() const {
+  return 0;
+}
+
+StageOutput& SinkStage::output(uint32_t index) {
+  NOTREACHED();
+  static StageOutput result;
+  return result;
+}
+
+uint32_t SingleInputStage::input_count() const {
+  return 1;
+};
+
+StageInput& SingleInputStage::input(uint32_t index) {
+  DCHECK_EQ(index, 0u);
+  return input_;
+}
+
+uint32_t SingleOutputStage::output_count() const {
+  return 1;
+}
+
+StageOutput& SingleOutputStage::output(uint32_t index) {
+  DCHECK_EQ(index, 0u);
+  return output_;
+}
+
+MultiInputStage::MultiInputStage() {}
+
+MultiInputStage::~MultiInputStage() {}
+
+uint32_t MultiInputStage::input_count() const {
+  return inputs_.size();
+};
+
+StageInput& MultiInputStage::input(uint32_t index) {
+  DCHECK(index < inputs_.size());
+  return inputs_[index];
+}
+
+MultiOutputStage::MultiOutputStage() {}
+
+MultiOutputStage::~MultiOutputStage() {}
+
+uint32_t MultiOutputStage::output_count() const {
+  return outputs_.size();
+}
+
+StageOutput& MultiOutputStage::output(uint32_t index) {
+  DCHECK(index < outputs_.size());
+  return outputs_[index];
+}
+
+uint32_t LpcmSingleInputStage::input_count() const {
+  return 1;
+};
+
+StageInput& LpcmSingleInputStage::input(uint32_t index) {
+  DCHECK_EQ(index, 0u);
+  return input_;
+}
+
+LpcmMultiInputStage::LpcmMultiInputStage() {}
+
+LpcmMultiInputStage::~LpcmMultiInputStage() {}
+
+uint32_t LpcmMultiInputStage::input_count() const {
+  return inputs_.size();
+};
+
+StageInput& LpcmMultiInputStage::input(uint32_t index) {
+  DCHECK(index < inputs_.size());
+  return inputs_[index];
+}
+
+uint32_t LpcmSingleOutputStage::output_count() const {
+  return 1;
+}
+
+StageOutput& LpcmSingleOutputStage::output(uint32_t index) {
+  DCHECK_EQ(index, 0u);
+  return output_;
+}
+
+}  // namespace media
+}  // namespace mojo