Revert of [Chromecast] Process streams with different post-processing.

chromecast/media/cma/backend/alsa/filter_group.h

Index: chromecast/media/cma/backend/alsa/filter_group.h
diff --git a/chromecast/media/cma/backend/alsa/filter_group.h b/chromecast/media/cma/backend/alsa/filter_group.h
deleted file mode 100644
index dddbf83e418b0db4468b87a7d6aebf45f24bbca6..0000000000000000000000000000000000000000
--- a/chromecast/media/cma/backend/alsa/filter_group.h
+++ /dev/null
@@ -1,87 +0,0 @@
-// Copyright 2017 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 CHROMECAST_MEDIA_CMA_BACKEND_ALSA_FILTER_GROUP_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_ALSA_FILTER_GROUP_H_
-
-#include <stdint.h>
-
-#include <memory>
-#include <string>
-#include <unordered_set>
-#include <vector>
-
-#include "base/macros.h"
-#include "chromecast/media/cma/backend/alsa/audio_filter_factory.h"
-#include "chromecast/media/cma/backend/alsa/stream_mixer_alsa.h"
-
-namespace chromecast {
-namespace media {
-class AudioBus;
-
-// FilterGroup contains state for an AudioFilter.
-// It takes multiple StreamMixerAlsa::InputQueues,
-// mixes them, and processes them.
-
-// ActiveInputs are added with AddActiveInput(), then cleared when
-// MixAndFilter() is called (they must be added each time data is queried).
-class FilterGroup {
- public:
-  // |input_types| is a set of strings that is used as a filter to determine
-  // if an input belongs to this group (InputQueue->name() must exactly match an
-  // entry in |input_types| to be processed by this group.
-  // |filter_type| is passed to AudioFilterFactory to create an AudioFilter.
-  FilterGroup(const std::unordered_set<std::string>& input_types,
-              AudioFilterFactory::FilterType filter_type);
-  ~FilterGroup();
-
-  // Sets the sample rate and format in the AudioFilter.
-  void Initialize(int output_samples_per_second, ::media::SampleFormat format);
-
-  // Returns |true| if this FilterGroup is appropriate to process |input|.
-  bool CanProcessInput(StreamMixerAlsa::InputQueue* input);
-
-  // Adds |input| to |active_inputs_|.
-  void AddActiveInput(StreamMixerAlsa::InputQueue* input);
-
-  // Retrieves a pointer to the output buffer |interleaved_|.
-  std::vector<uint8_t>* GetInterleaved();
-
-  // Mixes all active inputs and passes them through the audio filter.
-  bool MixAndFilter(int chunk_size);
-
-  // Overwrites |interleaved_| with 0's, ensuring at least
-  // |chunk_size| bytes.
-  void ClearInterleaved(int chunk_size);
-
-  // Clear all |active_inputs_|. This should be called before AddActiveInputs
-  // on each mixing iteration.
-  void ClearActiveInputs();
-
- private:
-  void ResizeBuffersIfNecessary(int chunk_size);
-  int BytesPerOutputFormatSample();
-
-  const std::unordered_set<std::string> input_types_;
-  std::vector<StreamMixerAlsa::InputQueue*> active_inputs_;
-
-  int output_samples_per_second_;
-  ::media::SampleFormat sample_format_;
-
-  // Buffers that hold audio data while it is mixed.
-  // These are kept as members of this class to minimize copies and
-  // allocations.
-  std::unique_ptr<::media::AudioBus> temp_;
-  std::unique_ptr<::media::AudioBus> mixed_;
-  std::vector<uint8_t> interleaved_;
-
-  std::unique_ptr<AudioFilterInterface> audio_filter_;
-  int silence_frames_filtered_;
-
-  DISALLOW_COPY_AND_ASSIGN(FilterGroup);
-};
-
-}  // namespace media
-}  // namespace chromecast
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_ALSA_FILTER_GROUP_H_