Rename AudioRendererBase and AudioRendererAlgorithmBase

media/filters/audio_renderer_algorithm_base.h

Index: media/filters/audio_renderer_algorithm_base.h
diff --git a/media/filters/audio_renderer_algorithm_base.h b/media/filters/audio_renderer_algorithm_base.h
deleted file mode 100644
index 0e5083e65af32d690081365338a6c163fcd9e355..0000000000000000000000000000000000000000
--- a/media/filters/audio_renderer_algorithm_base.h
+++ /dev/null
@@ -1,203 +0,0 @@
-// 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.
-
-// AudioRendererAlgorithmBase buffers and transforms audio data. The owner of
-// this object provides audio data to the object through EnqueueBuffer() and
-// requests data from the buffer via FillBuffer(). The owner also sets the
-// playback rate, and the AudioRendererAlgorithm will stretch or compress the
-// buffered audio as necessary to match the playback rate when fulfilling
-// FillBuffer() requests. AudioRendererAlgorithm can request more data to be
-// buffered via a read callback passed in during initialization.
-//
-// This class is *not* thread-safe. Calls to enqueue and retrieve data must be
-// locked if called from multiple threads.
-//
-// AudioRendererAlgorithmBase uses a simple pitch-preservation algorithm to
-// stretch and compress audio data to meet playback speeds less than and
-// greater than the natural playback of the audio stream.
-//
-// Audio at very low or very high playback rates are muted to preserve quality.
-
-#ifndef MEDIA_FILTERS_AUDIO_RENDERER_ALGORITHM_BASE_H_
-#define MEDIA_FILTERS_AUDIO_RENDERER_ALGORITHM_BASE_H_
-
-#include "base/callback.h"
-#include "base/gtest_prod_util.h"
-#include "media/base/seekable_buffer.h"
-
-namespace media {
-
-class Buffer;
-
-class MEDIA_EXPORT AudioRendererAlgorithmBase {
- public:
-  AudioRendererAlgorithmBase();
-  ~AudioRendererAlgorithmBase();
-
-  // Call prior to Initialize() to validate configuration.  Returns false if the
-  // configuration is invalid.  Detailed error information will be DVLOG'd.
-  static bool ValidateConfig(int channels,
-                             int samples_per_second,
-                             int bits_per_channel);
-
-  // Initializes this object with information about the audio stream.
-  // |samples_per_second| is in Hz. |read_request_callback| is called to
-  // request more data from the client, requests that are fulfilled through
-  // calls to EnqueueBuffer().
-  void Initialize(int channels,
-                  int samples_per_second,
-                  int bits_per_channel,
-                  float initial_playback_rate,
-                  const base::Closure& request_read_cb);
-
-  // Tries to fill |requested_frames| frames into |dest| with possibly scaled
-  // data from our |audio_buffer_|. Data is scaled based on the playback rate,
-  // using a variation of the Overlap-Add method to combine sample windows.
-  //
-  // Data from |audio_buffer_| is consumed in proportion to the playback rate.
-  //
-  // Returns the number of frames copied into |dest|.
-  // May request more reads via |request_read_cb_| before returning.
-  int FillBuffer(uint8* dest, int requested_frames);
-
-  // Clears |audio_buffer_|.
-  void FlushBuffers();
-
-  // Returns the time of the next byte in our data or kNoTimestamp() if current
-  // time is unknown.
-  base::TimeDelta GetTime();
-
-  // Enqueues a buffer. It is called from the owner of the algorithm after a
-  // read completes.
-  void EnqueueBuffer(Buffer* buffer_in);
-
-  float playback_rate() const { return playback_rate_; }
-  void SetPlaybackRate(float new_rate);
-
-  // Returns whether the algorithm needs more data to continue filling buffers.
-  bool NeedsMoreData();
-
-  // Returns true if |audio_buffer_| is at or exceeds capacity.
-  bool IsQueueFull();
-
-  // Returns the capacity of |audio_buffer_|.
-  int QueueCapacity();
-
-  // Increase the capacity of |audio_buffer_| if possible.
-  void IncreaseQueueCapacity();
-
-  // Returns the number of bytes left in |audio_buffer_|, which may be larger
-  // than QueueCapacity() in the event that a read callback delivered more data
-  // than |audio_buffer_| was intending to hold.
-  int bytes_buffered() { return audio_buffer_.forward_bytes(); }
-
-  int bytes_per_frame() { return bytes_per_frame_; }
-
-  int bytes_per_channel() { return bytes_per_channel_; }
-
-  bool is_muted() { return muted_; }
-
- private:
-  // Returns true if |audio_buffer_| is empty.
-  bool IsQueueEmpty();
-
-  // Fills |dest| with one frame of audio data at normal speed. Returns true if
-  // a frame was rendered, false otherwise.
-  bool OutputNormalPlayback(uint8* dest);
-
-  // Fills |dest| with one frame of audio data at faster than normal speed.
-  // Returns true if a frame was rendered, false otherwise.
-  //
-  // When the audio playback is > 1.0, we use a variant of Overlap-Add to squish
-  // audio output while preserving pitch. Essentially, we play a bit of audio
-  // data at normal speed, then we "fast forward" by dropping the next bit of
-  // audio data, and then we stich the pieces together by crossfading from one
-  // audio chunk to the next.
-  bool OutputFasterPlayback(uint8* dest);
-
-  // Fills |dest| with one frame of audio data at slower than normal speed.
-  // Returns true if a frame was rendered, false otherwise.
-  //
-  // When the audio playback is < 1.0, we use a variant of Overlap-Add to
-  // stretch audio output while preserving pitch. This works by outputting a
-  // segment of audio data at normal speed. The next audio segment then starts
-  // by repeating some of the audio data from the previous audio segment.
-  // Segments are stiched together by crossfading from one audio chunk to the
-  // next.
-  bool OutputSlowerPlayback(uint8* dest);
-
-  // Resets the window state to the start of a new window.
-  void ResetWindow();
-
-  // Copies a raw frame from |audio_buffer_| into |dest| without progressing
-  // |audio_buffer_|'s internal "current" cursor. Optionally peeks at a forward
-  // byte |offset|.
-  void CopyWithoutAdvance(uint8* dest);
-  void CopyWithoutAdvance(uint8* dest, int offset);
-
-  // Copies a raw frame from |audio_buffer_| into |dest| and progresses the
-  // |audio_buffer_| forward.
-  void CopyWithAdvance(uint8* dest);
-
-  // Moves the |audio_buffer_| forward by one frame.
-  void DropFrame();
-
-  // Does a linear crossfade from |intro| into |outtro| for one frame.
-  // Assumes pointers are valid and are at least size of |bytes_per_frame_|.
-  void OutputCrossfadedFrame(uint8* outtro, const uint8* intro);
-  template <class Type>
-  void CrossfadeFrame(uint8* outtro, const uint8* intro);
-
-  // Rounds |*value| down to the nearest frame boundary.
-  void AlignToFrameBoundary(int* value);
-
-  // Number of channels in audio stream.
-  int channels_;
-
-  // Sample rate of audio stream.
-  int samples_per_second_;
-
-  // Byte depth of audio.
-  int bytes_per_channel_;
-
-  // Used by algorithm to scale output.
-  float playback_rate_;
-
-  // Used to request more data.
-  base::Closure request_read_cb_;
-
-  // Buffered audio data.
-  SeekableBuffer audio_buffer_;
-
-  // Length for crossfade in bytes.
-  int bytes_in_crossfade_;
-
-  // Length of frame in bytes.
-  int bytes_per_frame_;
-
-  // The current location in the audio window, between 0 and |window_size_|.
-  // When |index_into_window_| reaches |window_size_|, the window resets.
-  // Indexed by byte.
-  int index_into_window_;
-
-  // The frame number in the crossfade.
-  int crossfade_frame_number_;
-
-  // True if the audio should be muted.
-  bool muted_;
-
-  bool needs_more_data_;
-
-  // Temporary buffer to hold crossfade data.
-  scoped_array<uint8> crossfade_buffer_;
-
-  // Window size, in bytes (calculated from audio properties).
-  int window_size_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioRendererAlgorithmBase);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_FILTERS_AUDIO_RENDERER_ALGORITHM_BASE_H_