/*
 * Copyright 2014 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Ericsson nor the names of its contributors
 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_MEDIA_STREAM_WEB_AUDIO_SOURCE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_MEDIA_STREAM_WEB_AUDIO_SOURCE_H_

#include <memory>
#include <utility>
#include <vector>

#include "base/containers/span.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr_exclusion.h"
#include "third_party/blink/renderer/platform/allow_discouraged_type.h"
#include "third_party/blink/renderer/platform/audio/audio_source_provider.h"
#include "third_party/blink/renderer/platform/platform_export.h"

namespace blink {

class WebAudioSourceProvider;

class PLATFORM_EXPORT MediaStreamWebAudioSource final
    : public AudioSourceProvider {
 public:
  explicit MediaStreamWebAudioSource(std::unique_ptr<WebAudioSourceProvider>);
  MediaStreamWebAudioSource(const MediaStreamWebAudioSource&) = delete;
  MediaStreamWebAudioSource& operator=(const MediaStreamWebAudioSource&) =
      delete;
  ~MediaStreamWebAudioSource() override;

 private:
  // blink::AudioSourceProvider implementation.
  void ProvideInput(AudioBus*, int frames_to_process) override;
  void SetClient(AudioSourceProviderClient*) override {}

  std::unique_ptr<WebAudioSourceProvider> web_audio_source_provider_;

  // Re-allocate only when the channel count changes to avoid heap
  // allocations on the real-time audio thread.
  RAW_PTR_EXCLUSION std::vector<base::span<float>> web_audio_data_
      ALLOW_DISCOURAGED_TYPE("Matches WebAudioSourceProvider::ProvideInput");
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MEDIASTREAM_MEDIA_STREAM_WEB_AUDIO_SOURCE_H_