chromium/src/third_party/blink/renderer/platform/mediastream/media_stream_web_audio_source.cc

/*
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#include <memory>
#include "third_party/blink/public/platform/web_audio_source_provider.h"
#include "third_party/blink/renderer/platform/audio/audio_bus.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_web_audio_source.h"

namespace blink {

MediaStreamWebAudioSource::MediaStreamWebAudioSource(
    std::unique_ptr<WebAudioSourceProvider> provider)
    : web_audio_source_provider_(std::move(provider)) {}

MediaStreamWebAudioSource::~MediaStreamWebAudioSource() = default;

void MediaStreamWebAudioSource::ProvideInput(AudioBus* bus,
                                             uint32_t frames_to_process) {
  DCHECK(bus);
  if (!bus)
    return;

  if (!web_audio_source_provider_) {
    bus->Zero();
    return;
  }

  // Wrap the AudioBus channel data using WebVector.
  uint32_t n = bus->NumberOfChannels();
  if (web_audio_data_.size() != n)
    web_audio_data_ = WebVector<float*>(static_cast<size_t>(n));

  for (uint32_t i = 0; i < n; ++i)
    web_audio_data_[i] = bus->Channel(i)->MutableData();

  web_audio_source_provider_->ProvideInput(web_audio_data_, frames_to_process);
}

}  // namespace blink