third_party/WebKit/Source/platform/mediastream/MediaStreamComponent.cpp

/*
 * Copyright (C) 2011 Ericsson AB. All rights reserved.
 * Copyright (C) 2013 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:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * 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
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#include "platform/mediastream/MediaStreamComponent.h"

#include "platform/UUID.h"
#include "platform/audio/AudioBus.h"
#include "platform/mediastream/MediaStreamCenter.h"
#include "platform/mediastream/MediaStreamSource.h"
#include "public/platform/WebAudioSourceProvider.h"
#include "public/platform/WebMediaStreamTrack.h"

namespace blink {

MediaStreamComponent* MediaStreamComponent::Create(MediaStreamSource* source) {
  return new MediaStreamComponent(CreateCanonicalUUIDString(), source);
}

MediaStreamComponent* MediaStreamComponent::Create(const String& id,
                                                   MediaStreamSource* source) {
  return new MediaStreamComponent(id, source);
}

MediaStreamComponent::MediaStreamComponent(const String& id,
                                           MediaStreamSource* source)
    : MediaStreamComponent(id,
                           source,
                           true,
                           false,
                           WebMediaStreamTrack::ContentHintType::kNone) {}

MediaStreamComponent::MediaStreamComponent(
    const String& id,
    MediaStreamSource* source,
    bool enabled,
    bool muted,
    WebMediaStreamTrack::ContentHintType content_hint)
    : source_(source),
      id_(id),
      enabled_(enabled),
      muted_(muted),
      content_hint_(content_hint) {
  DCHECK(id_.length());
}

MediaStreamComponent* MediaStreamComponent::Clone() const {
  MediaStreamComponent* cloned_component = new MediaStreamComponent(
      CreateCanonicalUUIDString(), Source(), enabled_, muted_, content_hint_);
  // TODO(pbos): Clone |m_trackData| as well.
  // TODO(pbos): Move properties from MediaStreamTrack here so that they are
  // also cloned. Part of crbug:669212 since stopped is currently not carried
  // over, nor is ended().
  return cloned_component;
}

void MediaStreamComponent::Dispose() {
  track_data_.reset();
}

void MediaStreamComponent::AudioSourceProviderImpl::Wrap(
    WebAudioSourceProvider* provider) {
  MutexLocker locker(provide_input_lock_);
  web_audio_source_provider_ = provider;
}

void MediaStreamComponent::GetSettings(
    WebMediaStreamTrack::Settings& settings) {
  DCHECK(track_data_);
  source_->GetSettings(settings);
  track_data_->GetSettings(settings);
}

void MediaStreamComponent::SetContentHint(
    WebMediaStreamTrack::ContentHintType hint) {
  switch (hint) {
    case WebMediaStreamTrack::ContentHintType::kNone:
      break;
    case WebMediaStreamTrack::ContentHintType::kAudioSpeech:
    case WebMediaStreamTrack::ContentHintType::kAudioMusic:
      DCHECK_EQ(MediaStreamSource::kTypeAudio, Source()->GetType());
      break;
    case WebMediaStreamTrack::ContentHintType::kVideoMotion:
    case WebMediaStreamTrack::ContentHintType::kVideoDetail:
      DCHECK_EQ(MediaStreamSource::kTypeVideo, Source()->GetType());
      break;
  }
  if (hint == content_hint_)
    return;
  content_hint_ = hint;

  MediaStreamCenter::Instance().DidSetContentHint(this);
}

void MediaStreamComponent::AudioSourceProviderImpl::ProvideInput(
    AudioBus* bus,
    size_t frames_to_process) {
  DCHECK(bus);
  if (!bus)
    return;

  MutexTryLocker try_locker(provide_input_lock_);
  if (!try_locker.Locked() || !web_audio_source_provider_) {
    bus->Zero();
    return;
  }

  // Wrap the AudioBus channel data using WebVector.
  size_t n = bus->NumberOfChannels();
  WebVector<float*> web_audio_data(n);
  for (size_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);
}

DEFINE_TRACE(MediaStreamComponent) {
  visitor->Trace(source_);
}

}  // namespace blink