chromium/third_party/blink/renderer/modules/mediacapturefromelement/html_media_element_capture.cc

// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/modules/mediacapturefromelement/html_media_element_capture.h"

#include "base/memory/ptr_util.h"
#include "base/task/single_thread_task_runner.h"
#include "third_party/abseil-cpp/absl/types/variant.h"
#include "third_party/blink/public/mojom/mediastream/media_devices.mojom-blink.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/task_type.h"
#include "third_party/blink/public/web/modules/mediastream/media_stream_video_source.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_binding_for_core.h"
#include "third_party/blink/renderer/core/dom/events/native_event_listener.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/html/media/html_media_element.h"
#include "third_party/blink/renderer/core/html/track/audio_track_list.h"
#include "third_party/blink/renderer/core/html/track/video_track_list.h"
#include "third_party/blink/renderer/modules/encryptedmedia/html_media_element_encrypted_media.h"
#include "third_party/blink/renderer/modules/encryptedmedia/media_keys.h"
#include "third_party/blink/renderer/modules/mediacapturefromelement/html_audio_element_capturer_source.h"
#include "third_party/blink/renderer/modules/mediacapturefromelement/html_video_element_capturer_source.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_constraints_util.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_utils.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_video_capturer_source.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_video_track.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_audio_source.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_audio_track.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_component_impl.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_descriptor.h"
#include "third_party/blink/renderer/platform/mediastream/media_stream_source.h"
#include "third_party/blink/renderer/platform/wtf/uuid.h"

namespace blink {

namespace {

// This method creates a MediaStreamSource with the provided video
// capturer source. A new MediaStreamComponent + MediaStreamTrack pair is
// created, connected to the source and is plugged into the
// MediaStreamDescriptor (|descriptor|).
// |is_remote| should be true if the source of the data is not a local device.
// |is_readonly| should be true if the format of the data cannot be changed by
// MediaTrackConstraints.
bool AddVideoTrackToMediaStream(
    LocalFrame* frame,
    std::unique_ptr<VideoCapturerSource> video_source,
    bool is_remote,
    MediaStreamDescriptor* descriptor) { … }

// Fills in the MediaStreamDescriptor to capture from the WebMediaPlayer
// identified by the second parameter.
void CreateHTMLVideoElementCapturer(
    LocalFrame* frame,
    MediaStreamDescriptor* descriptor,
    WebMediaPlayer* web_media_player,
    scoped_refptr<base::SingleThreadTaskRunner> task_runner) { … }

// Fills in the MediaStreamDescriptor to capture from the WebMediaPlayer
// identified by the second parameter.
void CreateHTMLAudioElementCapturer(
    LocalFrame*,
    MediaStreamDescriptor* descriptor,
    WebMediaPlayer* web_media_player,
    scoped_refptr<base::SingleThreadTaskRunner> task_runner) { … }

// Class to register to the events of |m_mediaElement|, acting accordingly on
// the tracks of |m_mediaStream|.
class MediaElementEventListener final : public NativeEventListener { … };

MediaElementEventListener::MediaElementEventListener(HTMLMediaElement* element,
                                                     MediaStream* stream)
    : … { … }

void MediaElementEventListener::Invoke(ExecutionContext* context,
                                       Event* event) { … }

void DidStopMediaStreamSource(MediaStreamSource* source) { … }

void MediaElementEventListener::UpdateSources(ExecutionContext* context) { … }

void MediaElementEventListener::Trace(Visitor* visitor) const { … }

}  // anonymous namespace

// static
MediaStream* HTMLMediaElementCapture::captureStream(
    ScriptState* script_state,
    HTMLMediaElement& element,
    ExceptionState& exception_state) { … }

}  // namespace blink