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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include "webrtc/api/mediastreaminterface.h"
#include "webrtc/api/notifier.h"
#include "webrtc/media/base/videoadapter.h"
#include "webrtc/media/base/videobroadcaster.h"
namespace rtc {
// Base class for sources which needs video adaptation, e.g., video
// capture sources. Sinks must be added and removed on one and only
// one thread, while AdaptFrame and OnFrame may be called on any
// thread.
class AdaptedVideoTrackSource
: public webrtc::Notifier<webrtc::VideoTrackSourceInterface> {
// Allows derived classes to initialize |video_adapter_| with a custom
// alignment.
AdaptedVideoTrackSource(int required_alignment);
// Checks the apply_rotation() flag. If the frame needs rotation, and it is a
// plain memory frame, it is rotated. Subclasses producing native frames must
// handle apply_rotation() themselves.
void OnFrame(const webrtc::VideoFrame& frame);
// Reports the appropriate frame size after adaptation. Returns true
// if a frame is wanted. Returns false if there are no interested
// sinks, or if the VideoAdapter decides to drop the frame.
bool AdaptFrame(int width,
int height,
int64_t time_us,
int* out_width,
int* out_height,
int* crop_width,
int* crop_height,
int* crop_x,
int* crop_y);
// Returns the current value of the apply_rotation flag, derived
// from the VideoSinkWants of registered sinks. The value is derived
// from sinks' wants, in AddOrUpdateSink and RemoveSink. Beware that
// when using this method from a different thread, the value may
// become stale before it is used.
bool apply_rotation();
cricket::VideoAdapter* video_adapter() { return &video_adapter_; }
// Implements rtc::VideoSourceInterface.
void AddOrUpdateSink(rtc::VideoSinkInterface<webrtc::VideoFrame>* sink,
const rtc::VideoSinkWants& wants) override;
void RemoveSink(rtc::VideoSinkInterface<webrtc::VideoFrame>* sink) override;
// Part of VideoTrackSourceInterface.
bool GetStats(Stats* stats) override;
void OnSinkWantsChanged(const rtc::VideoSinkWants& wants);
rtc::ThreadChecker thread_checker_;
cricket::VideoAdapter video_adapter_;
rtc::CriticalSection stats_crit_;
rtc::Optional<Stats> stats_ GUARDED_BY(stats_crit_);
VideoBroadcaster broadcaster_;
} // namespace rtc