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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_CAPTURE_VIDEO_VIDEO_FRAME_RECEIVER_H_
#define MEDIA_CAPTURE_VIDEO_VIDEO_FRAME_RECEIVER_H_
#include "media/capture/capture_export.h"
#include "media/capture/mojom/video_capture_types.mojom.h"
#include "media/capture/video/video_capture_buffer_handle.h"
#include "media/capture/video/video_capture_device.h"
namespace media {
// Callback interface for VideoCaptureDeviceClient to communicate with its
// clients. On some platforms, VideoCaptureDeviceClient calls these methods from
// OS or capture driver provided threads which do not have a task runner and
// cannot be posted back to. The mostly equivalent interface
// video_capture::mojom::VideoFrameHandler cannot be used by
// VideoCaptureDeviceClient directly, because creating a
// video_catpure::mojom::ScopedAccessPermission for passing into
// OnFrameReadyInBuffer() requires a thread with a task runner.
class CAPTURE_EXPORT VideoFrameReceiver {
public:
virtual ~VideoFrameReceiver() {}
// Tells the VideoFrameReceiver that the producer is going to subsequently use
// the provided buffer as one of possibly many for frame delivery via
// OnFrameReadyInBuffer(). Note, that a call to this method does not mean that
// the caller allows the receiver to read from or write to the buffer just
// yet. Temporary permission to read will be given with subsequent calls to
// OnFrameReadyInBuffer().
virtual void OnNewBuffer(
int32_t buffer_id,
media::mojom::VideoBufferHandlePtr buffer_handle) = 0;
// Tells the VideoFrameReceiver that a new frame is ready for consumption
// in the buffer with id |buffer_id| and allows it to read the data from
// the buffer. The producer guarantees that the buffer and its contents stay
// alive and unchanged until VideoFrameReceiver releases the given
// |buffer_read_permission|.
virtual void OnFrameReadyInBuffer(
int buffer_id,
int frame_feedback_id,
std::unique_ptr<
VideoCaptureDevice::Client::Buffer::ScopedAccessPermission>
buffer_read_permission,
mojom::VideoFrameInfoPtr frame_info) = 0;
// Tells the VideoFrameReceiver that the producer is no longer going to use
// the buffer with id |buffer_id| for frame delivery. This may be called even
// while the receiver is still holding |buffer_read_permission| from a call to
// OnFrameReadInBuffer() for the same buffer. In that case, it means that the
// caller is asking the VideoFrameReceiver to release the read permission and
// buffer handle at its earliest convenience. After this call, a producer may
// immediately reuse the retired |buffer_id| with a new buffer via a call to
// OnNewBuffer().
virtual void OnBufferRetired(int buffer_id) = 0;
virtual void OnError(VideoCaptureError error) = 0;
virtual void OnFrameDropped(VideoCaptureFrameDropReason reason) = 0;
virtual void OnLog(const std::string& message) = 0;
virtual void OnStarted() = 0;
virtual void OnStartedUsingGpuDecode() = 0;
virtual void OnStopped() = 0;
};
} // namespace media
#endif // MEDIA_CAPTURE_VIDEO_VIDEO_FRAME_RECEIVER_H_
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