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/*
* Copyright (c) 2018 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.
*/
#ifndef VIDEO_VIDEO_STREAM_DECODER_IMPL_H_
#define VIDEO_VIDEO_STREAM_DECODER_IMPL_H_
#include <map>
#include <memory>
#include <utility>
#include "absl/types/optional.h"
#include "api/video/video_stream_decoder.h"
#include "modules/video_coding/frame_buffer2.h"
#include "modules/video_coding/timing.h"
#include "rtc_base/platform_thread.h"
#include "rtc_base/synchronization/mutex.h"
#include "rtc_base/task_queue.h"
#include "rtc_base/thread_checker.h"
#include "system_wrappers/include/clock.h"
namespace webrtc {
class VideoStreamDecoderImpl : public VideoStreamDecoderInterface {
public:
VideoStreamDecoderImpl(
VideoStreamDecoderInterface::Callbacks* callbacks,
VideoDecoderFactory* decoder_factory,
TaskQueueFactory* task_queue_factory,
std::map<int, std::pair<SdpVideoFormat, int>> decoder_settings);
~VideoStreamDecoderImpl() override;
void OnFrame(std::unique_ptr<video_coding::EncodedFrame> frame) override;
void SetMinPlayoutDelay(TimeDelta min_delay) override;
void SetMaxPlayoutDelay(TimeDelta max_delay) override;
private:
class DecodeCallbacks : public DecodedImageCallback {
public:
explicit DecodeCallbacks(VideoStreamDecoderImpl* video_stream_decoder_impl);
int32_t Decoded(VideoFrame& decodedImage) override;
int32_t Decoded(VideoFrame& decodedImage, int64_t decode_time_ms) override;
void Decoded(VideoFrame& decodedImage,
absl::optional<int32_t> decode_time_ms,
absl::optional<uint8_t> qp) override;
private:
VideoStreamDecoderImpl* const video_stream_decoder_impl_;
};
enum DecodeResult {
kOk,
kOkRequestKeyframe,
kDecodeFailure,
};
struct FrameTimestamps {
int64_t timestamp;
int64_t decode_start_time_ms;
int64_t render_time_us;
};
void SaveFrameTimestamps(const video_coding::EncodedFrame& frame)
RTC_RUN_ON(bookkeeping_queue_);
FrameTimestamps* GetFrameTimestamps(int64_t timestamp)
RTC_RUN_ON(bookkeeping_queue_);
void StartNextDecode() RTC_RUN_ON(bookkeeping_queue_);
void OnNextFrameCallback(std::unique_ptr<video_coding::EncodedFrame> frame,
video_coding::FrameBuffer::ReturnReason res)
RTC_RUN_ON(bookkeeping_queue_);
void OnDecodedFrameCallback(VideoFrame& decodedImage, // NOLINT
absl::optional<int32_t> decode_time_ms,
absl::optional<uint8_t> qp);
VideoDecoder* GetDecoder(int payload_type) RTC_RUN_ON(decode_queue_);
VideoStreamDecoderImpl::DecodeResult DecodeFrame(
std::unique_ptr<video_coding::EncodedFrame> frame)
RTC_RUN_ON(decode_queue_);
VCMTiming timing_;
DecodeCallbacks decode_callbacks_;
// Some decoders are pipelined so it is not sufficient to save frame info
// for the last frame only.
static constexpr int kFrameTimestampsMemory = 8;
std::array<FrameTimestamps, kFrameTimestampsMemory> frame_timestamps_
RTC_GUARDED_BY(bookkeeping_queue_);
int next_frame_timestamps_index_ RTC_GUARDED_BY(bookkeeping_queue_);
VideoStreamDecoderInterface::Callbacks* const callbacks_
RTC_PT_GUARDED_BY(bookkeeping_queue_);
video_coding::VideoLayerFrameId last_continuous_id_
RTC_GUARDED_BY(bookkeeping_queue_);
bool keyframe_required_ RTC_GUARDED_BY(bookkeeping_queue_);
absl::optional<int> current_payload_type_ RTC_GUARDED_BY(decode_queue_);
VideoDecoderFactory* const decoder_factory_ RTC_PT_GUARDED_BY(decode_queue_);
std::map<int, std::pair<SdpVideoFormat, int>> decoder_settings_
RTC_GUARDED_BY(decode_queue_);
// The |bookkeeping_queue_| use the |frame_buffer_| and also posts tasks to
// the |decode_queue_|. The |decode_queue_| in turn use the |decoder_| to
// decode frames. When the |decoder_| is done it will post back to the
// |bookkeeping_queue_| with the decoded frame. During shutdown we start by
// isolating the |bookkeeping_queue_| from the |decode_queue_|, so now it's
// safe for the |decode_queue_| to be destructed. After that the |decoder_|
// can be destructed, and then the |bookkeeping_queue_|. Finally the
// |frame_buffer_| can be destructed.
Mutex shut_down_mutex_;
bool shut_down_ RTC_GUARDED_BY(shut_down_mutex_);
video_coding::FrameBuffer frame_buffer_ RTC_GUARDED_BY(bookkeeping_queue_);
rtc::TaskQueue bookkeeping_queue_;
std::unique_ptr<VideoDecoder> decoder_ RTC_GUARDED_BY(decode_queue_);
rtc::TaskQueue decode_queue_;
};
} // namespace webrtc
#endif // VIDEO_VIDEO_STREAM_DECODER_IMPL_H_
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