blob: 48733ecca443992e9fdcb04e963b574b012c6804 [file] [log] [blame]
/*
* 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.
*/
#include "video/video_stream_decoder_impl.h"
#include "absl/memory/memory.h"
#include "api/task_queue/queued_task.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/mod_ops.h"
#include "rtc_base/time_utils.h"
namespace webrtc {
VideoStreamDecoderImpl::VideoStreamDecoderImpl(
VideoStreamDecoderInterface::Callbacks* callbacks,
VideoDecoderFactory* decoder_factory,
TaskQueueFactory* task_queue_factory,
std::map<int, std::pair<SdpVideoFormat, int>> decoder_settings)
: callbacks_(callbacks),
decoder_factory_(decoder_factory),
decoder_settings_(std::move(decoder_settings)),
bookkeeping_queue_(task_queue_factory->CreateTaskQueue(
"video_stream_decoder_bookkeeping_queue",
TaskQueueFactory::Priority::NORMAL)),
decode_thread_(&DecodeLoop,
this,
"video_stream_decoder_decode_thread",
rtc::kHighestPriority),
timing_(Clock::GetRealTimeClock()),
frame_buffer_(Clock::GetRealTimeClock(), &timing_, nullptr),
next_frame_timestamps_index_(0) {
frame_timestamps_.fill({-1, -1, -1});
decode_thread_.Start();
}
VideoStreamDecoderImpl::~VideoStreamDecoderImpl() {
frame_buffer_.Stop();
decode_thread_.Stop();
}
void VideoStreamDecoderImpl::OnFrame(
std::unique_ptr<video_coding::EncodedFrame> frame) {
if (!bookkeeping_queue_.IsCurrent()) {
struct OnFrameTask : QueuedTask {
OnFrameTask(std::unique_ptr<video_coding::EncodedFrame> frame,
VideoStreamDecoderImpl* video_stream_decoder)
: frame_(std::move(frame)),
video_stream_decoder_(video_stream_decoder) {}
bool Run() override {
video_stream_decoder_->OnFrame(std::move(frame_));
return true;
}
std::unique_ptr<video_coding::EncodedFrame> frame_;
VideoStreamDecoderImpl* video_stream_decoder_;
};
bookkeeping_queue_.PostTask(
absl::make_unique<OnFrameTask>(std::move(frame), this));
return;
}
RTC_DCHECK_RUN_ON(&bookkeeping_queue_);
uint64_t continuous_pid = frame_buffer_.InsertFrame(std::move(frame));
video_coding::VideoLayerFrameId continuous_id(continuous_pid, 0);
if (last_continuous_id_ < continuous_id) {
last_continuous_id_ = continuous_id;
callbacks_->OnContinuousUntil(last_continuous_id_);
}
}
void VideoStreamDecoderImpl::SetMinPlayoutDelay(TimeDelta min_delay) {
timing_.set_min_playout_delay(min_delay.ms());
}
void VideoStreamDecoderImpl::SetMaxPlayoutDelay(TimeDelta max_delay) {
timing_.set_max_playout_delay(max_delay.ms());
}
VideoDecoder* VideoStreamDecoderImpl::GetDecoder(int payload_type) {
if (current_payload_type_ == payload_type) {
RTC_DCHECK(decoder_);
return decoder_.get();
}
current_payload_type_.reset();
decoder_.reset();
auto decoder_settings_it = decoder_settings_.find(payload_type);
if (decoder_settings_it == decoder_settings_.end()) {
RTC_LOG(LS_WARNING) << "Payload type " << payload_type
<< " not registered.";
return nullptr;
}
const SdpVideoFormat& video_format = decoder_settings_it->second.first;
std::unique_ptr<VideoDecoder> decoder =
decoder_factory_->CreateVideoDecoder(video_format);
if (!decoder) {
RTC_LOG(LS_WARNING) << "Failed to create decoder for payload type "
<< payload_type << ".";
return nullptr;
}
int num_cores = decoder_settings_it->second.second;
int32_t init_result = decoder->InitDecode(nullptr, num_cores);
if (init_result != WEBRTC_VIDEO_CODEC_OK) {
RTC_LOG(LS_WARNING) << "Failed to initialize decoder for payload type "
<< payload_type << ".";
return nullptr;
}
int32_t register_result = decoder->RegisterDecodeCompleteCallback(this);
if (register_result != WEBRTC_VIDEO_CODEC_OK) {
RTC_LOG(LS_WARNING) << "Failed to register decode callback.";
return nullptr;
}
current_payload_type_.emplace(payload_type);
decoder_ = std::move(decoder);
return decoder_.get();
}
// static
void VideoStreamDecoderImpl::DecodeLoop(void* ptr) {
// TODO(philipel): Remove this and use rtc::Event::kForever when it's
// supported by the |frame_buffer_|.
static constexpr int kForever = 100000000;
int max_wait_time_ms = kForever;
bool keyframe_required = true;
auto* vs_decoder = static_cast<VideoStreamDecoderImpl*>(ptr);
while (true) {
DecodeResult decode_result =
vs_decoder->DecodeNextFrame(max_wait_time_ms, keyframe_required);
switch (decode_result) {
case kOk: {
max_wait_time_ms = kForever;
keyframe_required = false;
break;
}
case kDecodeFailure: {
max_wait_time_ms = 0;
keyframe_required = true;
break;
}
case kNoFrame: {
max_wait_time_ms = kForever;
// If we end up here it means that we got a decoding error and there is
// no keyframe available in the |frame_buffer_|.
vs_decoder->bookkeeping_queue_.PostTask([vs_decoder]() {
RTC_DCHECK_RUN_ON(&vs_decoder->bookkeeping_queue_);
vs_decoder->callbacks_->OnNonDecodableState();
});
break;
}
case kNoDecoder: {
max_wait_time_ms = kForever;
break;
}
case kShutdown: {
return;
}
}
}
}
VideoStreamDecoderImpl::DecodeResult VideoStreamDecoderImpl::DecodeNextFrame(
int max_wait_time_ms,
bool keyframe_required) {
std::unique_ptr<video_coding::EncodedFrame> frame;
video_coding::FrameBuffer::ReturnReason res =
frame_buffer_.NextFrame(max_wait_time_ms, &frame, keyframe_required);
if (res == video_coding::FrameBuffer::ReturnReason::kStopped)
return kShutdown;
if (frame) {
VideoDecoder* decoder = GetDecoder(frame->PayloadType());
if (!decoder) {
RTC_LOG(LS_WARNING) << "Failed to get decoder, dropping frame ("
<< frame->id.picture_id << ":"
<< frame->id.spatial_layer << ").";
return kNoDecoder;
}
int64_t decode_start_time_ms = rtc::TimeMillis();
int64_t timestamp = frame->Timestamp();
int64_t render_time_us = frame->RenderTimeMs() * 1000;
bookkeeping_queue_.PostTask(
[this, decode_start_time_ms, timestamp, render_time_us]() {
RTC_DCHECK_RUN_ON(&bookkeeping_queue_);
// Saving decode start time this way wont work if we decode spatial
// layers sequentially.
FrameTimestamps* frame_timestamps =
&frame_timestamps_[next_frame_timestamps_index_];
frame_timestamps->timestamp = timestamp;
frame_timestamps->decode_start_time_ms = decode_start_time_ms;
frame_timestamps->render_time_us = render_time_us;
next_frame_timestamps_index_ =
Add<kFrameTimestampsMemory>(next_frame_timestamps_index_, 1);
});
int32_t decode_result = decoder->Decode(frame->EncodedImage(),
false, // missing_frame
frame->RenderTimeMs());
return decode_result == WEBRTC_VIDEO_CODEC_OK ? kOk : kDecodeFailure;
}
return kNoFrame;
}
VideoStreamDecoderImpl::FrameTimestamps*
VideoStreamDecoderImpl::GetFrameTimestamps(int64_t timestamp) {
RTC_DCHECK_RUN_ON(&bookkeeping_queue_);
int start_time_index = next_frame_timestamps_index_;
for (int i = 0; i < kFrameTimestampsMemory; ++i) {
start_time_index = Subtract<kFrameTimestampsMemory>(start_time_index, 1);
if (frame_timestamps_[start_time_index].timestamp == timestamp)
return &frame_timestamps_[start_time_index];
}
return nullptr;
}
// VideoDecoder::DecodedImageCallback
int32_t VideoStreamDecoderImpl::Decoded(VideoFrame& decoded_image) {
Decoded(decoded_image, absl::nullopt, absl::nullopt);
return WEBRTC_VIDEO_CODEC_OK;
}
// VideoDecoder::DecodedImageCallback
int32_t VideoStreamDecoderImpl::Decoded(VideoFrame& decoded_image,
int64_t decode_time_ms) {
Decoded(decoded_image, decode_time_ms, absl::nullopt);
return WEBRTC_VIDEO_CODEC_OK;
}
// VideoDecoder::DecodedImageCallback
void VideoStreamDecoderImpl::Decoded(VideoFrame& decoded_image,
absl::optional<int32_t> decode_time_ms,
absl::optional<uint8_t> qp) {
int64_t decode_stop_time_ms = rtc::TimeMillis();
bookkeeping_queue_.PostTask([this, decode_stop_time_ms, decoded_image,
decode_time_ms, qp]() {
RTC_DCHECK_RUN_ON(&bookkeeping_queue_);
FrameTimestamps* frame_timestamps =
GetFrameTimestamps(decoded_image.timestamp());
if (!frame_timestamps) {
RTC_LOG(LS_ERROR) << "No frame information found for frame with timestamp"
<< decoded_image.timestamp();
return;
}
absl::optional<int> casted_qp;
if (qp)
casted_qp.emplace(*qp);
absl::optional<int> casted_decode_time_ms(decode_time_ms.value_or(
decode_stop_time_ms - frame_timestamps->decode_start_time_ms));
timing_.StopDecodeTimer(*casted_decode_time_ms, decode_stop_time_ms);
VideoFrame copy = decoded_image;
copy.set_timestamp_us(frame_timestamps->render_time_us);
callbacks_->OnDecodedFrame(copy, casted_decode_time_ms, casted_qp);
});
}
} // namespace webrtc