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/*
* Copyright (c) 2013 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 "modules/video_coding/video_receiver2.h"
#include <stddef.h>
#include <cstdint>
#include <vector>
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/video_decoder.h"
#include "modules/video_coding/decoder_database.h"
#include "modules/video_coding/encoded_frame.h"
#include "modules/video_coding/generic_decoder.h"
#include "modules/video_coding/include/video_coding_defines.h"
#include "modules/video_coding/timing/timing.h"
#include "rtc_base/checks.h"
#include "rtc_base/trace_event.h"
#include "system_wrappers/include/clock.h"
namespace webrtc {
VideoReceiver2::VideoReceiver2(Clock* clock,
VCMTiming* timing,
const FieldTrialsView& field_trials)
: clock_(clock),
timing_(timing),
decodedFrameCallback_(timing_, clock_, field_trials),
codecDataBase_() {
decoder_sequence_checker_.Detach();
}
VideoReceiver2::~VideoReceiver2() {
RTC_DCHECK_RUN_ON(&construction_sequence_checker_);
}
// Register a receive callback. Will be called whenever there is a new frame
// ready for rendering.
int32_t VideoReceiver2::RegisterReceiveCallback(
VCMReceiveCallback* receiveCallback) {
RTC_DCHECK_RUN_ON(&construction_sequence_checker_);
RTC_DCHECK(!IsDecoderThreadRunning());
// This value is set before the decoder thread starts and unset after
// the decoder thread has been stopped.
decodedFrameCallback_.SetUserReceiveCallback(receiveCallback);
return VCM_OK;
}
// Register an externally defined decoder object. This may be called on either
// the construction sequence or the decoder sequence to allow for lazy creation
// of video decoders. If called on the decoder sequence `externalDecoder` cannot
// be a nullptr. It's the responsibility of the caller to make sure that the
// access from the two sequences are mutually exclusive.
void VideoReceiver2::RegisterExternalDecoder(VideoDecoder* externalDecoder,
uint8_t payloadType) {
if (IsDecoderThreadRunning()) {
RTC_DCHECK_RUN_ON(&decoder_sequence_checker_);
// Don't allow deregistering decoders on the decoder thread.
RTC_DCHECK(externalDecoder != nullptr);
} else {
RTC_DCHECK_RUN_ON(&construction_sequence_checker_);
}
if (externalDecoder == nullptr) {
codecDataBase_.DeregisterExternalDecoder(payloadType);
return;
}
codecDataBase_.RegisterExternalDecoder(payloadType, externalDecoder);
}
bool VideoReceiver2::IsExternalDecoderRegistered(uint8_t payloadType) const {
RTC_DCHECK_RUN_ON(&decoder_sequence_checker_);
return codecDataBase_.IsExternalDecoderRegistered(payloadType);
}
void VideoReceiver2::DecoderThreadStarting() {
RTC_DCHECK_RUN_ON(&construction_sequence_checker_);
RTC_DCHECK(!IsDecoderThreadRunning());
#if RTC_DCHECK_IS_ON
decoder_thread_is_running_ = true;
#endif
}
void VideoReceiver2::DecoderThreadStopped() {
RTC_DCHECK_RUN_ON(&construction_sequence_checker_);
RTC_DCHECK(IsDecoderThreadRunning());
#if RTC_DCHECK_IS_ON
decoder_thread_is_running_ = false;
decoder_sequence_checker_.Detach();
#endif
}
// Must be called from inside the receive side critical section.
int32_t VideoReceiver2::Decode(const VCMEncodedFrame* frame) {
RTC_DCHECK_RUN_ON(&decoder_sequence_checker_);
TRACE_EVENT0("webrtc", "VideoReceiver2::Decode");
// Change decoder if payload type has changed
VCMGenericDecoder* decoder =
codecDataBase_.GetDecoder(*frame, &decodedFrameCallback_);
if (decoder == nullptr) {
return VCM_NO_CODEC_REGISTERED;
}
return decoder->Decode(*frame, clock_->CurrentTime());
}
// Register possible receive codecs, can be called multiple times
void VideoReceiver2::RegisterReceiveCodec(
uint8_t payload_type,
const VideoDecoder::Settings& settings) {
RTC_DCHECK_RUN_ON(&construction_sequence_checker_);
RTC_DCHECK(!IsDecoderThreadRunning());
codecDataBase_.RegisterReceiveCodec(payload_type, settings);
}
bool VideoReceiver2::IsDecoderThreadRunning() {
#if RTC_DCHECK_IS_ON
return decoder_thread_is_running_;
#else
return true;
#endif
}
} // namespace webrtc
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