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/*
* Copyright (c) 2012 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/video/video_capture_input.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/trace_event.h"
#include "webrtc/modules/include/module_common_types.h"
#include "webrtc/modules/utility/include/process_thread.h"
#include "webrtc/modules/video_capture/video_capture_factory.h"
#include "webrtc/modules/video_processing/include/video_processing.h"
#include "webrtc/modules/video_render/video_render_defines.h"
#include "webrtc/system_wrappers/include/clock.h"
#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
#include "webrtc/system_wrappers/include/tick_util.h"
#include "webrtc/video/overuse_frame_detector.h"
#include "webrtc/video/send_statistics_proxy.h"
#include "webrtc/video/vie_encoder.h"
namespace webrtc {
namespace internal {
VideoCaptureInput::VideoCaptureInput(
ProcessThread* module_process_thread,
VideoCaptureCallback* frame_callback,
VideoRenderer* local_renderer,
SendStatisticsProxy* stats_proxy,
CpuOveruseObserver* overuse_observer,
EncodingTimeObserver* encoding_time_observer)
: capture_cs_(CriticalSectionWrapper::CreateCriticalSection()),
module_process_thread_(module_process_thread),
frame_callback_(frame_callback),
local_renderer_(local_renderer),
stats_proxy_(stats_proxy),
incoming_frame_cs_(CriticalSectionWrapper::CreateCriticalSection()),
encoder_thread_(EncoderThreadFunction, this, "EncoderThread"),
capture_event_(false, false),
stop_(0),
last_captured_timestamp_(0),
delta_ntp_internal_ms_(
Clock::GetRealTimeClock()->CurrentNtpInMilliseconds() -
TickTime::MillisecondTimestamp()),
overuse_detector_(new OveruseFrameDetector(Clock::GetRealTimeClock(),
CpuOveruseOptions(),
overuse_observer,
stats_proxy)),
encoding_time_observer_(encoding_time_observer) {
encoder_thread_.Start();
encoder_thread_.SetPriority(rtc::kHighPriority);
module_process_thread_->RegisterModule(overuse_detector_.get());
}
VideoCaptureInput::~VideoCaptureInput() {
module_process_thread_->DeRegisterModule(overuse_detector_.get());
// Stop the thread.
rtc::AtomicOps::ReleaseStore(&stop_, 1);
capture_event_.Set();
encoder_thread_.Stop();
}
void VideoCaptureInput::IncomingCapturedFrame(const VideoFrame& video_frame) {
// TODO(pbos): Remove local rendering, it should be handled by the client code
// if required.
if (local_renderer_)
local_renderer_->RenderFrame(video_frame, 0);
stats_proxy_->OnIncomingFrame(video_frame.width(), video_frame.height());
VideoFrame incoming_frame = video_frame;
if (incoming_frame.ntp_time_ms() != 0) {
// If a NTP time stamp is set, this is the time stamp we will use.
incoming_frame.set_render_time_ms(incoming_frame.ntp_time_ms() -
delta_ntp_internal_ms_);
} else { // NTP time stamp not set.
int64_t render_time = incoming_frame.render_time_ms() != 0
? incoming_frame.render_time_ms()
: TickTime::MillisecondTimestamp();
incoming_frame.set_render_time_ms(render_time);
incoming_frame.set_ntp_time_ms(render_time + delta_ntp_internal_ms_);
}
// Convert NTP time, in ms, to RTP timestamp.
const int kMsToRtpTimestamp = 90;
incoming_frame.set_timestamp(
kMsToRtpTimestamp * static_cast<uint32_t>(incoming_frame.ntp_time_ms()));
CriticalSectionScoped cs(capture_cs_.get());
if (incoming_frame.ntp_time_ms() <= last_captured_timestamp_) {
// We don't allow the same capture time for two frames, drop this one.
LOG(LS_WARNING) << "Same/old NTP timestamp ("
<< incoming_frame.ntp_time_ms()
<< " <= " << last_captured_timestamp_
<< ") for incoming frame. Dropping.";
return;
}
captured_frame_.ShallowCopy(incoming_frame);
last_captured_timestamp_ = incoming_frame.ntp_time_ms();
overuse_detector_->FrameCaptured(captured_frame_.width(),
captured_frame_.height(),
captured_frame_.render_time_ms());
TRACE_EVENT_ASYNC_BEGIN1("webrtc", "Video", video_frame.render_time_ms(),
"render_time", video_frame.render_time_ms());
capture_event_.Set();
}
bool VideoCaptureInput::EncoderThreadFunction(void* obj) {
return static_cast<VideoCaptureInput*>(obj)->EncoderProcess();
}
bool VideoCaptureInput::EncoderProcess() {
static const int kThreadWaitTimeMs = 100;
int64_t capture_time = -1;
if (capture_event_.Wait(kThreadWaitTimeMs)) {
if (rtc::AtomicOps::AcquireLoad(&stop_))
return false;
int64_t encode_start_time = -1;
VideoFrame deliver_frame;
{
CriticalSectionScoped cs(capture_cs_.get());
if (!captured_frame_.IsZeroSize()) {
deliver_frame = captured_frame_;
captured_frame_.Reset();
}
}
if (!deliver_frame.IsZeroSize()) {
capture_time = deliver_frame.render_time_ms();
encode_start_time = Clock::GetRealTimeClock()->TimeInMilliseconds();
frame_callback_->DeliverFrame(deliver_frame);
}
// Update the overuse detector with the duration.
if (encode_start_time != -1) {
int encode_time_ms = static_cast<int>(
Clock::GetRealTimeClock()->TimeInMilliseconds() - encode_start_time);
stats_proxy_->OnEncodedFrame(encode_time_ms);
if (encoding_time_observer_) {
encoding_time_observer_->OnReportEncodedTime(
deliver_frame.ntp_time_ms(), encode_time_ms);
}
}
}
// We're done!
if (capture_time != -1) {
overuse_detector_->FrameSent(capture_time);
}
return true;
}
} // namespace internal
} // namespace webrtc
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