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/*
* Copyright (c) 2010 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.
*/
// Implementation file of class VideoCapturer.
#include "media/base/videocapturer.h"
#include <algorithm>
#include "api/video/i420_buffer.h"
#include "api/video/video_frame.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/field_trial.h"
namespace cricket {
namespace {
static const int64_t kMaxDistance = ~(static_cast<int64_t>(1) << 63);
#ifdef WEBRTC_LINUX
static const int kYU12Penalty = 16; // Needs to be higher than MJPG index.
#endif
static const char* kSimulcastScreenshareFieldTrialName =
"WebRTC-SimulcastScreenshare";
} // namespace
/////////////////////////////////////////////////////////////////////
// Implementation of class VideoCapturer
/////////////////////////////////////////////////////////////////////
VideoCapturer::VideoCapturer() : apply_rotation_(false) {
thread_checker_.DetachFromThread();
Construct();
}
void VideoCapturer::Construct() {
enable_camera_list_ = false;
capture_state_ = CS_STOPPED;
scaled_width_ = 0;
scaled_height_ = 0;
enable_video_adapter_ = true;
}
const std::vector<VideoFormat>* VideoCapturer::GetSupportedFormats() const {
return &filtered_supported_formats_;
}
bool VideoCapturer::StartCapturing(const VideoFormat& capture_format) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
CaptureState result = Start(capture_format);
const bool success = (result == CS_RUNNING) || (result == CS_STARTING);
if (!success) {
return false;
}
if (result == CS_RUNNING) {
SetCaptureState(result);
}
return true;
}
void VideoCapturer::SetSupportedFormats(
const std::vector<VideoFormat>& formats) {
// This method is OK to call during initialization on a separate thread.
RTC_DCHECK(capture_state_ == CS_STOPPED ||
thread_checker_.CalledOnValidThread());
supported_formats_ = formats;
UpdateFilteredSupportedFormats();
}
bool VideoCapturer::GetBestCaptureFormat(const VideoFormat& format,
VideoFormat* best_format) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
// TODO(fbarchard): Directly support max_format.
UpdateFilteredSupportedFormats();
const std::vector<VideoFormat>* supported_formats = GetSupportedFormats();
if (supported_formats->empty()) {
return false;
}
RTC_LOG(LS_INFO) << " Capture Requested " << format.ToString();
int64_t best_distance = kMaxDistance;
std::vector<VideoFormat>::const_iterator best = supported_formats->end();
std::vector<VideoFormat>::const_iterator i;
for (i = supported_formats->begin(); i != supported_formats->end(); ++i) {
int64_t distance = GetFormatDistance(format, *i);
// TODO(fbarchard): Reduce to LS_VERBOSE if/when camera capture is
// relatively bug free.
RTC_LOG(LS_INFO) << " Supported " << i->ToString() << " distance "
<< distance;
if (distance < best_distance) {
best_distance = distance;
best = i;
}
}
if (supported_formats->end() == best) {
RTC_LOG(LS_ERROR) << " No acceptable camera format found";
return false;
}
if (best_format) {
best_format->width = best->width;
best_format->height = best->height;
best_format->fourcc = best->fourcc;
best_format->interval = best->interval;
RTC_LOG(LS_INFO) << " Best " << best_format->ToString() << " Interval "
<< best_format->interval << " distance " << best_distance;
}
return true;
}
void VideoCapturer::ConstrainSupportedFormats(const VideoFormat& max_format) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
max_format_.reset(new VideoFormat(max_format));
RTC_LOG(LS_VERBOSE) << " ConstrainSupportedFormats " << max_format.ToString();
UpdateFilteredSupportedFormats();
}
bool VideoCapturer::GetInputSize(int* width, int* height) {
rtc::CritScope cs(&frame_stats_crit_);
if (!input_size_valid_) {
return false;
}
*width = input_width_;
*height = input_height_;
return true;
}
void VideoCapturer::RemoveSink(
rtc::VideoSinkInterface<webrtc::VideoFrame>* sink) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
broadcaster_.RemoveSink(sink);
OnSinkWantsChanged(broadcaster_.wants());
}
void VideoCapturer::AddOrUpdateSink(
rtc::VideoSinkInterface<webrtc::VideoFrame>* sink,
const rtc::VideoSinkWants& wants) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
broadcaster_.AddOrUpdateSink(sink, wants);
OnSinkWantsChanged(broadcaster_.wants());
}
void VideoCapturer::OnSinkWantsChanged(const rtc::VideoSinkWants& wants) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
apply_rotation_ = wants.rotation_applied;
if (video_adapter()) {
video_adapter()->OnResolutionFramerateRequest(wants.target_pixel_count,
wants.max_pixel_count,
wants.max_framerate_fps);
}
}
bool VideoCapturer::AdaptFrame(int width,
int height,
int64_t camera_time_us,
int64_t system_time_us,
int* out_width,
int* out_height,
int* crop_width,
int* crop_height,
int* crop_x,
int* crop_y,
int64_t* translated_camera_time_us) {
if (translated_camera_time_us) {
*translated_camera_time_us =
timestamp_aligner_.TranslateTimestamp(camera_time_us, system_time_us);
}
if (!broadcaster_.frame_wanted()) {
return false;
}
bool simulcast_screenshare_enabled =
webrtc::field_trial::IsEnabled(kSimulcastScreenshareFieldTrialName);
if (enable_video_adapter_ &&
(!IsScreencast() || simulcast_screenshare_enabled)) {
if (!video_adapter_.AdaptFrameResolution(
width, height, camera_time_us * rtc::kNumNanosecsPerMicrosec,
crop_width, crop_height, out_width, out_height)) {
// VideoAdapter dropped the frame.
broadcaster_.OnDiscardedFrame();
return false;
}
*crop_x = (width - *crop_width) / 2;
*crop_y = (height - *crop_height) / 2;
} else {
*out_width = width;
*out_height = height;
*crop_width = width;
*crop_height = height;
*crop_x = 0;
*crop_y = 0;
}
return true;
}
void VideoCapturer::OnFrame(const webrtc::VideoFrame& frame,
int orig_width,
int orig_height) {
// For a child class which implements rotation itself, we should
// always have apply_rotation_ == false or frame.rotation() == 0.
// Except possibly during races where apply_rotation_ is changed
// mid-stream.
if (apply_rotation_ && frame.rotation() != webrtc::kVideoRotation_0) {
rtc::scoped_refptr<webrtc::VideoFrameBuffer> buffer(
frame.video_frame_buffer());
if (buffer->type() != webrtc::VideoFrameBuffer::Type::kI420) {
// Sources producing non-I420 frames must handle apply_rotation
// themselves. But even if they do, we may occasionally end up
// in this case, for frames in flight at the time
// applied_rotation is set to true. In that case, we just drop
// the frame.
RTC_LOG(LS_WARNING) << "Non-I420 frame requiring rotation. Discarding.";
return;
}
broadcaster_.OnFrame(webrtc::VideoFrame(
webrtc::I420Buffer::Rotate(*buffer->GetI420(), frame.rotation()),
webrtc::kVideoRotation_0, frame.timestamp_us()));
} else {
broadcaster_.OnFrame(frame);
}
UpdateInputSize(orig_width, orig_height);
}
void VideoCapturer::SetCaptureState(CaptureState state) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
if (state == capture_state_) {
// Don't trigger a state changed callback if the state hasn't changed.
return;
}
capture_state_ = state;
SignalStateChange(this, capture_state_);
}
// Get the distance between the supported and desired formats.
// Prioritization is done according to this algorithm:
// 1) Width closeness. If not same, we prefer wider.
// 2) Height closeness. If not same, we prefer higher.
// 3) Framerate closeness. If not same, we prefer faster.
// 4) Compression. If desired format has a specific fourcc, we need exact match;
// otherwise, we use preference.
int64_t VideoCapturer::GetFormatDistance(const VideoFormat& desired,
const VideoFormat& supported) {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
int64_t distance = kMaxDistance;
// Check fourcc.
uint32_t supported_fourcc = CanonicalFourCC(supported.fourcc);
int64_t delta_fourcc = kMaxDistance;
if (FOURCC_ANY == desired.fourcc) {
// Any fourcc is OK for the desired. Use preference to find best fourcc.
std::vector<uint32_t> preferred_fourccs;
if (!GetPreferredFourccs(&preferred_fourccs)) {
return distance;
}
for (size_t i = 0; i < preferred_fourccs.size(); ++i) {
if (supported_fourcc == CanonicalFourCC(preferred_fourccs[i])) {
delta_fourcc = i;
#ifdef WEBRTC_LINUX
// For HD avoid YU12 which is a software conversion and has 2 bugs
// b/7326348 b/6960899. Reenable when fixed.
if (supported.height >= 720 && (supported_fourcc == FOURCC_YU12 ||
supported_fourcc == FOURCC_YV12)) {
delta_fourcc += kYU12Penalty;
}
#endif
break;
}
}
} else if (supported_fourcc == CanonicalFourCC(desired.fourcc)) {
delta_fourcc = 0; // Need exact match.
}
if (kMaxDistance == delta_fourcc) {
// Failed to match fourcc.
return distance;
}
// Check resolution and fps.
int desired_width = desired.width;
int desired_height = desired.height;
int64_t delta_w = supported.width - desired_width;
float supported_fps = VideoFormat::IntervalToFpsFloat(supported.interval);
float delta_fps =
supported_fps - VideoFormat::IntervalToFpsFloat(desired.interval);
// Check height of supported height compared to height we would like it to be.
int64_t aspect_h = desired_width
? supported.width * desired_height / desired_width
: desired_height;
int64_t delta_h = supported.height - aspect_h;
distance = 0;
// Set high penalty if the supported format is lower than the desired format.
// 3x means we would prefer down to down to 3/4, than up to double.
// But we'd prefer up to double than down to 1/2. This is conservative,
// strongly avoiding going down in resolution, similar to
// the old method, but not completely ruling it out in extreme situations.
// It also ignores framerate, which is often very low at high resolutions.
// TODO(fbarchard): Improve logic to use weighted factors.
static const int kDownPenalty = -3;
if (delta_w < 0) {
delta_w = delta_w * kDownPenalty;
}
if (delta_h < 0) {
delta_h = delta_h * kDownPenalty;
}
// Require camera fps to be at least 80% of what is requested if resolution
// matches.
// Require camera fps to be at least 96% of what is requested, or higher,
// if resolution differs. 96% allows for slight variations in fps. e.g. 29.97
if (delta_fps < 0) {
float min_desirable_fps = delta_w ?
VideoFormat::IntervalToFpsFloat(desired.interval) * 28.f / 30.f :
VideoFormat::IntervalToFpsFloat(desired.interval) * 23.f / 30.f;
delta_fps = -delta_fps;
if (supported_fps < min_desirable_fps) {
distance |= static_cast<int64_t>(1) << 62;
} else {
distance |= static_cast<int64_t>(1) << 15;
}
}
int64_t idelta_fps = static_cast<int>(delta_fps);
// 12 bits for width and height and 8 bits for fps and fourcc.
distance |=
(delta_w << 28) | (delta_h << 16) | (idelta_fps << 8) | delta_fourcc;
return distance;
}
void VideoCapturer::UpdateFilteredSupportedFormats() {
filtered_supported_formats_.clear();
filtered_supported_formats_ = supported_formats_;
if (!max_format_) {
return;
}
std::vector<VideoFormat>::iterator iter = filtered_supported_formats_.begin();
while (iter != filtered_supported_formats_.end()) {
if (ShouldFilterFormat(*iter)) {
iter = filtered_supported_formats_.erase(iter);
} else {
++iter;
}
}
if (filtered_supported_formats_.empty()) {
// The device only captures at resolutions higher than |max_format_| this
// indicates that |max_format_| should be ignored as it is better to capture
// at too high a resolution than to not capture at all.
filtered_supported_formats_ = supported_formats_;
}
}
bool VideoCapturer::ShouldFilterFormat(const VideoFormat& format) const {
RTC_DCHECK(thread_checker_.CalledOnValidThread());
if (!enable_camera_list_) {
return false;
}
return format.width > max_format_->width ||
format.height > max_format_->height;
}
void VideoCapturer::UpdateInputSize(int width, int height) {
// Update stats protected from fetches from different thread.
rtc::CritScope cs(&frame_stats_crit_);
input_size_valid_ = true;
input_width_ = width;
input_height_ = height;
}
} // namespace cricket