| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "remoting/codec/webrtc_video_encoder_vpx.h" |
| |
| #include <utility> |
| |
| #include "base/bind.h" |
| #include "base/logging.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/sys_info.h" |
| #include "remoting/base/util.h" |
| #include "remoting/proto/video.pb.h" |
| #include "third_party/libyuv/include/libyuv/convert_from_argb.h" |
| #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h" |
| #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h" |
| #include "third_party/webrtc/modules/desktop_capture/desktop_region.h" |
| |
| extern "C" { |
| #define VPX_CODEC_DISABLE_COMPAT 1 |
| #include "third_party/libvpx/source/libvpx/vpx/vp8cx.h" |
| #include "third_party/libvpx/source/libvpx/vpx/vpx_encoder.h" |
| } |
| |
| namespace remoting { |
| |
| namespace { |
| |
| // Number of bytes in an RGBx pixel. |
| const int kBytesPerRgbPixel = 4; |
| |
| // Defines the dimension of a macro block. This is used to compute the active |
| // map for the encoder. |
| const int kMacroBlockSize = 16; |
| |
| // Magic encoder profile numbers for I420 and I444 input formats. |
| const int kVp9I420ProfileNumber = 0; |
| const int kVp9I444ProfileNumber = 1; |
| |
| // Magic encoder constants for adaptive quantization strategy. |
| const int kVp9AqModeNone = 0; |
| const int kVp9AqModeCyclicRefresh = 3; |
| |
| const int kDefaultTargetBitrateKbps = 1000; |
| |
| void SetCommonCodecParameters(vpx_codec_enc_cfg_t* config, |
| const webrtc::DesktopSize& size) { |
| // Use millisecond granularity time base. |
| config->g_timebase.num = 1; |
| config->g_timebase.den = base::Time::kMicrosecondsPerSecond; |
| |
| config->g_w = size.width(); |
| config->g_h = size.height(); |
| config->g_pass = VPX_RC_ONE_PASS; |
| |
| // Start emitting packets immediately. |
| config->g_lag_in_frames = 0; |
| |
| // Since the transport layer is reliable, keyframes should not be necessary. |
| // However, due to crbug.com/440223, decoding fails after 30,000 non-key |
| // frames, so take the hit of an "unnecessary" key-frame every 10,000 frames. |
| config->kf_min_dist = 10000; |
| config->kf_max_dist = 10000; |
| |
| // Allow multiple cores on a system to be used for encoding for |
| // performance while at the same time ensuring we do not saturate. |
| config->g_threads = (base::SysInfo::NumberOfProcessors() + 1) / 2; |
| |
| // Do not drop any frames at encoder. |
| config->rc_dropframe_thresh = 0; |
| // We do not want variations in bandwidth. |
| config->rc_end_usage = VPX_CBR; |
| config->rc_undershoot_pct = 100; |
| config->rc_overshoot_pct = 15; |
| } |
| |
| void SetVp8CodecParameters(vpx_codec_enc_cfg_t* config, |
| const webrtc::DesktopSize& size) { |
| SetCommonCodecParameters(config, size); |
| |
| // Value of 2 means using the real time profile. This is basically a |
| // redundant option since we explicitly select real time mode when doing |
| // encoding. |
| config->g_profile = 2; |
| |
| // To enable remoting to be highly interactive and allow the target bitrate |
| // to be met, we relax the max quantizer. The quality will get topped-off |
| // in subsequent frames. |
| config->rc_min_quantizer = 20; |
| config->rc_max_quantizer = 63; |
| } |
| |
| void SetVp9CodecParameters(vpx_codec_enc_cfg_t* config, |
| const webrtc::DesktopSize& size, |
| bool lossless_color, |
| bool lossless_encode) { |
| SetCommonCodecParameters(config, size); |
| |
| // Configure VP9 for I420 or I444 source frames. |
| config->g_profile = |
| lossless_color ? kVp9I444ProfileNumber : kVp9I420ProfileNumber; |
| |
| if (lossless_encode) { |
| // Disable quantization entirely, putting the encoder in "lossless" mode. |
| config->rc_min_quantizer = 0; |
| config->rc_max_quantizer = 0; |
| config->rc_end_usage = VPX_VBR; |
| } else { |
| // TODO(wez): Set quantization range to 4-40, once the libvpx encoder is |
| // updated not to output any bits if nothing needs topping-off. |
| config->rc_min_quantizer = 20; |
| config->rc_max_quantizer = 30; |
| config->rc_end_usage = VPX_CBR; |
| // In the absence of a good bandwidth estimator set the target bitrate to a |
| // conservative default. |
| config->rc_target_bitrate = 500; |
| } |
| } |
| |
| void SetVp8CodecOptions(vpx_codec_ctx_t* codec) { |
| // CPUUSED of 16 will have the smallest CPU load. This turns off sub-pixel |
| // motion search. |
| vpx_codec_err_t ret = vpx_codec_control(codec, VP8E_SET_CPUUSED, 16); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set CPUUSED"; |
| |
| // Use the lowest level of noise sensitivity so as to spend less time |
| // on motion estimation and inter-prediction mode. |
| ret = vpx_codec_control(codec, VP8E_SET_NOISE_SENSITIVITY, 0); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set noise sensitivity"; |
| } |
| |
| void SetVp9CodecOptions(vpx_codec_ctx_t* codec, bool lossless_encode) { |
| // Request the lowest-CPU usage that VP9 supports, which depends on whether |
| // we are encoding lossy or lossless. |
| // Note that this is configured via the same parameter as for VP8. |
| int cpu_used = lossless_encode ? 5 : 6; |
| vpx_codec_err_t ret = vpx_codec_control(codec, VP8E_SET_CPUUSED, cpu_used); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set CPUUSED"; |
| |
| // Use the lowest level of noise sensitivity so as to spend less time |
| // on motion estimation and inter-prediction mode. |
| ret = vpx_codec_control(codec, VP9E_SET_NOISE_SENSITIVITY, 0); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set noise sensitivity"; |
| |
| // Configure the codec to tune it for screen media. |
| ret = vpx_codec_control(codec, VP9E_SET_TUNE_CONTENT, VP9E_CONTENT_SCREEN); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set screen content mode"; |
| |
| // Set cyclic refresh (aka "top-off") only for lossy encoding. |
| int aq_mode = lossless_encode ? kVp9AqModeNone : kVp9AqModeCyclicRefresh; |
| ret = vpx_codec_control(codec, VP9E_SET_AQ_MODE, aq_mode); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to set aq mode"; |
| } |
| |
| void FreeImageIfMismatched(bool use_i444, |
| const webrtc::DesktopSize& size, |
| std::unique_ptr<vpx_image_t>* out_image, |
| std::unique_ptr<uint8_t[]>* out_image_buffer) { |
| if (*out_image) { |
| const vpx_img_fmt_t desired_fmt = |
| use_i444 ? VPX_IMG_FMT_I444 : VPX_IMG_FMT_I420; |
| if (!size.equals(webrtc::DesktopSize((*out_image)->w, (*out_image)->h)) || |
| (*out_image)->fmt != desired_fmt) { |
| out_image_buffer->reset(); |
| out_image->reset(); |
| } |
| } |
| } |
| |
| void CreateImage(bool use_i444, |
| const webrtc::DesktopSize& size, |
| std::unique_ptr<vpx_image_t>* out_image, |
| std::unique_ptr<uint8_t[]>* out_image_buffer) { |
| DCHECK(!size.is_empty()); |
| DCHECK(!*out_image_buffer); |
| DCHECK(!*out_image); |
| |
| std::unique_ptr<vpx_image_t> image(new vpx_image_t()); |
| memset(image.get(), 0, sizeof(vpx_image_t)); |
| |
| // libvpx seems to require both to be assigned. |
| image->d_w = size.width(); |
| image->w = size.width(); |
| image->d_h = size.height(); |
| image->h = size.height(); |
| |
| // libvpx should derive chroma shifts from|fmt| but currently has a bug: |
| // https://code.google.com/p/webm/issues/detail?id=627 |
| if (use_i444) { |
| image->fmt = VPX_IMG_FMT_I444; |
| image->x_chroma_shift = 0; |
| image->y_chroma_shift = 0; |
| } else { // I420 |
| image->fmt = VPX_IMG_FMT_YV12; |
| image->x_chroma_shift = 1; |
| image->y_chroma_shift = 1; |
| } |
| |
| // libyuv's fast-path requires 16-byte aligned pointers and strides, so pad |
| // the Y, U and V planes' strides to multiples of 16 bytes. |
| const int y_stride = ((image->w - 1) & ~15) + 16; |
| const int uv_unaligned_stride = y_stride >> image->x_chroma_shift; |
| const int uv_stride = ((uv_unaligned_stride - 1) & ~15) + 16; |
| |
| // libvpx accesses the source image in macro blocks, and will over-read |
| // if the image is not padded out to the next macroblock: crbug.com/119633. |
| // Pad the Y, U and V planes' height out to compensate. |
| // Assuming macroblocks are 16x16, aligning the planes' strides above also |
| // macroblock aligned them. |
| static_assert(kMacroBlockSize == 16, "macroblock_size_not_16"); |
| const int y_rows = |
| ((image->h - 1) & ~(kMacroBlockSize - 1)) + kMacroBlockSize; |
| const int uv_rows = y_rows >> image->y_chroma_shift; |
| |
| // Allocate a YUV buffer large enough for the aligned data & padding. |
| const int buffer_size = y_stride * y_rows + 2 * uv_stride * uv_rows; |
| std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[buffer_size]); |
| |
| // Reset image value to 128 so we just need to fill in the y plane. |
| memset(image_buffer.get(), 128, buffer_size); |
| |
| // Fill in the information for |image_|. |
| unsigned char* uchar_buffer = |
| reinterpret_cast<unsigned char*>(image_buffer.get()); |
| image->planes[0] = uchar_buffer; |
| image->planes[1] = image->planes[0] + y_stride * y_rows; |
| image->planes[2] = image->planes[1] + uv_stride * uv_rows; |
| image->stride[0] = y_stride; |
| image->stride[1] = uv_stride; |
| image->stride[2] = uv_stride; |
| |
| *out_image = std::move(image); |
| *out_image_buffer = std::move(image_buffer); |
| } |
| |
| } // namespace |
| |
| // static |
| std::unique_ptr<WebrtcVideoEncoderVpx> WebrtcVideoEncoderVpx::CreateForVP8() { |
| return base::WrapUnique(new WebrtcVideoEncoderVpx(false)); |
| } |
| |
| // static |
| std::unique_ptr<WebrtcVideoEncoderVpx> WebrtcVideoEncoderVpx::CreateForVP9() { |
| return base::WrapUnique(new WebrtcVideoEncoderVpx(true)); |
| } |
| |
| WebrtcVideoEncoderVpx::~WebrtcVideoEncoderVpx() {} |
| |
| void WebrtcVideoEncoderVpx::SetTickClockForTests(base::TickClock* tick_clock) { |
| clock_ = tick_clock; |
| } |
| |
| void WebrtcVideoEncoderVpx::SetLosslessEncode(bool want_lossless) { |
| if (use_vp9_ && (want_lossless != lossless_encode_)) { |
| lossless_encode_ = want_lossless; |
| if (codec_) |
| Configure(webrtc::DesktopSize(codec_->config.enc->g_w, |
| codec_->config.enc->g_h)); |
| } |
| } |
| |
| void WebrtcVideoEncoderVpx::SetLosslessColor(bool want_lossless) { |
| if (use_vp9_ && (want_lossless != lossless_color_)) { |
| lossless_color_ = want_lossless; |
| // TODO(wez): Switch to ConfigureCodec() path once libvpx supports it. |
| // See https://code.google.com/p/webm/issues/detail?id=913. |
| // if (codec_) |
| // Configure(webrtc::DesktopSize(codec_->config.enc->g_w, |
| // codec_->config.enc->g_h)); |
| codec_.reset(); |
| } |
| } |
| |
| std::unique_ptr<WebrtcVideoEncoder::EncodedFrame> WebrtcVideoEncoderVpx::Encode( |
| const webrtc::DesktopFrame& frame, |
| const FrameParams& params) { |
| DCHECK_LE(32, frame.size().width()); |
| DCHECK_LE(32, frame.size().height()); |
| |
| // Create or reconfigure the codec to match the size of |frame|. |
| if (!codec_ || |
| (image_ && |
| !frame.size().equals(webrtc::DesktopSize(image_->w, image_->h)))) { |
| Configure(frame.size()); |
| } |
| |
| UpdateConfig(params); |
| |
| vpx_active_map_t act_map; |
| act_map.rows = active_map_size_.height(); |
| act_map.cols = active_map_size_.width(); |
| act_map.active_map = active_map_.get(); |
| |
| webrtc::DesktopRegion updated_region; |
| // Convert the updated capture data ready for encode. |
| PrepareImage(frame, &updated_region); |
| |
| // Update active map based on updated region. |
| if (params.clear_active_map) |
| ClearActiveMap(); |
| |
| if (params.key_frame) |
| updated_region.SetRect(webrtc::DesktopRect::MakeSize(frame.size())); |
| |
| SetActiveMapFromRegion(updated_region); |
| |
| // Apply active map to the encoder. |
| if (vpx_codec_control(codec_.get(), VP8E_SET_ACTIVEMAP, &act_map)) { |
| LOG(ERROR) << "Unable to apply active map"; |
| } |
| |
| vpx_codec_err_t ret = vpx_codec_encode( |
| codec_.get(), image_.get(), 0, params.duration.InMicroseconds(), |
| (params.key_frame) ? VPX_EFLAG_FORCE_KF : 0, VPX_DL_REALTIME); |
| DCHECK_EQ(ret, VPX_CODEC_OK) |
| << "Encoding error: " << vpx_codec_err_to_string(ret) << "\n" |
| << "Details: " << vpx_codec_error(codec_.get()) << "\n" |
| << vpx_codec_error_detail(codec_.get()); |
| |
| if (!lossless_encode_) { |
| // VP8 doesn't return active map, so we assume it's the same on the output |
| // as on the input. |
| if (use_vp9_) { |
| ret = vpx_codec_control(codec_.get(), VP9E_GET_ACTIVEMAP, &act_map); |
| DCHECK_EQ(ret, VPX_CODEC_OK) |
| << "Failed to fetch active map: " << vpx_codec_err_to_string(ret) |
| << "\n"; |
| } |
| |
| UpdateRegionFromActiveMap(&updated_region); |
| } |
| |
| // Read the encoded data. |
| vpx_codec_iter_t iter = nullptr; |
| bool got_data = false; |
| |
| std::unique_ptr<EncodedFrame> encoded_frame(new EncodedFrame()); |
| encoded_frame->size = frame.size(); |
| |
| while (!got_data) { |
| const vpx_codec_cx_pkt_t* vpx_packet = |
| vpx_codec_get_cx_data(codec_.get(), &iter); |
| if (!vpx_packet) |
| continue; |
| |
| switch (vpx_packet->kind) { |
| case VPX_CODEC_CX_FRAME_PKT: { |
| got_data = true; |
| // TODO(sergeyu): Avoid copying the data here.. |
| encoded_frame->data.assign( |
| reinterpret_cast<const char*>(vpx_packet->data.frame.buf), |
| vpx_packet->data.frame.sz); |
| encoded_frame->key_frame = |
| vpx_packet->data.frame.flags & VPX_FRAME_IS_KEY; |
| CHECK_EQ(vpx_codec_control(codec_.get(), VP8E_GET_LAST_QUANTIZER_64, |
| &(encoded_frame->quantizer)), |
| VPX_CODEC_OK); |
| break; |
| } |
| default: |
| break; |
| } |
| } |
| |
| return encoded_frame; |
| } |
| |
| WebrtcVideoEncoderVpx::WebrtcVideoEncoderVpx(bool use_vp9) |
| : use_vp9_(use_vp9), |
| clock_(&default_tick_clock_) { |
| // Indicates config is still uninitialized. |
| config_.g_timebase.den = 0; |
| } |
| |
| void WebrtcVideoEncoderVpx::Configure(const webrtc::DesktopSize& size) { |
| DCHECK(use_vp9_ || !lossless_color_); |
| DCHECK(use_vp9_ || !lossless_encode_); |
| |
| // Tear down |image_| if it no longer matches the size and color settings. |
| // PrepareImage() will then create a new buffer of the required dimensions if |
| // |image_| is not allocated. |
| FreeImageIfMismatched(lossless_color_, size, &image_, &image_buffer_); |
| |
| // Initialize active map. |
| active_map_size_ = webrtc::DesktopSize( |
| (size.width() + kMacroBlockSize - 1) / kMacroBlockSize, |
| (size.height() + kMacroBlockSize - 1) / kMacroBlockSize); |
| active_map_.reset( |
| new uint8_t[active_map_size_.width() * active_map_size_.height()]); |
| ClearActiveMap(); |
| |
| // TODO(wez): Remove this hack once VPX can handle frame size reconfiguration. |
| // See https://code.google.com/p/webm/issues/detail?id=912. |
| if (codec_) { |
| // If the frame size has changed then force re-creation of the codec. |
| if (codec_->config.enc->g_w != static_cast<unsigned int>(size.width()) || |
| codec_->config.enc->g_h != static_cast<unsigned int>(size.height())) { |
| codec_.reset(); |
| } |
| } |
| |
| // Fetch a default configuration for the desired codec. |
| const vpx_codec_iface_t* interface = |
| use_vp9_ ? vpx_codec_vp9_cx() : vpx_codec_vp8_cx(); |
| vpx_codec_err_t ret = vpx_codec_enc_config_default(interface, &config_, 0); |
| DCHECK_EQ(VPX_CODEC_OK, ret) << "Failed to fetch default configuration"; |
| |
| // Customize the default configuration to our needs. |
| if (use_vp9_) { |
| SetVp9CodecParameters(&config_, size, lossless_color_, lossless_encode_); |
| } else { |
| SetVp8CodecParameters(&config_, size); |
| } |
| |
| config_.rc_target_bitrate = kDefaultTargetBitrateKbps; |
| |
| // Initialize or re-configure the codec with the custom configuration. |
| if (!codec_) { |
| codec_.reset(new vpx_codec_ctx_t); |
| ret = vpx_codec_enc_init(codec_.get(), interface, &config_, 0); |
| CHECK_EQ(VPX_CODEC_OK, ret) << "Failed to initialize codec"; |
| } else { |
| ret = vpx_codec_enc_config_set(codec_.get(), &config_); |
| CHECK_EQ(VPX_CODEC_OK, ret) << "Failed to reconfigure codec"; |
| } |
| |
| // Apply further customizations to the codec now it's initialized. |
| if (use_vp9_) { |
| SetVp9CodecOptions(codec_.get(), lossless_encode_); |
| } else { |
| SetVp8CodecOptions(codec_.get()); |
| } |
| } |
| |
| void WebrtcVideoEncoderVpx::UpdateConfig(const FrameParams& params) { |
| // Configuration not initialized. |
| if (config_.g_timebase.den == 0) |
| return; |
| |
| bool changed = false; |
| |
| if (params.bitrate_kbps >= 0 && |
| config_.rc_target_bitrate != |
| static_cast<unsigned int>(params.bitrate_kbps)) { |
| config_.rc_target_bitrate = params.bitrate_kbps; |
| changed = true; |
| } |
| |
| if (params.vpx_min_quantizer >= 0 && |
| config_.rc_min_quantizer != |
| static_cast<unsigned int>(params.vpx_min_quantizer)) { |
| config_.rc_min_quantizer = params.vpx_min_quantizer; |
| changed = true; |
| } |
| |
| if (params.vpx_max_quantizer >= 0 && |
| config_.rc_max_quantizer != |
| static_cast<unsigned int>(params.vpx_max_quantizer)) { |
| config_.rc_max_quantizer = params.vpx_max_quantizer; |
| changed = true; |
| } |
| |
| if (!changed) |
| return; |
| |
| // Update encoder context. |
| if (vpx_codec_enc_config_set(codec_.get(), &config_)) |
| NOTREACHED() << "Unable to set encoder config"; |
| |
| } |
| |
| void WebrtcVideoEncoderVpx::PrepareImage( |
| const webrtc::DesktopFrame& frame, |
| webrtc::DesktopRegion* updated_region) { |
| if (frame.updated_region().is_empty()) { |
| updated_region->Clear(); |
| return; |
| } |
| |
| updated_region->Clear(); |
| if (image_) { |
| // Pad each rectangle to avoid the block-artifact filters in libvpx from |
| // introducing artifacts; VP9 includes up to 8px either side, and VP8 up to |
| // 3px, so unchanged pixels up to that far out may still be affected by the |
| // changes in the updated region, and so must be listed in the active map. |
| // After padding we align each rectangle to 16x16 active-map macroblocks. |
| // This implicitly ensures all rects have even top-left coords, which is |
| // is required by ConvertRGBToYUVWithRect(). |
| // TODO(wez): Do we still need 16x16 align, or is even alignment sufficient? |
| int padding = use_vp9_ ? 8 : 3; |
| for (webrtc::DesktopRegion::Iterator r(frame.updated_region()); |
| !r.IsAtEnd(); r.Advance()) { |
| const webrtc::DesktopRect& rect = r.rect(); |
| updated_region->AddRect(AlignRect(webrtc::DesktopRect::MakeLTRB( |
| rect.left() - padding, rect.top() - padding, rect.right() + padding, |
| rect.bottom() + padding))); |
| } |
| DCHECK(!updated_region->is_empty()); |
| |
| // Clip back to the screen dimensions, in case they're not macroblock |
| // aligned. The conversion routines don't require even width & height, |
| // so this is safe even if the source dimensions are not even. |
| updated_region->IntersectWith( |
| webrtc::DesktopRect::MakeWH(image_->w, image_->h)); |
| } else { |
| CreateImage(lossless_color_, frame.size(), &image_, &image_buffer_); |
| updated_region->AddRect(webrtc::DesktopRect::MakeWH(image_->w, image_->h)); |
| } |
| |
| // Convert the updated region to YUV ready for encoding. |
| const uint8_t* rgb_data = frame.data(); |
| const int rgb_stride = frame.stride(); |
| const int y_stride = image_->stride[0]; |
| DCHECK_EQ(image_->stride[1], image_->stride[2]); |
| const int uv_stride = image_->stride[1]; |
| uint8_t* y_data = image_->planes[0]; |
| uint8_t* u_data = image_->planes[1]; |
| uint8_t* v_data = image_->planes[2]; |
| |
| switch (image_->fmt) { |
| case VPX_IMG_FMT_I444: |
| for (webrtc::DesktopRegion::Iterator r(*updated_region); !r.IsAtEnd(); |
| r.Advance()) { |
| const webrtc::DesktopRect& rect = r.rect(); |
| int rgb_offset = |
| rgb_stride * rect.top() + rect.left() * kBytesPerRgbPixel; |
| int yuv_offset = uv_stride * rect.top() + rect.left(); |
| libyuv::ARGBToI444(rgb_data + rgb_offset, rgb_stride, |
| y_data + yuv_offset, y_stride, u_data + yuv_offset, |
| uv_stride, v_data + yuv_offset, uv_stride, |
| rect.width(), rect.height()); |
| } |
| break; |
| case VPX_IMG_FMT_YV12: |
| for (webrtc::DesktopRegion::Iterator r(*updated_region); !r.IsAtEnd(); |
| r.Advance()) { |
| const webrtc::DesktopRect& rect = r.rect(); |
| int rgb_offset = |
| rgb_stride * rect.top() + rect.left() * kBytesPerRgbPixel; |
| int y_offset = y_stride * rect.top() + rect.left(); |
| int uv_offset = uv_stride * rect.top() / 2 + rect.left() / 2; |
| libyuv::ARGBToI420(rgb_data + rgb_offset, rgb_stride, y_data + y_offset, |
| y_stride, u_data + uv_offset, uv_stride, |
| v_data + uv_offset, uv_stride, rect.width(), |
| rect.height()); |
| } |
| break; |
| default: |
| NOTREACHED(); |
| break; |
| } |
| } |
| |
| void WebrtcVideoEncoderVpx::ClearActiveMap() { |
| DCHECK(active_map_); |
| // Clear active map first. |
| memset(active_map_.get(), 0, |
| active_map_size_.width() * active_map_size_.height()); |
| } |
| |
| void WebrtcVideoEncoderVpx::SetActiveMapFromRegion( |
| const webrtc::DesktopRegion& updated_region) { |
| // Mark updated areas active. |
| for (webrtc::DesktopRegion::Iterator r(updated_region); !r.IsAtEnd(); |
| r.Advance()) { |
| const webrtc::DesktopRect& rect = r.rect(); |
| int left = rect.left() / kMacroBlockSize; |
| int right = (rect.right() - 1) / kMacroBlockSize; |
| int top = rect.top() / kMacroBlockSize; |
| int bottom = (rect.bottom() - 1) / kMacroBlockSize; |
| DCHECK_LT(right, active_map_size_.width()); |
| DCHECK_LT(bottom, active_map_size_.height()); |
| |
| uint8_t* map = active_map_.get() + top * active_map_size_.width(); |
| for (int y = top; y <= bottom; ++y) { |
| for (int x = left; x <= right; ++x) |
| map[x] = 1; |
| map += active_map_size_.width(); |
| } |
| } |
| } |
| |
| void WebrtcVideoEncoderVpx::UpdateRegionFromActiveMap( |
| webrtc::DesktopRegion* updated_region) { |
| const uint8_t* map = active_map_.get(); |
| for (int y = 0; y < active_map_size_.height(); ++y) { |
| for (int x0 = 0; x0 < active_map_size_.width();) { |
| int x1 = x0; |
| for (; x1 < active_map_size_.width(); ++x1) { |
| if (map[y * active_map_size_.width() + x1] == 0) |
| break; |
| } |
| if (x1 > x0) { |
| updated_region->AddRect(webrtc::DesktopRect::MakeLTRB( |
| kMacroBlockSize * x0, kMacroBlockSize * y, kMacroBlockSize * x1, |
| kMacroBlockSize * (y + 1))); |
| } |
| x0 = x1 + 1; |
| } |
| } |
| updated_region->IntersectWith( |
| webrtc::DesktopRect::MakeWH(image_->w, image_->h)); |
| } |
| |
| } // namespace remoting |