mirror of
https://github.com/microsoft/playwright.git
synced 2025-06-26 21:40:17 +00:00
363 lines
13 KiB
C++
363 lines
13 KiB
C++
/*
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* Copyright (c) 2010, The WebM Project authors. All rights reserved.
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* Copyright (c) 2013 The Chromium Authors. All rights reserved.
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* Copyright (C) 2020 Microsoft Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "ScreencastEncoder.h"
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#include <algorithm>
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#include <libyuv.h>
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#include <vpx/vp8.h>
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#include <vpx/vp8cx.h>
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#include <vpx/vpx_encoder.h>
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#include "nsThreadUtils.h"
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#include "WebMFileWriter.h"
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#include "webrtc/api/video/video_frame.h"
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namespace mozilla {
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namespace {
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// Defines the dimension of a macro block. This is used to compute the active
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// map for the encoder.
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const int kMacroBlockSize = 16;
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void createImage(unsigned int width, unsigned int height,
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std::unique_ptr<vpx_image_t>& out_image,
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std::unique_ptr<uint8_t[]>& out_image_buffer,
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int& out_buffer_size) {
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std::unique_ptr<vpx_image_t> image(new vpx_image_t());
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memset(image.get(), 0, sizeof(vpx_image_t));
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// libvpx seems to require both to be assigned.
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image->d_w = width;
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image->w = width;
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image->d_h = height;
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image->h = height;
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// I420
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image->fmt = VPX_IMG_FMT_YV12;
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image->x_chroma_shift = 1;
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image->y_chroma_shift = 1;
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// libyuv's fast-path requires 16-byte aligned pointers and strides, so pad
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// the Y, U and V planes' strides to multiples of 16 bytes.
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const int y_stride = ((image->w - 1) & ~15) + 16;
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const int uv_unaligned_stride = y_stride >> image->x_chroma_shift;
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const int uv_stride = ((uv_unaligned_stride - 1) & ~15) + 16;
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// libvpx accesses the source image in macro blocks, and will over-read
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// if the image is not padded out to the next macroblock: crbug.com/119633.
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// Pad the Y, U and V planes' height out to compensate.
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// Assuming macroblocks are 16x16, aligning the planes' strides above also
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// macroblock aligned them.
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static_assert(kMacroBlockSize == 16, "macroblock_size_not_16");
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const int y_rows = ((image->h - 1) & ~(kMacroBlockSize-1)) + kMacroBlockSize;
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const int uv_rows = y_rows >> image->y_chroma_shift;
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// Allocate a YUV buffer large enough for the aligned data & padding.
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out_buffer_size = y_stride * y_rows + 2*uv_stride * uv_rows;
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std::unique_ptr<uint8_t[]> image_buffer(new uint8_t[out_buffer_size]);
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// Reset image value to 128 so we just need to fill in the y plane.
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memset(image_buffer.get(), 128, out_buffer_size);
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// Fill in the information for |image_|.
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unsigned char* uchar_buffer =
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reinterpret_cast<unsigned char*>(image_buffer.get());
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image->planes[0] = uchar_buffer;
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image->planes[1] = image->planes[0] + y_stride * y_rows;
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image->planes[2] = image->planes[1] + uv_stride * uv_rows;
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image->stride[0] = y_stride;
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image->stride[1] = uv_stride;
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image->stride[2] = uv_stride;
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out_image = std::move(image);
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out_image_buffer = std::move(image_buffer);
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}
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} // namespace
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class ScreencastEncoder::VPXFrame {
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public:
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VPXFrame(rtc::scoped_refptr<webrtc::VideoFrameBuffer>&& buffer, Maybe<double> scale, int offsetTop)
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: m_frameBuffer(std::move(buffer))
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, m_scale(scale)
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, m_offsetTop(offsetTop)
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{ }
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void setDuration(int duration) { m_duration = duration; }
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int duration() const { return m_duration; }
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void convertToVpxImage(vpx_image_t* image)
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{
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if (m_frameBuffer->type() != webrtc::VideoFrameBuffer::Type::kI420) {
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fprintf(stderr, "convertToVpxImage unexpected frame buffer type: %d\n", m_frameBuffer->type());
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return;
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}
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auto src = m_frameBuffer->GetI420();
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const int y_stride = image->stride[0];
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MOZ_ASSERT(image->stride[1] == image->stride[2]);
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const int uv_stride = image->stride[1];
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uint8_t* y_data = image->planes[0];
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uint8_t* u_data = image->planes[1];
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uint8_t* v_data = image->planes[2];
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if (m_scale) {
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int src_width = src->width();
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double dst_width = src_width * m_scale.value();
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if (dst_width > image->w) {
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src_width *= image->w / dst_width;
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dst_width = image->w;
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}
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int src_height = src->height() - m_offsetTop;
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double dst_height = src_height * m_scale.value();
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if (dst_height > image->h) {
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src_height *= image->h / dst_height;
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dst_height = image->h;
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}
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libyuv::I420Scale(src->DataY() + m_offsetTop * src->StrideY(), src->StrideY(),
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src->DataU() + (m_offsetTop + 1) / 2 * src->StrideU(), src->StrideU(),
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src->DataV() + (m_offsetTop + 1) / 2 * src->StrideV(), src->StrideV(),
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src_width, src_height,
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y_data, y_stride,
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u_data, uv_stride,
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v_data, uv_stride,
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dst_width, dst_height,
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libyuv::kFilterBilinear);
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} else {
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int width = std::min<int>(image->w, src->width());
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int height = std::min<int>(image->h, src->height() - m_offsetTop);
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libyuv::I420Copy(src->DataY() + m_offsetTop * src->StrideY(), src->StrideY(),
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src->DataU() + (m_offsetTop + 1) / 2 * src->StrideU(), src->StrideU(),
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src->DataV() + (m_offsetTop + 1) / 2 * src->StrideV(), src->StrideV(),
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y_data, y_stride,
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u_data, uv_stride,
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v_data, uv_stride,
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width, height);
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}
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}
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private:
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rtc::scoped_refptr<webrtc::VideoFrameBuffer> m_frameBuffer;
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Maybe<double> m_scale;
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int m_offsetTop = 0;
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int m_duration = 0;
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};
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class ScreencastEncoder::VPXCodec {
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public:
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VPXCodec(vpx_codec_ctx_t codec, vpx_codec_enc_cfg_t cfg, FILE* file)
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: m_codec(codec)
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, m_cfg(cfg)
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, m_file(file)
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, m_writer(new WebMFileWriter(file, &m_cfg))
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{
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nsresult rv = NS_NewNamedThread("Screencast enc", getter_AddRefs(m_encoderQueue));
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if (rv != NS_OK) {
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fprintf(stderr, "ScreencastEncoder::VPXCodec failed to spawn thread %d\n", rv);
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return;
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}
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createImage(cfg.g_w, cfg.g_h, m_image, m_imageBuffer, m_imageBufferSize);
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}
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~VPXCodec() {
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m_encoderQueue->Shutdown();
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m_encoderQueue = nullptr;
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}
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void encodeFrameAsync(std::unique_ptr<VPXFrame>&& frame)
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{
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m_encoderQueue->Dispatch(NS_NewRunnableFunction("VPXCodec::encodeFrameAsync", [this, frame = std::move(frame)] {
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memset(m_imageBuffer.get(), 128, m_imageBufferSize);
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frame->convertToVpxImage(m_image.get());
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encodeFrame(m_image.get(), frame->duration());
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}));
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}
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void finishAsync(std::function<void()>&& callback)
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{
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m_encoderQueue->Dispatch(NS_NewRunnableFunction("VPXCodec::finishAsync", [this, callback = std::move(callback)] {
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finish();
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callback();
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}));
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}
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private:
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bool encodeFrame(vpx_image_t *img, int duration)
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{
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vpx_codec_iter_t iter = nullptr;
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const vpx_codec_cx_pkt_t *pkt = nullptr;
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int flags = 0;
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const vpx_codec_err_t res = vpx_codec_encode(&m_codec, img, m_pts, duration, flags, VPX_DL_REALTIME);
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if (res != VPX_CODEC_OK) {
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fprintf(stderr, "Failed to encode frame: %s\n", vpx_codec_error(&m_codec));
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return false;
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}
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bool gotPkts = false;
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while ((pkt = vpx_codec_get_cx_data(&m_codec, &iter)) != nullptr) {
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gotPkts = true;
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if (pkt->kind == VPX_CODEC_CX_FRAME_PKT) {
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m_writer->writeFrame(pkt);
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bool keyframe = (pkt->data.frame.flags & VPX_FRAME_IS_KEY) != 0;
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++m_frameCount;
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fprintf(stderr, " #%03d %spts=%" PRId64 " sz=%zd\n", m_frameCount, keyframe ? "[K] " : "", pkt->data.frame.pts, pkt->data.frame.sz);
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m_pts += pkt->data.frame.duration;
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}
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}
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return gotPkts;
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}
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void finish()
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{
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// Flush encoder.
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while (encodeFrame(nullptr, 1))
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++m_frameCount;
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m_writer->finish();
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fclose(m_file);
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fprintf(stderr, "ScreencastEncoder::finish %d frames\n", m_frameCount);
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}
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RefPtr<nsIThread> m_encoderQueue;
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vpx_codec_ctx_t m_codec;
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vpx_codec_enc_cfg_t m_cfg;
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FILE* m_file { nullptr };
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std::unique_ptr<WebMFileWriter> m_writer;
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int m_frameCount { 0 };
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int64_t m_pts { 0 };
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std::unique_ptr<uint8_t[]> m_imageBuffer;
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int m_imageBufferSize { 0 };
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std::unique_ptr<vpx_image_t> m_image;
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};
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ScreencastEncoder::ScreencastEncoder(std::unique_ptr<VPXCodec>&& vpxCodec, Maybe<double> scale, int offsetTop)
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: m_vpxCodec(std::move(vpxCodec))
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, m_scale(scale)
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, m_offsetTop(offsetTop)
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{
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}
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ScreencastEncoder::~ScreencastEncoder()
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{
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}
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static constexpr int fps = 24;
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RefPtr<ScreencastEncoder> ScreencastEncoder::create(nsCString& errorString, const nsCString& filePath, int width, int height, Maybe<double> scale, int offsetTop)
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{
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vpx_codec_iface_t* codec_interface = vpx_codec_vp8_cx();
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if (!codec_interface) {
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errorString = "Codec not found.";
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return nullptr;
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}
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if (width <= 0 || height <= 0 || (width % 2) != 0 || (height % 2) != 0) {
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errorString.AppendPrintf("Invalid frame size: %dx%d", width, height);
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return nullptr;
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}
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vpx_codec_enc_cfg_t cfg;
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memset(&cfg, 0, sizeof(cfg));
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vpx_codec_err_t error = vpx_codec_enc_config_default(codec_interface, &cfg, 0);
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if (error) {
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errorString.AppendPrintf("Failed to get default codec config: %s", vpx_codec_err_to_string(error));
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return nullptr;
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}
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cfg.g_w = width;
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cfg.g_h = height;
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cfg.g_timebase.num = 1;
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cfg.g_timebase.den = fps;
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cfg.g_error_resilient = VPX_ERROR_RESILIENT_DEFAULT;
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vpx_codec_ctx_t codec;
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if (vpx_codec_enc_init(&codec, codec_interface, &cfg, 0)) {
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errorString.AppendPrintf("Failed to initialize encoder: %s", vpx_codec_error(&codec));
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return nullptr;
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}
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FILE* file = fopen(filePath.get(), "wb");
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if (!file) {
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errorString.AppendPrintf("Failed to open file '%s' for writing: %s", filePath.get(), strerror(errno));
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return nullptr;
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}
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std::unique_ptr<VPXCodec> vpxCodec(new VPXCodec(codec, cfg, file));
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fprintf(stderr, "ScreencastEncoder initialized with: %s\n", vpx_codec_iface_name(codec_interface));
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return new ScreencastEncoder(std::move(vpxCodec), scale, offsetTop);
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}
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void ScreencastEncoder::flushLastFrame()
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{
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TimeStamp now = TimeStamp::Now();
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if (m_lastFrameTimestamp) {
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// If previous frame encoding failed for some rason leave the timestampt intact.
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if (!m_lastFrame)
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return;
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TimeDuration seconds = now - m_lastFrameTimestamp;
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int duration = 1 + seconds.ToSeconds() * fps; // Duration in timebase units
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m_lastFrame->setDuration(duration);
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m_vpxCodec->encodeFrameAsync(std::move(m_lastFrame));
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}
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m_lastFrameTimestamp = now;
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}
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void ScreencastEncoder::encodeFrame(const webrtc::VideoFrame& videoFrame)
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{
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fprintf(stderr, "ScreencastEncoder::encodeFrame\n");
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flushLastFrame();
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m_lastFrame = std::make_unique<VPXFrame>(videoFrame.video_frame_buffer(), m_scale, m_offsetTop);
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}
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void ScreencastEncoder::finish(std::function<void()>&& callback)
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{
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if (!m_vpxCodec) {
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callback();
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return;
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}
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flushLastFrame();
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m_vpxCodec->finishAsync([callback = std::move(callback)] () mutable {
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NS_DispatchToMainThread(NS_NewRunnableFunction("ScreencastEncoder::finish callback", std::move(callback)));
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});
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}
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} // namespace mozilla
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