зеркало из https://github.com/mozilla/gecko-dev.git
555 строки
19 KiB
C++
555 строки
19 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "VP8TrackEncoder.h"
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#include "vpx/vp8cx.h"
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#include "vpx/vpx_encoder.h"
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#include "VideoSegment.h"
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#include "VideoUtils.h"
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#include "prsystem.h"
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#include "WebMWriter.h"
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#include "libyuv.h"
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#include "GeckoProfiler.h"
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namespace mozilla {
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PRLogModuleInfo* gVP8TrackEncoderLog;
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#define VP8LOG(msg, ...) MOZ_LOG(gVP8TrackEncoderLog, mozilla::LogLevel::Debug, \
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(msg, ##__VA_ARGS__))
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// Debug logging macro with object pointer and class name.
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#define DEFAULT_BITRATE_BPS 2500000
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#define DEFAULT_ENCODE_FRAMERATE 30
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using namespace mozilla::layers;
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VP8TrackEncoder::VP8TrackEncoder()
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: VideoTrackEncoder()
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, mEncodedFrameDuration(0)
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, mEncodedTimestamp(0)
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, mRemainingTicks(0)
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, mVPXContext(new vpx_codec_ctx_t())
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, mVPXImageWrapper(new vpx_image_t())
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{
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MOZ_COUNT_CTOR(VP8TrackEncoder);
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if (!gVP8TrackEncoderLog) {
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gVP8TrackEncoderLog = PR_NewLogModule("VP8TrackEncoder");
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}
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}
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VP8TrackEncoder::~VP8TrackEncoder()
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{
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if (mInitialized) {
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vpx_codec_destroy(mVPXContext);
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}
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if (mVPXImageWrapper) {
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vpx_img_free(mVPXImageWrapper);
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}
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MOZ_COUNT_DTOR(VP8TrackEncoder);
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}
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nsresult
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VP8TrackEncoder::Init(int32_t aWidth, int32_t aHeight, int32_t aDisplayWidth,
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int32_t aDisplayHeight,TrackRate aTrackRate)
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{
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if (aWidth < 1 || aHeight < 1 || aDisplayWidth < 1 || aDisplayHeight < 1
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|| aTrackRate <= 0) {
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return NS_ERROR_FAILURE;
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}
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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mTrackRate = aTrackRate;
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mEncodedFrameRate = DEFAULT_ENCODE_FRAMERATE;
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mEncodedFrameDuration = mTrackRate / mEncodedFrameRate;
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mFrameWidth = aWidth;
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mFrameHeight = aHeight;
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mDisplayWidth = aDisplayWidth;
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mDisplayHeight = aDisplayHeight;
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// Encoder configuration structure.
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vpx_codec_enc_cfg_t config;
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memset(&config, 0, sizeof(vpx_codec_enc_cfg_t));
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if (vpx_codec_enc_config_default(vpx_codec_vp8_cx(), &config, 0)) {
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return NS_ERROR_FAILURE;
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}
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// Creating a wrapper to the image - setting image data to NULL. Actual
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// pointer will be set in encode. Setting align to 1, as it is meaningless
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// (actual memory is not allocated).
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vpx_img_wrap(mVPXImageWrapper, VPX_IMG_FMT_I420,
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mFrameWidth, mFrameHeight, 1, nullptr);
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config.g_w = mFrameWidth;
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config.g_h = mFrameHeight;
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// TODO: Maybe we should have various aFrameRate bitrate pair for each devices?
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// or for different platform
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// rc_target_bitrate needs kbit/s
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config.rc_target_bitrate = (mVideoBitrate != 0 ? mVideoBitrate : DEFAULT_BITRATE_BPS)/1000;
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// Setting the time base of the codec
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config.g_timebase.num = 1;
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config.g_timebase.den = mTrackRate;
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config.g_error_resilient = 0;
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config.g_lag_in_frames = 0; // 0- no frame lagging
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int32_t number_of_cores = PR_GetNumberOfProcessors();
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if (mFrameWidth * mFrameHeight > 1280 * 960 && number_of_cores >= 6) {
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config.g_threads = 3; // 3 threads for 1080p.
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} else if (mFrameWidth * mFrameHeight > 640 * 480 && number_of_cores >= 3) {
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config.g_threads = 2; // 2 threads for qHD/HD.
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} else {
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config.g_threads = 1; // 1 thread for VGA or less
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}
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// rate control settings
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config.rc_dropframe_thresh = 0;
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config.rc_end_usage = VPX_CBR;
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config.g_pass = VPX_RC_ONE_PASS;
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config.rc_resize_allowed = 1;
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config.rc_undershoot_pct = 100;
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config.rc_overshoot_pct = 15;
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config.rc_buf_initial_sz = 500;
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config.rc_buf_optimal_sz = 600;
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config.rc_buf_sz = 1000;
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config.kf_mode = VPX_KF_AUTO;
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// Ensure that we can output one I-frame per second.
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config.kf_max_dist = mEncodedFrameRate;
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vpx_codec_flags_t flags = 0;
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flags |= VPX_CODEC_USE_OUTPUT_PARTITION;
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if (vpx_codec_enc_init(mVPXContext, vpx_codec_vp8_cx(), &config, flags)) {
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return NS_ERROR_FAILURE;
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}
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vpx_codec_control(mVPXContext, VP8E_SET_STATIC_THRESHOLD, 1);
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vpx_codec_control(mVPXContext, VP8E_SET_CPUUSED, -6);
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vpx_codec_control(mVPXContext, VP8E_SET_TOKEN_PARTITIONS,
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VP8_ONE_TOKENPARTITION);
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mInitialized = true;
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mon.NotifyAll();
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return NS_OK;
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}
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already_AddRefed<TrackMetadataBase>
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VP8TrackEncoder::GetMetadata()
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{
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PROFILER_LABEL("VP8TrackEncoder", "GetMetadata",
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js::ProfileEntry::Category::OTHER);
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{
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// Wait if mEncoder is not initialized.
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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while (!mCanceled && !mInitialized) {
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mon.Wait();
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}
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}
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if (mCanceled || mEncodingComplete) {
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return nullptr;
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}
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nsRefPtr<VP8Metadata> meta = new VP8Metadata();
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meta->mWidth = mFrameWidth;
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meta->mHeight = mFrameHeight;
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meta->mDisplayWidth = mDisplayWidth;
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meta->mDisplayHeight = mDisplayHeight;
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meta->mEncodedFrameRate = mEncodedFrameRate;
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return meta.forget();
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}
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nsresult
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VP8TrackEncoder::GetEncodedPartitions(EncodedFrameContainer& aData)
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{
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vpx_codec_iter_t iter = nullptr;
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EncodedFrame::FrameType frameType = EncodedFrame::VP8_P_FRAME;
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nsTArray<uint8_t> frameData;
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const vpx_codec_cx_pkt_t *pkt = nullptr;
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while ((pkt = vpx_codec_get_cx_data(mVPXContext, &iter)) != nullptr) {
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switch (pkt->kind) {
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case VPX_CODEC_CX_FRAME_PKT: {
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// Copy the encoded data from libvpx to frameData
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frameData.AppendElements((uint8_t*)pkt->data.frame.buf,
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pkt->data.frame.sz);
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break;
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}
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default: {
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break;
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}
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}
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// End of frame
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if ((pkt->data.frame.flags & VPX_FRAME_IS_FRAGMENT) == 0) {
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if (pkt->data.frame.flags & VPX_FRAME_IS_KEY) {
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frameType = EncodedFrame::VP8_I_FRAME;
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}
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break;
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}
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}
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if (!frameData.IsEmpty() &&
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(pkt->data.frame.pts == mEncodedTimestamp)) {
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// Copy the encoded data to aData.
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EncodedFrame* videoData = new EncodedFrame();
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videoData->SetFrameType(frameType);
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// Convert the timestamp and duration to Usecs.
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CheckedInt64 timestamp = FramesToUsecs(mEncodedTimestamp, mTrackRate);
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if (timestamp.isValid()) {
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videoData->SetTimeStamp(
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(uint64_t)FramesToUsecs(mEncodedTimestamp, mTrackRate).value());
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}
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CheckedInt64 duration = FramesToUsecs(pkt->data.frame.duration, mTrackRate);
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if (duration.isValid()) {
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videoData->SetDuration(
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(uint64_t)FramesToUsecs(pkt->data.frame.duration, mTrackRate).value());
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}
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videoData->SwapInFrameData(frameData);
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VP8LOG("GetEncodedPartitions TimeStamp %lld Duration %lld\n",
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videoData->GetTimeStamp(), videoData->GetDuration());
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VP8LOG("frameType %d\n", videoData->GetFrameType());
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aData.AppendEncodedFrame(videoData);
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}
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return NS_OK;
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}
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static bool isYUV420(const PlanarYCbCrImage::Data *aData)
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{
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if (aData->mYSize == aData->mCbCrSize * 2) {
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return true;
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}
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return false;
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}
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static bool isYUV422(const PlanarYCbCrImage::Data *aData)
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{
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if ((aData->mYSize.width == aData->mCbCrSize.width * 2) &&
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(aData->mYSize.height == aData->mCbCrSize.height)) {
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return true;
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}
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return false;
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}
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static bool isYUV444(const PlanarYCbCrImage::Data *aData)
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{
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if (aData->mYSize == aData->mCbCrSize) {
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return true;
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}
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return false;
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}
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nsresult VP8TrackEncoder::PrepareRawFrame(VideoChunk &aChunk)
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{
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nsRefPtr<Image> img;
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if (aChunk.mFrame.GetForceBlack() || aChunk.IsNull()) {
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if (!mMuteFrame) {
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mMuteFrame = VideoFrame::CreateBlackImage(gfxIntSize(mFrameWidth, mFrameHeight));
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MOZ_ASSERT(mMuteFrame);
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}
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img = mMuteFrame;
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} else {
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img = aChunk.mFrame.GetImage();
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}
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ImageFormat format = img->GetFormat();
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if (format != ImageFormat::PLANAR_YCBCR) {
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VP8LOG("Unsupported video format\n");
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return NS_ERROR_FAILURE;
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}
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// Cast away constness b/c some of the accessors are non-const
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PlanarYCbCrImage* yuv =
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const_cast<PlanarYCbCrImage *>(static_cast<const PlanarYCbCrImage *>(img.get()));
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// Big-time assumption here that this is all contiguous data coming
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// from getUserMedia or other sources.
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MOZ_ASSERT(yuv);
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if (!yuv->IsValid()) {
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NS_WARNING("PlanarYCbCrImage is not valid");
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return NS_ERROR_FAILURE;
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}
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const PlanarYCbCrImage::Data *data = yuv->GetData();
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if (isYUV420(data) && !data->mCbSkip) { // 420 planar
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mVPXImageWrapper->planes[VPX_PLANE_Y] = data->mYChannel;
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mVPXImageWrapper->planes[VPX_PLANE_U] = data->mCbChannel;
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mVPXImageWrapper->planes[VPX_PLANE_V] = data->mCrChannel;
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mVPXImageWrapper->stride[VPX_PLANE_Y] = data->mYStride;
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mVPXImageWrapper->stride[VPX_PLANE_U] = data->mCbCrStride;
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mVPXImageWrapper->stride[VPX_PLANE_V] = data->mCbCrStride;
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} else {
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uint32_t yPlaneSize = mFrameWidth * mFrameHeight;
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uint32_t halfWidth = (mFrameWidth + 1) / 2;
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uint32_t halfHeight = (mFrameHeight + 1) / 2;
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uint32_t uvPlaneSize = halfWidth * halfHeight;
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if (mI420Frame.IsEmpty()) {
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mI420Frame.SetLength(yPlaneSize + uvPlaneSize * 2);
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}
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MOZ_ASSERT(mI420Frame.Length() >= (yPlaneSize + uvPlaneSize * 2));
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uint8_t *y = mI420Frame.Elements();
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uint8_t *cb = mI420Frame.Elements() + yPlaneSize;
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uint8_t *cr = mI420Frame.Elements() + yPlaneSize + uvPlaneSize;
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if (isYUV420(data) && data->mCbSkip) {
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// If mCbSkip is set, we assume it's nv12 or nv21.
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if (data->mCbChannel < data->mCrChannel) { // nv12
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libyuv::NV12ToI420(data->mYChannel, data->mYStride,
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data->mCbChannel, data->mCbCrStride,
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y, mFrameWidth,
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cb, halfWidth,
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cr, halfWidth,
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mFrameWidth, mFrameHeight);
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} else { // nv21
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libyuv::NV21ToI420(data->mYChannel, data->mYStride,
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data->mCrChannel, data->mCbCrStride,
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y, mFrameWidth,
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cb, halfWidth,
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cr, halfWidth,
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mFrameWidth, mFrameHeight);
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}
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} else if (isYUV444(data) && !data->mCbSkip) {
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libyuv::I444ToI420(data->mYChannel, data->mYStride,
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data->mCbChannel, data->mCbCrStride,
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data->mCrChannel, data->mCbCrStride,
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y, mFrameWidth,
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cb, halfWidth,
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cr, halfWidth,
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mFrameWidth, mFrameHeight);
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} else if (isYUV422(data) && !data->mCbSkip) {
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libyuv::I422ToI420(data->mYChannel, data->mYStride,
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data->mCbChannel, data->mCbCrStride,
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data->mCrChannel, data->mCbCrStride,
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y, mFrameWidth,
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cb, halfWidth,
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cr, halfWidth,
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mFrameWidth, mFrameHeight);
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} else {
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VP8LOG("Unsupported planar format\n");
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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mVPXImageWrapper->planes[VPX_PLANE_Y] = y;
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mVPXImageWrapper->planes[VPX_PLANE_U] = cb;
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mVPXImageWrapper->planes[VPX_PLANE_V] = cr;
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mVPXImageWrapper->stride[VPX_PLANE_Y] = mFrameWidth;
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mVPXImageWrapper->stride[VPX_PLANE_U] = halfWidth;
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mVPXImageWrapper->stride[VPX_PLANE_V] = halfWidth;
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}
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return NS_OK;
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}
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// These two define value used in GetNextEncodeOperation to determine the
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// EncodeOperation for next target frame.
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#define I_FRAME_RATIO (0.5)
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#define SKIP_FRAME_RATIO (0.75)
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/**
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* Compares the elapsed time from the beginning of GetEncodedTrack and
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* the processed frame duration in mSourceSegment
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* in order to set the nextEncodeOperation for next target frame.
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*/
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VP8TrackEncoder::EncodeOperation
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VP8TrackEncoder::GetNextEncodeOperation(TimeDuration aTimeElapsed,
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StreamTime aProcessedDuration)
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{
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int64_t durationInUsec =
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FramesToUsecs(aProcessedDuration + mEncodedFrameDuration,
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mTrackRate).value();
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if (aTimeElapsed.ToMicroseconds() > (durationInUsec * SKIP_FRAME_RATIO)) {
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// The encoder is too slow.
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// We should skip next frame to consume the mSourceSegment.
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return SKIP_FRAME;
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} else if (aTimeElapsed.ToMicroseconds() > (durationInUsec * I_FRAME_RATIO)) {
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// The encoder is a little slow.
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// We force the encoder to encode an I-frame to accelerate.
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return ENCODE_I_FRAME;
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} else {
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return ENCODE_NORMAL_FRAME;
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}
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}
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StreamTime
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VP8TrackEncoder::CalculateRemainingTicks(StreamTime aDurationCopied,
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StreamTime aEncodedDuration)
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{
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return mRemainingTicks + aEncodedDuration - aDurationCopied;
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}
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// Try to extend the encodedDuration as long as possible if the target frame
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// has a long duration.
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StreamTime
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VP8TrackEncoder::CalculateEncodedDuration(StreamTime aDurationCopied)
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{
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StreamTime temp64 = aDurationCopied;
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StreamTime encodedDuration = mEncodedFrameDuration;
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temp64 -= mRemainingTicks;
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while (temp64 > mEncodedFrameDuration) {
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temp64 -= mEncodedFrameDuration;
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encodedDuration += mEncodedFrameDuration;
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}
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return encodedDuration;
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}
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/**
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* Encoding flow in GetEncodedTrack():
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* 1: Check the mInitialized state and the packet duration.
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* 2: Move the data from mRawSegment to mSourceSegment.
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* 3: Encode the video chunks in mSourceSegment in a for-loop.
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* 3.1: Pick the video chunk by mRemainingTicks.
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* 3.2: Calculate the encoding duration for the parameter of vpx_codec_encode().
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* The encoding duration is a multiple of mEncodedFrameDuration.
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* 3.3: Setup the video chunk to mVPXImageWrapper by PrepareRawFrame().
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* 3.4: Send frame into vp8 encoder by vpx_codec_encode().
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* 3.5: Get the output frame from encoder by calling GetEncodedPartitions().
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* 3.6: Calculate the mRemainingTicks for next target frame.
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* 3.7: Set the nextEncodeOperation for the next target frame.
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* There is a heuristic: If the frame duration we have processed in
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* mSourceSegment is 100ms, means that we can't spend more than 100ms to
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* encode it.
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* 4. Remove the encoded chunks in mSourceSegment after for-loop.
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*
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* Ex1: Input frame rate is 100 => input frame duration is 10ms for each.
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* mEncodedFrameRate is 30 => output frame duration is 33ms.
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* In this case, the frame duration in mSourceSegment will be:
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* 1st : 0~10ms
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* 2nd : 10~20ms
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* 3rd : 20~30ms
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* 4th : 30~40ms
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* ...
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* The VP8 encoder will take the 1st and 4th frames to encode. At beginning
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* mRemainingTicks is 0 for 1st frame, then the mRemainingTicks is set
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* to 23 to pick the 4th frame. (mEncodedFrameDuration - 1st frame duration)
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*
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* Ex2: Input frame rate is 25 => frame duration is 40ms for each.
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* mEncodedFrameRate is 30 => output frame duration is 33ms.
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* In this case, the frame duration in mSourceSegment will be:
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* 1st : 0~40ms
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* 2nd : 40~80ms
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* 3rd : 80~120ms
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* 4th : 120~160ms
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* ...
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* Because the input frame duration is 40ms larger than 33ms, so the first
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* encoded frame duration will be 66ms by calling CalculateEncodedDuration.
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* And the mRemainingTicks will be set to 26
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* (CalculateRemainingTicks 0+66-40) in order to pick the next frame(2nd)
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* in mSourceSegment.
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*/
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nsresult
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VP8TrackEncoder::GetEncodedTrack(EncodedFrameContainer& aData)
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{
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PROFILER_LABEL("VP8TrackEncoder", "GetEncodedTrack",
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js::ProfileEntry::Category::OTHER);
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bool EOS;
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{
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// Move all the samples from mRawSegment to mSourceSegment. We only hold
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// the monitor in this block.
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ReentrantMonitorAutoEnter mon(mReentrantMonitor);
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// Wait if mEncoder is not initialized, or when not enough raw data, but is
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// not the end of stream nor is being canceled.
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while (!mCanceled && (!mInitialized ||
|
|
(mRawSegment.GetDuration() + mSourceSegment.GetDuration() <
|
|
mEncodedFrameDuration && !mEndOfStream))) {
|
|
mon.Wait();
|
|
}
|
|
if (mCanceled || mEncodingComplete) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
mSourceSegment.AppendFrom(&mRawSegment);
|
|
EOS = mEndOfStream;
|
|
}
|
|
|
|
VideoSegment::ChunkIterator iter(mSourceSegment);
|
|
StreamTime durationCopied = 0;
|
|
StreamTime totalProcessedDuration = 0;
|
|
TimeStamp timebase = TimeStamp::Now();
|
|
EncodeOperation nextEncodeOperation = ENCODE_NORMAL_FRAME;
|
|
|
|
for (; !iter.IsEnded(); iter.Next()) {
|
|
VideoChunk &chunk = *iter;
|
|
// Accumulate chunk's duration to durationCopied until it reaches
|
|
// mRemainingTicks.
|
|
durationCopied += chunk.GetDuration();
|
|
MOZ_ASSERT(mRemainingTicks <= mEncodedFrameDuration);
|
|
VP8LOG("durationCopied %lld mRemainingTicks %lld\n",
|
|
durationCopied, mRemainingTicks);
|
|
if (durationCopied >= mRemainingTicks) {
|
|
VP8LOG("nextEncodeOperation is %d\n",nextEncodeOperation);
|
|
// Calculate encodedDuration for this target frame.
|
|
StreamTime encodedDuration = CalculateEncodedDuration(durationCopied);
|
|
|
|
// Encode frame.
|
|
if (nextEncodeOperation != SKIP_FRAME) {
|
|
nsresult rv = PrepareRawFrame(chunk);
|
|
NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
|
|
|
|
// Encode the data with VP8 encoder
|
|
int flags = (nextEncodeOperation == ENCODE_NORMAL_FRAME) ?
|
|
0 : VPX_EFLAG_FORCE_KF;
|
|
if (vpx_codec_encode(mVPXContext, mVPXImageWrapper, mEncodedTimestamp,
|
|
(unsigned long)encodedDuration, flags,
|
|
VPX_DL_REALTIME)) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
// Get the encoded data from VP8 encoder.
|
|
GetEncodedPartitions(aData);
|
|
} else {
|
|
// SKIP_FRAME
|
|
// Extend the duration of the last encoded data in aData
|
|
// because this frame will be skip.
|
|
nsRefPtr<EncodedFrame> last = nullptr;
|
|
last = aData.GetEncodedFrames().LastElement();
|
|
if (last) {
|
|
last->SetDuration(last->GetDuration() + encodedDuration);
|
|
}
|
|
}
|
|
// Move forward the mEncodedTimestamp.
|
|
mEncodedTimestamp += encodedDuration;
|
|
totalProcessedDuration += durationCopied;
|
|
// Calculate mRemainingTicks for next target frame.
|
|
mRemainingTicks = CalculateRemainingTicks(durationCopied,
|
|
encodedDuration);
|
|
|
|
// Check the remain data is enough for next target frame.
|
|
if (mSourceSegment.GetDuration() - totalProcessedDuration
|
|
>= mEncodedFrameDuration) {
|
|
TimeDuration elapsedTime = TimeStamp::Now() - timebase;
|
|
nextEncodeOperation = GetNextEncodeOperation(elapsedTime,
|
|
totalProcessedDuration);
|
|
// Reset durationCopied for next iteration.
|
|
durationCopied = 0;
|
|
} else {
|
|
// Process done, there is no enough data left for next iteration,
|
|
// break the for-loop.
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// Remove the chunks we have processed.
|
|
mSourceSegment.RemoveLeading(totalProcessedDuration);
|
|
VP8LOG("RemoveLeading %lld\n",totalProcessedDuration);
|
|
|
|
// End of stream, pull the rest frames in encoder.
|
|
if (EOS) {
|
|
VP8LOG("mEndOfStream is true\n");
|
|
mEncodingComplete = true;
|
|
if (vpx_codec_encode(mVPXContext, nullptr, mEncodedTimestamp,
|
|
mEncodedFrameDuration, 0, VPX_DL_REALTIME)) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
GetEncodedPartitions(aData);
|
|
}
|
|
|
|
return NS_OK ;
|
|
}
|
|
|
|
} // namespace mozilla
|