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-rw-r--r--dom/media/encoder/VP8TrackEncoder.cpp720
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diff --git a/dom/media/encoder/VP8TrackEncoder.cpp b/dom/media/encoder/VP8TrackEncoder.cpp
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+++ b/dom/media/encoder/VP8TrackEncoder.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "VP8TrackEncoder.h"
+
+#include "DriftCompensation.h"
+#include "ImageToI420.h"
+#include "mozilla/gfx/2D.h"
+#include "prsystem.h"
+#include "VideoSegment.h"
+#include "VideoUtils.h"
+#include "vpx/vp8cx.h"
+#include "vpx/vpx_encoder.h"
+#include "WebMWriter.h"
+#include "mozilla/media/MediaUtils.h"
+#include "mozilla/dom/ImageUtils.h"
+#include "mozilla/dom/ImageBitmapBinding.h"
+#include "mozilla/ProfilerLabels.h"
+
+namespace mozilla {
+
+LazyLogModule gVP8TrackEncoderLog("VP8TrackEncoder");
+#define VP8LOG(level, msg, ...) \
+ MOZ_LOG(gVP8TrackEncoderLog, level, (msg, ##__VA_ARGS__))
+
+constexpr int DEFAULT_BITRATE_BPS = 2500000;
+constexpr int DEFAULT_KEYFRAME_INTERVAL_MS = 10000;
+constexpr int DYNAMIC_MAXKFDIST_CHECK_INTERVAL = 5;
+constexpr float DYNAMIC_MAXKFDIST_DIFFACTOR = 0.4;
+constexpr float DYNAMIC_MAXKFDIST_KFINTERVAL_FACTOR = 0.75;
+constexpr int I420_STRIDE_ALIGN = 16;
+
+using namespace mozilla::gfx;
+using namespace mozilla::layers;
+using namespace mozilla::media;
+using namespace mozilla::dom;
+
+namespace {
+
+template <int N>
+static int Aligned(int aValue) {
+ if (aValue < N) {
+ return N;
+ }
+
+ // The `- 1` avoids overreaching when `aValue % N == 0`.
+ return (((aValue - 1) / N) + 1) * N;
+}
+
+template <int Alignment>
+size_t I420Size(int aWidth, int aHeight) {
+ int yStride = Aligned<Alignment>(aWidth);
+ int yHeight = aHeight;
+ size_t yPlaneSize = yStride * yHeight;
+
+ int uvStride = Aligned<Alignment>((aWidth + 1) / 2);
+ int uvHeight = (aHeight + 1) / 2;
+ size_t uvPlaneSize = uvStride * uvHeight;
+
+ return yPlaneSize + uvPlaneSize * 2;
+}
+
+nsresult CreateEncoderConfig(int32_t aWidth, int32_t aHeight,
+ uint32_t aVideoBitrate, TrackRate aTrackRate,
+ int32_t aMaxKeyFrameDistance,
+ vpx_codec_enc_cfg_t* config) {
+ // Encoder configuration structure.
+ memset(config, 0, sizeof(vpx_codec_enc_cfg_t));
+ if (vpx_codec_enc_config_default(vpx_codec_vp8_cx(), config, 0)) {
+ VP8LOG(LogLevel::Error, "Failed to get default configuration");
+ return NS_ERROR_FAILURE;
+ }
+
+ config->g_w = aWidth;
+ config->g_h = aHeight;
+ // TODO: Maybe we should have various aFrameRate bitrate pair for each
+ // devices? or for different platform
+
+ // rc_target_bitrate needs kbit/s
+ config->rc_target_bitrate = std::max(
+ 1U, (aVideoBitrate != 0 ? aVideoBitrate : DEFAULT_BITRATE_BPS) / 1000);
+
+ // Setting the time base of the codec
+ config->g_timebase.num = 1;
+ config->g_timebase.den = aTrackRate;
+
+ // No error resilience as this is not intended for UDP transports
+ config->g_error_resilient = 0;
+
+ // Allow some frame lagging for large timeslices (when low latency is not
+ // needed)
+ /*std::min(10U, mKeyFrameInterval / 200)*/
+ config->g_lag_in_frames = 0;
+
+ int32_t number_of_cores = PR_GetNumberOfProcessors();
+ if (aWidth * aHeight > 1920 * 1080 && number_of_cores >= 8) {
+ config->g_threads = 4; // 4 threads for > 1080p.
+ } else if (aWidth * aHeight > 1280 * 960 && number_of_cores >= 6) {
+ config->g_threads = 3; // 3 threads for 1080p.
+ } else if (aWidth * aHeight > 640 * 480 && number_of_cores >= 3) {
+ config->g_threads = 2; // 2 threads for qHD/HD.
+ } else {
+ config->g_threads = 1; // 1 thread for VGA or less
+ }
+
+ // rate control settings
+
+ // No frame dropping
+ config->rc_dropframe_thresh = 0;
+ // Variable bitrate
+ config->rc_end_usage = VPX_VBR;
+ // Single pass encoding
+ config->g_pass = VPX_RC_ONE_PASS;
+ // ffmpeg doesn't currently support streams that use resize.
+ // Therefore, for safety, we should turn it off until it does.
+ config->rc_resize_allowed = 0;
+ // Allows 100% under target bitrate to compensate for prior overshoot
+ config->rc_undershoot_pct = 100;
+ // Allows 15% over target bitrate to compensate for prior undershoot
+ config->rc_overshoot_pct = 15;
+ // Tells the decoding application to buffer 500ms before beginning playback
+ config->rc_buf_initial_sz = 500;
+ // The decoding application will try to keep 600ms of buffer during playback
+ config->rc_buf_optimal_sz = 600;
+ // The decoding application may buffer 1000ms worth of encoded data
+ config->rc_buf_sz = 1000;
+
+ // We set key frame interval to automatic and try to set kf_max_dist so that
+ // the encoder chooses to put keyframes slightly more often than
+ // mKeyFrameInterval (which will encode with VPX_EFLAG_FORCE_KF when reached).
+ config->kf_mode = VPX_KF_AUTO;
+ config->kf_max_dist = aMaxKeyFrameDistance;
+
+ return NS_OK;
+}
+} // namespace
+
+VP8TrackEncoder::VP8TrackEncoder(RefPtr<DriftCompensator> aDriftCompensator,
+ TrackRate aTrackRate,
+ MediaQueue<EncodedFrame>& aEncodedDataQueue,
+ FrameDroppingMode aFrameDroppingMode,
+ Maybe<float> aKeyFrameIntervalFactor)
+ : VideoTrackEncoder(std::move(aDriftCompensator), aTrackRate,
+ aEncodedDataQueue, aFrameDroppingMode),
+ mKeyFrameInterval(
+ TimeDuration::FromMilliseconds(DEFAULT_KEYFRAME_INTERVAL_MS)),
+ mKeyFrameIntervalFactor(aKeyFrameIntervalFactor.valueOr(
+ DYNAMIC_MAXKFDIST_KFINTERVAL_FACTOR)) {
+ MOZ_COUNT_CTOR(VP8TrackEncoder);
+ CalculateMaxKeyFrameDistance().apply(
+ [&](auto aKfd) { SetMaxKeyFrameDistance(aKfd); });
+}
+
+VP8TrackEncoder::~VP8TrackEncoder() {
+ Destroy();
+ MOZ_COUNT_DTOR(VP8TrackEncoder);
+}
+
+void VP8TrackEncoder::Destroy() {
+ if (mInitialized) {
+ vpx_codec_destroy(&mVPXContext);
+ }
+
+ mInitialized = false;
+}
+
+Maybe<int32_t> VP8TrackEncoder::CalculateMaxKeyFrameDistance(
+ Maybe<float> aEstimatedFrameRate /* = Nothing() */) const {
+ if (!aEstimatedFrameRate && mMeanFrameDuration.empty()) {
+ // Not enough data to make a new calculation.
+ return Nothing();
+ }
+
+ // Calculate an estimation of our current framerate
+ const float estimatedFrameRate = aEstimatedFrameRate.valueOrFrom(
+ [&] { return 1.0f / mMeanFrameDuration.mean().ToSeconds(); });
+ // Set a kf_max_dist that should avoid triggering the VPX_EFLAG_FORCE_KF flag
+ return Some(std::max(
+ 1, static_cast<int32_t>(estimatedFrameRate * mKeyFrameIntervalFactor *
+ mKeyFrameInterval.ToSeconds())));
+}
+
+void VP8TrackEncoder::SetMaxKeyFrameDistance(int32_t aMaxKeyFrameDistance) {
+ if (mInitialized) {
+ VP8LOG(
+ LogLevel::Debug,
+ "%p SetMaxKeyFrameDistance() set kf_max_dist to %d based on estimated "
+ "framerate %.2ffps keyframe-factor %.2f and keyframe-interval %.2fs",
+ this, aMaxKeyFrameDistance, 1 / mMeanFrameDuration.mean().ToSeconds(),
+ mKeyFrameIntervalFactor, mKeyFrameInterval.ToSeconds());
+ DebugOnly<nsresult> rv =
+ Reconfigure(mFrameWidth, mFrameHeight, aMaxKeyFrameDistance);
+ MOZ_ASSERT(
+ NS_SUCCEEDED(rv),
+ "Reconfig for new key frame distance with proven size should succeed");
+ } else {
+ VP8LOG(LogLevel::Debug, "%p SetMaxKeyFrameDistance() distance=%d", this,
+ aMaxKeyFrameDistance);
+ mMaxKeyFrameDistance = Some(aMaxKeyFrameDistance);
+ }
+}
+
+nsresult VP8TrackEncoder::Init(int32_t aWidth, int32_t aHeight,
+ int32_t aDisplayWidth, int32_t aDisplayHeight,
+ float aEstimatedFrameRate) {
+ if (aDisplayWidth < 1 || aDisplayHeight < 1) {
+ return NS_ERROR_FAILURE;
+ }
+
+ if (aEstimatedFrameRate <= 0) {
+ return NS_ERROR_FAILURE;
+ }
+
+ int32_t maxKeyFrameDistance =
+ *CalculateMaxKeyFrameDistance(Some(aEstimatedFrameRate));
+
+ nsresult rv = InitInternal(aWidth, aHeight, maxKeyFrameDistance);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ MOZ_ASSERT(!mI420Frame);
+ MOZ_ASSERT(mI420FrameSize == 0);
+ const size_t neededSize = I420Size<I420_STRIDE_ALIGN>(aWidth, aHeight);
+ mI420Frame.reset(new (fallible) uint8_t[neededSize]);
+ mI420FrameSize = mI420Frame ? neededSize : 0;
+ if (!mI420Frame) {
+ VP8LOG(LogLevel::Warning, "Allocating I420 frame of size %zu failed",
+ neededSize);
+ return NS_ERROR_FAILURE;
+ }
+ vpx_img_wrap(&mVPXImageWrapper, VPX_IMG_FMT_I420, aWidth, aHeight,
+ I420_STRIDE_ALIGN, mI420Frame.get());
+
+ if (!mMetadata) {
+ mMetadata = MakeAndAddRef<VP8Metadata>();
+ mMetadata->mWidth = aWidth;
+ mMetadata->mHeight = aHeight;
+ mMetadata->mDisplayWidth = aDisplayWidth;
+ mMetadata->mDisplayHeight = aDisplayHeight;
+
+ VP8LOG(LogLevel::Info,
+ "%p Init() created metadata. width=%d, height=%d, displayWidth=%d, "
+ "displayHeight=%d, framerate=%.2f",
+ this, mMetadata->mWidth, mMetadata->mHeight,
+ mMetadata->mDisplayWidth, mMetadata->mDisplayHeight,
+ aEstimatedFrameRate);
+
+ SetInitialized();
+ }
+
+ return NS_OK;
+}
+
+nsresult VP8TrackEncoder::InitInternal(int32_t aWidth, int32_t aHeight,
+ int32_t aMaxKeyFrameDistance) {
+ if (aWidth < 1 || aHeight < 1) {
+ return NS_ERROR_FAILURE;
+ }
+
+ if (mInitialized) {
+ MOZ_ASSERT(false);
+ return NS_ERROR_FAILURE;
+ }
+
+ VP8LOG(LogLevel::Debug,
+ "%p InitInternal(). width=%d, height=%d, kf_max_dist=%d", this, aWidth,
+ aHeight, aMaxKeyFrameDistance);
+
+ // Encoder configuration structure.
+ vpx_codec_enc_cfg_t config;
+ nsresult rv = CreateEncoderConfig(aWidth, aHeight, mVideoBitrate, mTrackRate,
+ aMaxKeyFrameDistance, &config);
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
+
+ vpx_codec_flags_t flags = 0;
+ flags |= VPX_CODEC_USE_OUTPUT_PARTITION;
+ if (vpx_codec_enc_init(&mVPXContext, vpx_codec_vp8_cx(), &config, flags)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ vpx_codec_control(&mVPXContext, VP8E_SET_STATIC_THRESHOLD, 1);
+ vpx_codec_control(&mVPXContext, VP8E_SET_CPUUSED, 15);
+ vpx_codec_control(&mVPXContext, VP8E_SET_TOKEN_PARTITIONS,
+ VP8_TWO_TOKENPARTITION);
+
+ mFrameWidth = aWidth;
+ mFrameHeight = aHeight;
+ mMaxKeyFrameDistance = Some(aMaxKeyFrameDistance);
+
+ return NS_OK;
+}
+
+nsresult VP8TrackEncoder::Reconfigure(int32_t aWidth, int32_t aHeight,
+ int32_t aMaxKeyFrameDistance) {
+ if (aWidth <= 0 || aHeight <= 0) {
+ MOZ_ASSERT(false);
+ return NS_ERROR_FAILURE;
+ }
+
+ if (!mInitialized) {
+ MOZ_ASSERT(false);
+ return NS_ERROR_FAILURE;
+ }
+
+ bool needsReInit = aMaxKeyFrameDistance != *mMaxKeyFrameDistance;
+
+ if (aWidth != mFrameWidth || aHeight != mFrameHeight) {
+ VP8LOG(LogLevel::Info, "Dynamic resolution change (%dx%d -> %dx%d).",
+ mFrameWidth, mFrameHeight, aWidth, aHeight);
+ const size_t neededSize = I420Size<I420_STRIDE_ALIGN>(aWidth, aHeight);
+ if (neededSize > mI420FrameSize) {
+ needsReInit = true;
+ mI420Frame.reset(new (fallible) uint8_t[neededSize]);
+ mI420FrameSize = mI420Frame ? neededSize : 0;
+ }
+ if (!mI420Frame) {
+ VP8LOG(LogLevel::Warning, "Allocating I420 frame of size %zu failed",
+ neededSize);
+ return NS_ERROR_FAILURE;
+ }
+ vpx_img_wrap(&mVPXImageWrapper, VPX_IMG_FMT_I420, aWidth, aHeight,
+ I420_STRIDE_ALIGN, mI420Frame.get());
+ }
+
+ if (needsReInit) {
+ Destroy();
+ mMaxKeyFrameDistance = Some(aMaxKeyFrameDistance);
+ nsresult rv = InitInternal(aWidth, aHeight, aMaxKeyFrameDistance);
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
+ mInitialized = true;
+ return NS_OK;
+ }
+
+ // Encoder configuration structure.
+ vpx_codec_enc_cfg_t config;
+ nsresult rv = CreateEncoderConfig(aWidth, aHeight, mVideoBitrate, mTrackRate,
+ aMaxKeyFrameDistance, &config);
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
+ // Set new configuration
+ if (vpx_codec_enc_config_set(&mVPXContext, &config) != VPX_CODEC_OK) {
+ VP8LOG(LogLevel::Error, "Failed to set new configuration");
+ return NS_ERROR_FAILURE;
+ }
+
+ mFrameWidth = aWidth;
+ mFrameHeight = aHeight;
+
+ return NS_OK;
+}
+
+already_AddRefed<TrackMetadataBase> VP8TrackEncoder::GetMetadata() {
+ AUTO_PROFILER_LABEL("VP8TrackEncoder::GetMetadata", OTHER);
+
+ MOZ_ASSERT(mInitialized);
+
+ if (!mInitialized) {
+ return nullptr;
+ }
+
+ MOZ_ASSERT(mMetadata);
+ return do_AddRef(mMetadata);
+}
+
+Result<RefPtr<EncodedFrame>, nsresult> VP8TrackEncoder::ExtractEncodedData() {
+ vpx_codec_iter_t iter = nullptr;
+ EncodedFrame::FrameType frameType = EncodedFrame::VP8_P_FRAME;
+ auto frameData = MakeRefPtr<EncodedFrame::FrameData>();
+ const vpx_codec_cx_pkt_t* pkt = nullptr;
+ while ((pkt = vpx_codec_get_cx_data(&mVPXContext, &iter)) != nullptr) {
+ switch (pkt->kind) {
+ case VPX_CODEC_CX_FRAME_PKT: {
+ // Copy the encoded data from libvpx to frameData
+ frameData->AppendElements((uint8_t*)pkt->data.frame.buf,
+ pkt->data.frame.sz);
+ break;
+ }
+ default: {
+ break;
+ }
+ }
+ // End of frame
+ if ((pkt->data.frame.flags & VPX_FRAME_IS_FRAGMENT) == 0) {
+ if (pkt->data.frame.flags & VPX_FRAME_IS_KEY) {
+ frameType = EncodedFrame::VP8_I_FRAME;
+ }
+ break;
+ }
+ }
+
+ if (frameData->IsEmpty()) {
+ return RefPtr<EncodedFrame>(nullptr);
+ }
+
+ if (!pkt) {
+ // This check silences a coverity warning about accessing a null pkt below.
+ return RefPtr<EncodedFrame>(nullptr);
+ }
+
+ if (pkt->data.frame.flags & VPX_FRAME_IS_KEY) {
+ // Update the since-last-keyframe counter, and account for this frame's
+ // time.
+ TrackTime frameTime = pkt->data.frame.pts;
+ DebugOnly<TrackTime> frameDuration = pkt->data.frame.duration;
+ MOZ_ASSERT(frameTime + frameDuration <= mEncodedTimestamp);
+ mDurationSinceLastKeyframe =
+ std::min(mDurationSinceLastKeyframe, mEncodedTimestamp - frameTime);
+ }
+
+ // Convert the timestamp and duration to Usecs.
+ media::TimeUnit timestamp = media::TimeUnit(pkt->data.frame.pts, mTrackRate);
+ if (!timestamp.IsValid()) {
+ NS_ERROR("Microsecond timestamp overflow");
+ return Err(NS_ERROR_DOM_MEDIA_OVERFLOW_ERR);
+ }
+
+ mExtractedDuration += pkt->data.frame.duration;
+ if (!mExtractedDuration.isValid()) {
+ NS_ERROR("Duration overflow");
+ return Err(NS_ERROR_DOM_MEDIA_OVERFLOW_ERR);
+ }
+
+ media::TimeUnit totalDuration =
+ media::TimeUnit(mExtractedDuration.value(), mTrackRate);
+ if (!totalDuration.IsValid()) {
+ NS_ERROR("Duration overflow");
+ return Err(NS_ERROR_DOM_MEDIA_OVERFLOW_ERR);
+ }
+
+ media::TimeUnit duration = totalDuration - mExtractedDurationUs;
+ if (!duration.IsValid()) {
+ NS_ERROR("Duration overflow");
+ return Err(NS_ERROR_DOM_MEDIA_OVERFLOW_ERR);
+ }
+
+ mExtractedDurationUs = totalDuration;
+
+ VP8LOG(LogLevel::Verbose,
+ "ExtractEncodedData TimeStamp %.2f, Duration %.2f, FrameType %d",
+ timestamp.ToSeconds(), duration.ToSeconds(), frameType);
+
+ if (static_cast<int>(totalDuration.ToSeconds()) /
+ DYNAMIC_MAXKFDIST_CHECK_INTERVAL >
+ static_cast<int>(mLastKeyFrameDistanceUpdate.ToSeconds()) /
+ DYNAMIC_MAXKFDIST_CHECK_INTERVAL) {
+ // The interval has passed since the last keyframe update. Update again.
+ mLastKeyFrameDistanceUpdate = totalDuration;
+ const int32_t maxKfDistance =
+ CalculateMaxKeyFrameDistance().valueOr(*mMaxKeyFrameDistance);
+ const float diffFactor =
+ static_cast<float>(maxKfDistance) / *mMaxKeyFrameDistance;
+ VP8LOG(LogLevel::Debug, "maxKfDistance: %d, factor: %.2f", maxKfDistance,
+ diffFactor);
+ if (std::abs(1.0 - diffFactor) > DYNAMIC_MAXKFDIST_DIFFACTOR) {
+ SetMaxKeyFrameDistance(maxKfDistance);
+ }
+ }
+
+ return MakeRefPtr<EncodedFrame>(timestamp, duration.ToMicroseconds(),
+ PR_USEC_PER_SEC, frameType,
+ std::move(frameData));
+}
+
+/**
+ * Encoding flow in Encode():
+ * 1: Assert valid state.
+ * 2: Encode the video chunks in mSourceSegment in a for-loop.
+ * 2.1: The duration is taken straight from the video chunk's duration.
+ * 2.2: Setup the video chunk with mVPXImageWrapper by PrepareRawFrame().
+ * 2.3: Pass frame to vp8 encoder by vpx_codec_encode().
+ * 2.4: Extract the encoded frame from encoder by ExtractEncodedData().
+ * 2.5: Set the nextEncodeOperation for the next frame.
+ * 2.6: If we are not skipping the next frame, add the encoded frame to
+ * mEncodedDataQueue. If we are skipping the next frame, extend the encoded
+ * frame's duration in the next run of the loop.
+ * 3. Clear aSegment.
+ */
+nsresult VP8TrackEncoder::Encode(VideoSegment* aSegment) {
+ MOZ_ASSERT(mInitialized);
+ MOZ_ASSERT(!IsEncodingComplete());
+
+ AUTO_PROFILER_LABEL("VP8TrackEncoder::Encode", OTHER);
+
+ EncodeOperation nextEncodeOperation = ENCODE_NORMAL_FRAME;
+
+ RefPtr<EncodedFrame> encodedFrame;
+ for (VideoSegment::ChunkIterator iter(*aSegment); !iter.IsEnded();
+ iter.Next()) {
+ VideoChunk& chunk = *iter;
+
+ VP8LOG(LogLevel::Verbose,
+ "nextEncodeOperation is %d for frame of duration %" PRId64,
+ nextEncodeOperation, chunk.GetDuration());
+
+ TimeStamp timebase = TimeStamp::Now();
+
+ // Encode frame.
+ if (nextEncodeOperation != SKIP_FRAME) {
+ MOZ_ASSERT(!encodedFrame);
+ nsresult rv = PrepareRawFrame(chunk);
+ NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
+
+ // Encode the data with VP8 encoder
+ int flags = 0;
+ if (nextEncodeOperation == ENCODE_I_FRAME) {
+ VP8LOG(LogLevel::Warning,
+ "MediaRecorder lagging behind. Encoding keyframe.");
+ flags |= VPX_EFLAG_FORCE_KF;
+ }
+
+ // Sum duration of non-key frames and force keyframe if exceeded the
+ // given keyframe interval
+ if (mKeyFrameInterval > TimeDuration::FromSeconds(0)) {
+ if (media::TimeUnit(mDurationSinceLastKeyframe, mTrackRate)
+ .ToTimeDuration() >= mKeyFrameInterval) {
+ VP8LOG(LogLevel::Warning,
+ "Reached mKeyFrameInterval without seeing a keyframe. Forcing "
+ "one. time: %.2f, interval: %.2f",
+ media::TimeUnit(mDurationSinceLastKeyframe, mTrackRate)
+ .ToSeconds(),
+ mKeyFrameInterval.ToSeconds());
+ mDurationSinceLastKeyframe = 0;
+ flags |= VPX_EFLAG_FORCE_KF;
+ }
+ mDurationSinceLastKeyframe += chunk.GetDuration();
+ }
+
+ if (vpx_codec_encode(&mVPXContext, &mVPXImageWrapper, mEncodedTimestamp,
+ (unsigned long)chunk.GetDuration(), flags,
+ VPX_DL_REALTIME)) {
+ VP8LOG(LogLevel::Error, "vpx_codec_encode failed to encode the frame.");
+ return NS_ERROR_FAILURE;
+ }
+
+ // Move forward the mEncodedTimestamp.
+ mEncodedTimestamp += chunk.GetDuration();
+
+ // Extract the encoded data from the underlying encoder and push it to
+ // mEncodedDataQueue.
+ auto result = ExtractEncodedData();
+ if (result.isErr()) {
+ VP8LOG(LogLevel::Error, "ExtractEncodedData failed.");
+ return NS_ERROR_FAILURE;
+ }
+
+ MOZ_ASSERT(result.inspect(),
+ "We expected a frame here. EOS is handled explicitly later");
+ encodedFrame = result.unwrap();
+ } else {
+ // SKIP_FRAME
+
+ MOZ_DIAGNOSTIC_ASSERT(encodedFrame);
+
+ if (mKeyFrameInterval > TimeDuration::FromSeconds(0)) {
+ mDurationSinceLastKeyframe += chunk.GetDuration();
+ }
+
+ // Move forward the mEncodedTimestamp.
+ mEncodedTimestamp += chunk.GetDuration();
+
+ // Extend the duration of the last encoded frame in mEncodedDataQueue
+ // because this frame will be skipped.
+ VP8LOG(LogLevel::Warning,
+ "MediaRecorder lagging behind. Skipping a frame.");
+
+ mExtractedDuration += chunk.mDuration;
+ if (!mExtractedDuration.isValid()) {
+ NS_ERROR("skipped duration overflow");
+ return NS_ERROR_DOM_MEDIA_OVERFLOW_ERR;
+ }
+
+ media::TimeUnit totalDuration =
+ media::TimeUnit(mExtractedDuration.value(), mTrackRate);
+ media::TimeUnit skippedDuration = totalDuration - mExtractedDurationUs;
+ mExtractedDurationUs = totalDuration;
+ if (!skippedDuration.IsValid()) {
+ NS_ERROR("skipped duration overflow");
+ return NS_ERROR_DOM_MEDIA_OVERFLOW_ERR;
+ }
+
+ encodedFrame = MakeRefPtr<EncodedFrame>(
+ encodedFrame->mTime,
+ encodedFrame->mDuration + skippedDuration.ToMicroseconds(),
+ encodedFrame->mDurationBase, encodedFrame->mFrameType,
+ encodedFrame->mFrameData);
+ }
+
+ mMeanFrameEncodeDuration.insert(TimeStamp::Now() - timebase);
+ mMeanFrameDuration.insert(
+ media::TimeUnit(chunk.GetDuration(), mTrackRate).ToTimeDuration());
+ nextEncodeOperation = GetNextEncodeOperation(
+ mMeanFrameEncodeDuration.mean(), mMeanFrameDuration.mean());
+
+ if (nextEncodeOperation != SKIP_FRAME) {
+ // Note that the next operation might be SKIP_FRAME even if there is no
+ // next frame.
+ mEncodedDataQueue.Push(encodedFrame.forget());
+ }
+ }
+
+ if (encodedFrame) {
+ // Push now if we ended on a SKIP_FRAME before.
+ mEncodedDataQueue.Push(encodedFrame.forget());
+ }
+
+ // Remove the chunks we have processed.
+ aSegment->Clear();
+
+ if (mEndOfStream) {
+ // EOS: Extract the remaining frames from the underlying encoder.
+ VP8LOG(LogLevel::Debug, "mEndOfStream is true");
+ // No more frames will be encoded. Clearing temporary frames saves some
+ // memory.
+ if (mI420Frame) {
+ mI420Frame = nullptr;
+ mI420FrameSize = 0;
+ }
+ // mMuteFrame must be released before gfx shutdown. We do it now since it
+ // may be too late when this VP8TrackEncoder gets destroyed.
+ mMuteFrame = nullptr;
+ // Bug 1243611, keep calling vpx_codec_encode and vpx_codec_get_cx_data
+ // until vpx_codec_get_cx_data return null.
+ while (true) {
+ if (vpx_codec_encode(&mVPXContext, nullptr, mEncodedTimestamp, 0, 0,
+ VPX_DL_REALTIME)) {
+ return NS_ERROR_FAILURE;
+ }
+ auto result = ExtractEncodedData();
+ if (result.isErr()) {
+ return NS_ERROR_FAILURE;
+ }
+ if (!result.inspect()) {
+ // Null means end-of-stream.
+ break;
+ }
+ mEncodedDataQueue.Push(result.unwrap().forget());
+ }
+ mEncodedDataQueue.Finish();
+ }
+
+ return NS_OK;
+}
+
+nsresult VP8TrackEncoder::PrepareRawFrame(VideoChunk& aChunk) {
+ gfx::IntSize intrinsicSize = aChunk.mFrame.GetIntrinsicSize();
+ RefPtr<Image> img;
+ if (aChunk.mFrame.GetForceBlack() || aChunk.IsNull()) {
+ if (!mMuteFrame || mMuteFrame->GetSize() != intrinsicSize) {
+ mMuteFrame = mozilla::VideoFrame::CreateBlackImage(intrinsicSize);
+ }
+ if (!mMuteFrame) {
+ VP8LOG(LogLevel::Warning, "Failed to allocate black image of size %dx%d",
+ intrinsicSize.width, intrinsicSize.height);
+ return NS_OK;
+ }
+ img = mMuteFrame;
+ } else {
+ img = aChunk.mFrame.GetImage();
+ }
+
+ gfx::IntSize imgSize = img->GetSize();
+ if (imgSize != IntSize(mFrameWidth, mFrameHeight)) {
+ nsresult rv =
+ Reconfigure(imgSize.width, imgSize.height, *mMaxKeyFrameDistance);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+
+ MOZ_ASSERT(mFrameWidth == imgSize.width);
+ MOZ_ASSERT(mFrameHeight == imgSize.height);
+
+ nsresult rv = ConvertToI420(img, mVPXImageWrapper.planes[VPX_PLANE_Y],
+ mVPXImageWrapper.stride[VPX_PLANE_Y],
+ mVPXImageWrapper.planes[VPX_PLANE_U],
+ mVPXImageWrapper.stride[VPX_PLANE_U],
+ mVPXImageWrapper.planes[VPX_PLANE_V],
+ mVPXImageWrapper.stride[VPX_PLANE_V]);
+ if (NS_FAILED(rv)) {
+ VP8LOG(LogLevel::Error, "Converting to I420 failed");
+ return rv;
+ }
+
+ return NS_OK;
+}
+
+// These two define value used in GetNextEncodeOperation to determine the
+// EncodeOperation for next target frame.
+#define I_FRAME_RATIO (0.85) // Effectively disabled, because perceived quality
+#define SKIP_FRAME_RATIO (0.85)
+
+/**
+ * Compares the elapsed time from the beginning of GetEncodedTrack and
+ * the processed frame duration in mSourceSegment
+ * in order to set the nextEncodeOperation for next target frame.
+ */
+VP8TrackEncoder::EncodeOperation VP8TrackEncoder::GetNextEncodeOperation(
+ TimeDuration aTimeElapsed, TimeDuration aProcessedDuration) {
+ if (mFrameDroppingMode == FrameDroppingMode::DISALLOW) {
+ return ENCODE_NORMAL_FRAME;
+ }
+
+ if (aTimeElapsed.ToSeconds() >
+ aProcessedDuration.ToSeconds() * SKIP_FRAME_RATIO) {
+ // The encoder is too slow.
+ // We should skip next frame to consume the mSourceSegment.
+ return SKIP_FRAME;
+ }
+
+ if (aTimeElapsed.ToSeconds() >
+ aProcessedDuration.ToSeconds() * I_FRAME_RATIO) {
+ // The encoder is a little slow.
+ // We force the encoder to encode an I-frame to accelerate.
+ return ENCODE_I_FRAME;
+ }
+
+ return ENCODE_NORMAL_FRAME;
+}
+
+} // namespace mozilla
+
+#undef VP8LOG