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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /dom/media/webm/WebMDemuxer.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/media/webm/WebMDemuxer.cpp')
-rw-r--r--dom/media/webm/WebMDemuxer.cpp1361
1 files changed, 1361 insertions, 0 deletions
diff --git a/dom/media/webm/WebMDemuxer.cpp b/dom/media/webm/WebMDemuxer.cpp
new file mode 100644
index 0000000000..da14118205
--- /dev/null
+++ b/dom/media/webm/WebMDemuxer.cpp
@@ -0,0 +1,1361 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "nsError.h"
+#include "MediaResource.h"
+#ifdef MOZ_AV1
+# include "AOMDecoder.h"
+#endif
+#include "VPXDecoder.h"
+#include "WebMDemuxer.h"
+#include "WebMBufferedParser.h"
+#include "gfx2DGlue.h"
+#include "gfxUtils.h"
+#include "mozilla/EndianUtils.h"
+#include "mozilla/SharedThreadPool.h"
+#include "MediaDataDemuxer.h"
+#include "nsAutoRef.h"
+#include "NesteggPacketHolder.h"
+#include "XiphExtradata.h"
+#include "prprf.h" // leaving it for PR_vsnprintf()
+#include "mozilla/IntegerPrintfMacros.h"
+#include "mozilla/Sprintf.h"
+#include "VideoUtils.h"
+
+#include <algorithm>
+#include <numeric>
+#include <stdint.h>
+
+#define WEBM_DEBUG(arg, ...) \
+ DDMOZ_LOG(gMediaDemuxerLog, mozilla::LogLevel::Debug, "::%s: " arg, \
+ __func__, ##__VA_ARGS__)
+extern mozilla::LazyLogModule gMediaDemuxerLog;
+
+namespace mozilla {
+
+using namespace gfx;
+using media::TimeUnit;
+
+LazyLogModule gNesteggLog("Nestegg");
+
+// How far ahead will we look when searching future keyframe. In microseconds.
+// This value is based on what appears to be a reasonable value as most webm
+// files encountered appear to have keyframes located < 4s.
+#define MAX_LOOK_AHEAD 10000000
+
+// Functions for reading and seeking using WebMDemuxer required for
+// nestegg_io. The 'user data' passed to these functions is the
+// demuxer.
+static int webmdemux_read(void* aBuffer, size_t aLength, void* aUserData) {
+ MOZ_ASSERT(aUserData);
+ MOZ_ASSERT(aLength < UINT32_MAX);
+ WebMDemuxer::NestEggContext* context =
+ reinterpret_cast<WebMDemuxer::NestEggContext*>(aUserData);
+ uint32_t count = aLength;
+ if (context->IsMediaSource()) {
+ int64_t length = context->GetEndDataOffset();
+ int64_t position = context->GetResource()->Tell();
+ MOZ_ASSERT(position <= context->GetResource()->GetLength());
+ MOZ_ASSERT(position <= length);
+ if (length >= 0 && count + position > length) {
+ count = length - position;
+ }
+ MOZ_ASSERT(count <= aLength);
+ }
+ uint32_t bytes = 0;
+ nsresult rv =
+ context->GetResource()->Read(static_cast<char*>(aBuffer), count, &bytes);
+ bool eof = bytes < aLength;
+ return NS_FAILED(rv) ? -1 : eof ? 0 : 1;
+}
+
+static int webmdemux_seek(int64_t aOffset, int aWhence, void* aUserData) {
+ MOZ_ASSERT(aUserData);
+ WebMDemuxer::NestEggContext* context =
+ reinterpret_cast<WebMDemuxer::NestEggContext*>(aUserData);
+ nsresult rv = context->GetResource()->Seek(aWhence, aOffset);
+ return NS_SUCCEEDED(rv) ? 0 : -1;
+}
+
+static int64_t webmdemux_tell(void* aUserData) {
+ MOZ_ASSERT(aUserData);
+ WebMDemuxer::NestEggContext* context =
+ reinterpret_cast<WebMDemuxer::NestEggContext*>(aUserData);
+ return context->GetResource()->Tell();
+}
+
+static void webmdemux_log(nestegg* aContext, unsigned int aSeverity,
+ char const* aFormat, ...) {
+ if (!MOZ_LOG_TEST(gNesteggLog, LogLevel::Debug)) {
+ return;
+ }
+
+ va_list args;
+ char msg[256];
+ const char* sevStr;
+
+ switch (aSeverity) {
+ case NESTEGG_LOG_DEBUG:
+ sevStr = "DBG";
+ break;
+ case NESTEGG_LOG_INFO:
+ sevStr = "INF";
+ break;
+ case NESTEGG_LOG_WARNING:
+ sevStr = "WRN";
+ break;
+ case NESTEGG_LOG_ERROR:
+ sevStr = "ERR";
+ break;
+ case NESTEGG_LOG_CRITICAL:
+ sevStr = "CRT";
+ break;
+ default:
+ sevStr = "UNK";
+ break;
+ }
+
+ va_start(args, aFormat);
+
+ SprintfLiteral(msg, "%p [Nestegg-%s] ", aContext, sevStr);
+ PR_vsnprintf(msg + strlen(msg), sizeof(msg) - strlen(msg), aFormat, args);
+ MOZ_LOG(gNesteggLog, LogLevel::Debug, ("%s", msg));
+
+ va_end(args);
+}
+
+WebMDemuxer::NestEggContext::~NestEggContext() {
+ if (mContext) {
+ nestegg_destroy(mContext);
+ }
+}
+
+int WebMDemuxer::NestEggContext::Init() {
+ nestegg_io io;
+ io.read = webmdemux_read;
+ io.seek = webmdemux_seek;
+ io.tell = webmdemux_tell;
+ io.userdata = this;
+
+ // While reading the metadata, we do not really care about which nestegg
+ // context is being used so long that they are both initialised.
+ // For reading the metadata however, we will use mVideoContext.
+ return nestegg_init(&mContext, io, &webmdemux_log,
+ mParent->IsMediaSource() ? mResource.GetLength() : -1);
+}
+
+WebMDemuxer::WebMDemuxer(MediaResource* aResource)
+ : WebMDemuxer(aResource, false) {}
+
+WebMDemuxer::WebMDemuxer(MediaResource* aResource, bool aIsMediaSource)
+ : mVideoContext(this, aResource),
+ mAudioContext(this, aResource),
+ mBufferedState(nullptr),
+ mInitData(nullptr),
+ mVideoTrack(0),
+ mAudioTrack(0),
+ mSeekPreroll(0),
+ mAudioCodec(-1),
+ mVideoCodec(-1),
+ mHasVideo(false),
+ mHasAudio(false),
+ mNeedReIndex(true),
+ mLastWebMBlockOffset(-1),
+ mIsMediaSource(aIsMediaSource) {
+ DDLINKCHILD("resource", aResource);
+ // Audio/video contexts hold a MediaResourceIndex.
+ DDLINKCHILD("video context", mVideoContext.GetResource());
+ DDLINKCHILD("audio context", mAudioContext.GetResource());
+}
+
+WebMDemuxer::~WebMDemuxer() {
+ Reset(TrackInfo::kVideoTrack);
+ Reset(TrackInfo::kAudioTrack);
+}
+
+RefPtr<WebMDemuxer::InitPromise> WebMDemuxer::Init() {
+ InitBufferedState();
+
+ if (NS_FAILED(ReadMetadata())) {
+ return InitPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_METADATA_ERR,
+ __func__);
+ }
+
+ if (!GetNumberTracks(TrackInfo::kAudioTrack) &&
+ !GetNumberTracks(TrackInfo::kVideoTrack)) {
+ return InitPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_METADATA_ERR,
+ __func__);
+ }
+
+ return InitPromise::CreateAndResolve(NS_OK, __func__);
+}
+
+void WebMDemuxer::InitBufferedState() {
+ MOZ_ASSERT(!mBufferedState);
+ mBufferedState = new WebMBufferedState;
+}
+
+uint32_t WebMDemuxer::GetNumberTracks(TrackInfo::TrackType aType) const {
+ switch (aType) {
+ case TrackInfo::kAudioTrack:
+ return mHasAudio ? 1 : 0;
+ case TrackInfo::kVideoTrack:
+ return mHasVideo ? 1 : 0;
+ default:
+ return 0;
+ }
+}
+
+UniquePtr<TrackInfo> WebMDemuxer::GetTrackInfo(TrackInfo::TrackType aType,
+ size_t aTrackNumber) const {
+ switch (aType) {
+ case TrackInfo::kAudioTrack:
+ return mInfo.mAudio.Clone();
+ case TrackInfo::kVideoTrack:
+ return mInfo.mVideo.Clone();
+ default:
+ return nullptr;
+ }
+}
+
+already_AddRefed<MediaTrackDemuxer> WebMDemuxer::GetTrackDemuxer(
+ TrackInfo::TrackType aType, uint32_t aTrackNumber) {
+ if (GetNumberTracks(aType) <= aTrackNumber) {
+ return nullptr;
+ }
+ RefPtr<WebMTrackDemuxer> e = new WebMTrackDemuxer(this, aType, aTrackNumber);
+ DDLINKCHILD("track demuxer", e.get());
+ mDemuxers.AppendElement(e);
+
+ return e.forget();
+}
+
+void WebMDemuxer::Reset(TrackInfo::TrackType aType) {
+ mProcessedDiscardPadding = false;
+ if (aType == TrackInfo::kVideoTrack) {
+ mVideoPackets.Reset();
+ } else {
+ mAudioPackets.Reset();
+ }
+}
+
+nsresult WebMDemuxer::ReadMetadata() {
+ int r = mVideoContext.Init();
+ if (r == -1) {
+ WEBM_DEBUG("mVideoContext::Init failure");
+ return NS_ERROR_FAILURE;
+ }
+ if (mAudioContext.Init() == -1) {
+ WEBM_DEBUG("mAudioContext::Init failure");
+ return NS_ERROR_FAILURE;
+ }
+
+ // For reading the metadata we can only use the video resource/context.
+ MediaResourceIndex& resource = Resource(TrackInfo::kVideoTrack);
+ nestegg* context = Context(TrackInfo::kVideoTrack);
+
+ {
+ // Check how much data nestegg read and force feed it to BufferedState.
+ RefPtr<MediaByteBuffer> buffer = resource.MediaReadAt(0, resource.Tell());
+ if (!buffer) {
+ WEBM_DEBUG("resource.MediaReadAt error");
+ return NS_ERROR_FAILURE;
+ }
+ mBufferedState->NotifyDataArrived(buffer->Elements(), buffer->Length(), 0);
+ if (mBufferedState->GetInitEndOffset() < 0) {
+ WEBM_DEBUG("Couldn't find init end");
+ return NS_ERROR_FAILURE;
+ }
+ MOZ_ASSERT(mBufferedState->GetInitEndOffset() <= resource.Tell());
+ }
+ mInitData = resource.MediaReadAt(0, mBufferedState->GetInitEndOffset());
+ if (!mInitData ||
+ mInitData->Length() != size_t(mBufferedState->GetInitEndOffset())) {
+ WEBM_DEBUG("Couldn't read init data");
+ return NS_ERROR_FAILURE;
+ }
+
+ unsigned int ntracks = 0;
+ r = nestegg_track_count(context, &ntracks);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_track_count error");
+ return NS_ERROR_FAILURE;
+ }
+
+ for (unsigned int track = 0; track < ntracks; ++track) {
+ int id = nestegg_track_codec_id(context, track);
+ if (id == -1) {
+ WEBM_DEBUG("nestegg_track_codec_id error");
+ return NS_ERROR_FAILURE;
+ }
+ int type = nestegg_track_type(context, track);
+ if (type == NESTEGG_TRACK_VIDEO && !mHasVideo) {
+ nestegg_video_params params;
+ r = nestegg_track_video_params(context, track, &params);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_track_video_params error");
+ return NS_ERROR_FAILURE;
+ }
+ mVideoCodec = nestegg_track_codec_id(context, track);
+ switch (mVideoCodec) {
+ case NESTEGG_CODEC_VP8:
+ mInfo.mVideo.mMimeType = "video/vp8";
+ break;
+ case NESTEGG_CODEC_VP9:
+ mInfo.mVideo.mMimeType = "video/vp9";
+ break;
+ case NESTEGG_CODEC_AV1:
+ mInfo.mVideo.mMimeType = "video/av1";
+ break;
+ default:
+ NS_WARNING("Unknown WebM video codec");
+ return NS_ERROR_FAILURE;
+ }
+
+ mInfo.mVideo.mColorPrimaries = gfxUtils::CicpToColorPrimaries(
+ static_cast<gfx::CICP::ColourPrimaries>(params.primaries),
+ gMediaDemuxerLog);
+
+ // For VPX, this is our only chance to capture the transfer
+ // characteristics, which we can't get from a VPX bitstream later.
+ // We only need this value if the video is using the BT2020
+ // colorspace, which will be determined on a per-frame basis later.
+ mInfo.mVideo.mTransferFunction = gfxUtils::CicpToTransferFunction(
+ static_cast<gfx::CICP::TransferCharacteristics>(
+ params.transfer_characteristics));
+
+ // Picture region, taking into account cropping, before scaling
+ // to the display size.
+ unsigned int cropH = params.crop_right + params.crop_left;
+ unsigned int cropV = params.crop_bottom + params.crop_top;
+ gfx::IntRect pictureRect(params.crop_left, params.crop_top,
+ params.width - cropH, params.height - cropV);
+
+ // If the cropping data appears invalid then use the frame data
+ if (pictureRect.width <= 0 || pictureRect.height <= 0 ||
+ pictureRect.x < 0 || pictureRect.y < 0) {
+ pictureRect.x = 0;
+ pictureRect.y = 0;
+ pictureRect.width = params.width;
+ pictureRect.height = params.height;
+ }
+
+ // Validate the container-reported frame and pictureRect sizes. This
+ // ensures that our video frame creation code doesn't overflow.
+ gfx::IntSize displaySize(params.display_width, params.display_height);
+ gfx::IntSize frameSize(params.width, params.height);
+ if (!IsValidVideoRegion(frameSize, pictureRect, displaySize)) {
+ // Video track's frame sizes will overflow. Ignore the video track.
+ continue;
+ }
+
+ mVideoTrack = track;
+ mHasVideo = true;
+
+ mInfo.mVideo.mDisplay = displaySize;
+ mInfo.mVideo.mImage = frameSize;
+ mInfo.mVideo.SetImageRect(pictureRect);
+ mInfo.mVideo.SetAlpha(params.alpha_mode);
+
+ switch (params.stereo_mode) {
+ case NESTEGG_VIDEO_MONO:
+ mInfo.mVideo.mStereoMode = StereoMode::MONO;
+ break;
+ case NESTEGG_VIDEO_STEREO_LEFT_RIGHT:
+ mInfo.mVideo.mStereoMode = StereoMode::LEFT_RIGHT;
+ break;
+ case NESTEGG_VIDEO_STEREO_BOTTOM_TOP:
+ mInfo.mVideo.mStereoMode = StereoMode::BOTTOM_TOP;
+ break;
+ case NESTEGG_VIDEO_STEREO_TOP_BOTTOM:
+ mInfo.mVideo.mStereoMode = StereoMode::TOP_BOTTOM;
+ break;
+ case NESTEGG_VIDEO_STEREO_RIGHT_LEFT:
+ mInfo.mVideo.mStereoMode = StereoMode::RIGHT_LEFT;
+ break;
+ }
+ uint64_t duration = 0;
+ r = nestegg_duration(context, &duration);
+ if (!r) {
+ mInfo.mVideo.mDuration = TimeUnit::FromNanoseconds(duration);
+ }
+ WEBM_DEBUG("stream duration: %lf\n", mInfo.mVideo.mDuration.ToSeconds());
+ mInfo.mVideo.mCrypto = GetTrackCrypto(TrackInfo::kVideoTrack, track);
+ if (mInfo.mVideo.mCrypto.IsEncrypted()) {
+ MOZ_ASSERT(mInfo.mVideo.mCrypto.mCryptoScheme == CryptoScheme::Cenc,
+ "WebM should only use cenc scheme");
+ mCrypto.AddInitData(u"webm"_ns, mInfo.mVideo.mCrypto.mKeyId);
+ }
+ } else if (type == NESTEGG_TRACK_AUDIO && !mHasAudio) {
+ nestegg_audio_params params;
+ r = nestegg_track_audio_params(context, track, &params);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_track_audio_params error");
+ return NS_ERROR_FAILURE;
+ }
+ if (params.rate >
+ static_cast<decltype(params.rate)>(AudioInfo::MAX_RATE) ||
+ params.rate <= static_cast<decltype(params.rate)>(0) ||
+ params.channels > AudioConfig::ChannelLayout::MAX_CHANNELS) {
+ WEBM_DEBUG("Invalid audio param rate: %lf channel count: %d",
+ params.rate, params.channels);
+ return NS_ERROR_DOM_MEDIA_METADATA_ERR;
+ }
+
+ mAudioTrack = track;
+ mHasAudio = true;
+ mAudioCodec = nestegg_track_codec_id(context, track);
+ if (mAudioCodec == NESTEGG_CODEC_VORBIS) {
+ mInfo.mAudio.mCodecSpecificConfig =
+ AudioCodecSpecificVariant{VorbisCodecSpecificData{}};
+ mInfo.mAudio.mMimeType = "audio/vorbis";
+ } else if (mAudioCodec == NESTEGG_CODEC_OPUS) {
+ uint64_t codecDelayUs = params.codec_delay / 1000;
+ mInfo.mAudio.mMimeType = "audio/opus";
+ OpusCodecSpecificData opusCodecSpecificData;
+ opusCodecSpecificData.mContainerCodecDelayFrames =
+ AssertedCast<int64_t>(USECS_PER_S * codecDelayUs / 48000);
+ WEBM_DEBUG("Preroll for Opus: %" PRIu64 " frames",
+ opusCodecSpecificData.mContainerCodecDelayFrames);
+ mInfo.mAudio.mCodecSpecificConfig =
+ AudioCodecSpecificVariant{std::move(opusCodecSpecificData)};
+ }
+ mSeekPreroll = params.seek_preroll;
+ mInfo.mAudio.mRate = AssertedCast<uint32_t>(params.rate);
+ mInfo.mAudio.mChannels = params.channels;
+
+ unsigned int nheaders = 0;
+ r = nestegg_track_codec_data_count(context, track, &nheaders);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_track_codec_data_count error");
+ return NS_ERROR_FAILURE;
+ }
+
+ AutoTArray<const unsigned char*, 4> headers;
+ AutoTArray<size_t, 4> headerLens;
+ for (uint32_t header = 0; header < nheaders; ++header) {
+ unsigned char* data = 0;
+ size_t length = 0;
+ r = nestegg_track_codec_data(context, track, header, &data, &length);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_track_codec_data error");
+ return NS_ERROR_FAILURE;
+ }
+ headers.AppendElement(data);
+ headerLens.AppendElement(length);
+ }
+
+ // Vorbis has 3 headers, convert to Xiph extradata format to send them to
+ // the demuxer.
+ // TODO: This is already the format WebM stores them in. Would be nice
+ // to avoid having libnestegg split them only for us to pack them again,
+ // but libnestegg does not give us an API to access this data directly.
+ RefPtr<MediaByteBuffer> audioCodecSpecificBlob =
+ GetAudioCodecSpecificBlob(mInfo.mAudio.mCodecSpecificConfig);
+ if (nheaders > 1) {
+ if (!XiphHeadersToExtradata(audioCodecSpecificBlob, headers,
+ headerLens)) {
+ WEBM_DEBUG("Couldn't parse Xiph headers");
+ return NS_ERROR_FAILURE;
+ }
+ } else {
+ audioCodecSpecificBlob->AppendElements(headers[0], headerLens[0]);
+ }
+ uint64_t duration = 0;
+ r = nestegg_duration(context, &duration);
+ if (!r) {
+ mInfo.mAudio.mDuration = TimeUnit::FromNanoseconds(duration);
+ WEBM_DEBUG("audio track duration: %lf",
+ mInfo.mAudio.mDuration.ToSeconds());
+ }
+ mInfo.mAudio.mCrypto = GetTrackCrypto(TrackInfo::kAudioTrack, track);
+ if (mInfo.mAudio.mCrypto.IsEncrypted()) {
+ MOZ_ASSERT(mInfo.mAudio.mCrypto.mCryptoScheme == CryptoScheme::Cenc,
+ "WebM should only use cenc scheme");
+ mCrypto.AddInitData(u"webm"_ns, mInfo.mAudio.mCrypto.mKeyId);
+ }
+ }
+ }
+ WEBM_DEBUG("Read metadata OK");
+ return NS_OK;
+}
+
+bool WebMDemuxer::IsSeekable() const {
+ return Context(TrackInfo::kVideoTrack) &&
+ nestegg_has_cues(Context(TrackInfo::kVideoTrack));
+}
+
+bool WebMDemuxer::IsSeekableOnlyInBufferedRanges() const {
+ return Context(TrackInfo::kVideoTrack) &&
+ !nestegg_has_cues(Context(TrackInfo::kVideoTrack));
+}
+
+void WebMDemuxer::EnsureUpToDateIndex() {
+ if (!mNeedReIndex || !mInitData) {
+ return;
+ }
+ AutoPinned<MediaResource> resource(
+ Resource(TrackInfo::kVideoTrack).GetResource());
+ MediaByteRangeSet byteRanges;
+ nsresult rv = resource->GetCachedRanges(byteRanges);
+ if (NS_FAILED(rv) || byteRanges.IsEmpty()) {
+ return;
+ }
+ mBufferedState->UpdateIndex(byteRanges, resource);
+
+ mNeedReIndex = false;
+
+ if (!mIsMediaSource) {
+ return;
+ }
+ mLastWebMBlockOffset = mBufferedState->GetLastBlockOffset();
+ MOZ_ASSERT(mLastWebMBlockOffset <= resource->GetLength());
+}
+
+void WebMDemuxer::NotifyDataArrived() {
+ WEBM_DEBUG("");
+ mNeedReIndex = true;
+}
+
+void WebMDemuxer::NotifyDataRemoved() {
+ mBufferedState->Reset();
+ if (mInitData) {
+ mBufferedState->NotifyDataArrived(mInitData->Elements(),
+ mInitData->Length(), 0);
+ }
+ mNeedReIndex = true;
+}
+
+UniquePtr<EncryptionInfo> WebMDemuxer::GetCrypto() {
+ return mCrypto.IsEncrypted() ? MakeUnique<EncryptionInfo>(mCrypto) : nullptr;
+}
+
+CryptoTrack WebMDemuxer::GetTrackCrypto(TrackInfo::TrackType aType,
+ size_t aTrackNumber) {
+ const int WEBM_IV_SIZE = 16;
+ const unsigned char* contentEncKeyId;
+ size_t contentEncKeyIdLength;
+ CryptoTrack crypto;
+ nestegg* context = Context(aType);
+
+ int r = nestegg_track_content_enc_key_id(
+ context, aTrackNumber, &contentEncKeyId, &contentEncKeyIdLength);
+
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_track_content_enc_key_id failed r=%d", r);
+ return crypto;
+ }
+
+ uint32_t i;
+ nsTArray<uint8_t> initData;
+ for (i = 0; i < contentEncKeyIdLength; i++) {
+ initData.AppendElement(contentEncKeyId[i]);
+ }
+
+ if (!initData.IsEmpty()) {
+ // Webm only uses a cenc style scheme.
+ crypto.mCryptoScheme = CryptoScheme::Cenc;
+ crypto.mIVSize = WEBM_IV_SIZE;
+ crypto.mKeyId = std::move(initData);
+ }
+
+ return crypto;
+}
+
+nsresult WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType,
+ MediaRawDataQueue* aSamples) {
+ if (mIsMediaSource) {
+ // To ensure mLastWebMBlockOffset is properly up to date.
+ EnsureUpToDateIndex();
+ }
+
+ RefPtr<NesteggPacketHolder> holder;
+ nsresult rv = NextPacket(aType, holder);
+
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+
+ int r = 0;
+ unsigned int count = 0;
+ r = nestegg_packet_count(holder->Packet(), &count);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_packet_count: error");
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+ int64_t tstamp = holder->Timestamp();
+ int64_t duration = holder->Duration();
+
+ // The end time of this frame is the start time of the next frame. Fetch
+ // the timestamp of the next packet for this track. If we've reached the
+ // end of the resource, use the file's duration as the end time of this
+ // video frame.
+ RefPtr<NesteggPacketHolder> next_holder;
+ rv = NextPacket(aType, next_holder);
+ if (NS_FAILED(rv) && rv != NS_ERROR_DOM_MEDIA_END_OF_STREAM) {
+ WEBM_DEBUG("NextPacket: error");
+ return rv;
+ }
+
+ int64_t next_tstamp = INT64_MIN;
+ auto calculateNextTimestamp = [&](auto&& pushPacket, auto&& lastFrameTime,
+ int64_t trackEndTime) {
+ if (next_holder) {
+ next_tstamp = next_holder->Timestamp();
+ (this->*pushPacket)(next_holder);
+ } else if (duration >= 0) {
+ next_tstamp = tstamp + duration;
+ } else if (lastFrameTime.isSome()) {
+ next_tstamp = tstamp + (tstamp - lastFrameTime.ref());
+ } else if (mIsMediaSource) {
+ (this->*pushPacket)(holder);
+ } else {
+ // If we can't get frame's duration, it means either we need to wait for
+ // more data for MSE case or this is the last frame for file resource
+ // case.
+ if (tstamp > trackEndTime) {
+ // This shouldn't happen, but some muxers give incorrect durations to
+ // segments, then have samples appear beyond those durations.
+ WEBM_DEBUG("Found tstamp=%" PRIi64 " > trackEndTime=%" PRIi64
+ " while calculating next timestamp! Indicates a bad mux! "
+ "Will use tstamp value.",
+ tstamp, trackEndTime);
+ }
+ next_tstamp = std::max<int64_t>(tstamp, trackEndTime);
+ }
+ lastFrameTime = Some(tstamp);
+ };
+
+ if (aType == TrackInfo::kAudioTrack) {
+ calculateNextTimestamp(&WebMDemuxer::PushAudioPacket, mLastAudioFrameTime,
+ mInfo.mAudio.mDuration.ToMicroseconds());
+ } else {
+ calculateNextTimestamp(&WebMDemuxer::PushVideoPacket, mLastVideoFrameTime,
+ mInfo.mVideo.mDuration.ToMicroseconds());
+ }
+
+ if (mIsMediaSource && next_tstamp == INT64_MIN) {
+ WEBM_DEBUG("WebM is a media source, and next timestamp computation filed.");
+ return NS_ERROR_DOM_MEDIA_END_OF_STREAM;
+ }
+
+ int64_t discardPadding = 0;
+ if (aType == TrackInfo::kAudioTrack) {
+ (void)nestegg_packet_discard_padding(holder->Packet(), &discardPadding);
+ }
+
+ int packetEncryption = nestegg_packet_encryption(holder->Packet());
+
+ for (uint32_t i = 0; i < count; ++i) {
+ unsigned char* data = nullptr;
+ size_t length;
+ r = nestegg_packet_data(holder->Packet(), i, &data, &length);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_packet_data failed r=%d", r);
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+ unsigned char* alphaData = nullptr;
+ size_t alphaLength = 0;
+ // Check packets for alpha information if file has declared alpha frames
+ // may be present.
+ if (mInfo.mVideo.HasAlpha()) {
+ r = nestegg_packet_additional_data(holder->Packet(), 1, &alphaData,
+ &alphaLength);
+ if (r == -1) {
+ WEBM_DEBUG(
+ "nestegg_packet_additional_data failed to retrieve alpha data r=%d",
+ r);
+ }
+ }
+ bool isKeyframe = false;
+ if (aType == TrackInfo::kAudioTrack) {
+ isKeyframe = true;
+ } else if (aType == TrackInfo::kVideoTrack) {
+ if (packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_ENCRYPTED ||
+ packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_PARTITIONED) {
+ // Packet is encrypted, can't peek, use packet info
+ isKeyframe = nestegg_packet_has_keyframe(holder->Packet()) ==
+ NESTEGG_PACKET_HAS_KEYFRAME_TRUE;
+ } else {
+ MOZ_ASSERT(
+ packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_UNENCRYPTED ||
+ packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_FALSE,
+ "Unencrypted packet expected");
+ auto sample = Span(data, length);
+ auto alphaSample = Span(alphaData, alphaLength);
+
+ switch (mVideoCodec) {
+ case NESTEGG_CODEC_VP8:
+ isKeyframe = VPXDecoder::IsKeyframe(sample, VPXDecoder::Codec::VP8);
+ if (isKeyframe && alphaLength) {
+ isKeyframe =
+ VPXDecoder::IsKeyframe(alphaSample, VPXDecoder::Codec::VP8);
+ }
+ break;
+ case NESTEGG_CODEC_VP9:
+ isKeyframe = VPXDecoder::IsKeyframe(sample, VPXDecoder::Codec::VP9);
+ if (isKeyframe && alphaLength) {
+ isKeyframe =
+ VPXDecoder::IsKeyframe(alphaSample, VPXDecoder::Codec::VP9);
+ }
+ break;
+#ifdef MOZ_AV1
+ case NESTEGG_CODEC_AV1:
+ isKeyframe = AOMDecoder::IsKeyframe(sample);
+ if (isKeyframe && alphaLength) {
+ isKeyframe = AOMDecoder::IsKeyframe(alphaSample);
+ }
+ break;
+#endif
+ default:
+ NS_WARNING("Cannot detect keyframes in unknown WebM video codec");
+ return NS_ERROR_FAILURE;
+ }
+ }
+ }
+
+ WEBM_DEBUG("push sample tstamp: %" PRId64 " next_tstamp: %" PRId64
+ " length: %zu kf: %d",
+ tstamp, next_tstamp, length, isKeyframe);
+ RefPtr<MediaRawData> sample;
+ if (mInfo.mVideo.HasAlpha() && alphaLength != 0) {
+ sample = new MediaRawData(data, length, alphaData, alphaLength);
+ if ((length && !sample->Data()) ||
+ (alphaLength && !sample->AlphaData())) {
+ WEBM_DEBUG("Couldn't allocate MediaRawData: OOM");
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ } else {
+ sample = new MediaRawData(data, length);
+ if (length && !sample->Data()) {
+ WEBM_DEBUG("Couldn't allocate MediaRawData: OOM");
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ }
+ sample->mTimecode = TimeUnit::FromMicroseconds(tstamp);
+ sample->mTime = TimeUnit::FromMicroseconds(tstamp);
+ if (next_tstamp > tstamp) {
+ sample->mDuration = TimeUnit::FromMicroseconds(next_tstamp - tstamp);
+ }
+ sample->mOffset = holder->Offset();
+ sample->mKeyframe = isKeyframe;
+ if (discardPadding && i == count - 1) {
+ sample->mOriginalPresentationWindow =
+ Some(media::TimeInterval{sample->mTime, sample->GetEndTime()});
+ if (discardPadding < 0) {
+ // This will ensure decoding will error out, and the file is rejected.
+ sample->mDuration = TimeUnit::Invalid();
+ } else {
+ TimeUnit padding = TimeUnit::FromNanoseconds(discardPadding);
+ if (padding > sample->mDuration || mProcessedDiscardPadding) {
+ WEBM_DEBUG(
+ "Padding frames larger than packet size, flagging the packet for "
+ "error (padding: %s, duration: %s, already processed: %s)",
+ padding.ToString().get(), sample->mDuration.ToString().get(),
+ mProcessedDiscardPadding ? "true" : "false");
+ sample->mDuration = TimeUnit::Invalid();
+ } else {
+ sample->mDuration -= padding;
+ }
+ }
+ mProcessedDiscardPadding = true;
+ }
+
+ if (packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_ENCRYPTED ||
+ packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_PARTITIONED) {
+ UniquePtr<MediaRawDataWriter> writer(sample->CreateWriter());
+ unsigned char const* iv;
+ size_t ivLength;
+ nestegg_packet_iv(holder->Packet(), &iv, &ivLength);
+ writer->mCrypto.mCryptoScheme = CryptoScheme::Cenc;
+ writer->mCrypto.mIVSize = ivLength;
+ if (ivLength == 0) {
+ // Frame is not encrypted. This shouldn't happen as it means the
+ // encryption bit is set on a frame with no IV, but we gracefully
+ // handle incase.
+ MOZ_ASSERT_UNREACHABLE(
+ "Unencrypted packets should not have the encryption bit set!");
+ WEBM_DEBUG("Unencrypted packet with encryption bit set");
+ writer->mCrypto.mPlainSizes.AppendElement(length);
+ writer->mCrypto.mEncryptedSizes.AppendElement(0);
+ } else {
+ // Frame is encrypted
+ writer->mCrypto.mIV.AppendElements(iv, 8);
+ // Iv from a sample is 64 bits, must be padded with 64 bits more 0s
+ // in compliance with spec
+ for (uint32_t i = 0; i < 8; i++) {
+ writer->mCrypto.mIV.AppendElement(0);
+ }
+
+ if (packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_ENCRYPTED) {
+ writer->mCrypto.mPlainSizes.AppendElement(0);
+ writer->mCrypto.mEncryptedSizes.AppendElement(length);
+ } else if (packetEncryption ==
+ NESTEGG_PACKET_HAS_SIGNAL_BYTE_PARTITIONED) {
+ uint8_t numPartitions = 0;
+ const uint32_t* partitions = NULL;
+ nestegg_packet_offsets(holder->Packet(), &partitions, &numPartitions);
+
+ // WebM stores a list of 'partitions' in the data, which alternate
+ // clear, encrypted. The data in the first partition is always clear.
+ // So, and sample might look as follows:
+ // 00|XXXX|000|XX, where | represents a partition, 0 a clear byte and
+ // X an encrypted byte. If the first bytes in sample are unencrypted,
+ // the first partition will be at zero |XXXX|000|XX.
+ //
+ // As GMP expects the lengths of the clear and encrypted chunks of
+ // data, we calculate these from the difference between the last two
+ // partitions.
+ uint32_t lastOffset = 0;
+ bool encrypted = false;
+
+ for (uint8_t i = 0; i < numPartitions; i++) {
+ uint32_t partition = partitions[i];
+ uint32_t currentLength = partition - lastOffset;
+
+ if (encrypted) {
+ writer->mCrypto.mEncryptedSizes.AppendElement(currentLength);
+ } else {
+ writer->mCrypto.mPlainSizes.AppendElement(currentLength);
+ }
+
+ encrypted = !encrypted;
+ lastOffset = partition;
+
+ MOZ_ASSERT(lastOffset <= length);
+ }
+
+ // Add the data between the last offset and the end of the data.
+ // 000|XXX|000
+ // ^---^
+ if (encrypted) {
+ writer->mCrypto.mEncryptedSizes.AppendElement(length - lastOffset);
+ } else {
+ writer->mCrypto.mPlainSizes.AppendElement(length - lastOffset);
+ }
+
+ // Make sure we have an equal number of encrypted and plain sizes (GMP
+ // expects this). This simple check is sufficient as there are two
+ // possible cases at this point:
+ // 1. The number of samples are even (so we don't need to do anything)
+ // 2. There is one more clear sample than encrypted samples, so add a
+ // zero length encrypted chunk.
+ // There can never be more encrypted partitions than clear partitions
+ // due to the alternating structure of the WebM samples and the
+ // restriction that the first chunk is always clear.
+ if (numPartitions % 2 == 0) {
+ writer->mCrypto.mEncryptedSizes.AppendElement(0);
+ }
+
+ // Assert that the lengths of the encrypted and plain samples add to
+ // the length of the data.
+ MOZ_ASSERT(
+ ((size_t)(std::accumulate(writer->mCrypto.mPlainSizes.begin(),
+ writer->mCrypto.mPlainSizes.end(), 0) +
+ std::accumulate(writer->mCrypto.mEncryptedSizes.begin(),
+ writer->mCrypto.mEncryptedSizes.end(),
+ 0)) == length));
+ }
+ }
+ }
+ aSamples->Push(sample);
+ }
+ return NS_OK;
+}
+
+nsresult WebMDemuxer::NextPacket(TrackInfo::TrackType aType,
+ RefPtr<NesteggPacketHolder>& aPacket) {
+ bool isVideo = aType == TrackInfo::kVideoTrack;
+
+ // Flag to indicate that we do need to playback these types of
+ // packets.
+ bool hasType = isVideo ? mHasVideo : mHasAudio;
+
+ if (!hasType) {
+ WEBM_DEBUG("No media type found");
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+
+ // The packet queue for the type that we are interested in.
+ WebMPacketQueue& packets = isVideo ? mVideoPackets : mAudioPackets;
+
+ if (packets.GetSize() > 0) {
+ aPacket = packets.PopFront();
+ return NS_OK;
+ }
+
+ // Track we are interested in
+ uint32_t ourTrack = isVideo ? mVideoTrack : mAudioTrack;
+
+ do {
+ RefPtr<NesteggPacketHolder> holder;
+ nsresult rv = DemuxPacket(aType, holder);
+ if (NS_FAILED(rv)) {
+ return rv;
+ }
+ if (!holder) {
+ WEBM_DEBUG("Couldn't demux packet");
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+
+ if (ourTrack == holder->Track()) {
+ aPacket = holder;
+ return NS_OK;
+ }
+ } while (true);
+}
+
+nsresult WebMDemuxer::DemuxPacket(TrackInfo::TrackType aType,
+ RefPtr<NesteggPacketHolder>& aPacket) {
+ nestegg_packet* packet;
+ int r = nestegg_read_packet(Context(aType), &packet);
+ if (r == 0) {
+ nestegg_read_reset(Context(aType));
+ WEBM_DEBUG("EOS");
+ return NS_ERROR_DOM_MEDIA_END_OF_STREAM;
+ } else if (r < 0) {
+ WEBM_DEBUG("nestegg_read_packet: error");
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+
+ unsigned int track = 0;
+ r = nestegg_packet_track(packet, &track);
+ if (r == -1) {
+ WEBM_DEBUG("nestegg_packet_track: error");
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+
+ int64_t offset = Resource(aType).Tell();
+ RefPtr<NesteggPacketHolder> holder = new NesteggPacketHolder();
+ if (!holder->Init(packet, offset, track, false)) {
+ WEBM_DEBUG("NesteggPacketHolder::Init: error");
+ return NS_ERROR_DOM_MEDIA_DEMUXER_ERR;
+ }
+
+ aPacket = holder;
+ return NS_OK;
+}
+
+void WebMDemuxer::PushAudioPacket(NesteggPacketHolder* aItem) {
+ mAudioPackets.PushFront(aItem);
+}
+
+void WebMDemuxer::PushVideoPacket(NesteggPacketHolder* aItem) {
+ mVideoPackets.PushFront(aItem);
+}
+
+nsresult WebMDemuxer::SeekInternal(TrackInfo::TrackType aType,
+ const TimeUnit& aTarget) {
+ EnsureUpToDateIndex();
+ uint32_t trackToSeek = mHasVideo ? mVideoTrack : mAudioTrack;
+ MOZ_ASSERT(aTarget.ToNanoseconds() >= 0, "Seek time can't be negative");
+ uint64_t target = static_cast<uint64_t>(aTarget.ToNanoseconds());
+ WEBM_DEBUG("Seeking to %lf", aTarget.ToSeconds());
+
+ Reset(aType);
+
+ if (mSeekPreroll) {
+ uint64_t startTime = 0;
+ if (!mBufferedState->GetStartTime(&startTime)) {
+ startTime = 0;
+ }
+ WEBM_DEBUG("Seek Target: %f",
+ TimeUnit::FromNanoseconds(target).ToSeconds());
+ if (target < mSeekPreroll || target - mSeekPreroll < startTime) {
+ target = startTime;
+ } else {
+ target -= mSeekPreroll;
+ }
+ WEBM_DEBUG("SeekPreroll: %f StartTime: %f Adjusted Target: %f",
+ TimeUnit::FromNanoseconds(mSeekPreroll).ToSeconds(),
+ TimeUnit::FromNanoseconds(startTime).ToSeconds(),
+ TimeUnit::FromNanoseconds(target).ToSeconds());
+ }
+ int r = nestegg_track_seek(Context(aType), trackToSeek, target);
+ if (r == -1) {
+ WEBM_DEBUG("track_seek for track %u to %f failed, r=%d", trackToSeek,
+ TimeUnit::FromNanoseconds(target).ToSeconds(), r);
+ // Try seeking directly based on cluster information in memory.
+ int64_t offset = 0;
+ bool rv = mBufferedState->GetOffsetForTime(target, &offset);
+ if (!rv) {
+ WEBM_DEBUG("mBufferedState->GetOffsetForTime failed too");
+ return NS_ERROR_FAILURE;
+ }
+
+ if (offset < 0) {
+ WEBM_DEBUG("Unknow byte offset time for seek target %" PRIu64 "ns",
+ target);
+ return NS_ERROR_FAILURE;
+ }
+
+ r = nestegg_offset_seek(Context(aType), static_cast<uint64_t>(offset));
+ if (r == -1) {
+ WEBM_DEBUG("and nestegg_offset_seek to %" PRIu64 " failed", offset);
+ return NS_ERROR_FAILURE;
+ }
+ WEBM_DEBUG("got offset from buffered state: %" PRIu64 "", offset);
+ }
+
+ if (aType == TrackInfo::kAudioTrack) {
+ mLastAudioFrameTime.reset();
+ } else {
+ mLastVideoFrameTime.reset();
+ }
+
+ return NS_OK;
+}
+
+bool WebMDemuxer::IsBufferedIntervalValid(uint64_t start, uint64_t end) {
+ if (start > end) {
+ // Buffered ranges are clamped to the media's start time and duration. Any
+ // frames with timestamps outside that range are ignored, see bug 1697641
+ // for more info.
+ WEBM_DEBUG("Ignoring range %" PRIu64 "-%" PRIu64
+ ", due to invalid interval (start > end).",
+ start, end);
+ return false;
+ }
+
+ auto startTime = TimeUnit::FromNanoseconds(start);
+ auto endTime = TimeUnit::FromNanoseconds(end);
+
+ if (startTime.IsNegative() || endTime.IsNegative()) {
+ // We can get timestamps that are conceptually valid, but become
+ // negative due to uint64 -> int64 conversion from TimeUnit. We should
+ // not get negative timestamps, so guard against them.
+ WEBM_DEBUG(
+ "Invalid range %f-%f, likely result of uint64 -> int64 conversion.",
+ startTime.ToSeconds(), endTime.ToSeconds());
+ return false;
+ }
+
+ return true;
+}
+
+media::TimeIntervals WebMDemuxer::GetBuffered() {
+ EnsureUpToDateIndex();
+ AutoPinned<MediaResource> resource(
+ Resource(TrackInfo::kVideoTrack).GetResource());
+
+ media::TimeIntervals buffered;
+
+ MediaByteRangeSet ranges;
+ nsresult rv = resource->GetCachedRanges(ranges);
+ if (NS_FAILED(rv)) {
+ return media::TimeIntervals();
+ }
+ uint64_t duration = 0;
+ uint64_t startOffset = 0;
+ if (!nestegg_duration(Context(TrackInfo::kVideoTrack), &duration)) {
+ if (mBufferedState->GetStartTime(&startOffset)) {
+ duration += startOffset;
+ }
+ WEBM_DEBUG("Duration: %f StartTime: %f",
+ TimeUnit::FromNanoseconds(duration).ToSeconds(),
+ TimeUnit::FromNanoseconds(startOffset).ToSeconds());
+ }
+ for (uint32_t index = 0; index < ranges.Length(); index++) {
+ uint64_t start, end;
+ bool rv = mBufferedState->CalculateBufferedForRange(
+ ranges[index].mStart, ranges[index].mEnd, &start, &end);
+ if (rv) {
+ NS_ASSERTION(startOffset <= start,
+ "startOffset negative or larger than start time");
+
+ if (duration && end > duration) {
+ WEBM_DEBUG("limit range to duration, end: %f duration: %f",
+ TimeUnit::FromNanoseconds(end).ToSeconds(),
+ TimeUnit::FromNanoseconds(duration).ToSeconds());
+ end = duration;
+ }
+
+ if (!IsBufferedIntervalValid(start, end)) {
+ WEBM_DEBUG("Invalid interval, bailing");
+ break;
+ }
+
+ auto startTime = TimeUnit::FromNanoseconds(start);
+ auto endTime = TimeUnit::FromNanoseconds(end);
+
+ WEBM_DEBUG("add range %f-%f", startTime.ToSeconds(), endTime.ToSeconds());
+ buffered += media::TimeInterval(startTime, endTime);
+ }
+ }
+ return buffered;
+}
+
+bool WebMDemuxer::GetOffsetForTime(uint64_t aTime, int64_t* aOffset) {
+ EnsureUpToDateIndex();
+ return mBufferedState && mBufferedState->GetOffsetForTime(aTime, aOffset);
+}
+
+// WebMTrackDemuxer
+WebMTrackDemuxer::WebMTrackDemuxer(WebMDemuxer* aParent,
+ TrackInfo::TrackType aType,
+ uint32_t aTrackNumber)
+ : mParent(aParent), mType(aType), mNeedKeyframe(true) {
+ mInfo = mParent->GetTrackInfo(aType, aTrackNumber);
+ MOZ_ASSERT(mInfo);
+}
+
+WebMTrackDemuxer::~WebMTrackDemuxer() { mSamples.Reset(); }
+
+UniquePtr<TrackInfo> WebMTrackDemuxer::GetInfo() const {
+ return mInfo->Clone();
+}
+
+RefPtr<WebMTrackDemuxer::SeekPromise> WebMTrackDemuxer::Seek(
+ const TimeUnit& aTime) {
+ // Seeks to aTime. Upon success, SeekPromise will be resolved with the
+ // actual time seeked to. Typically the random access point time
+
+ auto seekTime = aTime;
+ bool keyframe = false;
+
+ mNeedKeyframe = true;
+
+ do {
+ mSamples.Reset();
+ mParent->SeekInternal(mType, seekTime);
+ nsresult rv = mParent->GetNextPacket(mType, &mSamples);
+ if (NS_FAILED(rv)) {
+ if (rv == NS_ERROR_DOM_MEDIA_END_OF_STREAM) {
+ // Ignore the error for now, the next GetSample will be rejected with
+ // EOS.
+ return SeekPromise::CreateAndResolve(TimeUnit::Zero(), __func__);
+ }
+ return SeekPromise::CreateAndReject(rv, __func__);
+ }
+
+ // Check what time we actually seeked to.
+ if (mSamples.GetSize() == 0) {
+ // We can't determine if the seek succeeded at this stage, so break the
+ // loop.
+ break;
+ }
+
+ for (const auto& sample : mSamples) {
+ seekTime = sample->mTime;
+ keyframe = sample->mKeyframe;
+ if (keyframe) {
+ break;
+ }
+ }
+ if (mType == TrackInfo::kVideoTrack &&
+ !mInfo->GetAsVideoInfo()->HasAlpha()) {
+ // We only perform a search for a keyframe on videos with alpha layer to
+ // prevent potential regression for normal video (even though invalid)
+ break;
+ }
+ if (!keyframe) {
+ // We didn't find any keyframe, attempt to seek to the previous cluster.
+ seekTime = mSamples.First()->mTime - TimeUnit::FromMicroseconds(1);
+ }
+ } while (!keyframe && seekTime >= TimeUnit::Zero());
+
+ SetNextKeyFrameTime();
+
+ return SeekPromise::CreateAndResolve(seekTime, __func__);
+}
+
+nsresult WebMTrackDemuxer::NextSample(RefPtr<MediaRawData>& aData) {
+ nsresult rv = NS_ERROR_DOM_MEDIA_END_OF_STREAM;
+ while (mSamples.GetSize() < 1 &&
+ NS_SUCCEEDED((rv = mParent->GetNextPacket(mType, &mSamples)))) {
+ }
+ if (mSamples.GetSize()) {
+ aData = mSamples.PopFront();
+ return NS_OK;
+ }
+ WEBM_DEBUG("WebMTrackDemuxer::NextSample: error");
+ return rv;
+}
+
+RefPtr<WebMTrackDemuxer::SamplesPromise> WebMTrackDemuxer::GetSamples(
+ int32_t aNumSamples) {
+ RefPtr<SamplesHolder> samples = new SamplesHolder;
+ MOZ_ASSERT(aNumSamples);
+
+ nsresult rv = NS_ERROR_DOM_MEDIA_END_OF_STREAM;
+
+ while (aNumSamples) {
+ RefPtr<MediaRawData> sample;
+ rv = NextSample(sample);
+ if (NS_FAILED(rv)) {
+ break;
+ }
+ // Ignore empty samples.
+ if (sample->Size() == 0) {
+ WEBM_DEBUG(
+ "0 sized sample encountered while getting samples, skipping it");
+ continue;
+ }
+ if (mNeedKeyframe && !sample->mKeyframe) {
+ continue;
+ }
+ if (!sample->HasValidTime()) {
+ return SamplesPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,
+ __func__);
+ }
+ mNeedKeyframe = false;
+ samples->AppendSample(sample);
+ aNumSamples--;
+ }
+
+ if (samples->GetSamples().IsEmpty()) {
+ return SamplesPromise::CreateAndReject(rv, __func__);
+ } else {
+ UpdateSamples(samples->GetSamples());
+ return SamplesPromise::CreateAndResolve(samples, __func__);
+ }
+}
+
+void WebMTrackDemuxer::SetNextKeyFrameTime() {
+ if (mType != TrackInfo::kVideoTrack || mParent->IsMediaSource()) {
+ return;
+ }
+
+ auto frameTime = TimeUnit::Invalid();
+
+ mNextKeyframeTime.reset();
+
+ MediaRawDataQueue skipSamplesQueue;
+ bool foundKeyframe = false;
+ while (!foundKeyframe && mSamples.GetSize()) {
+ RefPtr<MediaRawData> sample = mSamples.PopFront();
+ if (sample->mKeyframe) {
+ frameTime = sample->mTime;
+ foundKeyframe = true;
+ }
+ skipSamplesQueue.Push(sample.forget());
+ }
+ Maybe<int64_t> startTime;
+ if (skipSamplesQueue.GetSize()) {
+ const RefPtr<MediaRawData>& sample = skipSamplesQueue.First();
+ startTime.emplace(sample->mTimecode.ToMicroseconds());
+ }
+ // Demux and buffer frames until we find a keyframe.
+ RefPtr<MediaRawData> sample;
+ nsresult rv = NS_OK;
+ while (!foundKeyframe && NS_SUCCEEDED((rv = NextSample(sample)))) {
+ if (sample->mKeyframe) {
+ frameTime = sample->mTime;
+ foundKeyframe = true;
+ }
+ int64_t sampleTimecode = sample->mTimecode.ToMicroseconds();
+ skipSamplesQueue.Push(sample.forget());
+ if (!startTime) {
+ startTime.emplace(sampleTimecode);
+ } else if (!foundKeyframe &&
+ sampleTimecode > startTime.ref() + MAX_LOOK_AHEAD) {
+ WEBM_DEBUG("Couldn't find keyframe in a reasonable time, aborting");
+ break;
+ }
+ }
+ // We may have demuxed more than intended, so ensure that all frames are kept
+ // in the right order.
+ mSamples.PushFront(std::move(skipSamplesQueue));
+
+ if (frameTime.IsValid()) {
+ mNextKeyframeTime.emplace(frameTime);
+ WEBM_DEBUG(
+ "Next Keyframe %f (%u queued %.02fs)",
+ mNextKeyframeTime.value().ToSeconds(), uint32_t(mSamples.GetSize()),
+ (mSamples.Last()->mTimecode - mSamples.First()->mTimecode).ToSeconds());
+ } else {
+ WEBM_DEBUG("Couldn't determine next keyframe time (%u queued)",
+ uint32_t(mSamples.GetSize()));
+ }
+}
+
+void WebMTrackDemuxer::Reset() {
+ mSamples.Reset();
+ media::TimeIntervals buffered = GetBuffered();
+ mNeedKeyframe = true;
+ if (!buffered.IsEmpty()) {
+ WEBM_DEBUG("Seek to start point: %f", buffered.Start(0).ToSeconds());
+ mParent->SeekInternal(mType, buffered.Start(0));
+ SetNextKeyFrameTime();
+ } else {
+ mNextKeyframeTime.reset();
+ }
+}
+
+void WebMTrackDemuxer::UpdateSamples(
+ const nsTArray<RefPtr<MediaRawData>>& aSamples) {
+ for (const auto& sample : aSamples) {
+ if (sample->mCrypto.IsEncrypted()) {
+ UniquePtr<MediaRawDataWriter> writer(sample->CreateWriter());
+ writer->mCrypto.mIVSize = mInfo->mCrypto.mIVSize;
+ writer->mCrypto.mKeyId.AppendElements(mInfo->mCrypto.mKeyId);
+ }
+ }
+ if (mNextKeyframeTime.isNothing() ||
+ aSamples.LastElement()->mTime >= mNextKeyframeTime.value()) {
+ SetNextKeyFrameTime();
+ }
+}
+
+nsresult WebMTrackDemuxer::GetNextRandomAccessPoint(TimeUnit* aTime) {
+ if (mNextKeyframeTime.isNothing()) {
+ // There's no next key frame.
+ *aTime = TimeUnit::FromInfinity();
+ } else {
+ *aTime = mNextKeyframeTime.ref();
+ }
+ return NS_OK;
+}
+
+RefPtr<WebMTrackDemuxer::SkipAccessPointPromise>
+WebMTrackDemuxer::SkipToNextRandomAccessPoint(const TimeUnit& aTimeThreshold) {
+ uint32_t parsed = 0;
+ bool found = false;
+ RefPtr<MediaRawData> sample;
+ nsresult rv = NS_OK;
+
+ WEBM_DEBUG("TimeThreshold: %f", aTimeThreshold.ToSeconds());
+ while (!found && NS_SUCCEEDED((rv = NextSample(sample)))) {
+ parsed++;
+ if (sample->mKeyframe && sample->mTime >= aTimeThreshold) {
+ WEBM_DEBUG("next sample: %f (parsed: %d)", sample->mTime.ToSeconds(),
+ parsed);
+ found = true;
+ mSamples.Reset();
+ mSamples.PushFront(sample.forget());
+ }
+ }
+ if (NS_SUCCEEDED(rv)) {
+ SetNextKeyFrameTime();
+ }
+ if (found) {
+ return SkipAccessPointPromise::CreateAndResolve(parsed, __func__);
+ } else {
+ SkipFailureHolder failure(NS_ERROR_DOM_MEDIA_END_OF_STREAM, parsed);
+ return SkipAccessPointPromise::CreateAndReject(std::move(failure),
+ __func__);
+ }
+}
+
+media::TimeIntervals WebMTrackDemuxer::GetBuffered() {
+ return mParent->GetBuffered();
+}
+
+void WebMTrackDemuxer::BreakCycles() { mParent = nullptr; }
+
+int64_t WebMTrackDemuxer::GetEvictionOffset(const TimeUnit& aTime) {
+ int64_t offset;
+ int64_t nanos = aTime.ToNanoseconds();
+ if (nanos < 0 ||
+ !mParent->GetOffsetForTime(static_cast<uint64_t>(nanos), &offset)) {
+ return 0;
+ }
+
+ return offset;
+}
+} // namespace mozilla
+
+#undef WEBM_DEBUG