diff options
Diffstat (limited to 'dom/media/webm/WebMDemuxer.cpp')
| -rw-r--r-- | dom/media/webm/WebMDemuxer.cpp | 1155 |
1 files changed, 1155 insertions, 0 deletions
diff --git a/dom/media/webm/WebMDemuxer.cpp b/dom/media/webm/WebMDemuxer.cpp new file mode 100644 index 000000000..20ed71581 --- /dev/null +++ b/dom/media/webm/WebMDemuxer.cpp @@ -0,0 +1,1155 @@ +/* -*- 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 "MediaDecoderStateMachine.h" +#include "AbstractMediaDecoder.h" +#include "MediaResource.h" +#include "OpusDecoder.h" +#include "WebMDemuxer.h" +#include "WebMBufferedParser.h" +#include "gfx2DGlue.h" +#include "mozilla/Atomics.h" +#include "mozilla/EndianUtils.h" +#include "mozilla/SharedThreadPool.h" +#include "MediaDataDemuxer.h" +#include "nsAutoPtr.h" +#include "nsAutoRef.h" +#include "NesteggPacketHolder.h" +#include "XiphExtradata.h" +#include "prprf.h" // leaving it for PR_vsnprintf() +#include "mozilla/Sprintf.h" + +#include <algorithm> +#include <stdint.h> + +#define VPX_DONT_DEFINE_STDINT_TYPES +#include "vpx/vp8dx.h" +#include "vpx/vpx_decoder.h" + +#define WEBM_DEBUG(arg, ...) MOZ_LOG(gMediaDemuxerLog, mozilla::LogLevel::Debug, ("WebMDemuxer(%p)::%s: " arg, this, __func__, ##__VA_ARGS__)) +extern mozilla::LazyLogModule gMediaDemuxerLog; + +namespace mozilla { + +using namespace gfx; + +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 + +static Atomic<uint32_t> sStreamSourceID(0u); + +// 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, (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) +{ +} + +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; +} + +bool +WebMDemuxer::HasTrackType(TrackInfo::TrackType aType) const +{ + return !!GetNumberTracks(aType); +} + +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); + mDemuxers.AppendElement(e); + + return e.forget(); +} + +nsresult +WebMDemuxer::Reset(TrackInfo::TrackType aType) +{ + if (aType == TrackInfo::kVideoTrack) { + mVideoPackets.Reset(); + } else { + mAudioPackets.Reset(); + } + return NS_OK; +} + +nsresult +WebMDemuxer::ReadMetadata() +{ + int r = mVideoContext.Init(); + if (r == -1) { + return NS_ERROR_FAILURE; + } + if (mAudioContext.Init() == -1) { + 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) { + return NS_ERROR_FAILURE; + } + mBufferedState->NotifyDataArrived(buffer->Elements(), buffer->Length(), 0); + if (mBufferedState->GetInitEndOffset() < 0) { + return NS_ERROR_FAILURE; + } + MOZ_ASSERT(mBufferedState->GetInitEndOffset() <= resource.Tell()); + } + mInitData = resource.MediaReadAt(0, mBufferedState->GetInitEndOffset()); + if (!mInitData || + mInitData->Length() != size_t(mBufferedState->GetInitEndOffset())) { + return NS_ERROR_FAILURE; + } + + unsigned int ntracks = 0; + r = nestegg_track_count(context, &ntracks); + if (r == -1) { + return NS_ERROR_FAILURE; + } + + for (unsigned int track = 0; track < ntracks; ++track) { + int id = nestegg_track_codec_id(context, track); + if (id == -1) { + 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, ¶ms); + if (r == -1) { + return NS_ERROR_FAILURE; + } + mVideoCodec = nestegg_track_codec_id(context, track); + switch(mVideoCodec) { + case NESTEGG_CODEC_VP8: + mInfo.mVideo.mMimeType = "video/webm; codecs=vp8"; + break; + case NESTEGG_CODEC_VP9: + mInfo.mVideo.mMimeType = "video/webm; codecs=vp9"; + break; + default: + NS_WARNING("Unknown WebM video codec"); + return NS_ERROR_FAILURE; + } + // 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; + nsIntRect 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. + nsIntSize displaySize(params.display_width, params.display_height); + nsIntSize 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); + + 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 = media::TimeUnit::FromNanoseconds(duration).ToMicroseconds(); + } + mInfo.mVideo.mCrypto = GetTrackCrypto(TrackInfo::kVideoTrack, track); + if (mInfo.mVideo.mCrypto.mValid) { + mCrypto.AddInitData(NS_LITERAL_STRING("webm"), mInfo.mVideo.mCrypto.mKeyId); + } + } else if (type == NESTEGG_TRACK_AUDIO && !mHasAudio) { + nestegg_audio_params params; + r = nestegg_track_audio_params(context, track, ¶ms); + if (r == -1) { + return NS_ERROR_FAILURE; + } + + mAudioTrack = track; + mHasAudio = true; + mAudioCodec = nestegg_track_codec_id(context, track); + if (mAudioCodec == NESTEGG_CODEC_VORBIS) { + mInfo.mAudio.mMimeType = "audio/vorbis"; + } else if (mAudioCodec == NESTEGG_CODEC_OPUS) { + mInfo.mAudio.mMimeType = "audio/opus"; + OpusDataDecoder::AppendCodecDelay(mInfo.mAudio.mCodecSpecificConfig, + media::TimeUnit::FromNanoseconds(params.codec_delay).ToMicroseconds()); + } + mSeekPreroll = params.seek_preroll; + mInfo.mAudio.mRate = params.rate; + mInfo.mAudio.mChannels = params.channels; + + unsigned int nheaders = 0; + r = nestegg_track_codec_data_count(context, track, &nheaders); + if (r == -1) { + 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) { + 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. + if (nheaders > 1) { + if (!XiphHeadersToExtradata(mInfo.mAudio.mCodecSpecificConfig, + headers, headerLens)) { + return NS_ERROR_FAILURE; + } + } + else { + mInfo.mAudio.mCodecSpecificConfig->AppendElements(headers[0], + headerLens[0]); + } + uint64_t duration = 0; + r = nestegg_duration(context, &duration); + if (!r) { + mInfo.mAudio.mDuration = media::TimeUnit::FromNanoseconds(duration).ToMicroseconds(); + } + mInfo.mAudio.mCrypto = GetTrackCrypto(TrackInfo::kAudioTrack, track); + if (mInfo.mAudio.mCrypto.mValid) { + mCrypto.AddInitData(NS_LITERAL_STRING("webm"), mInfo.mAudio.mCrypto.mKeyId); + } + } + } + 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.Length()) { + 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()) { + crypto.mValid = true; + // crypto.mMode is not used for WebMs + crypto.mIVSize = WEBM_IV_SIZE; + crypto.mKeyId = Move(initData); + } + + return crypto; +} + +bool +WebMDemuxer::GetNextPacket(TrackInfo::TrackType aType, MediaRawDataQueue *aSamples) +{ + if (mIsMediaSource) { + // To ensure mLastWebMBlockOffset is properly up to date. + EnsureUpToDateIndex(); + } + + RefPtr<NesteggPacketHolder> holder(NextPacket(aType)); + + if (!holder) { + return false; + } + + int r = 0; + unsigned int count = 0; + r = nestegg_packet_count(holder->Packet(), &count); + if (r == -1) { + return false; + } + 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. + int64_t next_tstamp = INT64_MIN; + if (aType == TrackInfo::kAudioTrack) { + RefPtr<NesteggPacketHolder> next_holder(NextPacket(aType)); + if (next_holder) { + next_tstamp = next_holder->Timestamp(); + PushAudioPacket(next_holder); + } else if (duration >= 0) { + next_tstamp = tstamp + duration; + } else if (!mIsMediaSource || + (mIsMediaSource && mLastAudioFrameTime.isSome())) { + next_tstamp = tstamp; + next_tstamp += tstamp - mLastAudioFrameTime.refOr(0); + } else { + PushAudioPacket(holder); + } + mLastAudioFrameTime = Some(tstamp); + } else if (aType == TrackInfo::kVideoTrack) { + RefPtr<NesteggPacketHolder> next_holder(NextPacket(aType)); + if (next_holder) { + next_tstamp = next_holder->Timestamp(); + PushVideoPacket(next_holder); + } else if (duration >= 0) { + next_tstamp = tstamp + duration; + } else if (!mIsMediaSource || + (mIsMediaSource && mLastVideoFrameTime.isSome())) { + next_tstamp = tstamp; + next_tstamp += tstamp - mLastVideoFrameTime.refOr(0); + } else { + PushVideoPacket(holder); + } + mLastVideoFrameTime = Some(tstamp); + } + + if (mIsMediaSource && next_tstamp == INT64_MIN) { + return false; + } + + 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; + 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 false; + } + bool isKeyframe = false; + if (aType == TrackInfo::kAudioTrack) { + isKeyframe = true; + } else if (aType == TrackInfo::kVideoTrack) { + if (packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_ENCRYPTED) { + // Packet is encrypted, can't peek, use packet info + isKeyframe = nestegg_packet_has_keyframe(holder->Packet()) == NESTEGG_PACKET_HAS_KEYFRAME_TRUE; + } else { + vpx_codec_stream_info_t si; + PodZero(&si); + si.sz = sizeof(si); + switch (mVideoCodec) { + case NESTEGG_CODEC_VP8: + vpx_codec_peek_stream_info(vpx_codec_vp8_dx(), data, length, &si); + break; + case NESTEGG_CODEC_VP9: + vpx_codec_peek_stream_info(vpx_codec_vp9_dx(), data, length, &si); + break; + } + isKeyframe = si.is_kf; + if (isKeyframe) { + // We only look for resolution changes on keyframes for both VP8 and + // VP9. Other resolution changes are invalid. + if (mLastSeenFrameWidth.isSome() && mLastSeenFrameHeight.isSome() && + (si.w != mLastSeenFrameWidth.value() || + si.h != mLastSeenFrameHeight.value())) { + mInfo.mVideo.mDisplay = nsIntSize(si.w, si.h); + mSharedVideoTrackInfo = new SharedTrackInfo(mInfo.mVideo, ++sStreamSourceID); + } + mLastSeenFrameWidth = Some(si.w); + mLastSeenFrameHeight = Some(si.h); + } + } + } + + WEBM_DEBUG("push sample tstamp: %ld next_tstamp: %ld length: %ld kf: %d", + tstamp, next_tstamp, length, isKeyframe); + RefPtr<MediaRawData> sample = new MediaRawData(data, length); + if (length && !sample->Data()) { + // OOM. + return false; + } + sample->mTimecode = tstamp; + sample->mTime = tstamp; + sample->mDuration = next_tstamp - tstamp; + sample->mOffset = holder->Offset(); + sample->mKeyframe = isKeyframe; + if (discardPadding && i == count - 1) { + CheckedInt64 discardFrames; + if (discardPadding < 0) { + // This is an invalid value as discard padding should never be negative. + // Set to maximum value so that the decoder will reject it as it's + // greater than the number of frames available. + discardFrames = INT32_MAX; + WEBM_DEBUG("Invalid negative discard padding"); + } else { + discardFrames = TimeUnitToFrames( + media::TimeUnit::FromNanoseconds(discardPadding), mInfo.mAudio.mRate); + } + if (discardFrames.isValid()) { + sample->mDiscardPadding = discardFrames.value(); + } + } + + if (packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_UNENCRYPTED || + packetEncryption == NESTEGG_PACKET_HAS_SIGNAL_BYTE_ENCRYPTED) { + nsAutoPtr<MediaRawDataWriter> writer(sample->CreateWriter()); + unsigned char const* iv; + size_t ivLength; + nestegg_packet_iv(holder->Packet(), &iv, &ivLength); + writer->mCrypto.mValid = true; + writer->mCrypto.mIVSize = ivLength; + if (ivLength == 0) { + // Frame is not encrypted + 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); + } + writer->mCrypto.mPlainSizes.AppendElement(0); + writer->mCrypto.mEncryptedSizes.AppendElement(length); + } + } + if (aType == TrackInfo::kVideoTrack) { + sample->mTrackInfo = mSharedVideoTrackInfo; + } + aSamples->Push(sample); + } + return true; +} + +RefPtr<NesteggPacketHolder> +WebMDemuxer::NextPacket(TrackInfo::TrackType aType) +{ + 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) { + return nullptr; + } + + // The packet queue for the type that we are interested in. + WebMPacketQueue &packets = isVideo ? mVideoPackets : mAudioPackets; + + if (packets.GetSize() > 0) { + return packets.PopFront(); + } + + // Track we are interested in + uint32_t ourTrack = isVideo ? mVideoTrack : mAudioTrack; + + do { + RefPtr<NesteggPacketHolder> holder = DemuxPacket(aType); + if (!holder) { + return nullptr; + } + + if (ourTrack == holder->Track()) { + return holder; + } + } while (true); +} + +RefPtr<NesteggPacketHolder> +WebMDemuxer::DemuxPacket(TrackInfo::TrackType aType) +{ + nestegg_packet* packet; + int r = nestegg_read_packet(Context(aType), &packet); + if (r == 0) { + nestegg_read_reset(Context(aType)); + return nullptr; + } else if (r < 0) { + return nullptr; + } + + unsigned int track = 0; + r = nestegg_packet_track(packet, &track); + if (r == -1) { + return nullptr; + } + + int64_t offset = Resource(aType).Tell(); + RefPtr<NesteggPacketHolder> holder = new NesteggPacketHolder(); + if (!holder->Init(packet, offset, track, false)) { + return nullptr; + } + + return holder; +} + +void +WebMDemuxer::PushAudioPacket(NesteggPacketHolder* aItem) +{ + mAudioPackets.PushFront(aItem); +} + +void +WebMDemuxer::PushVideoPacket(NesteggPacketHolder* aItem) +{ + mVideoPackets.PushFront(aItem); +} + +nsresult +WebMDemuxer::SeekInternal(TrackInfo::TrackType aType, + const media::TimeUnit& aTarget) +{ + EnsureUpToDateIndex(); + uint32_t trackToSeek = mHasVideo ? mVideoTrack : mAudioTrack; + uint64_t target = aTarget.ToNanoseconds(); + + if (NS_FAILED(Reset(aType))) { + return NS_ERROR_FAILURE; + } + + if (mSeekPreroll) { + uint64_t startTime = 0; + if (!mBufferedState->GetStartTime(&startTime)) { + startTime = 0; + } + WEBM_DEBUG("Seek Target: %f", + media::TimeUnit::FromNanoseconds(target).ToSeconds()); + if (target < mSeekPreroll || target - mSeekPreroll < startTime) { + target = startTime; + } else { + target -= mSeekPreroll; + } + WEBM_DEBUG("SeekPreroll: %f StartTime: %f Adjusted Target: %f", + media::TimeUnit::FromNanoseconds(mSeekPreroll).ToSeconds(), + media::TimeUnit::FromNanoseconds(startTime).ToSeconds(), + media::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, + media::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; + } + + r = nestegg_offset_seek(Context(aType), 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; +} + +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", + media::TimeUnit::FromNanoseconds(duration).ToSeconds(), + media::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", + media::TimeUnit::FromNanoseconds(end).ToSeconds(), + media::TimeUnit::FromNanoseconds(duration).ToSeconds()); + end = duration; + } + media::TimeUnit startTime = media::TimeUnit::FromNanoseconds(start); + media::TimeUnit endTime = media::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(media::TimeUnit aTime) +{ + // Seeks to aTime. Upon success, SeekPromise will be resolved with the + // actual time seeked to. Typically the random access point time + + media::TimeUnit seekTime = aTime; + mSamples.Reset(); + mParent->SeekInternal(mType, aTime); + mParent->GetNextPacket(mType, &mSamples); + mNeedKeyframe = true; + + // Check what time we actually seeked to. + if (mSamples.GetSize() > 0) { + const RefPtr<MediaRawData>& sample = mSamples.First(); + seekTime = media::TimeUnit::FromMicroseconds(sample->mTime); + } + SetNextKeyFrameTime(); + + return SeekPromise::CreateAndResolve(seekTime, __func__); +} + +RefPtr<MediaRawData> +WebMTrackDemuxer::NextSample() +{ + while (mSamples.GetSize() < 1 && mParent->GetNextPacket(mType, &mSamples)) { + } + if (mSamples.GetSize()) { + return mSamples.PopFront(); + } + return nullptr; +} + +RefPtr<WebMTrackDemuxer::SamplesPromise> +WebMTrackDemuxer::GetSamples(int32_t aNumSamples) +{ + RefPtr<SamplesHolder> samples = new SamplesHolder; + MOZ_ASSERT(aNumSamples); + + while (aNumSamples) { + RefPtr<MediaRawData> sample(NextSample()); + if (!sample) { + break; + } + if (mNeedKeyframe && !sample->mKeyframe) { + continue; + } + mNeedKeyframe = false; + samples->mSamples.AppendElement(sample); + aNumSamples--; + } + + if (samples->mSamples.IsEmpty()) { + return SamplesPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_END_OF_STREAM, __func__); + } else { + UpdateSamples(samples->mSamples); + return SamplesPromise::CreateAndResolve(samples, __func__); + } +} + +void +WebMTrackDemuxer::SetNextKeyFrameTime() +{ + if (mType != TrackInfo::kVideoTrack || mParent->IsMediaSource()) { + return; + } + + int64_t frameTime = -1; + + 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); + } + // Demux and buffer frames until we find a keyframe. + RefPtr<MediaRawData> sample; + while (!foundKeyframe && (sample = NextSample())) { + if (sample->mKeyframe) { + frameTime = sample->mTime; + foundKeyframe = true; + } + int64_t sampleTimecode = sample->mTimecode; + 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(Move(skipSamplesQueue)); + + if (frameTime != -1) { + mNextKeyframeTime.emplace(media::TimeUnit::FromMicroseconds(frameTime)); + WEBM_DEBUG("Next Keyframe %f (%u queued %.02fs)", + mNextKeyframeTime.value().ToSeconds(), + uint32_t(mSamples.GetSize()), + media::TimeUnit::FromMicroseconds(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.Length()) { + WEBM_DEBUG("Seek to start point: %f", buffered.Start(0).ToSeconds()); + mParent->SeekInternal(mType, buffered.Start(0)); + SetNextKeyFrameTime(); + } else { + mNextKeyframeTime.reset(); + } +} + +void +WebMTrackDemuxer::UpdateSamples(nsTArray<RefPtr<MediaRawData>>& aSamples) +{ + for (const auto& sample : aSamples) { + if (sample->mCrypto.mValid) { + nsAutoPtr<MediaRawDataWriter> writer(sample->CreateWriter()); + writer->mCrypto.mMode = mInfo->mCrypto.mMode; + writer->mCrypto.mIVSize = mInfo->mCrypto.mIVSize; + writer->mCrypto.mKeyId.AppendElements(mInfo->mCrypto.mKeyId); + } + } + if (mNextKeyframeTime.isNothing() || + aSamples.LastElement()->mTime >= mNextKeyframeTime.value().ToMicroseconds()) { + SetNextKeyFrameTime(); + } +} + +nsresult +WebMTrackDemuxer::GetNextRandomAccessPoint(media::TimeUnit* aTime) +{ + if (mNextKeyframeTime.isNothing()) { + // There's no next key frame. + *aTime = + media::TimeUnit::FromMicroseconds(std::numeric_limits<int64_t>::max()); + } else { + *aTime = mNextKeyframeTime.ref(); + } + return NS_OK; +} + +RefPtr<WebMTrackDemuxer::SkipAccessPointPromise> +WebMTrackDemuxer::SkipToNextRandomAccessPoint(media::TimeUnit aTimeThreshold) +{ + uint32_t parsed = 0; + bool found = false; + RefPtr<MediaRawData> sample; + int64_t sampleTime; + + WEBM_DEBUG("TimeThreshold: %f", aTimeThreshold.ToSeconds()); + while (!found && (sample = NextSample())) { + parsed++; + sampleTime = sample->mTime; + if (sample->mKeyframe && sampleTime >= aTimeThreshold.ToMicroseconds()) { + found = true; + mSamples.Reset(); + mSamples.PushFront(sample.forget()); + } + } + SetNextKeyFrameTime(); + if (found) { + WEBM_DEBUG("next sample: %f (parsed: %d)", + media::TimeUnit::FromMicroseconds(sampleTime).ToSeconds(), + parsed); + return SkipAccessPointPromise::CreateAndResolve(parsed, __func__); + } else { + SkipFailureHolder failure(NS_ERROR_DOM_MEDIA_END_OF_STREAM, parsed); + return SkipAccessPointPromise::CreateAndReject(Move(failure), __func__); + } +} + +media::TimeIntervals +WebMTrackDemuxer::GetBuffered() +{ + return mParent->GetBuffered(); +} + +void +WebMTrackDemuxer::BreakCycles() +{ + mParent = nullptr; +} + +int64_t +WebMTrackDemuxer::GetEvictionOffset(const media::TimeUnit& aTime) +{ + int64_t offset; + if (!mParent->GetOffsetForTime(aTime.ToNanoseconds(), &offset)) { + return 0; + } + + return offset; +} + +#undef WEBM_DEBUG +} // namespace mozilla |