summaryrefslogtreecommitdiffstats
path: root/dom/media/webm/WebMDemuxer.h
diff options
context:
space:
mode:
Diffstat (limited to 'dom/media/webm/WebMDemuxer.h')
-rw-r--r--dom/media/webm/WebMDemuxer.h288
1 files changed, 288 insertions, 0 deletions
diff --git a/dom/media/webm/WebMDemuxer.h b/dom/media/webm/WebMDemuxer.h
new file mode 100644
index 0000000000..3d8ff67f9e
--- /dev/null
+++ b/dom/media/webm/WebMDemuxer.h
@@ -0,0 +1,288 @@
+/* -*- 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/. */
+#ifndef WebMDemuxer_h_
+#define WebMDemuxer_h_
+
+#include "nsTArray.h"
+#include "MediaDataDemuxer.h"
+#include "MediaResource.h"
+#include "NesteggPacketHolder.h"
+
+#include <deque>
+#include <stdint.h>
+#include <utility>
+
+typedef struct nestegg nestegg;
+
+namespace mozilla {
+
+class WebMBufferedState;
+
+// Queue for holding MediaRawData samples
+class MediaRawDataQueue {
+ typedef std::deque<RefPtr<MediaRawData>> ContainerType;
+
+ public:
+ uint32_t GetSize() { return mQueue.size(); }
+
+ void Push(MediaRawData* aItem) { mQueue.push_back(aItem); }
+
+ void Push(already_AddRefed<MediaRawData>&& aItem) {
+ mQueue.push_back(std::move(aItem));
+ }
+
+ void PushFront(MediaRawData* aItem) { mQueue.push_front(aItem); }
+
+ void PushFront(already_AddRefed<MediaRawData>&& aItem) {
+ mQueue.push_front(std::move(aItem));
+ }
+
+ void PushFront(MediaRawDataQueue&& aOther) {
+ while (!aOther.mQueue.empty()) {
+ PushFront(aOther.Pop());
+ }
+ }
+
+ already_AddRefed<MediaRawData> PopFront() {
+ RefPtr<MediaRawData> result = std::move(mQueue.front());
+ mQueue.pop_front();
+ return result.forget();
+ }
+
+ already_AddRefed<MediaRawData> Pop() {
+ RefPtr<MediaRawData> result = std::move(mQueue.back());
+ mQueue.pop_back();
+ return result.forget();
+ }
+
+ void Reset() {
+ while (!mQueue.empty()) {
+ mQueue.pop_front();
+ }
+ }
+
+ MediaRawDataQueue& operator=(const MediaRawDataQueue& aOther) = delete;
+
+ const RefPtr<MediaRawData>& First() const { return mQueue.front(); }
+
+ const RefPtr<MediaRawData>& Last() const { return mQueue.back(); }
+
+ // Methods for range-based for loops.
+ ContainerType::iterator begin() { return mQueue.begin(); }
+
+ ContainerType::const_iterator begin() const { return mQueue.begin(); }
+
+ ContainerType::iterator end() { return mQueue.end(); }
+
+ ContainerType::const_iterator end() const { return mQueue.end(); }
+
+ private:
+ ContainerType mQueue;
+};
+
+class WebMTrackDemuxer;
+
+DDLoggedTypeDeclNameAndBase(WebMDemuxer, MediaDataDemuxer);
+DDLoggedTypeNameAndBase(WebMTrackDemuxer, MediaTrackDemuxer);
+
+class WebMDemuxer : public MediaDataDemuxer,
+ public DecoderDoctorLifeLogger<WebMDemuxer> {
+ public:
+ explicit WebMDemuxer(MediaResource* aResource);
+ // Indicate if the WebMDemuxer is to be used with MediaSource. In which
+ // case the demuxer will stop reads to the last known complete block.
+ WebMDemuxer(MediaResource* aResource, bool aIsMediaSource);
+
+ RefPtr<InitPromise> Init() override;
+
+ uint32_t GetNumberTracks(TrackInfo::TrackType aType) const override;
+
+ UniquePtr<TrackInfo> GetTrackInfo(TrackInfo::TrackType aType,
+ size_t aTrackNumber) const;
+
+ already_AddRefed<MediaTrackDemuxer> GetTrackDemuxer(
+ TrackInfo::TrackType aType, uint32_t aTrackNumber) override;
+
+ bool IsSeekable() const override;
+
+ bool IsSeekableOnlyInBufferedRanges() const override;
+
+ UniquePtr<EncryptionInfo> GetCrypto() override;
+
+ bool GetOffsetForTime(uint64_t aTime, int64_t* aOffset);
+
+ // Demux next WebM packet and append samples to MediaRawDataQueue
+ nsresult GetNextPacket(TrackInfo::TrackType aType,
+ MediaRawDataQueue* aSamples);
+
+ void Reset(TrackInfo::TrackType aType);
+
+ // Pushes a packet to the front of the audio packet queue.
+ void PushAudioPacket(NesteggPacketHolder* aItem);
+
+ // Pushes a packet to the front of the video packet queue.
+ void PushVideoPacket(NesteggPacketHolder* aItem);
+
+ // Public accessor for nestegg callbacks
+ bool IsMediaSource() const { return mIsMediaSource; }
+
+ int64_t LastWebMBlockOffset() const { return mLastWebMBlockOffset; }
+
+ struct NestEggContext {
+ NestEggContext(WebMDemuxer* aParent, MediaResource* aResource)
+ : mParent(aParent), mResource(aResource), mContext(nullptr) {}
+
+ ~NestEggContext();
+
+ int Init();
+
+ // Public accessor for nestegg callbacks
+
+ bool IsMediaSource() const { return mParent->IsMediaSource(); }
+ MediaResourceIndex* GetResource() { return &mResource; }
+
+ int64_t GetEndDataOffset() const {
+ return (!mParent->IsMediaSource() || mParent->LastWebMBlockOffset() < 0)
+ ? mResource.GetLength()
+ : mParent->LastWebMBlockOffset();
+ }
+
+ WebMDemuxer* mParent;
+ MediaResourceIndex mResource;
+ nestegg* mContext;
+ };
+
+ private:
+ friend class WebMTrackDemuxer;
+
+ ~WebMDemuxer();
+ void InitBufferedState();
+ nsresult ReadMetadata();
+ void NotifyDataArrived() override;
+ void NotifyDataRemoved() override;
+ void EnsureUpToDateIndex();
+
+ // A helper to catch bad intervals during `GetBuffered`.
+ // Verifies if the interval given by start and end is valid, returning true if
+ // it is, or false if not. Logs failure reason if the interval is invalid.
+ bool IsBufferedIntervalValid(uint64_t start, uint64_t end);
+
+ media::TimeIntervals GetBuffered();
+ nsresult SeekInternal(TrackInfo::TrackType aType,
+ const media::TimeUnit& aTarget);
+ CryptoTrack GetTrackCrypto(TrackInfo::TrackType aType, size_t aTrackNumber);
+
+ // Read a packet from the nestegg file. Returns nullptr if all packets for
+ // the particular track have been read. Pass TrackInfo::kVideoTrack or
+ // TrackInfo::kVideoTrack to indicate the type of the packet we want to read.
+ nsresult NextPacket(TrackInfo::TrackType aType,
+ RefPtr<NesteggPacketHolder>& aPacket);
+
+ // Internal method that demuxes the next packet from the stream. The caller
+ // is responsible for making sure it doesn't get lost.
+ nsresult DemuxPacket(TrackInfo::TrackType aType,
+ RefPtr<NesteggPacketHolder>& aPacket);
+
+ // libnestegg audio and video context for webm container.
+ // Access on reader's thread only.
+ NestEggContext mVideoContext;
+ NestEggContext mAudioContext;
+ MediaResourceIndex& Resource(TrackInfo::TrackType aType) {
+ return aType == TrackInfo::kVideoTrack ? mVideoContext.mResource
+ : mAudioContext.mResource;
+ }
+ nestegg* Context(TrackInfo::TrackType aType) const {
+ return aType == TrackInfo::kVideoTrack ? mVideoContext.mContext
+ : mAudioContext.mContext;
+ }
+
+ MediaInfo mInfo;
+ nsTArray<RefPtr<WebMTrackDemuxer>> mDemuxers;
+
+ // Parser state and computed offset-time mappings. Shared by multiple
+ // readers when decoder has been cloned. Main thread only.
+ RefPtr<WebMBufferedState> mBufferedState;
+ RefPtr<MediaByteBuffer> mInitData;
+
+ // Queue of video and audio packets that have been read but not decoded.
+ WebMPacketQueue mVideoPackets;
+ WebMPacketQueue mAudioPackets;
+
+ // Index of video and audio track to play
+ uint32_t mVideoTrack;
+ uint32_t mAudioTrack;
+
+ // Nanoseconds to discard after seeking.
+ uint64_t mSeekPreroll;
+
+ // Calculate the frame duration from the last decodeable frame using the
+ // previous frame's timestamp. In NS.
+ Maybe<int64_t> mLastAudioFrameTime;
+ Maybe<int64_t> mLastVideoFrameTime;
+
+ // Codec ID of audio track
+ int mAudioCodec;
+ // Codec ID of video track
+ int mVideoCodec;
+
+ // Booleans to indicate if we have audio and/or video data
+ bool mHasVideo;
+ bool mHasAudio;
+ bool mNeedReIndex;
+
+ // The last complete block parsed by the WebMBufferedState. -1 if not set.
+ // We cache those values rather than retrieving them for performance reasons
+ // as nestegg only performs 1-byte read at a time.
+ int64_t mLastWebMBlockOffset;
+ const bool mIsMediaSource;
+
+ EncryptionInfo mCrypto;
+};
+
+class WebMTrackDemuxer : public MediaTrackDemuxer,
+ public DecoderDoctorLifeLogger<WebMTrackDemuxer> {
+ public:
+ WebMTrackDemuxer(WebMDemuxer* aParent, TrackInfo::TrackType aType,
+ uint32_t aTrackNumber);
+
+ UniquePtr<TrackInfo> GetInfo() const override;
+
+ RefPtr<SeekPromise> Seek(const media::TimeUnit& aTime) override;
+
+ RefPtr<SamplesPromise> GetSamples(int32_t aNumSamples = 1) override;
+
+ void Reset() override;
+
+ nsresult GetNextRandomAccessPoint(media::TimeUnit* aTime) override;
+
+ RefPtr<SkipAccessPointPromise> SkipToNextRandomAccessPoint(
+ const media::TimeUnit& aTimeThreshold) override;
+
+ media::TimeIntervals GetBuffered() override;
+
+ int64_t GetEvictionOffset(const media::TimeUnit& aTime) override;
+
+ void BreakCycles() override;
+
+ private:
+ friend class WebMDemuxer;
+ ~WebMTrackDemuxer();
+ void UpdateSamples(const nsTArray<RefPtr<MediaRawData>>& aSamples);
+ void SetNextKeyFrameTime();
+ nsresult NextSample(RefPtr<MediaRawData>& aData);
+ RefPtr<WebMDemuxer> mParent;
+ TrackInfo::TrackType mType;
+ UniquePtr<TrackInfo> mInfo;
+ Maybe<media::TimeUnit> mNextKeyframeTime;
+ bool mNeedKeyframe;
+
+ // Queued samples extracted by the demuxer, but not yet returned.
+ MediaRawDataQueue mSamples;
+};
+
+} // namespace mozilla
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-13 14:06:00 +0000