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- // Copyright (c) 2016 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STATE_H_
- #define MEDIA_FILTERS_SOURCE_BUFFER_STATE_H_
- #include "base/bind.h"
- #include "base/memory/memory_pressure_listener.h"
- #include "base/memory/raw_ptr.h"
- #include "base/time/time.h"
- #include "media/base/audio_codecs.h"
- #include "media/base/demuxer.h"
- #include "media/base/demuxer_stream.h"
- #include "media/base/media_export.h"
- #include "media/base/media_log.h"
- #include "media/base/stream_parser.h"
- #include "media/base/stream_parser_buffer.h"
- #include "media/base/video_codecs.h"
- #include "media/filters/source_buffer_parse_warnings.h"
- namespace media {
- class ChunkDemuxerStream;
- class FrameProcessor;
- // Contains state belonging to a source id.
- class MEDIA_EXPORT SourceBufferState {
- public:
- // Callback signature used to create ChunkDemuxerStreams.
- using CreateDemuxerStreamCB =
- base::RepeatingCallback<ChunkDemuxerStream*(DemuxerStream::Type)>;
- using NewTextTrackCB = base::RepeatingCallback<void(ChunkDemuxerStream*,
- const TextTrackConfig&)>;
- SourceBufferState(std::unique_ptr<StreamParser> stream_parser,
- std::unique_ptr<FrameProcessor> frame_processor,
- CreateDemuxerStreamCB create_demuxer_stream_cb,
- MediaLog* media_log);
- SourceBufferState(const SourceBufferState&) = delete;
- SourceBufferState& operator=(const SourceBufferState&) = delete;
- ~SourceBufferState();
- void Init(StreamParser::InitCB init_cb,
- const std::string& expected_codecs,
- const StreamParser::EncryptedMediaInitDataCB&
- encrypted_media_init_data_cb,
- NewTextTrackCB new_text_track_cb);
- // Reconfigures this source buffer to use |new_stream_parser|. Caller must
- // first ensure that ResetParserState() was done to flush any pending frames
- // from the old stream parser.
- void ChangeType(std::unique_ptr<StreamParser> new_stream_parser,
- const std::string& new_expected_codecs);
- // Appends new data to the StreamParser.
- // Returns true if the data was successfully appended. Returns false if an
- // error occurred. |*timestamp_offset| is used and possibly updated by the
- // append. |append_window_start| and |append_window_end| correspond to the MSE
- // spec's similarly named source buffer attributes that are used in coded
- // frame processing.
- // AppendChunks appends the provided BufferQueue.
- bool Append(const uint8_t* data,
- size_t length,
- base::TimeDelta append_window_start,
- base::TimeDelta append_window_end,
- base::TimeDelta* timestamp_offset);
- bool AppendChunks(std::unique_ptr<StreamParser::BufferQueue> buffer_queue,
- base::TimeDelta append_window_start,
- base::TimeDelta append_window_end,
- base::TimeDelta* timestamp_offset);
- // Aborts the current append sequence and resets the parser.
- void ResetParserState(base::TimeDelta append_window_start,
- base::TimeDelta append_window_end,
- base::TimeDelta* timestamp_offset);
- // Calls Remove(|start|, |end|, |duration|) on all
- // ChunkDemuxerStreams managed by this object.
- void Remove(base::TimeDelta start,
- base::TimeDelta end,
- base::TimeDelta duration);
- // If the buffer is full, attempts to try to free up space, as specified in
- // the "Coded Frame Eviction Algorithm" in the Media Source Extensions Spec.
- // Returns false iff buffer is still full after running eviction.
- // https://w3c.github.io/media-source/#sourcebuffer-coded-frame-eviction
- bool EvictCodedFrames(base::TimeDelta media_time, size_t newDataSize);
- // Gets invoked when the system is experiencing memory pressure, i.e. there's
- // not enough free memory. The |media_time| is the media playback position at
- // the time of memory pressure notification (needed for accurate GC). The
- // |memory_pressure_level| indicates memory pressure severity. The
- // |force_instant_gc| is used to force the MSE garbage collection algorithm to
- // be run right away, without waiting for the next append.
- void OnMemoryPressure(
- base::TimeDelta media_time,
- base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level,
- bool force_instant_gc);
- // Returns true if currently parsing a media segment, or false otherwise.
- bool parsing_media_segment() const { return parsing_media_segment_; }
- // Returns the 'Generate Timestamps Flag' for this SourceBuffer's byte stream
- // format parser as described in the MSE Byte Stream Format Registry.
- bool generate_timestamps_flag() const {
- return stream_parser_->GetGenerateTimestampsFlag();
- }
- // Sets |frame_processor_|'s sequence mode to |sequence_mode|.
- void SetSequenceMode(bool sequence_mode);
- // Signals the coded frame processor to update its group start timestamp to be
- // |timestamp_offset| if it is in sequence append mode.
- void SetGroupStartTimestampIfInSequenceMode(base::TimeDelta timestamp_offset);
- // Returns the range of buffered data in this source, capped at |duration|.
- // |ended| - Set to true if end of stream has been signaled and the special
- // end of stream range logic needs to be executed.
- Ranges<base::TimeDelta> GetBufferedRanges(base::TimeDelta duration,
- bool ended) const;
- // Returns the highest PTS of currently buffered frames in this source, or
- // base::TimeDelta() if none of the streams contain buffered data.
- base::TimeDelta GetHighestPresentationTimestamp() const;
- // Returns the highest buffered duration across all streams managed
- // by this object.
- // Returns base::TimeDelta() if none of the streams contain buffered data.
- base::TimeDelta GetMaxBufferedDuration() const;
- // Helper methods that call methods with similar names on all the
- // ChunkDemuxerStreams managed by this object.
- void StartReturningData();
- void AbortReads();
- void Seek(base::TimeDelta seek_time);
- void CompletePendingReadIfPossible();
- void OnSetDuration(base::TimeDelta duration);
- void MarkEndOfStream();
- void UnmarkEndOfStream();
- void Shutdown();
- // Sets the memory limit on each stream of a specific type.
- // |memory_limit| is the maximum number of bytes each stream of type |type|
- // is allowed to hold in its buffer.
- void SetMemoryLimits(DemuxerStream::Type type, size_t memory_limit);
- bool IsSeekWaitingForData() const;
- using RangesList = std::vector<Ranges<base::TimeDelta>>;
- static Ranges<base::TimeDelta> ComputeRangesIntersection(
- const RangesList& active_ranges,
- bool ended);
- void SetTracksWatcher(Demuxer::MediaTracksUpdatedCB tracks_updated_cb);
- void SetParseWarningCallback(SourceBufferParseWarningCB parse_warning_cb);
- private:
- // State advances through this list to PARSER_INITIALIZED.
- // The intent is to ensure at least one config is received prior to parser
- // calling initialization callback, and that such initialization callback
- // occurs at most once per parser.
- // PENDING_PARSER_RECONFIG occurs if State had reached PARSER_INITIALIZED
- // before changing to a new StreamParser in ChangeType(). In such case, State
- // would then advance to PENDING_PARSER_REINIT, then PARSER_INITIALIZED upon
- // the next initialization segment parsed, but would not run the
- // initialization callback in this case (since such would already have
- // occurred on the initial transition from PENDING_PARSER_INIT to
- // PARSER_INITIALIZED.)
- enum State {
- UNINITIALIZED = 0,
- PENDING_PARSER_CONFIG,
- PENDING_PARSER_INIT,
- PARSER_INITIALIZED,
- PENDING_PARSER_RECONFIG,
- PENDING_PARSER_REINIT
- };
- // Initializes |stream_parser_|. Also, updates |expected_audio_codecs| and
- // |expected_video_codecs|.
- void InitializeParser(const std::string& expected_codecs);
- // Called by the |stream_parser_| when a new initialization segment is
- // encountered.
- // Returns true on a successful call. Returns false if an error occurred while
- // processing decoder configurations.
- bool OnNewConfigs(std::string expected_codecs,
- std::unique_ptr<MediaTracks> tracks,
- const StreamParser::TextTrackConfigMap& text_configs);
- // Called by the |stream_parser_| at the beginning of a new media segment.
- void OnNewMediaSegment();
- // Called by the |stream_parser_| at the end of a media segment.
- void OnEndOfMediaSegment();
- // Called by the |stream_parser_| when new buffers have been parsed.
- // It processes the new buffers using |frame_processor_|, which includes
- // appending the processed frames to associated demuxer streams for each
- // frame's track.
- // Returns true on a successful call. Returns false if an error occurred while
- // processing the buffers.
- bool OnNewBuffers(const StreamParser::BufferQueueMap& buffer_queue_map);
- // Called when StreamParser encounters encrypted media init data.
- void OnEncryptedMediaInitData(EmeInitDataType type,
- const std::vector<uint8_t>& init_data);
- void OnSourceInitDone(const StreamParser::InitParameters& params);
- // Sets memory limits for all demuxer streams.
- void SetStreamMemoryLimits();
- // Tracks the number of MEDIA_LOGs emitted for segments missing expected audio
- // or video blocks. Useful to prevent log spam.
- int num_missing_track_logs_ = 0;
- // During Append(), if OnNewBuffers() coded frame processing updates the
- // timestamp offset then |*timestamp_offset_during_append_| is also updated
- // so Append()'s caller can know the new offset. This pointer is only non-NULL
- // during the lifetime of an Append() call.
- raw_ptr<base::TimeDelta> timestamp_offset_during_append_;
- // During Append(), coded frame processing triggered by OnNewBuffers()
- // requires these two attributes. These are only valid during the lifetime of
- // an Append() call.
- base::TimeDelta append_window_start_during_append_;
- base::TimeDelta append_window_end_during_append_;
- // Keeps track of whether a media segment is being parsed.
- bool parsing_media_segment_;
- // Valid only while |parsing_media_segment_| is true. These flags enable
- // warning when the parsed media segment doesn't have frames for some track.
- std::map<StreamParser::TrackId, bool> media_segment_has_data_for_track_;
- // The object used to parse appended data.
- std::unique_ptr<StreamParser> stream_parser_;
- // Note that ChunkDemuxerStreams are created and owned by the parent
- // ChunkDemuxer. They are not owned by |this|.
- using DemuxerStreamMap = std::map<StreamParser::TrackId, ChunkDemuxerStream*>;
- DemuxerStreamMap audio_streams_;
- DemuxerStreamMap video_streams_;
- DemuxerStreamMap text_streams_;
- std::unique_ptr<FrameProcessor> frame_processor_;
- const CreateDemuxerStreamCB create_demuxer_stream_cb_;
- raw_ptr<MediaLog> media_log_;
- StreamParser::InitCB init_cb_;
- StreamParser::EncryptedMediaInitDataCB encrypted_media_init_data_cb_;
- NewTextTrackCB new_text_track_cb_;
- State state_;
- // During Append(), OnNewConfigs() will trigger the initialization segment
- // received algorithm. Note, the MSE spec explicitly disallows this algorithm
- // during an Abort(), since Abort() is allowed only to emit coded frames, and
- // only if the parser is PARSING_MEDIA_SEGMENT (not an INIT segment). So we
- // also have a flag here that indicates if Append is in progress and we can
- // invoke this callback.
- Demuxer::MediaTracksUpdatedCB init_segment_received_cb_;
- bool append_in_progress_ = false;
- bool first_init_segment_received_ = false;
- bool encrypted_media_init_data_reported_ = false;
- std::vector<AudioCodec> expected_audio_codecs_;
- std::vector<VideoCodec> expected_video_codecs_;
- };
- } // namespace media
- #endif // MEDIA_FILTERS_SOURCE_BUFFER_STATE_H_
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