| // Copyright (c) 2012 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_CHUNK_DEMUXER_H_ |
| #define MEDIA_FILTERS_CHUNK_DEMUXER_H_ |
| |
| #include <map> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include "base/synchronization/lock.h" |
| #include "media/base/byte_queue.h" |
| #include "media/base/demuxer.h" |
| #include "media/base/ranges.h" |
| #include "media/base/stream_parser.h" |
| #include "media/base/text_track.h" |
| #include "media/filters/source_buffer_stream.h" |
| |
| namespace media { |
| |
| class ChunkDemuxerStream; |
| class FFmpegURLProtocol; |
| class SourceState; |
| |
| // Demuxer implementation that allows chunks of media data to be passed |
| // from JavaScript to the media stack. |
| class MEDIA_EXPORT ChunkDemuxer : public Demuxer { |
| public: |
| enum Status { |
| kOk, // ID added w/o error. |
| kNotSupported, // Type specified is not supported. |
| kReachedIdLimit, // Reached ID limit. We can't handle any more IDs. |
| }; |
| |
| // |open_cb| Run when Initialize() is called to signal that the demuxer |
| // is ready to receive media data via AppenData(). |
| // |need_key_cb| Run when the demuxer determines that an encryption key is |
| // needed to decrypt the content. |
| // |add_text_track_cb| Run when demuxer detects the presence of an inband |
| // text track. |
| // |log_cb| Run when parsing error messages need to be logged to the error |
| // console. |
| ChunkDemuxer(const base::Closure& open_cb, |
| const NeedKeyCB& need_key_cb, |
| const AddTextTrackCB& add_text_track_cb, |
| const LogCB& log_cb); |
| virtual ~ChunkDemuxer(); |
| |
| // Demuxer implementation. |
| virtual void Initialize(DemuxerHost* host, |
| const PipelineStatusCB& cb) OVERRIDE; |
| virtual void Stop(const base::Closure& callback) OVERRIDE; |
| virtual void Seek(base::TimeDelta time, const PipelineStatusCB& cb) OVERRIDE; |
| virtual void OnAudioRendererDisabled() OVERRIDE; |
| virtual DemuxerStream* GetStream(DemuxerStream::Type type) OVERRIDE; |
| virtual base::TimeDelta GetStartTime() const OVERRIDE; |
| |
| // Methods used by an external object to control this demuxer. |
| // |
| // Indicates that a new Seek() call is on its way. Any pending Reads on the |
| // DemuxerStream objects should be aborted immediately inside this call and |
| // future Read calls should return kAborted until the Seek() call occurs. |
| // This method MUST ALWAYS be called before Seek() is called to signal that |
| // the next Seek() call represents the seek point we actually want to return |
| // data for. |
| // |seek_time| - The presentation timestamp for the seek that triggered this |
| // call. It represents the most recent position the caller is trying to seek |
| // to. |
| void StartWaitingForSeek(base::TimeDelta seek_time); |
| |
| // Indicates that a Seek() call is on its way, but another seek has been |
| // requested that will override the impending Seek() call. Any pending Reads |
| // on the DemuxerStream objects should be aborted immediately inside this call |
| // and future Read calls should return kAborted until the next |
| // StartWaitingForSeek() call. This method also arranges for the next Seek() |
| // call received before a StartWaitingForSeek() call to immediately call its |
| // callback without waiting for any data. |
| // |seek_time| - The presentation timestamp for the seek request that |
| // triggered this call. It represents the most recent position the caller is |
| // trying to seek to. |
| void CancelPendingSeek(base::TimeDelta seek_time); |
| |
| // Registers a new |id| to use for AppendData() calls. |type| indicates |
| // the MIME type for the data that we intend to append for this ID. |
| // kOk is returned if the demuxer has enough resources to support another ID |
| // and supports the format indicated by |type|. |
| // kNotSupported is returned if |type| is not a supported format. |
| // kReachedIdLimit is returned if the demuxer cannot handle another ID right |
| // now. |
| Status AddId(const std::string& id, const std::string& type, |
| std::vector<std::string>& codecs); |
| |
| // Removed an ID & associated resources that were previously added with |
| // AddId(). |
| void RemoveId(const std::string& id); |
| |
| // Gets the currently buffered ranges for the specified ID. |
| Ranges<base::TimeDelta> GetBufferedRanges(const std::string& id) const; |
| |
| // Appends media data to the source buffer associated with |id|. |
| void AppendData(const std::string& id, const uint8* data, size_t length); |
| |
| // Aborts parsing the current segment and reset the parser to a state where |
| // it can accept a new segment. |
| void Abort(const std::string& id); |
| |
| // Remove buffers between |start| and |end| for the source buffer |
| // associated with |id|. |
| void Remove(const std::string& id, base::TimeDelta start, |
| base::TimeDelta end); |
| |
| // Returns the current presentation duration. |
| double GetDuration(); |
| double GetDuration_Locked(); |
| |
| // Notifies the demuxer that the duration of the media has changed to |
| // |duration|. |
| void SetDuration(double duration); |
| |
| // Sets a time |offset| to be applied to subsequent buffers appended to the |
| // source buffer associated with |id|. Returns true if the offset is set |
| // properly, false if the offset cannot be applied because we're in the |
| // middle of parsing a media segment. |
| bool SetTimestampOffset(const std::string& id, base::TimeDelta offset); |
| |
| // Called to signal changes in the "end of stream" |
| // state. UnmarkEndOfStream() must not be called if a matching |
| // MarkEndOfStream() has not come before it. |
| void MarkEndOfStream(PipelineStatus status); |
| void UnmarkEndOfStream(); |
| |
| // Set the append window start and end values for the source buffer |
| // associated with |id|. |
| void SetAppendWindowStart(const std::string& id, base::TimeDelta start); |
| void SetAppendWindowEnd(const std::string& id, base::TimeDelta end); |
| |
| void Shutdown(); |
| |
| void SetMemoryLimitsForTesting(int memory_limit); |
| |
| // Returns the ranges representing the buffered data in the demuxer. |
| // TODO(wolenetz): Remove this method once MediaSourceDelegate no longer |
| // requires it for doing hack browser seeks to I-frame on Android. See |
| // http://crbug.com/304234. |
| Ranges<base::TimeDelta> GetBufferedRanges() const; |
| |
| private: |
| enum State { |
| WAITING_FOR_INIT, |
| INITIALIZING, |
| INITIALIZED, |
| ENDED, |
| PARSE_ERROR, |
| SHUTDOWN, |
| }; |
| |
| void ChangeState_Locked(State new_state); |
| |
| // Reports an error and puts the demuxer in a state where it won't accept more |
| // data. |
| void ReportError_Locked(PipelineStatus error); |
| |
| // Returns true if any stream has seeked to a time without buffered data. |
| bool IsSeekWaitingForData_Locked() const; |
| |
| // Returns true if all streams can successfully call EndOfStream, |
| // false if any can not. |
| bool CanEndOfStream_Locked() const; |
| |
| // SourceState callbacks. |
| void OnSourceInitDone(bool success, base::TimeDelta duration); |
| |
| // Creates a DemuxerStream for the specified |type|. |
| // Returns a new ChunkDemuxerStream instance if a stream of this type |
| // has not been created before. Returns NULL otherwise. |
| ChunkDemuxerStream* CreateDemuxerStream(DemuxerStream::Type type); |
| |
| bool OnTextBuffers(TextTrack* text_track, |
| const StreamParser::BufferQueue& buffers); |
| void OnNewMediaSegment(const std::string& source_id, |
| base::TimeDelta start_timestamp); |
| |
| // Computes the intersection between the video & audio |
| // buffered ranges. |
| Ranges<base::TimeDelta> ComputeIntersection() const; |
| |
| // Applies |time_offset| to the timestamps of |buffers|. |
| void AdjustBufferTimestamps(const StreamParser::BufferQueue& buffers, |
| base::TimeDelta timestamp_offset); |
| |
| // Returns true if |source_id| is valid, false otherwise. |
| bool IsValidId(const std::string& source_id) const; |
| |
| // Increases |duration_| if |last_appended_buffer_timestamp| exceeds the |
| // current |duration_|. The |duration_| is set to the end buffered timestamp |
| // of |stream|. |
| void IncreaseDurationIfNecessary( |
| base::TimeDelta last_appended_buffer_timestamp, |
| ChunkDemuxerStream* stream); |
| |
| // Decreases |duration_| if the buffered region is less than |duration_| when |
| // EndOfStream() is called. |
| void DecreaseDurationIfNecessary(); |
| |
| // Sets |duration_| to |new_duration|, sets |user_specified_duration_| to -1 |
| // and notifies |host_|. |
| void UpdateDuration(base::TimeDelta new_duration); |
| |
| // Returns the ranges representing the buffered data in the demuxer. |
| Ranges<base::TimeDelta> GetBufferedRanges_Locked() const; |
| |
| // Start returning data on all DemuxerStreams. |
| void StartReturningData(); |
| |
| // Aborts pending reads on all DemuxerStreams. |
| void AbortPendingReads(); |
| |
| // Completes any pending reads if it is possible to do so. |
| void CompletePendingReadsIfPossible(); |
| |
| // Seeks all SourceBufferStreams to |seek_time|. |
| void SeekAllSources(base::TimeDelta seek_time); |
| |
| mutable base::Lock lock_; |
| State state_; |
| bool cancel_next_seek_; |
| |
| DemuxerHost* host_; |
| base::Closure open_cb_; |
| NeedKeyCB need_key_cb_; |
| AddTextTrackCB add_text_track_cb_; |
| // Callback used to report error strings that can help the web developer |
| // figure out what is wrong with the content. |
| LogCB log_cb_; |
| |
| PipelineStatusCB init_cb_; |
| // Callback to execute upon seek completion. |
| // TODO(wolenetz/acolwell): Protect against possible double-locking by first |
| // releasing |lock_| before executing this callback. See |
| // http://crbug.com/308226 |
| PipelineStatusCB seek_cb_; |
| |
| scoped_ptr<ChunkDemuxerStream> audio_; |
| scoped_ptr<ChunkDemuxerStream> video_; |
| |
| // Keeps |audio_| alive when audio has been disabled. |
| scoped_ptr<ChunkDemuxerStream> disabled_audio_; |
| |
| base::TimeDelta duration_; |
| |
| // The duration passed to the last SetDuration(). If |
| // SetDuration() is never called or an AppendData() call or |
| // a EndOfStream() call changes |duration_|, then this |
| // variable is set to < 0 to indicate that the |duration_| represents |
| // the actual duration instead of a user specified value. |
| double user_specified_duration_; |
| |
| typedef std::map<std::string, SourceState*> SourceStateMap; |
| SourceStateMap source_state_map_; |
| |
| // Used to ensure that (1) config data matches the type and codec provided in |
| // AddId(), (2) only 1 audio and 1 video sources are added, and (3) ids may be |
| // removed with RemoveID() but can not be re-added (yet). |
| std::string source_id_audio_; |
| std::string source_id_video_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_FILTERS_CHUNK_DEMUXER_H_ |