1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef MEDIA_FILTERS_CHUNK_DEMUXER_H_
6 #define MEDIA_FILTERS_CHUNK_DEMUXER_H_
14 #include "base/synchronization/lock.h"
15 #include "media/base/byte_queue.h"
16 #include "media/base/demuxer.h"
17 #include "media/base/ranges.h"
18 #include "media/base/stream_parser.h"
19 #include "media/filters/source_buffer_stream.h"
23 class FFmpegURLProtocol;
26 class MEDIA_EXPORT ChunkDemuxerStream : public DemuxerStream {
28 typedef std::deque<scoped_refptr<StreamParserBuffer> > BufferQueue;
30 explicit ChunkDemuxerStream(Type type, bool splice_frames_enabled);
31 virtual ~ChunkDemuxerStream();
33 // ChunkDemuxerStream control methods.
34 void StartReturningData();
36 void CompletePendingReadIfPossible();
39 // SourceBufferStream manipulation methods.
40 void Seek(base::TimeDelta time);
41 bool IsSeekWaitingForData() const;
43 // Add buffers to this stream. Buffers are stored in SourceBufferStreams,
44 // which handle ordering and overlap resolution.
45 // Returns true if buffers were successfully added.
46 bool Append(const StreamParser::BufferQueue& buffers);
48 // Removes buffers between |start| and |end| according to the steps
49 // in the "Coded Frame Removal Algorithm" in the Media Source
51 // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#sourcebuffer-coded-frame-removal
53 // |duration| is the current duration of the presentation. It is
54 // required by the computation outlined in the spec.
55 void Remove(base::TimeDelta start, base::TimeDelta end,
56 base::TimeDelta duration);
58 // Signal to the stream that duration has changed to |duration|.
59 void OnSetDuration(base::TimeDelta duration);
61 // Returns the range of buffered data in this stream, capped at |duration|.
62 Ranges<base::TimeDelta> GetBufferedRanges(base::TimeDelta duration) const;
64 // Returns the duration of the buffered data.
65 // Returns base::TimeDelta() if the stream has no buffered data.
66 base::TimeDelta GetBufferedDuration() const;
68 // Signal to the stream that buffers handed in through subsequent calls to
69 // Append() belong to a media segment that starts at |start_timestamp|.
70 void OnNewMediaSegment(base::TimeDelta start_timestamp);
72 // Called when midstream config updates occur.
73 // Returns true if the new config is accepted.
74 // Returns false if the new config should trigger an error.
75 bool UpdateAudioConfig(const AudioDecoderConfig& config, const LogCB& log_cb);
76 bool UpdateVideoConfig(const VideoDecoderConfig& config, const LogCB& log_cb);
77 void UpdateTextConfig(const TextTrackConfig& config, const LogCB& log_cb);
79 void MarkEndOfStream();
80 void UnmarkEndOfStream();
82 // DemuxerStream methods.
83 virtual void Read(const ReadCB& read_cb) OVERRIDE;
84 virtual Type type() OVERRIDE;
85 virtual void EnableBitstreamConverter() OVERRIDE;
86 virtual AudioDecoderConfig audio_decoder_config() OVERRIDE;
87 virtual VideoDecoderConfig video_decoder_config() OVERRIDE;
88 virtual bool SupportsConfigChanges() OVERRIDE;
90 // Returns the text track configuration. It is an error to call this method
92 TextTrackConfig text_track_config();
94 // Sets the memory limit, in bytes, on the SourceBufferStream.
95 void set_memory_limit_for_testing(int memory_limit) {
96 stream_->set_memory_limit_for_testing(memory_limit);
99 bool supports_partial_append_window_trimming() const {
100 return partial_append_window_trimming_enabled_;
106 RETURNING_DATA_FOR_READS,
107 RETURNING_ABORT_FOR_READS,
111 // Assigns |state_| to |state|
112 void ChangeState_Locked(State state);
114 void CompletePendingReadIfPossible_Locked();
116 // Specifies the type of the stream.
119 scoped_ptr<SourceBufferStream> stream_;
121 mutable base::Lock lock_;
124 bool splice_frames_enabled_;
125 bool partial_append_window_trimming_enabled_;
127 DISALLOW_IMPLICIT_CONSTRUCTORS(ChunkDemuxerStream);
130 // Demuxer implementation that allows chunks of media data to be passed
131 // from JavaScript to the media stack.
132 class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
135 kOk, // ID added w/o error.
136 kNotSupported, // Type specified is not supported.
137 kReachedIdLimit, // Reached ID limit. We can't handle any more IDs.
140 // |open_cb| Run when Initialize() is called to signal that the demuxer
141 // is ready to receive media data via AppenData().
142 // |need_key_cb| Run when the demuxer determines that an encryption key is
143 // needed to decrypt the content.
144 // |enable_text| Process inband text tracks in the normal way when true,
145 // otherwise ignore them.
146 // |log_cb| Run when parsing error messages need to be logged to the error
148 // |splice_frames_enabled| Indicates that it's okay to generate splice frames
149 // per the MSE specification. Renderers must understand DecoderBuffer's
150 // splice_timestamp() field.
151 ChunkDemuxer(const base::Closure& open_cb,
152 const NeedKeyCB& need_key_cb,
154 bool splice_frames_enabled);
155 virtual ~ChunkDemuxer();
157 // Demuxer implementation.
158 virtual void Initialize(DemuxerHost* host,
159 const PipelineStatusCB& cb,
160 bool enable_text_tracks) OVERRIDE;
161 virtual void Stop(const base::Closure& callback) OVERRIDE;
162 virtual void Seek(base::TimeDelta time, const PipelineStatusCB& cb) OVERRIDE;
163 virtual DemuxerStream* GetStream(DemuxerStream::Type type) OVERRIDE;
164 virtual base::TimeDelta GetStartTime() const OVERRIDE;
165 virtual base::Time GetTimelineOffset() const OVERRIDE;
166 virtual Liveness GetLiveness() const OVERRIDE;
168 // Methods used by an external object to control this demuxer.
170 // Indicates that a new Seek() call is on its way. Any pending Reads on the
171 // DemuxerStream objects should be aborted immediately inside this call and
172 // future Read calls should return kAborted until the Seek() call occurs.
173 // This method MUST ALWAYS be called before Seek() is called to signal that
174 // the next Seek() call represents the seek point we actually want to return
176 // |seek_time| - The presentation timestamp for the seek that triggered this
177 // call. It represents the most recent position the caller is trying to seek
179 void StartWaitingForSeek(base::TimeDelta seek_time);
181 // Indicates that a Seek() call is on its way, but another seek has been
182 // requested that will override the impending Seek() call. Any pending Reads
183 // on the DemuxerStream objects should be aborted immediately inside this call
184 // and future Read calls should return kAborted until the next
185 // StartWaitingForSeek() call. This method also arranges for the next Seek()
186 // call received before a StartWaitingForSeek() call to immediately call its
187 // callback without waiting for any data.
188 // |seek_time| - The presentation timestamp for the seek request that
189 // triggered this call. It represents the most recent position the caller is
190 // trying to seek to.
191 void CancelPendingSeek(base::TimeDelta seek_time);
193 // Registers a new |id| to use for AppendData() calls. |type| indicates
194 // the MIME type for the data that we intend to append for this ID.
195 // kOk is returned if the demuxer has enough resources to support another ID
196 // and supports the format indicated by |type|.
197 // kNotSupported is returned if |type| is not a supported format.
198 // kReachedIdLimit is returned if the demuxer cannot handle another ID right
200 Status AddId(const std::string& id, const std::string& type,
201 std::vector<std::string>& codecs);
203 // Removed an ID & associated resources that were previously added with
205 void RemoveId(const std::string& id);
207 // Gets the currently buffered ranges for the specified ID.
208 Ranges<base::TimeDelta> GetBufferedRanges(const std::string& id) const;
210 // Appends media data to the source buffer associated with |id|, applying
211 // and possibly updating |*timestamp_offset| during coded frame processing.
212 // |append_window_start| and |append_window_end| correspond to the MSE spec's
213 // similarly named source buffer attributes that are used in coded frame
215 void AppendData(const std::string& id, const uint8* data, size_t length,
216 base::TimeDelta append_window_start,
217 base::TimeDelta append_window_end,
218 base::TimeDelta* timestamp_offset);
220 // Aborts parsing the current segment and reset the parser to a state where
221 // it can accept a new segment.
222 // Some pending frames can be emitted during that process. These frames are
223 // applied |timestamp_offset|.
224 void Abort(const std::string& id,
225 base::TimeDelta append_window_start,
226 base::TimeDelta append_window_end,
227 base::TimeDelta* timestamp_offset);
229 // Remove buffers between |start| and |end| for the source buffer
230 // associated with |id|.
231 void Remove(const std::string& id, base::TimeDelta start,
232 base::TimeDelta end);
234 // Returns the current presentation duration.
235 double GetDuration();
236 double GetDuration_Locked();
238 // Notifies the demuxer that the duration of the media has changed to
240 void SetDuration(double duration);
242 // Returns true if the source buffer associated with |id| is currently parsing
243 // a media segment, or false otherwise.
244 bool IsParsingMediaSegment(const std::string& id);
246 // Set the append mode to be applied to subsequent buffers appended to the
247 // source buffer associated with |id|. If |sequence_mode| is true, caller
248 // is requesting "sequence" mode. Otherwise, caller is requesting "segments"
250 void SetSequenceMode(const std::string& id, bool sequence_mode);
252 // Signals the coded frame processor for the source buffer associated with
253 // |id| to update its group start timestamp to be |timestamp_offset| if it is
254 // in sequence append mode.
255 void SetGroupStartTimestampIfInSequenceMode(const std::string& id,
256 base::TimeDelta timestamp_offset);
258 // Called to signal changes in the "end of stream"
259 // state. UnmarkEndOfStream() must not be called if a matching
260 // MarkEndOfStream() has not come before it.
261 void MarkEndOfStream(PipelineStatus status);
262 void UnmarkEndOfStream();
266 // Sets the memory limit on each stream. |memory_limit| is the
267 // maximum number of bytes each stream is allowed to hold in its buffer.
268 void SetMemoryLimitsForTesting(int memory_limit);
270 // Returns the ranges representing the buffered data in the demuxer.
271 // TODO(wolenetz): Remove this method once MediaSourceDelegate no longer
272 // requires it for doing hack browser seeks to I-frame on Android. See
273 // http://crbug.com/304234.
274 Ranges<base::TimeDelta> GetBufferedRanges() const;
286 void ChangeState_Locked(State new_state);
288 // Reports an error and puts the demuxer in a state where it won't accept more
290 void ReportError_Locked(PipelineStatus error);
292 // Returns true if any stream has seeked to a time without buffered data.
293 bool IsSeekWaitingForData_Locked() const;
295 // Returns true if all streams can successfully call EndOfStream,
296 // false if any can not.
297 bool CanEndOfStream_Locked() const;
299 // SourceState callbacks.
300 void OnSourceInitDone(bool success,
301 const StreamParser::InitParameters& params);
303 // Creates a DemuxerStream for the specified |type|.
304 // Returns a new ChunkDemuxerStream instance if a stream of this type
305 // has not been created before. Returns NULL otherwise.
306 ChunkDemuxerStream* CreateDemuxerStream(DemuxerStream::Type type);
308 void OnNewTextTrack(ChunkDemuxerStream* text_stream,
309 const TextTrackConfig& config);
311 // Returns true if |source_id| is valid, false otherwise.
312 bool IsValidId(const std::string& source_id) const;
314 // Increases |duration_| to |new_duration|, if |new_duration| is higher.
315 void IncreaseDurationIfNecessary(base::TimeDelta new_duration);
317 // Decreases |duration_| if the buffered region is less than |duration_| when
318 // EndOfStream() is called.
319 void DecreaseDurationIfNecessary();
321 // Sets |duration_| to |new_duration|, sets |user_specified_duration_| to -1
322 // and notifies |host_|.
323 void UpdateDuration(base::TimeDelta new_duration);
325 // Returns the ranges representing the buffered data in the demuxer.
326 Ranges<base::TimeDelta> GetBufferedRanges_Locked() const;
328 // Start returning data on all DemuxerStreams.
329 void StartReturningData();
331 // Aborts pending reads on all DemuxerStreams.
332 void AbortPendingReads();
334 // Completes any pending reads if it is possible to do so.
335 void CompletePendingReadsIfPossible();
337 // Seeks all SourceBufferStreams to |seek_time|.
338 void SeekAllSources(base::TimeDelta seek_time);
340 // Shuts down all DemuxerStreams by calling Shutdown() on
341 // all objects in |source_state_map_|.
342 void ShutdownAllStreams();
344 mutable base::Lock lock_;
346 bool cancel_next_seek_;
349 base::Closure open_cb_;
350 NeedKeyCB need_key_cb_;
352 // Callback used to report error strings that can help the web developer
353 // figure out what is wrong with the content.
356 PipelineStatusCB init_cb_;
357 // Callback to execute upon seek completion.
358 // TODO(wolenetz/acolwell): Protect against possible double-locking by first
359 // releasing |lock_| before executing this callback. See
360 // http://crbug.com/308226
361 PipelineStatusCB seek_cb_;
363 scoped_ptr<ChunkDemuxerStream> audio_;
364 scoped_ptr<ChunkDemuxerStream> video_;
366 base::TimeDelta duration_;
368 // The duration passed to the last SetDuration(). If
369 // SetDuration() is never called or an AppendData() call or
370 // a EndOfStream() call changes |duration_|, then this
371 // variable is set to < 0 to indicate that the |duration_| represents
372 // the actual duration instead of a user specified value.
373 double user_specified_duration_;
375 base::Time timeline_offset_;
378 typedef std::map<std::string, SourceState*> SourceStateMap;
379 SourceStateMap source_state_map_;
381 // Used to ensure that (1) config data matches the type and codec provided in
382 // AddId(), (2) only 1 audio and 1 video sources are added, and (3) ids may be
383 // removed with RemoveID() but can not be re-added (yet).
384 std::string source_id_audio_;
385 std::string source_id_video_;
387 // Indicates that splice frame generation is enabled.
388 const bool splice_frames_enabled_;
390 DISALLOW_COPY_AND_ASSIGN(ChunkDemuxer);
395 #endif // MEDIA_FILTERS_CHUNK_DEMUXER_H_