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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // SourceBufferStream is a data structure that stores media Buffers in ranges. | 5 // SourceBufferStream is a data structure that stores media Buffers in ranges. |
6 // Buffers can be appended out of presentation order. Buffers are retrieved by | 6 // Buffers can be appended out of presentation order. Buffers are retrieved by |
7 // seeking to the desired start point and calling GetNextBuffer(). Buffers are | 7 // seeking to the desired start point and calling GetNextBuffer(). Buffers are |
8 // returned in sequential presentation order. | 8 // returned in sequential presentation order. |
9 | 9 |
10 #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ | 10 #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ |
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312 // See GetNextBuffer() for additional details. This method handles preroll | 312 // See GetNextBuffer() for additional details. This method handles preroll |
313 // frame processing. | 313 // frame processing. |
314 Status HandleNextBufferWithPreroll( | 314 Status HandleNextBufferWithPreroll( |
315 scoped_refptr<StreamParserBuffer>* out_buffer); | 315 scoped_refptr<StreamParserBuffer>* out_buffer); |
316 | 316 |
317 // See GetNextBuffer() for additional details. The internal method hands out | 317 // See GetNextBuffer() for additional details. The internal method hands out |
318 // single buffers from the |track_buffer_| and |selected_range_| without | 318 // single buffers from the |track_buffer_| and |selected_range_| without |
319 // additional processing for splice frame or preroll buffers. | 319 // additional processing for splice frame or preroll buffers. |
320 Status GetNextBufferInternal(scoped_refptr<StreamParserBuffer>* out_buffer); | 320 Status GetNextBufferInternal(scoped_refptr<StreamParserBuffer>* out_buffer); |
321 | 321 |
| 322 // If the next buffer's timestamp is significantly beyond the last output |
| 323 // buffer, and if we just exhausted |track_buffer_| on the previous read, this |
| 324 // method logs a warning to |media_log_| that there could be perceivable |
| 325 // delay. Apps can avoid this behavior by not overlap-appending buffers near |
| 326 // current playback position. |
| 327 void WarnIfTrackBufferExhaustionSkipsForward( |
| 328 const scoped_refptr<StreamParserBuffer>& next_buffer); |
| 329 |
322 // Called by PrepareRangesForNextAppend() before pruning overlapped buffers to | 330 // Called by PrepareRangesForNextAppend() before pruning overlapped buffers to |
323 // generate a splice frame with a small portion of the overlapped buffers. If | 331 // generate a splice frame with a small portion of the overlapped buffers. If |
324 // a splice frame is generated, the first buffer in |new_buffers| will have | 332 // a splice frame is generated, the first buffer in |new_buffers| will have |
325 // its timestamps, duration, and fade out preroll updated. | 333 // its timestamps, duration, and fade out preroll updated. |
326 void GenerateSpliceFrame(const BufferQueue& new_buffers); | 334 void GenerateSpliceFrame(const BufferQueue& new_buffers); |
327 | 335 |
328 // If |out_buffer| has splice buffers or preroll, sets |pending_buffer_| | 336 // If |out_buffer| has splice buffers or preroll, sets |pending_buffer_| |
329 // appropriately and returns true. Otherwise returns false. | 337 // appropriately and returns true. Otherwise returns false. |
330 bool SetPendingBuffer(scoped_refptr<StreamParserBuffer>* out_buffer); | 338 bool SetPendingBuffer(scoped_refptr<StreamParserBuffer>* out_buffer); |
331 | 339 |
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367 | 375 |
368 // Pointer to the seeked-to Range. This is the range from which | 376 // Pointer to the seeked-to Range. This is the range from which |
369 // GetNextBuffer() calls are fulfilled after the |track_buffer_| has been | 377 // GetNextBuffer() calls are fulfilled after the |track_buffer_| has been |
370 // emptied. | 378 // emptied. |
371 SourceBufferRange* selected_range_; | 379 SourceBufferRange* selected_range_; |
372 | 380 |
373 // Queue of the next buffers to be returned from calls to GetNextBuffer(). If | 381 // Queue of the next buffers to be returned from calls to GetNextBuffer(). If |
374 // |track_buffer_| is empty, return buffers from |selected_range_|. | 382 // |track_buffer_| is empty, return buffers from |selected_range_|. |
375 BufferQueue track_buffer_; | 383 BufferQueue track_buffer_; |
376 | 384 |
| 385 // If there has been no intervening Seek, this will be true if the last |
| 386 // emitted buffer emptied |track_buffer_|. |
| 387 bool just_exhausted_track_buffer_; |
| 388 |
377 // The start time of the current media segment being appended. | 389 // The start time of the current media segment being appended. |
378 DecodeTimestamp media_segment_start_time_; | 390 DecodeTimestamp media_segment_start_time_; |
379 | 391 |
380 // Points to the range containing the current media segment being appended. | 392 // Points to the range containing the current media segment being appended. |
381 RangeList::iterator range_for_next_append_; | 393 RangeList::iterator range_for_next_append_; |
382 | 394 |
383 // True when the next call to Append() begins a new media segment. | 395 // True when the next call to Append() begins a new media segment. |
384 bool new_media_segment_; | 396 bool new_media_segment_; |
385 | 397 |
386 // The timestamp of the last buffer appended to the media segment, set to | 398 // The timestamp of the last buffer appended to the media segment, set to |
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413 // Indicates which of the splice buffers in |splice_buffer_| should be | 425 // Indicates which of the splice buffers in |splice_buffer_| should be |
414 // handled out next. | 426 // handled out next. |
415 size_t splice_buffers_index_; | 427 size_t splice_buffers_index_; |
416 | 428 |
417 // Indicates that all buffers before |pending_buffer_| have been handed out. | 429 // Indicates that all buffers before |pending_buffer_| have been handed out. |
418 bool pending_buffers_complete_; | 430 bool pending_buffers_complete_; |
419 | 431 |
420 // Indicates that splice frame generation is enabled. | 432 // Indicates that splice frame generation is enabled. |
421 const bool splice_frames_enabled_; | 433 const bool splice_frames_enabled_; |
422 | 434 |
423 // To prevent log spam, count the number of splice generation warnings and | 435 // To prevent log spam, count the number of warnings and successes logged. |
424 // successes logged. | |
425 int num_splice_generation_warning_logs_; | 436 int num_splice_generation_warning_logs_; |
426 int num_splice_generation_success_logs_; | 437 int num_splice_generation_success_logs_; |
| 438 int num_track_buffer_gap_warning_logs_; |
427 | 439 |
428 DISALLOW_COPY_AND_ASSIGN(SourceBufferStream); | 440 DISALLOW_COPY_AND_ASSIGN(SourceBufferStream); |
429 }; | 441 }; |
430 | 442 |
431 } // namespace media | 443 } // namespace media |
432 | 444 |
433 #endif // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ | 445 #endif // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ |
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