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1 // Copyright 2015 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. | |
4 | |
5 #ifndef MEDIA_FILTERS_LIBWEBM_MUXER_H_ | |
6 #define MEDIA_FILTERS_LIBWEBM_MUXER_H_ | |
7 | |
8 #include <set> | |
9 | |
10 #include "base/callback.h" | |
11 #include "base/gtest_prod_util.h" | |
12 #include "base/numerics/safe_math.h" | |
13 #include "base/threading/thread_checker.h" | |
14 #include "base/time/time.h" | |
15 #include "media/base/media_export.h" | |
16 #include "third_party/libwebm/source/mkvmuxer.hpp" | |
17 #include "ui/gfx/geometry/size.h" | |
18 | |
19 namespace media { | |
20 | |
21 // Adapter class to manage a WebM container, a simplified version of a Matroska | |
22 // container [1], composed of an EBML header, and a single Segment including | |
23 // at least a Track Section and a number of SimpleBlocks each containing a | |
24 // single encoded video frame. WebM container has no Trailer. | |
25 // Clients will push encoded VPx video frames one by one via OnEncodedVideo() | |
26 // with indication of the Track they belong to, and libwebm will eventually ping | |
27 // the WriteDataCB passed on contructor with the wrapped encoded data. All | |
28 // operations must happen in a single thread, where WebmMuxer is created and | |
29 // destroyed. | |
30 // [1] http://www.matroska.org/technical/specs/index.html | |
31 // TODO(mcasas): Add support for Audio muxing. | |
32 class MEDIA_EXPORT WebmMuxer : public mkvmuxer::IMkvWriter { | |
33 public: | |
34 // Callback to be called when WebmMuxer is ready to write a chunk of data, | |
35 // either any file header or a SingleBlock. The chunk is described as a byte | |
36 // array and a byte length. | |
37 typedef base::Callback<void(const char*, size_t)> WriteDataCB; | |
38 | |
39 explicit WebmMuxer(const WriteDataCB& write_data_callback); | |
40 ~WebmMuxer() override; | |
41 | |
42 // Creates and adds a new video track. Called before receiving the first | |
43 // frame of a given Track, adds |frame_size| and |frame_rate| to the Segment | |
44 // info, although individual frames passed to OnEncodedVideo() can have any | |
45 // frame size. | |
46 void AddVideoTrack(uint32_t track_number, | |
47 const gfx::Size& frame_size, | |
48 double frame_rate); | |
49 | |
50 // Adds a frame with |encoded_data.data()| to WebM Segment. |track_number| is | |
51 // a caller-side identifier and must have been AddVideoTrack()ed before. | |
52 // |timedelta| is a delta from UTC/WebM Epoch, 2001-01-01 00:00:00. | |
miu
2015/07/18 00:29:39
Don't burden the client with the WebM epoch calcul
mcasas
2015/07/20 16:25:15
Done.
| |
53 void OnEncodedVideo(uint32_t track_number, | |
54 const std::string& encoded_data, | |
55 const base::TimeDelta& timedelta, | |
miu
2015/07/18 00:29:39
naming: Forgot to mention last round: s/timedelta/
mcasas
2015/07/20 16:25:15
Done.
| |
56 bool keyframe); | |
57 | |
58 private: | |
59 friend class WebmMuxerTest; | |
60 FRIEND_TEST_ALL_PREFIXES(WebmMuxerTest, AddVideoTrack); | |
61 FRIEND_TEST_ALL_PREFIXES(WebmMuxerTest, Write); | |
62 FRIEND_TEST_ALL_PREFIXES(WebmMuxerTest, OnEncodedVideoEmptyAndNormalFrames); | |
63 FRIEND_TEST_ALL_PREFIXES(WebmMuxerTest, OnEncodedVideoNormalFrames); | |
64 | |
65 // IMkvWriter interface. | |
66 mkvmuxer::int32 Write(const void* buf, mkvmuxer::uint32 len) override; | |
67 mkvmuxer::int64 Position() const override; | |
68 mkvmuxer::int32 Position(mkvmuxer::int64 position) override; | |
69 bool Seekable() const override; | |
70 void ElementStartNotify(mkvmuxer::uint64 element_id, | |
71 mkvmuxer::int64 position) override; | |
72 | |
73 // Used to DCHECK that we are called on the correct thread. | |
74 base::ThreadChecker thread_checker_; | |
75 | |
76 // Callback to dump written data as being called by libwebm. | |
77 const WriteDataCB write_data_callback_; | |
78 | |
79 // Rolling counter of the position in bytes of the written goo. | |
80 base::CheckedNumeric<mkvmuxer::int64> position_; | |
81 | |
82 // Owned pointer to the MkvMuxer active element. | |
83 const scoped_ptr<mkvmuxer::Segment> segment_; | |
84 | |
85 DISALLOW_COPY_AND_ASSIGN(WebmMuxer); | |
86 }; | |
87 | |
88 } // namespace media | |
89 | |
90 #endif // MEDIA_FILTERS_LIBWEBM_MUXER_H_ | |
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