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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 #include "media/filters/webm_muxer.h" | |
6 | |
7 #include "base/time/time.h" | |
8 | |
9 namespace media { | |
10 | |
11 WebmMuxer::WebmMuxer(const WriteDataCB& write_data_callback) | |
12 : write_data_callback_(write_data_callback), | |
13 time_start_(base::TimeTicks::Now()), | |
14 position_(0), | |
15 segment_(new mkvmuxer::Segment()) { | |
16 DVLOG(3) << __FUNCTION__; | |
17 DCHECK(thread_checker_.CalledOnValidThread()); | |
18 segment_->Init(this); | |
19 segment_->set_mode(mkvmuxer::Segment::kLive); | |
20 segment_->OutputCues(false); | |
21 | |
22 mkvmuxer::SegmentInfo* const info = segment_->GetSegmentInfo(); | |
23 info->set_writing_app("Chrome"); | |
24 info->set_muxing_app("Chrome"); | |
25 // SegmentInfo::set_date_utc() is nanoseconds from 0:00 on January 1st, 2001. | |
26 base::Time utc_epoch; | |
27 base::Time::FromUTCString("1 Jan 2001 00:00:00.000", &utc_epoch); | |
28 DCHECK(!utc_epoch.is_null()); | |
29 info->set_date_utc((base::Time::Now() - utc_epoch).InMicroseconds() * | |
30 base::Time::kNanosecondsPerMicrosecond); | |
31 } | |
32 | |
33 WebmMuxer::~WebmMuxer() { | |
34 DCHECK(thread_checker_.CalledOnValidThread()); | |
35 DVLOG(3) << __FUNCTION__; | |
36 segment_->Finalize(); | |
37 } | |
38 | |
39 void WebmMuxer::OnEncodedVideo(int track_index, | |
40 const std::string& encoded_data, | |
41 const base::TimeTicks& timestamp, | |
42 bool keyframe, | |
43 const gfx::Size& frame_size, | |
44 double frame_rate) { | |
45 DVLOG(3) << __FUNCTION__; | |
46 DCHECK(thread_checker_.CalledOnValidThread()); | |
47 | |
48 const int track_index_starting_from_one = track_index + 1; | |
49 | |
50 // Add the video track the first time we see it. | |
51 if (std::find(track_indexes_.begin(), track_indexes_.end(), | |
52 track_index_starting_from_one) == track_indexes_.end()) { | |
emircan
2015/07/13 18:14:40
Do you need to keep the order of incoming track_in
mcasas
2015/07/15 23:29:12
Done.
| |
53 AddVideoTrack(frame_size, frame_rate, track_index_starting_from_one); | |
54 track_indexes_.push_back(track_index_starting_from_one); | |
55 } | |
56 | |
57 // Depending on segment->GetSegmentInfo()->timecode_scale(), timestamps are in | |
58 // milliseconds or microseconds. By default in milliseconds. | |
59 segment_->AddFrame(reinterpret_cast<const uint8_t*>(encoded_data.data()), | |
60 encoded_data.size(), | |
61 track_index_starting_from_one, | |
62 (timestamp - time_start_).InMilliseconds(), | |
63 keyframe); | |
64 } | |
65 | |
66 bool WebmMuxer::AddVideoTrack(const gfx::Size& frame_size, | |
67 double frame_rate, | |
68 int track_index_starting_from_one) { | |
69 DVLOG(3) << "AddVideoTrack: " << frame_size.ToString() << "@" | |
70 << frame_rate << "fps, index: " << track_index_starting_from_one; | |
71 DCHECK(thread_checker_.CalledOnValidThread()); | |
72 | |
73 segment_->AddVideoTrack(frame_size.width(), frame_size.height(), | |
74 track_index_starting_from_one); | |
75 mkvmuxer::VideoTrack* const video_track = | |
76 reinterpret_cast<mkvmuxer::VideoTrack*>( | |
77 segment_->GetTrackByNumber(track_index_starting_from_one)); | |
78 DCHECK(video_track); | |
79 video_track->set_codec_id(mkvmuxer::Tracks::kVp8CodecId); | |
80 DCHECK_EQ(video_track->crop_right(), 0ull); | |
81 DCHECK_EQ(video_track->crop_left(), 0ull); | |
82 DCHECK_EQ(video_track->crop_top(), 0ull); | |
83 DCHECK_EQ(video_track->crop_bottom(), 0ull); | |
84 | |
85 video_track->set_frame_rate(frame_rate); | |
86 // Depending on segment->GetSegmentInfo()->timecode_scale(), timestamps are | |
87 // interpreted as milliseconds, microseconds, etc. | |
88 // By default it's is milliseconds, but DCHECK that. | |
89 DCHECK_EQ(segment_->GetSegmentInfo()->timecode_scale(), 1000000ull); | |
90 video_track->set_default_duration(base::Time::kMillisecondsPerSecond / | |
91 frame_rate); | |
92 | |
93 return true; | |
94 } | |
95 | |
96 mkvmuxer::int32 WebmMuxer::Write(const void* buf, mkvmuxer::uint32 len) { | |
97 DVLOG(3) << __FUNCTION__ << " length=" << len; | |
98 DCHECK(thread_checker_.CalledOnValidThread()); | |
99 // TODO(mcasas): Last parameter is |last_in_slice|, how to calculate it? | |
100 write_data_callback_.Run(static_cast<const char*>(buf), len, false); | |
101 position_ += len; | |
emircan
2015/07/13 18:14:40
base::CheckedNumeric would be useful here in case
mcasas
2015/07/15 23:29:12
Done.
| |
102 return 0; | |
103 } | |
104 | |
105 mkvmuxer::int64 WebmMuxer::Position() const { | |
106 return position_; | |
107 } | |
108 | |
109 mkvmuxer::int32 WebmMuxer::Position(mkvmuxer::int64 position) { | |
110 // The stream is not Seekable() so indicate we cannot set the position. | |
111 return -1; | |
112 } | |
113 | |
114 bool WebmMuxer::Seekable() const { | |
115 return false; | |
116 } | |
117 | |
118 void WebmMuxer::ElementStartNotify(mkvmuxer::uint64 element_id, | |
119 mkvmuxer::int64 position) { | |
120 // This method gets pinged before items are sent to |write_data_callback_|. | |
121 DCHECK_GE(position, position_) << "Can't go back in a Live Mkv stream."; | |
122 } | |
123 | |
124 } // namespace media | |
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