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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/capture/webm_muxer.h" | |
6 | |
7 #include <limits> | |
8 | |
9 namespace media { | |
10 | |
11 WebmMuxer::WebmMuxer(const WriteDataCB& write_data_callback) | |
12 : write_data_callback_(write_data_callback), | |
13 position_(0) { | |
14 DCHECK(thread_checker_.CalledOnValidThread()); | |
15 segment_.Init(this); | |
16 segment_.set_mode(mkvmuxer::Segment::kLive); | |
17 segment_.OutputCues(false); | |
18 | |
19 mkvmuxer::SegmentInfo* const info = segment_.GetSegmentInfo(); | |
20 info->set_writing_app("Chrome"); | |
21 info->set_muxing_app("Chrome"); | |
22 } | |
23 | |
24 WebmMuxer::~WebmMuxer() { | |
25 DCHECK(thread_checker_.CalledOnValidThread()); | |
26 segment_.Finalize(); | |
27 } | |
28 | |
29 mkvmuxer::uint64 WebmMuxer::AddVideoTrack(const gfx::Size& frame_size, | |
DaleCurtis
2015/07/20 20:23:07
Since this is the Chrome side interface, can we ju
mcasas
2015/07/21 12:56:20
Done.
| |
30 double frame_rate) { | |
31 DCHECK(thread_checker_.CalledOnValidThread()); | |
32 | |
33 const mkvmuxer::uint64 track_index = | |
34 segment_.AddVideoTrack(frame_size.width(), frame_size.height(), 0); | |
35 | |
36 mkvmuxer::VideoTrack* const video_track = | |
37 reinterpret_cast<mkvmuxer::VideoTrack*>( | |
38 segment_.GetTrackByNumber(track_index)); | |
39 DCHECK(video_track); | |
40 video_track->set_codec_id(mkvmuxer::Tracks::kVp8CodecId); | |
41 DCHECK_EQ(video_track->crop_right(), 0ull); | |
42 DCHECK_EQ(video_track->crop_left(), 0ull); | |
43 DCHECK_EQ(video_track->crop_top(), 0ull); | |
44 DCHECK_EQ(video_track->crop_bottom(), 0ull); | |
45 | |
46 video_track->set_frame_rate(frame_rate); | |
47 video_track->set_default_duration(base::Time::kMicrosecondsPerSecond / | |
48 frame_rate); | |
49 // Segment's timestamps should be in milliseconds, dcheck it. See | |
50 // http://www.webmproject.org/docs/container/#muxer-guidelines | |
51 DCHECK_EQ(segment_.GetSegmentInfo()->timecode_scale(), 1000000ull); | |
52 | |
53 return track_index; | |
54 } | |
55 | |
56 void WebmMuxer::OnEncodedVideo(mkvmuxer::uint64 track_number, | |
57 const std::string& encoded_data, | |
DaleCurtis
2015/07/20 20:23:07
Do you want std::string& here? Should you instead
mcasas
2015/07/21 12:56:20
Hmm at this point I'm happy with std::string&, rea
DaleCurtis
2015/07/21 16:52:30
I didn't realize that about the vp8 encode api, so
mcasas
2015/07/21 19:46:59
Acknowledged.
Tom Finegan
2015/07/21 21:19:09
By default, this is true, but you can make the lib
| |
58 const base::TimeDelta& timestamp, | |
59 bool keyframe) { | |
60 DCHECK(thread_checker_.CalledOnValidThread()); | |
61 // |track_number|, a caller-side identifier, cannot be zero (!), see | |
62 // http://www.matroska.org/technical/specs/index.html#Tracks | |
63 DCHECK_GT(track_number, 0u); | |
64 DCHECK(segment_.GetTrackByNumber(track_number)); | |
65 | |
66 segment_.AddFrame(reinterpret_cast<const uint8_t*>(encoded_data.data()), | |
67 encoded_data.size(), | |
68 track_number, | |
69 timestamp.InMilliseconds(), | |
70 keyframe); | |
71 } | |
72 | |
73 mkvmuxer::int32 WebmMuxer::Write(const void* buf, mkvmuxer::uint32 len) { | |
74 DCHECK(thread_checker_.CalledOnValidThread()); | |
75 write_data_callback_.Run(static_cast<const char*>(buf), len); | |
76 position_ += len; | |
77 return 0; | |
78 } | |
79 | |
80 mkvmuxer::int64 WebmMuxer::Position() const { | |
81 return position_.ValueOrDie(); | |
82 } | |
83 | |
84 mkvmuxer::int32 WebmMuxer::Position(mkvmuxer::int64 position) { | |
85 // The stream is not Seekable() so indicate we cannot set the position. | |
86 return -1; | |
87 } | |
88 | |
89 bool WebmMuxer::Seekable() const { | |
90 return false; | |
91 } | |
92 | |
93 void WebmMuxer::ElementStartNotify(mkvmuxer::uint64 element_id, | |
94 mkvmuxer::int64 position) { | |
95 // This method gets pinged before items are sent to |write_data_callback_|. | |
96 DCHECK_GE(position, position_.ValueOrDefault(0)) | |
97 << "Can't go back in a Live Mkv stream."; | |
98 } | |
99 | |
100 } // namespace media | |
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