Index: media/filters/webm_muxer.cc |
diff --git a/media/filters/webm_muxer.cc b/media/filters/webm_muxer.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..3e00cdde45776584f80a1f9612083458d90472d9 |
--- /dev/null |
+++ b/media/filters/webm_muxer.cc |
@@ -0,0 +1,122 @@ |
+// Copyright 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "media/filters/webm_muxer.h" |
+ |
+#include "base/time/time.h" |
+ |
+namespace media { |
+ |
+WebmMuxer::WebmMuxer(const WriteDataCB& write_data_callback) |
+ : write_data_callback_(write_data_callback), |
+ time_start_(base::TimeTicks::Now()), |
+ position_(0), |
+ segment_(new mkvmuxer::Segment()) { |
+ DVLOG(3) << __FUNCTION__; |
+ DCHECK(thread_checker_.CalledOnValidThread()); |
+ segment_->Init(this); |
+ segment_->set_mode(mkvmuxer::Segment::kLive); |
+ segment_->OutputCues(false); |
+ |
+ mkvmuxer::SegmentInfo* const info = segment_->GetSegmentInfo(); |
+ info->set_writing_app("Chrome"); |
+ info->set_muxing_app("Chrome"); |
+ // SegmentInfo::set_date_utc() is nanoseconds from 0:00 on January 1st, 2001. |
+ base::Time utc_epoch; |
+ base::Time::FromUTCString("1 Jan 2001 00:00:00.000", &utc_epoch); |
miu
2015/07/16 01:46:25
BTW--The media/PRESUBMIT.py script may cause commi
mcasas
2015/07/17 17:45:07
Done.
|
+ DCHECK(!utc_epoch.is_null()); |
+ info->set_date_utc((base::Time::Now() - utc_epoch).InMicroseconds() * |
+ base::Time::kNanosecondsPerMicrosecond); |
+} |
+ |
+WebmMuxer::~WebmMuxer() { |
+ DCHECK(thread_checker_.CalledOnValidThread()); |
+ DVLOG(3) << __FUNCTION__; |
+ segment_->Finalize(); |
+} |
+ |
+void WebmMuxer::OnEncodedVideo(int track_index, |
+ const std::string& encoded_data, |
+ const base::TimeTicks& timestamp, |
+ bool keyframe, |
+ const gfx::Size& frame_size, |
+ double frame_rate) { |
+ DVLOG(3) << __FUNCTION__; |
+ DCHECK(thread_checker_.CalledOnValidThread()); |
+ |
+ const int index_starting_from_one = track_index + 1; |
+ // Add the video track the first time we see it. |
+ if (track_indexes_.find(index_starting_from_one) == track_indexes_.end()) { |
+ AddVideoTrack(frame_size, frame_rate, index_starting_from_one); |
+ track_indexes_.insert(index_starting_from_one); |
+ } |
+ |
+ // Depending on segment->GetSegmentInfo()->timecode_scale(), timestamps are in |
+ // milliseconds or microseconds. By default in milliseconds. |
+ segment_->AddFrame(reinterpret_cast<const uint8_t*>(encoded_data.data()), |
+ encoded_data.size(), |
+ index_starting_from_one, |
+ (timestamp - time_start_).InMilliseconds(), |
miu
2015/07/16 01:46:25
InMicroseconds() please. See comment below.
mcasas
2015/07/17 17:45:07
Done.
|
+ keyframe); |
+} |
+ |
+bool WebmMuxer::AddVideoTrack(const gfx::Size& frame_size, |
+ double frame_rate, |
+ int track_index_starting_from_one) { |
+ DVLOG(3) << "AddVideoTrack: " << frame_size.ToString() << "@" |
+ << frame_rate << "fps, index: " << track_index_starting_from_one; |
+ DCHECK(thread_checker_.CalledOnValidThread()); |
+ |
+ segment_->AddVideoTrack(frame_size.width(), frame_size.height(), |
+ track_index_starting_from_one); |
+ mkvmuxer::VideoTrack* const video_track = |
+ reinterpret_cast<mkvmuxer::VideoTrack*>( |
+ segment_->GetTrackByNumber(track_index_starting_from_one)); |
+ DCHECK(video_track); |
+ video_track->set_codec_id(mkvmuxer::Tracks::kVp8CodecId); |
+ DCHECK_EQ(video_track->crop_right(), 0ull); |
+ DCHECK_EQ(video_track->crop_left(), 0ull); |
+ DCHECK_EQ(video_track->crop_top(), 0ull); |
+ DCHECK_EQ(video_track->crop_bottom(), 0ull); |
+ |
+ video_track->set_frame_rate(frame_rate); |
+ // Depending on segment->GetSegmentInfo()->timecode_scale(), timestamps are |
+ // interpreted as milliseconds, microseconds, etc. |
+ // By default it's is milliseconds, but DCHECK that. |
miu
2015/07/16 01:46:25
BTW--One of my pet peeves is truncating media time
mcasas
2015/07/17 17:45:07
Done.
|
+ DCHECK_EQ(segment_->GetSegmentInfo()->timecode_scale(), 1000000ull); |
+ video_track->set_default_duration(base::Time::kMillisecondsPerSecond / |
+ frame_rate); |
+ |
+ return true; |
+} |
+ |
+mkvmuxer::int32 WebmMuxer::Write(const void* buf, mkvmuxer::uint32 len) { |
+ DVLOG(3) << __FUNCTION__ << " length=" << len; |
+ DCHECK(thread_checker_.CalledOnValidThread()); |
+ write_data_callback_.Run(static_cast<const char*>(buf), len); |
miu
2015/07/16 01:46:25
Potential bug: If |len| is greater than 2^31-1, th
mcasas
2015/07/17 17:45:07
Made them size_t in WriteDataCB etc.
|
+ position_ += len; |
+ return 0; |
+} |
+ |
+mkvmuxer::int64 WebmMuxer::Position() const { |
+ return position_.ValueOrDefault(0); |
miu
2015/07/16 01:46:25
Shouldn't this be ValueOrDie()? Also, there's an
mcasas
2015/07/17 17:45:07
Done.
|
+} |
+ |
+mkvmuxer::int32 WebmMuxer::Position(mkvmuxer::int64 position) { |
+ // The stream is not Seekable() so indicate we cannot set the position. |
+ return -1; |
+} |
+ |
+bool WebmMuxer::Seekable() const { |
+ return false; |
+} |
+ |
+void WebmMuxer::ElementStartNotify(mkvmuxer::uint64 element_id, |
+ mkvmuxer::int64 position) { |
+ // This method gets pinged before items are sent to |write_data_callback_|. |
+ DCHECK_GE(static_cast<uint64_t>(position), position_.ValueOrDefault(0)) |
+ << "Can't go back in a Live Mkv stream."; |
+} |
+ |
+} // namespace media |