Add live mode detection in WebM MediaSource parser.

media/filters/ffmpeg_demuxer.cc

 // Copyright (c) 2012 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/ffmpeg_demuxer.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/base64.h"
@@ skipping 376 matching lines @@
     const scoped_refptr<MediaLog>& media_log)
     : host_(NULL),
       task_runner_(task_runner),
       blocking_thread_("FFmpegDemuxer"),
       pending_read_(false),
       pending_seek_(false),
       data_source_(data_source),
       media_log_(media_log),
       bitrate_(0),
       start_time_(kNoTimestamp()),
+      liveness_(LIVENESS_UNKNOWN),
       audio_disabled_(false),
       text_enabled_(false),
       duration_known_(false),
       need_key_cb_(need_key_cb),
       weak_factory_(this) {
   DCHECK(task_runner_.get());
   DCHECK(data_source_);
 }
 
 FFmpegDemuxer::~FFmpegDemuxer() {}
@@ skipping 92 matching lines @@
 
 base::TimeDelta FFmpegDemuxer::GetStartTime() const {
   DCHECK(task_runner_->BelongsToCurrentThread());
   return start_time_;
 }
 
 base::Time FFmpegDemuxer::GetTimelineOffset() const {
   return timeline_offset_;
 }
 
+Demuxer::Liveness FFmpegDemuxer::GetLiveness() const {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  return LIVENESS_UNKNOWN;

[acolwell GONE FROM CHROMIUM, 2014/04/25 23:30:52]

nit: Shouldn't this return liveness_?

[Sergey Ulanov, 2014/04/26 01:51:03]

Yes, it should :)

+}
+
 void FFmpegDemuxer::AddTextStreams() {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   for (StreamVector::size_type idx = 0; idx < streams_.size(); ++idx) {
     FFmpegDemuxerStream* stream = streams_[idx];
     if (stream == NULL || stream->type() != DemuxerStream::TEXT)
       continue;
 
     TextKind kind = stream->GetTextKind();
     std::string title = stream->GetMetadata("title");
@@ skipping 170 matching lines @@
   if (start_time_ == kNoTimestamp())
     start_time_ = base::TimeDelta();
 
   // MPEG-4 B-frames cause grief for a simple container like AVI. Enable PTS
   // generation so we always get timestamps, see http://crbug.com/169570
   if (strcmp(format_context->iformat->name, "avi") == 0)
     format_context->flags |= AVFMT_FLAG_GENPTS;
 
   timeline_offset_ = ExtractTimelineOffset(format_context);
 
+  if (max_duration == kInfiniteDuration() && !timeline_offset_.is_null()) {
+    liveness_ = LIVENESS_LIVE;
+  } else if (max_duration != kInfiniteDuration()) {
+    liveness_ = LIVENESS_RECORDED;
+  } else {
+    liveness_ = LIVENESS_UNKNOWN;
+  }
+
   // Good to go: set the duration and bitrate and notify we're done
   // initializing.
   host_->SetDuration(max_duration);
   duration_known_ = (max_duration != kInfiniteDuration());
 
   int64 filesize_in_bytes = 0;
   url_protocol_->GetSize(&filesize_in_bytes);
   bitrate_ = CalculateBitrate(format_context, max_duration, filesize_in_bytes);
   if (bitrate_ > 0)
     data_source_->SetBitrate(bitrate_);
@@ skipping 293 matching lines @@
   }
   for (size_t i = 0; i < buffered.size(); ++i)
     host_->AddBufferedTimeRange(buffered.start(i), buffered.end(i));
 }
 
 void FFmpegDemuxer::OnDataSourceError() {
   host_->OnDemuxerError(PIPELINE_ERROR_READ);
 }
 
 }  // namespace media