Add WebMediaPlayer::timelineOffset() support to WebMediaPlayerImpl.

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 16 matching lines @@
 #include "media/base/media_log.h"
 #include "media/base/video_decoder_config.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 #include "media/filters/ffmpeg_glue.h"
 #include "media/filters/ffmpeg_h264_to_annex_b_bitstream_converter.h"
 #include "media/filters/webvtt_util.h"
 #include "media/formats/webm/webm_crypto_helpers.h"
 
 namespace media {
 
+static base::Time ExtractTimelineOffset(AVFormatContext* format_context) {
+  if (strstr(format_context->iformat->name, "webm") ||
+      strstr(format_context->iformat->name, "matroska")) {
+    const AVDictionaryEntry* entry =
+        av_dict_get(format_context->metadata, "creation_time", NULL, 0);
+
+    base::Time timeline_offset;
+    if (entry != NULL && entry->value != NULL &&
+        FFmpegUTCDateToTime(entry->value, &timeline_offset)) {
+      return timeline_offset;
+    }
+  }
+
+  return base::Time();
+}
+
 //
 // FFmpegDemuxerStream
 //
 FFmpegDemuxerStream::FFmpegDemuxerStream(
     FFmpegDemuxer* demuxer,
     AVStream* stream)
     : demuxer_(demuxer),
       task_runner_(base::MessageLoopProxy::current()),
       stream_(stream),
       type_(UNKNOWN),
@@ skipping 432 matching lines @@
     }
   }
   return NULL;
 }
 
 base::TimeDelta FFmpegDemuxer::GetStartTime() const {
   DCHECK(task_runner_->BelongsToCurrentThread());
   return start_time_;
 }
 
+base::Time FFmpegDemuxer::GetTimelineOffset() const {
+  return timeline_offset_;
+}
+
 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 168 matching lines @@
   // Some demuxers, like WAV, do not put timestamps on their frames. We
   // assume the the start time is 0.
   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);
+
   // 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