Play WebM live stream

BUG=44891
TEST=Can play live stream http://195.10.10.75:8800/live.webm

This patch allows a live WebM stream to be played.

After demuxing by FFmpeg, the duration was set to an invalid value. This
makes the video pipeline to set duration to 0, and so WebKit never allows
us to play because currentTime == duration all the time.

This patch sets duration to an infinite value when duration is reported as
invalid in FFmpeg.

Review URL: http://codereview.chromium.org/3031036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54983 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 10 insertions, 1 deletions

diff --git a/media/base/limits.h b/media/base/limits.h
index 583d6dd..8694efa 100644
--- a/media/base/limits.h
+++ b/media/base/limits.h
@@ -20,9 +20,11 @@ struct Limits {
   static const size_t kMaxSampleRate = 192000;
   static const size_t kMaxChannels = 32;
   static const size_t kMaxBPS = 64;
+
+  // Maximum possible time.
+  static const int64 kMaxTimeInMicroseconds = kint64max;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_LIMITS_H_
-
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index daf083e..5c2a913 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -9,6 +9,7 @@
 #include "base/string_util.h"
 #include "base/time.h"
 #include "media/base/filter_host.h"
+#include "media/base/limits.h"
 #include "media/base/media_switches.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 #include "media/ffmpeg/ffmpeg_util.h"
@@ -468,7 +469,13 @@ void FFmpegDemuxer::InitializeTask(DataSource* data_source,
     max_duration =
         std::max(max_duration,
                  ConvertTimestamp(av_time_base, format_context_->duration));
+  } else {
+    // If the duration is not a valid value. Assume that this is a live stream
+    // and we set duration to the maximum int64 number to represent infinity.
+    max_duration = base::TimeDelta::FromMicroseconds(
+        Limits::kMaxTimeInMicroseconds);
   }
+
   // Good to go: set the duration and notify we're done initializing.
   host()->SetDuration(max_duration);
   callback->Run();