Play WebM live stream

media/filters/ffmpeg_demuxer.cc

 // Copyright (c) 2010 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 "base/callback.h"
 #include "base/command_line.h"
 #include "base/scoped_ptr.h"
 #include "base/stl_util-inl.h"
 #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"
 #include "media/filters/bitstream_converter.h"
 #include "media/filters/ffmpeg_demuxer.h"
 #include "media/filters/ffmpeg_glue.h"
 
 namespace media {
 
 //
@@ skipping 440 matching lines @@
     callback->Run();
     return;
   }
   if (format_context_->duration != static_cast<int64_t>(AV_NOPTS_VALUE)) {
     // If there is a duration value in the container use that to find the
     // maximum between it and the duration from A/V streams.
     const AVRational av_time_base = {1, AV_TIME_BASE};
     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);
   }
+

[fgalligan1, 2010/08/03 14:17:38]

Would it be better to check if max_duration == AV_NOPTS_VALUE instead of the
else on the format_context duration. At one point I think ogg files had a
duration on the streams but not on the format_context. 

   // Good to go: set the duration and notify we're done initializing.
   host()->SetDuration(max_duration);
   callback->Run();
 }
 
 void FFmpegDemuxer::SeekTask(base::TimeDelta time, FilterCallback* callback) {
   DCHECK_EQ(MessageLoop::current(), message_loop());
   scoped_ptr<FilterCallback> c(callback);
 
   // Tell streams to flush buffers due to seeking.
@@ skipping 135 matching lines @@
   read_event_.Wait();
   return last_read_bytes_;
 }
 
 void FFmpegDemuxer::SignalReadCompleted(size_t size) {
   last_read_bytes_ = size;
   read_event_.Signal();
 }
 
 }  // namespace media