Decryptors can report kNoKey to WebMediaPlayer

media/base/video_decoder.h

 // 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.
 
 #ifndef MEDIA_BASE_VIDEO_DECODER_H_
 #define MEDIA_BASE_VIDEO_DECODER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 35 matching lines @@
   // Note: Since this is a destructor, |this| will be destroyed after this call.
   // Make sure the callbacks fired from this call doesn't post any task that
   // depends on |this|.
   virtual ~VideoDecoder();
 
   // Returns the name of the decoder for logging purpose.
   virtual std::string GetDisplayName() const = 0;
 
   // Initializes a VideoDecoder with the given |config|, executing the
   // |status_cb| upon completion. |output_cb| is called for each output frame
-  // decoded by Decode().
+  // decoded by Decode(). |waiting_for_encryption_key_cb| is called for

[ddorwin, 2015/02/19 05:33:17]

dittos

[jrummell, 2015/02/23 22:06:32]

Done.

+  // encrypted streams whenever a new key is required in order to decrypt
+  // the stream.
   //
   // If |low_delay| is true then the decoder is not allowed to queue frames,
   // except for out-of-order frames, i.e. if the next frame can be returned it
   // must be returned without waiting for Decode() to be called again.
   // Initialization should fail if |low_delay| is true and the decoder cannot
   // satisfy the requirements above.
   //
   // Note:
   // 1) The VideoDecoder will be reinitialized if it was initialized before.
   //    Upon reinitialization, all internal buffered frames will be dropped.
   // 2) This method should not be called during pending decode or reset.
   // 3) No VideoDecoder calls should be made before |status_cb| is executed.
-  virtual void Initialize(const VideoDecoderConfig& config,
-                          bool low_delay,
-                          const PipelineStatusCB& status_cb,
-                          const OutputCB& output_cb) = 0;
+  virtual void Initialize(
+      const VideoDecoderConfig& config,
+      bool low_delay,
+      const PipelineStatusCB& status_cb,
+      const OutputCB& output_cb,
+      const base::Closure& waiting_for_encryption_key_cb) = 0;
 
   // Requests a |buffer| to be decoded. The status of the decoder and decoded
   // frame are returned via the provided callback. Some decoders may allow
   // decoding multiple buffers in parallel. Callers should call
   // GetMaxDecodeRequests() to get number of buffers that may be decoded in
   // parallel. Decoder must call |decode_cb| in the same order in which Decode()
   // is called.
   //
   // Implementations guarantee that the callback will not be called from within
   // this method and that |decode_cb| will not be blocked on the following
@@ skipping 29 matching lines @@
   // Returns maximum number of parallel decode requests.
   virtual int GetMaxDecodeRequests() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_DECODER_H_