Add support for multiple V4L2 video devices of the same type.

media/gpu/v4l2_video_decode_accelerator.h

 // Copyright 2014 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.
 //
 // This file contains an implementation of VideoDecodeAccelerator
 // that utilizes hardware video decoders, which expose Video4Linux 2 API
 // (http://linuxtv.org/downloads/v4l-dvb-apis/).
 
 #ifndef MEDIA_GPU_V4L2_VIDEO_DECODE_ACCELERATOR_H_
 #define MEDIA_GPU_V4L2_VIDEO_DECODE_ACCELERATOR_H_
@@ skipping 509 matching lines @@
   // EGL state
   EGLDisplay egl_display_;
 
   // Callback to get current GLContext.
   GetGLContextCallback get_gl_context_cb_;
   // Callback to set the correct gl context.
   MakeGLContextCurrentCallback make_context_current_cb_;
 
   // The codec we'll be decoding for.
   VideoCodecProfile video_profile_;
+  // Chosen input format for video_profile_.
+  uint32_t input_format_fourcc_;
   // Chosen output format.
   uint32_t output_format_fourcc_;
 
   // Image processor device, if one is in use.
   scoped_refptr<V4L2Device> image_processor_device_;
   // Image processor. Accessed on |decoder_thread_|.
   std::unique_ptr<V4L2ImageProcessor> image_processor_;
 
   // The V4L2Device EGLImage is created from.
   scoped_refptr<V4L2Device> egl_image_device_;
@@ skipping 14 matching lines @@
 
   // The WeakPtrFactory for |weak_this_|.
   base::WeakPtrFactory<V4L2VideoDecodeAccelerator> weak_this_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(V4L2VideoDecodeAccelerator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_GPU_V4L2_VIDEO_DECODE_ACCELERATOR_H_