Add JPEG decoder for VAAPI JPEG decode acceleration

content/common/gpu/media/vaapi_jpeg_decoder.h

+// Copyright 2015 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 CONTENT_COMMON_GPU_MEDIA_VAAPI_JPEG_DECODER_H_
+#define CONTENT_COMMON_GPU_MEDIA_VAAPI_JPEG_DECODER_H_
+
+#include "base/macros.h"
+#include "content/common/content_export.h"
+#include "content/common/gpu/media/vaapi_wrapper.h"
+
+namespace media {
+struct JpegParseResult;
+}  // namespace media
+
+namespace content {
+
+// A JPEG decoder that utilizes VA-API hardware video decode acceleration on
+// Intel systems. Provides functionality to allow plugging VAAPI HW
+// acceleration into the JDA framework.
+//
+// Clients of this class are expected to manage VA surfaces created via
+// VaapiWrapper, parse JPEG picture via ParseJpegPicture, and then pass them to
+// this class.
+//
+// This class must be called on a single thread, and does nothing internally on
+// any other thread.
+class CONTENT_EXPORT VaapiJpegDecoder {
+ public:
+  // |vaapi_wrapper| should be initialized.

[Owen Lin, 2015/01/19 09:29:31]

Can you explain more on what the wrapper you would be expected?

[kcwu, 2015/01/19 09:58:18]

Done.

+  VaapiJpegDecoder(VaapiWrapper* vaapi_wrapper);
+
+  ~VaapiJpegDecoder();
+
+  // Decode a JPEG picture. It will fill VA-API parameters and call
+  // cooresponding VA-API methods according to parsed JPEG result

[Owen Lin, 2015/01/19 09:29:31]

s/cooresponding/corresponding/

[kcwu, 2015/01/19 09:58:17]

Done.

+  // |parse_result|. Decoded data will be output to given |va_surface|.

[Owen Lin, 2015/01/19 09:29:31]

be outputted to the given ?

[kcwu, 2015/01/19 09:58:18]

Done.

+  // Return false on failure.
+  bool Decode(const media::JpegParseResult& parse_result,
+              VASurfaceID va_surface);
+
+ private:
+  VaapiWrapper* vaapi_wrapper_;
+
+  DISALLOW_COPY_AND_ASSIGN(VaapiJpegDecoder);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_VAAPI_JPEG_DECODER_H_