Add Mojo interfaces for GpuJpegDecodeAccelerator and GpuJpegDecodeAcceleratorHost

media/gpu/mojo/jpeg_decoder.mojom

Index: media/gpu/mojo/jpeg_decoder.mojom
diff --git a/media/gpu/mojo/jpeg_decoder.mojom b/media/gpu/mojo/jpeg_decoder.mojom
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index 0000000000000000000000000000000000000000..3264ee7d3b56804b64d0aa28dab85b0b202ca983
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+++ b/media/gpu/mojo/jpeg_decoder.mojom
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+// Copyright 2017 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.
+
+module media.mojom;
+
+import "media/mojo/interfaces/media_types.mojom";
+import "mojo/common/time.mojom";
+import "ui/gfx/geometry/mojo/geometry.mojom";
+
+// Decode errors (see media/video/jpeg_decode_accelerator.h).
+enum Error {
+  NO_ERRORS,
+  INVALID_ARGUMENT,
+  UNREADABLE_INPUT,
+  PARSE_JPEG_FAILED,
+  UNSUPPORTED_JPEG,
+  PLATFORM_FAILURE,
+};
+
+// This defines a mojo transport format for media::BitstreamBuffer (see
+// media/base/bitstream_buffer.h).
+struct BitstreamBuffer {
+  int32 id;
+  handle<shared_buffer> memory_handle;
+  uint32 size;
+  uint64 offset;
+  mojo.common.mojom.TimeDelta timestamp;
+  string key_id;
+  string iv;
+  array<SubsampleEntry> subsamples;
+};
+
+// GPU process interface exposed to the browser for decoding JPEG images.
+interface GpuJpegDecodeAccelerator {
+  // Initializes the JPEG decoder. Should be called once per decoder
+  // construction and before using Decode(). This call returns true if
+  // initialization is successful.
+  // TODO(c.padhi): Make this method asynchronous.
+  [Sync]
+  Initialize() => (bool success);
+
+  // Decodes the given bitstream buffer that contains one JPEG image.
+  // The image is decoded from shared memory |input_buffer.memory_handle|
+  // with size |input_buffer.size|. The input buffer is associated with
+  // |input_buffer.id|and the size of JPEG image is |coded_size|. Decoded I420
+  // frame data will be put onto shared memory associated with |output_handle|
+  // with allocated size |output_buffer_size|.
+  // Returns |bitstream_buffer_id| and |error| in a callback to notify the
+  // decode status. |bitstream_buffer_id| is the id of BitstreamBuffer
+  // |input_buffer| and |error| is the error code.
+  Decode(BitstreamBuffer input_buffer, gfx.mojom.Size coded_size,
+         handle<shared_buffer> output_handle, uint32 output_buffer_size)
+      => (int32 bitstream_buffer_id, Error error);
+
+  // TODO(c.padhi): This method might not be required, see
+  // http://crbug.com/699255.
+  Uninitialize();
+};