MJPEG acceleration for video capture using VAAPI

media/video/jpeg_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.
 
 #ifndef MEDIA_VIDEO_JPEG_DECODE_ACCELERATOR_H_
 #define MEDIA_VIDEO_JPEG_DECODE_ACCELERATOR_H_
 
 #include "base/basictypes.h"
 #include "media/base/bitstream_buffer.h"
 #include "media/base/media_export.h"
 #include "media/base/video_frame.h"
 
 namespace media {
 
 // JPEG decoder interface.
 // The input are JPEG images including headers (Huffman tables may be omitted).
 // The output color format is I420. The decoder will convert the color format
 // to I420 if the color space or subsampling does not match that and if it is
 // capable of doing so. The client is responsible for allocating buffers and
-// keeps the ownership of them. All methods must be called on the same thread.
+// keeps the ownership of them.

[wuchengli, 2015/04/15 07:11:59]

Initialize and Destroy must be called on the same thread. Right? Document it if
that's the case.

[kcwu, 2015/04/20 17:47:59]

Done.

 // The intended use case of this interface is decoding MJPEG images coming
 // from camera capture. It can also be used for normal still JPEG image
 // decoding, but normal JPEG images may use more JPEG features that may not be
 // supported by a particular accelerator implementation and/or platform.
 class MEDIA_EXPORT JpegDecodeAccelerator {
  public:
   static const int32_t kInvalidBitstreamBufferId = -1;
 
   // Enumeration of decode errors generated by NotifyError callback.
   enum Error {
@@ skipping 94 matching lines @@
 // uses "Destroy()" instead of trying to use the destructor.
 template <>
 struct MEDIA_EXPORT DefaultDeleter<media::JpegDecodeAccelerator> {
  public:
   void operator()(void* jpeg_decode_accelerator) const;
 };
 
 }  // namespace base
 
 #endif  // MEDIA_VIDEO_JPEG_DECODE_ACCELERATOR_H_