Add CDM video decoder.

webkit/media/crypto/ppapi/ffmpeg_cdm_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 WEBKIT_MEDIA_CRYPTO_PPAPI_FFMPEG_CDM_VIDEO_DECODER_H_
+#define WEBKIT_MEDIA_CRYPTO_PPAPI_FFMPEG_CDM_VIDEO_DECODER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "webkit/media/crypto/ppapi/content_decryption_module.h"
+
+struct AVCodecContext;
+struct AVFrame;
+
+namespace webkit_media {
+
+class FFmpegCdmVideoDecoder {
+ public:
+  FFmpegCdmVideoDecoder(cdm::Allocator* allocator);
+  ~FFmpegCdmVideoDecoder();
+  bool Initialize(const cdm::VideoDecoderConfig& config);
+  void Deinitialize();
+  void Reset();
+
+  // Decodes |compressed_frame|. Stores output frame in |decoded_frame| and
+  // returns |cdm::kSuccess| when an output frame is available. Returns
+  // |cdm::kNeedMoreData| when |compressed_frame| does not produce an output
+  // frame. Returns |cdm::kDecodeError| when decoding fails.
+  cdm::Status DecodeFrame(const uint8_t* compressed_frame,
+                          int32_t compressed_frame_size,
+                          int64_t timestamp,
+                          cdm::VideoFrame* decoded_frame);
+
+  // Callback called from within FFmpeg to allocate a buffer based on
+  // the dimensions of |codec_context|. See AVCodecContext.get_buffer
+  // documentation inside FFmpeg.
+  int GetVideoBuffer(AVCodecContext* codec_context, AVFrame* frame);
+
+ private:
+  void ReleaseFFmpegResources();
+
+  // FFmpeg structures owned by this object.
+  AVCodecContext* codec_context_;
+  AVFrame* av_frame_;
+
+  bool is_initialized_;
+
+  cdm::Allocator* const allocator_;
+  cdm::VideoDecoderConfig config_;
+
+  DISALLOW_COPY_AND_ASSIGN(FFmpegCdmVideoDecoder);
+};
+
+}  // namespace webkit_media
+
+#endif  // WEBKIT_MEDIA_CRYPTO_PPAPI_FFMPEG_CDM_VIDEO_DECODER_H_