Add CDM video decoder.

webkit/media/crypto/decoders/ffmpeg_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_DECODERS_FFMPEG_VIDEO_DECODER_H_
+#define WEBKIT_MEDIA_CRYPTO_DECODERS_FFMPEG_VIDEO_DECODER_H_
+
+#include "base/compiler_specific.h"
+#include "webkit/media/crypto/decoders/video_decoder.h"
+#include "webkit/media/crypto/ppapi/content_decryption_module.h"
+
+struct AVCodecContext;
+struct AVFrame;
+
+namespace webkit_media {
+
+class FFmpegVideoDecoder : public VideoDecoder {
+ public:
+  FFmpegVideoDecoder();
+  virtual ~FFmpegVideoDecoder();
+  virtual bool Initialize(const cdm::VideoDecoderConfig& config) OVERRIDE;
+  virtual bool DecodeFrame(const cdm::VideoFrame& compressed_frame,
+                           cdm::VideoFrame* decompressed_frame) OVERRIDE;
+
+  // 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);
+
+  static bool IsValidConfig(cdm::VideoFrame::Format format,
+                            const cdm::VideoFrame::Size& data_size);
+
+
+ private:
+  void ReleaseFFmpegResources();
+
+  // FFmpeg structures owned by this object.
+  AVCodecContext* codec_context_;
+  AVFrame* av_frame_;
+
+  FFmpegVideoDecoder(const FFmpegVideoDecoder&);
+  void operator=(const FFmpegVideoDecoder&);
+};
+
+}  // namespace webkit_media
+
+#endif  // WEBKIT_MEDIA_CRYPTO_DECODERS_FFMPEG_VIDEO_DECODER_H_