media/webm/webm_video_client.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_WEBM_WEBM_VIDEO_CLIENT_H_
   6 #define MEDIA_WEBM_WEBM_VIDEO_CLIENT_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "media/base/media_log.h"
  12 #include "media/webm/webm_parser.h"
  13
  14 namespace media {
  15 class VideoDecoderConfig;
  16
  17 // Helper class used to parse a Video element inside a TrackEntry element.
  18 class WebMVideoClient : public WebMParserClient {
  19  public:
  20   explicit WebMVideoClient(const LogCB& log_cb);
  21   virtual ~WebMVideoClient();
  22
  23   // Reset this object's state so it can process a new video track element.
  24   void Reset();
  25
  26   // Initialize |config| with the data in |codec_id|, |codec_private|,
  27   // |is_encrypted| and the fields parsed from the last video track element this
  28   // object was used to parse.
  29   // Returns true if |config| was successfully initialized.
  30   // Returns false if there was unexpected values in the provided parameters or
  31   // video track element fields. The contents of |config| are undefined in this
  32   // case and should not be relied upon.
  33   bool InitializeConfig(const std::string& codec_id,
  34                         const std::vector<uint8>& codec_private,
  35                         bool is_encrypted,
  36                         VideoDecoderConfig* config);
  37
  38  private:
  39   // WebMParserClient implementation.
  40   virtual bool OnUInt(int id, int64 val) OVERRIDE;
  41   virtual bool OnBinary(int id, const uint8* data, int size) OVERRIDE;
  42   virtual bool OnFloat(int id, double val) OVERRIDE;
  43
  44   LogCB log_cb_;
  45   int64 pixel_width_;
  46   int64 pixel_height_;
  47   int64 crop_bottom_;
  48   int64 crop_top_;
  49   int64 crop_left_;
  50   int64 crop_right_;
  51   int64 display_width_;
  52   int64 display_height_;
  53   int64 display_unit_;
  54   int64 alpha_mode_;
  55
  56   DISALLOW_COPY_AND_ASSIGN(WebMVideoClient);
  57 };
  58
  59 }  // namespace media
  60
  61 #endif  // MEDIA_WEBM_WEBM_VIDEO_CLIENT_H_