media/webm/webm_audio_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_AUDIO_CLIENT_H_
   6 #define MEDIA_WEBM_WEBM_AUDIO_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 AudioDecoderConfig;
  16
  17 // Helper class used to parse an Audio element inside a TrackEntry element.
  18 class WebMAudioClient : public WebMParserClient {
  19  public:
  20   explicit WebMAudioClient(const LogCB& log_cb);
  21   virtual ~WebMAudioClient();
  22
  23   // Reset this object's state so it can process a new audio 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 audio 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   // audio track element fields.
  32   bool InitializeConfig(const std::string& codec_id,
  33                         const std::vector<uint8>& codec_private,
  34                         bool is_encrypted,
  35                         AudioDecoderConfig* config);
  36
  37  private:
  38   // WebMParserClient implementation.
  39   virtual bool OnUInt(int id, int64 val) OVERRIDE;
  40   virtual bool OnFloat(int id, double val) OVERRIDE;
  41
  42   LogCB log_cb_;
  43   int channels_;
  44   double samples_per_second_;
  45   double output_samples_per_second_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(WebMAudioClient);
  48 };
  49
  50 }  // namespace media
  51
  52 #endif  // MEDIA_WEBM_WEBM_AUDIO_CLIENT_H_