media/formats/webm/webm_audio_client.h

   1 // Copyright 2014 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_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_
   6 #define MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "media/base/media_log.h"
  12 #include "media/formats/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 scoped_refptr<MediaLog>& media_log);
  21   ~WebMAudioClient() override;
  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                         const int64 seek_preroll,
  35                         const int64 codec_delay,
  36                         bool is_encrypted,
  37                         AudioDecoderConfig* config);
  38
  39  private:
  40   // WebMParserClient implementation.
  41   bool OnUInt(int id, int64 val) override;
  42   bool OnFloat(int id, double val) override;
  43
  44   scoped_refptr<MediaLog> media_log_;
  45   int channels_;
  46   double samples_per_second_;
  47   double output_samples_per_second_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(WebMAudioClient);
  50 };
  51
  52 }  // namespace media
  53
  54 #endif  // MEDIA_FORMATS_WEBM_WEBM_AUDIO_CLIENT_H_