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 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 const int64 seek_preroll, 35 const int64 codec_delay, 36 bool is_encrypted, 37 AudioDecoderConfig* config); 38 39 private: 40 // WebMParserClient implementation. 41 virtual bool OnUInt(int id, int64 val) OVERRIDE; 42 virtual bool OnFloat(int id, double val) OVERRIDE; 43 44 LogCB log_cb_; 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_ 55
