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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef AC4_PARSER_H_
     18 #define AC4_PARSER_H_
     19 
     20 #include <cstdint>
     21 #include <map>
     22 #include <string>
     23 
     24 #include <media/stagefright/foundation/ABitReader.h>
     25 
     26 namespace android {
     27 
     28 class AC4Parser {
     29 public:
     30     AC4Parser();
     31     virtual ~AC4Parser() { }
     32 
     33     virtual bool parse() = 0;
     34 
     35     struct AC4Presentation {
     36         int32_t mChannelMode = -1;
     37         int32_t mProgramID = -1;
     38         int32_t mGroupIndex = -1;
     39 
     40         // TS 103 190-1 v1.2.1 4.3.3.8.1
     41         enum ContentClassifiers {
     42             kCompleteMain,
     43             kMusicAndEffects,
     44             kVisuallyImpaired,
     45             kHearingImpaired,
     46             kDialog,
     47             kCommentary,
     48             kEmergency,
     49             kVoiceOver
     50         };
     51 
     52         uint32_t mContentClassifier = kCompleteMain;
     53 
     54         // ETSI TS 103 190-2 V1.1.1 (2015-09) Table 79: channel_mode
     55         enum InputChannelMode {
     56             kChannelMode_Mono,
     57             kChannelMode_Stereo,
     58             kChannelMode_3_0,
     59             kChannelMode_5_0,
     60             kChannelMode_5_1,
     61             kChannelMode_7_0_34,
     62             kChannelMode_7_1_34,
     63             kChannelMode_7_0_52,
     64             kChannelMode_7_1_52,
     65             kChannelMode_7_0_322,
     66             kChannelMode_7_1_322,
     67             kChannelMode_7_0_4,
     68             kChannelMode_7_1_4,
     69             kChannelMode_9_0_4,
     70             kChannelMode_9_1_4,
     71             kChannelMode_22_2,
     72             kChannelMode_Reserved,
     73         };
     74 
     75         bool mHasDialogEnhancements = false;
     76         bool mPreVirtualized = false;
     77         bool mEnabled = true;
     78 
     79         std::string mLanguage;
     80         std::string mDescription;
     81     };
     82     typedef std::map<uint32_t, AC4Presentation> AC4Presentations;
     83 
     84     const AC4Presentations& getPresentations() const { return mPresentations; }
     85 
     86 protected:
     87     AC4Presentations mPresentations;
     88 };
     89 
     90 class AC4DSIParser: public AC4Parser {
     91 public:
     92     explicit AC4DSIParser(ABitReader &br);
     93     virtual ~AC4DSIParser() { }
     94 
     95     bool parse();
     96 
     97 private:
     98     bool parseSubstreamDSI(uint32_t presentationID, uint32_t substreamID);
     99     bool parseSubstreamGroupDSI(uint32_t presentationID, uint32_t groupID);
    100     bool parseLanguageTag(uint32_t presentationID, uint32_t substreamID);
    101     bool parseBitrateDsi();
    102 
    103     uint64_t mDSISize;
    104     ABitReader& mBitReader;
    105 };
    106 
    107 };
    108 
    109 #endif  // AC4_PARSER_H_
    110