1 /* 2 * Copyright 2012, 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 MEDIA_CODEC_LIST_WRITER_H_ 18 19 #define MEDIA_CODEC_LIST_WRITER_H_ 20 21 #include <media/stagefright/foundation/ABase.h> 22 #include <media/stagefright/MediaCodecListWriter.h> 23 #include <media/MediaCodecInfo.h> 24 25 #include <utils/Errors.h> 26 #include <utils/StrongPointer.h> 27 28 namespace android { 29 30 /** 31 * This class is to be used by a `MediaCodecListBuilderBase` instance to add 32 * information to the destination `MediaCodecList` object. 33 */ 34 struct MediaCodecListWriter { 35 /** 36 * Add a key-value pair to a `MediaCodecList`'s global settings. 37 * 38 * @param key Key. 39 * @param value Value. 40 */ 41 void addGlobalSetting(const char* key, const char* value); 42 /** 43 * Create an add a new `MediaCodecInfo` object for a `MediaCodecList`, and 44 * return a `MediaCodecInfoWriter` object associated with the newly added 45 * `MediaCodecInfo`. 46 * 47 * @return The `MediaCodecInfoWriter` object associated with the newly 48 * added `MediaCodecInfo` object. 49 */ 50 std::unique_ptr<MediaCodecInfoWriter> addMediaCodecInfo(); 51 /** 52 * Find an existing `MediaCodecInfo` object for a codec name and return a 53 * `MediaCodecInfoWriter` object associated with the found added `MediaCodecInfo`. 54 * 55 * @return The `MediaCodecInfoWriter` object if found, or nullptr if not found. 56 */ 57 std::unique_ptr<MediaCodecInfoWriter> findMediaCodecInfo(const char *codecName); 58 private: 59 MediaCodecListWriter() = default; 60 61 void writeGlobalSettings(const sp<AMessage> &globalSettings) const; 62 void writeCodecInfos(std::vector<sp<MediaCodecInfo>> *codecInfos) const; 63 64 std::vector<std::pair<std::string, std::string>> mGlobalSettings; 65 std::vector<sp<MediaCodecInfo>> mCodecInfos; 66 67 friend struct MediaCodecList; 68 }; 69 70 /** 71 * This interface is to be used by `MediaCodecList` to fill its members with 72 * appropriate information. `buildMediaCodecList()` will be called from a 73 * `MediaCodecList` object during its construction. 74 */ 75 struct MediaCodecListBuilderBase { 76 /** 77 * Build the `MediaCodecList` via the given `MediaCodecListWriter` interface. 78 * 79 * @param writer The writer interface. 80 * @return The status of the construction. `NO_ERROR` means success. 81 */ 82 virtual status_t buildMediaCodecList(MediaCodecListWriter* writer) = 0; 83 84 /** 85 * The default destructor does nothing. 86 */ 87 virtual ~MediaCodecListBuilderBase() = default; 88 89 typedef MediaCodecListBuilderBase *(*CreateBuilderFunc)(void); 90 }; 91 92 } // namespace android 93 94 #endif // MEDIA_CODEC_LIST_WRITER_H_ 95 96