| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef TIMED_TEXT_SRT_SOURCE_H_ |
| #define TIMED_TEXT_SRT_SOURCE_H_ |
| |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MediaSource.h> |
| #include <utils/Compat.h> // off64_t |
| |
| #include "TimedTextSource.h" |
| |
| namespace android { |
| |
| struct AString; |
| class DataSource; |
| class MediaBuffer; |
| class Parcel; |
| |
| class TimedTextSRTSource : public TimedTextSource { |
| public: |
| TimedTextSRTSource(const sp<DataSource>& dataSource); |
| virtual status_t start(); |
| virtual status_t stop(); |
| virtual status_t read( |
| int64_t *startTimeUs, |
| int64_t *endTimeUs, |
| Parcel *parcel, |
| const MediaSource::ReadOptions *options = NULL); |
| virtual sp<MetaData> getFormat(); |
| |
| protected: |
| virtual ~TimedTextSRTSource(); |
| |
| private: |
| sp<DataSource> mSource; |
| sp<MetaData> mMetaData; |
| |
| struct TextInfo { |
| int64_t endTimeUs; |
| // The offset of the text in the original file. |
| off64_t offset; |
| int textLen; |
| }; |
| |
| size_t mIndex; |
| KeyedVector<int64_t, TextInfo> mTextVector; |
| |
| void reset(); |
| status_t scanFile(); |
| status_t getNextSubtitleInfo( |
| off64_t *offset, int64_t *startTimeUs, TextInfo *info); |
| status_t readNextLine(off64_t *offset, AString *data); |
| status_t getText( |
| const MediaSource::ReadOptions *options, |
| AString *text, int64_t *startTimeUs, int64_t *endTimeUs); |
| status_t extractAndAppendLocalDescriptions( |
| int64_t timeUs, const AString &text, Parcel *parcel); |
| |
| // Compares the time range of the subtitle at index to the given timeUs. |
| // The time range of the subtitle to match with given timeUs is extended to |
| // [endTimeUs of the previous subtitle, endTimeUs of current subtitle). |
| // |
| // This compare function is used to find a next subtitle when read() is |
| // called with seek options. Note that timeUs within gap ranges, such as |
| // [200, 300) in the below example, will be matched to the closest future |
| // subtitle, [300, 400). |
| // |
| // For instance, assuming there are 3 subtitles in mTextVector, |
| // 0: [100, 200) ----> [0, 200) |
| // 1: [300, 400) ----> [200, 400) |
| // 2: [500, 600) ----> [400, 600) |
| // If the 'index' parameter contains 1, this function |
| // returns 0, if timeUs is in [200, 400) |
| // returns -1, if timeUs >= 400, |
| // returns 1, if timeUs < 200. |
| int compareExtendedRangeAndTime(size_t index, int64_t timeUs); |
| |
| DISALLOW_EVIL_CONSTRUCTORS(TimedTextSRTSource); |
| }; |
| |
| } // namespace android |
| |
| #endif // TIMED_TEXT_SRT_SOURCE_H_ |