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/*
* 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 {
class 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_
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