MediaPlayer 同步加载字幕与手动解析字幕

谁借莪１个温暖的怀抱￠ 2022-08-18 10:53 178阅读 0赞

通过把 字幕文件传给MediaPlayer  , media 可以在自动的适配字幕, 在正确的时间点, 给我们 当前应该显示的字幕回调

不过只能在 API 16 以上才能使用

mMediaPlayer = new MediaPlayer();
    
    try {
        mMediaPlayer.addTimedTextSource(path, MediaPlayer.MEDIA_MIMETYPE_TEXT_SUBRIP);
    } catch (IOException e) {
        e.printStackTrace();
    }
    MediaPlayer.TrackInfo[] trackInfos = mMediaPlayer.getTrackInfo();
    
    if (trackInfos != null && trackInfos.length > 0) {
        for (int i = 0; i < trackInfos.length; i++) {
            final MediaPlayer.TrackInfo info = trackInfos[i];
    
            LogUtil.w(TAG, "TrackInfo: " + info.getTrackType() + " "
                    + info.getLanguage());
    
            if (info.getTrackType() == MediaPlayer.TrackInfo.MEDIA_TRACK_TYPE_AUDIO) {
                // mMediaPlayer.selectTrack(i);
            } else if (info.getTrackType() == MediaPlayer.TrackInfo.MEDIA_TRACK_TYPE_TIMEDTEXT) {
                mMediaPlayer.selectTrack(i);
            }
        }
    }
    mMediaPlayer.setOnTimedTextListener(new MediaPlayer.OnTimedTextListener() {
        @Override
        public void onTimedText(MediaPlayer mp, TimedText text) {
            if (text != null) {
                LogUtil.d(TAG, "text = " + text.getText());
            }
        }
    });

当然也可手动解析字幕

下面是解析字幕的相关代码 (解析的 是 srt 字幕)

public class SrtHelper {
        public static final String TAG = "SrtHelper";
    
        private List<SrtModel> mSrtModelList;
    
        public String getTimeText(int timeMils) {
            String currentTimeTxt = "";
            if (mSrtModelList != null && !mSrtModelList.isEmpty()) {
                for (SrtModel srtModel : mSrtModelList) {
                    if (timeMils > srtModel.getBeginTime() && timeMils < srtModel.getEndTime()) {
                        // 时当前该显示的字幕
                        currentTimeTxt = srtModel.getSrtBody();
                    }
                }
            }
            return currentTimeTxt;
        }
    
        public int getTimeTextIndex(int timeMils) {
            int index = -1;
            if (mSrtModelList != null && !mSrtModelList.isEmpty()) {
                for (int i = 0; i < mSrtModelList.size(); i++) {
                    SrtModel srtModel = mSrtModelList.get(i);
                    if (timeMils > srtModel.getBeginTime() && timeMils < srtModel.getEndTime()) {
                        // 时当前该显示的字幕
                        index = i;
                        break;
                    }
                }
            }
            return index;
        }
    
        public SrtModel get(int index) {
            if (mSrtModelList != null && !mSrtModelList.isEmpty()) {
                return mSrtModelList.get(index);
            }
            return null;
        }
    
        public List<String> getSrtStringList() {
            List<String> list = new ArrayList<>();
            if (mSrtModelList != null && !mSrtModelList.isEmpty()) {
                for (SrtModel srtModel : mSrtModelList) {
                    list.add(srtModel.getSrtBody());
                }
            }
            return list;
        }
    
        public void parseSrt(String srtPath) {
            File srtFil = new File(srtPath);
            try {
                if (mSrtModelList == null) {
                    mSrtModelList = new ArrayList<>();
                } else {
                    mSrtModelList.clear();
                }
    
                FileReader fr = new FileReader(srtFil); //创建文件输入流
                BufferedReader br = new BufferedReader(fr);
                String line;
    
                StringBuffer sb = new StringBuffer();
                while ((line = br.readLine()) != null) {
                    if (!line.equals("")) {
                        sb.append(line).append("@");
                        continue;
                    }
                    String[] parseStrs = sb.toString().split("@");
    
                    if (parseStrs.length < 3) {
                        sb.delete(0, sb.length());// 清空，否则影响下一个字幕元素的解析</i>
                        continue;
                    }
    
                    SrtModel srt = new SrtModel();
                    String timeTotime = parseStrs[1];
                    int begin_hour = Integer.parseInt(timeTotime.substring(0, 2));
                    int begin_mintue = Integer.parseInt(timeTotime.substring(3, 5));
                    int begin_scend = Integer.parseInt(timeTotime.substring(6, 8));
                    int begin_milli = Integer.parseInt(timeTotime.substring(9, 12));
                    int beginTime = (begin_hour * 3600 + begin_mintue * 60 + begin_scend) * 1000 + begin_milli;
    
                    int end_hour = Integer.parseInt(timeTotime.substring(17, 19));
                    int end_mintue = Integer.parseInt(timeTotime.substring(20, 22));
                    int end_scend = Integer.parseInt(timeTotime.substring(23, 25));
                    int end_milli = Integer.parseInt(timeTotime.substring(26, 29));
                    int endTime = (end_hour * 3600 + end_mintue * 60 + end_scend) * 1000 + end_milli;
    
                    LogUtil.d(TAG, "开始:"
                            + begin_hour + ":"
                            + begin_mintue + ":"
                            + begin_scend + ":"
                            + begin_milli + "="
                            + beginTime + "ms");
                    LogUtil.d(TAG, "结束:"
                            + end_hour + ":"
                            + end_mintue + ":"
                            + end_scend + ":"
                            + end_milli + "="
                            + endTime + "ms");
    
                    String srtBody = "";
                    for (int i = 2; i < parseStrs.length; i++) {
                        srtBody += parseStrs[i] + "\n";
                    }
                    LogUtil.d(TAG, "srtBody = " + srtBody);
                    // 删除最后一个"\n"
                    srtBody = srtBody.substring(0, srtBody.length() - 1);
                    srt.setBeginTime(beginTime);
                    srt.setEndTime(endTime);
                    srt.setSrtBody(new String(srtBody.getBytes(), "UTF-8"));
    
                    mSrtModelList.add(srt);
                    sb.delete(0, sb.length());// 清空，否则影响下一个字幕元素的解析
                }
    
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
    }