Java MimeTypes.APPLICATION_TTML属性代码示例

@Override
public SubtitleDecoder createDecoder(Format format) {
  switch (format.sampleMimeType) {
    case MimeTypes.TEXT_VTT:
      return new WebvttDecoder();
    case MimeTypes.APPLICATION_MP4VTT:
      return new Mp4WebvttDecoder();
    case MimeTypes.APPLICATION_TTML:
      return new TtmlDecoder();
    case MimeTypes.APPLICATION_SUBRIP:
      return new SubripDecoder();
    case MimeTypes.APPLICATION_TX3G:
      return new Tx3gDecoder(format.initializationData);
    case MimeTypes.APPLICATION_CEA608:
    case MimeTypes.APPLICATION_MP4CEA608:
      return new Cea608Decoder(format.sampleMimeType, format.accessibilityChannel);
    case MimeTypes.APPLICATION_CEA708:
      return new Cea708Decoder(format.accessibilityChannel);
    case MimeTypes.APPLICATION_DVBSUBS:
      return new DvbDecoder(format.initializationData);
    default:
      throw new IllegalArgumentException("Attempted to create decoder for unsupported format");
  }
}
 

/**
 * Derives a sample mimeType from a container mimeType and codecs attribute.
 *
 * @param containerMimeType The mimeType of the container.
 * @param codecs The codecs attribute.
 * @return The derived sample mimeType, or null if it could not be derived.
 */
private static String getSampleMimeType(String containerMimeType, String codecs) {
  if (MimeTypes.isAudio(containerMimeType)) {
    return MimeTypes.getAudioMediaMimeType(codecs);
  } else if (MimeTypes.isVideo(containerMimeType)) {
    return MimeTypes.getVideoMediaMimeType(codecs);
  } else if (mimeTypeIsRawText(containerMimeType)) {
    return containerMimeType;
  } else if (MimeTypes.APPLICATION_MP4.equals(containerMimeType)) {
    if ("stpp".equals(codecs)) {
      return MimeTypes.APPLICATION_TTML;
    } else if ("wvtt".equals(codecs)) {
      return MimeTypes.APPLICATION_MP4VTT;
    }
  } else if (MimeTypes.APPLICATION_RAWCC.equals(containerMimeType)) {
    if (codecs != null) {
      if (codecs.contains("cea708")) {
        return MimeTypes.APPLICATION_CEA708;
      } else if (codecs.contains("eia608") || codecs.contains("cea608")) {
        return MimeTypes.APPLICATION_CEA608;
      }
    }
    return null;
  }
  return null;
}
 

private static String fourCCToMimeType(String fourCC) {
  if (fourCC.equalsIgnoreCase("H264") || fourCC.equalsIgnoreCase("X264")
      || fourCC.equalsIgnoreCase("AVC1") || fourCC.equalsIgnoreCase("DAVC")) {
    return MimeTypes.VIDEO_H264;
  } else if (fourCC.equalsIgnoreCase("AAC") || fourCC.equalsIgnoreCase("AACL")
      || fourCC.equalsIgnoreCase("AACH") || fourCC.equalsIgnoreCase("AACP")) {
    return MimeTypes.AUDIO_AAC;
  } else if (fourCC.equalsIgnoreCase("TTML")) {
    return MimeTypes.APPLICATION_TTML;
  } else if (fourCC.equalsIgnoreCase("ac-3") || fourCC.equalsIgnoreCase("dac3")) {
    return MimeTypes.AUDIO_AC3;
  } else if (fourCC.equalsIgnoreCase("ec-3") || fourCC.equalsIgnoreCase("dec3")) {
    return MimeTypes.AUDIO_E_AC3;
  } else if (fourCC.equalsIgnoreCase("dtsc")) {
    return MimeTypes.AUDIO_DTS;
  } else if (fourCC.equalsIgnoreCase("dtsh") || fourCC.equalsIgnoreCase("dtsl")) {
    return MimeTypes.AUDIO_DTS_HD;
  } else if (fourCC.equalsIgnoreCase("dtse")) {
    return MimeTypes.AUDIO_DTS_EXPRESS;
  } else if (fourCC.equalsIgnoreCase("opus")) {
    return MimeTypes.AUDIO_OPUS;
  }
  return null;
}
 

private Class<?> getDecoderClass(String mimeType) {
  try {
    switch (mimeType) {
      case MimeTypes.TEXT_VTT:
        return Class.forName("com.google.android.exoplayer2.text.webvtt.WebvttDecoder");
      case MimeTypes.APPLICATION_TTML:
        return Class.forName("com.google.android.exoplayer2.text.ttml.TtmlDecoder");
      case MimeTypes.APPLICATION_MP4VTT:
        return Class.forName("com.google.android.exoplayer2.text.webvtt.Mp4WebvttDecoder");
      case MimeTypes.APPLICATION_SUBRIP:
        return Class.forName("com.google.android.exoplayer2.text.subrip.SubripDecoder");
      case MimeTypes.APPLICATION_TX3G:
        return Class.forName("com.google.android.exoplayer2.text.tx3g.Tx3gDecoder");
      case MimeTypes.APPLICATION_CEA608:
        return Class.forName("com.google.android.exoplayer2.text.cea.Cea608Decoder");
      default:
        return null;
    }
  } catch (ClassNotFoundException e) {
    return null;
  }
}
 

/**
 * Derives a sample mimeType from a container mimeType and codecs attribute.
 *
 * @param containerMimeType The mimeType of the container.
 * @param codecs The codecs attribute.
 * @return The derived sample mimeType, or null if it could not be derived.
 */
private static String getSampleMimeType(String containerMimeType, String codecs) {
  if (MimeTypes.isAudio(containerMimeType)) {
    return MimeTypes.getAudioMediaMimeType(codecs);
  } else if (MimeTypes.isVideo(containerMimeType)) {
    return MimeTypes.getVideoMediaMimeType(codecs);
  } else if (MimeTypes.APPLICATION_RAWCC.equals(containerMimeType)) {
    if (codecs != null) {
      if (codecs.contains("cea708")) {
        return MimeTypes.APPLICATION_CEA708;
      } else if (codecs.contains("eia608") || codecs.contains("cea608")) {
        return MimeTypes.APPLICATION_CEA608;
      }
    }
    return null;
  } else if (mimeTypeIsRawText(containerMimeType)) {
    return containerMimeType;
  } else if (MimeTypes.APPLICATION_MP4.equals(containerMimeType)) {
    if ("stpp".equals(codecs)) {
      return MimeTypes.APPLICATION_TTML;
    } else if ("wvtt".equals(codecs)) {
      return MimeTypes.APPLICATION_MP4VTT;
    }
  }
  return null;
}
 

private static void parseTextSampleEntry(ParsableByteArray parent, int atomType, int position,
    int atomSize, int trackId, String language, DrmInitData drmInitData, StsdData out)
    throws ParserException {
  parent.setPosition(position + Atom.HEADER_SIZE + StsdData.STSD_HEADER_SIZE);

  // Default values.
  List<byte[]> initializationData = null;
  long subsampleOffsetUs = Format.OFFSET_SAMPLE_RELATIVE;

  String mimeType;
  if (atomType == Atom.TYPE_TTML) {
    mimeType = MimeTypes.APPLICATION_TTML;
  } else if (atomType == Atom.TYPE_tx3g) {
    mimeType = MimeTypes.APPLICATION_TX3G;
    int sampleDescriptionLength = atomSize - Atom.HEADER_SIZE - 8;
    byte[] sampleDescriptionData = new byte[sampleDescriptionLength];
    parent.readBytes(sampleDescriptionData, 0, sampleDescriptionLength);
    initializationData = Collections.singletonList(sampleDescriptionData);
  } else if (atomType == Atom.TYPE_wvtt) {
    mimeType = MimeTypes.APPLICATION_MP4VTT;
  } else if (atomType == Atom.TYPE_stpp) {
    mimeType = MimeTypes.APPLICATION_TTML;
    subsampleOffsetUs = 0; // Subsample timing is absolute.
  } else if (atomType == Atom.TYPE_c608) {
    // Defined by the QuickTime File Format specification.
    mimeType = MimeTypes.APPLICATION_MP4CEA608;
    out.requiredSampleTransformation = Track.TRANSFORMATION_CEA608_CDAT;
  } else {
    // Never happens.
    throw new IllegalStateException();
  }

  out.format = Format.createTextSampleFormat(Integer.toString(trackId), mimeType, null,
      Format.NO_VALUE, 0, language, Format.NO_VALUE, drmInitData, subsampleOffsetUs,
      initializationData);
}
 

private Class<?> getDecoderClass(String mimeType) {
  if (mimeType == null) {
    return null;
  }
  try {
    switch (mimeType) {
      case MimeTypes.TEXT_VTT:
        return Class.forName("com.google.android.exoplayer2.text.webvtt.WebvttDecoder");
      case MimeTypes.APPLICATION_TTML:
        return Class.forName("com.google.android.exoplayer2.text.ttml.TtmlDecoder");
      case MimeTypes.APPLICATION_MP4VTT:
        return Class.forName("com.google.android.exoplayer2.text.webvtt.Mp4WebvttDecoder");
      case MimeTypes.APPLICATION_SUBRIP:
        return Class.forName("com.google.android.exoplayer2.text.subrip.SubripDecoder");
      case MimeTypes.APPLICATION_TX3G:
        return Class.forName("com.google.android.exoplayer2.text.tx3g.Tx3gDecoder");
      case MimeTypes.APPLICATION_CEA608:
      case MimeTypes.APPLICATION_MP4CEA608:
        return Class.forName("com.google.android.exoplayer2.text.cea.Cea608Decoder");
      case MimeTypes.APPLICATION_CEA708:
        return Class.forName("com.google.android.exoplayer2.text.cea.Cea708Decoder");
      default:
        return null;
    }
  } catch (ClassNotFoundException e) {
    return null;
  }
}