/** Parses a sidx atom (defined in 14496-12). */
private static ChunkIndex parseSidx(ParsableByteArray atom, long inputPosition)
throws ParserException {
atom.setPosition(Atom.HEADER_SIZE);
int fullAtom = atom.readInt();
int version = Atom.parseFullAtomVersion(fullAtom);
atom.skipBytes(4);
long timescale = atom.readUnsignedInt();
long earliestPresentationTime;
long offset = inputPosition;
if (version == 0) {
earliestPresentationTime = atom.readUnsignedInt();
offset += atom.readUnsignedInt();
} else {
earliestPresentationTime = atom.readUnsignedLongToLong();
offset += atom.readUnsignedLongToLong();
}
atom.skipBytes(2);
int referenceCount = atom.readUnsignedShort();
int[] sizes = new int[referenceCount];
long[] offsets = new long[referenceCount];
long[] durationsUs = new long[referenceCount];
long[] timesUs = new long[referenceCount];
long time = earliestPresentationTime;
long timeUs = Util.scaleLargeTimestamp(time, C.MICROS_PER_SECOND, timescale);
for (int i = 0; i < referenceCount; i++) {
int firstInt = atom.readInt();
int type = 0x80000000 & firstInt;
if (type != 0) {
throw new ParserException("Unhandled indirect reference");
}
long referenceDuration = atom.readUnsignedInt();
sizes[i] = 0x7fffffff & firstInt;
offsets[i] = offset;
// Calculate time and duration values such that any rounding errors are consistent. i.e. That
// timesUs[i] + durationsUs[i] == timesUs[i + 1].
timesUs[i] = timeUs;
time += referenceDuration;
timeUs = Util.scaleLargeTimestamp(time, C.MICROS_PER_SECOND, timescale);
durationsUs[i] = timeUs - timesUs[i];
atom.skipBytes(4);
offset += sizes[i];
}
return new ChunkIndex(sizes, offsets, durationsUs, timesUs);
}
private static void parseSaiz(
TrackEncryptionBox encryptionBox, ParsableByteArray saiz, TrackFragment out)
throws ParserException {
int vectorSize = encryptionBox.initializationVectorSize;
saiz.setPosition(Atom.HEADER_SIZE);
int fullAtom = saiz.readInt();
int flags = Atom.parseFullAtomFlags(fullAtom);
if ((flags & 0x01) == 1) {
saiz.skipBytes(8);
}
int defaultSampleInfoSize = saiz.readUnsignedByte();
int sampleCount = saiz.readUnsignedIntToInt();
if (sampleCount != out.length) {
throw new ParserException("Length mismatch: " + sampleCount + ", " + out.length);
}
int totalSize = 0;
if (defaultSampleInfoSize == 0) {
boolean[] sampleHasSubsampleEncryptionTable = out.sampleHasSubsampleEncryptionTable;
for (int i = 0; i < sampleCount; i++) {
int sampleInfoSize = saiz.readUnsignedByte();
totalSize += sampleInfoSize;
sampleHasSubsampleEncryptionTable[i] = sampleInfoSize > vectorSize;
}
} else {
boolean subsampleEncryption = defaultSampleInfoSize > vectorSize;
totalSize += defaultSampleInfoSize * sampleCount;
Arrays.fill(out.sampleHasSubsampleEncryptionTable, 0, sampleCount, subsampleEncryption);
}
out.initEncryptionData(totalSize);
}
/**
* Parses a saio atom (defined in 14496-12).
*
* @param saio The saio atom to parse.
* @param out The track fragment to populate with data from the saio atom.
*/
private static void parseSaio(ParsableByteArray saio, TrackFragment out) throws ParserException {
saio.setPosition(Atom.HEADER_SIZE);
int fullAtom = saio.readInt();
int flags = Atom.parseFullAtomFlags(fullAtom);
if ((flags & 0x01) == 1) {
saio.skipBytes(8);
}
int entryCount = saio.readUnsignedIntToInt();
if (entryCount != 1) {
// We only support one trun element currently, so always expect one entry.
throw new ParserException("Unexpected saio entry count: " + entryCount);
}
int version = Atom.parseFullAtomVersion(fullAtom);
out.auxiliaryDataPosition +=
version == 0 ? saio.readUnsignedInt() : saio.readUnsignedLongToLong();
}
private int appendSampleEncryptionData(ParsableByteArray sampleEncryptionData) {
int sampleDescriptionIndex = fragmentRun.header.sampleDescriptionIndex;
TrackEncryptionBox encryptionBox =
track.sampleDescriptionEncryptionBoxes[sampleDescriptionIndex];
int vectorSize = encryptionBox.initializationVectorSize;
boolean subsampleEncryption = fragmentRun.sampleHasSubsampleEncryptionTable[sampleIndex];
// Write the signal byte, containing the vector size and the subsample encryption flag.
encryptionSignalByte.data[0] = (byte) (vectorSize | (subsampleEncryption ? 0x80 : 0));
encryptionSignalByte.setPosition(0);
trackOutput.sampleData(encryptionSignalByte, 1);
// Write the vector.
trackOutput.sampleData(sampleEncryptionData, vectorSize);
// If we don't have subsample encryption data, we're done.
if (!subsampleEncryption) {
return 1 + vectorSize;
}
// Write the subsample encryption data.
int subsampleCount = sampleEncryptionData.readUnsignedShort();
sampleEncryptionData.skipBytes(-2);
int subsampleDataLength = 2 + 6 * subsampleCount;
trackOutput.sampleData(sampleEncryptionData, subsampleDataLength);
return 1 + vectorSize + subsampleDataLength;
}
/**
* Parses a tfhd atom (defined in 14496-12).
*
* @param extendsDefaults Default sample values from the trex atom.
* @param tfhd The tfhd atom to parse.
* @param out The track fragment to populate with data from the tfhd atom.
*/
private static void parseTfhd(
DefaultSampleValues extendsDefaults, ParsableByteArray tfhd, TrackFragment out) {
tfhd.setPosition(Atom.HEADER_SIZE);
int fullAtom = tfhd.readInt();
int flags = Atom.parseFullAtomFlags(fullAtom);
tfhd.skipBytes(4); // trackId
if ((flags & 0x01 /* base_data_offset_present */) != 0) {
long baseDataPosition = tfhd.readUnsignedLongToLong();
out.dataPosition = baseDataPosition;
out.auxiliaryDataPosition = baseDataPosition;
}
int defaultSampleDescriptionIndex =
((flags & 0x02 /* default_sample_description_index_present */) != 0)
? tfhd.readUnsignedIntToInt() - 1
: extendsDefaults.sampleDescriptionIndex;
int defaultSampleDuration =
((flags & 0x08 /* default_sample_duration_present */) != 0)
? tfhd.readUnsignedIntToInt()
: extendsDefaults.duration;
int defaultSampleSize =
((flags & 0x10 /* default_sample_size_present */) != 0)
? tfhd.readUnsignedIntToInt()
: extendsDefaults.size;
int defaultSampleFlags =
((flags & 0x20 /* default_sample_flags_present */) != 0)
? tfhd.readUnsignedIntToInt()
: extendsDefaults.flags;
out.header =
new DefaultSampleValues(
defaultSampleDescriptionIndex,
defaultSampleDuration,
defaultSampleSize,
defaultSampleFlags);
}
