| Methods Summary |
|---|
| public java.util.List | getCompositionTimeEntries()
return null;
|
| public java.util.List | getDecodingTimeEntries()
return stts;
|
| public java.lang.String | getHandler()
return "soun";
|
| public Box | getMediaHeaderBox()
return new SoundMediaHeaderBox();
|
| public java.util.List | getSampleDependencies()
return null;
|
| public SampleDescriptionBox | getSampleDescriptionBox()
return sampleDescriptionBox;
|
| public java.util.List | getSamples()
return samples;
|
| public SubSampleInformationBox | getSubsampleInformationBox()
return null;
|
| public long[] | getSyncSamples()
return null;
|
| public com.googlecode.mp4parser.authoring.TrackMetaData | getTrackMetaData()
return trackMetaData;
|
| private void | parse(java.io.InputStream inputStream)
this.inputStream = new BufferedInputStream(inputStream);
stts = new LinkedList<TimeToSampleBox.Entry>();
if (!readVariables()) {
throw new IOException();
}
samples = new LinkedList<ByteBuffer>();
if (!readSamples()) {
throw new IOException();
}
double packetsPerSecond = (double)samplerate / 1024.0;
double duration = samples.size() / packetsPerSecond;
long dataSize = 0;
LinkedList<Integer> queue = new LinkedList<Integer>();
for (int i = 0; i < samples.size(); i++) {
int size = samples.get(i).capacity();
dataSize += size;
queue.add(size);
while (queue.size() > packetsPerSecond) {
queue.pop();
}
if (queue.size() == (int) packetsPerSecond) {
int currSize = 0;
for (int j = 0 ; j < queue.size(); j++) {
currSize += queue.get(j);
}
double currBitrate = 8.0 * currSize / queue.size() * packetsPerSecond;
if (currBitrate > maxBitRate) {
maxBitRate = (int)currBitrate;
}
}
}
avgBitRate = (int) (8 * dataSize / duration);
bufferSizeDB = 1536; /* TODO: Calcultate this somehow! */
sampleDescriptionBox = new SampleDescriptionBox();
AudioSampleEntry audioSampleEntry = new AudioSampleEntry("mp4a");
audioSampleEntry.setChannelCount(2);
audioSampleEntry.setSampleRate(samplerate);
audioSampleEntry.setDataReferenceIndex(1);
audioSampleEntry.setSampleSize(16);
ESDescriptorBox esds = new ESDescriptorBox();
ESDescriptor descriptor = new ESDescriptor();
descriptor.setEsId(0);
SLConfigDescriptor slConfigDescriptor = new SLConfigDescriptor();
slConfigDescriptor.setPredefined(2);
descriptor.setSlConfigDescriptor(slConfigDescriptor);
DecoderConfigDescriptor decoderConfigDescriptor = new DecoderConfigDescriptor();
decoderConfigDescriptor.setObjectTypeIndication(0x40);
decoderConfigDescriptor.setStreamType(5);
decoderConfigDescriptor.setBufferSizeDB(bufferSizeDB);
decoderConfigDescriptor.setMaxBitRate(maxBitRate);
decoderConfigDescriptor.setAvgBitRate(avgBitRate);
AudioSpecificConfig audioSpecificConfig = new AudioSpecificConfig();
audioSpecificConfig.setAudioObjectType(2); // AAC LC
audioSpecificConfig.setSamplingFrequencyIndex(samplingFrequencyIndexMap.get(samplerate));
audioSpecificConfig.setChannelConfiguration(channelconfig);
decoderConfigDescriptor.setAudioSpecificInfo(audioSpecificConfig);
descriptor.setDecoderConfigDescriptor(decoderConfigDescriptor);
ByteBuffer data = descriptor.serialize();
esds.setData(data);
audioSampleEntry.addBox(esds);
sampleDescriptionBox.addBox(audioSampleEntry);
trackMetaData.setCreationTime(new Date());
trackMetaData.setModificationTime(new Date());
trackMetaData.setLanguage(lang);
trackMetaData.setTimescale(samplerate); // Audio tracks always use samplerate as timescale
|
| private boolean | readSamples()
if (readSamples) {
return true;
}
readSamples = true;
byte[] header = new byte[15];
boolean ret = false;
inputStream.mark(15);
while (-1 != inputStream.read(header)) {
ret = true;
ByteBuffer bb = ByteBuffer.wrap(header);
inputStream.reset();
BitReaderBuffer brb = new BitReaderBuffer(bb);
int syncword = brb.readBits(12);
if (syncword != 0xfff) {
return false;
}
brb.readBits(3);
int protectionAbsent = brb.readBits(1);
brb.readBits(14);
int frameSize = brb.readBits(13);
int bufferFullness = brb.readBits(11);
int noBlocks = brb.readBits(2);
int used = (int) Math.ceil(brb.getPosition() / 8.0);
if (protectionAbsent == 0) {
used += 2;
}
inputStream.skip(used);
frameSize -= used;
// System.out.println("Size: " + frameSize + " fullness: " + bufferFullness + " no blocks: " + noBlocks);
byte[] data = new byte[frameSize];
inputStream.read(data);
samples.add(ByteBuffer.wrap(data));
stts.add(new TimeToSampleBox.Entry(1, 1024));
inputStream.mark(15);
}
return ret;
|
| private boolean | readVariables()
byte[] data = new byte[100];
inputStream.mark(100);
if (100 != inputStream.read(data, 0, 100)) {
return false;
}
inputStream.reset(); // Rewind
ByteBuffer bb = ByteBuffer.wrap(data);
BitReaderBuffer brb = new BitReaderBuffer(bb);
int syncword = brb.readBits(12);
if (syncword != 0xfff) {
return false;
}
int id = brb.readBits(1);
int layer = brb.readBits(2);
int protectionAbsent = brb.readBits(1);
int profile = brb.readBits(2);
samplerate = samplingFrequencyIndexMap.get(brb.readBits(4));
brb.readBits(1);
channelconfig = brb.readBits(3);
int original = brb.readBits(1);
int home = brb.readBits(1);
int emphasis = brb.readBits(2);
return true;
|
| public java.lang.String | toString()
return "AACTrackImpl{" +
"samplerate=" + samplerate +
", bitrate=" + bitrate +
", channelCount=" + channelCount +
", channelconfig=" + channelconfig +
'}";
|
