/*
* Copyright 2012 castLabs GmbH, Berlin
*
* 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.
*/
package com.googlecode.mp4parser.authoring.tracks;
import com.googlecode.mp4parser.DataSource;
import com.coremedia.iso.boxes.*;
import com.coremedia.iso.boxes.sampleentry.AudioSampleEntry;
import com.googlecode.mp4parser.authoring.AbstractTrack;
import com.googlecode.mp4parser.authoring.Sample;
import com.googlecode.mp4parser.authoring.SampleImpl;
import com.googlecode.mp4parser.authoring.TrackMetaData;
import com.googlecode.mp4parser.boxes.mp4.ESDescriptorBox;
import com.googlecode.mp4parser.boxes.mp4.objectdescriptors.*;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import java.util.*;
/**
*/
public class AACTrackImpl extends AbstractTrack {
static Map<Integer, String> audioObjectTypes = new HashMap<Integer, String>();
static {
audioObjectTypes.put(1, "AAC Main");
audioObjectTypes.put(2, "AAC LC (Low Complexity)");
audioObjectTypes.put(3, "AAC SSR (Scalable Sample Rate)");
audioObjectTypes.put(4, "AAC LTP (Long Term Prediction)");
audioObjectTypes.put(5, "SBR (Spectral Band Replication)");
audioObjectTypes.put(6, "AAC Scalable");
audioObjectTypes.put(7, "TwinVQ");
audioObjectTypes.put(8, "CELP (Code Excited Linear Prediction)");
audioObjectTypes.put(9, "HXVC (Harmonic Vector eXcitation Coding)");
audioObjectTypes.put(10, "Reserved");
audioObjectTypes.put(11, "Reserved");
audioObjectTypes.put(12, "TTSI (Text-To-Speech Interface)");
audioObjectTypes.put(13, "Main Synthesis");
audioObjectTypes.put(14, "Wavetable Synthesis");
audioObjectTypes.put(15, "General MIDI");
audioObjectTypes.put(16, "Algorithmic Synthesis and Audio Effects");
audioObjectTypes.put(17, "ER (Error Resilient) AAC LC");
audioObjectTypes.put(18, "Reserved");
audioObjectTypes.put(19, "ER AAC LTP");
audioObjectTypes.put(20, "ER AAC Scalable");
audioObjectTypes.put(21, "ER TwinVQ");
audioObjectTypes.put(22, "ER BSAC (Bit-Sliced Arithmetic Coding)");
audioObjectTypes.put(23, "ER AAC LD (Low Delay)");
audioObjectTypes.put(24, "ER CELP");
audioObjectTypes.put(25, "ER HVXC");
audioObjectTypes.put(26, "ER HILN (Harmonic and Individual Lines plus Noise)");
audioObjectTypes.put(27, "ER Parametric");
audioObjectTypes.put(28, "SSC (SinuSoidal Coding)");
audioObjectTypes.put(29, "PS (Parametric Stereo)");
audioObjectTypes.put(30, "MPEG Surround");
audioObjectTypes.put(31, "(Escape value)");
audioObjectTypes.put(32, "Layer-1");
audioObjectTypes.put(33, "Layer-2");
audioObjectTypes.put(34, "Layer-3");
audioObjectTypes.put(35, "DST (Direct Stream Transfer)");
audioObjectTypes.put(36, "ALS (Audio Lossless)");
audioObjectTypes.put(37, "SLS (Scalable LosslesS)");
audioObjectTypes.put(38, "SLS non-core");
audioObjectTypes.put(39, "ER AAC ELD (Enhanced Low Delay)");
audioObjectTypes.put(40, "SMR (Symbolic Music Representation) Simple");
audioObjectTypes.put(41, "SMR Main");
audioObjectTypes.put(42, "USAC (Unified Speech and Audio Coding) (no SBR)");
audioObjectTypes.put(43, "SAOC (Spatial Audio Object Coding)");
audioObjectTypes.put(44, "LD MPEG Surround");
audioObjectTypes.put(45, "USAC");
}
public static Map<Integer, Integer> samplingFrequencyIndexMap = new HashMap<Integer, Integer>();
static {
samplingFrequencyIndexMap.put(96000, 0);
samplingFrequencyIndexMap.put(88200, 1);
samplingFrequencyIndexMap.put(64000, 2);
samplingFrequencyIndexMap.put(48000, 3);
samplingFrequencyIndexMap.put(44100, 4);
samplingFrequencyIndexMap.put(32000, 5);
samplingFrequencyIndexMap.put(24000, 6);
samplingFrequencyIndexMap.put(22050, 7);
samplingFrequencyIndexMap.put(16000, 8);
samplingFrequencyIndexMap.put(12000, 9);
samplingFrequencyIndexMap.put(11025, 10);
samplingFrequencyIndexMap.put(8000, 11);
samplingFrequencyIndexMap.put(0x0, 96000);
samplingFrequencyIndexMap.put(0x1, 88200);
samplingFrequencyIndexMap.put(0x2, 64000);
samplingFrequencyIndexMap.put(0x3, 48000);
samplingFrequencyIndexMap.put(0x4, 44100);
samplingFrequencyIndexMap.put(0x5, 32000);
samplingFrequencyIndexMap.put(0x6, 24000);
samplingFrequencyIndexMap.put(0x7, 22050);
samplingFrequencyIndexMap.put(0x8, 16000);
samplingFrequencyIndexMap.put(0x9, 12000);
samplingFrequencyIndexMap.put(0xa, 11025);
samplingFrequencyIndexMap.put(0xb, 8000);
}
TrackMetaData trackMetaData = new TrackMetaData();
SampleDescriptionBox sampleDescriptionBox;
long[] decTimes;
AdtsHeader firstHeader;
int bufferSizeDB;
long maxBitRate;
long avgBitRate;
private DataSource dataSource;
private List<Sample> samples;
private String lang = "eng";
public void close() throws IOException {
// doing everything to get rid of references to memory mapped things
dataSource.close();
}
public AACTrackImpl(DataSource dataSource) throws IOException {
this(dataSource, "eng");
}
public AACTrackImpl(DataSource dataSource, String lang) throws IOException {
this.lang = lang;
this.dataSource = dataSource;
samples = new ArrayList<Sample>();
firstHeader = readSamples(dataSource);
double packetsPerSecond = (double) firstHeader.sampleRate / 1024.0;
double duration = samples.size() / packetsPerSecond;
long dataSize = 0;
LinkedList<Integer> queue = new LinkedList<Integer>();
for (Sample sample : samples) {
int size = (int) sample.getSize();
dataSize += size;
queue.add(size);
while (queue.size() > packetsPerSecond) {
queue.pop();
}
if (queue.size() == (int) packetsPerSecond) {
int currSize = 0;
for (Integer aQueue : queue) {
currSize += aQueue;
}
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");
if (firstHeader.channelconfig == 7) {
audioSampleEntry.setChannelCount(8);
} else {
audioSampleEntry.setChannelCount(firstHeader.channelconfig);
}
audioSampleEntry.setSampleRate(firstHeader.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(firstHeader.sampleFrequencyIndex);
audioSpecificConfig.setChannelConfiguration(firstHeader.channelconfig);
decoderConfigDescriptor.setAudioSpecificInfo(audioSpecificConfig);
descriptor.setDecoderConfigDescriptor(decoderConfigDescriptor);
ByteBuffer data = descriptor.serialize();
esds.setEsDescriptor(descriptor);
esds.setData(data);
audioSampleEntry.addBox(esds);
sampleDescriptionBox.addBox(audioSampleEntry);
trackMetaData.setCreationTime(new Date());
trackMetaData.setModificationTime(new Date());
trackMetaData.setLanguage(lang);
trackMetaData.setVolume(1);
trackMetaData.setTimescale(firstHeader.sampleRate); // Audio tracks always use sampleRate as timescale
decTimes = new long[samples.size()];
Arrays.fill(decTimes, 1024);
}
public SampleDescriptionBox getSampleDescriptionBox() {
return sampleDescriptionBox;
}
public long[] getSampleDurations() {
return decTimes;
}
public List<CompositionTimeToSample.Entry> getCompositionTimeEntries() {
return null;
}
public long[] getSyncSamples() {
return null;
}
public List<SampleDependencyTypeBox.Entry> getSampleDependencies() {
return null;
}
public TrackMetaData getTrackMetaData() {
return trackMetaData;
}
public String getHandler() {
return "soun";
}
public List<Sample> getSamples() {
return samples;
}
public Box getMediaHeaderBox() {
return new SoundMediaHeaderBox();
}
public SubSampleInformationBox getSubsampleInformationBox() {
return null;
}
class AdtsHeader {
int getSize() {
return 7 + (protectionAbsent == 0 ? 2 : 0);
}
int sampleFrequencyIndex;
int mpegVersion;
int layer;
int protectionAbsent;
int profile;
int sampleRate;
int channelconfig;
int original;
int home;
int copyrightedStream;
int copyrightStart;
int frameLength;
int bufferFullness;
int numAacFramesPerAdtsFrame;
}
private AdtsHeader readADTSHeader(DataSource channel) throws IOException {
AdtsHeader hdr = new AdtsHeader();
ByteBuffer bb = ByteBuffer.allocate(7);
while (bb.position() < 7) {
if (channel.read(bb) == -1) {
return null;
}
}
BitReaderBuffer brb = new BitReaderBuffer((ByteBuffer) bb.rewind());
int syncword = brb.readBits(12); // A
if (syncword != 0xfff) {
throw new IOException("Expected Start Word 0xfff");
}
hdr.mpegVersion = brb.readBits(1); // B
hdr.layer = brb.readBits(2); // C
hdr.protectionAbsent = brb.readBits(1); // D
hdr.profile = brb.readBits(2) + 1; // E
//System.err.println(String.format("Profile %s", audioObjectTypes.get(hdr.profile)));
hdr.sampleFrequencyIndex = brb.readBits(4);
hdr.sampleRate = samplingFrequencyIndexMap.get(hdr.sampleFrequencyIndex); // F
brb.readBits(1); // G
hdr.channelconfig = brb.readBits(3); // H
hdr.original = brb.readBits(1); // I
hdr.home = brb.readBits(1); // J
hdr.copyrightedStream = brb.readBits(1); // K
hdr.copyrightStart = brb.readBits(1); // L
hdr.frameLength = brb.readBits(13); // M
//System.err.println(hdr.frameLength);
hdr.bufferFullness = brb.readBits(11); // 54
hdr.numAacFramesPerAdtsFrame = brb.readBits(2) + 1; // 56
if (hdr.numAacFramesPerAdtsFrame != 1) {
throw new IOException("This muxer can only work with 1 AAC frame per ADTS frame");
}
if (hdr.protectionAbsent == 0) {
channel.read(ByteBuffer.allocate(2));
}
return hdr;
}
private AdtsHeader readSamples(DataSource channel) throws IOException {
AdtsHeader first = null;
AdtsHeader hdr;
while ((hdr = readADTSHeader(channel)) != null) {
if (first == null) {
first = hdr;
}
final long currentPosition = channel.position();
final long frameSize = hdr.frameLength - hdr.getSize();
samples.add(new Sample() {
public void writeTo(WritableByteChannel channel) throws IOException {
dataSource.transferTo(currentPosition, frameSize, channel);
}
public long getSize() {
return frameSize;
}
public ByteBuffer asByteBuffer() {
try {
return dataSource.map(currentPosition, frameSize);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
});
channel.position(channel.position() + hdr.frameLength - hdr.getSize());
}
return first;
}
@Override
public String toString() {
return "AACTrackImpl{" +
"sampleRate=" + firstHeader.sampleRate +
", channelconfig=" + firstHeader.channelconfig +
'}';
}
}