package com.googlecode.mp4parser.authoring.tracks;
import com.coremedia.iso.boxes.*;
import com.coremedia.iso.boxes.sampleentry.AudioSampleEntry;
import com.googlecode.mp4parser.authoring.AbstractTrack;
import com.googlecode.mp4parser.authoring.TrackMetaData;
import com.googlecode.mp4parser.boxes.AC3SpecificBox;
import com.googlecode.mp4parser.boxes.mp4.objectdescriptors.BitReaderBuffer;
import java.io.InputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
public class AC3TrackImpl extends AbstractTrack {
TrackMetaData trackMetaData = new TrackMetaData();
SampleDescriptionBox sampleDescriptionBox;
int samplerate;
int bitrate;
int channelCount;
int fscod;
int bsid;
int bsmod;
int acmod;
int lfeon;
int frmsizecod;
int frameSize;
int[][][][] bitRateAndFrameSizeTable;
private InputStream inputStream;
private List<ByteBuffer> samples;
boolean readSamples = false;
List<TimeToSampleBox.Entry> stts;
private String lang = "und";
public AC3TrackImpl(InputStream fin, String lang) throws IOException {
this.lang = lang;
parse(fin);
}
public AC3TrackImpl(InputStream fin) throws IOException {
parse(fin);
}
private void parse(InputStream fin) throws IOException {
inputStream = fin;
bitRateAndFrameSizeTable = new int[19][2][3][2];
stts = new LinkedList<TimeToSampleBox.Entry>();
initBitRateAndFrameSizeTable();
if (!readVariables()) {
throw new IOException();
}
sampleDescriptionBox = new SampleDescriptionBox();
AudioSampleEntry audioSampleEntry = new AudioSampleEntry("ac-3");
audioSampleEntry.setChannelCount(2); // According to ETSI TS 102 366 Annex F
audioSampleEntry.setSampleRate(samplerate);
audioSampleEntry.setDataReferenceIndex(1);
audioSampleEntry.setSampleSize(16);
AC3SpecificBox ac3 = new AC3SpecificBox();
ac3.setAcmod(acmod);
ac3.setBitRateCode(frmsizecod >> 1);
ac3.setBsid(bsid);
ac3.setBsmod(bsmod);
ac3.setFscod(fscod);
ac3.setLfeon(lfeon);
ac3.setReserved(0);
audioSampleEntry.addBox(ac3);
sampleDescriptionBox.addBox(audioSampleEntry);
trackMetaData.setCreationTime(new Date());
trackMetaData.setModificationTime(new Date());
trackMetaData.setLanguage(lang);
trackMetaData.setTimescale(samplerate); // Audio tracks always use samplerate as timescale
samples = new LinkedList<ByteBuffer>();
if (!readSamples()) {
throw new IOException();
}
}
public List<ByteBuffer> getSamples() {
return samples;
}
public SampleDescriptionBox getSampleDescriptionBox() {
return sampleDescriptionBox;
}
public List<TimeToSampleBox.Entry> getDecodingTimeEntries() {
return stts;
}
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 Box getMediaHeaderBox() {
return new SoundMediaHeaderBox();
}
public SubSampleInformationBox getSubsampleInformationBox() {
return null;
}
private boolean readVariables() throws IOException {
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(16);
if (syncword != 0xb77) {
return false;
}
brb.readBits(16); // CRC-1
fscod = brb.readBits(2);
switch (fscod) {
case 0:
samplerate = 48000;
break;
case 1:
samplerate = 44100;
break;
case 2:
samplerate = 32000;
break;
case 3:
samplerate = 0;
break;
}
if (samplerate == 0) {
return false;
}
frmsizecod = brb.readBits(6);
if (!calcBitrateAndFrameSize(frmsizecod)) {
return false;
}
if (frameSize == 0) {
return false;
}
bsid = brb.readBits(5);
bsmod = brb.readBits(3);
acmod = brb.readBits(3);
if (bsid == 9) {
samplerate /= 2;
} else if (bsid != 8 && bsid != 6) {
return false;
}
if ((acmod != 1) && ((acmod & 1) == 1)) {
brb.readBits(2);
}
if (0 != (acmod & 4)) {
brb.readBits(2);
}
if (acmod == 2) {
brb.readBits(2);
}
switch (acmod) {
case 0:
channelCount = 2;
break;
case 1:
channelCount = 1;
break;
case 2:
channelCount = 2;
break;
case 3:
channelCount = 3;
break;
case 4:
channelCount = 3;
break;
case 5:
channelCount = 4;
break;
case 6:
channelCount = 4;
break;
case 7:
channelCount = 5;
break;
}
lfeon = brb.readBits(1);
if (lfeon == 1) {
channelCount++;
}
return true;
}
private boolean calcBitrateAndFrameSize(int code) {
int frmsizecode = code >>> 1;
int flag = code & 1;
if (frmsizecode > 18 || flag > 1 || fscod > 2) {
return false;
}
bitrate = bitRateAndFrameSizeTable[frmsizecode][flag][fscod][0];
frameSize = 2 * bitRateAndFrameSizeTable[frmsizecode][flag][fscod][1];
return true;
}
private boolean readSamples() throws IOException {
if (readSamples) {
return true;
}
readSamples = true;
byte[] header = new byte[5];
boolean ret = false;
inputStream.mark(5);
while (-1 != inputStream.read(header)) {
ret = true;
int frmsizecode = header[4] & 63;
calcBitrateAndFrameSize(frmsizecode);
inputStream.reset();
byte[] data = new byte[frameSize];
inputStream.read(data);
samples.add(ByteBuffer.wrap(data));
stts.add(new TimeToSampleBox.Entry(1, 1536));
inputStream.mark(5);
}
return ret;
}
private void initBitRateAndFrameSizeTable() {
// ETSI 102 366 Table 4.13, in frmsizecod, flag, fscod, bitrate/size order. Note that all sizes are in words, and all bitrates in kbps
// 48kHz
bitRateAndFrameSizeTable[0][0][0][0] = 32;
bitRateAndFrameSizeTable[0][1][0][0] = 32;
bitRateAndFrameSizeTable[0][0][0][1] = 64;
bitRateAndFrameSizeTable[0][1][0][1] = 64;
bitRateAndFrameSizeTable[1][0][0][0] = 40;
bitRateAndFrameSizeTable[1][1][0][0] = 40;
bitRateAndFrameSizeTable[1][0][0][1] = 80;
bitRateAndFrameSizeTable[1][1][0][1] = 80;
bitRateAndFrameSizeTable[2][0][0][0] = 48;
bitRateAndFrameSizeTable[2][1][0][0] = 48;
bitRateAndFrameSizeTable[2][0][0][1] = 96;
bitRateAndFrameSizeTable[2][1][0][1] = 96;
bitRateAndFrameSizeTable[3][0][0][0] = 56;
bitRateAndFrameSizeTable[3][1][0][0] = 56;
bitRateAndFrameSizeTable[3][0][0][1] = 112;
bitRateAndFrameSizeTable[3][1][0][1] = 112;
bitRateAndFrameSizeTable[4][0][0][0] = 64;
bitRateAndFrameSizeTable[4][1][0][0] = 64;
bitRateAndFrameSizeTable[4][0][0][1] = 128;
bitRateAndFrameSizeTable[4][1][0][1] = 128;
bitRateAndFrameSizeTable[5][0][0][0] = 80;
bitRateAndFrameSizeTable[5][1][0][0] = 80;
bitRateAndFrameSizeTable[5][0][0][1] = 160;
bitRateAndFrameSizeTable[5][1][0][1] = 160;
bitRateAndFrameSizeTable[6][0][0][0] = 96;
bitRateAndFrameSizeTable[6][1][0][0] = 96;
bitRateAndFrameSizeTable[6][0][0][1] = 192;
bitRateAndFrameSizeTable[6][1][0][1] = 192;
bitRateAndFrameSizeTable[7][0][0][0] = 112;
bitRateAndFrameSizeTable[7][1][0][0] = 112;
bitRateAndFrameSizeTable[7][0][0][1] = 224;
bitRateAndFrameSizeTable[7][1][0][1] = 224;
bitRateAndFrameSizeTable[8][0][0][0] = 128;
bitRateAndFrameSizeTable[8][1][0][0] = 128;
bitRateAndFrameSizeTable[8][0][0][1] = 256;
bitRateAndFrameSizeTable[8][1][0][1] = 256;
bitRateAndFrameSizeTable[9][0][0][0] = 160;
bitRateAndFrameSizeTable[9][1][0][0] = 160;
bitRateAndFrameSizeTable[9][0][0][1] = 320;
bitRateAndFrameSizeTable[9][1][0][1] = 320;
bitRateAndFrameSizeTable[10][0][0][0] = 192;
bitRateAndFrameSizeTable[10][1][0][0] = 192;
bitRateAndFrameSizeTable[10][0][0][1] = 384;
bitRateAndFrameSizeTable[10][1][0][1] = 384;
bitRateAndFrameSizeTable[11][0][0][0] = 224;
bitRateAndFrameSizeTable[11][1][0][0] = 224;
bitRateAndFrameSizeTable[11][0][0][1] = 448;
bitRateAndFrameSizeTable[11][1][0][1] = 448;
bitRateAndFrameSizeTable[12][0][0][0] = 256;
bitRateAndFrameSizeTable[12][1][0][0] = 256;
bitRateAndFrameSizeTable[12][0][0][1] = 512;
bitRateAndFrameSizeTable[12][1][0][1] = 512;
bitRateAndFrameSizeTable[13][0][0][0] = 320;
bitRateAndFrameSizeTable[13][1][0][0] = 320;
bitRateAndFrameSizeTable[13][0][0][1] = 640;
bitRateAndFrameSizeTable[13][1][0][1] = 640;
bitRateAndFrameSizeTable[14][0][0][0] = 384;
bitRateAndFrameSizeTable[14][1][0][0] = 384;
bitRateAndFrameSizeTable[14][0][0][1] = 768;
bitRateAndFrameSizeTable[14][1][0][1] = 768;
bitRateAndFrameSizeTable[15][0][0][0] = 448;
bitRateAndFrameSizeTable[15][1][0][0] = 448;
bitRateAndFrameSizeTable[15][0][0][1] = 896;
bitRateAndFrameSizeTable[15][1][0][1] = 896;
bitRateAndFrameSizeTable[16][0][0][0] = 512;
bitRateAndFrameSizeTable[16][1][0][0] = 512;
bitRateAndFrameSizeTable[16][0][0][1] = 1024;
bitRateAndFrameSizeTable[16][1][0][1] = 1024;
bitRateAndFrameSizeTable[17][0][0][0] = 576;
bitRateAndFrameSizeTable[17][1][0][0] = 576;
bitRateAndFrameSizeTable[17][0][0][1] = 1152;
bitRateAndFrameSizeTable[17][1][0][1] = 1152;
bitRateAndFrameSizeTable[18][0][0][0] = 640;
bitRateAndFrameSizeTable[18][1][0][0] = 640;
bitRateAndFrameSizeTable[18][0][0][1] = 1280;
bitRateAndFrameSizeTable[18][1][0][1] = 1280;
// 44.1 kHz
bitRateAndFrameSizeTable[0][0][1][0] = 32;
bitRateAndFrameSizeTable[0][1][1][0] = 32;
bitRateAndFrameSizeTable[0][0][1][1] = 69;
bitRateAndFrameSizeTable[0][1][1][1] = 70;
bitRateAndFrameSizeTable[1][0][1][0] = 40;
bitRateAndFrameSizeTable[1][1][1][0] = 40;
bitRateAndFrameSizeTable[1][0][1][1] = 87;
bitRateAndFrameSizeTable[1][1][1][1] = 88;
bitRateAndFrameSizeTable[2][0][1][0] = 48;
bitRateAndFrameSizeTable[2][1][1][0] = 48;
bitRateAndFrameSizeTable[2][0][1][1] = 104;
bitRateAndFrameSizeTable[2][1][1][1] = 105;
bitRateAndFrameSizeTable[3][0][1][0] = 56;
bitRateAndFrameSizeTable[3][1][1][0] = 56;
bitRateAndFrameSizeTable[3][0][1][1] = 121;
bitRateAndFrameSizeTable[3][1][1][1] = 122;
bitRateAndFrameSizeTable[4][0][1][0] = 64;
bitRateAndFrameSizeTable[4][1][1][0] = 64;
bitRateAndFrameSizeTable[4][0][1][1] = 139;
bitRateAndFrameSizeTable[4][1][1][1] = 140;
bitRateAndFrameSizeTable[5][0][1][0] = 80;
bitRateAndFrameSizeTable[5][1][1][0] = 80;
bitRateAndFrameSizeTable[5][0][1][1] = 174;
bitRateAndFrameSizeTable[5][1][1][1] = 175;
bitRateAndFrameSizeTable[6][0][1][0] = 96;
bitRateAndFrameSizeTable[6][1][1][0] = 96;
bitRateAndFrameSizeTable[6][0][1][1] = 208;
bitRateAndFrameSizeTable[6][1][1][1] = 209;
bitRateAndFrameSizeTable[7][0][1][0] = 112;
bitRateAndFrameSizeTable[7][1][1][0] = 112;
bitRateAndFrameSizeTable[7][0][1][1] = 243;
bitRateAndFrameSizeTable[7][1][1][1] = 244;
bitRateAndFrameSizeTable[8][0][1][0] = 128;
bitRateAndFrameSizeTable[8][1][1][0] = 128;
bitRateAndFrameSizeTable[8][0][1][1] = 278;
bitRateAndFrameSizeTable[8][1][1][1] = 279;
bitRateAndFrameSizeTable[9][0][1][0] = 160;
bitRateAndFrameSizeTable[9][1][1][0] = 160;
bitRateAndFrameSizeTable[9][0][1][1] = 348;
bitRateAndFrameSizeTable[9][1][1][1] = 349;
bitRateAndFrameSizeTable[10][0][1][0] = 192;
bitRateAndFrameSizeTable[10][1][1][0] = 192;
bitRateAndFrameSizeTable[10][0][1][1] = 417;
bitRateAndFrameSizeTable[10][1][1][1] = 418;
bitRateAndFrameSizeTable[11][0][1][0] = 224;
bitRateAndFrameSizeTable[11][1][1][0] = 224;
bitRateAndFrameSizeTable[11][0][1][1] = 487;
bitRateAndFrameSizeTable[11][1][1][1] = 488;
bitRateAndFrameSizeTable[12][0][1][0] = 256;
bitRateAndFrameSizeTable[12][1][1][0] = 256;
bitRateAndFrameSizeTable[12][0][1][1] = 557;
bitRateAndFrameSizeTable[12][1][1][1] = 558;
bitRateAndFrameSizeTable[13][0][1][0] = 320;
bitRateAndFrameSizeTable[13][1][1][0] = 320;
bitRateAndFrameSizeTable[13][0][1][1] = 696;
bitRateAndFrameSizeTable[13][1][1][1] = 697;
bitRateAndFrameSizeTable[14][0][1][0] = 384;
bitRateAndFrameSizeTable[14][1][1][0] = 384;
bitRateAndFrameSizeTable[14][0][1][1] = 835;
bitRateAndFrameSizeTable[14][1][1][1] = 836;
bitRateAndFrameSizeTable[15][0][1][0] = 448;
bitRateAndFrameSizeTable[15][1][1][0] = 448;
bitRateAndFrameSizeTable[15][0][1][1] = 975;
bitRateAndFrameSizeTable[15][1][1][1] = 975;
bitRateAndFrameSizeTable[16][0][1][0] = 512;
bitRateAndFrameSizeTable[16][1][1][0] = 512;
bitRateAndFrameSizeTable[16][0][1][1] = 1114;
bitRateAndFrameSizeTable[16][1][1][1] = 1115;
bitRateAndFrameSizeTable[17][0][1][0] = 576;
bitRateAndFrameSizeTable[17][1][1][0] = 576;
bitRateAndFrameSizeTable[17][0][1][1] = 1253;
bitRateAndFrameSizeTable[17][1][1][1] = 1254;
bitRateAndFrameSizeTable[18][0][1][0] = 640;
bitRateAndFrameSizeTable[18][1][1][0] = 640;
bitRateAndFrameSizeTable[18][0][1][1] = 1393;
bitRateAndFrameSizeTable[18][1][1][1] = 1394;
// 32kHz
bitRateAndFrameSizeTable[0][0][2][0] = 32;
bitRateAndFrameSizeTable[0][1][2][0] = 32;
bitRateAndFrameSizeTable[0][0][2][1] = 96;
bitRateAndFrameSizeTable[0][1][2][1] = 96;
bitRateAndFrameSizeTable[1][0][2][0] = 40;
bitRateAndFrameSizeTable[1][1][2][0] = 40;
bitRateAndFrameSizeTable[1][0][2][1] = 120;
bitRateAndFrameSizeTable[1][1][2][1] = 120;
bitRateAndFrameSizeTable[2][0][2][0] = 48;
bitRateAndFrameSizeTable[2][1][2][0] = 48;
bitRateAndFrameSizeTable[2][0][2][1] = 144;
bitRateAndFrameSizeTable[2][1][2][1] = 144;
bitRateAndFrameSizeTable[3][0][2][0] = 56;
bitRateAndFrameSizeTable[3][1][2][0] = 56;
bitRateAndFrameSizeTable[3][0][2][1] = 168;
bitRateAndFrameSizeTable[3][1][2][1] = 168;
bitRateAndFrameSizeTable[4][0][2][0] = 64;
bitRateAndFrameSizeTable[4][1][2][0] = 64;
bitRateAndFrameSizeTable[4][0][2][1] = 192;
bitRateAndFrameSizeTable[4][1][2][1] = 192;
bitRateAndFrameSizeTable[5][0][2][0] = 80;
bitRateAndFrameSizeTable[5][1][2][0] = 80;
bitRateAndFrameSizeTable[5][0][2][1] = 240;
bitRateAndFrameSizeTable[5][1][2][1] = 240;
bitRateAndFrameSizeTable[6][0][2][0] = 96;
bitRateAndFrameSizeTable[6][1][2][0] = 96;
bitRateAndFrameSizeTable[6][0][2][1] = 288;
bitRateAndFrameSizeTable[6][1][2][1] = 288;
bitRateAndFrameSizeTable[7][0][2][0] = 112;
bitRateAndFrameSizeTable[7][1][2][0] = 112;
bitRateAndFrameSizeTable[7][0][2][1] = 336;
bitRateAndFrameSizeTable[7][1][2][1] = 336;
bitRateAndFrameSizeTable[8][0][2][0] = 128;
bitRateAndFrameSizeTable[8][1][2][0] = 128;
bitRateAndFrameSizeTable[8][0][2][1] = 384;
bitRateAndFrameSizeTable[8][1][2][1] = 384;
bitRateAndFrameSizeTable[9][0][2][0] = 160;
bitRateAndFrameSizeTable[9][1][2][0] = 160;
bitRateAndFrameSizeTable[9][0][2][1] = 480;
bitRateAndFrameSizeTable[9][1][2][1] = 480;
bitRateAndFrameSizeTable[10][0][2][0] = 192;
bitRateAndFrameSizeTable[10][1][2][0] = 192;
bitRateAndFrameSizeTable[10][0][2][1] = 576;
bitRateAndFrameSizeTable[10][1][2][1] = 576;
bitRateAndFrameSizeTable[11][0][2][0] = 224;
bitRateAndFrameSizeTable[11][1][2][0] = 224;
bitRateAndFrameSizeTable[11][0][2][1] = 672;
bitRateAndFrameSizeTable[11][1][2][1] = 672;
bitRateAndFrameSizeTable[12][0][2][0] = 256;
bitRateAndFrameSizeTable[12][1][2][0] = 256;
bitRateAndFrameSizeTable[12][0][2][1] = 768;
bitRateAndFrameSizeTable[12][1][2][1] = 768;
bitRateAndFrameSizeTable[13][0][2][0] = 320;
bitRateAndFrameSizeTable[13][1][2][0] = 320;
bitRateAndFrameSizeTable[13][0][2][1] = 960;
bitRateAndFrameSizeTable[13][1][2][1] = 960;
bitRateAndFrameSizeTable[14][0][2][0] = 384;
bitRateAndFrameSizeTable[14][1][2][0] = 384;
bitRateAndFrameSizeTable[14][0][2][1] = 1152;
bitRateAndFrameSizeTable[14][1][2][1] = 1152;
bitRateAndFrameSizeTable[15][0][2][0] = 448;
bitRateAndFrameSizeTable[15][1][2][0] = 448;
bitRateAndFrameSizeTable[15][0][2][1] = 1344;
bitRateAndFrameSizeTable[15][1][2][1] = 1344;
bitRateAndFrameSizeTable[16][0][2][0] = 512;
bitRateAndFrameSizeTable[16][1][2][0] = 512;
bitRateAndFrameSizeTable[16][0][2][1] = 1536;
bitRateAndFrameSizeTable[16][1][2][1] = 1536;
bitRateAndFrameSizeTable[17][0][2][0] = 576;
bitRateAndFrameSizeTable[17][1][2][0] = 576;
bitRateAndFrameSizeTable[17][0][2][1] = 1728;
bitRateAndFrameSizeTable[17][1][2][1] = 1728;
bitRateAndFrameSizeTable[18][0][2][0] = 640;
bitRateAndFrameSizeTable[18][1][2][0] = 640;
bitRateAndFrameSizeTable[18][0][2][1] = 1920;
bitRateAndFrameSizeTable[18][1][2][1] = 1920;
}
} |
