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decrease the size of samples per chunk

This commit is contained in:
kapodamy 2020-01-13 21:25:26 -03:00
parent 9f47a274a8
commit 49cc643dcc
1 changed files with 129 additions and 50 deletions
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179
app/src/main/java/org/schabi/newpipe/streams/Mp4FromDashWriter.java
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@ -11,6 +11,7 @@ import org.schabi.newpipe.streams.io.SharpStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
/**
* @author kapodamy
@ -23,7 +24,6 @@ public class Mp4FromDashWriter {
private final static byte SAMPLES_PER_CHUNK = 6;// ffmpeg uses 2, basic uses 1 (with 60fps uses 21 or 22). NewPipe will use 6
private final static long THRESHOLD_FOR_CO64 = 0xFFFEFFFFL;// near 3.999 GiB
private final static int THRESHOLD_MOOV_LENGTH = (256 * 1024) + (2048 * 1024); // 2.2 MiB enough for: 1080p 60fps 00h35m00s
private final static short SINGLE_CHUNK_SAMPLE_BUFFER = 256;
private final long time;
@ -46,6 +46,8 @@ public class Mp4FromDashWriter {
private int overrideMainBrand = 0x00;
private ArrayList<Integer> compatibleBrands = new ArrayList<>(5);
public Mp4FromDashWriter(SharpStream... sources) throws IOException {
for (SharpStream src : sources) {
if (!src.canRewind() && !src.canRead()) {
@ -57,6 +59,10 @@ public class Mp4FromDashWriter {
readers = new Mp4DashReader[sourceTracks.length];
readersChunks = new Mp4DashChunk[readers.length];
time = (System.currentTimeMillis() / 1000L) + EPOCH_OFFSET;
compatibleBrands.add(0x6D703431);// mp41
compatibleBrands.add(0x69736F6D);// isom
compatibleBrands.add(0x69736F32);// iso2
}
public Mp4Track[] getTracksFromSource(int sourceIndex) throws IllegalStateException {
@ -104,8 +110,8 @@ public class Mp4FromDashWriter {
}
}
public void setMainBrand(int brandId) {
overrideMainBrand = brandId;
public void setMainBrand(int brand) {
overrideMainBrand = brand;
}
public boolean isDone() {
@ -159,7 +165,13 @@ public class Mp4FromDashWriter {
tablesInfo[i] = new TablesInfo();
}
boolean singleChunk = tracks.length == 1 && tracks[0].kind == TrackKind.Audio;
int single_sample_buffer;
if (tracks.length == 1 && tracks[0].kind == TrackKind.Audio) {
// near 1 second of audio data per chunk, avoid split the audio stream in large chunks
single_sample_buffer = tracks[0].trak.mdia.mdhd_timeScale / 1000;
} else {
single_sample_buffer = -1;
}
for (int i = 0; i < readers.length; i++) {
@ -210,31 +222,10 @@ public class Mp4FromDashWriter {
readers[i].rewind();
int tmp = tablesInfo[i].stsz - SAMPLES_PER_CHUNK_INIT;
tablesInfo[i].stco = (tmp / SAMPLES_PER_CHUNK) + 1;// +1 for samples in first chunk
tmp = tmp % SAMPLES_PER_CHUNK;
if (singleChunk) {
// avoid split audio streams in chunks
tablesInfo[i].stsc = 1;
tablesInfo[i].stsc_bEntries = new int[]{
1, tablesInfo[i].stsz, 1
};
tablesInfo[i].stco = 1;
} else if (tmp == 0) {
tablesInfo[i].stsc = 2;// first chunk (init) and succesive chunks
tablesInfo[i].stsc_bEntries = new int[]{
1, SAMPLES_PER_CHUNK_INIT, 1,
2, SAMPLES_PER_CHUNK, 1
};
if (single_sample_buffer > 0) {
initChunkTables(tablesInfo[i], single_sample_buffer, single_sample_buffer);
} else {
tablesInfo[i].stsc = 3;// first chunk (init) and successive chunks and remain chunk
tablesInfo[i].stsc_bEntries = new int[]{
1, SAMPLES_PER_CHUNK_INIT, 1,
2, SAMPLES_PER_CHUNK, 1,
tablesInfo[i].stco + 1, tmp, 1
};
tablesInfo[i].stco++;
initChunkTables(tablesInfo[i], SAMPLES_PER_CHUNK_INIT, SAMPLES_PER_CHUNK);
}
sampleCount[i] = tablesInfo[i].stsz;
@ -274,6 +265,7 @@ public class Mp4FromDashWriter {
// reserve moov space in the output stream
/*if (outStream.canSetLength()) {
long length = writeOffset + auxSize;
// warning: setLength() does not fill the unused space with zeros
outStream.setLength(length);
outSeek(length);
} else {*/
@ -292,10 +284,10 @@ public class Mp4FromDashWriter {
}
// tablesInfo contains row counts
// and after returning from make_moov() will contain table offsets
// and after returning from make_moov() will contain those table offsets
make_moov(defaultMediaTime, tablesInfo, is64);
// write tables: stts stsc
// write tables: stts stsc sbgp
// reset for ctts table: sampleCount sampleExtra
for (int i = 0; i < readers.length; i++) {
writeEntryArray(tablesInfo[i].stts, 2, sampleCount[i], defaultSampleDuration[i]);
@ -305,6 +297,7 @@ public class Mp4FromDashWriter {
sampleCount[i] = 1;// the index is not base zero
sampleExtra[i] = -1;
}
writeEntryArray(tablesInfo[i].sbgp, 1, sampleCount[i]);
}
if (auxBuffer == null) {
@ -314,8 +307,8 @@ public class Mp4FromDashWriter {
outWrite(make_mdat(totalSampleSize, is64));
int[] sampleIndex = new int[readers.length];
int[] sizes = new int[singleChunk ? SINGLE_CHUNK_SAMPLE_BUFFER : SAMPLES_PER_CHUNK];
int[] sync = new int[singleChunk ? SINGLE_CHUNK_SAMPLE_BUFFER : SAMPLES_PER_CHUNK];
int[] sizes = new int[single_sample_buffer > 0 ? single_sample_buffer : SAMPLES_PER_CHUNK];
int[] sync = new int[single_sample_buffer > 0 ? single_sample_buffer : SAMPLES_PER_CHUNK];
int written = readers.length;
while (written > 0) {
@ -329,8 +322,8 @@ public class Mp4FromDashWriter {
long chunkOffset = writeOffset;
int syncCount = 0;
int limit;
if (singleChunk) {
limit = SINGLE_CHUNK_SAMPLE_BUFFER;
if (single_sample_buffer > 0) {
limit = single_sample_buffer;
} else {
limit = sampleIndex[i] == 0 ? SAMPLES_PER_CHUNK_INIT : SAMPLES_PER_CHUNK;
}
@ -390,10 +383,6 @@ public class Mp4FromDashWriter {
} else {
tablesInfo[i].stco = writeEntryArray(tablesInfo[i].stco, 1, (int) chunkOffset);
}
if (singleChunk) {
tablesInfo[i].stco = -1;
}
}
outRestore();
@ -470,7 +459,42 @@ public class Mp4FromDashWriter {
}
}
private void initChunkTables(TablesInfo tables, int firstCount, int succesiveCount) {
// tables.stsz holds amount of samples of the track (total)
int totalSamples = (tables.stsz - firstCount);
float chunkAmount = totalSamples / (float) succesiveCount;
int remainChunkOffset = (int) Math.ceil(chunkAmount);
boolean remain = remainChunkOffset != (int) chunkAmount;
int index = 0;
tables.stsc = 1;
if (firstCount != succesiveCount) {
tables.stsc++;
}
if (remain) {
tables.stsc++;
}
// stsc_table_entry = [first_chunk, samples_per_chunk, sample_description_index]
tables.stsc_bEntries = new int[tables.stsc * 3];
tables.stco = remainChunkOffset + 1;// total entrys in chunk offset box
tables.stsc_bEntries[index++] = 1;
tables.stsc_bEntries[index++] = firstCount;
tables.stsc_bEntries[index++] = 1;
if (firstCount != succesiveCount) {
tables.stsc_bEntries[index++] = 2;
tables.stsc_bEntries[index++] = succesiveCount;
tables.stsc_bEntries[index++] = 1;
}
if (remain) {
tables.stsc_bEntries[index++] = remainChunkOffset + 1;
tables.stsc_bEntries[index++] = totalSamples % succesiveCount;
tables.stsc_bEntries[index] = 1;
}
}
private void outWrite(byte[] buffer) throws IOException {
outWrite(buffer, buffer.length);
@ -585,19 +609,29 @@ public class Mp4FromDashWriter {
private int make_ftyp() throws IOException {
byte[] buffer = new byte[]{
0x00, 0x00, 0x00, 0x1C, 0x66, 0x74, 0x79, 0x70,// ftyp
0x6D, 0x70, 0x34, 0x32,// mayor brand (mp42)
0x00, 0x00, 0x02, 0x00,// default minor version (512)
0x6D, 0x70, 0x34, 0x31, 0x69, 0x73, 0x6F, 0x6D, 0x69, 0x73, 0x6F, 0x32// compatible brands: mp41 isom iso2
};
int size = 16 + (compatibleBrands.size() * 4);
if (overrideMainBrand != 0) size += 4;
if (overrideMainBrand != 0)
ByteBuffer.wrap(buffer).putInt(8, overrideMainBrand);
ByteBuffer buffer = ByteBuffer.allocate(size);
buffer.putInt(size);
buffer.putInt(0x66747970);// "ftyp"
outWrite(buffer);
if (overrideMainBrand == 0) {
buffer.putInt(0x6D703432);// mayor brand "mp42"
buffer.putInt(512);// default minor version
} else {
buffer.putInt(overrideMainBrand);
buffer.putInt(0);
buffer.putInt(0x6D703432);// "mp42" compatible brand
}
return buffer.length;
for (Integer brand : compatibleBrands) {
buffer.putInt(brand);// compatible brand
}
outWrite(buffer.array());
return size;
}
private byte[] make_mdat(long refSize, boolean is64) {
@ -746,7 +780,6 @@ public class Mp4FromDashWriter {
}
private void make_mdia(Mdia mdia, TablesInfo tablesInfo, boolean is64) throws IOException {
int start_mdia = auxOffset();
auxWrite(new byte[]{0x00, 0x00, 0x00, 0x00, 0x6D, 0x64, 0x69, 0x61});// mdia
auxWrite(mdia.mdhd);
@ -766,7 +799,7 @@ public class Mp4FromDashWriter {
// And stsz can be empty if has a default sample size
//
if (moovSimulation) {
make(0x73747473, -1, 2, 1);
make(0x73747473, -1, 2, 1);// stts
if (tablesInfo.stss > 0) {
make(0x73747373, -1, 1, tablesInfo.stss);
}
@ -789,6 +822,9 @@ public class Mp4FromDashWriter {
tablesInfo.stco = make(is64 ? 0x636F3634 : 0x7374636F, -1, is64 ? 2 : 1, tablesInfo.stco);
}
auxWrite(make_sgpd());
tablesInfo.sbgp = make_sbgp();// during simulation the returned offset is ignored
lengthFor(start_stbl);
lengthFor(start_minf);
lengthFor(start_mdia);
@ -816,6 +852,48 @@ public class Mp4FromDashWriter {
return buffer.array();
}
private int make_sbgp() throws IOException {
int offset = auxOffset();
auxWrite(new byte[] {
0x00, 0x00, 0x00, 0x1C,// box size
0x73, 0x62, 0x67, 0x70,// "sbpg"
0x00, 0x00, 0x00, 0x00,// default box flags
0x72, 0x6F, 0x6C, 0x6C,// group type "roll"
0x00, 0x00, 0x00, 0x01,// group table size
0x00, 0x00, 0x00, 0x00,// group[0] total samples (to be set later)
0x00, 0x00, 0x00, 0x01// group[0] description index
});
return offset + 0x14;
}
private byte[] make_sgpd() {
/*
* Sample Group Description Box
*
* ¿whats does?
* the table inside of this box gives information about the
* characteristics of sample groups. The descriptive information is any other
* information needed to define or characterize the sample group.
*
* ¿is replicabled this box?
* NO due lacks of documentation about this box but...
* most of m4a encoders and ffmpeg uses this box with dummy values (same values)
*/
ByteBuffer buffer = ByteBuffer.wrap(new byte[] {
0x00, 0x00, 0x00, 0x1A,// box size
0x73, 0x67, 0x70, 0x64,// "sgpd"
0x01, 0x00, 0x00, 0x00,// box flags (unknown flag sets)
0x72, 0x6F, 0x6C, 0x6C, // ¿¿group type??
0x00, 0x00, 0x00, 0x02,// ¿¿??
0x00, 0x00, 0x00, 0x01,// ¿¿??
(byte)0xFF, (byte)0xFF// ¿¿??
});
return buffer.array();
}
class TablesInfo {
@ -827,5 +905,6 @@ public class Mp4FromDashWriter {
int stsz_default;
int stss;
int stco;
int sbgp;
}
}