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Fixup bitstream_restriction_flag and max_dec_frame_buffering in the SPS to fix decoding latency issues on Tegra and the Raspberry Pi

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This commit is contained in:
Cameron Gutman 2014-01-06 22:52:11 -06:00
parent 95d035f00b
commit b4a0f81eda
1 changed files with 38 additions and 0 deletions
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38
moonlight-common/src/com/limelight/nvstream/av/video/VideoDepacketizer.java
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@ -41,6 +41,44 @@ public class VideoDepacketizer {
{
// This is the start of a new NAL
if (avcNalDataChain != null && avcNalDataLength != 0) {
ByteBufferDescriptor header = avcNalDataChain.getFirst();
// The SPS that comes in the current H264 bytestream doesn't set bitstream_restriction_flag
// or max_dec_frame_buffering which increases decoding latency on (at least) Tegra
// and Raspberry Pi. We manually modify the SPS here to speed-up decoding.
if (header.data[header.offset+4] == 0x67) {
// It's an SPS
ByteBufferDescriptor newSps;
switch (header.length) {
case 26:
System.out.println("Modifying SPS (26)");
newSps = new ByteBufferDescriptor(new byte[header.length+2], 0, header.length+2);
System.arraycopy(header.data, header.offset, newSps.data, 0, 24);
newSps.data[24] = 0x11;
newSps.data[25] = (byte)0xe3;
newSps.data[26] = 0x06;
newSps.data[27] = 0x50;
break;
case 27:
System.out.println("Modifying SPS (27)");
newSps = new ByteBufferDescriptor(new byte[header.length+2], 0, header.length+2);
System.arraycopy(header.data, header.offset, newSps.data, 0, 25);
newSps.data[25] = 0x04;
newSps.data[26] = 0x78;
newSps.data[27] = (byte) 0xc1;
newSps.data[28] = (byte) 0x94;
break;
default:
System.out.println("Unknown SPS of length "+header.length);
newSps = header;
break;
}
avcNalDataChain.clear();
avcNalDataChain.add(newSps);
avcNalDataLength = newSps.length;
}
// Construct the H264 decode unit
DecodeUnit du = new DecodeUnit(DecodeUnit.TYPE_H264, avcNalDataChain, avcNalDataLength, 0);
if (!decodedUnits.offer(du)) {