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Derive previousNumDeltaPocs from numNegativePics and numPositivePics

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This more closely matches the equations in equations 7-61 and 7-62 in
See H.265/HEVC (2014) section 7.4.8.
This commit is contained in:
Ian Baker 2023-04-18 14:21:49 +01:00
parent a65b5a5c2b
commit 75d81c7630
6 changed files with 16 additions and 13 deletions
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24
libraries/extractor/src/main/java/androidx/media3/extractor/ts/H265Reader.java
View File

@ -417,7 +417,7 @@ public final class H265Reader implements ElementaryStreamReader {
/**
* Reads the number of short term reference picture sets in a SPS as ue(v), then skips all of
* them. See H.265/HEVC (2014) 7.3.7.
* them. See H.265/HEVC (2014) 7.3.7 and 7.4.8.
*/
private static void skipShortTermRefPicSets(ParsableNalUnitBitArray bitArray) {
int numShortTermRefPicSets = bitArray.readUnsignedExpGolombCodedInt();
@ -433,21 +433,27 @@ public final class H265Reader implements ElementaryStreamReader {
interRefPicSetPredictionFlag = bitArray.readBit();
}
if (interRefPicSetPredictionFlag) {
bitArray.skipBit(); // delta_rps_sign
boolean deltaRpsSign = bitArray.readBit(); // delta_rps_sign
bitArray.readUnsignedExpGolombCodedInt(); // abs_delta_rps_minus1
int numDeltaPocs = 0;
numNegativePics = 0;
numPositivePics = 0;
for (int j = 0; j <= previousNumDeltaPocs; j++) {
if (!bitArray.readBit()) { // used_by_curr_pic_flag[j]
if(!bitArray.readBit()) // use_delta_flag[j]
continue; // if not use_delta_flag, skip increase numDeltaPocs
if (bitArray.readBit()) { // use_delta_flag[j]
if (deltaRpsSign) {
// See H.265/HEVC (2014) section 7.4.8 equation 7-61
numNegativePics++;
} else {
// See H.265/HEVC (2014) section 7.4.8 equation 7-62
numPositivePics++;
}
numDeltaPocs++;
}
previousNumDeltaPocs = numDeltaPocs;
}
}
} else {
numNegativePics = bitArray.readUnsignedExpGolombCodedInt();
numPositivePics = bitArray.readUnsignedExpGolombCodedInt();
previousNumDeltaPocs = numNegativePics + numPositivePics;
for (int i = 0; i < numNegativePics; i++) {
bitArray.readUnsignedExpGolombCodedInt(); // delta_poc_s0_minus1[i]
bitArray.skipBit(); // used_by_curr_pic_s0_flag[i]
@ -457,6 +463,8 @@ public final class H265Reader implements ElementaryStreamReader {
bitArray.skipBit(); // used_by_curr_pic_s1_flag[i]
}
}
// See H.265/HEVC (2014) section 7.4.8 equation 7-71
previousNumDeltaPocs = numNegativePics + numPositivePics;
}
}

1
libraries/test_data/src/test/assets/extractordumps/ts/sample_h265_rps_pred.ts.0.dump
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@ -15,7 +15,6 @@ track 256:
codecs = hvc1.1.6.L63.90
width = 914
height = 686
pixelWidthHeightRatio = 1.0003651
initializationData:
data = length 146, hash 61554FEF
sample 0:

1
libraries/test_data/src/test/assets/extractordumps/ts/sample_h265_rps_pred.ts.1.dump
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@ -15,7 +15,6 @@ track 256:
codecs = hvc1.1.6.L63.90
width = 914
height = 686
pixelWidthHeightRatio = 1.0003651
initializationData:
data = length 146, hash 61554FEF
sample 0:

1
libraries/test_data/src/test/assets/extractordumps/ts/sample_h265_rps_pred.ts.2.dump
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@ -15,7 +15,6 @@ track 256:
codecs = hvc1.1.6.L63.90
width = 914
height = 686
pixelWidthHeightRatio = 1.0003651
initializationData:
data = length 146, hash 61554FEF
sample 0:

1
libraries/test_data/src/test/assets/extractordumps/ts/sample_h265_rps_pred.ts.3.dump
View File

@ -15,7 +15,6 @@ track 256:
codecs = hvc1.1.6.L63.90
width = 914
height = 686
pixelWidthHeightRatio = 1.0003651
initializationData:
data = length 146, hash 61554FEF
sample 0:

1
libraries/test_data/src/test/assets/extractordumps/ts/sample_h265_rps_pred.ts.unknown_length.dump
View File

@ -12,7 +12,6 @@ track 256:
codecs = hvc1.1.6.L63.90
width = 914
height = 686
pixelWidthHeightRatio = 1.0003651
initializationData:
data = length 146, hash 61554FEF
sample 0: