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Fix audio encode timestamp off by one

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Simplify the audio encoder input timestamp calculation. The new calculation
avoids drifting by tracking the total number of bytes encoded rather than
tracking the timestamp and remainder separately, and also makes the timestamps
match the decoder output buffer timestamps.

Also switch one of the export tests that was passing through AMR samples over
to using WAVE audio. The problem with using AMR is that the compressed samples
are not necessarily an integer number of audio frames and the shadow decoder
would pass them from input to output, so the audio encoder was receiving
non-integer numbers of audio frames.

Tested by logging the timestamps at the decoder output and encoder input with
forcing transcoding audio, and verifying that after this change the audio
timestamps are no longer off by one.

PiperOrigin-RevId: 523409869
This commit is contained in:
andrewlewis 2023-04-11 16:33:38 +01:00 committed by Rohit Singh
parent 0b40bc37ab
commit d43fe3470f
14 changed files with 433 additions and 1695 deletions
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1314
libraries/test_data/src/test/assets/transformerdumps/amr/sample_nb.amr.aac.dump
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56
libraries/test_data/src/test/assets/transformerdumps/mkv/sample_with_srt.mkv.dump
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74
libraries/test_data/src/test/assets/transformerdumps/mp4/sample.mp4.48000hz.dump
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libraries/test_data/src/test/assets/transformerdumps/mp4/sample.mp4.concatenated_with_high_pitch_and_no_video.dump
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178
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124
libraries/test_data/src/test/assets/transformerdumps/mp4/sample.mp4.silence_then_audio_with_effects.dump
View file

@ -27,127 +27,127 @@ sample:
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88
libraries/test_data/src/test/assets/transformerdumps/mp4/sample.mp4.silentaudio.dump
View file

@ -27,127 +27,127 @@ sample:
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86
libraries/test_data/src/test/assets/transformerdumps/mp4/sample_18byte_nclx_colr.mp4.silentaudio.dump
View file

@ -30,127 +30,127 @@ sample:
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size = 4096
isKeyFrame = true
presentationTimeUs = 116100
presentationTimeUs = 116099
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 139320
presentationTimeUs = 139319
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 162540
presentationTimeUs = 162539
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 185760
presentationTimeUs = 185759
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 208980
presentationTimeUs = 208979
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 232200
presentationTimeUs = 232199
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 255420
presentationTimeUs = 255419
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 278640
presentationTimeUs = 278639
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 301860
presentationTimeUs = 301859
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 325080
presentationTimeUs = 325079
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 348300
presentationTimeUs = 348299
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 371520
presentationTimeUs = 371519
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 394740
presentationTimeUs = 394739
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 417960
presentationTimeUs = 417959
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 441180
presentationTimeUs = 441179
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 464400
presentationTimeUs = 464399
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 487620
presentationTimeUs = 487619
sample:
trackIndex = 0
dataHashCode = -770308242
@ -216,85 +216,85 @@ sample:
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 510840
presentationTimeUs = 510839
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 534059
presentationTimeUs = 534058
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 557279
presentationTimeUs = 557278
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 580499
presentationTimeUs = 580498
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 603719
presentationTimeUs = 603718
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 626939
presentationTimeUs = 626938
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 650159
presentationTimeUs = 650158
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 673379
presentationTimeUs = 673378
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 696599
presentationTimeUs = 696598
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 719819
presentationTimeUs = 719818
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 743039
presentationTimeUs = 743038
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 766259
presentationTimeUs = 766258
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 789479
presentationTimeUs = 789478
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 812699
presentationTimeUs = 812698
sample:
trackIndex = 0
dataHashCode = 1949198785
@ -360,49 +360,49 @@ sample:
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 835919
presentationTimeUs = 835918
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 859139
presentationTimeUs = 859138
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 882359
presentationTimeUs = 882358
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 905579
presentationTimeUs = 905578
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 928799
presentationTimeUs = 928798
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 952019
presentationTimeUs = 952018
sample:
trackIndex = 1
dataHashCode = 1742602241
size = 4096
isKeyFrame = true
presentationTimeUs = 975239
presentationTimeUs = 975238
sample:
trackIndex = 1
dataHashCode = 226248705
size = 448
isKeyFrame = true
presentationTimeUs = 998459
presentationTimeUs = 998458
sample:
trackIndex = 0
dataHashCode = -1723778407

12
libraries/test_data/src/test/assets/transformerdumps/mp4/sample_ac3.mp4.fallback.dump
View file

@ -14,13 +14,13 @@ sample:
dataHashCode = -2134951116
size = 1536
isKeyFrame = true
presentationTimeUs = 2667
presentationTimeUs = 2666
sample:
trackIndex = 0
dataHashCode = 97556101
size = 1536
isKeyFrame = true
presentationTimeUs = 5334
presentationTimeUs = 5333
sample:
trackIndex = 0
dataHashCode = -1448980924
@ -32,13 +32,13 @@ sample:
dataHashCode = 1871012467
size = 1536
isKeyFrame = true
presentationTimeUs = 10667
presentationTimeUs = 10666
sample:
trackIndex = 0
dataHashCode = -1317831364
size = 1536
isKeyFrame = true
presentationTimeUs = 13334
presentationTimeUs = 13333
sample:
trackIndex = 0
dataHashCode = -1728189539
@ -50,11 +50,11 @@ sample:
dataHashCode = -1715881661
size = 1536
isKeyFrame = true
presentationTimeUs = 18667
presentationTimeUs = 18666
sample:
trackIndex = 0
dataHashCode = -1428554542
size = 1536
isKeyFrame = true
presentationTimeUs = 21334
presentationTimeUs = 21333
released = true

28
libraries/test_data/src/test/assets/transformerdumps/mp4/sample_sef_slow_motion.mp4.dump
View file

@ -29,19 +29,19 @@ sample:
dataHashCode = -1948569090
size = 72
isKeyFrame = true
presentationTimeUs = 417
presentationTimeUs = 416
sample:
trackIndex = 1
dataHashCode = -1316750072
size = 84
isKeyFrame = true
presentationTimeUs = 1917
presentationTimeUs = 1916
sample:
trackIndex = 1
dataHashCode = 1016428949
size = 88
isKeyFrame = true
presentationTimeUs = 3667
presentationTimeUs = 3666
sample:
trackIndex = 1
dataHashCode = -1127325245
@ -119,7 +119,7 @@ sample:
dataHashCode = -2125685540
size = 76
isKeyFrame = true
presentationTimeUs = 9417
presentationTimeUs = 9416
sample:
trackIndex = 1
dataHashCode = 473329679
@ -137,7 +137,7 @@ sample:
dataHashCode = 777637182
size = 196
isKeyFrame = true
presentationTimeUs = 15167
presentationTimeUs = 15166
sample:
trackIndex = 1
dataHashCode = 1872106264
@ -155,7 +155,7 @@ sample:
dataHashCode = 1580199067
size = 232
isKeyFrame = true
presentationTimeUs = 25917
presentationTimeUs = 25916
sample:
trackIndex = 1
dataHashCode = 475464086
@ -167,13 +167,13 @@ sample:
dataHashCode = -211754132
size = 172
isKeyFrame = true
presentationTimeUs = 34584
presentationTimeUs = 34583
sample:
trackIndex = 1
dataHashCode = 1236547164
size = 172
isKeyFrame = true
presentationTimeUs = 38167
presentationTimeUs = 38166
sample:
trackIndex = 1
dataHashCode = -2064216186
@ -227,13 +227,13 @@ sample:
dataHashCode = -682950885
size = 260
isKeyFrame = true
presentationTimeUs = 45667
presentationTimeUs = 45666
sample:
trackIndex = 1
dataHashCode = 1301206627
size = 236
isKeyFrame = true
presentationTimeUs = 51084
presentationTimeUs = 51083
sample:
trackIndex = 1
dataHashCode = 256580525
@ -245,13 +245,13 @@ sample:
dataHashCode = -1086601304
size = 236
isKeyFrame = true
presentationTimeUs = 60917
presentationTimeUs = 60916
sample:
trackIndex = 1
dataHashCode = -2046131588
size = 224
isKeyFrame = true
presentationTimeUs = 65834
presentationTimeUs = 65833
sample:
trackIndex = 1
dataHashCode = 1550955865
@ -263,7 +263,7 @@ sample:
dataHashCode = -274800552
size = 220
isKeyFrame = true
presentationTimeUs = 75167
presentationTimeUs = 75166
sample:
trackIndex = 1
dataHashCode = 382420909
@ -275,7 +275,7 @@ sample:
dataHashCode = -1431575865
size = 232
isKeyFrame = true
presentationTimeUs = 84417
presentationTimeUs = 84416
sample:
trackIndex = 0
dataHashCode = 2112365658

66
libraries/test_data/src/test/assets/transformerdumps/wav/sample.wav.aac.dump Normal file
View file

@ -0,0 +1,66 @@
format 0:
sampleMimeType = audio/mp4a-latm
channelCount = 1
sampleRate = 44100
pcmEncoding = 2
sample:
trackIndex = 0
dataHashCode = -85819864
size = 8820
isKeyFrame = true
presentationTimeUs = 0
sample:
trackIndex = 0
dataHashCode = 566487491
size = 8820
isKeyFrame = true
presentationTimeUs = 100000
sample:
trackIndex = 0
dataHashCode = -1256531710
size = 8820
isKeyFrame = true
presentationTimeUs = 200000
sample:
trackIndex = 0
dataHashCode = 793455796
size = 8820
isKeyFrame = true
presentationTimeUs = 300000
sample:
trackIndex = 0
dataHashCode = -268235582
size = 8820
isKeyFrame = true
presentationTimeUs = 400000
sample:
trackIndex = 0
dataHashCode = -8136122
size = 8820
isKeyFrame = true
presentationTimeUs = 500000
sample:
trackIndex = 0
dataHashCode = 1750866613
size = 8820
isKeyFrame = true
presentationTimeUs = 600000
sample:
trackIndex = 0
dataHashCode = -1100753636
size = 8820
isKeyFrame = true
presentationTimeUs = 700000
sample:
trackIndex = 0
dataHashCode = 507833230
size = 8820
isKeyFrame = true
presentationTimeUs = 800000
sample:
trackIndex = 0
dataHashCode = 1472467506
size = 8820
isKeyFrame = true
presentationTimeUs = 900000
released = true

28
libraries/transformer/src/main/java/androidx/media3/transformer/AudioSamplePipeline.java
View file

@ -53,8 +53,7 @@ import org.checkerframework.dataflow.qual.Pure;
private final DecoderInputBuffer encoderInputBuffer;
private final DecoderInputBuffer encoderOutputBuffer;
private long nextEncoderInputBufferTimeUs;
private long encoderBufferDurationRemainder;
private long encoderTotalInputBytes;
private volatile boolean queueEndOfStreamAfterSilence;
@ -334,9 +333,8 @@ import org.checkerframework.dataflow.qual.Pure;
int bufferLimit = inputBuffer.limit();
inputBuffer.limit(min(bufferLimit, inputBuffer.position() + encoderInputBufferData.capacity()));
encoderInputBufferData.put(inputBuffer);
encoderInputBuffer.timeUs = nextEncoderInputBufferTimeUs;
computeNextEncoderInputBufferTimeUs(
/* bytesWritten= */ encoderInputBufferData.position(), encoderInputAudioFormat);
encoderInputBuffer.timeUs = getOutputAudioDurationUs();
encoderTotalInputBytes += encoderInputBufferData.position();
encoderInputBuffer.setFlags(0);
encoderInputBuffer.flip();
inputBuffer.limit(bufferLimit);
@ -345,7 +343,7 @@ import org.checkerframework.dataflow.qual.Pure;
private void queueEndOfStreamToEncoder() throws ExportException {
checkState(checkNotNull(encoderInputBuffer.data).position() == 0);
encoderInputBuffer.timeUs = nextEncoderInputBufferTimeUs;
encoderInputBuffer.timeUs = getOutputAudioDurationUs();
encoderInputBuffer.addFlag(C.BUFFER_FLAG_END_OF_STREAM);
encoderInputBuffer.flip();
// Queuing EOS should only occur with an empty buffer.
@ -363,21 +361,9 @@ import org.checkerframework.dataflow.qual.Pure;
return transformationRequest.buildUpon().setAudioMimeType(actualFormat.sampleMimeType).build();
}
private void computeNextEncoderInputBufferTimeUs(long bytesWritten, AudioFormat audioFormat) {
// The calculation below accounts for remainders and rounding. Without that it corresponds to
// the following:
// bufferDurationUs = numberOfFramesInBuffer * sampleDurationUs
// where numberOfFramesInBuffer = bytesWritten / bytesPerFrame
// and sampleDurationUs = C.MICROS_PER_SECOND / sampleRate
long numerator = bytesWritten * C.MICROS_PER_SECOND + encoderBufferDurationRemainder;
long denominator = (long) audioFormat.bytesPerFrame * audioFormat.sampleRate;
long bufferDurationUs = numerator / denominator;
encoderBufferDurationRemainder = numerator - bufferDurationUs * denominator;
if (encoderBufferDurationRemainder > 0) { // Ceil division result.
bufferDurationUs += 1;
encoderBufferDurationRemainder -= denominator;
}
nextEncoderInputBufferTimeUs += bufferDurationUs;
private long getOutputAudioDurationUs() {
long totalFramesWritten = encoderTotalInputBytes / encoderInputAudioFormat.bytesPerFrame;
return (totalFramesWritten * C.MICROS_PER_SECOND) / encoderInputAudioFormat.sampleRate;
}
private boolean shouldGenerateSilence() {

7
libraries/transformer/src/test/java/androidx/media3/transformer/MediaItemExportTest.java
View file

@ -21,6 +21,7 @@ import static androidx.media3.test.utils.robolectric.RobolectricUtil.runLooperUn
import static androidx.media3.transformer.AssetLoader.SUPPORTED_OUTPUT_TYPE_DECODED;
import static androidx.media3.transformer.AssetLoader.SUPPORTED_OUTPUT_TYPE_ENCODED;
import static androidx.media3.transformer.TestUtil.ASSET_URI_PREFIX;
import static androidx.media3.transformer.TestUtil.FILE_AUDIO_RAW;
import static androidx.media3.transformer.TestUtil.FILE_AUDIO_UNSUPPORTED_BY_DECODER;
import static androidx.media3.transformer.TestUtil.FILE_AUDIO_UNSUPPORTED_BY_ENCODER;
import static androidx.media3.transformer.TestUtil.FILE_AUDIO_UNSUPPORTED_BY_MUXER;
@ -161,15 +162,13 @@ public final class MediaItemExportTest {
.setAudioMimeType(MimeTypes.AUDIO_AAC) // supported by encoder and muxer
.build())
.build();
MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_UNSUPPORTED_BY_ENCODER);
MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_RAW);
transformer.start(mediaItem, outputPath);
TransformerTestRunner.runLooper(transformer);
DumpFileAsserts.assertOutput(
context,
checkNotNull(testMuxerHolder.testMuxer),
getDumpFileName(FILE_AUDIO_UNSUPPORTED_BY_ENCODER + ".aac"));
context, checkNotNull(testMuxerHolder.testMuxer), getDumpFileName(FILE_AUDIO_RAW + ".aac"));
}
@Test

3
libraries/transformer/src/test/java/androidx/media3/transformer/TestUtil.java
View file

@ -150,6 +150,7 @@ public final class TestUtil {
public static final String FILE_AUDIO_VIDEO = "mp4/sample.mp4";
public static final String FILE_AUDIO_VIDEO_INCREASING_TIMESTAMPS_15S =
"mp4/sample_with_increasing_timestamps_320w_240h.mp4";
public static final String FILE_AUDIO_RAW = "wav/sample.wav";
public static final String FILE_WITH_SUBTITLES = "mkv/sample_with_srt.mkv";
public static final String FILE_WITH_SEF_SLOW_MOTION = "mp4/sample_sef_slow_motion.mp4";
public static final String FILE_AUDIO_UNSUPPORTED_BY_DECODER = "amr/sample_wb.amr";
@ -179,7 +180,7 @@ public final class TestUtil {
/* colorFormats= */ ImmutableList.of(),
/* isDecoder= */ true);
addCodec(
MimeTypes.AUDIO_AMR_NB,
MimeTypes.AUDIO_RAW,
codecConfig,
/* colorFormats= */ ImmutableList.of(),
/* isDecoder= */ true);