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Make FlacExtractor output methods static

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This gives a caller greater confidence that the methods have no
side effects, and remove any nullness issues with these methods
accessing @Nullable member variables.

PiperOrigin-RevId: 256525739
This commit is contained in:
olly 2019-07-04 11:32:20 +01:00 committed by Oliver Woodman
parent 98714235ad
commit 008efd10a4
1 changed files with 41 additions and 24 deletions
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65
extensions/flac/src/main/java/com/google/android/exoplayer2/ext/flac/FlacExtractor.java
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@ -33,6 +33,7 @@ import com.google.android.exoplayer2.extractor.SeekPoint;
import com.google.android.exoplayer2.extractor.TrackOutput;
import com.google.android.exoplayer2.metadata.Metadata;
import com.google.android.exoplayer2.metadata.id3.Id3Decoder;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.FlacStreamInfo;
import com.google.android.exoplayer2.util.MimeTypes;
import com.google.android.exoplayer2.util.ParsableByteArray;
@ -151,7 +152,7 @@ public final class FlacExtractor implements Extractor {
return RESULT_END_OF_INPUT;
}
outputSample(outputBuffer, outputSize, decoderJni.getLastFrameTimestamp());
outputSample(outputBuffer, outputSize, decoderJni.getLastFrameTimestamp(), trackOutput);
return decoderJni.isEndOfData() ? RESULT_END_OF_INPUT : RESULT_CONTINUE;
} finally {
decoderJni.clearData();
@ -193,17 +194,6 @@ public final class FlacExtractor implements Extractor {
return id3Peeker.peekId3Data(input, id3FramePredicate);
}
/**
* Peeks from the beginning of the input to see if {@link #FLAC_SIGNATURE} is present.
*
* @return Whether the input begins with {@link #FLAC_SIGNATURE}.
*/
private boolean peekFlacSignature(ExtractorInput input) throws IOException, InterruptedException {
byte[] header = new byte[FLAC_SIGNATURE.length];
input.peekFully(header, /* offset= */ 0, FLAC_SIGNATURE.length);
return Arrays.equals(header, FLAC_SIGNATURE);
}
private void decodeStreamInfo(ExtractorInput input) throws InterruptedException, IOException {
if (streamInfoDecoded) {
return;
@ -221,8 +211,9 @@ public final class FlacExtractor implements Extractor {
streamInfoDecoded = true;
if (this.streamInfo == null) {
this.streamInfo = streamInfo;
outputSeekMap(streamInfo, input.getLength());
outputFormat(streamInfo, id3MetadataDisabled ? null : id3Metadata);
binarySearchSeeker =
outputSeekMap(decoderJni, streamInfo, input.getLength(), extractorOutput);
outputFormat(streamInfo, id3MetadataDisabled ? null : id3Metadata, trackOutput);
outputBuffer = new ParsableByteArray(streamInfo.maxDecodedFrameSize());
outputFrameHolder = new OutputFrameHolder(ByteBuffer.wrap(outputBuffer.data));
}
@ -230,31 +221,56 @@ public final class FlacExtractor implements Extractor {
private int handlePendingSeek(ExtractorInput input, PositionHolder seekPosition)
throws InterruptedException, IOException {
Assertions.checkNotNull(binarySearchSeeker);
int seekResult = binarySearchSeeker.handlePendingSeek(input, seekPosition, outputFrameHolder);
ByteBuffer outputByteBuffer = outputFrameHolder.byteBuffer;
if (seekResult == RESULT_CONTINUE && outputByteBuffer.limit() > 0) {
outputSample(outputBuffer, outputByteBuffer.limit(), outputFrameHolder.timeUs);
outputSample(outputBuffer, outputByteBuffer.limit(), outputFrameHolder.timeUs, trackOutput);
}
return seekResult;
}
private void outputSeekMap(FlacStreamInfo streamInfo, long inputLength) {
/**
* Peeks from the beginning of the input to see if {@link #FLAC_SIGNATURE} is present.
*
* @return Whether the input begins with {@link #FLAC_SIGNATURE}.
*/
private static boolean peekFlacSignature(ExtractorInput input)
throws IOException, InterruptedException {
byte[] header = new byte[FLAC_SIGNATURE.length];
input.peekFully(header, /* offset= */ 0, FLAC_SIGNATURE.length);
return Arrays.equals(header, FLAC_SIGNATURE);
}
/**
* Outputs a {@link SeekMap} and returns a {@link FlacBinarySearchSeeker} if one is required to
* handle seeks.
*/
@Nullable
private static FlacBinarySearchSeeker outputSeekMap(
FlacDecoderJni decoderJni,
FlacStreamInfo streamInfo,
long streamLength,
ExtractorOutput output) {
boolean hasSeekTable = decoderJni.getSeekPosition(/* timeUs= */ 0) != -1;
FlacBinarySearchSeeker binarySearchSeeker = null;
SeekMap seekMap;
if (hasSeekTable) {
seekMap = new FlacSeekMap(streamInfo.durationUs(), decoderJni);
} else if (inputLength != C.LENGTH_UNSET) {
} else if (streamLength != C.LENGTH_UNSET) {
long firstFramePosition = decoderJni.getDecodePosition();
binarySearchSeeker =
new FlacBinarySearchSeeker(streamInfo, firstFramePosition, inputLength, decoderJni);
new FlacBinarySearchSeeker(streamInfo, firstFramePosition, streamLength, decoderJni);
seekMap = binarySearchSeeker.getSeekMap();
} else {
seekMap = new SeekMap.Unseekable(streamInfo.durationUs());
}
extractorOutput.seekMap(seekMap);
output.seekMap(seekMap);
return binarySearchSeeker;
}
private void outputFormat(FlacStreamInfo streamInfo, Metadata metadata) {
private static void outputFormat(
FlacStreamInfo streamInfo, Metadata metadata, TrackOutput output) {
Format mediaFormat =
Format.createAudioSampleFormat(
/* id= */ null,
@ -272,13 +288,14 @@ public final class FlacExtractor implements Extractor {
/* selectionFlags= */ 0,
/* language= */ null,
metadata);
trackOutput.format(mediaFormat);
output.format(mediaFormat);
}
private void outputSample(ParsableByteArray sampleData, int size, long timeUs) {
private static void outputSample(
ParsableByteArray sampleData, int size, long timeUs, TrackOutput output) {
sampleData.setPosition(0);
trackOutput.sampleData(sampleData, size);
trackOutput.sampleMetadata(
output.sampleData(sampleData, size);
output.sampleMetadata(
timeUs, C.BUFFER_FLAG_KEY_FRAME, size, /* offset= */ 0, /* encryptionData= */ null);
}