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Extract HlsMediaChunk#feedDataToExtractor method

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Deduplicates the call to Extractor#read and sorrounding logic.

PiperOrigin-RevId: 235165499
This commit is contained in:
aquilescanta 2019-02-22 11:34:44 +00:00 committed by Oliver Woodman
parent 325029d58e
commit 6682580ad7
1 changed files with 23 additions and 34 deletions
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57
library/hls/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaChunk.java
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@ -203,7 +203,8 @@ import java.util.concurrent.atomic.AtomicInteger;
private Extractor extractor;
private boolean isExtractorReusable;
private HlsSampleStreamWrapper output;
private int initSegmentBytesLoaded;
// nextLoadPosition refers to the init segment if initDataLoadRequired is true.
// Otherwise, nextLoadPosition refers to the media segment.
private int nextLoadPosition;
private boolean initDataLoadRequired;
private volatile boolean loadCanceled;
@ -307,54 +308,42 @@ import java.util.concurrent.atomic.AtomicInteger;
if (!initDataLoadRequired) {
return;
}
DataSpec initSegmentDataSpec;
boolean skipLoadedBytes;
if (initSegmentEncrypted) {
initSegmentDataSpec = initDataSpec;
skipLoadedBytes = initSegmentBytesLoaded != 0;
} else {
initSegmentDataSpec = initDataSpec.subrange(initSegmentBytesLoaded);
skipLoadedBytes = false;
}
try {
DefaultExtractorInput input = prepareExtraction(initDataSource, initSegmentDataSpec);
if (skipLoadedBytes) {
input.skipFully(initSegmentBytesLoaded);
}
try {
int result = Extractor.RESULT_CONTINUE;
while (result == Extractor.RESULT_CONTINUE && !loadCanceled) {
result = extractor.read(input, null);
}
} finally {
initSegmentBytesLoaded = (int) (input.getPosition() - initDataSpec.absoluteStreamPosition);
}
} finally {
Util.closeQuietly(initDataSource);
}
feedDataToExtractor(initDataSource, initDataSpec, initSegmentEncrypted);
nextLoadPosition = 0;
initDataLoadRequired = false;
}
private void loadMedia() throws IOException, InterruptedException {
if (!isMasterTimestampSource) {
timestampAdjuster.waitUntilInitialized();
} else if (timestampAdjuster.getFirstSampleTimestampUs() == TimestampAdjuster.DO_NOT_OFFSET) {
// We're the master and we haven't set the desired first sample timestamp yet.
timestampAdjuster.setFirstSampleTimestampUs(startTimeUs);
}
feedDataToExtractor(dataSource, dataSpec, mediaSegmentEncrypted);
}
/**
* Attempts to feed the given {@code dataSpec} to {@code this.extractor}. Whenever the operation
* concludes (because of a thrown exception or because the operation finishes), the number of fed
* bytes is written to {@code nextLoadPosition}.
*/
private void feedDataToExtractor(
DataSource dataSource, DataSpec dataSpec, boolean dataIsEncrypted)
throws IOException, InterruptedException {
// If we previously fed part of this chunk to the extractor, we need to skip it this time. For
// encrypted content we need to skip the data by reading it through the source, so as to ensure
// correct decryption of the remainder of the chunk. For clear content, we can request the
// remainder of the chunk directly.
DataSpec loadDataSpec;
boolean skipLoadedBytes;
if (mediaSegmentEncrypted) {
if (dataIsEncrypted) {
loadDataSpec = dataSpec;
skipLoadedBytes = nextLoadPosition != 0;
} else {
loadDataSpec = dataSpec.subrange(nextLoadPosition);
skipLoadedBytes = false;
}
if (!isMasterTimestampSource) {
timestampAdjuster.waitUntilInitialized();
} else if (timestampAdjuster.getFirstSampleTimestampUs() == TimestampAdjuster.DO_NOT_OFFSET) {
// We're the master and we haven't set the desired first sample timestamp yet.
timestampAdjuster.setFirstSampleTimestampUs(startTimeUs);
}
try {
ExtractorInput input = prepareExtraction(dataSource, loadDataSpec);
if (skipLoadedBytes) {
@ -363,7 +352,7 @@ import java.util.concurrent.atomic.AtomicInteger;
try {
int result = Extractor.RESULT_CONTINUE;
while (result == Extractor.RESULT_CONTINUE && !loadCanceled) {
result = extractor.read(input, null);
result = extractor.read(input, /* seekPosition= */ null);
}
} finally {
nextLoadPosition = (int) (input.getPosition() - dataSpec.absoluteStreamPosition);