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Merge pull request #2468 from danysantiago/dev-v2

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Add Flags to MP3 Extractor to force CBR Seeker
This commit is contained in:
ojw28 2017-02-20 11:21:24 +00:00 committed by GitHub
commit ba0aad4b77
2 changed files with 37 additions and 4 deletions
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39
library/src/main/java/com/google/android/exoplayer2/extractor/mp3/Mp3Extractor.java
View file

@ -31,8 +31,13 @@ import com.google.android.exoplayer2.metadata.Metadata;
import com.google.android.exoplayer2.metadata.id3.Id3Decoder;
import com.google.android.exoplayer2.util.ParsableByteArray;
import com.google.android.exoplayer2.util.Util;
import android.support.annotation.IntDef;
import java.io.EOFException;
import java.io.IOException;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* Extracts data from an MP3 file.
@ -51,6 +56,19 @@ public final class Mp3Extractor implements Extractor {
};
/**
* Flags controlling the behavior of the extractor.
*/
@Retention(RetentionPolicy.SOURCE)
@IntDef(flag = true, value = {FLAG_ENABLE_CONSTANT_BITRATE_SEEKING})
public @interface Flags {}
/**
* Flag to force enable seeking using a constant bitrate assumption in cases where seeking would
* otherwise not be possible.
*/
public static final int FLAG_ENABLE_CONSTANT_BITRATE_SEEKING = 1;
/**
* The maximum number of bytes to search when synchronizing, before giving up.
*/
@ -72,6 +90,9 @@ public final class Mp3Extractor implements Extractor {
private static final int INFO_HEADER = Util.getIntegerCodeForString("Info");
private static final int VBRI_HEADER = Util.getIntegerCodeForString("VBRI");
@Flags
private final int flags;
private final long forcedFirstSampleTimestampUs;
private final ParsableByteArray scratch;
private final MpegAudioHeader synchronizedHeader;
@ -93,16 +114,27 @@ public final class Mp3Extractor implements Extractor {
* Constructs a new {@link Mp3Extractor}.
*/
public Mp3Extractor() {
this(C.TIME_UNSET);
this(0);
}
/**
* Constructs a new {@link Mp3Extractor}.
*
* @param flags Flags that control the extractor's behavior.
*/
public Mp3Extractor(@Flags int flags) {
this(flags, C.TIME_UNSET);
}
/**
* Constructs a new {@link Mp3Extractor}.
*
* @param flags Flags that control the extractor's behavior.
* @param forcedFirstSampleTimestampUs A timestamp to force for the first sample, or
* {@link C#TIME_UNSET} if forcing is not required.
*/
public Mp3Extractor(long forcedFirstSampleTimestampUs) {
public Mp3Extractor(@Flags int flags, long forcedFirstSampleTimestampUs) {
this.flags = flags;
this.forcedFirstSampleTimestampUs = forcedFirstSampleTimestampUs;
scratch = new ParsableByteArray(SCRATCH_LENGTH);
synchronizedHeader = new MpegAudioHeader();
@ -350,7 +382,8 @@ public final class Mp3Extractor implements Extractor {
}
}
if (seeker == null) {
if (seeker == null || (!seeker.isSeekable()
&& (flags & FLAG_ENABLE_CONSTANT_BITRATE_SEEKING) != 0)) {
// Repopulate the synchronized header in case we had to skip an invalid seeking header, which
// would give an invalid CBR bitrate.
input.resetPeekPosition();

2
library/src/main/java/com/google/android/exoplayer2/source/hls/HlsMediaChunk.java
View file

@ -379,7 +379,7 @@ import java.util.concurrent.atomic.AtomicInteger;
|| lastPathSegment.endsWith(EC3_FILE_EXTENSION)) {
extractor = new Ac3Extractor(startTimeUs);
} else if (lastPathSegment.endsWith(MP3_FILE_EXTENSION)) {
extractor = new Mp3Extractor(startTimeUs);
extractor = new Mp3Extractor(0, startTimeUs);
} else {
throw new IllegalArgumentException("Unkown extension for audio file: " + lastPathSegment);
}