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Define a interface type for Aac object type.

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PiperOrigin-RevId: 308115863
This commit is contained in:
krocard 2020-04-23 21:20:02 +01:00 committed by Ian Baker
parent e250fe6277
commit d01d0cfd4b
1 changed files with 29 additions and 7 deletions
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36
library/common/src/main/java/com/google/android/exoplayer2/audio/AacUtil.java
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@ -15,11 +15,15 @@
*/ */
package com.google.android.exoplayer2.audio; package com.google.android.exoplayer2.audio;
import androidx.annotation.IntDef;
import com.google.android.exoplayer2.C; import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.ParserException; import com.google.android.exoplayer2.ParserException;
import com.google.android.exoplayer2.util.Assertions; import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.Log; import com.google.android.exoplayer2.util.Log;
import com.google.android.exoplayer2.util.ParsableBitArray; import com.google.android.exoplayer2.util.ParsableBitArray;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/** Utility methods for handling AAC audio streams. */ /** Utility methods for handling AAC audio streams. */
public final class AacUtil { public final class AacUtil {
@ -132,19 +136,37 @@ public final class AacUtil {
private static final String CODECS_STRING_PREFIX = "mp4a.40."; private static final String CODECS_STRING_PREFIX = "mp4a.40.";
// Advanced Audio Coding Low-Complexity profile. // Advanced Audio Coding Low-Complexity profile.
private static final int AUDIO_OBJECT_TYPE_AAC_LC = 2; public static final int AUDIO_OBJECT_TYPE_AAC_LC = 2;
// Spectral Band Replication. // Spectral Band Replication.
private static final int AUDIO_OBJECT_TYPE_AAC_SBR = 5; public static final int AUDIO_OBJECT_TYPE_AAC_SBR = 5;
// Error Resilient Bit-Sliced Arithmetic Coding. // Error Resilient Bit-Sliced Arithmetic Coding.
private static final int AUDIO_OBJECT_TYPE_AAC_ER_BSAC = 22; public static final int AUDIO_OBJECT_TYPE_AAC_ER_BSAC = 22;
// Enhanced low delay. // Enhanced low delay.
private static final int AUDIO_OBJECT_TYPE_AAC_ELD = 23; public static final int AUDIO_OBJECT_TYPE_AAC_ELD = 23;
// Parametric Stereo. // Parametric Stereo.
private static final int AUDIO_OBJECT_TYPE_AAC_PS = 29; public static final int AUDIO_OBJECT_TYPE_AAC_PS = 29;
// Escape code for extended audio object types. // Escape code for extended audio object types.
private static final int AUDIO_OBJECT_TYPE_ESCAPE = 31; private static final int AUDIO_OBJECT_TYPE_ESCAPE = 31;
// Extended high efficiency. // Extended high efficiency.
private static final int AUDIO_OBJECT_TYPE_AAC_XHE = 42; public static final int AUDIO_OBJECT_TYPE_AAC_XHE = 42;
/**
* Valid AAC Audio object types. One of {@link #AUDIO_OBJECT_TYPE_AAC_LC}, {@link
* #AUDIO_OBJECT_TYPE_AAC_SBR}, {@link #AUDIO_OBJECT_TYPE_AAC_ER_BSAC}, {@link
* #AUDIO_OBJECT_TYPE_AAC_ELD}, {@link #AUDIO_OBJECT_TYPE_AAC_PS} or {@link
* #AUDIO_OBJECT_TYPE_AAC_XHE}.
*/
@Documented
@Retention(RetentionPolicy.SOURCE)
@IntDef({
AUDIO_OBJECT_TYPE_AAC_LC,
AUDIO_OBJECT_TYPE_AAC_SBR,
AUDIO_OBJECT_TYPE_AAC_ER_BSAC,
AUDIO_OBJECT_TYPE_AAC_ELD,
AUDIO_OBJECT_TYPE_AAC_PS,
AUDIO_OBJECT_TYPE_AAC_XHE
})
public @interface AacAudioObjectType {}
/** /**
* Parses an AAC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1 * Parses an AAC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1
@ -275,7 +297,7 @@ public final class AacUtil {
/** Returns the encoding for a given AAC audio object type. */ /** Returns the encoding for a given AAC audio object type. */
@C.Encoding @C.Encoding
public static int getEncodingForAudioObjectType(int audioObjectType) { public static int getEncodingForAudioObjectType(@AacAudioObjectType int audioObjectType) {
switch (audioObjectType) { switch (audioObjectType) {
case AUDIO_OBJECT_TYPE_AAC_LC: case AUDIO_OBJECT_TYPE_AAC_LC:
return C.ENCODING_AAC_LC; return C.ENCODING_AAC_LC;