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Add support for float output in DefaultAudioSink

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Also switch from using MIME types to C.ENCODING_* encodings in DefaultAudioSink.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=175936872
This commit is contained in:
andrewlewis 2017-11-16 01:07:51 -08:00 committed by Oliver Woodman
parent 8537376a2c
commit 15a2f47f31
8 changed files with 121 additions and 109 deletions
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1
RELEASENOTES.md
View File

@ -6,6 +6,7 @@
position, for fast backward seeking. The back-buffer can be configured by
custom `LoadControl` implementations.
* New Cast extension: Simplifies toggling between local and Cast playbacks.
* Support 32-bit PCM float output from `DefaultAudioSink`.
### 2.6.0 ###

10
library/core/src/main/java/com/google/android/exoplayer2/C.java
View File

@ -127,8 +127,8 @@ public final class C {
*/
@Retention(RetentionPolicy.SOURCE)
@IntDef({Format.NO_VALUE, ENCODING_INVALID, ENCODING_PCM_8BIT, ENCODING_PCM_16BIT,
ENCODING_PCM_24BIT, ENCODING_PCM_32BIT, ENCODING_AC3, ENCODING_E_AC3, ENCODING_DTS,
ENCODING_DTS_HD})
ENCODING_PCM_24BIT, ENCODING_PCM_32BIT, ENCODING_PCM_FLOAT, ENCODING_AC3, ENCODING_E_AC3,
ENCODING_DTS, ENCODING_DTS_HD})
public @interface Encoding {}
/**
@ -136,7 +136,7 @@ public final class C {
*/
@Retention(RetentionPolicy.SOURCE)
@IntDef({Format.NO_VALUE, ENCODING_INVALID, ENCODING_PCM_8BIT, ENCODING_PCM_16BIT,
ENCODING_PCM_24BIT, ENCODING_PCM_32BIT})
ENCODING_PCM_24BIT, ENCODING_PCM_32BIT, ENCODING_PCM_FLOAT})
public @interface PcmEncoding {}
/**
* @see AudioFormat#ENCODING_INVALID
@ -158,6 +158,10 @@ public final class C {
* PCM encoding with 32 bits per sample.
*/
public static final int ENCODING_PCM_32BIT = 0x40000000;
/**
* @see AudioFormat#ENCODING_PCM_FLOAT
*/
public static final int ENCODING_PCM_FLOAT = AudioFormat.ENCODING_PCM_FLOAT;
/**
* @see AudioFormat#ENCODING_AC3
*/

30
library/core/src/main/java/com/google/android/exoplayer2/audio/AudioSink.java
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@ -25,14 +25,13 @@ import java.nio.ByteBuffer;
* A sink that consumes audio data.
* <p>
* Before starting playback, specify the input audio format by calling
* {@link #configure(String, int, int, int, int, int[], int, int)}.
* {@link #configure(int, int, int, int, int[], int, int)}.
* <p>
* Call {@link #handleBuffer(ByteBuffer, long)} to write data, and {@link #handleDiscontinuity()}
* when the data being fed is discontinuous. Call {@link #play()} to start playing the written data.
* <p>
* Call {@link #configure(String, int, int, int, int, int[], int, int)} whenever the input format
* changes. The sink will be reinitialized on the next call to
* {@link #handleBuffer(ByteBuffer, long)}.
* Call {@link #configure(int, int, int, int, int[], int, int)} whenever the input format changes.
* The sink will be reinitialized on the next call to {@link #handleBuffer(ByteBuffer, long)}.
* <p>
* Call {@link #reset()} to prepare the sink to receive audio data from a new playback position.
* <p>
@ -166,13 +165,12 @@ public interface AudioSink {
void setListener(Listener listener);
/**
* Returns whether it's possible to play audio in the specified format using encoded audio
* passthrough.
* Returns whether it's possible to play audio in the specified encoding using passthrough.
*
* @param mimeType The format mime type.
* @return Whether it's possible to play audio in the format using encoded audio passthrough.
* @param encoding The audio encoding.
* @return Whether it's possible to play audio in the specified encoding using passthrough.
*/
boolean isPassthroughSupported(String mimeType);
boolean isPassthroughSupported(@C.Encoding int encoding);
/**
* Returns the playback position in the stream starting at zero, in microseconds, or
@ -186,12 +184,9 @@ public interface AudioSink {
/**
* Configures (or reconfigures) the sink.
*
* @param inputMimeType The MIME type of audio data provided in the input buffers.
* @param inputEncoding The encoding of audio data provided in the input buffers.
* @param inputChannelCount The number of channels.
* @param inputSampleRate The sample rate in Hz.
* @param inputPcmEncoding For PCM formats, the encoding used. One of
* {@link C#ENCODING_PCM_16BIT}, {@link C#ENCODING_PCM_16BIT}, {@link C#ENCODING_PCM_24BIT}
* and {@link C#ENCODING_PCM_32BIT}.
* @param specifiedBufferSize A specific size for the playback buffer in bytes, or 0 to infer a
* suitable buffer size.
* @param outputChannels A mapping from input to output channels that is applied to this sink's
@ -205,9 +200,9 @@ public interface AudioSink {
* immediately preceding the next call to {@link #reset()} or this method.
* @throws ConfigurationException If an error occurs configuring the sink.
*/
void configure(String inputMimeType, int inputChannelCount, int inputSampleRate,
@C.PcmEncoding int inputPcmEncoding, int specifiedBufferSize, @Nullable int[] outputChannels,
int trimStartSamples, int trimEndSamples) throws ConfigurationException;
void configure(@C.Encoding int inputEncoding, int inputChannelCount, int inputSampleRate,
int specifiedBufferSize, @Nullable int[] outputChannels, int trimStartSamples,
int trimEndSamples) throws ConfigurationException;
/**
* Starts or resumes consuming audio if initialized.
@ -228,8 +223,7 @@ public interface AudioSink {
* Returns whether the data was handled in full. If the data was not handled in full then the same
* {@link ByteBuffer} must be provided to subsequent calls until it has been fully consumed,
* except in the case of an intervening call to {@link #reset()} (or to
* {@link #configure(String, int, int, int, int, int[], int, int)} that causes the sink to be
* reset).
* {@link #configure(int, int, int, int, int[], int, int)} that causes the sink to be reset).
*
* @param buffer The buffer containing audio data.
* @param presentationTimeUs The presentation timestamp of the buffer in microseconds.

134
library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java
View File

@ -29,7 +29,6 @@ import android.util.Log;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.PlaybackParameters;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.MimeTypes;
import com.google.android.exoplayer2.util.Util;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
@ -182,13 +181,13 @@ public final class DefaultAudioSink implements AudioSink {
*/
private AudioTrack keepSessionIdAudioTrack;
private AudioTrack audioTrack;
private boolean isInputPcm;
private int inputSampleRate;
private int sampleRate;
private int channelConfig;
private @C.Encoding int encoding;
private @C.Encoding int outputEncoding;
private AudioAttributes audioAttributes;
private boolean passthrough;
private boolean processingEnabled;
private int bufferSize;
private long bufferSizeUs;
@ -286,9 +285,8 @@ public final class DefaultAudioSink implements AudioSink {
}
@Override
public boolean isPassthroughSupported(String mimeType) {
return audioCapabilities != null
&& audioCapabilities.supportsEncoding(getEncodingForMimeType(mimeType));
public boolean isPassthroughSupported(@C.Encoding int encoding) {
return audioCapabilities != null && audioCapabilities.supportsEncoding(encoding);
}
@Override
@ -331,18 +329,20 @@ public final class DefaultAudioSink implements AudioSink {
}
@Override
public void configure(String inputMimeType, int inputChannelCount, int inputSampleRate,
@C.PcmEncoding int inputPcmEncoding, int specifiedBufferSize, @Nullable int[] outputChannels,
int trimStartSamples, int trimEndSamples) throws ConfigurationException {
public void configure(@C.Encoding int inputEncoding, int inputChannelCount, int inputSampleRate,
int specifiedBufferSize, @Nullable int[] outputChannels, int trimStartSamples,
int trimEndSamples) throws ConfigurationException {
boolean flush = false;
this.inputSampleRate = inputSampleRate;
int channelCount = inputChannelCount;
int sampleRate = inputSampleRate;
@C.Encoding int encoding;
boolean passthrough = !MimeTypes.AUDIO_RAW.equals(inputMimeType);
boolean flush = false;
if (!passthrough) {
encoding = inputPcmEncoding;
pcmFrameSize = Util.getPcmFrameSize(inputPcmEncoding, channelCount);
isInputPcm = isEncodingPcm(inputEncoding);
if (isInputPcm) {
pcmFrameSize = Util.getPcmFrameSize(inputEncoding, channelCount);
}
@C.Encoding int encoding = inputEncoding;
boolean processingEnabled = isInputPcm && inputEncoding != C.ENCODING_PCM_FLOAT;
if (processingEnabled) {
trimmingAudioProcessor.setTrimSampleCount(trimStartSamples, trimEndSamples);
channelMappingAudioProcessor.setChannelMap(outputChannels);
for (AudioProcessor audioProcessor : availableAudioProcessors) {
@ -360,8 +360,6 @@ public final class DefaultAudioSink implements AudioSink {
if (flush) {
resetAudioProcessors();
}
} else {
encoding = getEncodingForMimeType(inputMimeType);
}
int channelConfig;
@ -411,11 +409,11 @@ public final class DefaultAudioSink implements AudioSink {
// Workaround for Nexus Player not reporting support for mono passthrough.
// (See [Internal: b/34268671].)
if (Util.SDK_INT <= 25 && "fugu".equals(Util.DEVICE) && passthrough && channelCount == 1) {
if (Util.SDK_INT <= 25 && "fugu".equals(Util.DEVICE) && !isInputPcm && channelCount == 1) {
channelConfig = AudioFormat.CHANNEL_OUT_STEREO;
}
if (!flush && isInitialized() && this.encoding == encoding && this.sampleRate == sampleRate
if (!flush && isInitialized() && outputEncoding == encoding && this.sampleRate == sampleRate
&& this.channelConfig == channelConfig) {
// We already have an audio track with the correct sample rate, channel config and encoding.
return;
@ -423,16 +421,24 @@ public final class DefaultAudioSink implements AudioSink {
reset();
this.encoding = encoding;
this.passthrough = passthrough;
this.processingEnabled = processingEnabled;
this.sampleRate = sampleRate;
this.channelConfig = channelConfig;
outputEncoding = passthrough ? encoding : C.ENCODING_PCM_16BIT;
outputPcmFrameSize = Util.getPcmFrameSize(C.ENCODING_PCM_16BIT, channelCount);
outputEncoding = encoding;
if (isInputPcm) {
outputPcmFrameSize = Util.getPcmFrameSize(outputEncoding, channelCount);
}
if (specifiedBufferSize != 0) {
bufferSize = specifiedBufferSize;
} else if (passthrough) {
} else if (isInputPcm) {
int minBufferSize = AudioTrack.getMinBufferSize(sampleRate, channelConfig, outputEncoding);
Assertions.checkState(minBufferSize != ERROR_BAD_VALUE);
int multipliedBufferSize = minBufferSize * BUFFER_MULTIPLICATION_FACTOR;
int minAppBufferSize = (int) durationUsToFrames(MIN_BUFFER_DURATION_US) * outputPcmFrameSize;
int maxAppBufferSize = (int) Math.max(minBufferSize,
durationUsToFrames(MAX_BUFFER_DURATION_US) * outputPcmFrameSize);
bufferSize = Util.constrainValue(multipliedBufferSize, minAppBufferSize, maxAppBufferSize);
} else {
// TODO: Set the minimum buffer size using getMinBufferSize when it takes the encoding into
// account. [Internal: b/25181305]
if (outputEncoding == C.ENCODING_AC3 || outputEncoding == C.ENCODING_E_AC3) {
@ -442,21 +448,9 @@ public final class DefaultAudioSink implements AudioSink {
// DTS allows an 'open' bitrate, but we assume the maximum listed value: 1536 kbit/s.
bufferSize = (int) (PASSTHROUGH_BUFFER_DURATION_US * 192 * 1024 / C.MICROS_PER_SECOND);
}
} else {
int minBufferSize = AudioTrack.getMinBufferSize(sampleRate, channelConfig, outputEncoding);
Assertions.checkState(minBufferSize != ERROR_BAD_VALUE);
int multipliedBufferSize = minBufferSize * BUFFER_MULTIPLICATION_FACTOR;
int minAppBufferSize = (int) durationUsToFrames(MIN_BUFFER_DURATION_US) * outputPcmFrameSize;
int maxAppBufferSize = (int) Math.max(minBufferSize,
durationUsToFrames(MAX_BUFFER_DURATION_US) * outputPcmFrameSize);
bufferSize = multipliedBufferSize < minAppBufferSize ? minAppBufferSize
: multipliedBufferSize > maxAppBufferSize ? maxAppBufferSize
: multipliedBufferSize;
}
bufferSizeUs = passthrough ? C.TIME_UNSET : framesToDurationUs(bufferSize / outputPcmFrameSize);
// The old playback parameters may no longer be applicable so try to reset them now.
setPlaybackParameters(playbackParameters);
bufferSizeUs =
isInputPcm ? framesToDurationUs(bufferSize / outputPcmFrameSize) : C.TIME_UNSET;
}
private void resetAudioProcessors() {
@ -487,6 +481,10 @@ public final class DefaultAudioSink implements AudioSink {
releasingConditionVariable.block();
audioTrack = initializeAudioTrack();
// The old playback parameters may no longer be applicable so try to reset them now.
setPlaybackParameters(playbackParameters);
int audioSessionId = audioTrack.getAudioSessionId();
if (enablePreV21AudioSessionWorkaround) {
if (Util.SDK_INT < 21) {
@ -574,7 +572,7 @@ public final class DefaultAudioSink implements AudioSink {
return true;
}
if (passthrough && framesPerEncodedSample == 0) {
if (!isInputPcm && framesPerEncodedSample == 0) {
// If this is the first encoded sample, calculate the sample size in frames.
framesPerEncodedSample = getFramesPerEncodedSample(outputEncoding, buffer);
}
@ -618,20 +616,19 @@ public final class DefaultAudioSink implements AudioSink {
}
}
if (passthrough) {
submittedEncodedFrames += framesPerEncodedSample;
} else {
if (isInputPcm) {
submittedPcmBytes += buffer.remaining();
} else {
submittedEncodedFrames += framesPerEncodedSample;
}
inputBuffer = buffer;
}
if (passthrough) {
// Passthrough buffers are not processed.
writeBuffer(inputBuffer, presentationTimeUs);
} else {
if (processingEnabled) {
processBuffers(presentationTimeUs);
} else {
writeBuffer(inputBuffer, presentationTimeUs);
}
if (!inputBuffer.hasRemaining()) {
@ -679,10 +676,9 @@ public final class DefaultAudioSink implements AudioSink {
}
@SuppressWarnings("ReferenceEquality")
private boolean writeBuffer(ByteBuffer buffer, long avSyncPresentationTimeUs)
throws WriteException {
private void writeBuffer(ByteBuffer buffer, long avSyncPresentationTimeUs) throws WriteException {
if (!buffer.hasRemaining()) {
return true;
return;
}
if (outputBuffer != null) {
Assertions.checkArgument(outputBuffer == buffer);
@ -701,7 +697,7 @@ public final class DefaultAudioSink implements AudioSink {
}
int bytesRemaining = buffer.remaining();
int bytesWritten = 0;
if (Util.SDK_INT < 21) { // passthrough == false
if (Util.SDK_INT < 21) { // isInputPcm == true
// Work out how many bytes we can write without the risk of blocking.
int bytesPending =
(int) (writtenPcmBytes - (audioTrackUtil.getPlaybackHeadPosition() * outputPcmFrameSize));
@ -728,17 +724,15 @@ public final class DefaultAudioSink implements AudioSink {
throw new WriteException(bytesWritten);
}
if (!passthrough) {
if (isInputPcm) {
writtenPcmBytes += bytesWritten;
}
if (bytesWritten == bytesRemaining) {
if (passthrough) {
if (!isInputPcm) {
writtenEncodedFrames += framesPerEncodedSample;
}
outputBuffer = null;
return true;
}
return false;
}
@Override
@ -758,7 +752,7 @@ public final class DefaultAudioSink implements AudioSink {
private boolean drainAudioProcessorsToEndOfStream() throws WriteException {
boolean audioProcessorNeedsEndOfStream = false;
if (drainingAudioProcessorIndex == C.INDEX_UNSET) {
drainingAudioProcessorIndex = passthrough ? audioProcessors.length : 0;
drainingAudioProcessorIndex = processingEnabled ? 0 : audioProcessors.length;
audioProcessorNeedsEndOfStream = true;
}
while (drainingAudioProcessorIndex < audioProcessors.length) {
@ -799,8 +793,8 @@ public final class DefaultAudioSink implements AudioSink {
@Override
public PlaybackParameters setPlaybackParameters(PlaybackParameters playbackParameters) {
if (passthrough) {
// The playback parameters are always the default in passthrough mode.
if (isInitialized() && !processingEnabled) {
// The playback parameters are always the default if processing is disabled.
this.playbackParameters = PlaybackParameters.DEFAULT;
return this.playbackParameters;
}
@ -1076,7 +1070,7 @@ public final class DefaultAudioSink implements AudioSink {
audioTimestampSet = false;
}
}
if (getLatencyMethod != null && !passthrough) {
if (getLatencyMethod != null && isInputPcm) {
try {
// Compute the audio track latency, excluding the latency due to the buffer (leaving
// latency due to the mixer and audio hardware driver).
@ -1115,11 +1109,11 @@ public final class DefaultAudioSink implements AudioSink {
}
private long getSubmittedFrames() {
return passthrough ? submittedEncodedFrames : (submittedPcmBytes / pcmFrameSize);
return isInputPcm ? (submittedPcmBytes / pcmFrameSize) : submittedEncodedFrames;
}
private long getWrittenFrames() {
return passthrough ? writtenEncodedFrames : (writtenPcmBytes / outputPcmFrameSize);
return isInputPcm ? (writtenPcmBytes / outputPcmFrameSize) : writtenEncodedFrames;
}
private void resetSyncParams() {
@ -1212,20 +1206,10 @@ public final class DefaultAudioSink implements AudioSink {
MODE_STATIC, audioSessionId);
}
@C.Encoding
private static int getEncodingForMimeType(String mimeType) {
switch (mimeType) {
case MimeTypes.AUDIO_AC3:
return C.ENCODING_AC3;
case MimeTypes.AUDIO_E_AC3:
return C.ENCODING_E_AC3;
case MimeTypes.AUDIO_DTS:
return C.ENCODING_DTS;
case MimeTypes.AUDIO_DTS_HD:
return C.ENCODING_DTS_HD;
default:
return C.ENCODING_INVALID;
}
private static boolean isEncodingPcm(@C.Encoding int encoding) {
return encoding == C.ENCODING_PCM_8BIT || encoding == C.ENCODING_PCM_16BIT
|| encoding == C.ENCODING_PCM_24BIT || encoding == C.ENCODING_PCM_32BIT
|| encoding == C.ENCODING_PCM_FLOAT;
}
private static int getFramesPerEncodedSample(@C.Encoding int encoding, ByteBuffer buffer) {

20
library/core/src/main/java/com/google/android/exoplayer2/audio/MediaCodecAudioRenderer.java
View File

@ -51,6 +51,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
private boolean passthroughEnabled;
private boolean codecNeedsDiscardChannelsWorkaround;
private android.media.MediaFormat passthroughMediaFormat;
@C.Encoding
private int pcmEncoding;
private int channelCount;
private int encoderDelay;
@ -226,7 +227,7 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
* @return Whether passthrough playback is supported.
*/
protected boolean allowPassthrough(String mimeType) {
return audioSink.isPassthroughSupported(mimeType);
return audioSink.isPassthroughSupported(MimeTypes.getEncoding(mimeType));
}
@Override
@ -272,10 +273,15 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
@Override
protected void onOutputFormatChanged(MediaCodec codec, MediaFormat outputFormat)
throws ExoPlaybackException {
boolean passthrough = passthroughMediaFormat != null;
String mimeType = passthrough ? passthroughMediaFormat.getString(MediaFormat.KEY_MIME)
: MimeTypes.AUDIO_RAW;
MediaFormat format = passthrough ? passthroughMediaFormat : outputFormat;
@C.Encoding int encoding;
MediaFormat format;
if (passthroughMediaFormat != null) {
encoding = MimeTypes.getEncoding(passthroughMediaFormat.getString(MediaFormat.KEY_MIME));
format = passthroughMediaFormat;
} else {
encoding = pcmEncoding;
format = outputFormat;
}
int channelCount = format.getInteger(MediaFormat.KEY_CHANNEL_COUNT);
int sampleRate = format.getInteger(MediaFormat.KEY_SAMPLE_RATE);
int[] channelMap;
@ -289,8 +295,8 @@ public class MediaCodecAudioRenderer extends MediaCodecRenderer implements Media
}
try {
audioSink.configure(mimeType, channelCount, sampleRate, pcmEncoding, 0, channelMap,
encoderDelay, encoderPadding);
audioSink.configure(encoding, channelCount, sampleRate, 0, channelMap, encoderDelay,
encoderPadding);
} catch (AudioSink.ConfigurationException e) {
throw ExoPlaybackException.createForRenderer(e, getIndex());
}

4
library/core/src/main/java/com/google/android/exoplayer2/audio/SimpleDecoderAudioRenderer.java
View File

@ -329,8 +329,8 @@ public abstract class SimpleDecoderAudioRenderer extends BaseRenderer implements
if (audioTrackNeedsConfigure) {
Format outputFormat = getOutputFormat();
audioSink.configure(outputFormat.sampleMimeType, outputFormat.channelCount,
outputFormat.sampleRate, outputFormat.pcmEncoding, 0, null, encoderDelay, encoderPadding);
audioSink.configure(outputFormat.pcmEncoding, outputFormat.channelCount,
outputFormat.sampleRate, 0, null, encoderDelay, encoderPadding);
audioTrackNeedsConfigure = false;
}

30
library/core/src/main/java/com/google/android/exoplayer2/util/MimeTypes.java
View File

@ -208,12 +208,12 @@ public final class MimeTypes {
}
/**
* Returns the {@link C}{@code .TRACK_TYPE_*} constant that corresponds to a specified mime type.
* {@link C#TRACK_TYPE_UNKNOWN} if the mime type is not known or the mapping cannot be
* Returns the {@link C}{@code .TRACK_TYPE_*} constant that corresponds to a specified MIME type.
* {@link C#TRACK_TYPE_UNKNOWN} if the MIME type is not known or the mapping cannot be
* established.
*
* @param mimeType The mimeType.
* @return The {@link C}{@code .TRACK_TYPE_*} constant that corresponds to a specified mime type.
* @param mimeType The MIME type.
* @return The {@link C}{@code .TRACK_TYPE_*} constant that corresponds to a specified MIME type.
*/
public static int getTrackType(String mimeType) {
if (TextUtils.isEmpty(mimeType)) {
@ -239,6 +239,28 @@ public final class MimeTypes {
}
}
/**
* Returns the {@link C}{@code .ENCODING_*} constant that corresponds to a specified MIME type, or
* {@link C#ENCODING_INVALID} if the mapping cannot be established.
*
* @param mimeType The MIME type.
* @return The {@link C}{@code .ENCODING_*} constant that corresponds to a specified MIME type.
*/
public static @C.Encoding int getEncoding(String mimeType) {
switch (mimeType) {
case MimeTypes.AUDIO_AC3:
return C.ENCODING_AC3;
case MimeTypes.AUDIO_E_AC3:
return C.ENCODING_E_AC3;
case MimeTypes.AUDIO_DTS:
return C.ENCODING_DTS;
case MimeTypes.AUDIO_DTS_HD:
return C.ENCODING_DTS_HD;
default:
return C.ENCODING_INVALID;
}
}
/**
* Equivalent to {@code getTrackType(getMediaMimeType(codec))}.
*

1
library/core/src/main/java/com/google/android/exoplayer2/util/Util.java
View File

@ -826,6 +826,7 @@ public final class Util {
case C.ENCODING_PCM_24BIT:
return channelCount * 3;
case C.ENCODING_PCM_32BIT:
case C.ENCODING_PCM_FLOAT:
return channelCount * 4;
default:
throw new IllegalArgumentException();