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/**
* Copyright 2013-2023 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.common.av;
/**
* Specifies the linear audio PCM format.
*/
public class AudioFormat {
/**
* @param sampleRate sample rate in Hz (1/s), e.g. 44100 Hz
* @param sampleSize sample size in bits, e.g. 16 bits
* @param channelCount number of channels, e.g. 2 channels for stereo
* @param signed true if signed PCM values, false for unsigned values
* @param fixedP true for fixed point values, false for unsigned floating point values with a sampleSize of 32 (float) or 64 (double)
* @param planar true for planar data package (each channel in own data buffer), false for packed data channels interleaved in one buffer.
* @param littleEndian true for little-endian byte order, false for big endian byte order
*/
public AudioFormat(final int sampleRate, final int sampleSize, final int channelCount, final boolean signed, final boolean fixedP, final boolean planar, final boolean littleEndian) {
this.sampleRate = sampleRate;
this.sampleSize = sampleSize;
this.channelCount = channelCount;
this.signed = signed;
this.fixedP = fixedP;
this.planar = planar;
this.littleEndian = littleEndian;
if( !fixedP ) {
if( sampleSize != 32 && sampleSize != 64 ) {
throw new IllegalArgumentException("Floating point: sampleSize "+sampleSize+" bits");
}
if( !signed ) {
throw new IllegalArgumentException("Floating point: unsigned");
}
}
}
/** Sample rate in Hz (1/s, e.g. 44100 Hz. */
public final int sampleRate;
/** Sample size in bits, e.g. 16 bits. */
public final int sampleSize;
/** Number of channels, e.g. 2 channels for stereo. */
public final int channelCount;
/** Signed PCM values if true, otherwise unsigned values. */
public final boolean signed;
/** Fixed or floating point values. Floating point 'float' has {@link #sampleSize} 32, 'double' has {@link #sampleSize} 64. */
public final boolean fixedP;
/** Planar or packed samples. If planar, each channel has their own data buffer. If packed, channel data is interleaved in one buffer. */
public final boolean planar;
/** Little-endian byte order if true, otherwise big endian byte order. */
public final boolean littleEndian;
//
// Time <-> Bytes
//
/**
* Returns the byte size of the given milliseconds
* according to {@link #sampleSize}, {@link #channelCount} and {@link #sampleRate}.
* <p>
* Time -> Byte Count
* </p>
*/
public final int getDurationsByteSize(final int millisecs) {
final int bytesPerSample = sampleSize >>> 3; // /8
return Math.round( millisecs * ( (float)channelCount * (float)bytesPerSample * ( sampleRate / 1000f ) ) );
}
/**
* Returns the duration in milliseconds of the given byte count
* according to {@link #sampleSize}, {@link #channelCount} and {@link #sampleRate}.
* <p>
* Byte Count -> Time
* </p>
*/
public final int getBytesDuration(final int byteCount) {
final int bytesPerSample = sampleSize >>> 3; // /8
return Math.round( byteCount / ( (float)channelCount * (float)bytesPerSample * ( sampleRate / 1000f ) ) );
}
/**
* Returns the duration in milliseconds of the given sample count per frame and channel
* according to the {@link #sampleRate}, i.e.
* <pre>
* round( ( 1000f * sampleCount ) / sampleRate )
* </pre>
* <p>
* Sample Count -> Time
* </p>
* @param sampleCount sample count per frame and channel
*/
public final int getSamplesDuration(final int sampleCount) {
return Math.round( ( 1000f * sampleCount ) / sampleRate );
}
/**
* Returns the rounded frame count of the given milliseconds and frame duration.
* <pre>
* Math.max( 1, millisecs / frameDuration + 0.5f )
* </pre>
* <p>
* Note: <code>frameDuration</code> can be derived by <i>sample count per frame and channel</i>
* via {@link #getSamplesDuration(int)} or by <i>byte count</i> via {@link #getBytesDuration(int)}.
* </p>
* <p>
* Frame Time -> Frame Count
* </p>
* @param millisecs time in milliseconds
* @param frameDuration duration per frame in milliseconds.
* @see #getSamplesDuration(int)
* @see #getBytesDuration(int)
*/
public final int getFrameCount(final int millisecs, final int frameDuration) {
return Math.max(1, (int) ( (float)millisecs / (float)frameDuration + 0.5f ));
}
/**
* Returns the byte size of given sample count
* according to the {@link #sampleSize}, i.e.:
* <pre>
* sampleCount * ( sampleSize / 8 )
* </pre>
* <p>
* Note: To retrieve the byte size for all channels,
* you need to pre-multiply <code>sampleCount</code> with {@link #channelCount}.
* </p>
* <p>
* Sample Count -> Byte Count
* </p>
* @param sampleCount sample count
*/
public final int getSamplesByteCount(final int sampleCount) {
return sampleCount * ( sampleSize >>> 3 );
}
/**
* Returns the sample count of given byte count
* according to the {@link #sampleSize}, i.e.:
* <pre>
* ( byteCount * 8 ) / sampleSize
* </pre>
* <p>
* Note: If <code>byteCount</code> covers all channels and you request the sample size per channel,
* you need to divide the result by <code>sampleCount</code> by {@link #channelCount}.
* </p>
* <p>
* Byte Count -> Sample Count
* </p>
* @param byteCount number of bytes
*/
public final int getBytesSampleCount(final int byteCount) {
return ( byteCount << 3 ) / sampleSize;
}
@Override
public String toString() {
return "AudioFormat[sampleRate "+sampleRate+", sampleSize "+sampleSize+", channelCount "+channelCount+
", signed "+signed+", fixedP "+fixedP+", "+(planar?"planar":"packed")+", "+(littleEndian?"little":"big")+"-endian]"; }
}
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