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Use AudioFormat within SilenceAudioGenerator.

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PiperOrigin-RevId: 541856580
This commit is contained in:
samrobinson 2023-06-20 11:24:46 +01:00 committed by Ian Baker
parent 2ac5d8f1af
commit 125c39eec3
1 changed files with 13 additions and 8 deletions
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21
libraries/transformer/src/main/java/androidx/media3/transformer/SilentAudioGenerator.java
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@ -26,16 +26,14 @@ import java.util.concurrent.atomic.AtomicLong;
/* package */ final class SilentAudioGenerator {
private static final int DEFAULT_BUFFER_SIZE_FRAMES = 1024;
private final int sampleRate;
private final int frameSize;
private final AudioFormat audioFormat;
private final ByteBuffer internalBuffer;
private final AtomicLong remainingBytesToOutput;
public SilentAudioGenerator(AudioFormat format) {
sampleRate = format.sampleRate;
frameSize = Util.getPcmFrameSize(format.encoding, format.channelCount);
public SilentAudioGenerator(AudioFormat audioFormat) {
this.audioFormat = audioFormat;
internalBuffer =
ByteBuffer.allocateDirect(DEFAULT_BUFFER_SIZE_FRAMES * frameSize)
ByteBuffer.allocateDirect(DEFAULT_BUFFER_SIZE_FRAMES * audioFormat.bytesPerFrame)
.order(ByteOrder.nativeOrder());
internalBuffer.flip();
remainingBytesToOutput = new AtomicLong();
@ -49,8 +47,15 @@ import java.util.concurrent.atomic.AtomicLong;
* @param durationUs The duration of the additional silence to generate, in microseconds.
*/
public void addSilence(long durationUs) {
long outputFrameCount = (sampleRate * durationUs) / C.MICROS_PER_SECOND;
remainingBytesToOutput.addAndGet(frameSize * outputFrameCount);
// The number of frames is not a timestamp, however this utility method provides
// overflow-safe multiplication & division.
long outputFrameCount =
Util.scaleLargeTimestamp(
/* timestamp= */ audioFormat.sampleRate,
/* multiplier= */ durationUs,
/* divisor= */ C.MICROS_PER_SECOND);
remainingBytesToOutput.addAndGet(audioFormat.bytesPerFrame * outputFrameCount);
}
public ByteBuffer getBuffer() {