PcmAudioUtil

Artifact: androidx.media3:media3-exoplayer

Kotlin |Java

@UnstableApi
public final class PcmAudioUtil

Utility methods for PCM audio data.

Summary

Public methods
`static ByteBuffer`	`rampUpVolume( ByteBuffer buffer, @C.Encoding int pcmEncoding, int pcmFrameSize, int startFrameIndex, int rampFrameCount )` Returns a new `ByteBuffer` with linear volume ramping applied.
`static int`	`readAs32BitIntPcm(ByteBuffer buffer, @C.Encoding int pcmEncoding)` Reads a single-channel PCM value from the buffer and returns it as a 32-bit integer PCM value.
`static void`	`write32BitIntPcm( ByteBuffer buffer, int pcm32bit, @C.Encoding int pcmEncoding )` Writes a 32-bit integer PCM value to a buffer in the given target PCM encoding.

Public methods

rampUpVolume

public static ByteBuffer rampUpVolume(
    ByteBuffer buffer,
    @C.Encoding int pcmEncoding,
    int pcmFrameSize,
    int startFrameIndex,
    int rampFrameCount
)

Returns a new ByteBuffer with linear volume ramping applied.

Parameters
`ByteBuffer buffer`	The input buffer containing PCM frames. The buffer will be fully consumed by this method.
`@C.Encoding int pcmEncoding`	The `C.Encoding` of the PCM frames.
`int pcmFrameSize`	The overall frame size of one PCM frame (including all channels).
`int startFrameIndex`	The index of the first frame within the audio ramp duration (as specified by `rampFrameCount`).
`int rampFrameCount`	The overall ramp duration in number of frames.

Returns
`ByteBuffer`	The `ByteBuffer` containing the modified PCM data.

readAs32BitIntPcm

public static int readAs32BitIntPcm(ByteBuffer buffer, @C.Encoding int pcmEncoding)

Reads a single-channel PCM value from the buffer and returns it as a 32-bit integer PCM value.

Parameters
`ByteBuffer buffer`	The `ByteBuffer` to read from.
`@C.Encoding int pcmEncoding`	The `C.Encoding` of the PCM data in the buffer.

Returns
`int`	The 32-bit PCM value of the read buffer.

write32BitIntPcm

public static void write32BitIntPcm(
    ByteBuffer buffer,
    int pcm32bit,
    @C.Encoding int pcmEncoding
)

Writes a 32-bit integer PCM value to a buffer in the given target PCM encoding.

Parameters
`ByteBuffer buffer`	The `ByteBuffer` to write to.
`int pcm32bit`	The 32-bit PCM value.
`@C.Encoding int pcmEncoding`	The target `C.Encoding` of the PCM data in the buffer.