DrKLO/Telegram · warning · UnhandledAudioFormatException

Unhandled format: {inputAudioFormat}

Error message

Unhandled format: {inputAudioFormat}

What it means

SonicAudioProcessor.configure throws UnhandledAudioFormatException when the input encoding is not C.ENCODING_PCM_16BIT. Sonic (used for speed/pitch/time-stretch and sample-rate conversion via the Sonic library) operates internally on 16-bit PCM samples; non-16-bit encodings cannot be processed directly and are rejected at configuration so the pipeline can convert or bypass.

Source

Thrown at TMessagesProj/src/main/java/com/google/android/exoplayer2/audio/SonicAudioProcessor.java:147

  public long getMediaDuration(long playoutDuration) {
    if (outputBytes >= MIN_BYTES_FOR_DURATION_SCALING_CALCULATION) {
      long processedInputBytes = inputBytes - checkNotNull(sonic).getPendingInputBytes();
      return outputAudioFormat.sampleRate == inputAudioFormat.sampleRate
          ? Util.scaleLargeTimestamp(playoutDuration, processedInputBytes, outputBytes)
          : Util.scaleLargeTimestamp(
              playoutDuration,
              processedInputBytes * outputAudioFormat.sampleRate,
              outputBytes * inputAudioFormat.sampleRate);
    } else {
      return (long) ((double) speed * playoutDuration);
    }
  }

  @Override
  @CanIgnoreReturnValue
  public AudioFormat configure(AudioFormat inputAudioFormat) throws UnhandledAudioFormatException {
    if (inputAudioFormat.encoding != C.ENCODING_PCM_16BIT) {
      throw new UnhandledAudioFormatException(inputAudioFormat);
    }
    int outputSampleRateHz =
        pendingOutputSampleRate == SAMPLE_RATE_NO_CHANGE
            ? inputAudioFormat.sampleRate
            : pendingOutputSampleRate;
    pendingInputAudioFormat = inputAudioFormat;
    pendingOutputAudioFormat =
        new AudioFormat(outputSampleRateHz, inputAudioFormat.channelCount, C.ENCODING_PCM_16BIT);
    pendingSonicRecreation = true;
    return pendingOutputAudioFormat;
  }

  @Override
  public boolean isActive() {
    return pendingOutputAudioFormat.sampleRate != Format.NO_VALUE
        && (Math.abs(speed - 1f) >= CLOSE_THRESHOLD
            || Math.abs(pitch - 1f) >= CLOSE_THRESHOLD
            || pendingOutputAudioFormat.sampleRate != pendingInputAudioFormat.sampleRate);

View on GitHub (pinned to 45ab8f4308)

Solutions

1. Place a ResamplingAudioProcessor (or FloatResamplingAudioProcessor then a down-converter) upstream so input to Sonic is 16-bit PCM.
2. Only activate Sonic (set pending output sample rate / speed) when the source is 16-bit PCM; otherwise bypass by leaving speed at 1.0 and sample rate at SAMPLE_RATE_NO_CHANGE.
3. Configure DefaultAudioSink with an audio processor chain order that converts to 16-bit before Sonic.

Example fix

// before
sonicProcessor.setOutputSampleRate(48000);
sonicProcessor.setSpeed(1.5f); // 24-bit source -> configure throws
// after: resample to 16-bit first, then Sonic
AudioProcessor[] chain = { resamplingTo16BitProcessor, sonicProcessor };
sink = new DefaultAudioSink(..., new DefaultAudioSink.DefaultAudioProcessorChain(chain));

if (inputAudioFormat.encoding == C.ENCODING_PCM_16BIT) {
  sonicProcessor.setOutputSampleRate(48000);
  sonicProcessor.setSpeed(1.5f);
} else {
  // resample to 16-bit upstream, or leave Sonic inactive
}

try {
  sonicProcessor.configure(inputAudioFormat);
} catch (UnhandledAudioFormatException e) {
  sonicProcessor.setSpeed(1.0f); // disable, or resample input to 16-bit first
}

When it happens

Trigger: Setting playback speed/pitch or an output sample rate on SonicAudioProcessor while the input is non-16-bit PCM (24-bit, 32-bit, float, compressed); a hi-res source routed through the default speed-adjustment chain; toggling playback speed on a float-PCM decoder output.

Common situations: Variable-speed playback enabled app-wide; hi-res FLAC or float-decoded audio reaching the Sonic processor; a custom audio sink that always includes Sonic for speed control regardless of encoding.

Related errors

• Unhandled format: {inputAudioFormat}
• Unhandled format: {inputAudioFormat}
• Unhandled format: {inputAudioFormat}
• Unhandled format: {inputAudioFormat}
• Invalid output encoding (mode={outputMode}) for: {inputForma

AI-assisted analysis of DrKLO/Telegram@45ab8f4308 (2026-08-14). Data as JSON: /api/errors/c252ae9d07b843e5. Report an issue: GitHub.