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add support in mediacodecaudiorenderer for 24bit pcm to float #3635
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194 changes: 194 additions & 0 deletions
194
...core/src/main/java/com/google/android/exoplayer2/audio/FloatResamplingAudioProcessor.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| /* | ||
| * Copyright (C) 2018 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.google.android.exoplayer2.audio; | ||
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| import com.google.android.exoplayer2.C; | ||
| import com.google.android.exoplayer2.Format; | ||
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| import java.nio.ByteBuffer; | ||
| import java.nio.ByteOrder; | ||
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| /** | ||
| * An {@link AudioProcessor} that converts audio data to {@link C#ENCODING_PCM_16BIT}. | ||
| */ | ||
| /* package */ final class FloatResamplingAudioProcessor implements AudioProcessor { | ||
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| private int sampleRateHz; | ||
| private static final double PCM_INT32_FLOAT = 1.0 / 0x7fffffff; | ||
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| private int channelCount; | ||
| @C.PcmEncoding | ||
| private int sourceEncoding; | ||
| private ByteBuffer buffer; | ||
| private ByteBuffer outputBuffer; | ||
| private boolean inputEnded; | ||
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| /** | ||
| * Creates a new audio processor that converts audio data to {@link C#ENCODING_PCM_16BIT}. | ||
| */ | ||
| public FloatResamplingAudioProcessor() { | ||
| sampleRateHz = Format.NO_VALUE; | ||
| channelCount = Format.NO_VALUE; | ||
| sourceEncoding = C.ENCODING_INVALID; | ||
| buffer = EMPTY_BUFFER; | ||
| outputBuffer = EMPTY_BUFFER; | ||
| } | ||
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| @Override | ||
| public boolean configure(int sampleRateHz, int channelCount, @C.Encoding int encoding) | ||
| throws AudioProcessor.UnhandledFormatException { | ||
| if (encoding != C.ENCODING_PCM_24BIT && encoding != C.ENCODING_PCM_32BIT) { | ||
| throw new AudioProcessor.UnhandledFormatException(sampleRateHz, channelCount, encoding); | ||
| } | ||
| if (this.sampleRateHz == sampleRateHz && this.channelCount == channelCount | ||
| && this.sourceEncoding == encoding) { | ||
| return false; | ||
| } | ||
| this.sampleRateHz = sampleRateHz; | ||
| this.channelCount = channelCount; | ||
| this.sourceEncoding = encoding; | ||
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| return true; | ||
| } | ||
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| @Override | ||
| public boolean isActive() { | ||
| return sourceEncoding == C.ENCODING_PCM_24BIT || sourceEncoding == C.ENCODING_PCM_32BIT; | ||
| } | ||
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| @Override | ||
| public int getOutputChannelCount() { return channelCount; } | ||
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| @Override | ||
| public int getOutputEncoding() { return C.ENCODING_PCM_FLOAT; } | ||
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| @Override | ||
| public int getOutputSampleRateHz() { | ||
| return sampleRateHz; | ||
| } | ||
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| @Override | ||
| public void queueInput(ByteBuffer inputBuffer) { | ||
| int offset = inputBuffer.position(); | ||
| int limit = inputBuffer.limit(); | ||
| int size = limit - offset; | ||
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| int resampledSize; | ||
| switch (sourceEncoding) { | ||
| case C.ENCODING_PCM_24BIT: | ||
| resampledSize = (size / 3) * 4; | ||
| break; | ||
| case C.ENCODING_PCM_32BIT: | ||
| resampledSize = size; | ||
| break; | ||
| case C.ENCODING_PCM_8BIT: | ||
| case C.ENCODING_PCM_16BIT: | ||
| case C.ENCODING_PCM_FLOAT: | ||
| case C.ENCODING_INVALID: | ||
| case Format.NO_VALUE: | ||
| default: | ||
| // Never happens. | ||
| throw new IllegalStateException(); | ||
| } | ||
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| if (buffer.capacity() < resampledSize) { | ||
| buffer = ByteBuffer.allocateDirect(resampledSize).order(ByteOrder.nativeOrder()); | ||
| } else { | ||
| buffer.clear(); | ||
| } | ||
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| // Samples are little endian. | ||
| switch (sourceEncoding) { | ||
| case C.ENCODING_PCM_24BIT: | ||
| // 24->32 bit resampling. | ||
| for (int i = offset; i < limit; i += 3) { | ||
| int val = (inputBuffer.get(i) << 8) & 0x0000ff00 | (inputBuffer.get(i + 1) << 16) & 0x00ff0000 | | ||
| (inputBuffer.get(i + 2) << 24) & 0xff000000; | ||
| writePcm32bitFloat(val, buffer); | ||
| } | ||
| break; | ||
| case C.ENCODING_PCM_32BIT: | ||
| // 32->32 bit conversion. | ||
| for (int i = offset; i < limit; i += 4) { | ||
| int val = inputBuffer.get(i) & 0x000000ff | (inputBuffer.get(i) << 8) & 0x0000ff00 | | ||
| (inputBuffer.get(i + 1) << 16) & 0x00ff0000 | (inputBuffer.get(i + 2) << 24) & 0xff000000; | ||
| writePcm32bitFloat(val, buffer); | ||
| } | ||
| break; | ||
| case C.ENCODING_PCM_8BIT: | ||
| case C.ENCODING_PCM_16BIT: | ||
| case C.ENCODING_PCM_FLOAT: | ||
| case C.ENCODING_INVALID: | ||
| case Format.NO_VALUE: | ||
| default: | ||
| // Never happens. | ||
| throw new IllegalStateException(); | ||
| } | ||
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| inputBuffer.position(inputBuffer.limit()); | ||
| buffer.flip(); | ||
| outputBuffer = buffer; | ||
| } | ||
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| @Override | ||
| public void queueEndOfStream() { | ||
| inputEnded = true; | ||
| } | ||
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| @Override | ||
| public ByteBuffer getOutput() { | ||
| ByteBuffer outputBuffer = this.outputBuffer; | ||
| this.outputBuffer = EMPTY_BUFFER; | ||
| return outputBuffer; | ||
| } | ||
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| @SuppressWarnings("ReferenceEquality") | ||
| @Override | ||
| public boolean isEnded() { | ||
| return inputEnded && outputBuffer == EMPTY_BUFFER; | ||
| } | ||
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| @Override | ||
| public void flush() { | ||
| outputBuffer = EMPTY_BUFFER; | ||
| inputEnded = false; | ||
| } | ||
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| @Override | ||
| public void reset() { | ||
| flush(); | ||
| buffer = EMPTY_BUFFER; | ||
| sampleRateHz = Format.NO_VALUE; | ||
| channelCount = Format.NO_VALUE; | ||
| sourceEncoding = C.ENCODING_INVALID; | ||
| } | ||
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| /** | ||
| * Converts the provided value into 32-bit float PCM and writes to buffer. | ||
| * | ||
| * @param val 32-bit int value to convert to 32-bit float [-1.0, 1.0] | ||
| * @param buffer The output buffer. | ||
| */ | ||
| private static void writePcm32bitFloat(int val, ByteBuffer buffer) { | ||
| float convVal = (float) (PCM_INT32_FLOAT * val); | ||
| int bits = Float.floatToIntBits(convVal); | ||
| if (bits == 0x7fc00000) | ||
| bits = Float.floatToIntBits((float) 0.0); | ||
| buffer.putInt(bits); | ||
| } | ||
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| } | ||
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Please could you add an AOSP header? (Just copy from another file and replace the year with 2018.)
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Check