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Issue: androidx/media#725 Ideally the test to transmux a `ts` file (having 3 bytes NAL start code) should go into `Mp4MuxerEndToEndTest`but `Mp4MuxerEndToEndTest` uses `MediaExtractor` and `MediaExtractor` is returning samples with `4 byte NAL start code` which will not exercise the newly added code path. Hence the test is added in `TransformerWithInAppMuxerEndToEndTest` which internally uses `media3 extractor` and feeds samples with `3 bytes NAL start code` only. PiperOrigin-RevId: 617985866
72 lines
2.4 KiB
Java
72 lines
2.4 KiB
Java
/*
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* Copyright 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package androidx.media3.muxer;
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import static androidx.media3.common.util.Assertions.checkArgument;
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import androidx.media3.common.util.UnstableApi;
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import com.google.common.collect.ImmutableList;
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import java.nio.ByteBuffer;
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/**
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* Converts a buffer containing H.264/H.265 NAL units from the Annex-B format (ISO/IEC 14496-14
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* Annex B, which uses start codes to delineate NAL units) to the avcC format (ISO/IEC 14496-15,
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* which uses length prefixes).
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*/
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@UnstableApi
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public interface AnnexBToAvccConverter {
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/** Default implementation for {@link AnnexBToAvccConverter}. */
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AnnexBToAvccConverter DEFAULT =
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(ByteBuffer inputBuffer) -> {
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if (!inputBuffer.hasRemaining()) {
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return inputBuffer;
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}
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checkArgument(
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inputBuffer.position() == 0, "The input buffer should have position set to 0.");
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ImmutableList<ByteBuffer> nalUnitList = AnnexBUtils.findNalUnits(inputBuffer);
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int totalBytesNeeded = 0;
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for (int i = 0; i < nalUnitList.size(); i++) {
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// 4 bytes to store NAL unit length.
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totalBytesNeeded += 4 + nalUnitList.get(i).remaining();
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}
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ByteBuffer outputBuffer = ByteBuffer.allocate(totalBytesNeeded);
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for (int i = 0; i < nalUnitList.size(); i++) {
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ByteBuffer currentNalUnit = nalUnitList.get(i);
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int currentNalUnitLength = currentNalUnit.remaining();
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// Rewrite NAL units with NAL unit length in place of start code.
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outputBuffer.putInt(currentNalUnitLength);
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outputBuffer.put(currentNalUnit);
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}
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outputBuffer.rewind();
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return outputBuffer;
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};
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/**
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* Returns the processed {@link ByteBuffer}.
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*
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* <p>Expects a {@link ByteBuffer} input with a zero offset.
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*
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* @param inputBuffer The buffer to be converted.
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*/
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ByteBuffer process(ByteBuffer inputBuffer);
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}
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