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/*
* Copyright (c) 2017, Xevo Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.smartdevicelink.encoder;
import android.annotation.TargetApi;
import android.media.MediaFormat;
import android.os.Build;
import com.smartdevicelink.util.DebugTool;
import java.nio.ByteBuffer;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public final class EncoderUtils {
private final static String TAG = "EncoderUtils";
/**
* Extracts codec-specific data from MediaFormat instance
*
* Currently, only AVC is supported.
*
* @param format MediaFormat instance retrieved from MediaCodec
* @return byte array containing codec-specific data, or null if an error occurred
*/
public static byte[] getCodecSpecificData(MediaFormat format) {
if (format == null) {
return null;
}
String name = format.getString(MediaFormat.KEY_MIME);
if (name == null) {
return null;
}
// same as MediaFormat.MIMETYPE_VIDEO_AVC but it requires API level 21
if (name.equals("video/avc")) {
return getAVCCodecSpecificData(format);
} else {
DebugTool.logWarning(TAG, "Retrieving codec-specific data for " + name + " is not supported");
return null;
}
}
/**
* Extracts H.264 codec-specific data (SPS and PPS) from MediaFormat instance
*
* The codec-specific data is in byte-stream format; 4-byte start codes (0x00 0x00 0x00 0x01)
* are added in front of SPS and PPS NAL units.
*
* @param format MediaFormat instance retrieved from MediaCodec
* @return byte array containing codec-specific data, or null if an error occurred
*/
private static byte[] getAVCCodecSpecificData(MediaFormat format) {
// For H.264, "csd-0" contains SPS and "csd-1" contains PPS. Refer to the documentation
// of MediaCodec.
if (!(format.containsKey("csd-0") && format.containsKey("csd-1"))) {
DebugTool.logWarning(TAG, "H264 codec specific data not found");
return null;
}
ByteBuffer sps = format.getByteBuffer("csd-0");
int spsLen = sps != null ? sps.remaining() : 0;
ByteBuffer pps = format.getByteBuffer("csd-1");
int ppsLen = pps != null ? pps.remaining() : 0;
byte[] output = new byte[spsLen + ppsLen];
try {
if (sps != null) {
sps.get(output, 0, spsLen);
}
if (pps != null) {
pps.get(output, spsLen, ppsLen);
}
} catch (Exception e) {
// should not happen
DebugTool.logWarning(TAG, "Error while copying H264 codec specific data: " + e);
return null;
}
return output;
}
private EncoderUtils() {}
}
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