Android Open Source - android-transcoder Android16 By9 Format Strategy

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2014 Yuya Tanaka//from w  w  w . ja v  a2  s. co  m
 *
 * 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 net.ypresto.androidtranscoder.format;

import android.media.MediaCodecInfo;
import android.media.MediaFormat;
import android.util.Log;

class Android16By9FormatStrategy implements MediaFormatStrategy {
    public static final int SCALE_720P = 5;
    private static final String TAG = "Android16By9FormatStrategy";
    private final int mScale;
    private final int mBitrate;

    public Android16By9FormatStrategy(int scale, int bitrate) {
        mScale = scale;
        mBitrate = bitrate;
    }

    @Override
    public MediaFormat createVideoOutputFormat(MediaFormat inputFormat) {
        int width = inputFormat.getInteger(MediaFormat.KEY_WIDTH);
        int height = inputFormat.getInteger(MediaFormat.KEY_HEIGHT);
        int targetLonger = mScale * 16 * 16;
        int targetShorter = mScale * 16 * 9;
        int longer, shorter, outWidth, outHeight;
        if (width >= height) {
            longer = width;
            shorter = height;
            outWidth = targetLonger;
            outHeight = targetShorter;
        } else {
            shorter = width;
            longer = height;
            outWidth = targetShorter;
            outHeight = targetLonger;
        }
        if (longer * 9 != shorter * 16) {
            throw new OutputFormatUnavailableException("This video is not 16:9, and is not able to transcode. (" + width + "x" + height + ")");
        }
        if (shorter <= targetShorter) {
            Log.d(TAG, "This video's height is less or equal to " + targetShorter + ", pass-through. (" + width + "x" + height + ")");
            return null;
        }
        MediaFormat format = MediaFormat.createVideoFormat("video/avc", outWidth, outHeight);
        // From Nexus 4 Camera in 720p
        format.setInteger(MediaFormat.KEY_BIT_RATE, mBitrate);
        format.setInteger(MediaFormat.KEY_FRAME_RATE, 30);
        format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 3);
        format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
        return format;
    }

    @Override
    public MediaFormat createAudioOutputFormat(MediaFormat inputFormat) {
        return null;
    }
}

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