Android Open Source - android-transcoder Media Format Presets

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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 .j  a va 2 s  .  c o 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;

// Refer for example: https://gist.github.com/wobbals/3990442
// Refer for preferred parameters: https://developer.apple.com/library/ios/documentation/networkinginternet/conceptual/streamingmediaguide/UsingHTTPLiveStreaming/UsingHTTPLiveStreaming.html#//apple_ref/doc/uid/TP40008332-CH102-SW8
// Refer for available keys: (ANDROID ROOT)/media/libstagefright/ACodec.cpp
public class MediaFormatPresets {
    private static final int LONGER_LENGTH_960x540 = 960;

    private MediaFormatPresets() {
    }

    // preset similar to iOS SDK's AVAssetExportPreset960x540
    @Deprecated
    public static MediaFormat getExportPreset960x540() {
        MediaFormat format = MediaFormat.createVideoFormat("video/avc", 960, 540);
        format.setInteger(MediaFormat.KEY_BIT_RATE, 5500 * 1000);
        format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
        format.setInteger(MediaFormat.KEY_FRAME_RATE, 30);
        format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
        return format;
    }

    /**
     * Preset similar to iOS SDK's AVAssetExportPreset960x540.
     * Note that encoding resolutions of this preset are not supported in all devices e.g. Nexus 4.
     * On unsupported device encoded video stream will be broken without any exception.
     * @param originalWidth Input video width.
     * @param originalHeight Input video height.
     * @return MediaFormat instance, or null if pass through.
     */
    public static MediaFormat getExportPreset960x540(int originalWidth, int originalHeight) {
        int longerLength = Math.max(originalWidth, originalHeight);
        int shorterLength = Math.min(originalWidth, originalHeight);

        if (longerLength <= LONGER_LENGTH_960x540) return null; // don't upscale

        int residue = LONGER_LENGTH_960x540 * shorterLength % longerLength;
        if (residue != 0) {
            double ambiguousShorter = (double) LONGER_LENGTH_960x540 * shorterLength / longerLength;
            throw new OutputFormatUnavailableException(String.format(
                    "Could not fit to integer, original: (%d, %d), scaled: (%d, %f)",
                    longerLength, shorterLength, LONGER_LENGTH_960x540, ambiguousShorter));
        }

        int scaledShorter = LONGER_LENGTH_960x540 * shorterLength / longerLength;
        int width, height;
        if (originalWidth >= originalHeight) {
            width = LONGER_LENGTH_960x540;
            height = scaledShorter;
        } else {
            width = scaledShorter;
            height = LONGER_LENGTH_960x540;
        }

        MediaFormat format = MediaFormat.createVideoFormat("video/avc", width, height);
        format.setInteger(MediaFormat.KEY_BIT_RATE, 5500 * 1000);
        format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
        format.setInteger(MediaFormat.KEY_FRAME_RATE, 30);
        format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
        return format;
    }
}
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