/*
 *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

package org.webrtc;

import android.media.MediaCodecInfo;
import android.media.MediaCodecInfo.CodecCapabilities;
import android.os.Build;

import java.util.HashMap;
import java.util.Map;

/**
 * Container class for static constants and helpers used with MediaCodec.
 */
// We are forced to use the old API because we want to support API level < 21.
@SuppressWarnings("deprecation")
class MediaCodecUtils {
    private static final String TAG = "MediaCodecUtils";

    // Prefixes for supported hardware encoder/decoder component names.
    static final String EXYNOS_PREFIX = "OMX.Exynos.";
    static final String INTEL_PREFIX = "OMX.Intel.";
    static final String NVIDIA_PREFIX = "OMX.Nvidia.";
    static final String QCOM_PREFIX = "OMX.qcom.";

    static final String[] SOFTWARE_IMPLEMENTATION_PREFIXES = {"OMX.google.", "OMX.SEC."};

    // NV12 color format supported by QCOM codec, but not declared in MediaCodec -
    // see /hardware/qcom/media/mm-core/inc/OMX_QCOMExtns.h
    static final int COLOR_QCOM_FORMATYVU420PackedSemiPlanar32m4ka = 0x7FA30C01;
    static final int COLOR_QCOM_FORMATYVU420PackedSemiPlanar16m4ka = 0x7FA30C02;
    static final int COLOR_QCOM_FORMATYVU420PackedSemiPlanar64x32Tile2m8ka = 0x7FA30C03;
    static final int COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m = 0x7FA30C04;

    // Color formats supported by hardware decoder - in order of preference.
    static final int[] DECODER_COLOR_FORMATS = new int[]{CodecCapabilities.COLOR_FormatYUV420Planar,
            CodecCapabilities.COLOR_FormatYUV420SemiPlanar,
            CodecCapabilities.COLOR_QCOM_FormatYUV420SemiPlanar,
            MediaCodecUtils.COLOR_QCOM_FORMATYVU420PackedSemiPlanar32m4ka,
            MediaCodecUtils.COLOR_QCOM_FORMATYVU420PackedSemiPlanar16m4ka,
            MediaCodecUtils.COLOR_QCOM_FORMATYVU420PackedSemiPlanar64x32Tile2m8ka,
            MediaCodecUtils.COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m};

    // Color formats supported by hardware encoder - in order of preference.
    static final int[] ENCODER_COLOR_FORMATS = {
            MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar,
            MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420SemiPlanar,
            MediaCodecInfo.CodecCapabilities.COLOR_QCOM_FormatYUV420SemiPlanar,
            MediaCodecUtils.COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m};

    // Color formats supported by texture mode encoding - in order of preference.
    static final int[] TEXTURE_COLOR_FORMATS = getTextureColorFormats();

    private static int[] getTextureColorFormats() {
        if (Build.VERSION.SDK_INT >= 18) {
            return new int[]{MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface};
        } else {
            return new int[]{};
        }
    }

    static Integer selectColorFormat(
            int[] supportedColorFormats, CodecCapabilities capabilities) {
        for (int supportedColorFormat : supportedColorFormats) {
            for (int codecColorFormat : capabilities.colorFormats) {
                if (codecColorFormat == supportedColorFormat) {
                    return codecColorFormat;
                }
            }
        }
        return null;
    }

    static boolean codecSupportsType(MediaCodecInfo info, VideoCodecType type) {
        for (String mimeType : info.getSupportedTypes()) {
            if (type.mimeType().equals(mimeType)) {
                return true;
            }
        }
        return false;
    }

    static Map<String, String> getCodecProperties(VideoCodecType type, boolean highProfile) {
        switch (type) {
            case VP8:
            case VP9:
                return new HashMap<>();
            case H264:
                return H264Utils.getDefaultH264Params(highProfile);
            default:
                throw new IllegalArgumentException("Unsupported codec: " + type);
        }
    }

    private MediaCodecUtils() {
        // This class should not be instantiated.
    }
}
