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直播視訊網站源碼,多媒體圖檔壓縮工具類

直播視訊網站源碼,多媒體圖檔壓縮工具類相關的代碼

public class MediaUtils {

    private MediaUtils() {
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * @param bMute 值為true時為關閉背景音樂。
     */
    @TargetApi(Build.VERSION_CODES.FROYO) public static boolean muteAudioFocus(Context context,
        boolean bMute) {
        boolean bool = false;
        AudioManager am = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
        if (bMute) {
            int result =
                am.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
            bool = result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
        } else {
            int result = am.abandonAudioFocus(null);
            bool = result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED;
        }
        return bool;
    }

    /*
     * 3.品質壓縮
     * 設定bitmap options屬性,降低圖檔的品質,像素不會減少
     * 第一個參數為需要壓縮的bitmap圖檔對象,第二個參數為壓縮後圖檔儲存的位置
     * 設定options 屬性0-100,來實作壓縮
     *
     * @param bmp
     * @param file
     */
    public static void qualityCompress(String imgPath, String outImg) {
        File file = new File(outImg);
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(imgPath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        Bitmap bitmap = BitmapFactory.decodeStream(fis);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int options = 20;
        bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos);
        while (baos.toByteArray().length / 1024 > 190 && options > 5) { // 循環判斷如果壓縮後圖檔是否大于100kb,大于繼續壓縮

            baos.reset(); // 重置baos即清空baos
            bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos);// 這裡壓縮options%,把壓縮後的資料存放到baos中
            options -= 5;// 每次都減少5
        }
        try {
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(baos.toByteArray());
            fos.flush();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 品質壓縮方法
     */
    public static void compressImage(Bitmap image, String outImg) {
        File file = new File(outImg);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);// 品質壓縮方法,這裡100表示不壓縮,把壓縮後的資料存放到baos中
        /*int options = 90;

        while (baos.toByteArray().length / 1024 > 200 && options >= 10) { // 循環判斷如果壓縮後圖檔是否大于100kb,大于繼續壓縮
            baos.reset(); // 重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, options, baos);// 這裡壓縮options%,把壓縮後的資料存放到baos中
            options -= 10;// 每次都減少10
            LogUtil.e("圖檔壓縮中", "");
            LogUtil.e("options:", "" + options);
        }*/

        try {
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(baos.toByteArray());
            fos.flush();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Compress image by size, this will modify image width/height.
     * Used to get thumbnail
     *
     * @param pixelW target pixel of width
     * @param pixelH target pixel of height
     */
    public static void ratio(String imgPath, String outImg, float pixelW, float pixelH) {
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(imgPath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        Bitmap image = BitmapFactory.decodeStream(fis);
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, os);
        //判斷如果圖檔大于1M,進行壓縮避免在生成圖檔(BitmapFactory.decodeStream)時溢出
        if (os.toByteArray().length / 1024 > 180) {
            os.reset();//重置baos即清空baos
            image.compress(Bitmap.CompressFormat.JPEG, 90, os);//這裡壓縮50%,把壓縮後的資料存放到baos中
        }
        ByteArrayInputStream is = new ByteArrayInputStream(os.toByteArray());
        BitmapFactory.Options newOpts = new BitmapFactory.Options();
        //開始讀入圖檔,此時把options.inJustDecodeBounds 設回true了
        newOpts.inJustDecodeBounds = true;
        newOpts.inPreferredConfig = Bitmap.Config.RGB_565;
        Bitmap bitmap = BitmapFactory.decodeStream(is, null, newOpts);
        newOpts.inJustDecodeBounds = false;
        int w = newOpts.outWidth;
        int h = newOpts.outHeight;
        float hh = pixelH;// 設定高度為240f時,可以明顯看到圖檔縮小了
        float ww = pixelW;// 設定寬度為120f,可以明顯看到圖檔縮小了
        //縮放比。由于是固定比例縮放,隻用高或者寬其中一個資料進行計算即可
        int be = 1;//be=1表示不縮放
        if (w > h && w > ww) {//如果寬度大的話根據寬度固定大小縮放
            be = (int) (newOpts.outWidth / ww);
        } else if (w < h && h > hh) {//如果高度高的話根據寬度固定大小縮放
            be = (int) (newOpts.outHeight / hh);
        }
        if (be <= 0) be = 1;
        newOpts.inSampleSize = be;//設定縮放比例
        //重新讀入圖檔,注意此時已經把options.inJustDecodeBounds 設回false了
        is = new ByteArrayInputStream(os.toByteArray());
        bitmap = BitmapFactory.decodeStream(is, null, newOpts);
        //壓縮好比例大小後再進行品質壓縮
        compressImage(bitmap, outImg);
    }
}
           

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