Java Sound : audio inputstream from pcm amplitude array

转载自：http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/java-sound-making-audio-input-stream.html

In this post, i am going to show the code for creating the AudioInputStream from an PCM - amplitude array.

It basically converts the int [] array to byte array according to AudioFormat.

The code for the reverse operation (extract amplitude array from recorded wave file or AudioStream )is in my

earlier post : http://ganeshtiwaridotcomdotnp.blogspot.com/2011/12/java-extract-amplitude-array-from.html

The code for converting PCM amplitude array to AudioStream is follows :

public static AudioInputStream getAudioStreamFromPCMArray(int[] audioDataIntArr, AudioFormat format) {

        byte[] data = null;

        int nlengthInSamples = audioDataIntArr.length * 2;

        if (format.getSampleSizeInBits() == 16) {

            // FIXME: debug at full length, signed/unsigned problem

            data = new byte[nlengthInSamples];

            if (format.isBigEndian()) {

                for (int i = 0; i < audioDataIntArr.length; i++) {

                    int temp = Math.abs((short) (audioDataIntArr[i] * 255));

                    data[2 * i + 1] = (byte) temp;

                    data[2 * i + 0] = (byte) (temp >> 8);

                }

            } else {

                for (int i = 0; i < audioDataIntArr.length; i++) {

                    int temp = Math.abs((short) (audioDataIntArr[i] * 255));

                    data[2 * i + 0] = (byte) temp;

                    data[2 * i + 1] = (byte) (temp >> 8);

                }

            }

        } else if (format.getSampleSizeInBits() == 8) {

            nlengthInSamples = audioDataIntArr.length;

            data = new byte[nlengthInSamples];

            if (format.getEncoding().toString().startsWith("PCM_SIGN")) {

                // PCM_SIGNED

                for (int i = 0; i < nlengthInSamples; i++) {

                    data[i] = (byte) audioDataIntArr[i];

                }

            } else {

                // PCM_UNSIGNED

                for (int i = 0; i < nlengthInSamples; i++) {

                    data[i] = (byte) (audioDataIntArr[i] + 128);

                }

            }

        }// end of if..else

        try {

            ByteArrayInputStream bais = new ByteArrayInputStream(data);

            AudioInputStream ais = new AudioInputStream(bais, format, audioDataIntArr.length);

            return ais;

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }

//## Required Testing -- Comments are much welcomed ...... Thanks

巴特西

Java Sound : audio inputstream from pcm amplitude array

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