Android MediaCodec 使用例子

来源：互联网发布：ifunbox for mac 编辑：程序博客网时间：2024/05/05 13:25

public class AvcEncoder {

private MediaCodec mediaCodec;
private BufferedOutputStream outputStream;

public AvcEncoder() {
File f = new File(Environment.getExternalStorageDirectory(), “Download/video_encoded.264”);
touch (f);
try {
outputStream = new BufferedOutputStream(new FileOutputStream(f));
Log.i(“AvcEncoder”, “outputStream initialized”);
} catch (Exception e){
e.printStackTrace();
}

mediaCodec = MediaCodec.createEncoderByType("video/avc");MediaFormat mediaFormat = MediaFormat.createVideoFormat("video/avc", 320, 240);mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, 125000);mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 15);mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar);mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 5);mediaCodec.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);mediaCodec.start();

}

public void close() {
try {
mediaCodec.stop();
mediaCodec.release();
outputStream.flush();
outputStream.close();
} catch (Exception e){
e.printStackTrace();
}
}

// called from Camera.setPreviewCallbackWithBuffer(…) in other class
public void offerEncoder(byte[] input) {
try {
ByteBuffer[] inputBuffers = mediaCodec.getInputBuffers();
ByteBuffer[] outputBuffers = mediaCodec.getOutputBuffers();
int inputBufferIndex = mediaCodec.dequeueInputBuffer(-1);
if (inputBufferIndex >= 0) {
ByteBuffer inputBuffer = inputBuffers[inputBufferIndex];
inputBuffer.clear();
inputBuffer.put(input);
mediaCodec.queueInputBuffer(inputBufferIndex, 0, input.length, 0, 0);
}

    MediaCodec.BufferInfo bufferInfo = new MediaCodec.BufferInfo();    int outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo,0);    while (outputBufferIndex >= 0) {        ByteBuffer outputBuffer = outputBuffers[outputBufferIndex];        byte[] outData = new byte[bufferInfo.size];        outputBuffer.get(outData);        outputStream.write(outData, 0, outData.length);        Log.i("AvcEncoder", outData.length + " bytes written");        mediaCodec.releaseOutputBuffer(outputBufferIndex, false);        outputBufferIndex = mediaCodec.dequeueOutputBuffer(bufferInfo, 0);    }} catch (Throwable t) {    t.printStackTrace();}

}

0 0