/**
* Configures encoder and muxer state, and prepares the input Surface. Initializes mEncoder,
* mMuxer, mRecordingSurface, mBufferInfo, mTrackIndex, and mMuxerStarted.
*/
private void configureMediaCodecEncoder() {
mBufferInfo = new MediaCodec.BufferInfo();
MediaFormat format =
MediaFormat.createVideoFormat(MIME_TYPE, mStreamSize.getWidth(), mStreamSize.getHeight());
/**
* Set encoding properties. Failing to specify some of these can cause the MediaCodec
* configure() call to throw an exception.
*/
format.setInteger(
MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
format.setInteger(MediaFormat.KEY_BIT_RATE, mEncBitRate);
format.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE);
format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, IFRAME_INTERVAL);
Log.i(TAG, "configure video encoding format: " + format);
// Create/configure a MediaCodec encoder.
mEncoder = MediaCodec.createEncoderByType(MIME_TYPE);
mEncoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mRecordingSurface = mEncoder.createInputSurface();
mEncoder.start();
String outputFileName = getOutputMediaFileName();
if (outputFileName == null) {
throw new IllegalStateException("Failed to get video output file");
}
/**
* Create a MediaMuxer. We can't add the video track and start() the muxer until the encoder
* starts and notifies the new media format.
*/
try {
mMuxer = new MediaMuxer(outputFileName, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
} catch (IOException ioe) {
throw new IllegalStateException("MediaMuxer creation failed", ioe);
}
mMuxerStarted = false;
}
/**
* Configure stream with a size and encoder mode.
*
* @param size Size of recording stream.
* @param useMediaCodec The encoder for this stream to use, either MediaCodec or MediaRecorder.
* @param bitRate Bit rate the encoder takes.
*/
public synchronized void configure(Size size, boolean useMediaCodec, int bitRate) {
if (getStreamState() == STREAM_STATE_RECORDING) {
throw new IllegalStateException("Stream can only be configured when stream is in IDLE state");
}
boolean isConfigChanged =
(!mStreamSize.equals(size))
|| (mUseMediaCodec != useMediaCodec)
|| (mEncBitRate != bitRate);
mStreamSize = size;
mUseMediaCodec = useMediaCodec;
mEncBitRate = bitRate;
if (mUseMediaCodec) {
if (getStreamState() == STREAM_STATE_CONFIGURED) {
/**
* Stream is already configured, need release encoder and muxer first, then reconfigure only
* if configuration is changed.
*/
if (!isConfigChanged) {
/**
* TODO: this is only the skeleton, it is tricky to implement because muxer need
* reconfigure always. But muxer is closely coupled with MediaCodec for now because muxer
* can only be started once format change callback is sent from mediacodec. We need
* decouple MediaCodec and Muxer for future.
*/
}
releaseEncoder();
releaseMuxer();
configureMediaCodecEncoder();
} else {
configureMediaCodecEncoder();
}
} else {
// TODO: implement MediaRecoder mode.
Log.w(TAG, "MediaRecorder configure is not implemented yet");
}
setStreamState(STREAM_STATE_CONFIGURED);
}