/**
* Edits a video file, saving the contents to a new file. This involves decoding and re-encoding,
* not to mention conversions between YUV and RGB, and so may be lossy.
*
* <p>If we recognize the decoded format we can do this in Java code using the ByteBuffer[]
* output, but it's not practical to support all OEM formats. By using a SurfaceTexture for output
* and a Surface for input, we can avoid issues with obscure formats and can use a fragment shader
* to do transformations.
*/
private VideoChunks editVideoFile(VideoChunks inputData) {
if (VERBOSE) Log.d(TAG, "editVideoFile " + mWidth + "x" + mHeight);
VideoChunks outputData = new VideoChunks();
MediaCodec decoder = null;
MediaCodec encoder = null;
InputSurface inputSurface = null;
OutputSurface outputSurface = null;
try {
MediaFormat inputFormat = inputData.getMediaFormat();
// Create an encoder format that matches the input format. (Might be able to just
// re-use the format used to generate the video, since we want it to be the same.)
MediaFormat outputFormat = MediaFormat.createVideoFormat(MIME_TYPE, mWidth, mHeight);
outputFormat.setInteger(
MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
outputFormat.setInteger(
MediaFormat.KEY_BIT_RATE, inputFormat.getInteger(MediaFormat.KEY_BIT_RATE));
outputFormat.setInteger(
MediaFormat.KEY_FRAME_RATE, inputFormat.getInteger(MediaFormat.KEY_FRAME_RATE));
outputFormat.setInteger(
MediaFormat.KEY_I_FRAME_INTERVAL,
inputFormat.getInteger(MediaFormat.KEY_I_FRAME_INTERVAL));
outputData.setMediaFormat(outputFormat);
encoder = MediaCodec.createEncoderByType(MIME_TYPE);
encoder.configure(outputFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
inputSurface = new InputSurface(encoder.createInputSurface());
inputSurface.makeCurrent();
encoder.start();
// OutputSurface uses the EGL context created by InputSurface.
decoder = MediaCodec.createDecoderByType(MIME_TYPE);
outputSurface = new OutputSurface();
outputSurface.changeFragmentShader(FRAGMENT_SHADER);
decoder.configure(inputFormat, outputSurface.getSurface(), null, 0);
decoder.start();
editVideoData(inputData, decoder, outputSurface, inputSurface, encoder, outputData);
} finally {
if (VERBOSE) Log.d(TAG, "shutting down encoder, decoder");
if (outputSurface != null) {
outputSurface.release();
}
if (inputSurface != null) {
inputSurface.release();
}
if (encoder != null) {
encoder.stop();
encoder.release();
}
if (decoder != null) {
decoder.stop();
decoder.release();
}
}
return outputData;
}
@Override
protected void prepare() throws IOException {
if (DEBUG) Log.v(TAG, "prepare:");
mTrackIndex = -1;
mMuxerStarted = mIsEOS = false;
// prepare MediaCodec for AAC encoding of audio data from inernal mic.
final MediaCodecInfo audioCodecInfo = selectAudioCodec(MIME_TYPE);
if (audioCodecInfo == null) {
Log.e(TAG, "Unable to find an appropriate codec for " + MIME_TYPE);
return;
}
if (DEBUG) Log.i(TAG, "selected codec: " + audioCodecInfo.getName());
final MediaFormat audioFormat = MediaFormat.createAudioFormat(MIME_TYPE, SAMPLE_RATE, 1);
audioFormat.setInteger(
MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC);
audioFormat.setInteger(MediaFormat.KEY_CHANNEL_MASK, AudioFormat.CHANNEL_IN_MONO);
audioFormat.setInteger(MediaFormat.KEY_BIT_RATE, BIT_RATE);
audioFormat.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1);
// audioFormat.setLong(MediaFormat.KEY_MAX_INPUT_SIZE, inputFile.length());
// audioFormat.setLong(MediaFormat.KEY_DURATION, (long)durationInMs );
if (DEBUG) Log.i(TAG, "format: " + audioFormat);
mMediaCodec = MediaCodec.createEncoderByType(MIME_TYPE);
mMediaCodec.configure(audioFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mMediaCodec.start();
if (DEBUG) Log.i(TAG, "prepare finishing");
if (mListener != null) {
try {
mListener.onPrepared(this);
} catch (final Exception e) {
Log.e(TAG, "prepare:", e);
}
}
}
/**
* Create the display surface out of the encoder. The data to encoder will be fed from this
* Surface itself.
*
* @return
* @throws IOException
*/
@TargetApi(19)
private Surface createDisplaySurface() throws IOException {
MediaFormat mMediaFormat =
MediaFormat.createVideoFormat(CodecUtils.MIME_TYPE, CodecUtils.WIDTH, CodecUtils.HEIGHT);
mMediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, (int) (1024 * 1024 * 0.5));
mMediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, 30);
mMediaFormat.setInteger(
MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
mMediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, 1);
Log.i(TAG, "Starting encoder");
encoder = MediaCodec.createEncoderByType(CodecUtils.MIME_TYPE);
encoder.configure(mMediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
Surface surface = encoder.createInputSurface();
return surface;
}
public void prepareEncode() {
MediaFormat mediaFormat = MediaFormat.createVideoFormat(MIME_TYPE, mWidth, mHeight);
// 描述视频格式的信息
mediaFormat.setInteger(
MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, BITRATE); // 比特率
mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE); // 帧数
mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, IFRAME_INTERVAL); // 关键帧间隔时间
try {
mEncoder = MediaCodec.createEncoderByType(MIME_TYPE);
mEncoder.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mSurface = mEncoder.createInputSurface();
mEncoder.start();
mediaMuxer = new MediaMuxer(filePath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 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;
}
/** Configures encoder and muxer state, and prepares the input Surface. */
public VideoEncoderCore(int width, int height, int bitRate, Muxer muxer) throws IOException {
mMuxer = muxer;
mBufferInfo = new MediaCodec.BufferInfo();
MediaFormat format = MediaFormat.createVideoFormat(MIME_TYPE, width, height);
// Set some properties. Failing to specify some of these can cause the MediaCodec
// configure() call to throw an unhelpful exception.
format.setInteger(
MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
format.setInteger(MediaFormat.KEY_BIT_RATE, bitRate);
format.setInteger(MediaFormat.KEY_FRAME_RATE, FRAME_RATE);
format.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, IFRAME_INTERVAL);
if (VERBOSE) Log.d(TAG, "format: " + format);
// Create a MediaCodec encoder, and configure it with our format. Get a Surface
// we can use for input and wrap it with a class that handles the EGL work.
mEncoder = MediaCodec.createEncoderByType(MIME_TYPE);
mEncoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mInputSurface = mEncoder.createInputSurface();
mEncoder.start();
mTrackIndex = -1;
}
@Override
public MediaCodec getAudioEncoder() {
return MediaCodec.createEncoderByType("audio/mp4a-latm");
}
@Override
public MediaCodec getVideoEncoder() {
return MediaCodec.createEncoderByType("video/avc");
}
@Override
@SuppressLint({"InlinedApi", "NewApi"})
protected void encodeWithFFmpeg() throws IOException {
final int bufferSize =
AudioRecord.getMinBufferSize(
mQuality.samplingRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT)
* 2;
((AACLATMPacketizer) mPacketizer).setSamplingRate(mQuality.samplingRate);
mAudioRecord =
new AudioRecord(
MediaRecorder.AudioSource.MIC,
mQuality.samplingRate,
AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT,
bufferSize);
mMediaCodec = MediaCodec.createEncoderByType("audio/mp4a-latm");
MediaFormat format = new MediaFormat();
format.setString(MediaFormat.KEY_MIME, "audio/mp4a-latm");
format.setInteger(MediaFormat.KEY_BIT_RATE, mQuality.bitRate);
format.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1);
format.setInteger(MediaFormat.KEY_SAMPLE_RATE, mQuality.samplingRate);
format.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC);
format.setInteger(MediaFormat.KEY_MAX_INPUT_SIZE, bufferSize);
mMediaCodec.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
mAudioRecord.startRecording();
mMediaCodec.start();
final MediaCodecInputStream inputStream = new MediaCodecInputStream(mMediaCodec);
final ByteBuffer[] inputBuffers = mMediaCodec.getInputBuffers();
mThread =
new Thread(
new Runnable() {
@Override
public void run() {
int len = 0, bufferIndex = 0;
try {
while (!Thread.interrupted()) {
bufferIndex = mMediaCodec.dequeueInputBuffer(10000);
if (bufferIndex >= 0) {
inputBuffers[bufferIndex].clear();
len = mAudioRecord.read(inputBuffers[bufferIndex], bufferSize);
if (len == AudioRecord.ERROR_INVALID_OPERATION
|| len == AudioRecord.ERROR_BAD_VALUE) {
Log.e(TAG, "An error occured with the AudioRecord API !");
} else {
// Log.v(TAG,"Pushing raw audio to the decoder: len="+len+" bs:
// "+inputBuffers[bufferIndex].capacity());
mMediaCodec.queueInputBuffer(
bufferIndex, 0, len, System.nanoTime() / 1000, 0);
}
}
}
} catch (RuntimeException e) {
e.printStackTrace();
}
}
});
mThread.start();
// The packetizer encapsulates this stream in an RTP stream and send it
// over the network
mPacketizer.setInputStream(inputStream);
mPacketizer.start();
mStreaming = true;
}