/**
* 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 (AppSettings.Logging.SendToConsole)
{
Log.Debug(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.KeyColorFormat, (int)MediaCodecInfo.CodecCapabilities.COLORFormatSurface);
outputFormat.SetInteger(MediaFormat.KeyBitRate, inputFormat.GetInteger(MediaFormat.KeyBitRate));
outputFormat.SetInteger(MediaFormat.KeyFrameRate, inputFormat.GetInteger(MediaFormat.KeyFrameRate));
outputFormat.SetInteger(MediaFormat.KeyIFrameInterval, inputFormat.GetInteger(MediaFormat.KeyIFrameInterval));
outputData.setMediaFormat(outputFormat);
encoder = MediaCodec.CreateEncoderByType(MIME_TYPE);
encoder.Configure(outputFormat, null, null, MediaCodecConfigFlags.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.Surface, null, 0);
decoder.Start();
editVideoData(inputData, decoder, outputSurface, inputSurface, encoder, outputData);
} finally {
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(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);
}
/**
* Generates a test video file, saving it as VideoChunks. We generate frames with GL to
* avoid having to deal with multiple YUV formats.
*
* @return true on success, false on "soft" failure
*/
private bool generateVideoFile(VideoChunks output)
{
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "generateVideoFile " + mWidth + "x" + mHeight);
}
MediaCodec encoder = null;
InputSurface inputSurface = null;
try {
MediaCodecInfo codecInfo = selectCodec(MIME_TYPE);
if (codecInfo == null)
{
// Don't fail CTS if they don't have an AVC codec (not here, anyway).
Log.Error(TAG, "Unable to find an appropriate codec for " + MIME_TYPE);
return(false);
}
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "found codec: " + codecInfo.Name);
}
// We avoid the device-specific limitations on width and height by using values that
// are multiples of 16, which all tested devices seem to be able to handle.
MediaFormat format = MediaFormat.CreateVideoFormat(MIME_TYPE, mWidth, mHeight);
// Set some properties. Failing to specify some of these can cause the MediaCodec
// configure() call to throw an unhelpful exception.
format.SetInteger(MediaFormat.KeyColorFormat,
(int)MediaCodecCapabilities.Formatsurface);
format.SetInteger(MediaFormat.KeyBitRate, mBitRate);
format.SetInteger(MediaFormat.KeyFrameRate, FRAME_RATE);
format.SetInteger(MediaFormat.KeyIFrameInterval, IFRAME_INTERVAL);
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "format: " + format);
}
output.setMediaFormat(format);
// Create a MediaCodec for the desired codec, then configure it as an encoder with
// our desired properties.
encoder = MediaCodec.CreateByCodecName(codecInfo.Name);
encoder.Configure(format, null, null, MediaCodecConfigFlags.Encode);
inputSurface = new InputSurface(encoder.CreateInputSurface());
inputSurface.MakeCurrent();
encoder.Start();
generateVideoData(encoder, inputSurface, output);
} finally {
if (encoder != null)
{
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "releasing encoder");
}
encoder.Stop();
encoder.Release();
if (AppSettings.Logging.SendToConsole)
{
Log.Debug(TAG, "released encoder");
}
}
if (inputSurface != null)
{
inputSurface.Release();
}
}
return(true);
}