利用媒体codeC PCM到AAC转换 [英] PCM to AAC conversion using mediacodec
本文介绍了利用媒体codeC PCM到AAC转换的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用的Android（果冻豆）媒体codeC等级，符合EN code PCM格式为AAC。该文件是EN codeD，但没有音乐播放器能够播放该文件。我无法在网络上找到任何工作code或适当的文件。
这是我的code：
公共无效doConvert（）
{
新的AsyncTask＆LT;虚空，虚空，虚空＆GT;（）
{
@覆盖
保护无效doInBackground（空... PARAMS）
{
尝试
{
INT codecCount =媒体codecList.get codecCount（）;
的for（int i = 0; I＆LT; codecCount;我++）
{
媒体codecInfo信息=媒体codecList.get codecInfoAt（我）;
。Logger.getLogger（MainActivity.class.getSimpleName（））日志（Level.INFO，info.getName（））;
对于（字符串类型：info.getSupportedTypes（））
{
Logger.getLogger（MainActivity.class.getSimpleName（））日志（Level.INFO，类型）。
}
}
inputfile文件=新的文件（Environment.getExternalStorageDirectory（）getAbsolutePath（）+/下载/ Ghajini27_Mono_8Khz.wav。）;
// inputfile文件=新的文件（sampleFD.get）;
Log.e（文件，将String.valueOf（inputFile.length（）））;
的FileInputStream FIS =新的FileInputStream（INPUTFILE）;
fis.skip（44）; //删除WAV头
文件OUTPUTFILE =新的文件（Environment.getExternalStorageDirectory（）getAbsolutePath（）+/下载/ out.m4a。）;
如果（outputFile.exists（））outputFile.delete（）;
FileOutputStream中FOS =新的FileOutputStream（OUTPUTFILE）;
//的BufferedOutputStream BOS =新的BufferedOutputStream（新的FileOutputStream（OUTPUTFILE））;
媒体codeC codeC =媒体codec.createEn coderByType（音频/ MP4A-LATM）;
MediaFormat OUTPUTFORMAT = MediaFormat.createAudioFormat（音频/ MP4A-LATM，22050，1）;
outputFormat.setInteger（MediaFormat.KEY_AAC_PROFILE，媒体codecInfo codecProfileLevel.AACObjectLC。）;
// outputFormat.setInteger（MediaFormat.KEY_CHANNEL_MASK，AudioFormat.CHANNEL_CONFIGURATION_MONO）;
outputFormat.setInteger（MediaFormat.KEY_BIT_RATE，22050）;
outputFormat.setInteger（MediaFormat.KEY_CHANNEL_COUNT，1）;
//outputFormat.setLong(MediaFormat.KEY_MAX_INPUT_SIZE，inputFile.length（））;
双durationInMs =（inputFile.length（）/ 16000）* 1000;
Log.e（持续时间，将String.valueOf（（长）durationInMs））;
outputFormat.setLong（MediaFormat.KEY_DURATION，（长）durationInMs）;
codec.configure（OUTPUTFORMAT，NULL，NULL，媒体codec.CONFIGURE_FLAG_EN code）;
codec.start（）;
ByteBuffer的[] inputBuffers = codec.getInputBuffers（）;
ByteBuffer的[] OUTPUTBUFFER = codec.getOutputBuffers（）;
布尔hasMoreData = TRUE;
媒体codec.BufferInfo outBuffInfo =新BufferInfo（）;
字节readBuffer [] =新的字节[48000]
字节writeBuffer [] =新的字节[48000]
做
{
INT nextBuffer = codec.dequeueInputBuffer（5000）;
Log.e（NextBuffer，nextInputBuffer =+ nextBuffer）;
如果（nextBuffer＆GT; = 0）
{
ByteBuffer的INBUF = inputBuffers [nextBuffer]
inBuf.clear（）;
INT读取动作= fis.read（readBuffer，0，inBuf.capacity（））;
Log.e（读取动作，读=+读取动作）;
如果（读取动作＆其中; inBuf.capacity（））
{
hasMoreData = FALSE;
}
inBuf.put（readBuffer，0，读取动作）;
codec.queueInputBuffer（nextBuffer，0，读取动作，0，0 hasMoreData：媒体codec.BUFFER_FLAG_END_OF_STREAM）;
}
INT outputBufferIndex = codec.dequeueOutputBuffer（outBuffInfo，3000）;
/ * logger.log（Level.INFOnextOutputBuffer =+ outputBufferIndex）;
logger.log（Level.INFO，outBuffInfo偏移=+ outBuffInfo.offset）;
logger.log（Level.INFO，outBuffInfo大小=+ outBuffInfo.size）;
logger.log（Level.INFO，outBuffInfo标志=+ outBuffInfo.flags）; * /
//而（outputBufferIndex＆GT; -1）
// {
OUTPUTBUFFER [outputBufferIndex] .position（outBuffInfo.offset）;
OUTPUTBUFFER [outputBufferIndex]获得（writeBuffer，0，outBuffInfo.size）;
fos.write（writeBuffer，0，outBuffInfo.size）;
// logger.log（Level.INFO，写作=+ outBuffInfo.size +字节）;
OUTPUTBUFFER [outputBufferIndex] .clear（）;
codec.releaseOutputBuffer（outputBufferIndex，假）;
如果（outBuffInfo.flags ==媒体codec.BUFFER_FLAG_END_OF_STREAM）
{
codec.flush（）;
codec.stop（）;
codec.release（）;
打破;
}
// outputBufferIndex = codec.dequeueOutputBuffer（outBuffInfo，1000）;
//logger.log(Level.INFO,"nextOutputBuffer =+ outputBufferIndex）;
//}
}而（outBuffInfo.flags =媒体codec.BUFFER_FLAG_END_OF_STREAM！）;
fis.close（）;
fos.flush（）;
fos.close（）;
}
赶上（例外五）
{
//Logger.getLogger(MainActivity.class.getSimpleName()).log(Level.INFO，codeC错误，E）;
}
//logger.log(Level.INFO,"Done）;
返回null;
}
}。执行（）;
}
解决方案
您需要选择一个容器它。我preFER ADTS。
复制的有效载荷数据到阿雷那是你的容器足够大，只需添加上你的位。所以冲刷互联网为我的解决方案后，我工作过的一些片段到位
办法fillInADTSHeader
配置=（configParams [0]＆GT;＆GT; 3）及0x1F的;
frequency_index =（this.configParams [0]放大器;为0x7）＆LT;＆LT; 1 | （this.configParams [1]≥大于7）及为0x1;
channel_config =（this.configParams [1]≥→3）及0xF的;
INT finallength = EN coded_length + 7;
EN codedByteArray [0] =（字节）0xFF的;
EN codedByteArray [1] =（字节）的0xf1;
EN codedByteArray [2] =（字节）（（（资料 - 1） - ;＆10 6）+（frequency_index＆其中; 2）+（channel_config＆GT;＆→2））;
EN codedByteArray [3] =（字节）（（（channel_config＆安培; 0x3中）所述;＆10 6）+（finallength＆GT;＆GT; 11））;
EN codedByteArray [4] =（字节）（（finallength＆安培; 0x7ff）＆GT;→3）;
EN codedByteArray [5] =（字节）（（（finallength和7）其中;小于5）+ 0x1F的）;
EN codedByteArray [6] =（字节）0xFC有;
使用类似
字节chunkADTS [] =新的字节[info.size + 7]。
fillInADTSHeader（chunkADTS，info.size）;
outputBuffers [BR]获得（chunkADTS，7，info.size）;
buffer.pushData（chunkADTS）;
在Shoutcast的应该扮演，等等...
I am using a media codec class in Android (Jelly Bean) to encode PCM format to AAC. The file was encoded but no music player is able to play that file. I was not able to find any working code or proper documentation on the net.
This is my code:
public void doConvert()
{
new AsyncTask<Void, Void, Void>()
{
@Override
protected Void doInBackground(Void... params)
{
try
{
int codecCount = MediaCodecList.getCodecCount();
for ( int i=0; i < codecCount; i++)
{
MediaCodecInfo info = MediaCodecList.getCodecInfoAt(i);
Logger.getLogger(MainActivity.class.getSimpleName()).log(Level.INFO, info.getName());
for ( String type : info.getSupportedTypes() )
{
Logger.getLogger(MainActivity.class.getSimpleName()).log(Level.INFO, type);
}
}
File inputFile = new File( Environment.getExternalStorageDirectory().getAbsolutePath()+"/Download/Ghajini27_Mono_8Khz.wav");
//File inputFile = new File( sampleFD.get);
Log.e("File", String.valueOf(inputFile.length()));
FileInputStream fis = new FileInputStream(inputFile);
fis.skip(44);//remove wav header
File outputFile = new File( Environment.getExternalStorageDirectory().getAbsolutePath()+"/Download/out.m4a");
if ( outputFile.exists()) outputFile.delete();
FileOutputStream fos = new FileOutputStream(outputFile);
//BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(outputFile));
MediaCodec codec = MediaCodec.createEncoderByType("audio/mp4a-latm");
MediaFormat outputFormat = MediaFormat.createAudioFormat("audio/mp4a-latm", 22050, 1);
outputFormat.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC);
// outputFormat.setInteger(MediaFormat.KEY_CHANNEL_MASK, AudioFormat.CHANNEL_CONFIGURATION_MONO);
outputFormat.setInteger(MediaFormat.KEY_BIT_RATE, 22050 );
outputFormat.setInteger(MediaFormat.KEY_CHANNEL_COUNT, 1);
//outputFormat.setLong(MediaFormat.KEY_MAX_INPUT_SIZE, inputFile.length());
double durationInMs = (inputFile.length()/16000)*1000;
Log.e("duration",String.valueOf((long)durationInMs));
outputFormat.setLong(MediaFormat.KEY_DURATION, (long)durationInMs );
codec.configure(outputFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE );
codec.start();
ByteBuffer[] inputBuffers = codec.getInputBuffers();
ByteBuffer[] outputBuffer = codec.getOutputBuffers();
boolean hasMoreData = true;
MediaCodec.BufferInfo outBuffInfo = new BufferInfo();
byte readBuffer[] = new byte[48000];
byte writeBuffer[] = new byte[48000];
do
{
int nextBuffer = codec.dequeueInputBuffer(5000);
Log.e("NextBuffer","nextInputBuffer = "+nextBuffer);
if ( nextBuffer >= 0 )
{
ByteBuffer inBuf = inputBuffers[nextBuffer];
inBuf.clear();
int bytesRead = fis.read( readBuffer,0, inBuf.capacity() );
Log.e("bytesread","Read = "+bytesRead);
if ( bytesRead < inBuf.capacity() )
{
hasMoreData = false;
}
inBuf.put(readBuffer, 0, bytesRead);
codec.queueInputBuffer(nextBuffer, 0, bytesRead, 0, hasMoreData?0:MediaCodec.BUFFER_FLAG_END_OF_STREAM);
}
int outputBufferIndex = codec.dequeueOutputBuffer( outBuffInfo, 3000);
/* logger.log(Level.INFO,"nextOutputBuffer = "+outputBufferIndex);
logger.log(Level.INFO,"outBuffInfo offset = "+outBuffInfo.offset);
logger.log(Level.INFO,"outBuffInfo size = "+outBuffInfo.size);
logger.log(Level.INFO,"outBuffInfo flags = "+outBuffInfo.flags);*/
//while ( outputBufferIndex > -1 )
//{
outputBuffer[outputBufferIndex].position(outBuffInfo.offset);
outputBuffer[outputBufferIndex].get(writeBuffer,0,outBuffInfo.size);
fos.write(writeBuffer,0, outBuffInfo.size);
// logger.log(Level.INFO,"Writing = "+outBuffInfo.size+" bytes");
outputBuffer[outputBufferIndex].clear();
codec.releaseOutputBuffer(outputBufferIndex, false);
if ( outBuffInfo.flags == MediaCodec.BUFFER_FLAG_END_OF_STREAM )
{
codec.flush();
codec.stop();
codec.release();
break;
}
//outputBufferIndex = codec.dequeueOutputBuffer( outBuffInfo, 1000 );
//logger.log(Level.INFO,"nextOutputBuffer = "+outputBufferIndex);
//}
} while (outBuffInfo.flags != MediaCodec.BUFFER_FLAG_END_OF_STREAM);
fis.close();
fos.flush();
fos.close();
}
catch ( Exception e)
{
//Logger.getLogger(MainActivity.class.getSimpleName()).log(Level.INFO, "Codec Error",e);
}
//logger.log(Level.INFO,"Done");
return null;
}
}.execute();
}
解决方案
You'll need to choose a container for it. I prefer adts.
Copy the the payload data into an aray that is large enough for your container, just add on your bits. So after scouring the internet for my solution I worked some snippet into place
method 'fillInADTSHeader'
profile =( configParams[0]>>3 )&0x1f;
frequency_index = (this.configParams[0]&0x7) <<1 | (this.configParams[1]>>7) &0x1;
channel_config = (this.configParams[1]>>3) &0xf;
int finallength = encoded_length + 7;
ENCodedByteArray[0] = (byte) 0xff;
ENCodedByteArray[1] = (byte) 0xf1;
ENCodedByteArray[2] = (byte) ( ((profile - 1) << 6) + (frequency_index << 2) +(channel_config >> 2));
ENCodedByteArray[3] = (byte) (((channel_config & 0x3) << 6) + (finallength >> 11));
ENCodedByteArray[4] = (byte)( (finallength & 0x7ff) >> 3);
ENCodedByteArray[5] = (byte) (((finallength & 7) << 5) + 0x1f) ;
ENCodedByteArray[6] = (byte) 0xfc;
Using something like
byte chunkADTS[]=new byte[info.size + 7];
fillInADTSHeader(chunkADTS,info.size);
outputBuffers[bR].get(chunkADTS,7,info.size);
buffer.pushData(chunkADTS);
Should play in shoutcast, etc...
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