在linux下
FAACEncoder.java如下：
package com.comname.video.common.coder;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Arrays;
import java.util.List;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.comname.video.common.AvAttr;
import com.comname.video.common.Logs;
import com.comname.video.common.util.ByteUtil;
import com.comname.video.common.util.Os;
import com.sun.jna.Library;
import com.sun.jna.Memory;
import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.Union;
import com.sun.jna.ptr.IntByReference;
public class FAACEncoder extends IAudioEncoder {
private static final Log log = LogFactory.getLog(FAACEncoder.class);
protected static String lib_file;
static {
if (Os.window) {
lib_file = Os.moveLibrary("libfaac_dll.dll");
} else {
lib_file = Os.moveLibrary("libfaac.so");
}
}
private static int[] aac_samples = new int[]{96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350};//24000 11025
private static byte[] hisiHead = new byte[]{0x00, 0x01, 0x00, 0x00};
private boolean hisiHeader = false;
private String sim;
private int aacSampleRate = 16000;
private int aacChannels = 1;
private int aacSampleSizeInBits = 16;
private Pointer aacEncoder;
private int aacInputSamples, aacMaxOutputBytes;
private Memory accOutput;
private int mpegVersion = 2; //2-MPEG2 4-MPEG4
private int aacObjectType = 2; //1-MAIN 2-LOW 3-SSR 4-LTP
private int outputFormat = 1; //0=RAW 1=ADTS
private PcmResampler resampler;
private volatile boolean closed = false;
public static FAACEncoder create(String sim, byte[] aac, int sampleRate, int sampleFmt, int channels, boolean hisiHeader, AvAttr attr) {
FAACEncoder encoder = new FAACEncoder();
encoder.sim = sim;
encoder.hisiHeader = hisiHeader;
encoder.aacSampleSizeInBits = new int[] {16, 16, 32}[sampleFmt];
encoder.aacSampleRate = sampleRate;
encoder.aacChannels = channels;
if (aac != null && aac.length > 8) { //https://www.cnblogs.com/zhangxuan/p/8809245.html
String adts = ByteUtil.byteToBit(aac, hisiHeader ? 4 : 0, 4);
encoder.outputFormat = adts.startsWith("111111111111") ? 1 : 0; //adts以0xFFF开始
if (encoder.outputFormat == 1) {
char ID = adts.charAt(12); //MPEG标识符，0标识MPEG-4，1标识MPEG-2
// encoder.mpegVersion = ID == '1' ? 2 : 4;
int profile = Integer.valueOf(adts.substring(16, 18), 2);
if (ID == '1') {//MPEG2 profile 0-MAIN 1-LOW 2-SSR 3-LTP
encoder.aacObjectType = profile + 1;
} else if (profile>=1 && profile<=4) {//MPEG4 profile 0-NULL 1-MAIN 2-LOW 3-SSR 4-LTP 5-.....
encoder.aacObjectType = profile;
}
int sampling_frequency_index = Integer.valueOf(adts.substring(18, 22), 2);
encoder.aacSampleRate = aac_samples[sampling_frequency_index];
int channel_configuration = Integer.valueOf(adts.substring(23, 26), 2);
if (channel_configuration == 1 || channel_configuration == 2) {
encoder.aacChannels = channel_configuration;
}
if (attr != null) {
attr.setAudioSamplingRate(encoder.aacSampleRate);
attr.setAudioChannelNum(encoder.aacChannels);
}
}
}
return encoder;
}
@Override
public void start() throws Exception {
IntByReference inputSamples = new IntByReference(), maxOutputBytes = new IntByReference();
if (Os.window) {
this.aacEncoder = FAACLibraryWindow.INSTANCE.faacEncOpen(this.aacSampleRate, this.aacChannels, inputSamples, maxOutputBytes);
} else {
this.aacEncoder = FAACLibraryLinux.INSTANCE.faacEncOpen(this.aacSampleRate, this.aacChannels, inputSamples, maxOutputBytes);
}
this.aacInputSamples = inputSamples.getValue();
this.aacMaxOutputBytes = maxOutputBytes.getValue();
this.accOutput = new Memory(this.aacMaxOutputBytes);
if (Os.window) {
FAACLibraryWindow.FaacEncConfiguration cfg = FAACLibraryWindow.INSTANCE.faacEncGetCurrentConfiguration(this.aacEncoder);
cfg.mpegVersion = this.mpegVersion;//2-MPEG2 4-MPEG4
cfg.aacObjectType = this.aacObjectType;//1-MAIN 2-LOW 3-SSR 4-LTP
// cfg.useLfe = 1;// 0-NO 1-YES
// cfg.useTns = 0;// 0-NO 1-YES
// cfg.bitRate = 32000;//
// cfg.bandWidth = 32000;//6720
cfg.quantqual = 100;//0 Default=100 LOWER<100 HIGHER>100
cfg.outputFormat = this.outputFormat;//0=RAW 1=ADTS
cfg.inputFormat = this.aacSampleSizeInBits == 16 ? 1 : this.aacSampleSizeInBits == 24 ? 2 : this.aacSampleSizeInBits == 32 ? 3 : 4;
FAACLibraryWindow.INSTANCE.faacEncSetConfiguration(this.aacEncoder, cfg);
} else {
FAACLibraryLinux.FaacEncConfiguration cfg = FAACLibraryLinux.INSTANCE.faacEncGetCurrentConfiguration(this.aacEncoder);
System.out.println(cfg.union);
try {
if (cfg.union == null) {
cfg.union = new FAACLibraryLinux.FaacUnion();
}
} catch (Exception e) {
e.printStackTrace();
}
cfg.mpegVersion = this.mpegVersion;//2-MPEG2 4-MPEG4
cfg.aacObjectType = this.aacObjectType;//1-MAIN 2-LOW 3-SSR 4-LTP
// cfg.useLfe = 1;// 0-NO 1-YES
// cfg.useTns = 0;// 0-NO 1-YES
// cfg.bitRate = 32000;//
// cfg.bandWidth = 32000;//6720
cfg.quantqual = 100;//0 Default=100 LOWER<100 HIGHER>100
cfg.outputFormat = this.outputFormat;//0=RAW 1=ADTS
cfg.inputFormat = this.aacSampleSizeInBits == 16 ? 1 : this.aacSampleSizeInBits == 24 ? 2 : this.aacSampleSizeInBits == 32 ? 3 : 4;
FAACLibraryLinux.INSTANCE.faacEncSetConfiguration(this.aacEncoder, cfg);
}
this.pcmLen = (int) Math.ceil((1024 * 2 * 8000.0)/this.aacSampleRate);
if (this.aacSampleRate != 8000 || this.aacSampleSizeInBits != 16 || this.aacChannels != 1) {
this.resampler = new PcmResampler(this.pcmLen, this.aacChannels, this.aacSampleSizeInBits, this.aacSampleRate);
}
System.out.println("AAC编码参数 采样率:"+this.aacSampleRate+" 位数:"+this.aacSampleSizeInBits+" 通道数:"+this.aacChannels+" profile(1-MAIN 2-LOW 3-SSR 4-LTP):"+this.aacObjectType+" outputFormat(0-RAW 1-ADTS):"+this.outputFormat+" pcmLen:"+this.pcmLen);
Logs.sim(log, this.sim, "AAC编码参数 采样率:"+this.aacSampleRate+" 位数:"+this.aacSampleSizeInBits+" 通道数:"+this.aacChannels+" profile(1-MAIN 2-LOW 3-SSR 4-LTP):"+this.aacObjectType+" outputFormat(0-RAW 1-ADTS):"+this.outputFormat+" pcmLen:"+this.pcmLen);
}
public synchronized byte[] encode(byte[] pcm) throws Exception {
if (this.closed) return null;
if (this.resampler != null) {
pcm = this.resampler.resample(pcm);
}
int ret;
if (Os.window) {
ret = FAACLibraryWindow.INSTANCE.faacEncEncode(this.aacEncoder, pcm, this.aacInputSamples, this.accOutput, this.aacMaxOutputBytes);
} else {
ret = FAACLibraryLinux.INSTANCE.faacEncEncode(this.aacEncoder, pcm, this.aacInputSamples, this.accOutput, this.aacMaxOutputBytes);
}
if (ret > 0) {
if (hisiHeader) {
byte[] aac = new byte[4 + ret];
System.arraycopy(hisiHead, 0, aac, 0, hisiHead.length);
this.accOutput.read(0, aac, 4, ret);
return aac;
} else {
byte[] aac = new byte[ret];
this.accOutput.read(0, aac, 0, ret);
return aac;
}
}
return null;
}
public synchronized void release() throws Exception {
this.closed = true;
if (this.aacEncoder != null) {
if (Os.window) {
FAACLibraryWindow.INSTANCE.faacEncClose(this.aacEncoder);
} else {
FAACLibraryLinux.INSTANCE.faacEncClose(this.aacEncoder);
}
this.aacEncoder = null;
}
if (this.accOutput != null) {
// Native.free(Pointer.nativeValue(this.accOutput));
// Pointer.nativeValue(this.accOutput, 0);
accOutput.close();
this.accOutput = null;
}
if (this.resampler != null) {
this.resampler.release();
this.resampler = null;
}
}
@Override
public byte[] encode(short[] samples) throws Exception {
return null;
}
}
class PcmResampler {
private ByteArrayInputStream inputStream;
private ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
private AudioFormat sourceFormat, targetFormat;
private AudioInputStream sourceStream;
private byte[] pcm;
public PcmResampler(int pcmLen, int channels, int sampleSizeInBits, int sampleRate) {
this.pcm = new byte[pcmLen];
this.inputStream = new ByteArrayInputStream(pcm);
this.sourceFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 8000, 16, 1, 2, 0, false);
int frameSize = channels * sampleSizeInBits / 8;
this.targetFormat = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, sampleRate, sampleSizeInBits, channels, frameSize, 0, false);
this.sourceStream = new AudioInputStream(this.inputStream, this.sourceFormat, pcm.length / this.sourceFormat.getFrameSize());
}
public byte[] resample(byte[] pcm) throws Exception {
System.arraycopy(pcm, 0, this.pcm, 0, pcm.length);
AudioInputStream targetStream = AudioSystem.getAudioInputStream(this.targetFormat, this.sourceStream);
targetStream.transferTo(this.outputStream);
targetStream.close();
pcm = this.outputStream.toByteArray();
this.outputStream.reset();
this.inputStream.reset();
this.sourceStream.reset();
return pcm;
}
public void release() throws Exception {
if (this.sourceStream != null) {
this.sourceStream.close();
}
}
}
interface FAACLibraryWindow extends Library {
@SuppressWarnings("deprecation")
FAACLibraryWindow INSTANCE = Native.loadLibrary(FAACEncoder.lib_file, FAACLibraryWindow.class);
Pointer faacEncOpen(int sampleRate, int channels, IntByReference inputSamples, IntByReference maxOutputBytes);
FaacEncConfiguration faacEncGetCurrentConfiguration(Pointer hEncoder);
int faacEncSetConfiguration(Pointer hEncoder, FaacEncConfiguration configuration);
int faacEncEncode(Pointer hEncoder, byte[] inputBuffer, int samplesInput, Pointer outputBuffer, int bufferSize);
int faacEncClose(Pointer hEncoder);
public static class FaacEncConfiguration extends Structure {
public int version;
public Pointer name;
public Pointer copyright;
public int mpegVersion;
public int aacObjectType;
public int useLfe;
public int useTns;
public int bitRate;
public int bandWidth;
public int quantqual;
public int outputFormat;
public Pointer psymodellist;
public int psymodelidx;
public int inputFormat;
public int shortctl;
public int[] channel_map = new int[64];
public int pnslevel;
@Override
protected List<String> getFieldOrder() {
return Arrays.asList("version", "name", "copyright", "mpegVersion", "aacObjectType", "useLfe", "useTns", "bitRate", "bandWidth", "quantqual", "outputFormat",
"psymodellist", "psymodelidx", "inputFormat", "shortctl", "channel_map", "pnslevel");
}
}
}
interface FAACLibraryLinux extends Library {
@SuppressWarnings("deprecation")
FAACLibraryLinux INSTANCE = Native.loadLibrary(FAACEncoder.lib_file, FAACLibraryLinux.class);
Pointer faacEncOpen(int sampleRate, int channels, IntByReference inputSamples, IntByReference maxOutputBytes);
FaacEncConfiguration faacEncGetCurrentConfiguration(Pointer hEncoder);
int faacEncSetConfiguration(Pointer hEncoder, FaacEncConfiguration configuration);
int faacEncEncode(Pointer hEncoder, byte[] inputBuffer, int samplesInput, Pointer outputBuffer, int bufferSize);
int faacEncClose(Pointer hEncoder);
public static class FaacEncConfiguration extends Structure {
public int version;
public Pointer name;
public Pointer copyright;
public int mpegVersion;
public int aacObjectType;
public FaacUnion union = new FaacUnion();
// public int jointmode;
public int useLfe;
public int useTns;
public long bitRate;
public int bandWidth;
public long quantqual;
public int outputFormat;
public Pointer psymodellist;
public int psymodelidx;
public int inputFormat;
public int shortctl;
public int[] channel_map = new int[64];
public int pnslevel;
@Override
protected List<String> getFieldOrder() {
return Arrays.asList("version", "name", "copyright", "mpegVersion", "aacObjectType", "union", "useLfe", "useTns", "bitRate", "bandWidth", "quantqual", "outputFormat",
"psymodellist", "psymodelidx", "inputFormat", "shortctl", "channel_map", "pnslevel");
}
}
public static class FaacUnion extends Union {
public int jointmode;
public int allowMidside;
}
}
faac的C语言如下：
typedef struct faacEncConfiguration
{
/* config version */
int version;
/* library version */
char *name;
/* copyright string */
char *copyright;
/* MPEG version, 2 or 4 */
unsigned int mpegVersion;
/* AAC object type */
unsigned int aacObjectType;
union {
/* Joint coding mode */
unsigned int jointmode;
/* compatibility alias */
unsigned int allowMidside;
};
/* Use one of the channels as LFE channel */
unsigned int useLfe;
/* Use Temporal Noise Shaping */
unsigned int useTns;
/* bitrate / channel of AAC file */
unsigned long bitRate;
/* AAC file frequency bandwidth */
unsigned int bandWidth;
/* Quantizer quality */
unsigned long quantqual;
/* Bitstream output format (0 = Raw; 1 = ADTS) */
unsigned int outputFormat;
/* psychoacoustic model list */
psymodellist_t *psymodellist;
/* selected index in psymodellist */
unsigned int psymodelidx;
/*
PCM Sample Input Format
0 FAAC_INPUT_NULL invalid, signifies a misconfigured config
1 FAAC_INPUT_16BIT native endian 16bit
2 FAAC_INPUT_24BIT native endian 24bit in 24 bits (not implemented)
3 FAAC_INPUT_32BIT native endian 24bit in 32 bits (DEFAULT)
4 FAAC_INPUT_FLOAT 32bit floating point
*/
unsigned int inputFormat;
/* block type enforcing (SHORTCTL_NORMAL/SHORTCTL_NOSHORT/SHORTCTL_NOLONG) */
int shortctl;
/*
Channel Remapping
Default 0, 1, 2, 3 ... 63 (64 is MAX_CHANNELS in coder.h)
WAVE 4.0 2, 0, 1, 3
WAVE 5.0 2, 0, 1, 3, 4
WAVE 5.1 2, 0, 1, 4, 5, 3
AIFF 5.1 2, 0, 3, 1, 4, 5
*/
int channel_map[64];
int pnslevel;
} faacEncConfiguration, *faacEncConfigurationPtr;
测试类如下：
package com.comname.video;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import com.comname.video.common.coder.FAACEncoder;
import com.comname.video.common.util.ByteUtil;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
public class Test {
public static void main(String[] args) throws Exception {
System.out.println("start");
String hex = "FFF16C4060000001402280A37FF8852D";
byte[] aac = ByteUtil.hexToByte(hex);
FAACEncoder encoder = FAACEncoder.create("sim", aac, 8000, 0, 1, false, null);
encoder.start();
ByteBuf pcms = Unpooled.buffer();
pcms.writeBytes(getBytes("/opt/Programs/GpsVideo/log/aaaa.pcm"));
FileOutputStream fos = new FileOutputStream("./aaaa.aac");
while (pcms.readableBytes() > 0) {
byte[] pcm = new byte[Math.min(pcms.readableBytes(), encoder.pcmLen)];
pcms.readBytes(pcm);
aac = encoder.encode(pcm);
if (aac != null) {
fos.write(aac);
}
}
fos.flush();
fos.close();
encoder.release();
System.out.println("over");
while (true) {
Thread.sleep(1000);
}
}
public static byte[] getBytes(String filePath) {
byte[] buffer = null;
try {
File file = new File(filePath);
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
fis.close();
bos.close();
buffer = bos.toByteArray();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return buffer;
}
}
其中aaaa.pcm文件是采样率8000，16位单通道的PCM数据，可正常播放
生成的aaaa.aac播放都是杂音，请问是哪里出了问题？
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本文围绕视频编码的速率控制展开，介绍了Reaction Parameter、average activity和global complexity的作用。还详细说明了序列头的写入过程，包括序列开始码、水平垂直长度等内容，以及extension码流部分、显示扩展属性和用户数据的写入，最后提及开始对源数据流帧进行编码。
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