实现：
public static void addADTStoPacket(byte[] packet, int packetLen, int chancfg) {
int profile = 2; //AAC LC，MediaCodecInfo.CodecProfileLevel.AACObjectLC;
int freqIdx = 4; //见后面注释avpriv_mpeg4audio_sample_rates中441000对应的数组下标，来自ffmpeg源码
// int chanCfg = 1; //见后面注释channel_configuration，AudioFormat.CHANNEL_IN_MONO 单声道(声道数量)
int chanCfg = chancfg; //见后面注释channel_configuration，AudioFormat.CHANNEL_IN_MONO 单声道(声道数量)
/*int avpriv_mpeg4audio_sample_rates[] = {96000, 88200, 64000, 48000, 44100, 32000,24000, 22050, 16000, 12000, 11025, 8000, 7350};
channel_configuration: 表示声道数chanCfg
0: Defined in AOT Specifc Config
1: 1 channel: front-center
2: 2 channels: front-left, front-right
3: 3 channels: front-center, front-left, front-right
4: 4 channels: front-center, front-left, front-right, back-center
5: 5 channels: front-center, front-left, front-right, back-left, back-right
6: 6 channels: front-center, front-left, front-right, back-left, back-right, LFE-channel
7: 8 channels: front-center, front-left, front-right, side-left, side-right, back-left, back-right, LFE-channel
8-15: Reserved
*/
// fill in ADTS data
packet[0] = (byte)0xFF;
// packet[1] = (byte)0xF9;
packet[1] = (byte)0xF1;
packet[2] = (byte)(((profile-1)<<6) + (freqIdx<<2) +(chanCfg>>2));
packet[3] = (byte)(((chanCfg&3)<<6) + (packetLen>>11));
packet[4] = (byte)((packetLen&0x7FF) >> 3);
packet[5] = (byte)(((packetLen&7)<<5) + 0x1F);
packet[6] = (byte)0xFC;
}
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