如何从AAC-ADTS头构建编解码器特定数据（CSD）？

Question

How to construct CSD data from ADTS header? I can create ADTS header for CSD data, but how to do the reverse?

/* function to construct ADTS header from CSD
 * header_info - contains CSD
 * frameLength - total frame size */    
void addHeaderADTS(uint8_t header_info[], uint32_t frameLength) {

int profile = (csd_data[0] >> 3) & 0x1F;
int frequency_idx = ((csd_data[0] & 0x7) << 1) | ((csd_data[1] >> 7) & 0x1);
int channels = (csd_data[1] >> 3) & 0xF;

header_info[0] = 0xFF;
header_info[1] = 0xF1;
header_info[2] = (((profile - 1) << 6) + (frequency_idx << 2) + (channels >> 2));
header_info[3] = (((channels & 3) << 6) + (frameLength >> 11));
header_info[4] = ((frameLength & 0x7FF) >> 3);
header_info[5] = (((frameLength & 7) << 5) + 0x1F);
header_info[6] = 0xFC;
return;

}

Answer 1

Found. CSD data constructed using MakeAACCodecSpecificData function in avc_utils.cpp