使用fdkaac编码

来源：互联网发布：算法和模型的区别编辑：程序博客网时间：2024/05/03 00:44

fdkaac是一个目前效率很高的aac编解码库。

使用该库编码aac的流程如下：

1，初始化aac库

HANDLE_AACENCODER   m_aacEncHandle;uint8_t m_aacOutbuf[20480];        if (aacEncOpen(&m_aacEncHandle, 0, channels) != AACENC_OK) {printf("Unable to open fdkaac encoder\n");return -1;}if (aacEncoder_SetParam(m_aacEncHandle, AACENC_AOT, 2) != AACENC_OK) {  //aac lcprintf("Unable to set the AOT\n");return -1;}if (aacEncoder_SetParam(m_aacEncHandle, AACENC_SAMPLERATE, sampleRate) != AACENC_OK) {printf("Unable to set the AOT\n");return -1;}if (aacEncoder_SetParam(m_aacEncHandle, AACENC_CHANNELMODE, MODE_2) != AACENC_OK) {  //2 channleprintf("Unable to set the channel mode\n");return -1;}if (aacEncoder_SetParam(m_aacEncHandle, AACENC_BITRATE, bitRate) != AACENC_OK) {printf("Unable to set the bitrate\n");return -1;}if (aacEncoder_SetParam(m_aacEncHandle, AACENC_TRANSMUX, 2) != AACENC_OK) { //0-raw 2-adtsprintf("Unable to set the ADTS transmux\n");return -1;}if (aacEncEncode(m_aacEncHandle, NULL, NULL, NULL, NULL) != AACENC_OK) {printf("Unable to initialize the encoder\n");return -1;}AACENC_InfoStruct info = { 0 };if (aacEncInfo(m_aacEncHandle, &info) != AACENC_OK) {printf("Unable to get the encoder info\n");return -1;}

2，对每一帧音频数据（pcm格式）调用编码函数

AACENC_BufDesc in_buf = { 0 }, out_buf = { 0 };AACENC_InArgs in_args = { 0 };AACENC_OutArgs out_args = { 0 };int in_identifier = IN_AUDIO_DATA;int in_elem_size = 2;  in_args.numInSamples = size / 2;  //size为pcm字节数in_buf.numBufs = 1;in_buf.bufs = &pData;  //pData为pcm数据指针in_buf.bufferIdentifiers = &in_identifier;in_buf.bufSizes = &size;in_buf.bufElSizes = &in_elem_size;int out_identifier = OUT_BITSTREAM_DATA;void *out_ptr = m_aacOutbuf;int out_size = sizeof(m_aacOutbuf);int out_elem_size = 1;out_buf.numBufs = 1;out_buf.bufs = &out_ptr;out_buf.bufferIdentifiers = &out_identifier;out_buf.bufSizes = &out_size;out_buf.bufElSizes = &out_elem_size;if ((aacEncEncode(m_aacEncHandle, &in_buf, &out_buf, &in_args, &out_args)) != AACENC_OK) {fprintf(stderr, "Encoding aac failed\n");return NVSTITCH_ERROR_GENERAL;}if (out_args.numOutBytes == 0)return NVSTITCH_ERROR_GENERAL;fwrite(outbuf, 1, out_args.numOutBytes, out); //编码后的aac数据存在outbuf中，大小为out_args.numOutBytes

3，最后销毁aac对象

aacEncClose(&m_aacEncHandle);

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