Windows编译及使用fdk-aac编码器

1. 源码获取
2. git clone https://github.com/mstorsjo/fdk-aac.git
3. cd fdk-aac
4. git checkout v2.0.3 #选择稳定版本
5. 编译
6. 源码路径：D:\fdk-aac
7. 编译路径：D:\fdk-aac\build
8. 打开cmake分别选择源码路径和编译路径，点击Configure和Generate，执行成功之后打开fdk-aac.sln用vs2017编译即可，编译完之后运行install（管理员运行）
9. pcm编码aac 示例
10. 代码实现

#include <fdk-aac/aacenc_lib.h>
#include

typedef void(AacFrameCallback)(uint8_t aac_data, size_t aac_size, void* user_data);

class AACEncoder {
public:
AACEncoder() = default;
~AACEncoder();

    // 初始化AAC编码器
int init(int sample_rate, int channels, int audio_bitrate);// 接收PCM数据流并进行编码void receivePcmStream(const uint8_t* data, size_t size);// 清理资源void cleanup();// aac音频数据回调void setCallback(AacFrameCallback callback, void* user_data = nullptr);

private:
HANDLE_AACENCODER encoder_ = nullptr; // 编码器句柄
int frame_samples_ = 0; // 每帧需要的样本数（单声道）
short pcm_buffer_ = nullptr; // PCM 缓冲区（存储累积的样本）
size_t buffer_size_ = 0; // 缓冲区当前存储的样本数（总样本 = buffer_size * 声道数）
int channels_ = 2; // 默认PCM声道数为2（立体声）
AacFrameCallback callback_;
void user_data_;
};

实现

#include “AACEncoder.h”
#include <stdio.h>

AACEncoder::~AACEncoder()
{
cleanup();
}

int AACEncoder::init(int sample_rate, int channels, int audio_bitrate)
{
AACENC_ERROR err;

// 初始化AAC编码器
if ((err = aacEncOpen(&encoder_, 0, channels)) != AACENC_OK)
{fprintf(stderr, "aacEncOpen failed, error code: %d\n", err);return -1;
}// 设置编码参数
if ((err = aacEncoder_SetParam(encoder_, AACENC_AOT, AOT_AAC_LC)) != AACENC_OK|| (err = aacEncoder_SetParam(encoder_, AACENC_SAMPLERATE, sample_rate)) != AACENC_OK|| (err = aacEncoder_SetParam(encoder_, AACENC_CHANNELMODE, channels == 1 ? MODE_1 : MODE_2)) != AACENC_OK|| (err = aacEncoder_SetParam(encoder_, AACENC_CHANNELORDER, 1)) != AACENC_OK ||  // WAV通道顺序(err = aacEncoder_SetParam(encoder_, AACENC_BITRATE, audio_bitrate)) != AACENC_OK)
{fprintf(stderr, "Parameter setting failed, error code: %d\n", err);aacEncClose(&encoder_);return -1;
}// 初始化编码器
if ((err = aacEncEncode(encoder_, nullptr, nullptr, nullptr, nullptr)) != AACENC_OK)
{fprintf(stderr, "Encoder initialization failed, error code: %d\n", err);aacEncClose(&encoder_);return -1;
}// 获取编码器信息
AACENC_InfoStruct info = {0};
if ((err = aacEncInfo(encoder_, &info)) != AACENC_OK)
{fprintf(stderr, "Failed to get encoder info, error code: %d\n", err);aacEncClose(&encoder_);return -1;
}frame_samples_ = info.frameLength;
channels_      = channels;// 分配PCM缓冲区
pcm_buffer_ = (short *)malloc(frame_samples_ * channels * 2 * sizeof(short));
if (!pcm_buffer_)
{fprintf(stderr, "PCM buffer allocation failed\n");aacEncClose(&encoder_);return -1;
}return 0;

}

void AACEncoder::setCallback(AacFrameCallback callback, void *user_data)
{
callback_ = callback;
user_data_ = user_data;
}

void AACEncoder::receivePcmStream(const uint8_t *data, size_t size)
{
if (!encoder_)
{
fprintf(stderr, “Encoder not initialized\n”);
return;
}

// 将输入的uint8_t数据转换为short数组（假设小端格式）
size_t num_samples = size / sizeof(short);
short *new_samples = (short *)data;// 将新数据追加到缓冲区
memcpy(pcm_buffer_ + buffer_size_, new_samples, size);
buffer_size_ += num_samples;// 计算每帧所需的总样本数（单通道样本数 * 通道数）
const size_t samples_per_frame = frame_samples_ * channels_;// 如果有足够的数据进行编码
while (buffer_size_ >= samples_per_frame)
{AACENC_BufDesc in_buf = {0}, out_buf = {0};AACENC_InArgs  in_args  = {0};AACENC_OutArgs out_args = {0};unsigned char  temp_aac_buffer[20480];  // 临时AAC输出缓冲区int in  = 2;int out = 1;// 输入设置void *in_ptr[]           = {pcm_buffer_};int   in_size[]          = {(int)(samples_per_frame * sizeof(short))};int   in_ident[]         = {IN_AUDIO_DATA};in_args.numInSamples     = frame_samples_ * channels_;  // 总样本数in_buf.numBufs           = 1;in_buf.bufs              = in_ptr;in_buf.bufferIdentifiers = in_ident;in_buf.bufSizes          = in_size;in_buf.bufElSizes        = ∈// 输出设置void *out_ptr[]           = {temp_aac_buffer};int   out_size[]          = {sizeof(temp_aac_buffer)};int   out_ident[]         = {OUT_BITSTREAM_DATA};out_buf.numBufs           = 1;out_buf.bufs              = out_ptr;out_buf.bufferIdentifiers = out_ident;out_buf.bufSizes          = out_size;out_buf.bufElSizes        = &out;// 执行编码AACENC_ERROR err;if ((err = aacEncEncode(encoder_, &in_buf, &out_buf, &in_args, &out_args)) != AACENC_OK){fprintf(stderr, "Encoding failed, error code: %d\n", err);break;}// 如果有有效的AAC数据，调用回调函数if (out_args.numOutBytes > 0 && callback_){callback_(temp_aac_buffer, out_args.numOutBytes, user_data_);}// 将剩余的数据移到缓冲区头部buffer_size_ -= samples_per_frame;if (buffer_size_ > 0){memmove(pcm_buffer_, pcm_buffer_ + samples_per_frame, buffer_size_ * sizeof(short));}
}

}

void AACEncoder::cleanup()
{
if (encoder_)
{
AACENC_BufDesc in_buf = {0}, out_buf = {0};
AACENC_InArgs in_args = {0};
AACENC_OutArgs out_args = {0};
unsigned char aac_buffer[20480];
in_args.numInSamples = -1;

    void *out_ptr[]           = {aac_buffer};int   out_size[]          = {sizeof(aac_buffer)};int   out_ident[]         = {OUT_BITSTREAM_DATA};out_buf.numBufs           = 1;out_buf.bufs              = out_ptr;out_buf.bufferIdentifiers = out_ident;out_buf.bufSizes          = out_size;// 处理剩余的编码数据while (aacEncEncode(encoder_, &in_buf, &out_buf, &in_args, &out_args) == AACENC_OK){// 如果有有效的AAC数据，调用回调函数if (out_args.numOutBytes > 0 && callback_){callback_(aac_buffer, out_args.numOutBytes, user_data_);}}aacEncClose(&encoder_);free(pcm_buffer_);encoder_ = nullptr;
}

}