fdk-aac交叉编译与使用

简介

fdk-aac可用于aac编解码器，源码链接：

https://github.com/mstorsjo/fdk-aac

选择Tags下的一个稳定版本，如v2.0.2，进行下载

编译

解压压缩文件

tar -xvf fdk-aac-2.0.2.tar.gz

添加sigmastar_uclibc_config.cmake文件：

# 参考 https://cmake.org/cmake/help/v3.22/manual/cmake-toolchains.7.html#cross-compiling-for-linux
SET(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)# 指定交叉编译器路径
SET(TOOLCHAIN_DIR "/opt/sigmaStar/arm-buildroot-linux-uclibcgnueabihf-4.9.4-uclibc-1.0.31/")
set(TOOLCHAIN_HOST "${TOOLCHAIN_DIR}/bin/arm-buildroot-linux-uclibcgnueabihf")set(CMAKE_CXX_COMPILER ${TOOLCHAIN_HOST}-g++)
set(CMAKE_C_COMPILER   ${TOOLCHAIN_HOST}-gcc)SET(CMAKE_FIND_ROOT_PATH  ${TOOLCHAIN_DIR}${TOOLCHAIN_DIR}/include${TOOLCHAIN_DIR}/lib )# 从来不在指定目录下查找工具程序
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
# 只在指定目录下查找库文件
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
# 只在指定目录下查找头文件
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

添加编译脚本build.sh

#!/bin/bashROOT_PATH=`pwd`
TARGET_PATH=$ROOT_PATH/outputrm -rf output
rm -rf build
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$TARGET_PATH \-DCMAKE_BUILD_TYPE=Release \-DCMAKE_TOOLCHAIN_FILE=$ROOT_PATH/sigmastar_uclibc_config.cmake \-DFDK_AAC_INSTALL_CMAKE_CONFIG_MODULE=OFF\-DFDK_AAC_INSTALL_PKGCONFIG_MODULE=OFF\-DBUILD_SHARED_LIBS=OFFmake -j 3
make install

运行编译脚本

sh build.sh

编译结果

root@ubuntu:~/fdk-aac-2.0.2/output# tree
.
├── include
│   └── fdk-aac
│       ├── aacdecoder_lib.h
│       ├── aacenc_lib.h
│       ├── FDK_audio.h
│       ├── genericStds.h
│       ├── machine_type.h
│       └── syslib_channelMapDescr.h
└── lib└── libfdk-aac.a

拷贝include和lib到工程路径下

编码样例

#include <stdio.h>
#include <stdint.h>
#include <unistd.h>#include <stdlib.h>
#include "fdk-aac/aacenc_lib.h"typedef struct {HANDLE_AACENCODER encoder;int input_size;int out_size;
} AAC_ENCODE_INFO_t, *PAAC_ENCODE_INFO_t;int initEncoder(int sample_rate, int channels, PAAC_ENCODE_INFO_t encode_info)
{if (encode_info == NULL) {return -1;}int ret = -1;int bitrate = 64000;int vbr = 0;HANDLE_AACENCODER encoder = NULL;int aot = AOT_AAC_LC;int afterburner = 1;CHANNEL_MODE mode;AACENC_InfoStruct info = { 0 };int input_size;switch (channels) {case 1: mode = MODE_1;       break;case 2: mode = MODE_2;       break;case 3: mode = MODE_1_2;     break;case 4: mode = MODE_1_2_1;   break;case 5: mode = MODE_1_2_2;   break;case 6: mode = MODE_1_2_2_1; break;default:fprintf(stderr, "Unsupported WAV channels %d\n", channels);goto CleanUp;}if (aacEncOpen(&encoder, 0, channels) != AACENC_OK) {fprintf(stderr, "Unable to open encoder\n");goto CleanUp;}if (aacEncoder_SetParam(encoder, AACENC_AOT, aot) != AACENC_OK) {fprintf(stderr, "Unable to set the AOT\n");goto CleanUp;}if (aacEncoder_SetParam(encoder, AACENC_SAMPLERATE, sample_rate) != AACENC_OK) {fprintf(stderr, "Unable to set the sample rate\n");goto CleanUp;}if (aacEncoder_SetParam(encoder, AACENC_CHANNELMODE, mode) != AACENC_OK) {fprintf(stderr, "Unable to set the channel mode\n");goto CleanUp;}if (aacEncoder_SetParam(encoder, AACENC_CHANNELORDER, 1) != AACENC_OK) {fprintf(stderr, "Unable to set the wav channel order\n");goto CleanUp;}if (vbr != 0) {if (aacEncoder_SetParam(encoder, AACENC_BITRATEMODE, vbr) != AACENC_OK) {fprintf(stderr, "Unable to set the VBR bitrate mode\n");goto CleanUp;}} else {if (aacEncoder_SetParam(encoder, AACENC_BITRATE, bitrate) != AACENC_OK) {fprintf(stderr, "Unable to set the bitrate\n");goto CleanUp;}}// It is usually TT_MP4_ADTS and TT_MP4_RAWif (aacEncoder_SetParam(encoder, AACENC_TRANSMUX, TT_MP4_ADTS) != AACENC_OK) {fprintf(stderr, "Unable to set the ADTS transmux\n");goto CleanUp;;}if (aacEncoder_SetParam(encoder, AACENC_AFTERBURNER, afterburner) != AACENC_OK) {fprintf(stderr, "Unable to set the afterburner mode\n");goto CleanUp;;}if (aacEncEncode(encoder, NULL, NULL, NULL, NULL) != AACENC_OK) {fprintf(stderr, "Unable to initialize the encoder\n");goto CleanUp;;}if (aacEncInfo(encoder, &info) != AACENC_OK) {fprintf(stderr, "Unable to get the encoder info\n");goto CleanUp;;}ret = 0;printf( "info.maxOutBufBytes = %u, info.frameLength = %u\n", info.maxOutBufBytes, info.frameLength);// default bit width is 16, 16 / 8 = 2input_size = channels * 2 * info.frameLength;CleanUp:if (ret != 0) {if (encoder != NULL) {aacEncClose(&encoder);}} else {encode_info->encoder= encoder;encode_info->input_size = input_size;encode_info->out_size = info.maxOutBufBytes;}return ret;
}void deInitEncoder(HANDLE_AACENCODER encoder)
{aacEncClose(&encoder);
}void encodeFrame(HANDLE_AACENCODER encoder, const uint8_t* in_buffer, int in_size, uint8_t* out_buffer, int out_size, int* out_bytes)
{if (encoder == NULL || in_buffer == NULL || in_size == 0 || out_buffer == NULL || out_size == 0) {return;}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;int out_identifier = OUT_BITSTREAM_DATA;int out_elem_size;AACENC_ERROR err;// 2 bytes per sample pointin_args.numInSamples = in_size / 2;in_elem_size = 2;in_buf.numBufs = 1;in_buf.bufs = (void**)&in_buffer;in_buf.bufferIdentifiers = &in_identifier;in_buf.bufSizes = &in_size;in_buf.bufElSizes = &in_elem_size;out_elem_size = 1;out_buf.numBufs = 1;out_buf.bufs = (void**)&out_buffer;out_buf.bufferIdentifiers = &out_identifier;out_buf.bufSizes = &out_size;out_buf.bufElSizes = &out_elem_size;if ((err = aacEncEncode(encoder, &in_buf, &out_buf, &in_args, &out_args)) != AACENC_OK) {fprintf(stderr, "Encoding failed\n");}*out_bytes = out_args.numOutBytes;printf("out_args.numOutBytes = %d, out_args.numInSamples = %d\n", out_args.numOutBytes, out_args.numInSamples);
}

说明：

输入默认音频为8k采样率，单通道，16bit位宽的PCM格式，每秒数据为8000116/8=16000字节
编码后的aac数据为ADTS格式，可改变TT_MP4_ADTS为TT_MP4_RAW获取裸数据，也可以通过跳过ADTS帧头
info.maxOutBufBytes表示编码后的每帧的最大数据，当前为768字节
当前编码输出为固定的768字节，如果需要可变码率设置vbr为1-5，码率依次升高，编码输出长度为1-768字节
编码后的实际长度根据out_bytes 对输出数据进行存储
aac是1024个采样点数据进行一次编码，对应的PCM格式长度为2048字节，那么对应的aac帧率为16000/2048=7.813。由于AENC编码的数据不是刚好2048字节，通常为640字节，那么需要一个循环数组对数据进行存储，当长度满足input_size后再进行一次编码

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fdk-aac交叉编译与使用

简介

编译

编码样例

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