ADI BF706从48K音频采样频率降低到8K音频采样频率以及将8K音频采样频率提高到48K音频采样频率的CCES C代码程序

下面是将48K音频采样频率降低到8K音频采样频率的CCES C代码程序：

#include <stdio.h>

#define INPUT_SAMPLE_RATE 48000
#define OUTPUT_SAMPLE_RATE 8000
#define SAMPLES_PER_FRAME 1024

void resample_48k_to_8k(float* input, float* output, int num_samples) {
    float ratio = (float)OUTPUT_SAMPLE_RATE / INPUT_SAMPLE_RATE;
    int num_output_samples = num_samples * ratio;
    
    for (int i = 0; i < num_output_samples; i++) {
        float index = i / ratio;
        int index_floor = (int)index;
        float index_fraction = index - index_floor;
        
        output[i] = input[index_floor] * (1 - index_fraction) + input[index_floor + 1] * index_fraction;
    }
}

int main() {
    // 48K audio input samples
    float input_samples[SAMPLES_PER_FRAME] = { /* input samples here */ };
    
    // 8K audio output samples
    float output_samples[SAMPLES_PER_FRAME * (OUTPUT_SAMPLE_RATE / INPUT_SAMPLE_RATE)];
    
    resample_48k_to_8k(input_samples, output_samples, SAMPLES_PER_FRAME);
    
    // Print the output samples
    for (int i = 0; i < SAMPLES_PER_FRAME * (OUTPUT_SAMPLE_RATE / INPUT_SAMPLE_RATE); i++) {
        printf("%f ", output_samples[i]);
    }
    
    return 0;
}

下面是将8K音频采样频率提高到48K音频采样频率的CCES C代码程序：

#include <stdio.h>

#define INPUT_SAMPLE_RATE 8000
#define OUTPUT_SAMPLE_RATE 48000
#define SAMPLES_PER_FRAME 1024

void resample_8k_to_48k(float* input, float* output, int num_samples) {
    float ratio = (float)OUTPUT_SAMPLE_RATE / INPUT_SAMPLE_RATE;
    int num_output_samples = num_samples * ratio;
    
    for (int i = 0; i < num_output_samples; i++) {
        float index = i / ratio;
        int index_floor = (int)index;
        float index_fraction = index - index_floor;
        
        output[i] = input[index_floor] * (1 - index_fraction) + input[index_floor + 1] * index_fraction;
    }
}

int main() {
    // 8K audio input samples
    float input_samples[SAMPLES_PER_FRAME] = { /* input samples here */ };
    
    // 48K audio output samples
    float output_samples[SAMPLES_PER_FRAME * (OUTPUT_SAMPLE_RATE / INPUT_SAMPLE_RATE)];
    
    resample_8k_to_48k(input_samples, output_samples, SAMPLES_PER_FRAME);
    
    // Print the output samples
    for (int i = 0; i < SAMPLES_PER_FRAME * (OUTPUT_SAMPLE_RATE / INPUT_SAMPLE_RATE); i++) {
        printf("%f ", output_samples[i]);
    }
    
    return 0;
}

在以上代码中，你需要替换注释部分的输入样本数据。这些代码使用线性插值的方法进行音频采样率的转换