用C语言实现陷波法进行啸叫抑制的代码

以下是使用C语言实现陷波法进行啸叫抑制的代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define BUFFER_SIZE 1024

typedef struct {
    char ChunkID[4];
    uint32_t ChunkSize;
    char Format[4];
    char Subchunk1ID[4];
    uint32_t Subchunk1Size;
    uint16_t AudioFormat;
    uint16_t NumChannels;
    uint32_t SampleRate;
    uint32_t ByteRate;
    uint16_t BlockAlign;
    uint16_t BitsPerSample;
    char Subchunk2ID[4];
    uint32_t Subchunk2Size;
} WavHeader;

float b0 = 1.0, b1 = -1.0, a1 = -0.9;
float x1 = 0.0, y1 = 0.0;

int16_t apply_trap_filter(int16_t sample) {
    float x = (float)sample / (float)INT16_MAX;
    float y = b0 * x + b1 * x1 + a1 * y1;
    x1 = x;
    y1 = y;
    float value = y * (float)INT16_MAX;
    if (value > INT16_MAX) {
        value = INT16_MAX;
    } else if (value < INT16_MIN) {
        value = INT16_MIN;
    }
    return (int16_t)value;
}

int main(int argc, char **argv) {
    if (argc != 3) {
        printf("Usage: %s [input_file] [output_file]\n", argv[0]);
        return 1;
    }
    char *input_file = argv[1];
    char *output_file = argv[2];
    FILE *fp = fopen(input_file, "rb");
    if (!fp) {
        printf("Failed to open input file: %s\n", input_file);
        return 1;
    }
    fseek(fp, 0, SEEK_END);
    long file_size = ftell(fp);
    fseek(fp, 0, SEEK_SET);
    WavHeader header;
    fread(&header, sizeof(header), 1, fp);
    if (header.ChunkID[0] != 'R' || header.ChunkID[1] != 'I' || header.ChunkID[2] != 'F' || header.ChunkID[3] != 'F' ||
        header.Format[0] != 'W' || header.Format[1] != 'A' || header.Format[2] != 'V' || header.Format[3] != 'E' ||
        header.Subchunk1ID[0] != 'f' || header.Subchunk1ID[1] != 'm' || header.Subchunk1ID[2] != 't' || header.Subchunk1ID[3] != ' ' ||
        header.Subchunk2ID[0] != 'd' || header.Subchunk2ID[1] != 'a' || header.Subchunk2ID[2] != 't' || header.Subchunk2ID[3] != 'a') {
        printf("Invalid wav file format\n");
        fclose(fp);
        return 1;
    }
    uint32_t sample_rate = header.SampleRate;
    uint16_t bits_per_sample = header.BitsPerSample;
    uint32_t num_samples = header.Subchunk2Size / (bits_per_sample / 8) / header.NumChannels;
    int16_t *samples = (int16_t *)malloc(num_samples * sizeof(int16_t));
    fread(samples, sizeof(int16_t), num_samples, fp);
    fclose(fp);
    int16_t *filtered_samples = (int16_t *)malloc(num_samples * sizeof(int16_t));
    for (int i = 0; i < num_samples; i++) {
        filtered_samples[i] = apply_trap_filter(samples[i]);
    }
    free(samples);
    fp = fopen(output_file, "wb");
    if (!fp) {
        printf("Failed to open output file: %s\n", output_file);
        free(filtered_samples);
        return 1;
    }
    fwrite(&header, sizeof(header), 1, fp);
    fwrite(filtered_samples, sizeof(int16_t), num_samples, fp);
    fclose(fp);
    free(filtered_samples);
    return 0;
}

这段代码实现了使用陷波法对wav文件进行啸叫抑制的功能。你可以根据自己的需求进行修改。