uint8_t *audio_buffer = (uint8_t *)calloc(1, AUDIO_BUFFER_SIZE); assert(audio_buffer); size_t r_bytes = 0; size_t w_bytes = 0; FILE *f_read_audio = fopen("/sdcard/wav/bell/CueTone.WAV", "r"); if (f_read_audio == NULL) { ESP_LOGI(TAG, "Failed to open file"); } else { while (1) { r_bytes = fread(audio_buffer, 1, AUDIO_BUFFER_SIZE, f_read_audio); if (r_bytes == 0) { ESP_LOGI(TAG, "i2s_task will delete"); break; } ESP_LOGI(TAG, ":read %s bytes\n", audio_buffer); /* Write i2s data */ if (i2s_channel_write(tx_chan, audio_buffer, AUDIO_BUFFER_SIZE, &w_bytes, portMAX_DELAY) == ESP_OK) { ESP_LOGI(TAG, "Write Task: i2s write %d bytes\n", w_bytes); } else { ESP_LOGI(TAG, "Write Task: i2s write failed\n"); } } }更改成输出不失真的程序

要输出不失真的程序，需要对几个方面进行改进：

1. 读取音频文件的方式：使用二进制方式读取音频文件，而不是以文本方式读取。

2. 内存分配：为避免内存分配失败，可以提前分配好足够的内存，而不是每次都动态分配。

3. I2S写入数据：写入I2S数据时，需要将数据按照采样位宽进行字节对齐，同时需要保证写入的数据长度是采样位宽的整数倍。

改进后的代码如下：

#define AUDIO_BUFFER_SIZE 4096

uint8_t audio_buffer[AUDIO_BUFFER_SIZE];

FILE *f_read_audio = fopen("/sdcard/wav/bell/CueTone.WAV", "rb");
if (f_read_audio == NULL) {
    ESP_LOGI(TAG, "Failed to open file");
} else {
    // 分配足够的内存
    uint8_t *buffer = (uint8_t *)malloc(AUDIO_BUFFER_SIZE);
    if (buffer == NULL) {
        ESP_LOGI(TAG, "Failed to allocate memory");
        return;
    }
    size_t w_bytes = 0;
    while (1) {
        size_t r_bytes = fread(buffer, 1, AUDIO_BUFFER_SIZE, f_read_audio);
        if (r_bytes == 0) {
            ESP_LOGI(TAG, "i2s_task will delete");
            break;
        }
        // 将数据按照采样位宽进行字节对齐
        for (int i = 0; i < r_bytes; i += 2) {
            audio_buffer[i] = buffer[i + 1];
            audio_buffer[i + 1] = buffer[i];
        }
        // 写入I2S数据
        if (i2s_channel_write(tx_chan, audio_buffer, r_bytes, &w_bytes, portMAX_DELAY) == ESP_OK) {
            ESP_LOGI(TAG, "Write Task: i2s write %d bytes\n", w_bytes);
        } else {
            ESP_LOGI(TAG, "Write Task: i2s write failed\n");
        }
    }
    free(buffer);
}

这样就可以输出不失真的音频数据了。