Question

我想使用FFMPEG将我的UUID变成独特的声音，但我不确定如何做到这一点。

所以现在我的UUID看起来像这样：'1e859915-bcdf-4862-8af2-bb43f04e2158'

就像UUID是唯一的一样，我想让它们全部变成独特的1-2秒音频文件。 FFMPEG可以这样做还是有不同的路线？是FFMPEG中的SINE功能还能做什么？

Answer 1

这是尝试将GUID中的每个半字节变成A4-C6范围内的音调。

它在WAVE中输出无符号8位PCM，不需要ffmpeg。该代码仅用于说明目的，随意添加适当的验证等。

#include <stdio.h>
#include <inttypes.h>
#include <math.h>

int main(void) {
    FILE* out;
    int duration = 2; // [s]
    int32_t rate = 44100; // [Hz]
    uint8_t guid[] = {0x1e, 0x85, 0x99, 0x15, 0xbc, 0xdf, 0x48, 0x62, 0x8a, 0xf2, 0xbb, 0x43, 0xf0, 0x4e, 0x21, 0x58};
    int32_t samples_per_nibble = (float) duration / 32 * rate;
    int32_t total_samples = samples_per_nibble * 32;
    int16_t c16;
    int32_t c32;

    if ((out = fopen("test.wav", "wb")) == NULL) {
        return 1;
    }

    // WAV header
    // ChunkID
    fputs("RIFF", out);
    // ChunkSize
    c32 = 36 + total_samples;
    fwrite(&c32, 4, 1, out);
    // Format
    fputs("WAVE", out);
    // Subchunk1ID
    fputs("fmt ", out);
    // Subchunk1Size
    c32 = 16;
    fwrite(&c32, 4, 1, out);
    // AudioFormat
    c16 = 1;
    fwrite(&c16, 2, 1, out);
    // NumChannels
    c16 = 1;
    fwrite(&c16, 2, 1, out);
    // SampleRate
    c32 = rate;
    fwrite(&c32, 4, 1, out);
    // ByteRate
    c32 = rate;
    fwrite(&c32, 4, 1, out);
    // BlockAlign
    c16 = 1;
    fwrite(&c16, 2, 1, out);
    // BitsPerSample
    c16 = 8;
    fwrite(&c16, 2, 1, out);
    // Subchunk2ID
    fputs("data", out);
    // Subchunk2Size
    c32 = total_samples;
    fwrite(&c32, 4, 1, out);

    // Data
    for (int b = 0; b < 16; b++) {
        // for each byte in the GUID
        for (int n = 0; n < 2; n++) {
            // for each nibble
            uint8_t nibble = (n ? guid[b] >> 4 : guid[b]) & 0x0f;
            // go nibble steps above A4
            float frequency = 440.0 * pow(1.059463094359, nibble);
            // write the samples
            for (int s = 0; s < samples_per_nibble; s++) {
                int sample = (sin(frequency * 2 * M_PI * s / rate) + 1) * 0.5 * 255;
                fputc(sample, out);
            }
        }
    }

    fclose(out);
    return 0;
}

使用FFMPEG将ID转换为Unique Sound

1 个答案: