Method build_conditioning

src/models/heartmula/codec.cpp:1406–1420

            out[static_cast<size_t>(q * frames + t)] = codes[static_cast<size_t>(t * codebooks + q)];
        }
    }
    return out;
}

std::vector<int32_t> repeat_codes_to_length(
    const std::vector<int32_t> & codes_bqt,
    int64_t codebooks,
    int64_t frames,
    int64_t target_frames) {
    if (codebooks <= 0 || frames <= 0 || target_frames <= 0 ||
        static_cast<int64_t>(codes_bqt.size()) != codebooks * frames) {
        throw std::runtime_error("HeartCodec code repeat shape mismatch");
    }
    std::vector<int32_t> out(static_cast<size_t>(codebooks * target_frames), 0);
    for (int64_t q = 0; q < codebooks; ++q) {
        for (int64_t t = 0; t < target_frames; ++t) {
            out[static_cast<size_t>(q * target_frames + t)] =
                codes_bqt[static_cast<size_t>(q * frames + (t % frames))];