Function append_wave

src/models/seed_vc/session.cpp:505–507

        std::fill(chunk_mel.begin(), chunk_mel.end(), 0.0F);
        for (int64_t channel = 0; channel < channels; ++channel) {
            const auto source = mel.begin() + static_cast<std::ptrdiff_t>(channel * frames + source_start);
            std::copy_n(
                source,
                copy_frames,
                chunk_mel.begin() + static_cast<std::ptrdiff_t>(channel * graph_frames + target_start));