Function valid_frames_from_mask

src/models/chatterbox/s3gen_flow.cpp:216–242

void allocate_graph_resources(
    const engine::core::ExecutionContext & execution_context,
    ggml_cgraph * graph,
    ggml_gallocr_t & gallocr,
    const char * label) {
    gallocr = ggml_gallocr_new(ggml_backend_get_default_buffer_type(execution_context.backend()));
    if (gallocr == nullptr ||
        !ggml_gallocr_reserve(gallocr, graph) ||
        !ggml_gallocr_alloc_graph(gallocr, graph)) {
        if (gallocr != nullptr) {
            ggml_gallocr_free(gallocr);
            gallocr = nullptr;
        }
        throw std::runtime_error(std::string("failed to allocate backend tensors for ") + label);
    }
}

int64_t valid_frames_from_mask(const std::vector<float> & mask, int64_t batch, int64_t frames) {
    if (batch <= 0 || frames <= 0) {
        throw std::runtime_error("S3 valid_frames_from_mask requires positive batch and frames");
    }
    if (static_cast<int64_t>(mask.size()) != batch * frames) {
        throw std::runtime_error("S3 mask size mismatch");
    }
    int64_t valid = 0;
    for (int64_t frame = 0; frame < frames; ++frame) {
        const float value = mask[static_cast<size_t>(frame)];
        if (value >= 0.5f) {
            ++valid;
            continue;
        }