decode.cpp

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#include "stdafx.h"

class calculate_peak_process : public threaded_process_callback {
public:
    calculate_peak_process(metadb_handle_list_cref items) : m_items(items), m_peak() {}
    void on_init(HWND p_wnd) {}
    void run(threaded_process_status & p_status,abort_callback & p_abort) {
        try {
            const t_uint32 decode_flags = input_flag_no_seeking | input_flag_no_looping; // tell the decoders that we won't seek and that we don't want looping on formats that support looping.
            input_helper input;
            for(t_size walk = 0; walk < m_items.get_size(); ++walk) {
                p_abort.check(); // in case the input we're working with fails at doing this
                p_status.set_progress(walk, m_items.get_size());
                p_status.set_progress_secondary(0);
                p_status.set_item_path( m_items[walk]->get_path() );
                input.open(NULL, m_items[walk], decode_flags, p_abort);
                
                double length;
                { // fetch the track length for proper dual progress display;
                    file_info_impl info;
                    // input.open should have preloaded relevant info, no need to query the input itself again.
                    // Regular get_info() may not retrieve freshly loaded info yet at this point (it will start giving the new info when relevant info change callbacks are dispatched); we need to use get_info_async.
                    if (m_items[walk]->get_info_async(info)) length = info.get_length();
                    else length = 0;
                }

                audio_chunk_impl_temporary l_chunk;
                double decoded = 0;
                while(input.run(l_chunk, p_abort)) { // main decode loop
                    m_peak = l_chunk.get_peak(m_peak);
                    if (length > 0) { // don't bother for unknown length tracks
                        decoded += l_chunk.get_duration();
                        if (decoded > length) decoded = length;
                        p_status.set_progress_secondary_float(decoded / length);
                    }
                    p_abort.check(); // in case the input we're working with fails at doing this
                }
            }
        } catch(std::exception const & e) {
            m_failMsg = e.what();
        }
    }
    void on_done(HWND p_wnd,bool p_was_aborted) {
        if (!p_was_aborted) {
            if (!m_failMsg.is_empty()) {
                popup_message::g_complain("Peak scan failure", m_failMsg);
            } else {
                pfc::string_formatter result;
                result << "Value: " << m_peak << "\n\n";
                result << "Scanned items:\n";
                for(t_size walk = 0; walk < m_items.get_size(); ++walk) {
                    result << m_items[walk] << "\n";
                }
                popup_message::g_show(result,"Peak scan result");
            }
        }
    }
private:
    audio_sample m_peak;
    pfc::string8 m_failMsg;
    const metadb_handle_list m_items;
};

void RunCalculatePeak(metadb_handle_list_cref data) {
    try {
        if (data.get_count() == 0) throw pfc::exception_invalid_params();
        service_ptr_t<threaded_process_callback> cb = new service_impl_t<calculate_peak_process>(data);
        static_api_ptr_t<threaded_process>()->run_modeless(
            cb,
            threaded_process::flag_show_progress_dual | threaded_process::flag_show_item | threaded_process::flag_show_abort,
            core_api::get_main_window(),
            "Sample component: peak scan");
    } catch(std::exception const & e) {
        popup_message::g_complain("Could not start peak scan process", e);
    }
}