dynamic_bitrate_helper.cpp

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#include "stdafx.h"

static unsigned g_query_settings()
{
    t_int32 temp;
    try {
        config_object::g_get_data_int32(standard_config_objects::int32_dynamic_bitrate_display_rate,temp);
    } catch(std::exception const &) {return 9;}
    if (temp < 0) return 0;
    return (unsigned) temp;
}

dynamic_bitrate_helper::dynamic_bitrate_helper()
{
    reset();
}

void dynamic_bitrate_helper::init()
{
    if (!m_inited)
    {
        m_inited = true;
        unsigned temp = g_query_settings();
        if (temp > 0) {m_enabled = true; m_update_interval = 1.0 / (double) temp; }
        else {m_enabled = false; m_update_interval = 0; }
        m_last_duration = 0;
        m_update_bits = 0;
        m_update_time = 0;

    }
}

void dynamic_bitrate_helper::on_frame(double p_duration,t_size p_bits)
{
    init();
    m_last_duration = p_duration;
    m_update_time += p_duration;
    m_update_bits += p_bits;
}

bool dynamic_bitrate_helper::on_update(file_info & p_out, double & p_timestamp_delta)
{
    init();

    bool ret = false;
    if (m_enabled)
    {
        if (m_update_time > m_update_interval)
        {
            int val = (int) ( ((double)m_update_bits / m_update_time + 500.0) / 1000.0 );
            if (val != p_out.info_get_bitrate_vbr())
            {
                p_timestamp_delta = - (m_update_time - m_last_duration);    //relative to last frame beginning;
                p_out.info_set_bitrate_vbr(val);
                ret = true;
            }
            m_update_bits = 0;
            m_update_time = 0;
        }
    }
    else
    {
        m_update_bits = 0;
        m_update_time = 0;
    }

    return ret;

}

void dynamic_bitrate_helper::reset()
{
    m_inited = false;
}