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/* Cesar project {{{
 *
 * Copyright (C) 2009 Spidcom
 *
 * <<<Licence>>>
 *
 * }}} */
/**
 * \file    mac/common/src/interval.c
 * \brief   Functions to handle intervals
 * \ingroup mac_common
 */
#include "common/std.h"
#include "lib/utils.h"
#include "mac/common/timings.h"
#include "mac/common/interval.h"

u8 mac_interval_fsm_count_ = 6;
u8 mac_interval_repetition_count_ = 4;
u16 mac_interval_measure_shift_tolerance_ = MAC_TCK_TO_ATU (
    MAC_TM_TOLERANCE_TCK);

void
mac_interval_clear (tonemaps_t *tms)
{
    /* Check parameters. */
    dbg_assert (tms);
    dbg_assert (tms->intervals_temp);

    tms->intervals_temp->intervals_nb = 0;
}

u8
mac_interval_append (tonemaps_t *tms, u16 end_offset_atu, u8 tmi)
{
    /* Check parameters. */
    dbg_assert (tms);
    dbg_assert (tms->intervals_temp);
    dbg_assert (end_offset_atu);

    /* Get intervals. */
    tonemap_intervals_t *ti = tms->intervals_temp;
    dbg_assert (ti);
    /* Maximum of supported intervals is 32. */
    if (ti->intervals_nb >= TONEMAP_INTERVAL_NB)
        return 0;
    /* Must be lower than the last one if it exists. */
    if (ti->intervals_nb &&
        ti->interval[ti->intervals_nb - 1].end_offset_atu >= end_offset_atu)
        return 0;

    /* Append intervals. */
    ti->interval[ti->intervals_nb].end_offset_atu = end_offset_atu;
    ti->interval[ti->intervals_nb].tmi = tmi;

    return ++ti->intervals_nb;
}

void
mac_interval_commit_changes (tonemaps_t *tms)
{
    /* Check parameters. */
    dbg_assert (tms);
    dbg_assert (tms->intervals_temp);
    dbg_assert (tms->intervals);

    /* Update intervals version before switching intervals. */
    tms->intervals_temp->version = tms->intervals->version + 1;
    /* Atomic switch of intervals list. */
    XCH (tms->intervals, tms->intervals_temp);
    /* Reset temporary intervals list. */
    tms->intervals_temp->intervals_nb = 0;
}