xtc/src/mixer/model.c

#include "../project/project_internal.h"
#include <math.h>
#include <string.h>

static size_t find_track(const xtc_project *p, uint64_t id)
{
    size_t i;
    for (i = 0; i < p->track_count; ++i)
        if (p->tracks[i].id == id)
            return i;
    return SIZE_MAX;
}

xtc_result xtc_project_set_mix(xtc_project *p, uint64_t id, float gain, float pan, int mute, int solo)
{
    size_t i;
    if (!p || !isfinite(gain) || gain < 0 || gain > 4 || !isfinite(pan) || pan < -1 || pan > 1 ||
        (mute != 0 && mute != 1) || (solo != 0 && solo != 1))
        return XTC_ERR_INVALID_ARGUMENT;
    i = find_track(p, id);
    if (i == SIZE_MAX)
        return XTC_ERR_NOT_FOUND;
    p->tracks[i].gain = gain;
    p->tracks[i].pan = pan;
    p->tracks[i].mute = mute;
    p->tracks[i].solo = solo;
    return XTC_OK;
}

xtc_result xtc_project_set_automation(xtc_project *p, const xtc_automation_point *a)
{
    size_t i;
    if (!p || !a || !isfinite(a->value) || a->tick > XTC_PROJECT_MAX_TICK ||
        (a->parameter != XTC_AUTOMATION_GAIN && a->parameter != XTC_AUTOMATION_PAN) ||
        a->value < (a->parameter == XTC_AUTOMATION_GAIN ? 0 : -1) ||
        a->value > (a->parameter == XTC_AUTOMATION_GAIN ? 4 : 1))
        return XTC_ERR_INVALID_ARGUMENT;
    if (find_track(p, a->track_id) == SIZE_MAX)
        return XTC_ERR_NOT_FOUND;
    for (i = 0; i < p->automation_count; ++i)
        if (p->automation[i].track_id == a->track_id && p->automation[i].parameter == a->parameter &&
            p->automation[i].tick == a->tick)
            break;
    if (i == XTC_MAX_AUTOMATION_POINTS)
        return XTC_ERR_CAPACITY;
    if (i == p->automation_count)
        ++p->automation_count;
    p->automation[i] = *a;
    return XTC_OK;
}

xtc_result xtc_project_remove_automation(xtc_project *p, uint64_t id, xtc_automation_parameter param, uint64_t tick)
{
    size_t i;
    if (!p || (param != XTC_AUTOMATION_GAIN && param != XTC_AUTOMATION_PAN) || tick > XTC_PROJECT_MAX_TICK)
        return XTC_ERR_INVALID_ARGUMENT;
    for (i = 0; i < p->automation_count; ++i)
        if (p->automation[i].track_id == id && p->automation[i].parameter == param && p->automation[i].tick == tick)
            break;
    if (i == p->automation_count)
        return XTC_ERR_NOT_FOUND;
    memmove(p->automation + i, p->automation + i + 1, (--p->automation_count - i) * sizeof(*p->automation));
    return XTC_OK;
}

xtc_result xtc_project_automation_count(const xtc_project *p, size_t *n)
{
    if (!p || !n)
        return XTC_ERR_INVALID_ARGUMENT;
    *n = p->automation_count;
    return XTC_OK;
}

xtc_result xtc_project_get_automation(const xtc_project *p, size_t i, xtc_automation_point *a)
{
    if (!p || !a)
        return XTC_ERR_INVALID_ARGUMENT;
    if (i >= p->automation_count)
        return XTC_ERR_NOT_FOUND;
    *a = p->automation[i];
    return XTC_OK;
}