Function decode_init

libavcodec/exr.c:2327–2376

}

static av_cold int decode_init(AVCodecContext *avctx)
{
    EXRContext *s = avctx->priv_data;
#if FF_API_EXR_GAMMA
    uint32_t i;
    union av_intfloat32 t;
    float one_gamma = 1.0f / s->gamma;
    av_csp_trc_function trc_func = NULL;
#endif

    ff_init_float2half_tables(&s->f2h_tables);
    ff_init_half2float_tables(&s->h2f_tables);

    s->avctx              = avctx;

    ff_exrdsp_init(&s->dsp);

#if HAVE_BIGENDIAN
    ff_bswapdsp_init(&s->bbdsp);
#endif

#if FF_API_EXR_GAMMA
    trc_func = av_csp_trc_func_from_id(s->apply_trc_type);
    if (trc_func) {
        for (i = 0; i < 65536; ++i) {
            t.i = half2float(i, &s->h2f_tables);
            t.f = trc_func(t.f);
            s->gamma_table[i] = float2half(av_float2int(t.f), &s->f2h_tables);
        }
    } else if (one_gamma != 1.0f) {
        for (i = 0; i < 65536; ++i) {
            t.i = half2float(i, &s->h2f_tables);
            /* If negative value we reuse half value */
            if (t.f <= 0.0f) {
                s->gamma_table[i] = i;
            } else {
                t.f = powf(t.f, one_gamma);
                s->gamma_table[i] = float2half(t.i, &s->f2h_tables);
            }
        }
    }
#endif

    // allocate thread data, used for non EXR_RAW compression types
    s->thread_data = av_calloc(avctx->thread_count, sizeof(*s->thread_data));
    if (!s->thread_data)
        return AVERROR(ENOMEM);

    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{