Function avcodec_dct_init

libavcodec/avdct.c:90–132

}

av_cold int avcodec_dct_init(AVDCT *dsp)
{
    AVCodecContext *avctx = avcodec_alloc_context3(NULL);

    if (!avctx)
        return AVERROR(ENOMEM);

    avctx->idct_algo = dsp->idct_algo;
    avctx->dct_algo  = dsp->dct_algo;
    avctx->bits_per_raw_sample = dsp->bits_per_sample;

#define COPY(src, name) memcpy(&dsp->name, &src.name, sizeof(dsp->name))

#if CONFIG_IDCTDSP
    {
        IDCTDSPContext idsp = {0};
        ff_idctdsp_init(&idsp, avctx);
        COPY(idsp, idct);
        COPY(idsp, idct_permutation);
    }
#endif

#if CONFIG_FDCTDSP
    {
        FDCTDSPContext fdsp;
        ff_fdctdsp_init(&fdsp, avctx);
        COPY(fdsp, fdct);
    }
#endif

#if CONFIG_PIXBLOCKDSP
    {
        PixblockDSPContext pdsp;
        ff_pixblockdsp_init(&pdsp, dsp->bits_per_sample);
        COPY(pdsp, get_pixels);
        COPY(pdsp, get_pixels_unaligned);
    }
#endif

    avcodec_free_context(&avctx);

    return 0;
}