Function encode_init

libavcodec/asvenc.c:373–408

}

static av_cold int encode_init(AVCodecContext *avctx)
{
    ASVEncContext *const a = avctx->priv_data;
    int i;
    const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
    int inv_qscale;

    ff_asv_common_init(avctx);
    ff_fdctdsp_init(&a->fdsp, avctx);
    ff_pixblockdsp_init(&a->pdsp, 8);

    if (avctx->global_quality <= 0)
        avctx->global_quality = 4 * FF_QUALITY_SCALE;

    inv_qscale = (32 * scale * FF_QUALITY_SCALE +
                     avctx->global_quality / 2) / avctx->global_quality;

    avctx->extradata                   = av_mallocz(8);
    if (!avctx->extradata)
        return AVERROR(ENOMEM);
    avctx->extradata_size              = 8;
    AV_WL32A(avctx->extradata, inv_qscale);
    AV_WL32A(avctx->extradata + 4, MKTAG('A', 'S', 'U', 'S'));

    for (i = 0; i < 64; i++) {
        if (a->fdsp.fdct == ff_fdct_ifast) {
            int q = 32LL * scale * ff_mpeg1_default_intra_matrix[i] * ff_aanscales[i];
            a->q_intra_matrix[i] = (((int64_t)inv_qscale << 30) + q / 2) / q;
        } else {
            int q = 32 * scale * ff_mpeg1_default_intra_matrix[i];
            a->q_intra_matrix[i] = ((inv_qscale << 16) + q / 2) / q;
        }
    }

    return 0;
}

#if CONFIG_ASV1_ENCODER
const FFCodec ff_asv1_encoder = {