FFmpeg/libavcodec/rv10enc.c

/*
 * RV10 encoder
 * Copyright (c) 2000,2001 Fabrice Bellard
 * Copyright (c) 2002-2004 Michael Niedermayer
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * RV10 encoder
 */

#include "mpegvideo.h"
#include "put_bits.h"
#include "rv10.h"

int ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number)
{
    int full_frame= 0;

    avpriv_align_put_bits(&s->pb);

    put_bits(&s->pb, 1, 1);     /* marker */

    put_bits(&s->pb, 1, (s->pict_type == AV_PICTURE_TYPE_P));

    put_bits(&s->pb, 1, 0);     /* not PB frame */

    put_bits(&s->pb, 5, s->qscale);

    if (s->pict_type == AV_PICTURE_TYPE_I) {
        /* specific MPEG like DC coding not used */
    }
    /* if multiple packets per frame are sent, the position at which
       to display the macroblocks is coded here */
    if(!full_frame){
        if (s->mb_width * s->mb_height >= (1U << 12)) {
            avpriv_report_missing_feature(s->avctx, "Encoding frames with %d (>= 4096) macroblocks",
                                          s->mb_width * s->mb_height);
            return AVERROR(ENOSYS);
        }
        put_bits(&s->pb, 6, 0); /* mb_x */
        put_bits(&s->pb, 6, 0); /* mb_y */
        put_bits(&s->pb, 12, s->mb_width * s->mb_height);
    }

    put_bits(&s->pb, 3, 0);     /* ignored */
    return 0;
}

static const AVClass rv10_class = {
    .class_name = "rv10 encoder",
    .item_name  = av_default_item_name,
    .option     = ff_mpv_generic_options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_rv10_encoder = {
    .name           = "rv10",
    .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_RV10,
    .priv_data_size = sizeof(MpegEncContext),
    .init           = ff_mpv_encode_init,
    .encode2        = ff_mpv_encode_picture,
    .close          = ff_mpv_encode_end,
    .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
    .priv_class     = &rv10_class,
};