Function smc_encode_frame

libavcodec/smcenc.c:531–581

}

static int smc_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                const AVFrame *frame, int *got_packet)
{
    SMCContext *s = avctx->priv_data;
    const AVFrame *pict = frame;
    PutByteContext pb;
    uint8_t *pal;
    int ret;

    ret = ff_alloc_packet(avctx, pkt, 8LL * avctx->height * avctx->width);
    if (ret < 0)
        return ret;

    if (avctx->gop_size == 0 || !s->prev_frame->data[0] ||
        (avctx->frame_num % avctx->gop_size) == 0) {
        s->key_frame = 1;
    } else {
        s->key_frame = 0;
    }

    bytestream2_init_writer(&pb, pkt->data, pkt->size);

    bytestream2_put_be32(&pb, 0x00);

    pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
    if (!pal)
        return AVERROR(ENOMEM);
    memcpy(pal, frame->data[1], AVPALETTE_SIZE);

    smc_encode_stream(s, pict, &pb);

    av_shrink_packet(pkt, bytestream2_tell_p(&pb));

    pkt->data[0] = 0x0;

    // write chunk length
    AV_WB24(pkt->data + 1, pkt->size);

    ret = av_frame_replace(s->prev_frame, frame);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "cannot add reference\n");
        return ret;
    }

    if (s->key_frame)
        pkt->flags |= AV_PKT_FLAG_KEY;

    *got_packet = 1;

    return 0;
}

static av_cold int smc_encode_end(AVCodecContext *avctx)
{