Function flashsv_encode_frame

libavcodec/flashsvenc.c:207–253

static int flashsv_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                const AVFrame *pict, int *got_packet)
{
    FlashSVContext * const s = avctx->priv_data;
    const uint8_t *prev_frame = s->previous_frame;
    int res;
    int I_frame = 0;
    int opt_w = 4, opt_h = 4;

    /* First frame needs to be a keyframe */
    if (!s->previous_frame) {
        prev_frame = pict->data[0];
        I_frame = 1;
    }

    /* Check the placement of keyframes */
    if (avctx->gop_size > 0 &&
        avctx->frame_num >= s->last_key_frame + avctx->gop_size) {
        I_frame = 1;
    }

    res = ff_alloc_packet(avctx, pkt, s->packet_size);
    if (res < 0)
        return res;

    pkt->size = encode_bitstream(s, pict, pkt->data, pkt->size,
                                 opt_w * 16, opt_h * 16,
                                 prev_frame, &I_frame);

    //mark the frame type so the muxer can mux it correctly
    if (I_frame) {
        s->last_key_frame = avctx->frame_num;
        ff_dlog(avctx, "Inserting keyframe at frame %"PRId64"\n", avctx->frame_num);
    }

    if (I_frame)
        pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    //save the current frame
    res = av_buffer_replace(&s->prev_frame_buf, pict->buf[0]);
    if (res < 0)
        return res;
    s->previous_frame = pict->data[0];

    return 0;
}

const FFCodec ff_flashsv_encoder = {
    .p.name         = "flashsv",