Function roq_encode_frame

libavcodec/roqvideoenc.c:1054–1103

}

static int roq_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                            const AVFrame *frame, int *got_packet)
{
    RoqEncContext *const enc = avctx->priv_data;
    RoqContext    *const roq = &enc->common;
    int size, ret;

    enc->frame_to_enc = frame;

    if (frame->quality)
        enc->lambda = frame->quality - 1;
    else
        enc->lambda = 2*ROQ_LAMBDA_SCALE;

    /* 138 bits max per 8x8 block +
     *     256 codebooks*(6 bytes 2x2 + 4 bytes 4x4) + 8 bytes frame header */
    size = ((roq->width * roq->height / 64) * 138 + 7) / 8 + 256 * (6 + 4) + 8;
    if ((ret = ff_alloc_packet(avctx, pkt, size)) < 0)
        return ret;
    enc->out_buf = pkt->data;

    /* Check for I-frame */
    if (enc->framesSinceKeyframe == avctx->gop_size)
        enc->framesSinceKeyframe = 0;

    if (enc->first_frame) {
        /* Alloc memory for the reconstruction data (we must know the stride
         for that) */
        if ((ret = ff_encode_alloc_frame(avctx, roq->current_frame)) < 0 ||
            (ret = ff_encode_alloc_frame(avctx, roq->last_frame   )) < 0)
            return ret;

        /* Before the first video frame, write a "video info" chunk */
        roq_write_video_info_chunk(enc);

        enc->first_frame = 0;
    }

    /* Encode the actual frame */
    ret = roq_encode_video(enc);
    if (ret < 0)
        return ret;

    pkt->size   = enc->out_buf - pkt->data;
    if (enc->framesSinceKeyframe == 1)
        pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
}

#define OFFSET(x) offsetof(RoqEncContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM