+static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
+ const AVFrame *frame)
+{
+ LJpegEncContext *s = avctx->priv_data;
+ const int width = frame->width;
+ const int height = frame->height;
+ const int linesize = frame->linesize[0];
+ uint16_t (*buffer)[4] = s->scratch;
+ const int predictor = avctx->prediction_method+1;
+ int left[3], top[3], topleft[3];
+ int x, y, i;
+
+ for (i = 0; i < 3; i++)
+ buffer[0][i] = 1 << (9 - 1);
+
+ for (y = 0; y < height; y++) {
+ const int modified_predictor = y ? predictor : 1;
+ uint8_t *ptr = frame->data[0] + (linesize * y);
+
+ if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 3) {
+ av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
+ return -1;
+ }
+
+ for (i = 0; i < 3; i++)
+ top[i]= left[i]= topleft[i]= buffer[0][i];
+
+ for (x = 0; x < width; x++) {
+ buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
+ buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
+ buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
+
+ for (i = 0; i < 3; i++) {
+ int pred, diff;
+
+ PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
+
+ topleft[i] = top[i];
+ top[i] = buffer[x+1][i];
+
+ left[i] = buffer[x][i];
+
+ diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
+
+ if (i == 0)
+ ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
+ else
+ ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
+ }
+ }
+ }
+
+ return 0;
+}
+