static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
PixdescTestContext *priv = inlink->dst->priv;
AVFilterBufferRef *inpic = inlink->cur_buf;
AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
int i, c, w = inlink->w;
for (c = 0; c < priv->pix_desc->nb_components; c++) {
int w1 = c == 1 || c == 2 ? w>>priv->pix_desc->log2_chroma_w : w;
int h1 = c == 1 || c == 2 ? h>>priv->pix_desc->log2_chroma_h : h;
int y1 = c == 1 || c == 2 ? y>>priv->pix_desc->log2_chroma_h : y;
for (i = y1; i < y1 + h1; i++) {
av_read_image_line(priv->line,
inpic->data,
inpic->linesize,
priv->pix_desc,
0, i, c, w1, 0);
av_write_image_line(priv->line,
outpic->data,
outpic->linesize,
priv->pix_desc,
0, i, c, w1);
}
}
return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
PixdescTestContext *priv = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *out;
int i, c, w = inlink->w, h = inlink->h;
const int cw = FF_CEIL_RSHIFT(w, priv->pix_desc->log2_chroma_w);
const int ch = FF_CEIL_RSHIFT(h, priv->pix_desc->log2_chroma_h);
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
for (i = 0; i < 4; i++) {
const int h1 = i == 1 || i == 2 ? ch : h;
if (out->data[i]) {
uint8_t *data = out->data[i] +
(out->linesize[i] > 0 ? 0 : out->linesize[i] * (h1-1));
memset(data, 0, FFABS(out->linesize[i]) * h1);
}
}
/* copy palette */
if (priv->pix_desc->flags & AV_PIX_FMT_FLAG_PAL ||
priv->pix_desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
for (c = 0; c < priv->pix_desc->nb_components; c++) {
const int w1 = c == 1 || c == 2 ? cw : w;
const int h1 = c == 1 || c == 2 ? ch : h;
for (i = 0; i < h1; i++) {
av_read_image_line(priv->line,
(void*)in->data,
in->linesize,
priv->pix_desc,
0, i, c, w1, 0);
av_write_image_line(priv->line,
out->data,
out->linesize,
priv->pix_desc,
0, i, c, w1);
}
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
