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lavfi/vf_scale: convert to the frame-based sws API

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This commit is contained in:
Anton Khirnov 2021-07-07 15:00:19 +02:00
parent 42cd64c182
commit 22c6fbc847
1 changed files with 48 additions and 23 deletions
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71
libavfilter/vf_scale.c
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@ -619,29 +619,54 @@ static int request_frame_ref(AVFilterLink *outlink)
return ff_request_frame(outlink->src->inputs[1]);
}
static int scale_slice(ScaleContext *scale, AVFrame *out_buf, AVFrame *cur_pic, struct SwsContext *sws, int y, int h, int mul, int field)
static void frame_offset(AVFrame *frame, int dir, int is_pal)
{
const uint8_t *in[4];
uint8_t *out[4];
int in_stride[4],out_stride[4];
int i;
for (i=0; i<4; i++) {
int vsub= ((i+1)&2) ? scale->vsub : 0;
ptrdiff_t in_offset = ((y>>vsub)+field) * cur_pic->linesize[i];
ptrdiff_t out_offset = field * out_buf->linesize[i];
in_stride[i] = cur_pic->linesize[i] * mul;
out_stride[i] = out_buf->linesize[i] * mul;
in[i] = FF_PTR_ADD(cur_pic->data[i], in_offset);
out[i] = FF_PTR_ADD(out_buf->data[i], out_offset);
for (int i = 0; i < 4 && frame->data[i]; i++) {
if (i == 1 && is_pal)
break;
frame->data[i] += frame->linesize[i] * dir;
}
if (scale->input_is_pal)
in[1] = cur_pic->data[1];
if (scale->output_is_pal)
out[1] = out_buf->data[1];
}
return sws_scale(sws, in, in_stride, y/mul, h,
out,out_stride);
static int scale_field(ScaleContext *scale, AVFrame *dst, AVFrame *src,
int field)
{
int orig_h_src = src->height;
int orig_h_dst = dst->height;
int ret;
// offset the data pointers for the bottom field
if (field) {
frame_offset(src, 1, scale->input_is_pal);
frame_offset(dst, 1, scale->output_is_pal);
}
// take every second line
for (int i = 0; i < 4; i++) {
src->linesize[i] *= 2;
dst->linesize[i] *= 2;
}
src->height /= 2;
dst->height /= 2;
ret = sws_scale_frame(scale->isws[field], dst, src);
if (ret < 0)
return ret;
// undo the changes we made above
for (int i = 0; i < 4; i++) {
src->linesize[i] /= 2;
dst->linesize[i] /= 2;
}
src->height = orig_h_src;
dst->height = orig_h_dst;
if (field) {
frame_offset(src, -1, scale->input_is_pal);
frame_offset(dst, -1, scale->output_is_pal);
}
return 0;
}
static int scale_frame(AVFilterLink *link, AVFrame *in, AVFrame **frame_out)
@ -800,11 +825,11 @@ scale:
INT_MAX);
if (scale->interlaced>0 || (scale->interlaced<0 && in->interlaced_frame)) {
ret = scale_slice(scale, out, in, scale->isws[0], 0, (link->h+1)/2, 2, 0);
ret = scale_field(scale, out, in, 0);
if (ret >= 0)
ret = scale_slice(scale, out, in, scale->isws[1], 0, link->h /2, 2, 1);
ret = scale_field(scale, out, in, 1);
} else {
ret = scale_slice(scale, out, in, scale->sws, 0, link->h, 1, 0);
ret = sws_scale_frame(scale->sws, out, in);
}
av_frame_free(&in);