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dvbsuboverlay: Implement nearest neighbour scaling for the subpictures

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This becomes necessary when SDTV subtitles are used for HDTV videos.
This commit is contained in:
Sebastian Dröge 2010-12-07 17:17:44 +01:00 committed by Edward Hervey
parent de85aef333
commit 04eb581480
1 changed files with 54 additions and 27 deletions
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81
gst/dvbsuboverlay/gstdvbsuboverlay.c
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@ -478,7 +478,7 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
gint u1, u2, u3, u4; gint u1, u2, u3, u4;
gint v1, v2, v3, v4; gint v1, v2, v3, v4;
guint32 color; guint32 color;
const guint8 *src, *src2; const guint8 *src;
guint8 *dst_y, *dst_y2, *dst_u, *dst_v; guint8 *dst_y, *dst_y2, *dst_u, *dst_v;
gint x, y, w, h; gint x, y, w, h;
gint w2, h2; gint w2, h2;
@ -518,6 +518,10 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
v_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 2, width); v_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 2, width);
for (counter = 0; counter < subs->num_rects; counter++) { for (counter = 0; counter < subs->num_rects; counter++) {
gint dw, dh;
gint32 sx, sy; /* 16.16 fixed point */
gint32 xstep, ystep; /* 16.16 fixed point */
sub_region = subs->rects[counter]; sub_region = subs->rects[counter];
if (sub_region->y > height || sub_region->x > width) if (sub_region->y > height || sub_region->x > width)
continue; continue;
@ -526,13 +530,22 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
w = MIN (sub_region->w, width - sub_region->x); w = MIN (sub_region->w, width - sub_region->x);
h = MIN (sub_region->h, height - sub_region->y); h = MIN (sub_region->h, height - sub_region->y);
w2 = (w + 1) / 2; /* TODO
h2 = (h + 1) / 2; dw = MIN (sub_region->dw, width - sub_region->x);
dh = MIN (sub_region->dh, height - sub_region->y);
*/
dw = w;
dh = h;
xstep = (w << 16) / dw;
ystep = (h << 16) / dh;
w2 = (dw + 1) / 2;
h2 = (dh + 1) / 2;
src_stride = sub_region->pict.rowstride; src_stride = sub_region->pict.rowstride;
src = sub_region->pict.data; src = sub_region->pict.data;
src2 = sub_region->pict.data + src_stride;
dst_y = buffer->data + y_offset + sub_region->y * y_stride + sub_region->x; dst_y = buffer->data + y_offset + sub_region->y * y_stride + sub_region->x;
dst_y2 = dst_y2 =
buffer->data + y_offset + (sub_region->y + 1) * y_stride + buffer->data + y_offset + (sub_region->y + 1) * y_stride +
@ -544,9 +557,12 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
buffer->data + v_offset + ((sub_region->y + 1) / 2) * v_stride + buffer->data + v_offset + ((sub_region->y + 1) / 2) * v_stride +
(sub_region->x + 1) / 2; (sub_region->x + 1) / 2;
for (y = 0; y < h - 1; y += 2) { sy = 0;
for (x = 0; x < w - 1; x += 2) { for (y = 0; y < dh - 1; y += 2) {
color = sub_region->pict.palette[src[0]]; sx = 0;
for (x = 0; x < dw - 1; x += 2) {
color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff; a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -556,7 +572,9 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
u1 = rgb_to_u (r, g, b); u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b); v1 = rgb_to_v (r, g, b);
color = sub_region->pict.palette[src[1]]; color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + ((sx +
xstep) >> 16)]];
a2 = (color >> 24) & 0xff; a2 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -566,7 +584,9 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
u2 = rgb_to_u (r, g, b); u2 = rgb_to_u (r, g, b);
v2 = rgb_to_v (r, g, b); v2 = rgb_to_v (r, g, b);
color = sub_region->pict.palette[src2[0]]; color =
sub_region->pict.palette[src[((sy + ystep) >> 16) * src_stride +
(sx >> 16)]];
a3 = (color >> 24) & 0xff; a3 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -576,7 +596,9 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
u3 = rgb_to_u (r, g, b); u3 = rgb_to_u (r, g, b);
v3 = rgb_to_v (r, g, b); v3 = rgb_to_v (r, g, b);
color = sub_region->pict.palette[src2[1]]; color =
sub_region->pict.palette[src[((sy + ystep) >> 16) * src_stride +
((sx + xstep) >> 16)]];
a4 = (color >> 24) & 0xff; a4 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -597,17 +619,17 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
dst_v[0] = dst_v[0] =
(a1 * ((v1 + v2 + v3 + v4) / 4) + (255 - a1) * dst_v[0]) / 255; (a1 * ((v1 + v2 + v3 + v4) / 4) + (255 - a1) * dst_v[0]) / 255;
src += 2;
src2 += 2;
dst_y += 2; dst_y += 2;
dst_y2 += 2; dst_y2 += 2;
dst_u += 1; dst_u += 1;
dst_v += 1; dst_v += 1;
sx += 2 * xstep;
} }
/* Odd width */ /* Odd width */
if (x < w) { if (x < dw) {
color = sub_region->pict.palette[src[0]]; color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff; a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -617,7 +639,9 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
u1 = rgb_to_u (r, g, b); u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b); v1 = rgb_to_v (r, g, b);
color = sub_region->pict.palette[src2[0]]; color =
sub_region->pict.palette[src[((sy + ystep) >> 16) * src_stride +
(sx >> 16)]];
a3 = (color >> 24) & 0xff; a3 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -634,16 +658,15 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
dst_u[0] = (a1 * ((u1 + u3) / 2) + (255 - a1) * dst_u[0]) / 255; dst_u[0] = (a1 * ((u1 + u3) / 2) + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * ((v1 + v3) / 2) + (255 - a1) * dst_v[0]) / 255; dst_v[0] = (a1 * ((v1 + v3) / 2) + (255 - a1) * dst_v[0]) / 255;
src += 1;
src2 += 1;
dst_y += 1; dst_y += 1;
dst_y2 += 1; dst_y2 += 1;
dst_u += 1; dst_u += 1;
dst_v += 1; dst_v += 1;
sx += xstep;
} }
src += src_stride + (src_stride - w); sy += 2 * ystep;
src2 += src_stride + (src_stride - w);
dst_y += y_stride + (y_stride - w); dst_y += y_stride + (y_stride - w);
dst_y2 += y_stride + (y_stride - w); dst_y2 += y_stride + (y_stride - w);
dst_u += u_stride - w2; dst_u += u_stride - w2;
@ -651,9 +674,10 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
} }
/* Odd height */ /* Odd height */
if (y < h) { if (y < dh) {
for (x = 0; x < w - 1; x += 2) { for (x = 0; x < dw - 1; x += 2) {
color = sub_region->pict.palette[src[0]]; color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff; a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -663,7 +687,9 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
u1 = rgb_to_u (r, g, b); u1 = rgb_to_u (r, g, b);
v1 = rgb_to_v (r, g, b); v1 = rgb_to_v (r, g, b);
color = sub_region->pict.palette[src[1]]; color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + ((sx +
xstep) >> 16)]];
a2 = (color >> 24) & 0xff; a2 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -680,15 +706,16 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
dst_u[0] = (a1 * ((u1 + u2) / 2) + (255 - a1) * dst_u[0]) / 255; dst_u[0] = (a1 * ((u1 + u2) / 2) + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * ((v1 + v2) / 2) + (255 - a1) * dst_v[0]) / 255; dst_v[0] = (a1 * ((v1 + v2) / 2) + (255 - a1) * dst_v[0]) / 255;
src += 2;
dst_y += 2; dst_y += 2;
dst_u += 1; dst_u += 1;
dst_v += 1; dst_v += 1;
sx += 2 * xstep;
} }
/* Odd height and width */ /* Odd height and width */
if (x < w) { if (x < dw) {
color = sub_region->pict.palette[src[0]]; color =
sub_region->pict.palette[src[(sy >> 16) * src_stride + (sx >> 16)]];
a1 = (color >> 24) & 0xff; a1 = (color >> 24) & 0xff;
r = (color >> 16) & 0xff; r = (color >> 16) & 0xff;
g = (color >> 8) & 0xff; g = (color >> 8) & 0xff;
@ -703,10 +730,10 @@ blit_i420 (GstDVBSubOverlay * overlay, DVBSubtitles * subs, GstBuffer * buffer)
dst_u[0] = (a1 * u1 + (255 - a1) * dst_u[0]) / 255; dst_u[0] = (a1 * u1 + (255 - a1) * dst_u[0]) / 255;
dst_v[0] = (a1 * v1 + (255 - a1) * dst_v[0]) / 255; dst_v[0] = (a1 * v1 + (255 - a1) * dst_v[0]) / 255;
src += 1;
dst_y += 1; dst_y += 1;
dst_u += 1; dst_u += 1;
dst_v += 1; dst_v += 1;
sx += xstep;
} }
} }
} }