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