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assrender: Add support for I420

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This commit is contained in:
Sebastian Dröge 2009-12-07 17:04:04 +01:00
parent d8fc5de450
commit 098f39a42a
1 changed files with 177 additions and 2 deletions
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179
ext/assrender/gstassrender.c
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@ -48,7 +48,8 @@ static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR ";"
GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR ";"
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx)
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx ";"
GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate video_sink_factory =
@ -57,7 +58,8 @@ static GstStaticPadTemplate video_sink_factory =
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR ";"
GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR ";"
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx)
GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx ";"
GST_VIDEO_CAPS_YUV ("I420"))
);
static GstStaticPadTemplate text_sink_factory =
@ -424,6 +426,176 @@ CREATE_RGB_BLIT_FUNCTION (bgrx, 4, 2, 1, 0);
#undef CREATE_RGB_BLIT_FUNCTION
#define COMP_Y(ret, r, g, b) \
{ \
ret = (int) (((19595 * r) >> 16) + ((38470 * g) >> 16) + ((7471 * b) >> 16)); \
ret = CLAMP (ret, 0, 255); \
}
#define COMP_U(ret, r, g, b) \
{ \
ret = (int) (-((11059 * r) >> 16) - ((21709 * g) >> 16) + ((32768 * b) >> 16) + 128); \
ret = CLAMP (ret, 0, 255); \
}
#define COMP_V(ret, r, g, b) \
{ \
ret = (int) (((32768 * r) >> 16) - ((27439 * g) >> 16) - ((5329 * b) >> 16) + 128); \
ret = CLAMP (ret, 0, 255); \
}
static void
blit_i420 (GstAssRender * render, ASS_Image * ass_image, GstBuffer * buffer)
{
guint counter = 0;
guint8 alpha, r, g, b, k;
guint8 Y, U, V;
const guint8 *src;
guint8 *dst;
gint x, y, w, h;
gint w2, h2;
gint width = render->width;
gint height = render->height;
gint src_stride;
gint y_offset, y_height, y_width, y_stride;
gint u_offset, u_height, u_width, u_stride;
gint v_offset, v_height, v_width, v_stride;
gint div;
y_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 0, width,
height);
u_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 1, width,
height);
v_offset =
gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, 2, width,
height);
y_height =
gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 0, height);
u_height =
gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 1, height);
v_height =
gst_video_format_get_component_height (GST_VIDEO_FORMAT_I420, 2, height);
y_width =
gst_video_format_get_component_width (GST_VIDEO_FORMAT_I420, 0, width);
u_width =
gst_video_format_get_component_width (GST_VIDEO_FORMAT_I420, 1, width);
v_width =
gst_video_format_get_component_width (GST_VIDEO_FORMAT_I420, 2, width);
y_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width);
u_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);
v_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 2, width);
while (ass_image) {
if (ass_image->dst_y > height || ass_image->dst_x > width)
goto next;
/* blend subtitles onto the video frame */
alpha = 255 - ((ass_image->color) & 0xff);
r = ((ass_image->color) >> 24) & 0xff;
g = ((ass_image->color) >> 16) & 0xff;
b = ((ass_image->color) >> 8) & 0xff;
COMP_Y (Y, r, g, b);
COMP_U (U, r, g, b);
COMP_V (V, r, g, b);
w = MIN (ass_image->w, width - ass_image->dst_x);
h = MIN (ass_image->h, height - ass_image->dst_y);
src_stride = ass_image->stride;
/* Y */
src = ass_image->bitmap;
dst =
buffer->data + y_offset + ass_image->dst_y * y_stride +
ass_image->dst_x;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
k = ((guint8) src[0]) * alpha / 255;
dst[0] = (k * Y + (255 - k) * dst[0]) / 255;
src++;
dst++;
}
src += src_stride - w;
dst += y_stride - w;
}
w2 = (w + 1) / 2;
h2 = (h + 1) / 2;
/* U */
src = ass_image->bitmap;
dst =
buffer->data + u_offset + ((ass_image->dst_y + 1) / 2) * u_stride +
(ass_image->dst_x + 1) / 2;
for (y = 0; y < h2; y++) {
for (x = 0; x < w2; x++) {
k = src[0] * alpha / 255;
div = 1;
if (x * 2 + 1 < w) {
k += src[1] * alpha / 255;
div++;
}
if (y * 2 + 1 < h) {
k += src[src_stride] * alpha / 255;
div++;
}
if (y * 2 + 1 < h && x * 2 + 1 < w) {
k += src[src_stride + 1] * alpha / 255;
div++;
}
k /= div;
dst[0] = (k * U + (255 - k) * dst[0]) / 255;
dst++;
src += 2;
}
dst += u_stride - w2;
src += src_stride - w2 * 2;
}
/* V */
src = ass_image->bitmap;
dst =
buffer->data + v_offset + ((ass_image->dst_y + 1) / 2) * v_stride +
(ass_image->dst_x + 1) / 2;
for (y = 0; y < h2; y++) {
for (x = 0; x < w2; x++) {
k = src[0] * alpha / 255;
div = 1;
if (x * 2 + 1 < w) {
k += src[1] * alpha / 255;
div++;
}
if (y * 2 + 1 < h) {
k += src[src_stride] * alpha / 255;
div++;
}
if (y * 2 + 1 < h && x * 2 + 1 < w) {
k += src[src_stride + 1] * alpha / 255;
div++;
}
k /= div;
dst[0] = (k * V + (255 - k) * dst[0]) / 255;
dst++;
src += 2;
}
dst += v_stride - w2;
src += src_stride - w2 * 2;
}
next:
counter++;
ass_image = ass_image->next;
}
GST_LOG_OBJECT (render, "amount of rendered ass_image: %u", counter);
}
static gboolean
gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
{
@ -467,6 +639,9 @@ gst_ass_render_setcaps_video (GstPad * pad, GstCaps * caps)
case GST_VIDEO_FORMAT_BGRx:
render->blit = blit_bgrx;
break;
case GST_VIDEO_FORMAT_I420:
render->blit = blit_i420;
break;
default:
ret = FALSE;
goto out;