gstreamer/subprojects/gst-plugins-bad/gst/dvdspu/gstspu-vobsub-render.c

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/* GStreamer DVD Sub-Picture Unit
* Copyright (C) 2007 Fluendo S.A. <info@fluendo.com>
* Copyright (C) 2009 Jan Schmidt <thaytan@noraisin.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <string.h>
#include <gst/gst.h>
#include "gstdvdspu.h"
GST_DEBUG_CATEGORY_EXTERN (dvdspu_debug);
#define GST_CAT_DEFAULT dvdspu_debug
static void
gstspu_vobsub_recalc_palette (GstDVDSpu * dvdspu,
SpuColour * dest, guint8 * idx, guint8 * alpha)
{
SpuState *state = &dvdspu->spu_state;
gint i;
if (state->vobsub.current_clut[idx[0]] != 0) {
for (i = 0; i < 4; i++, dest++) {
guint32 col = state->vobsub.current_clut[idx[i]];
gint A, Y, U, V;
gint R, G, B;
/* Convert incoming 4-bit alpha to 8 bit for blending */
A = (alpha[i] << 4) | alpha[i];
Y = ((col >> 16) & 0xff);
/* U/V are stored as V/U in the clut words, so switch them */
V = ((col >> 8) & 0xff);
U = (col & 0xff);
R = (298 * Y + 459 * V - 63514) >> 8;
G = (298 * Y - 55 * U - 136 * V + 19681) >> 8;
B = (298 * Y + 541 * U - 73988) >> 8;
R = CLAMP (R, 0, 255);
G = CLAMP (G, 0, 255);
B = CLAMP (B, 0, 255);
dest->A = A;
dest->R = R * A / 255;
dest->G = G * A / 255;
dest->B = B * A / 255;
}
} else {
int c = 255;
/* The CLUT presumably hasn't been set, so we'll just guess some
* values for the non-transparent colors (white, grey, black) */
for (i = 0; i < 4; i++, dest++) {
dest->A = (alpha[i] << 4) | alpha[i];
if (alpha[i] != 0) {
dest->R = dest->G = dest->B = c * dest->A / 255;
c -= 128;
if (c < 0)
c = 0;
}
}
}
}
/* Recalculate the main, HL & ChgCol palettes */
static void
gstspu_vobsub_update_palettes (GstDVDSpu * dvdspu, SpuState * state)
{
guint8 index[4]; /* Indices for the palette */
guint8 alpha[4]; /* Alpha values the palette */
if (state->vobsub.main_pal_dirty) {
gstspu_vobsub_recalc_palette (dvdspu, state->vobsub.main_pal,
state->vobsub.main_idx, state->vobsub.main_alpha);
/* Need to refresh the hl_ctrl info copies of the main palette too */
memcpy (state->vobsub.hl_ctrl_i.pix_ctrl_i[0].pal_cache,
state->vobsub.main_pal, 4 * sizeof (SpuColour));
memcpy (state->vobsub.hl_ctrl_i.pix_ctrl_i[2].pal_cache,
state->vobsub.main_pal, 4 * sizeof (SpuColour));
state->vobsub.main_pal_dirty = FALSE;
}
if (state->vobsub.hl_pal_dirty) {
gstspu_vobsub_recalc_palette (dvdspu,
state->vobsub.hl_ctrl_i.pix_ctrl_i[1].pal_cache, state->vobsub.hl_idx,
state->vobsub.hl_alpha);
state->vobsub.hl_pal_dirty = FALSE;
}
/* Update the offset positions for the highlight region */
if (state->vobsub.hl_rect.top != -1) {
state->vobsub.hl_ctrl_i.top = state->vobsub.hl_rect.top;
state->vobsub.hl_ctrl_i.bottom = state->vobsub.hl_rect.bottom;
state->vobsub.hl_ctrl_i.n_changes = 3;
state->vobsub.hl_ctrl_i.pix_ctrl_i[0].left = 0;
state->vobsub.hl_ctrl_i.pix_ctrl_i[1].left = state->vobsub.hl_rect.left;
state->vobsub.hl_ctrl_i.pix_ctrl_i[2].left =
state->vobsub.hl_rect.right + 1;
}
if (state->vobsub.line_ctrl_i_pal_dirty) {
gint16 l, c;
GST_LOG_OBJECT (dvdspu, "Updating chg-col-con palettes");
for (l = 0; l < state->vobsub.n_line_ctrl_i; l++) {
SpuVobsubLineCtrlI *cur_line_ctrl = state->vobsub.line_ctrl_i + l;
for (c = 0; c < cur_line_ctrl->n_changes; c++) {
SpuVobsubPixCtrlI *cur = cur_line_ctrl->pix_ctrl_i + c;
index[3] = (cur->palette >> 28) & 0x0f;
index[2] = (cur->palette >> 24) & 0x0f;
index[1] = (cur->palette >> 20) & 0x0f;
index[0] = (cur->palette >> 16) & 0x0f;
alpha[3] = (cur->palette >> 12) & 0x0f;
alpha[2] = (cur->palette >> 8) & 0x0f;
alpha[1] = (cur->palette >> 4) & 0x0f;
alpha[0] = (cur->palette) & 0x0f;
gstspu_vobsub_recalc_palette (dvdspu, cur->pal_cache, index, alpha);
}
}
state->vobsub.line_ctrl_i_pal_dirty = FALSE;
}
}
static inline guint8
gstspu_vobsub_get_nibble (SpuState * state, guint16 * rle_offset)
{
guint8 ret;
if (G_UNLIKELY (*rle_offset >= state->vobsub.max_offset))
return 0; /* Overran the buffer */
ret = state->vobsub.pix_buf_map.data[(*rle_offset) / 2];
/* If the offset is even, we shift the answer down 4 bits, otherwise not */
if (*rle_offset & 0x01)
ret &= 0x0f;
else
ret = ret >> 4;
(*rle_offset)++;
return ret;
}
static guint16
gstspu_vobsub_get_rle_code (SpuState * state, guint16 * rle_offset)
{
guint16 code;
code = gstspu_vobsub_get_nibble (state, rle_offset);
if (code < 0x4) { /* 4 .. f */
code = (code << 4) | gstspu_vobsub_get_nibble (state, rle_offset);
if (code < 0x10) { /* 1x .. 3x */
code = (code << 4) | gstspu_vobsub_get_nibble (state, rle_offset);
if (code < 0x40) { /* 04x .. 0fx */
code = (code << 4) | gstspu_vobsub_get_nibble (state, rle_offset);
}
}
}
return code;
}
static inline gboolean
gstspu_vobsub_draw_rle_run (SpuState * state, GstVideoFrame * frame,
gint16 x, gint16 end, SpuColour * colour)
{
GST_TRACE ("Y: %d x: %d end %d %d %d %d %d",
state->vobsub.cur_Y, x, end, colour->R, colour->G, colour->B, colour->A);
if (colour->A > 0) {
gint i;
guint8 *data;
guint8 inv_A = 255 - colour->A;
data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
data += GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0) *
(state->vobsub.cur_Y - state->vobsub.disp_rect.top);
x -= state->vobsub.disp_rect.left;
end -= state->vobsub.disp_rect.left;
for (i = x; i < end; i++) {
SpuColour *pix = &((SpuColour *) data)[x++];
if (pix->A == 0) {
memcpy (pix, colour, sizeof (*pix));
} else {
pix->A = colour->A;
pix->R = colour->R + pix->R * inv_A / 255;
pix->G = colour->G + pix->G * inv_A / 255;
pix->B = colour->B + pix->B * inv_A / 255;
}
}
return TRUE;
}
return FALSE;
}
static inline gint16
rle_end_x (guint16 rle_code, gint16 x, gint16 end)
{
/* run length = rle_code >> 2 */
if (G_UNLIKELY (((rle_code >> 2) == 0)))
return end;
else
return MIN (end, x + (rle_code >> 2));
}
static gboolean gstspu_vobsub_render_line_with_chgcol (SpuState * state,
GstVideoFrame * frame, guint16 * rle_offset);
static gboolean gstspu_vobsub_update_chgcol (SpuState * state);
static gboolean
gstspu_vobsub_render_line (SpuState * state, GstVideoFrame * frame,
guint16 * rle_offset)
{
gint16 x, next_x, end, rle_code, next_draw_x;
SpuColour *colour;
gboolean visible = FALSE;
/* Check for special case of chg_col info to use (either highlight or
* ChgCol command */
if (state->vobsub.cur_chg_col != NULL) {
if (gstspu_vobsub_update_chgcol (state)) {
/* Check the top & bottom, because we might not be within the region yet */
if (state->vobsub.cur_Y >= state->vobsub.cur_chg_col->top &&
state->vobsub.cur_Y <= state->vobsub.cur_chg_col->bottom) {
return gstspu_vobsub_render_line_with_chgcol (state, frame, rle_offset);
}
}
}
/* No special case. Render as normal */
/* We always need to start our RLE decoding byte_aligned */
*rle_offset = GST_ROUND_UP_2 (*rle_offset);
x = state->vobsub.disp_rect.left;
end = state->vobsub.disp_rect.right + 1;
while (x < end) {
rle_code = gstspu_vobsub_get_rle_code (state, rle_offset);
colour = &state->vobsub.main_pal[rle_code & 3];
next_x = rle_end_x (rle_code, x, end);
next_draw_x = next_x;
if (next_draw_x > state->vobsub.disp_rect.right)
next_draw_x = state->vobsub.disp_rect.right; /* ensure no overflow */
/* Now draw the run between [x,next_x) */
visible |=
gstspu_vobsub_draw_rle_run (state, frame, x, next_draw_x, colour);
x = next_x;
}
return visible;
}
static gboolean
gstspu_vobsub_update_chgcol (SpuState * state)
{
if (state->vobsub.cur_chg_col == NULL)
return FALSE;
if (state->vobsub.cur_Y <= state->vobsub.cur_chg_col->bottom)
return TRUE;
while (state->vobsub.cur_chg_col < state->vobsub.cur_chg_col_end) {
if (state->vobsub.cur_Y >= state->vobsub.cur_chg_col->top &&
state->vobsub.cur_Y <= state->vobsub.cur_chg_col->bottom) {
#if 0
g_print ("Stopped @ entry %d with top %d bottom %d, cur_y %d",
(gint16) (state->vobsub.cur_chg_col - state->vobsub.line_ctrl_i),
state->vobsub.cur_chg_col->top, state->vobsub.cur_chg_col->bottom, y);
#endif
return TRUE;
}
state->vobsub.cur_chg_col++;
}
/* Finished all our cur_chg_col entries. Use the main palette from here on */
state->vobsub.cur_chg_col = NULL;
return FALSE;
}
static gboolean
gstspu_vobsub_render_line_with_chgcol (SpuState * state, GstVideoFrame * frame,
guint16 * rle_offset)
{
SpuVobsubLineCtrlI *chg_col = state->vobsub.cur_chg_col;
gint16 x, next_x, disp_end, rle_code, run_end, run_draw_end;
SpuColour *colour;
SpuVobsubPixCtrlI *cur_pix_ctrl;
SpuVobsubPixCtrlI *next_pix_ctrl;
SpuVobsubPixCtrlI *end_pix_ctrl;
SpuVobsubPixCtrlI dummy_pix_ctrl;
gboolean visible = FALSE;
gint16 cur_reg_end;
gint i;
/* We always need to start our RLE decoding byte_aligned */
*rle_offset = GST_ROUND_UP_2 (*rle_offset);
/* Our run will cover the display rect */
x = state->vobsub.disp_rect.left;
disp_end = state->vobsub.disp_rect.right + 1;
/* Work out the first pixel control info, which may point to the dummy entry if
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* the global palette/alpha need using initially */
cur_pix_ctrl = chg_col->pix_ctrl_i;
end_pix_ctrl = chg_col->pix_ctrl_i + chg_col->n_changes;
if (cur_pix_ctrl->left != 0) {
next_pix_ctrl = cur_pix_ctrl;
cur_pix_ctrl = &dummy_pix_ctrl;
for (i = 0; i < 4; i++) /* Copy the main palette to our dummy entry */
dummy_pix_ctrl.pal_cache[i] = state->vobsub.main_pal[i];
} else {
next_pix_ctrl = cur_pix_ctrl + 1;
}
if (next_pix_ctrl < end_pix_ctrl)
cur_reg_end = next_pix_ctrl->left;
else
cur_reg_end = disp_end;
/* Render stuff */
while (x < disp_end) {
rle_code = gstspu_vobsub_get_rle_code (state, rle_offset);
next_x = rle_end_x (rle_code, x, disp_end);
/* Now draw the run between [x,next_x), crossing palette regions as needed */
while (x < next_x) {
run_end = MIN (next_x, cur_reg_end);
run_draw_end = run_end;
if (run_draw_end > state->vobsub.disp_rect.right)
run_draw_end = state->vobsub.disp_rect.right; /* ensure no overflow */
if (G_LIKELY (x < run_end)) {
colour = &cur_pix_ctrl->pal_cache[rle_code & 3];
visible |= gstspu_vobsub_draw_rle_run (state, frame, x,
run_draw_end, colour);
x = run_end;
}
if (x >= cur_reg_end) {
/* Advance to next region */
cur_pix_ctrl = next_pix_ctrl;
next_pix_ctrl++;
if (next_pix_ctrl < end_pix_ctrl)
cur_reg_end = next_pix_ctrl->left;
else
cur_reg_end = disp_end;
}
}
}
return visible;
}
static void
gstspu_vobsub_draw_highlight (SpuState * state,
GstVideoFrame * frame, SpuRect * rect)
{
SpuColour *cur;
SpuRect r;
guint8 *data;
guint stride;
gint16 pos;
r.left = rect->left - state->vobsub.disp_rect.left;
r.right = rect->right - state->vobsub.disp_rect.left;
r.top = rect->top - state->vobsub.disp_rect.top;
r.bottom = rect->bottom - state->vobsub.disp_rect.top;
rect = &r;
data = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
stride = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0);
cur = (SpuColour *) (data + stride * rect->top);
for (pos = rect->left; pos < rect->right; pos++)
cur[pos].A = 0x80;
cur = (SpuColour *) (data + stride * (rect->bottom - 1));
for (pos = rect->left; pos < rect->right; pos++)
cur[pos].A = 0x80;
for (pos = rect->top; pos < rect->bottom; pos++) {
cur = (SpuColour *) (data + stride * pos);
cur[rect->left].A = 0x80;
cur[rect->right - 1].A = 0x80;
}
}
void
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gstspu_vobsub_render (GstDVDSpu * dvdspu, GstVideoFrame * frame)
{
SpuState *state = &dvdspu->spu_state;
gint y, last_y;
guint16 cur_offsets[2];
/* Set up our initial state */
if (G_UNLIKELY (state->vobsub.pix_buf == NULL))
return;
if (!gst_buffer_map (state->vobsub.pix_buf, &state->vobsub.pix_buf_map,
GST_MAP_READ))
return;
GST_DEBUG_OBJECT (dvdspu,
"Rendering SPU. disp_rect %d,%d to %d,%d. hl_rect %d,%d to %d,%d",
state->vobsub.disp_rect.left, state->vobsub.disp_rect.top,
state->vobsub.disp_rect.right, state->vobsub.disp_rect.bottom,
state->vobsub.hl_rect.left, state->vobsub.hl_rect.top,
state->vobsub.hl_rect.right, state->vobsub.hl_rect.bottom);
/* Update all the palette caches */
gstspu_vobsub_update_palettes (dvdspu, state);
/* Set up HL or Change Color & Contrast rect tracking */
if (state->vobsub.hl_rect.top != -1) {
state->vobsub.cur_chg_col = &state->vobsub.hl_ctrl_i;
state->vobsub.cur_chg_col_end = state->vobsub.cur_chg_col + 1;
} else if (state->vobsub.n_line_ctrl_i > 0) {
state->vobsub.cur_chg_col = state->vobsub.line_ctrl_i;
state->vobsub.cur_chg_col_end =
state->vobsub.cur_chg_col + state->vobsub.n_line_ctrl_i;
} else
state->vobsub.cur_chg_col = NULL;
/* We start rendering from the first line of the display rect */
y = state->vobsub.disp_rect.top;
last_y = state->vobsub.disp_rect.bottom;
/* When reading RLE data, we track the offset in nibbles... */
state->vobsub.max_offset = state->vobsub.pix_buf_map.size * 2;
if (y & 1) {
cur_offsets[1] = state->vobsub.pix_data[0] * 2;
cur_offsets[0] = state->vobsub.pix_data[1] * 2;
} else {
cur_offsets[0] = state->vobsub.pix_data[0] * 2;
cur_offsets[1] = state->vobsub.pix_data[1] * 2;
}
/* Render line by line */
for (state->vobsub.cur_Y = y; state->vobsub.cur_Y <= last_y;
state->vobsub.cur_Y++) {
gstspu_vobsub_render_line (state, frame,
&cur_offsets[state->vobsub.cur_Y & 1]);
}
/* for debugging purposes, draw a faint rectangle at the edges of the disp_rect */
if ((dvdspu_debug_flags & GST_DVD_SPU_DEBUG_RENDER_RECTANGLE) != 0) {
gstspu_vobsub_draw_highlight (state, frame, &state->vobsub.disp_rect);
}
/* For debugging purposes, draw a faint rectangle around the highlight rect */
if ((dvdspu_debug_flags & GST_DVD_SPU_DEBUG_HIGHLIGHT_RECTANGLE) != 0
&& state->vobsub.hl_rect.top != -1) {
gstspu_vobsub_draw_highlight (state, frame, &state->vobsub.hl_rect);
}
gst_buffer_unmap (state->vobsub.pix_buf, &state->vobsub.pix_buf_map);
}