gstreamer/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]];
/* Convert incoming 4-bit alpha to 8 bit for blending */
dest->A = (alpha[i] << 4) | alpha[i];
dest->Y = ((guint16) ((col >> 16) & 0xff)) * dest->A;
/* U/V are stored as V/U in the clut words, so switch them */
dest->V = ((guint16) ((col >> 8) & 0xff)) * dest->A;
dest->U = ((guint16) (col & 0xff)) * dest->A;
}
} else {
int y = 240;
/* 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[0].Y = y * dest[0].A;
y -= 112;
if (y < 0)
y = 0;
}
dest[0].U = 128 * dest[0].A;
dest[0].V = 128 * dest[0].A;
}
}
}
/* 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 */
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gst_buffer_extract (state->vobsub.pix_buf, (*rle_offset) / 2, &ret, 1);
/* 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 void
gstspu_vobsub_draw_rle_run (SpuState * state, gint16 x, gint16 end,
SpuColour * colour)
{
#if 0
GST_LOG ("Y: %d x: %d end %d col %d %d %d %d",
state->vobsub.cur_Y, x, end, colour->Y, colour->U, colour->V, colour->A);
#endif
if (colour->A != 0) {
guint32 inv_A = 0xff - colour->A;
/* FIXME: This could be more efficient */
while (x < end) {
state->vobsub.out_Y[x] =
(inv_A * state->vobsub.out_Y[x] + colour->Y) / 0xff;
state->vobsub.out_U[x / 2] += colour->U;
state->vobsub.out_V[x / 2] += colour->V;
state->vobsub.out_A[x / 2] += colour->A;
x++;
}
/* Update the compositing buffer so we know how much to blend later */
*(state->vobsub.comp_last_x_ptr) = end - 1; /* end is the start of the *next* run */
}
}
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 void gstspu_vobsub_render_line_with_chgcol (SpuState * state,
guint8 * planes[3], guint16 * rle_offset);
static gboolean gstspu_vobsub_update_chgcol (SpuState * state);
static void
gstspu_vobsub_render_line (SpuState * state, guint8 * planes[3],
guint16 * rle_offset)
{
gint16 x, next_x, end, rle_code, next_draw_x;
SpuColour *colour;
/* 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) {
gstspu_vobsub_render_line_with_chgcol (state, planes, rle_offset);
return;
}
}
}
/* No special case. Render as normal */
/* Set up our output pointers */
state->vobsub.out_Y = planes[0];
state->vobsub.out_U = state->comp_bufs[0];
state->vobsub.out_V = state->comp_bufs[1];
state->vobsub.out_A = state->comp_bufs[2];
/* 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.clip_rect.right)
next_draw_x = state->vobsub.clip_rect.right; /* ensure no overflow */
/* Now draw the run between [x,next_x) */
gstspu_vobsub_draw_rle_run (state, x, next_draw_x, colour);
x = next_x;
}
}
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 void
gstspu_vobsub_render_line_with_chgcol (SpuState * state, guint8 * planes[3],
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;
gint16 cur_reg_end;
gint i;
state->vobsub.out_Y = planes[0];
state->vobsub.out_U = state->comp_bufs[0];
state->vobsub.out_V = state->comp_bufs[1];
state->vobsub.out_A = state->comp_bufs[2];
/* 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
* the global palette/alpha need using initally */
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.clip_rect.right)
run_draw_end = state->vobsub.clip_rect.right; /* ensure no overflow */
if (G_LIKELY (x < run_end)) {
colour = &cur_pix_ctrl->pal_cache[rle_code & 3];
gstspu_vobsub_draw_rle_run (state, 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;
}
}
}
}
static void
gstspu_vobsub_blend_comp_buffers (SpuState * state, guint8 * planes[3])
{
state->comp_left = state->vobsub.disp_rect.left;
state->comp_right =
MAX (state->vobsub.comp_last_x[0], state->vobsub.comp_last_x[1]);
state->comp_left = MAX (state->comp_left, state->vobsub.clip_rect.left);
state->comp_right = MIN (state->comp_right, state->vobsub.clip_rect.right);
gstspu_blend_comp_buffers (state, planes);
}
static void
gstspu_vobsub_clear_comp_buffers (SpuState * state)
{
state->comp_left = state->vobsub.clip_rect.left;
state->comp_right = state->vobsub.clip_rect.right;
gstspu_clear_comp_buffers (state);
state->vobsub.comp_last_x[0] = -1;
state->vobsub.comp_last_x[1] = -1;
}
static void
gstspu_vobsub_draw_highlight (SpuState * state,
GstVideoFrame * frame, SpuRect * rect)
{
guint8 *cur;
gint16 pos;
gint ystride;
ystride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
cur = GST_VIDEO_FRAME_COMP_DATA (frame, 0) + ystride * rect->top;
for (pos = rect->left + 1; pos < rect->right; pos++)
cur[pos] = (cur[pos] / 2) + 0x8;
cur = GST_VIDEO_FRAME_COMP_DATA (frame, 0) + ystride * rect->bottom;
for (pos = rect->left + 1; pos < rect->right; pos++)
cur[pos] = (cur[pos] / 2) + 0x8;
cur = GST_VIDEO_FRAME_COMP_DATA (frame, 0) + ystride * rect->top;
for (pos = rect->top; pos <= rect->bottom; pos++) {
cur[rect->left] = (cur[rect->left] / 2) + 0x8;
cur[rect->right] = (cur[rect->right] / 2) + 0x8;
cur += ystride;
}
}
void
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gstspu_vobsub_render (GstDVDSpu * dvdspu, GstVideoFrame * frame)
{
SpuState *state = &dvdspu->spu_state;
guint8 *planes[3]; /* YUV frame pointers */
gint y, last_y;
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gint width, height;
gint strides[3];
/* Set up our initial state */
if (G_UNLIKELY (state->vobsub.pix_buf == NULL))
return;
/* Store the start of each plane */
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planes[0] = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
planes[1] = GST_VIDEO_FRAME_COMP_DATA (frame, 1);
planes[2] = GST_VIDEO_FRAME_COMP_DATA (frame, 2);
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strides[0] = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
strides[1] = GST_VIDEO_FRAME_COMP_STRIDE (frame, 1);
strides[2] = GST_VIDEO_FRAME_COMP_STRIDE (frame, 2);
width = GST_VIDEO_FRAME_WIDTH (frame);
height = GST_VIDEO_FRAME_HEIGHT (frame);
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);
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GST_DEBUG_OBJECT (dvdspu, "video size %d,%d", width, height);
/* When reading RLE data, we track the offset in nibbles... */
state->vobsub.cur_offsets[0] = state->vobsub.pix_data[0] * 2;
state->vobsub.cur_offsets[1] = state->vobsub.pix_data[1] * 2;
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state->vobsub.max_offset = gst_buffer_get_size (state->vobsub.pix_buf) * 2;
/* 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;
state->vobsub.clip_rect.left = state->vobsub.disp_rect.left;
state->vobsub.clip_rect.right = state->vobsub.disp_rect.right;
/* center the image when display rectangle exceeds the video width */
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if (width <= state->vobsub.disp_rect.right) {
gint left, disp_width;
disp_width = state->vobsub.disp_rect.right - state->vobsub.disp_rect.left
+ 1;
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left = (width - disp_width) / 2;
state->vobsub.disp_rect.left = left;
state->vobsub.disp_rect.right = left + disp_width - 1;
/* if it clips to the right, shift it left, but only till zero */
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if (state->vobsub.disp_rect.right >= width) {
gint shift = state->vobsub.disp_rect.right - width - 1;
if (shift > state->vobsub.disp_rect.left)
shift = state->vobsub.disp_rect.left;
state->vobsub.disp_rect.left -= shift;
state->vobsub.disp_rect.right -= shift;
}
/* init clip to disp */
state->vobsub.clip_rect.left = state->vobsub.disp_rect.left;
state->vobsub.clip_rect.right = state->vobsub.disp_rect.right;
/* clip right after the shift */
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if (state->vobsub.clip_rect.right >= width)
state->vobsub.clip_rect.right = width - 1;
GST_DEBUG_OBJECT (dvdspu,
"clipping width to %d,%d", state->vobsub.clip_rect.left,
state->vobsub.clip_rect.right);
}
/* for the height, bring it up till it fits as well as it can. We
* assume the picture is in the lower part. We should better check where it
* is and do something more clever. */
state->vobsub.clip_rect.top = state->vobsub.disp_rect.top;
state->vobsub.clip_rect.bottom = state->vobsub.disp_rect.bottom;
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if (height <= state->vobsub.disp_rect.bottom) {
/* shift it up, but only till zero */
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gint shift = state->vobsub.disp_rect.bottom - height - 1;
if (shift > state->vobsub.disp_rect.top)
shift = state->vobsub.disp_rect.top;
state->vobsub.disp_rect.top -= shift;
state->vobsub.disp_rect.bottom -= shift;
/* start on even line */
if (state->vobsub.disp_rect.top & 1) {
state->vobsub.disp_rect.top--;
state->vobsub.disp_rect.bottom--;
}
/* init clip to disp */
state->vobsub.clip_rect.top = state->vobsub.disp_rect.top;
state->vobsub.clip_rect.bottom = state->vobsub.disp_rect.bottom;
/* clip right after the shift */
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if (state->vobsub.clip_rect.bottom >= height)
state->vobsub.clip_rect.bottom = height - 1;
GST_DEBUG_OBJECT (dvdspu,
"clipping height to %d,%d", state->vobsub.clip_rect.top,
state->vobsub.clip_rect.bottom);
}
/* We start rendering from the first line of the display rect */
y = state->vobsub.disp_rect.top;
/* start_y is always an even number and we render lines in pairs from there,
* accumulating 2 lines of chroma then blending it. We might need to render a
* single line at the end if the display rect ends on an even line too. */
last_y = (state->vobsub.disp_rect.bottom - 1) & ~(0x01);
/* Update our plane references to the first line of the disp_rect */
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planes[0] += strides[0] * y;
planes[1] += strides[1] * (y / 2);
planes[2] += strides[2] * (y / 2);
for (state->vobsub.cur_Y = y; state->vobsub.cur_Y <= last_y;
state->vobsub.cur_Y++) {
gboolean clip;
clip = (state->vobsub.cur_Y < state->vobsub.clip_rect.top
|| state->vobsub.cur_Y > state->vobsub.clip_rect.bottom);
/* Reset the compositing buffer */
gstspu_vobsub_clear_comp_buffers (state);
/* Render even line */
state->vobsub.comp_last_x_ptr = state->vobsub.comp_last_x;
gstspu_vobsub_render_line (state, planes, &state->vobsub.cur_offsets[0]);
if (!clip) {
/* Advance the luminance output pointer */
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planes[0] += strides[0];
}
state->vobsub.cur_Y++;
/* Render odd line */
state->vobsub.comp_last_x_ptr = state->vobsub.comp_last_x + 1;
gstspu_vobsub_render_line (state, planes, &state->vobsub.cur_offsets[1]);
if (!clip) {
/* Blend the accumulated UV compositing buffers onto the output */
gstspu_vobsub_blend_comp_buffers (state, planes);
/* Update all the output pointers */
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planes[0] += strides[0];
planes[1] += strides[1];
planes[2] += strides[2];
}
}
if (state->vobsub.cur_Y == state->vobsub.disp_rect.bottom) {
gboolean clip;
clip = (state->vobsub.cur_Y < state->vobsub.clip_rect.top
|| state->vobsub.cur_Y > state->vobsub.clip_rect.bottom);
g_assert ((state->vobsub.disp_rect.bottom & 0x01) == 0);
if (!clip) {
/* Render a remaining lone last even line. y already has the correct value
* after the above loop exited. */
gstspu_vobsub_clear_comp_buffers (state);
state->vobsub.comp_last_x_ptr = state->vobsub.comp_last_x;
gstspu_vobsub_render_line (state, planes, &state->vobsub.cur_offsets[0]);
gstspu_vobsub_blend_comp_buffers (state, planes);
}
}
/* 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);
}
}