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lavc/libzvbi-teletextdec: add support for setting background opacity

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Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2016-01-21 23:57:50 +01:00
parent 92f2a9dbc5
commit 73e4565dff
3 changed files with 24 additions and 4 deletions
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8
doc/decoders.texi
View File

@ -282,7 +282,13 @@ Sets the display duration of the decoded teletext pages or subtitles in
miliseconds. Default value is 30000 which is 30 seconds.
@item txt_transparent
Force transparent background of the generated teletext bitmaps. Default value
is 0 which means an opaque (black) background.
is 0 which means an opaque background.
@item txt_opacity
Sets the opacity (0-255) of the teletext background. If
@option{txt_transparent} is not set, it only affects characters between a start
box and an end box, typically subtitles. Default value is 0 if
@option{txt_transparent} is set, 255 otherwise.
@end table
@c man end SUBTILES DECODERS

18
libavcodec/libzvbi-teletextdec.c
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@ -59,6 +59,7 @@ typedef struct TeletextContext
int chop_top;
int sub_duration; /* in msec */
int transparent_bg;
int opacity;
int chop_spaces;
int lines_processed;
@ -210,9 +211,16 @@ static void fix_transparency(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi
memset(pixel, VBI_TRANSPARENT_BLACK, BITMAP_CHAR_WIDTH);
break;
case VBI_OPAQUE:
case VBI_SEMI_TRANSPARENT:
if (!ctx->transparent_bg)
break;
case VBI_SEMI_TRANSPARENT:
if (ctx->opacity > 0) {
if (ctx->opacity < 255)
for(; pixel < pixelnext; pixel++)
if (*pixel == vc->background)
*pixel += VBI_NB_COLORS;
break;
}
case VBI_TRANSPARENT_FULL:
for(; pixel < pixelnext; pixel++)
if (*pixel == vc->background)
@ -259,7 +267,7 @@ static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_pa
sub_rect->y = ctx->y_offset + chop_top * BITMAP_CHAR_HEIGHT;
sub_rect->w = resx;
sub_rect->h = resy;
sub_rect->nb_colors = VBI_NB_COLORS;
sub_rect->nb_colors = ctx->opacity > 0 && ctx->opacity < 255 ? 2 * VBI_NB_COLORS : VBI_NB_COLORS;
sub_rect->data[1] = av_mallocz(AVPALETTE_SIZE);
if (!sub_rect->data[1]) {
av_freep(&sub_rect->data[0]);
@ -273,9 +281,11 @@ static int gen_sub_bitmap(TeletextContext *ctx, AVSubtitleRect *sub_rect, vbi_pa
b = VBI_B(page->color_map[ci]);
a = VBI_A(page->color_map[ci]);
((uint32_t *)sub_rect->data[1])[ci] = RGBA(r, g, b, a);
((uint32_t *)sub_rect->data[1])[ci + VBI_NB_COLORS] = RGBA(r, g, b, ctx->opacity);
ff_dlog(ctx, "palette %0x\n", ((uint32_t *)sub_rect->data[1])[ci]);
}
((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK] = RGBA(0, 0, 0, 0);
((uint32_t *)sub_rect->data[1])[VBI_TRANSPARENT_BLACK + VBI_NB_COLORS] = RGBA(0, 0, 0, 0);
sub_rect->type = SUBTITLE_BITMAP;
return 0;
}
@ -511,6 +521,9 @@ static int teletext_init_decoder(AVCodecContext *avctx)
ctx->vbi = NULL;
ctx->pts = AV_NOPTS_VALUE;
if (ctx->opacity == -1)
ctx->opacity = ctx->transparent_bg ? 0 : 255;
#ifdef DEBUG
{
char *t;
@ -554,6 +567,7 @@ static const AVOption options[] = {
{"txt_chop_spaces", "chops leading and trailing spaces from text", OFFSET(chop_spaces), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, SD},
{"txt_duration", "display duration of teletext pages in msecs", OFFSET(sub_duration), AV_OPT_TYPE_INT, {.i64 = 30000}, 0, 86400000, SD},
{"txt_transparent", "force transparent background of the teletext", OFFSET(transparent_bg), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD},
{"txt_opacity", "set opacity of the transparent background", OFFSET(opacity), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, SD},
{ NULL },
};

2
libavcodec/version.h
View File

@ -30,7 +30,7 @@
#define LIBAVCODEC_VERSION_MAJOR 57
#define LIBAVCODEC_VERSION_MINOR 22
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_MICRO 101
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \