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lavc/movtextenc: add alpha tag handling

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Signed-off-by: Philip Langdale <philipl@overt.org>
This commit is contained in:
John Stebbins 2020-04-04 16:34:16 -06:00 committed by Philip Langdale
parent b847bd9582
commit 2e79843e37
1 changed files with 24 additions and 1 deletions
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25
libavcodec/movtextenc.c
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@ -351,6 +351,26 @@ static void mov_text_color_cb(void *priv, unsigned int color, unsigned int color
*/
}
static void mov_text_alpha_set(MovTextContext *s, uint8_t alpha)
{
if (!s->style_attributes_temp ||
(s->style_attributes_temp->style_color & 0xff) == alpha) {
// color hasn't changed
return;
}
if (mov_text_style_start(s))
s->style_attributes_temp->style_color =
(s->style_attributes_temp->style_color & 0xffffff00) | alpha;
}
static void mov_text_alpha_cb(void *priv, int alpha, int alpha_id)
{
MovTextContext *s = priv;
if (alpha_id == 1) // primary alpha changes
mov_text_alpha_set(s, 255 - alpha);
}
static void mov_text_end_cb(void *priv)
{
// End of text, close any open style record
@ -360,7 +380,7 @@ static void mov_text_end_cb(void *priv)
static void mov_text_dialog(MovTextContext *s, ASSDialog *dialog)
{
ASSStyle * style = ff_ass_style_get(s->ass_ctx, dialog->style);
uint8_t style_flags;
uint8_t style_flags, alpha;
uint32_t color;
if (style) {
@ -370,6 +390,8 @@ static void mov_text_dialog(MovTextContext *s, ASSDialog *dialog)
mov_text_style_set(s, style_flags);
color = BGR_TO_RGB(style->primary_color & 0xffffff) << 8;
mov_text_color_set(s, color);
alpha = 255 - ((uint32_t)style->primary_color >> 24);
mov_text_alpha_set(s, alpha);
}
}
@ -416,6 +438,7 @@ static const ASSCodesCallbacks mov_text_callbacks = {
.new_line = mov_text_new_line_cb,
.style = mov_text_style_cb,
.color = mov_text_color_cb,
.alpha = mov_text_alpha_cb,
.end = mov_text_end_cb,
};