Bold, italic, and underlined type will be converted to their equivilent ASS
styles when encountered in a text style sample modifier box.
Signed-off-by: Wesley Castro <root...@gmail.com>
---
libavcodec/movtextdec.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 69 insertions(+), 3 deletions(-)
diff --git a/libavcodec/movtextdec.c b/libavcodec/movtextdec.c
index 1c7ffea..4dba1e4 100644
--- a/libavcodec/movtextdec.c
+++ b/libavcodec/movtextdec.c
@@ -26,9 +26,25 @@
#include "libavutil/bprint.h"
#include "libavutil/intreadwrite.h"
-static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end)
+#define STYLE_FLAG_BOLD 1
+#define STYLE_FLAG_ITALIC 2
+#define STYLE_FLAG_UNDERLINE 4
+
+static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end,
+ const char *style_start, const char *style_end,
+ const int style_flags)
{
while (text < text_end) {
+ if (style_flags && text == style_start)
+ {
+ if (style_flags & STYLE_FLAG_BOLD)
+ av_bprintf(buf, "{\\b1}");
+ if (style_flags & STYLE_FLAG_ITALIC)
+ av_bprintf(buf, "{\\i1}");
+ if (style_flags & STYLE_FLAG_UNDERLINE)
+ av_bprintf(buf, "{\\u1}");
+ }
+
switch (*text) {
case '\r':
break;
@@ -36,9 +52,22 @@ static int text_to_ass(AVBPrint *buf, const char *text,
const char *text_end)
av_bprintf(buf, "\\N");
break;
default:
+
av_bprint_chars(buf, *text, 1);
+
break;
}
+
+ if (style_flags && text == style_end)
+ {
+ if (style_flags & STYLE_FLAG_BOLD)
+ av_bprintf(buf, "{\\b1}");
+ if (style_flags & STYLE_FLAG_ITALIC)
+ av_bprintf(buf, "{\\i1}");
+ if (style_flags & STYLE_FLAG_UNDERLINE)
+ av_bprintf(buf, "{\\u1}");
+ }
+
text++;
}
@@ -63,6 +92,9 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
AVBPrint buf;
const char *ptr = avpkt->data;
const char *end;
+ int text_length, tsmb_type, style_entries, style_flags;
+ const char *style_start, *style_end;
+ const uint8_t *tsmb;
if (!ptr || avpkt->size < 2)
return AVERROR_INVALIDDATA;
@@ -82,7 +114,9 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
* In complex cases, there are style descriptors appended to the string
* so we can't just assume the packet size is the string size.
*/
- end = ptr + FFMIN(2 + AV_RB16(ptr), avpkt->size);
+ text_length = AV_RB16(ptr);
+
+ end = ptr + FFMIN(2 + text_length, avpkt->size);
ptr += 2;
ts_start = av_rescale_q(avpkt->pts,
@@ -94,7 +128,39 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
// Note that the spec recommends lines be no longer than 2048 characters.
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
- text_to_ass(&buf, ptr, end);
+
+ if (text_length + 2 != avpkt->size)
+ {
+ tsmb = ptr + text_length;
+
+ //tsmb_size = AV_RB32(tsmb);
+ tsmb += 4;
+ tsmb_type = AV_RB32(tsmb);
+ tsmb += 4;
+
+ if (tsmb_type == MKTAG('s','t','y','l'))
+ {
+ style_entries = AV_RB16(tsmb);
+ tsmb += 2;
+
+ for(int i = 0; i < style_entries;i++)
+ {
+ style_start = ptr + AV_RB16(tsmb);
+ tsmb += 2;
+ style_end = ptr + AV_RB16(tsmb);
+ tsmb += 2;
+ // fontID = AV_RB16(tsmb);
+ tsmb += 2;
+ style_flags = AV_RB8(tsmb++);
+
+
+ text_to_ass(&buf, ptr, end, style_start, style_end,
style_flags);
+ }
+ }
+ }
+ else
+ text_to_ass(&buf, ptr, end, NULL, NULL, 0);
+
ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_end-ts_start);
av_bprint_finalize(&buf, NULL);
if (ret < 0)
--
1.9.1
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