My cover letter was sent in a separate email, apologies!
Wesley
On Tue, Mar 17, 2015 at 9:09 PM, Wesley Castro <root...@gmail.com> wrote:
> 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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