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avfilter/vf_subtitles: Respect YCbCr Matrix header

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As specified in libass's ass_types.h, the colors or ASS_Images
should be converted to YCbCr using the matrix/range specified in
the track's YCbCrMatrix field (unless that field is set to YCBCR_NONE,
and defaulting to TV.601 if the header is missing).

This does not affect any subtitles generated or transcoded by ffmpeg,
since these contain a 'YCbCrMatrix: None' header.

Signed-off-by: arch1t3cht <arch1t3cht@gmail.com>
Signed-off-by: rcombs <rcombs@rcombs.me>
This commit is contained in:
arch1t3cht 2024-10-13 14:45:28 +02:00 committed by rcombs
parent c98810ab47
commit 72e5381123
1 changed files with 37 additions and 1 deletions
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38
libavfilter/vf_subtitles.c
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@ -88,6 +88,40 @@ static const int ass_libavfilter_log_level_map[] = {
[7] = AV_LOG_DEBUG, /* MSGL_DBG2 */
};
static enum AVColorSpace ass_get_color_space(ASS_YCbCrMatrix ass_matrix, enum AVColorSpace inlink_space) {
switch (ass_matrix) {
case YCBCR_NONE: return inlink_space;
case YCBCR_SMPTE240M_TV:
case YCBCR_SMPTE240M_PC: return AVCOL_SPC_SMPTE240M;
case YCBCR_FCC_TV:
case YCBCR_FCC_PC: return AVCOL_SPC_FCC;
case YCBCR_BT709_TV:
case YCBCR_BT709_PC: return AVCOL_SPC_BT709;
case YCBCR_BT601_TV:
case YCBCR_BT601_PC:
case YCBCR_DEFAULT:
case YCBCR_UNKNOWN:
default: return AVCOL_SPC_SMPTE170M;
}
}
static enum AVColorRange ass_get_color_range(ASS_YCbCrMatrix ass_matrix, enum AVColorRange inlink_range) {
switch (ass_matrix) {
case YCBCR_NONE: return inlink_range;
case YCBCR_SMPTE240M_PC:
case YCBCR_FCC_PC:
case YCBCR_BT709_PC:
case YCBCR_BT601_PC: return AVCOL_RANGE_JPEG;
case YCBCR_SMPTE240M_TV:
case YCBCR_FCC_TV:
case YCBCR_BT709_TV:
case YCBCR_BT601_TV:
case YCBCR_DEFAULT:
case YCBCR_UNKNOWN:
default: return AVCOL_RANGE_MPEG;
}
}
static void ass_log(int ass_level, const char *fmt, va_list args, void *ctx)
{
const int ass_level_clip = av_clip(ass_level, 0,
@ -150,7 +184,9 @@ static int config_input(AVFilterLink *inlink)
{
AssContext *ass = inlink->dst->priv;
ff_draw_init2(&ass->draw, inlink->format, inlink->colorspace, inlink->color_range,
ff_draw_init2(&ass->draw, inlink->format,
ass_get_color_space(ass->track->YCbCrMatrix, inlink->colorspace),
ass_get_color_range(ass->track->YCbCrMatrix, inlink->color_range),
ass->alpha ? FF_DRAW_PROCESS_ALPHA : 0);
ass_set_frame_size (ass->renderer, inlink->w, inlink->h);