In the absence of an explicitly coded minimal luminance, the current code inferred it to be -1, an invalid value. Yet it did not check the value lateron at all, so that if a valid maximum luminance is encountered, but no minimal luminance, an invalid minimal luminance of -1 is exported. If an minimal luminance element with a negative value is present, it is exported, too. This can be simply fixed by adding a check for the value of the element.
Yet given that a minimal luminance of zero Cd/m² is legal and can be coded with a length of zero, we must not use a fake default value to find out whether the element is present or not. Therefore this patch uses an explicit counter for it. While just at it, also check for max_luminance > min_luminance. Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com> --- libavformat/matroskadec.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index ceb054e8ab..e6f4faa337 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -168,7 +168,7 @@ typedef struct MatroskaMasteringMeta { double white_x; double white_y; double max_luminance; - double min_luminance; + CountedElement min_luminance; } MatroskaMasteringMeta; typedef struct MatroskaTrackVideoColor { @@ -452,7 +452,7 @@ static EbmlSyntax matroska_mastering_meta[] = { { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_y) }, { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_x) }, { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_y) }, - { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } }, + { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 1, 0, offsetof(MatroskaMasteringMeta, min_luminance) }, { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, max_luminance) }, CHILD_OF(matroska_track_video_color) }; @@ -2110,7 +2110,10 @@ static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) { mastering_meta->g_x > 0 && mastering_meta->g_y > 0 && mastering_meta->b_x > 0 && mastering_meta->b_y > 0 && mastering_meta->white_x > 0 && mastering_meta->white_y > 0; - has_mastering_luminance = mastering_meta->max_luminance > 0; + has_mastering_luminance = mastering_meta->max_luminance > + mastering_meta->min_luminance.el.f && + mastering_meta->min_luminance.el.f >= 0 && + mastering_meta->min_luminance.count; if (color->matrix_coefficients != AVCOL_SPC_RESERVED) st->codecpar->color_space = color->matrix_coefficients; @@ -2169,7 +2172,7 @@ static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) { } if (has_mastering_luminance) { metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX); - metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX); + metadata->min_luminance = av_d2q(mastering_meta->min_luminance.el.f, INT_MAX); metadata->has_luminance = 1; } } -- 2.27.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".