Here is an updated patch (now hopefully going with correct email headers).
From 5866d0dc5536a6ea3f6a899c3d09f19df083c16a Mon Sep 17 00:00:00 2001
From: Harry Mallon <harry.mallon@codex.online>
Date: Wed, 12 Aug 2020 10:26:23 +0100
Subject: [PATCH v4] avformat/mxfdec: Read video range from PictureDescriptor
* Capture black_ref, white_ref and color_range and recognise
full and narrow range.
Signed-off-by: Harry Mallon <harry.mallon@codex.online>
---
libavformat/mxfdec.c | 29 +++++++++++++++++++++++++++++
tests/ref/fate/mxf-probe-dnxhd | 2 +-
tests/ref/fate/mxf-probe-dv25 | 2 +-
3 files changed, 31 insertions(+), 2 deletions(-)
diff --git a/libavformat/mxfdec.c b/libavformat/mxfdec.c
index 4b56984b77..0831ad5768 100644
--- a/libavformat/mxfdec.c
+++ b/libavformat/mxfdec.c
@@ -199,6 +199,9 @@ typedef struct MXFDescriptor {
int bits_per_sample;
int64_t duration; /* ContainerDuration optional property */
unsigned int component_depth;
+ unsigned int black_ref_level;
+ unsigned int white_ref_level;
+ unsigned int color_range;
unsigned int horiz_subsampling;
unsigned int vert_subsampling;
UID *sub_descriptors_refs;
@@ -1222,6 +1225,15 @@ static int mxf_read_generic_descriptor(void *arg,
AVIOContext *pb, int tag, int
case 0x3302:
descriptor->horiz_subsampling = avio_rb32(pb);
break;
+ case 0x3304:
+ descriptor->black_ref_level = avio_rb32(pb);
+ break;
+ case 0x3305:
+ descriptor->white_ref_level = avio_rb32(pb);
+ break;
+ case 0x3306:
+ descriptor->color_range = avio_rb32(pb);
+ break;
case 0x3308:
descriptor->vert_subsampling = avio_rb32(pb);
break;
@@ -2492,6 +2504,23 @@ static int mxf_parse_structural_metadata(MXFContext *mxf)
}
if (descriptor->aspect_ratio.num && descriptor->aspect_ratio.den)
st->display_aspect_ratio = descriptor->aspect_ratio;
+ if (descriptor->component_depth &&
+ descriptor->black_ref_level == 0 &&
+ descriptor->white_ref_level ==
((1<<descriptor->component_depth) - 1) &&
+ descriptor->color_range ==
((1<<descriptor->component_depth) - 1)) {
+ st->codecpar->color_range = AVCOL_RANGE_JPEG;
+ }
+ else if (descriptor->component_depth >= 8 &&
+ descriptor->black_ref_level == (1
<<(descriptor->component_depth - 4)) &&
+ descriptor->white_ref_level ==
(235<<(descriptor->component_depth - 8)) &&
+ descriptor->color_range ==
((14<<(descriptor->component_depth - 4)) + 1)) {
+ st->codecpar->color_range = AVCOL_RANGE_MPEG;
+ }
+ else if (descriptor->black_ref_level ||
descriptor->white_ref_level || descriptor->color_range) {
+ avpriv_request_sample(mxf->fc, "Unrecognized color range
(range %d, b %d, w %d, depth %d)",
+ descriptor->color_range,
descriptor->black_ref_level,
+ descriptor->white_ref_level,
descriptor->component_depth);
+ }
st->codecpar->color_primaries =
mxf_get_codec_ul(ff_mxf_color_primaries_uls,
&descriptor->color_primaries_ul)->id;
st->codecpar->color_trc =
mxf_get_codec_ul(ff_mxf_color_trc_uls, &descriptor->color_trc_ul)->id;
st->codecpar->color_space =
mxf_get_codec_ul(ff_mxf_color_space_uls, &descriptor->color_space_ul)->id;
diff --git a/tests/ref/fate/mxf-probe-dnxhd b/tests/ref/fate/mxf-probe-dnxhd
index 012d3ea1d9..5a6221b1d5 100644
--- a/tests/ref/fate/mxf-probe-dnxhd
+++ b/tests/ref/fate/mxf-probe-dnxhd
@@ -124,7 +124,7 @@ sample_aspect_ratio=1:1
display_aspect_ratio=4:3
pix_fmt=yuv422p
level=-99
-color_range=unknown
+color_range=tv
color_space=bt709
color_transfer=bt709
color_primaries=bt709
diff --git a/tests/ref/fate/mxf-probe-dv25 b/tests/ref/fate/mxf-probe-dv25
index 810f145f41..ffd26c4dfd 100644
--- a/tests/ref/fate/mxf-probe-dv25
+++ b/tests/ref/fate/mxf-probe-dv25
@@ -16,7 +16,7 @@ sample_aspect_ratio=16:15
display_aspect_ratio=4:3
pix_fmt=yuv420p
level=-99
-color_range=unknown
+color_range=tv
color_space=unknown
color_transfer=bt470m
color_primaries=unknown
--
2.28.0
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