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qtdemux: Ignore non-zero values for UV/XY in transformation matrix

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But write an info message about that. The values have been ignored
before !8127 as well.

Fixes #4252

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8559>
This commit is contained in:
Jochen Henneberg 2025-02-26 05:46:58 +01:00 committed by GStreamer Marge Bot
parent 8ab2844443
commit 71d8618daf
1 changed files with 13 additions and 3 deletions
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16
subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
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@ -11559,7 +11559,7 @@ qtdemux_parse_transformation_matrix (GstQTDemux * qtdemux,
/* Check if all matrix elements are either 0, 1 or -1 */
static gboolean
qtdemux_transformation_matrix_is_simple (guint32 * m)
qtdemux_transformation_matrix_is_simple (GstQTDemux * qtdemux, guint32 * m)
{
int i;
@ -11567,6 +11567,16 @@ qtdemux_transformation_matrix_is_simple (guint32 * m)
switch (i) {
case 2:
case 5:
/* 2.30 */
if (m[i] != 0U)
GST_INFO_OBJECT (qtdemux, "Matrix non-zero UV values ignored");
break;
case 6:
case 7:
/* 16.16 */
if (m[i] != 0U)
GST_INFO_OBJECT (qtdemux, "Matrix non-zero XY values ignored");
break;
case 8:
/* 2.30 */
if (m[i] != 0U && m[i] != (1U << 30) && m[i] != (3U << 30))
@ -11592,8 +11602,8 @@ qtdemux_mul_transformation_matrix (GstQTDemux * qtdemux,
#define QTADD_MATRIX(_a,_b) ((_a) + (_b) > 0 ? (1U << 16) : \
((_a) + (_b) < 0) ? (G_MAXUINT16 << 16) : 0u)
if (!qtdemux_transformation_matrix_is_simple (a) ||
!qtdemux_transformation_matrix_is_simple (b)) {
if (!qtdemux_transformation_matrix_is_simple (qtdemux, a) ||
!qtdemux_transformation_matrix_is_simple (qtdemux, b)) {
GST_WARNING_OBJECT (qtdemux,
"Cannot handle transform matrix with element values other than 0, 1 or -1");
/* Pretend to have an identity matrix in this case */