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qtmux: Implement rotation tag support

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Mirroring the demux element and isomp4mux from gst-plugins-rs.

Tested against other Gst elements and MPV. Note that the later
apparently does not show correct results for flipped values.

Can be tested with:
```
gst-launch-1.0 \
videotestsrc num-buffers=90 ! \
taginject tags="image-orientation=rotate-90" ! \
capsfilter caps=video/x-raw,width=640,height=480,max-framerate=30/1 ! \
videoconvert ! \
queue ! \
openh264enc ! \
queue ! \
h264parse ! \
mp4mux ! \
filesink location=./test.mp4
```

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8371>
This commit is contained in:
Robert Mader 2025-01-19 18:49:57 +01:00 committed by GStreamer Marge Bot
parent edf157beb5
commit 1fc6f0d349
1 changed files with 69 additions and 0 deletions
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69
subprojects/gst-plugins-good/gst/isomp4/gstqtmux.c
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@ -1817,6 +1817,62 @@ gst_qt_mux_add_metadata_tags (GstQTMux * qtmux, const GstTagList * list,
return;
}
static void
gst_qt_mux_set_matrix_from_tags (guint32 * matrix, const GstTagList * tags)
{
gchar *orientation;
if (!tags ||
!gst_tag_list_get_string (tags, "image-orientation", &orientation))
return;
if (!g_strcmp0 ("rotate-0", orientation)) {
matrix[0] = 1 << 16;
matrix[1] = 0;
matrix[3] = 0;
matrix[4] = 1 << 16;
} else if (!g_strcmp0 ("rotate-90", orientation)) {
matrix[0] = 0;
matrix[1] = 1 << 16;
matrix[3] = G_MAXUINT16 << 16;
matrix[4] = 0;
} else if (!g_strcmp0 ("rotate-180", orientation)) {
matrix[0] = G_MAXUINT16 << 16;
matrix[1] = 0;
matrix[3] = 0;
matrix[4] = G_MAXUINT16 << 16;
} else if (!g_strcmp0 ("rotate-270", orientation)) {
matrix[0] = 0;
matrix[1] = G_MAXUINT16 << 16;
matrix[3] = 1 << 16;
matrix[4] = 0;
} else if (!g_strcmp0 ("flip-rotate-0", orientation)) {
matrix[0] = G_MAXUINT16 << 16;
matrix[1] = 0;
matrix[3] = 0;
matrix[4] = 1 << 16;
} else if (!g_strcmp0 ("flip-rotate-90", orientation)) {
matrix[0] = 0;
matrix[1] = G_MAXUINT16 << 16;
matrix[3] = G_MAXUINT16 << 16;
matrix[4] = 0;
} else if (!g_strcmp0 ("flip-rotate-180", orientation)) {
matrix[0] = 1 << 16;
matrix[1] = 0;
matrix[3] = 0;
matrix[4] = G_MAXUINT16 << 16;
} else if (!g_strcmp0 ("flip-rotate-270", orientation)) {
matrix[0] = 0;
matrix[1] = 1 << 16;
matrix[3] = 1 << 16;
matrix[4] = 0;
} else {
GST_WARNING ("Unsupported orientation %s", orientation);
}
g_free (orientation);
}
/*
* Gets the tagsetter iface taglist and puts the known tags
* into the output stream
@ -1825,6 +1881,7 @@ static void
gst_qt_mux_setup_metadata (GstQTMux * qtmux)
{
const GstTagList *tags = NULL;
guint32 transform_matrix[9] = { 0 };
GList *l;
GST_OBJECT_LOCK (qtmux);
@ -1852,6 +1909,12 @@ gst_qt_mux_setup_metadata (GstQTMux * qtmux)
GST_DEBUG_OBJECT (qtmux, "No new tags received");
}
/* Initialize to identity */
transform_matrix[0] = 1 << 16;
transform_matrix[4] = 1 << 16;
transform_matrix[8] = 1 << 30;
gst_qt_mux_set_matrix_from_tags (transform_matrix, tags);
GST_OBJECT_LOCK (qtmux);
for (l = GST_ELEMENT (qtmux)->sinkpads; l; l = l->next) {
GstQTMuxPad *qpad = GST_QT_MUX_PAD (l->data);
@ -1860,6 +1923,12 @@ gst_qt_mux_setup_metadata (GstQTMux * qtmux)
GST_DEBUG_OBJECT (qpad, "Adding tags");
gst_tag_list_remove_tag (qpad->tags, GST_TAG_CONTAINER_FORMAT);
gst_qt_mux_add_metadata_tags (qtmux, qpad->tags, &qpad->trak->udta);
/* Use the matrix from the stream tags if available, otherwise fall back
* to global tags or identity. */
memcpy (qpad->trak->tkhd.matrix, transform_matrix, sizeof (guint32) * 9);
gst_qt_mux_set_matrix_from_tags (qpad->trak->tkhd.matrix, qpad->tags);
qpad->tags_changed = FALSE;
GST_DEBUG_OBJECT (qpad, "Tags added");
} else {