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avformat/matroskadec: Export rectangular projection as displaymatrix 

This is the officially supported way to express rotations
and flips in Matroska.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-01-21 19:42:50 +01:00
parent b065a70afa
commit 937bb6bbc1
1 changed files with 41 additions and 3 deletions
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44
libavformat/matroskadec.c
View File

@ -37,6 +37,7 @@
#include "libavutil/base64.h"
#include "libavutil/bprint.h"
#include "libavutil/dict.h"
#include "libavutil/display.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lzo.h"
@ -2231,6 +2232,44 @@ static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
return 0;
}
static int mkv_create_display_matrix(AVStream *st,
const MatroskaTrackVideoProjection *proj,
void *logctx)
{
double pitch = proj->pitch, yaw = proj->yaw, roll = proj->roll;
int32_t *matrix;
int hflip;
if (pitch == 0.0 && yaw == 0.0 && roll == 0.0)
return 0;
/* Note: The following constants are exactly representable
* as floating-point numbers. */
if (pitch != 0.0 || (yaw != 0.0 && yaw != 180.0 && yaw != -180.0) ||
isnan(roll)) {
av_log(logctx, AV_LOG_WARNING, "Ignoring non-2D rectangular "
"projection in stream %u (yaw %f, pitch %f, roll %f)\n",
st->index, yaw, pitch, roll);
return 0;
}
matrix = (int32_t*)av_stream_new_side_data(st, AV_PKT_DATA_DISPLAYMATRIX,
9 * sizeof(*matrix));
if (!matrix)
return AVERROR(ENOMEM);
hflip = yaw != 0.0;
/* ProjectionPoseRoll is in the counter-clockwise direction
* whereas av_display_rotation_set() expects its argument
* to be oriented clockwise, so we need to negate roll.
* Furthermore, if hflip is set, we need to negate it again
* to account for the fact that the Matroska specifications
* require the yaw rotation to be applied first. */
av_display_rotation_set(matrix, roll * (2 * hflip - 1));
av_display_matrix_flip(matrix, hflip, 0);
return 0;
}
static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
void *logctx)
{
@ -2249,6 +2288,8 @@ static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
}
switch (track->video.projection.type) {
case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
return mkv_create_display_matrix(st, mkv_projection, logctx);
case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
if (track->video.projection.private.size == 20) {
t = AV_RB32(priv_data + 4);
@ -2291,9 +2332,6 @@ static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
return AVERROR_INVALIDDATA;
}
break;
case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
/* No Spherical metadata */
return 0;
default:
av_log(logctx, AV_LOG_WARNING,
"Unknown spherical metadata type %"PRIu64"\n",