On 6/17/2024 4:20 PM, Derek Buitenhuis wrote:
This box is provided by files created by the Apple Vision Pro, as well
as the iPhone 15+ when capture for Vision Pro is enabled.
The boxes are a mix of things documented by Apple in some PDFs, their
API docs, and reverse engineering. Ideally we will have a real spec
one day.
Links:
*https://developer.apple.com/av-foundation/Stereo-Video-ISOBMFF-Extensions.pdf
*https://developer.apple.com/documentation/videotoolbox/kvtcompressionpropertykey_horizontaldisparityadjustment
*https://developer.apple.com/documentation/videotoolbox/kvtcompressionpropertykey_stereocamerabaseline
*https://developer.apple.com/documentation/videotoolbox/kvtcompressionpropertykey_heroeye
Signed-off-by: Derek Buitenhuis<derek.buitenh...@gmail.com>
---
libavformat/mov.c | 283 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 283 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 9016cd5ad0..5724b4ef93 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -6477,6 +6477,288 @@ static int mov_read_sv3d(MOVContext *c, AVIOContext
*pb, MOVAtom atom)
return 0;
}
+static int mov_read_vexu_proj(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+ AVStream *st;
+ MOVStreamContext *sc;
+ int size;
+ uint32_t tag;
+ enum AVSphericalProjection projection;
+
+ if (c->fc->nb_streams < 1)
+ return 0;
+
+ st = c->fc->streams[c->fc->nb_streams - 1];
+ sc = st->priv_data;
+
+ if (atom.size != 16) {
+ av_log(c->fc, AV_LOG_ERROR, "Invalid size for proj box: %"PRIu64"\n",
atom.size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ size = avio_rb32(pb);
+ if (size != 16) {
+ av_log(c->fc, AV_LOG_ERROR, "Invalid size for prji box: %d\n", size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ tag = avio_rl32(pb);
+ if (tag != MKTAG('p','r','j','i')) {
+ av_log(c->fc, AV_LOG_ERROR, "Invalid child box of proj box: 0x%08X\n",
tag);
+ return AVERROR_INVALIDDATA;
+ }
+
+ avio_skip(pb, 1); // version
+ avio_skip(pb, 3); // flags
+
+ tag = avio_rl32(pb);
+ switch (tag) {
+ case MKTAG('r','e','c','t'):
+ projection = AV_SPHERICAL_RECTILINEAR;
+ break;
+ case MKTAG('e','q','u','i'):
+ projection = AV_SPHERICAL_EQUIRECTANGULAR;
+ break;
+ case MKTAG('h','e','q','u'):
+ projection = AV_SPHERICAL_HALF_EQUIRECTANGULAR;
+ break;
+ case MKTAG('f','i','s','h'):
+ projection = AV_SPHERICAL_FISHEYE;
+ break;
+ default:
+ av_log(c->fc, AV_LOG_ERROR, "Invalid projection type in prji box:
0x%08X\n", tag);
+ return AVERROR_INVALIDDATA;
+ }
+
+ sc->spherical = av_spherical_alloc(&sc->spherical_size);
+ if (!sc->spherical)
+ return AVERROR(ENOMEM);
+
+ sc->spherical->projection = projection;
+
+ return 0;
+}
+
+static int mov_read_eyes(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+ AVStream *st;
+ MOVStreamContext *sc;
+ int size, flags = 0;
+ int64_t remaining;
+ uint32_t tag, baseline = 0;
+ enum AVStereo3DView view = AV_STEREO3D_VIEW_PACKED;
+ enum AVStereo3DPrimaryEye primary_eye = AV_PRIMARY_EYE_NONE;
+ AVRational horizontal_disparity_adjustment = { 0, 0 };
nit: { 0, 1 }.
Should be ok either way.
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