fmp4mux: added image orientation tag support

fix #565

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1669>

mux/fmp4/src/fmp4mux/boxes.rs

@@ -11,7 +11,7 @@ use gst::prelude::*;
 use anyhow::{anyhow, bail, Context, Error};
 use std::convert::TryFrom;
 
-use super::Buffer;
+use super::{Buffer, ImageOrientation, IDENTITY_MATRIX};
 
 fn write_box<T, F: FnOnce(&mut Vec<u8>) -> Result<T, Error>>(
     vec: &mut Vec<u8>,
@@ -618,21 +618,15 @@ fn write_tkhd(
     v.extend([0u8; 2]);
 
     // Matrix
-    v.extend(
-        [
-            (1u32 << 16).to_be_bytes(),
-            0u32.to_be_bytes(),
-            0u32.to_be_bytes(),
-            0u32.to_be_bytes(),
-            (1u32 << 16).to_be_bytes(),
-            0u32.to_be_bytes(),
-            0u32.to_be_bytes(),
-            0u32.to_be_bytes(),
-            (16384u32 << 16).to_be_bytes(),
-        ]
-        .into_iter()
-        .flatten(),
-    );
+    let matrix = match s.name().as_str() {
+        x if x.starts_with("video/") || x.starts_with("image/") => _cfg
+            .orientation
+            .unwrap_or(ImageOrientation::Rotate0)
+            .transform_matrix(),
+        _ => &IDENTITY_MATRIX,
+    };
+
+    v.extend(matrix.iter().flatten());
 
     // Width/height
     match s.name().as_str() {

mux/fmp4/src/fmp4mux/imp.rs

@@ -17,6 +17,7 @@ use std::mem;
 use std::sync::Mutex;
 
 use crate::fmp4mux::obu::read_seq_header_obu_bytes;
+use crate::fmp4mux::ImageOrientation;
 use once_cell::sync::Lazy;
 
 use super::boxes;
@@ -255,6 +256,8 @@ struct State {
     start_dts: Option<gst::ClockTime>,
     /// Language code from tags
     language_code: Option<[u8; 3]>,
+    /// Orientation from tags
+    orientation: Option<ImageOrientation>,
 
     /// Start PTS of the current fragment
     fragment_start_pts: Option<gst::ClockTime>,
@@ -2788,6 +2791,7 @@ impl FMP4Mux {
             write_mehd: settings.write_mehd,
             duration: if at_eos { duration } else { None },
             language_code: state.language_code,
+            orientation: state.orientation,
             start_utc_time: if variant == super::Variant::ONVIF {
                 state
                     .earliest_pts
@@ -3241,6 +3245,28 @@ impl AggregatorImpl for FMP4Mux {
                         }
                         state.language_code = Some(language_code);
                     }
+                } else if let Some(tag_value) = ev.tag().get::<gst::tags::ImageOrientation>() {
+                    let orientation = tag_value.get();
+                    gst::trace!(
+                        CAT,
+                        imp = self,
+                        "Received image orientation from tags: {:?}",
+                        orientation
+                    );
+
+                    let mut state = self.state.lock().unwrap();
+                    state.orientation = match orientation {
+                        "rotate-0" => Some(ImageOrientation::Rotate0),
+                        "rotate-90" => Some(ImageOrientation::Rotate90),
+                        "rotate-180" => Some(ImageOrientation::Rotate180),
+                        "rotate-270" => Some(ImageOrientation::Rotate270),
+                        // TODO:
+                        // "flip-rotate-0" => Some(ImageOrientation::FlipRotate0),
+                        // "flip-rotate-90" => Some(ImageOrientation::FlipRotate90),
+                        // "flip-rotate-180" => Some(ImageOrientation::FlipRotate180),
+                        // "flip-rotate-270" => Some(ImageOrientation::FlipRotate270),
+                        _ => None,
+                    }
                 }
 
                 self.parent_sink_event(aggregator_pad, event)

mux/fmp4/src/fmp4mux/mod.rs

@@ -73,6 +73,80 @@ pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
     Ok(())
 }
 
+#[derive(Debug, Copy, Clone)]
+pub(crate) enum ImageOrientation {
+    Rotate0,
+    Rotate90,
+    Rotate180,
+    Rotate270,
+    // TODO:
+    // FlipRotate0,
+    // FlipRotate90,
+    // FlipRotate180,
+    // FlipRotate270,
+}
+
+type TransformMatrix = [[u8; 4]; 9];
+
+const IDENTITY_MATRIX: TransformMatrix = [
+    (1u32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    (1u32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    (1u32 << 30).to_be_bytes(),
+];
+
+const ROTATE_90_MATRIX: TransformMatrix = [
+    0u32.to_be_bytes(),
+    (1u32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    (-1i32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    (1u32 << 30).to_be_bytes(),
+];
+
+const ROTATE_180_MATRIX: TransformMatrix = [
+    (-1i32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    (-1i32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    (1u32 << 30).to_be_bytes(),
+];
+
+const ROTATE_270_MATRIX: TransformMatrix = [
+    0u32.to_be_bytes(),
+    (-1i32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    (1u32 << 16).to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    0u32.to_be_bytes(),
+    (1u32 << 30).to_be_bytes(),
+];
+
+impl ImageOrientation {
+    pub(crate) fn transform_matrix(&self) -> &'static TransformMatrix {
+        match self {
+            ImageOrientation::Rotate0 => &IDENTITY_MATRIX,
+            ImageOrientation::Rotate90 => &ROTATE_90_MATRIX,
+            ImageOrientation::Rotate180 => &ROTATE_180_MATRIX,
+            ImageOrientation::Rotate270 => &ROTATE_270_MATRIX,
+        }
+    }
+}
+
 #[derive(Debug)]
 pub(crate) struct HeaderConfiguration {
     variant: Variant,
@@ -88,6 +162,7 @@ pub(crate) struct HeaderConfiguration {
     write_mehd: bool,
     duration: Option<gst::ClockTime>,
     language_code: Option<[u8; 3]>,
+    orientation: Option<ImageOrientation>,
 
     /// Start UTC time in ONVIF mode.
     /// Since Jan 1 1601 in 100ns units.