move codec parameter string code in remuxer; init frag for transcodes

1 files changed, 38 insertions, 0 deletions

diff --git a/remuxer/src/codec_param/av1.rs b/remuxer/src/codec_param/av1.rs
new file mode 100644
index 0000000..5641e77
--- /dev/null
+++ b/remuxer/src/codec_param/av1.rs
@@ -0,0 +1,38 @@
+/*
+    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
+    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
+    Copyright (C) 2026 metamuffin <metamuffin.org>
+*/
+
+pub fn av1_codec_param(cp: &[u8]) -> String {
+    let profile = (cp[1] >> 5) & 0b111;
+    let level = cp[1] & 0b11111;
+    let tier = (cp[2] >> 7) & 0b1;
+    let high_bitdepth = (cp[2] >> 6) & 0b1;
+    let twelve_bit = (cp[2] >> 5) & 0b1;
+    let _monochrome = (cp[2] >> 4) & 0b1;
+    let _css_x = (cp[2] >> 3) & 0b1;
+    let _css_y = (cp[2] >> 2) & 0b1;
+    let _css_pos = cp[2] & 0b11;
+
+    let tier_char = if tier == 1 { 'H' } else { 'M' };
+    let bit_depth = if twelve_bit == 1 {
+        12
+    } else if high_bitdepth == 1 {
+        10
+    } else {
+        0
+    };
+    format!(
+        "av01.{profile}.{level:02}{tier_char}.{bit_depth:02}" // .{monochrome}.{css_x}{css_y}{css_pos}
+    )
+}
+
+#[test]
+fn sample1() {
+    assert_eq!(av1_codec_param(&[0x81, 0x04, 0x4E]), "av01.0.04M.10");
+}
+#[test]
+fn sample2() {
+    assert_eq!(av1_codec_param(&[0x81, 0x35, 0xF4]), "av01.1.21H.12");
+}