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

1 files changed, 55 insertions, 0 deletions

diff --git a/remuxer/src/codec_param/hevc.rs b/remuxer/src/codec_param/hevc.rs
new file mode 100644
index 0000000..3459258
--- /dev/null
+++ b/remuxer/src/codec_param/hevc.rs
@@ -0,0 +1,55 @@
+/*
+    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>
+*/
+
+use std::fmt::Write;
+
+pub(super) fn hevc_codec_param(cp: &[u8]) -> String {
+    let general_profile_space = cp[1] >> 6;
+    let general_tier_flag = (cp[1] >> 5) & 0b1;
+    let general_profile_idc = cp[1] & 0b11111;
+    let general_level_idc = cp[12];
+    let general_profile_compatibility_flag =
+        u32::from_be_bytes([cp[2], cp[3], cp[4], cp[5]]).reverse_bits();
+    let mut d = String::new();
+    let trailing_zeroes = cp[6..12].iter().rev().take_while(|x| **x == 0).count();
+    for &flag in &cp[6..12 - trailing_zeroes] {
+        write!(d, ".{flag:02x}").unwrap();
+    }
+    format!(
+        "hvc1.{}{}.{:x}.{}{}{d}",
+        match general_profile_space {
+            0 => "",
+            1 => "A",
+            2 => "B",
+            3 => "C",
+            _ => unreachable!(),
+        },
+        general_profile_idc,
+        general_profile_compatibility_flag,
+        match general_tier_flag {
+            0 => 'L',
+            1 => 'H',
+            _ => unreachable!(),
+        },
+        general_level_idc,
+    )
+}
+
+#[test]
+fn sample1() {
+    let cp = [
+        0x01, 0x02, 0x20, 0x00, 0x00, 0x00, 0x90, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3F,
+    ];
+    assert_eq!(hevc_codec_param(&cp), "hvc1.2.4.L63.90")
+}
+
+#[test]
+fn sample2() {
+    let cp = [
+        0x01, 0x01, 0x60, 0x00, 0x00, 0x00, 0xB0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78,
+    ];
+    assert_eq!(hevc_codec_param(&cp), "hvc1.1.6.L120.b0")
+}