From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Tue, 24 Jun 2025 15:45:59 +0000 (+0200)
Subject: h264: ignore some bits in the avcC box
X-Git-Url: https://git.nihav.org/?a=commitdiff_plain;h=344e803e6651acd349bb31d325e4668017309956;p=nihav.git

h264: ignore some bits in the avcC box

Apparently some encoders do not bother about setting them to all ones.
---

diff --git a/nihav-itu/src/codecs/h264/decoder_mt.rs b/nihav-itu/src/codecs/h264/decoder_mt.rs
index b110207..118ba85 100644
--- a/nihav-itu/src/codecs/h264/decoder_mt.rs
+++ b/nihav-itu/src/codecs/h264/decoder_mt.rs
@@ -739,10 +739,10 @@ impl NADecoderMT for H264MTDecoder {
                 let _compatibility      = br.read_byte()?;
                 let _level              = br.read_byte()?;
                 let b                   = br.read_byte()?;
-                validate!((b & 0xFC) == 0xFC);
+                //validate!((b & 0xFC) == 0xFC);
                 self.nal_len            = (b & 3) + 1;
                 let b                   = br.read_byte()?;
-                validate!((b & 0xE0) == 0xE0);
+                //validate!((b & 0xE0) == 0xE0);
                 let num_sps = (b & 0x1F) as usize;
                 for _ in 0..num_sps {
                     let len             = br.read_u16be()? as usize;
diff --git a/nihav-itu/src/codecs/h264/decoder_st.rs b/nihav-itu/src/codecs/h264/decoder_st.rs
index e9983ec..c82d62e 100644
--- a/nihav-itu/src/codecs/h264/decoder_st.rs
+++ b/nihav-itu/src/codecs/h264/decoder_st.rs
@@ -737,10 +737,10 @@ impl NADecoder for H264Decoder {
                 let _compatibility      = br.read_byte()?;
                 let _level              = br.read_byte()?;
                 let b                   = br.read_byte()?;
-                validate!((b & 0xFC) == 0xFC);
+                //validate!((b & 0xFC) == 0xFC);
                 self.nal_len            = (b & 3) + 1;
                 let b                   = br.read_byte()?;
-                validate!((b & 0xE0) == 0xE0);
+                //validate!((b & 0xE0) == 0xE0);
                 let num_sps = (b & 0x1F) as usize;
                 for _ in 0..num_sps {
                     let len             = br.read_u16be()? as usize;