Bump AVM to research-8.1.0 (#2506)

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 487f641..e9ea1ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,7 +28,7 @@
   decoder->image->gainMap != NULL instead.
 * Write an empty HandlerBox name field instead of "libavif" (saves 7 bytes).
 * Update aom.cmd/LocalAom.cmake: v3.11.0
-* Update avm.cmd: research-v8.0.0
+* Update avm.cmd: research-v8.1.0
 * Update dav1d.cmd/dav1d_android.sh/LocalDav1d.cmake: 1.5.0
 * Update libjpeg.cmd/LocalJpeg.cmake: v3.0.4
 * Update libxml2.cmd/LocalLibXml2.cmake: v2.13.4

cmake/Modules/LocalAom.cmake

diff --git a/cmake/Modules/LocalAom.cmake b/cmake/Modules/LocalAom.cmake
index c375f9d..44548ed 100644
--- a/cmake/Modules/LocalAom.cmake
+++ b/cmake/Modules/LocalAom.cmake
@@ -1,5 +1,5 @@
 set(AVIF_LOCAL_AOM_GIT_TAG v3.11.0)
-set(AVIF_LOCAL_AVM_GIT_TAG research-v8.0.0)
+set(AVIF_LOCAL_AVM_GIT_TAG research-v8.1.0)
 
 if(AVIF_CODEC_AVM)
     # Building the avm repository generates files such as "libaom.a" because it is a fork of aom,

ext/avm.cmd

diff --git a/ext/avm.cmd b/ext/avm.cmd
index 976a0ad..7ed0076 100755
--- a/ext/avm.cmd
+++ b/ext/avm.cmd
@@ -8,7 +8,7 @@
 : # If you're running this on Windows, be sure you've already run this (from your VC2019 install dir):
 : #     "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvars64.bat"
 
-git clone -b research-v8.0.0 --depth 1 https://gitlab.com/AOMediaCodec/avm.git
+git clone -b research-v8.1.0 --depth 1 https://gitlab.com/AOMediaCodec/avm.git
 
 cd avm
 

src/codec_avm.c

diff --git a/src/codec_avm.c b/src/codec_avm.c
index 698b062..2c67aea 100644
--- a/src/codec_avm.c
+++ b/src/codec_avm.c
@@ -145,7 +145,8 @@
                 return AVIF_FALSE;
         }
         if (codec->internal->image->monochrome) {
-            // avm does not handle monochrome as of research-v8.0.0.
+            // avm does not handle monochrome as of research-v8.1.0.
+            // https://gitlab.com/AOMediaCodec/avm/-/issues/522
             // This should not happen.
             yuvFormat = AVIF_PIXEL_FORMAT_YUV400;
         }
@@ -658,7 +659,8 @@
             cfg->g_threads = AVIF_MIN(encoder->maxThreads, 64);
         }
 
-        // avm does not handle monochrome as of research-v8.0.0.
+        // avm does not handle monochrome as of research-v8.1.0.
+        // https://gitlab.com/AOMediaCodec/avm/-/issues/522
         // TODO(yguyon): Enable when fixed upstream
         codec->internal->monochromeEnabled = AVIF_FALSE;
 

src/obu.c

diff --git a/src/obu.c b/src/obu.c
index c7a2151..a6e341b 100644
--- a/src/obu.c
+++ b/src/obu.c
@@ -372,7 +372,6 @@
 // See https://gitlab.com/AOMediaCodec/avm/-/blob/main/av1/decoder/decodeframe.c
 static avifBool parseAV2SequenceHeader(avifBits * bits, avifSequenceHeader * header)
 {
-#if defined(AVIF_ENABLE_CWG_E103)
     // See read_sequence_header_obu() in avm.
     AVIF_CHECK(parseSequenceHeaderProfile(bits, header));
 
@@ -387,34 +386,6 @@
     // See read_sequence_header_obu() in avm.
     AVIF_CHECK(parseSequenceHeaderLevelIdxAndTier(bits, header));
 
-    return !bits->error;
-#else  // !defined(AVIF_ENABLE_CWG_E103)
-    // See read_sequence_header_obu() in avm.
-    AVIF_CHECK(parseSequenceHeaderProfile(bits, header));
-    AVIF_CHECK(parseSequenceHeaderLevelIdxAndTier(bits, header));
-
-    // See av1_read_sequence_header() in avm.
-    AVIF_CHECK(parseSequenceHeaderFrameMaxDimensions(bits, header));
-    if (!avifBitsRead(bits, 1)) // BLOCK_256X256
-        avifBitsRead(bits, 1);  // BLOCK_128X128
-    AVIF_CHECK(parseSequenceHeaderEnabledFeatures(bits, header));
-
-    avifBitsRead(bits, 2);       // enable_superres, enable_cdef
-    if (avifBitsRead(bits, 1)) { // enable_restoration
-        const int lr_tools_disable_mask_length = /*RESTORE_SWITCHABLE_TYPES=*/5 - 1;
-        avifBitsRead(bits, lr_tools_disable_mask_length); // lr_tools_disable_mask[0]
-        if (avifBitsRead(bits, 1)) {
-            avifBitsRead(bits, lr_tools_disable_mask_length - 1); // lr_tools_disable_mask[1]
-        }
-    }
-
-    // See av1_read_color_config() in avm.
-    AVIF_CHECK(parseSequenceHeaderColorConfig(bits, header));
-    // Ignored fields.
-    //   separate_uv_delta_q
-    //   base_y_dc_delta_q
-    //   base_uv_dc_delta_q
-
     // See read_sequence_header_obu() in avm.
     // Ignored field.
     //   film_grain_params_present
@@ -422,7 +393,6 @@
     // See av1_read_sequence_header_beyond_av1() in avm.
     // Other ignored fields.
     return !bits->error;
-#endif // defined(AVIF_ENABLE_CWG_E103)
 }
 #endif