FFmpeg 7.1 + cuframes input demuxer

Snapshot FFmpeg n7.1 (release tag) с применённым patch'ем для cuframes
input format. Используется как FFMPEG_REPO_OVERRIDE в NickM-27/FFmpeg-Builds
fork для статической сборки patched binary под Frigate (Debian 12 / glibc 2.36).

Apply changes:
  + libavformat/cuframesdec.c (новый — реализация демуксера)
  M libavformat/Makefile (CONFIG_CUFRAMES_DEMUXER target)
  M libavformat/allformats.c (extern declaration)
  M configure (--enable-libcuframes option + dep check)

Patch source: https://git.goldix.org/gx/cuframes (filter/ffmpeg-7.1-cuframes-demuxer.patch)

History сброшена (snapshot вместо fork) потому что upstream shallow clone
не позволял push в gitea. Полная история FFmpeg — на github.com/FFmpeg/FFmpeg n7.1.

libavcodec/msmpeg4data.h

@@ -0,0 +1,75 @@
+/*
+ * MSMPEG4 backend for encoder and decoder
+ * copyright (c) 2001 Fabrice Bellard
+ * copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * MSMPEG4 data tables.
+ */
+
+#ifndef AVCODEC_MSMPEG4DATA_H
+#define AVCODEC_MSMPEG4DATA_H
+
+#include <stdint.h>
+
+#include "libavutil/attributes_internal.h"
+
+#include "rl.h"
+#include "vlc.h"
+
+/* motion vector table */
+typedef struct MVTable {
+    const uint16_t *table_mv_code;
+    const uint8_t *table_mv_bits;
+    const uint8_t *table_mvx;
+    const uint8_t *table_mvy;
+    uint16_t *table_mv_index; /* encoding: convert mv to index in table_mv */
+    const VLCElem *vlc;       /* decoding: vlc */
+} MVTable;
+
+FF_VISIBILITY_PUSH_HIDDEN
+#define NB_RL_TABLES  6
+
+extern RLTable ff_rl_table[NB_RL_TABLES];
+
+extern uint32_t ff_v2_dc_lum_table[512][2];
+extern uint32_t ff_v2_dc_chroma_table[512][2];
+
+extern const uint8_t ff_wmv1_y_dc_scale_table[32];
+extern const uint8_t ff_wmv1_c_dc_scale_table[32];
+extern const uint8_t ff_old_ff_y_dc_scale_table[32];
+
+#define MSMPEG4_MV_TABLES_NB_ELEMS 1099
+extern MVTable ff_mv_tables[2];
+
+extern const uint8_t ff_v2_mb_type[8][2];
+extern const uint8_t ff_v2_intra_cbpc[4][2];
+
+extern const uint32_t ff_table_mb_non_intra[128][2];
+extern const uint8_t  ff_table_inter_intra[4][2];
+
+#define WMV2_INTER_CBP_TABLE_COUNT 4
+extern const uint32_t (* const ff_wmv2_inter_table[WMV2_INTER_CBP_TABLE_COUNT])[2];
+FF_VISIBILITY_POP_HIDDEN
+
+#endif /* AVCODEC_MSMPEG4DATA_H */