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.
2026-05-17 11:43:10 +01:00
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+/*
+ * LPC utility functions
+ * Copyright (c) 2006  Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_LPC_FUNCTIONS_H
+#define AVCODEC_LPC_FUNCTIONS_H
+
+#include "libavutil/avassert.h"
+
+#ifndef LPC_USE_FIXED
+#define LPC_USE_FIXED 0
+#endif
+
+#if LPC_USE_FIXED
+typedef int LPC_TYPE;
+typedef unsigned LPC_TYPE_U;
+#else
+#ifndef LPC_SRA_R
+#define LPC_SRA_R(x, y) (x)
+#define LPC_MUL26(x, y) ((x) * (y))
+#define LPC_FIXR(x)     ((float)(x))
+#endif
+
+#ifdef LPC_USE_DOUBLE
+typedef double LPC_TYPE;
+typedef double LPC_TYPE_U;
+#else
+typedef float LPC_TYPE;
+typedef float LPC_TYPE_U;
+#endif
+#endif // USE_FIXED
+
+/**
+ * Levinson-Durbin recursion.
+ * Produce LPC coefficients from autocorrelation data.
+ */
+static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order,
+                                    LPC_TYPE *lpc, int lpc_stride, int fail,
+                                    int normalize)
+{
+    LPC_TYPE err = 0;
+    LPC_TYPE *lpc_last = lpc;
+
+    av_assert2(normalize || !fail);
+
+    if (normalize)
+        err = *autoc++;
+
+    if (fail && (autoc[max_order - 1] == 0 || err <= 0))
+        return -1;
+
+    for(int i = 0; i < max_order; i++) {
+        LPC_TYPE r = LPC_SRA_R(-autoc[i], 5);
+
+        if (normalize) {
+            for(int j = 0; j < i; j++)
+                r -= lpc_last[j] * autoc[i-j-1];
+
+            if (err)
+                r /= err;
+            err *= LPC_FIXR(1.0) - (r * r);
+        }
+
+        lpc[i] = r;
+
+        for(int j = 0; j < (i + 1) >> 1; j++) {
+            LPC_TYPE f = lpc_last[    j];
+            LPC_TYPE b = lpc_last[i-1-j];
+            lpc[    j] = f + (LPC_TYPE_U)LPC_MUL26(r, b);
+            lpc[i-1-j] = b + (LPC_TYPE_U)LPC_MUL26(r, f);
+        }
+
+        if (fail && err < 0)
+            return -1;
+
+        lpc_last = lpc;
+        lpc += lpc_stride;
+    }
+
+    return 0;
+}
+
+#endif /* AVCODEC_LPC_FUNCTIONS_H */