From 0380a03f1f9d55e5690bb92bfa4897f2c728c1e5 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Sun, 12 May 2024 17:36:10 -0300
Subject: [PATCH] avcodec/flacdsp: split off lpc33 into a dsp function

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/flacdec.c |  7 +------
 libavcodec/flacdsp.c | 15 +++++++++++++++
 libavcodec/flacdsp.h |  2 ++
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/libavcodec/flacdec.c b/libavcodec/flacdec.c
index 6e6a2896b4..460d3bc01e 100644
--- a/libavcodec/flacdec.c
+++ b/libavcodec/flacdec.c
@@ -509,12 +509,7 @@ static int decode_subframe_lpc_33bps(FLACContext *s, int64_t *decoded,
     if ((ret = decode_residuals(s, residual, pred_order)) < 0)
         return ret;
 
-    for (i = pred_order; i < s->blocksize; i++, decoded++) {
-        int64_t sum = 0;
-        for (j = 0; j < pred_order; j++)
-            sum += (int64_t)coeffs[j] * (uint64_t)decoded[j];
-        decoded[j] = residual[i] + (sum >> qlevel);
-    }
+    s->dsp.lpc33(decoded, residual, coeffs, pred_order, qlevel, s->blocksize);
 
     return 0;
 }
diff --git a/libavcodec/flacdsp.c b/libavcodec/flacdsp.c
index 27d3e923ee..f5362bf66f 100644
--- a/libavcodec/flacdsp.c
+++ b/libavcodec/flacdsp.c
@@ -84,6 +84,20 @@ static void flac_lpc_32_c(int32_t *decoded, const int coeffs[32],
 
 }
 
+static void flac_lpc_33_c(int64_t *decoded, const int32_t *residual,
+                          const int coeffs[32], int pred_order,
+                          int qlevel, int len)
+{
+    int i, j;
+
+    for (i = pred_order; i < len; i++, decoded++) {
+        int64_t sum = 0;
+        for (j = 0; j < pred_order; j++)
+            sum += (int64_t)coeffs[j] * (uint64_t)decoded[j];
+        decoded[j] = residual[i] + (sum >> qlevel);
+    }
+}
+
 static void flac_wasted_32_c(int32_t *decoded, int wasted, int len)
 {
     for (int i = 0; i < len; i++)
@@ -101,6 +115,7 @@ av_cold void ff_flacdsp_init(FLACDSPContext *c, enum AVSampleFormat fmt, int cha
 {
     c->lpc16        = flac_lpc_16_c;
     c->lpc32        = flac_lpc_32_c;
+    c->lpc33        = flac_lpc_33_c;
 
     c->wasted32     = flac_wasted_32_c;
     c->wasted33     = flac_wasted_33_c;
diff --git a/libavcodec/flacdsp.h b/libavcodec/flacdsp.h
index 5a59c0c864..3b7b35a112 100644
--- a/libavcodec/flacdsp.h
+++ b/libavcodec/flacdsp.h
@@ -30,6 +30,8 @@ typedef struct FLACDSPContext {
                   int qlevel, int len);
     void (*lpc32)(int32_t *samples, const int coeffs[32], int order,
                   int qlevel, int len);
+    void (*lpc33)(int64_t *samples, const int32_t *residual, const int coeffs[32],
+                  int pred_order, int qlevel, int len);
     void (*wasted32)(int32_t *decoded, int wasted, int len);
     void (*wasted33)(int64_t *decoded, const int32_t *residual,
                      int wasted, int len);