[FFmpeg-cvslog] lavc/vorbisdec: use ptrdiff_t to iterate over intptr_t

[Rémi Denis-Courmont]

ffmpeg | branch: master | Rémi Denis-Courmont <remi at remlab.net> | Mon Sep 19 19:10:42 2022 +0300| [bbf045aa592f7bec895907c8878fd734a0e8713b] | committer: James Almer

lavc/vorbisdec: use ptrdiff_t to iterate over intptr_t

While this probably never overflows, we are better safe than sorry.

The callback prototype should probably also use ptrdiff_t or size_t,
but I diggress (this would affect the DSP callback prototype).

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bbf045aa592f7bec895907c8878fd734a0e8713b
---

 libavcodec/ppc/vorbisdsp_altivec.c | 4 ++--
 libavcodec/vorbisdec.c             | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/libavcodec/ppc/vorbisdsp_altivec.c b/libavcodec/ppc/vorbisdsp_altivec.c
index 4dabf2dc7d..c298d8cae3 100644
--- a/libavcodec/ppc/vorbisdsp_altivec.c
+++ b/libavcodec/ppc/vorbisdsp_altivec.c
@@ -31,12 +31,12 @@
 static void vorbis_inverse_coupling_altivec(float *mag, float *ang,
                                             intptr_t blocksize)
 {
-    int i;
     vector float m, a;
     vector bool int t0, t1;
     const vector unsigned int v_31 = //XXX
         vec_add(vec_add(vec_splat_u32(15),vec_splat_u32(15)),vec_splat_u32(1));
-    for (i = 0; i < blocksize; i += 4) {
+
+    for (ptrdiff_t i = 0; i < blocksize; i += 4) {
         m = vec_ld(0, mag+i);
         a = vec_ld(0, ang+i);
         t0 = vec_cmple(m, (vector float)vec_splat_u32(0));
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
index 38a5367be3..bfc4be6fc6 100644
--- a/libavcodec/vorbisdec.c
+++ b/libavcodec/vorbisdec.c
@@ -1581,8 +1581,7 @@ static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
 
 void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
 {
-    int i;
-    for (i = 0;  i < blocksize;  i++) {
+    for (ptrdiff_t i = 0; i < blocksize; i++) {
         if (mag[i] > 0.0) {
             if (ang[i] > 0.0) {
                 ang[i] = mag[i] - ang[i];