[FFmpeg-cvslog] avcodec/hevcdec: Constify src pointers of HEVC DSP functions

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Tue Jul 26 00:08:35 2022 +0200| [7e8c8cc04b1cde346fb31d2cae70dda0385fa51b] | committer: Andreas Rheinhardt

avcodec/hevcdec: Constify src pointers of HEVC DSP functions

This is possible now that the HEVC DSP API treats them as const.
Also constify the AVFrames whose data is used as source in such
cases.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7e8c8cc04b1cde346fb31d2cae70dda0385fa51b
---

 libavcodec/hevcdec.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index 539b656c65..f1be8af2cd 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -1201,7 +1201,7 @@ static int hls_transform_unit(HEVCLocalContext *lc, int x0, int y0,
                         ptrdiff_t stride = s->frame->linesize[1];
                         int hshift = s->ps.sps->hshift[1];
                         int vshift = s->ps.sps->vshift[1];
-                        int16_t *coeffs_y = (int16_t*)lc->edge_emu_buffer;
+                        const int16_t *coeffs_y = (int16_t*)lc->edge_emu_buffer;
                         int16_t *coeffs   = (int16_t*)lc->edge_emu_buffer2;
                         int size = 1 << log2_trafo_size_c;
 
@@ -1231,7 +1231,7 @@ static int hls_transform_unit(HEVCLocalContext *lc, int x0, int y0,
                         ptrdiff_t stride = s->frame->linesize[2];
                         int hshift = s->ps.sps->hshift[2];
                         int vshift = s->ps.sps->vshift[2];
-                        int16_t *coeffs_y = (int16_t*)lc->edge_emu_buffer;
+                        const int16_t *coeffs_y = (int16_t*)lc->edge_emu_buffer;
                         int16_t *coeffs   = (int16_t*)lc->edge_emu_buffer2;
                         int size = 1 << log2_trafo_size_c;
 
@@ -1495,11 +1495,11 @@ static int hls_pcm_sample(HEVCLocalContext *lc, int x0, int y0, int log2_cb_size
  */
 
 static void luma_mc_uni(HEVCLocalContext *lc, uint8_t *dst, ptrdiff_t dststride,
-                        AVFrame *ref, const Mv *mv, int x_off, int y_off,
+                        const AVFrame *ref, const Mv *mv, int x_off, int y_off,
                         int block_w, int block_h, int luma_weight, int luma_offset)
 {
     const HEVCContext *const s = lc->parent;
-    uint8_t *src         = ref->data[0];
+    const uint8_t *src   = ref->data[0];
     ptrdiff_t srcstride  = ref->linesize[0];
     int pic_width        = s->ps.sps->width;
     int pic_height       = s->ps.sps->height;
@@ -1556,8 +1556,9 @@ static void luma_mc_uni(HEVCLocalContext *lc, uint8_t *dst, ptrdiff_t dststride,
  * @param current_mv current motion vector structure
  */
  static void luma_mc_bi(HEVCLocalContext *lc, uint8_t *dst, ptrdiff_t dststride,
-                       AVFrame *ref0, const Mv *mv0, int x_off, int y_off,
-                       int block_w, int block_h, AVFrame *ref1, const Mv *mv1, struct MvField *current_mv)
+                        const AVFrame *ref0, const Mv *mv0, int x_off, int y_off,
+                        int block_w, int block_h, const AVFrame *ref1,
+                        const Mv *mv1, struct MvField *current_mv)
 {
     const HEVCContext *const s = lc->parent;
     ptrdiff_t src0stride  = ref0->linesize[0];
@@ -1576,8 +1577,8 @@ static void luma_mc_uni(HEVCLocalContext *lc, uint8_t *dst, ptrdiff_t dststride,
     int y_off1           = y_off + (mv1->y >> 2);
     int idx              = hevc_pel_weight[block_w];
 
-    uint8_t *src0  = ref0->data[0] + y_off0 * src0stride + (int)((unsigned)x_off0 << s->ps.sps->pixel_shift);
-    uint8_t *src1  = ref1->data[0] + y_off1 * src1stride + (int)((unsigned)x_off1 << s->ps.sps->pixel_shift);
+    const uint8_t *src0  = ref0->data[0] + y_off0 * src0stride + (int)((unsigned)x_off0 << s->ps.sps->pixel_shift);
+    const uint8_t *src1  = ref1->data[0] + y_off1 * src1stride + (int)((unsigned)x_off1 << s->ps.sps->pixel_shift);
 
     if (x_off0 < QPEL_EXTRA_BEFORE || y_off0 < QPEL_EXTRA_AFTER ||
         x_off0 >= pic_width - block_w - QPEL_EXTRA_AFTER ||
@@ -1647,7 +1648,7 @@ static void luma_mc_uni(HEVCLocalContext *lc, uint8_t *dst, ptrdiff_t dststride,
  */
 
 static void chroma_mc_uni(HEVCLocalContext *lc, uint8_t *dst0,
-                          ptrdiff_t dststride, uint8_t *src0, ptrdiff_t srcstride, int reflist,
+                          ptrdiff_t dststride, const uint8_t *src0, ptrdiff_t srcstride, int reflist,
                           int x_off, int y_off, int block_w, int block_h,
                           const struct MvField *current_mv, int chroma_weight, int chroma_offset)
 {
@@ -1712,12 +1713,13 @@ static void chroma_mc_uni(HEVCLocalContext *lc, uint8_t *dst0,
  * @param current_mv current motion vector structure
  * @param cidx chroma component(cb, cr)
  */
-static void chroma_mc_bi(HEVCLocalContext *lc, uint8_t *dst0, ptrdiff_t dststride, AVFrame *ref0, AVFrame *ref1,
+static void chroma_mc_bi(HEVCLocalContext *lc, uint8_t *dst0, ptrdiff_t dststride,
+                         const AVFrame *ref0, const AVFrame *ref1,
                          int x_off, int y_off, int block_w, int block_h, const MvField *current_mv, int cidx)
 {
     const HEVCContext *const s = lc->parent;
-    uint8_t *src1        = ref0->data[cidx+1];
-    uint8_t *src2        = ref1->data[cidx+1];
+    const uint8_t *src1  = ref0->data[cidx+1];
+    const uint8_t *src2  = ref1->data[cidx+1];
     ptrdiff_t src1stride = ref0->linesize[cidx+1];
     ptrdiff_t src2stride = ref1->linesize[cidx+1];
     int weight_flag      = (s->sh.slice_type == HEVC_SLICE_P && s->ps.pps->weighted_pred_flag) ||