[FFmpeg-devel] [PATCH] avcodec/hevc_ps: use get_ue_golomb() for some PPS Screen Content Coding extension fields

[James Almer <jamrial@gmail.com>]

Also remove the _minus8 part of the name to be in line with the rest of the
decoder, and fix the storage type for pps_palette_predictor_initializer,
to support hbd values.

Signed-off-by: James Almer <jamrial@gmail.com>
---
 libavcodec/hevc_ps.c | 21 ++++++++++++++-------
 libavcodec/hevc_ps.h |  6 +++---
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index f29f783f77..289b8f7d95 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -1538,17 +1538,24 @@ static int pps_scc_extension(GetBitContext *gb, AVCodecContext *avctx,
     }
 
     if (pps->pps_palette_predictor_initializers_present_flag = get_bits1(gb)) {
-        if ((pps->pps_num_palette_predictor_initializers = get_ue_golomb_long(gb)) > 0) {
+        pps->pps_num_palette_predictor_initializers = get_ue_golomb(gb);
+        if (pps->pps_num_palette_predictor_initializers > 0) {
+            if (pps->pps_num_palette_predictor_initializers > HEVC_MAX_PALETTE_PREDICTOR_SIZE) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "pps_num_palette_predictor_initializers out of range: %u\n",
+                       pps->pps_num_palette_predictor_initializers);
+                return AVERROR_INVALIDDATA;
+            }
             pps->monochrome_palette_flag = get_bits1(gb);
-            pps->luma_bit_depth_entry_minus8 = get_ue_golomb_long(gb);
+            pps->luma_bit_depth_entry = get_ue_golomb_31(gb) + 8;
             if (!pps->monochrome_palette_flag)
-                pps->chroma_bit_depth_entry_minus8 = get_ue_golomb_long(gb);
+                pps->chroma_bit_depth_entry = get_ue_golomb_31(gb) + 8;
             num_comps = pps->monochrome_palette_flag ? 1 : 3;
-            for (int comp = 0; comp < num_comps; comp++)
+            for (int comp = 0; comp < num_comps; comp++) {
+                int bit_depth = !comp ? pps->luma_bit_depth_entry : pps->chroma_bit_depth_entry;
                 for (int i = 0; i < pps->pps_num_palette_predictor_initializers; i++)
-                    pps->pps_palette_predictor_initializer[comp][i] =
-                        get_bits(gb, 8 + (!comp ? pps->luma_bit_depth_entry_minus8 :
-                                          pps->chroma_bit_depth_entry_minus8));
+                    pps->pps_palette_predictor_initializer[comp][i] = get_bits(gb, bit_depth);
+            }
         }
     }
 
diff --git a/libavcodec/hevc_ps.h b/libavcodec/hevc_ps.h
index 0c9c278662..8cd99bb161 100644
--- a/libavcodec/hevc_ps.h
+++ b/libavcodec/hevc_ps.h
@@ -358,9 +358,9 @@ typedef struct HEVCPPS {
     uint8_t pps_palette_predictor_initializers_present_flag;
     uint8_t pps_num_palette_predictor_initializers;
     uint8_t monochrome_palette_flag;
-    uint8_t luma_bit_depth_entry_minus8;
-    uint8_t chroma_bit_depth_entry_minus8;
-    uint8_t pps_palette_predictor_initializer[3][HEVC_MAX_PALETTE_PREDICTOR_SIZE];
+    uint8_t luma_bit_depth_entry;
+    uint8_t chroma_bit_depth_entry;
+    uint16_t pps_palette_predictor_initializer[3][HEVC_MAX_PALETTE_PREDICTOR_SIZE];
 
     // Inferred parameters
     unsigned int *column_width;  ///< ColumnWidth
-- 
2.40.1

_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel

To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".