[FFmpeg-devel] [PATCH 1/2] avcodec/hevcdec: fix stat_coeff save/load for persistent_rice_adaptation_enabled_flag

[Xu Guangxin]

It's required by 9.3.1. following clips have this feature:

WPP_HIGH_TP_444_8BIT_RExt_Apple_2.bit
Bitdepth_A_RExt_Sony_1.bin
Bitdepth_B_RExt_Sony_1.bin
EXTPREC_HIGHTHROUGHPUT_444_16_INTRA_10BIT_RExt_Sony_1.bit
EXTPREC_HIGHTHROUGHPUT_444_16_INTRA_12BIT_RExt_Sony_1.bit
EXTPREC_HIGHTHROUGHPUT_444_16_INTRA_8BIT_RExt_Sony_1.bit
EXTPREC_MAIN_444_16_INTRA_10BIT_RExt_Sony_1.bit
EXTPREC_MAIN_444_16_INTRA_12BIT_RExt_Sony_1.bit
EXTPREC_MAIN_444_16_INTRA_8BIT_RExt_Sony_1.bit
WPP_AND_TILE_10Bit422Test_HIGH_TP_444_10BIT_RExt_Apple_2.bit
WPP_AND_TILE_AND_CABAC_BYPASS_ALIGN_0_HIGH_TP_444_14BIT_RExt_Apple_2.bit
WPP_AND_TILE_AND_CABAC_BYPASS_ALIGN_1_HIGH_TP_444_14BIT_RExt_Apple_2.bit
WPP_AND_TILE_HIGH_TP_444_8BIT_RExt_Apple_2.bit

you can download them from:
https://www.itu.int/wftp3/av-arch/jctvc-site/bitstream_exchange/draft_conformance/RExt/

Signed-off-by: Xu Guangxin <oddstone at gmail.com>
---
 libavcodec/hevc_cabac.c | 6 ++++++
 libavcodec/hevcdec.h    | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/libavcodec/hevc_cabac.c b/libavcodec/hevc_cabac.c
index 3dc0987dad..635b4edef3 100644
--- a/libavcodec/hevc_cabac.c
+++ b/libavcodec/hevc_cabac.c
@@ -454,12 +454,18 @@ void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts)
          (s->ps.sps->ctb_width == 2 &&
           ctb_addr_ts % s->ps.sps->ctb_width == 0))) {
         memcpy(s->cabac_state, s->HEVClc->cabac_state, HEVC_CONTEXTS);
+        if (s->ps.sps->persistent_rice_adaptation_enabled_flag) {
+            memcpy(s->stat_coeff, s->HEVClc->stat_coeff, HEVC_STAT_COEFFS);
+        }
     }
 }
 
 static void load_states(HEVCContext *s)
 {
     memcpy(s->HEVClc->cabac_state, s->cabac_state, HEVC_CONTEXTS);
+    if (s->ps.sps->persistent_rice_adaptation_enabled_flag) {
+        memcpy(s->HEVClc->stat_coeff, s->stat_coeff, HEVC_STAT_COEFFS);
+    }
 }
 
 static int cabac_reinit(HEVCLocalContext *lc)
diff --git a/libavcodec/hevcdec.h b/libavcodec/hevcdec.h
index 39c5c7f89f..d41aed4556 100644
--- a/libavcodec/hevcdec.h
+++ b/libavcodec/hevcdec.h
@@ -53,6 +53,7 @@
 #define DEFAULT_INTRA_TC_OFFSET 2
 
 #define HEVC_CONTEXTS 199
+#define HEVC_STAT_COEFFS 4
 
 #define MRG_MAX_NUM_CANDS     5
 
@@ -424,7 +425,7 @@ typedef struct HEVCFrame {
 typedef struct HEVCLocalContext {
     uint8_t cabac_state[HEVC_CONTEXTS];
 
-    uint8_t stat_coeff[4];
+    uint8_t stat_coeff[HEVC_STAT_COEFFS];
 
     uint8_t first_qp_group;
 
@@ -480,6 +481,7 @@ typedef struct HEVCContext {
     int                 height;
 
     uint8_t *cabac_state;
+    uint8_t stat_coeff[HEVC_STAT_COEFFS];
 
     /** 1 if the independent slice segment header was successfully parsed */
     uint8_t slice_initialized;
-- 
2.17.1