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Wed, 14 May 2025 06:40:41 -0700 (PDT) Received: from localhost.localdomain ([124.79.129.75]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74237a8f7edsm9310669b3a.167.2025.05.14.06.40.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 May 2025 06:40:41 -0700 (PDT) From: toqsxw@gmail.com X-Google-Original-From: toqsxw@outlook.com To: ffmpeg-devel@ffmpeg.org Date: Wed, 14 May 2025 21:40:09 +0800 Message-ID: <20250514134031.1584-2-toqsxw@outlook.com> X-Mailer: git-send-email 2.44.0.windows.1 In-Reply-To: <20250514134031.1584-1-toqsxw@outlook.com> References: <20250514134031.1584-1-toqsxw@outlook.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v1 02/23] avcodec/vvc/cabac: add 9.3.3.7 Fixed-length binarization process X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Wu Jianhua Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: From: Wu Jianhua Signed-off-by: Wu Jianhua --- libavcodec/vvc/cabac.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-) diff --git a/libavcodec/vvc/cabac.c b/libavcodec/vvc/cabac.c index 54055ed736..9290ecd90f 100644 --- a/libavcodec/vvc/cabac.c +++ b/libavcodec/vvc/cabac.c @@ -968,6 +968,17 @@ static int limited_kth_order_egk_decode(CABACContext *c, const int k, const int return val; } +// 9.3.3.7 Fixed-length binarization process +static int fixed_length_decode(CABACContext* c, const int len) +{ + int value = 0; + + for (int i = 0; i < len; i++) + value = (value << 1) | get_cabac_bypass(c); + + return value; +} + static av_always_inline void get_left_top(const VVCLocalContext *lc, uint8_t *left, uint8_t *top, const int x0, const int y0, const uint8_t *left_ctx, const uint8_t *top_ctx) @@ -1011,11 +1022,7 @@ int ff_vvc_sao_type_idx_decode(VVCLocalContext *lc) int ff_vvc_sao_band_position_decode(VVCLocalContext *lc) { - int value = get_cabac_bypass(&lc->ep->cc); - - for (int i = 0; i < 4; i++) - value = (value << 1) | get_cabac_bypass(&lc->ep->cc); - return value; + return fixed_length_decode(&lc->ep->cc, 5); } int ff_vvc_sao_offset_abs_decode(VVCLocalContext *lc) @@ -1035,9 +1042,7 @@ int ff_vvc_sao_offset_sign_decode(VVCLocalContext *lc) int ff_vvc_sao_eo_class_decode(VVCLocalContext *lc) { - int ret = get_cabac_bypass(&lc->ep->cc) << 1; - ret |= get_cabac_bypass(&lc->ep->cc); - return ret; + return (get_cabac_bypass(&lc->ep->cc) << 1) | get_cabac_bypass(&lc->ep->cc); } int ff_vvc_alf_ctb_flag(VVCLocalContext *lc, const int rx, const int ry, const int c_idx) @@ -1479,12 +1484,7 @@ int ff_vvc_merge_idx(VVCLocalContext *lc) int ff_vvc_merge_gpm_partition_idx(VVCLocalContext *lc) { - int i = 0; - - for (int j = 0; j < 6; j++) - i = (i << 1) | get_cabac_bypass(&lc->ep->cc); - - return i; + return fixed_length_decode(&lc->ep->cc, 6); } int ff_vvc_merge_gpm_idx(VVCLocalContext *lc, const int idx) -- 2.44.0.windows.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".