From patchwork Tue Oct 6 00:17:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul B Mahol X-Patchwork-Id: 22733 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id 051C244AFB4 for ; Tue, 6 Oct 2020 03:45:47 +0300 (EEST) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id D622968B4FA; Tue, 6 Oct 2020 03:45:46 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-ej1-f66.google.com (mail-ej1-f66.google.com [209.85.218.66]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 2A0256880CA for ; Tue, 6 Oct 2020 03:45:40 +0300 (EEST) Received: by mail-ej1-f66.google.com with SMTP id ly6so13622436ejb.8 for ; Mon, 05 Oct 2020 17:45:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references; bh=tSx3NaWBugiWH0vNshnPN0ogttOXydpAht5PG3TJtr8=; b=kHz+AIVzQNaZ8lTwbw3zNwrUD00T6ThG7JHPnZ3Ti8ryfw2Cluc45dBwRQMmuk3378 HJlVT+cuS6jaXenjPj+KLzooEB5FC303UOjjzpEbWCg5dTXs/Hjo+zwbFyijuCWNAsHL 0QGRQ1NP+e/zyqSXMM+HPRRhODraN8L5Y54Y91UP1N6SHcJrjWKve/YrUZ9D432/9C54 UWhyfdsmp35sjsKmoRA5B1AeyoQC2+so7PCz9xcIhWSj69sX66inJq7t+pV4ekE3XWsF DVApqQ2l03JMGzNkxguNAs2Q3VSwZ1SECJSZOnx+/6mIe5blw3UEeD3VPqNwbc56DBXD KC5Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references; bh=tSx3NaWBugiWH0vNshnPN0ogttOXydpAht5PG3TJtr8=; b=OeSLeKGn7zCxG0hehVQaXAj/nvdqrbgIUDXO+m75tMTHZpJSe1KVPnaLnAHkqCl6bo fQqgynw9P6H4hfnxRERbOjX7Ihl1GWOXnfuDXZeBBIsE4Yk/SmqIGz26eUHQmx87yq9M Ym1vbtkv3AJax8wJ+1dWeCB+ApVaEFFYktA23CupBJ+W5iD6lnTpR77hhISas7Nn8zLV 3ubCiIpreUXXaPUiiyB/uf9G7Ik5A0cvMmDrw89TbB4HtLCboBKang/GrncdGBFxagkh WYLAorILXppPS3t32Q4B5n6z+6CepkN94Sm2c6ng3byDNDjBS84sJEI11i+Jqj+WL2M0 g5ig== X-Gm-Message-State: AOAM533AEd4BBzLM4Akk9eKvOK4sacrC4DpC+xBPtdyC5yw+C7V6hDWt JIoLeozkAFnveRrdz9Lg2kJ+3kz3hZsx8w== X-Google-Smtp-Source: ABdhPJywKwdatP7vKpJydN8tJCsWvA0ssSr/mlQ/BRctEud1gaO4wn4Q2UTjNzv0mEjVxYconPUjkw== X-Received: by 2002:a05:6402:31b3:: with SMTP id dj19mr389275edb.210.1601943450955; Mon, 05 Oct 2020 17:17:30 -0700 (PDT) Received: from localhost.localdomain ([109.227.55.37]) by smtp.gmail.com with ESMTPSA id q12sm1017137edj.19.2020.10.05.17.17.29 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Oct 2020 17:17:29 -0700 (PDT) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Tue, 6 Oct 2020 02:17:14 +0200 Message-Id: <20201006001714.19577-4-onemda@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201006001714.19577-1-onemda@gmail.com> References: <20201006001714.19577-1-onemda@gmail.com> Subject: [FFmpeg-devel] [PATCH 4/4] avcodec/apedec: use ff_clz() instead of while loop X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 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 MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Signed-off-by: Paul B Mahol --- libavcodec/apedec.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c index 8fe7b5ee86..ea36247eb9 100644 --- a/libavcodec/apedec.c +++ b/libavcodec/apedec.c @@ -575,14 +575,10 @@ static inline int ape_decode_value_3990(APEContext *ctx, APERice *rice) base = range_decode_culfreq(ctx, pivot); range_decode_update(ctx, 1, base); } else { - int base_hi = pivot, base_lo; - int bbits = 0; + int base_hi, base_lo; + int bbits = 16 - ff_clz(pivot); - while (base_hi & ~0xFFFF) { - base_hi >>= 1; - bbits++; - } - base_hi = range_decode_culfreq(ctx, base_hi + 1); + base_hi = range_decode_culfreq(ctx, (pivot >> bbits) + 1); range_decode_update(ctx, 1, base_hi); base_lo = range_decode_culfreq(ctx, 1 << bbits); range_decode_update(ctx, 1, base_lo);