From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 84BE14347A for ; Sun, 14 Aug 2022 16:49:07 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id DEADF68B926; Sun, 14 Aug 2022 19:48:54 +0300 (EEST) Received: from btbn.de (btbn.de [136.243.74.85]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id AFBCD68B7AD for ; Sun, 14 Aug 2022 19:48:46 +0300 (EEST) Received: from [authenticated] by btbn.de (Postfix) with ESMTPSA id 3CE192AEB84; Sun, 14 Aug 2022 18:48:46 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rothenpieler.org; s=mail; t=1660495726; bh=H2csBUjFdQ2Aipfsh/Ovz+x8Wry9D0rysCl51yVY7JY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KyI2RjbDedP2m/12LACOvM1QzDWxfQcTmhUUWjUnTdlbaxzwC+oO5RquIgmgi2szB 74IqruxdW8TWLUIvz6TS+dcIQYMKB0fD1Sx0I3BREUcaI5yMad86c+HrXQXsZ4yLz9 VjJ11wejvIMYsn7nX70scpivN0kudAiReRAshHP9FkYwKbZZEDNvlLRObjI01aWHb+ YLGPEQULsjW2LIL/fZZJuthbXmD44t+w/FmQPh4+26IUm3ncODLpjEyASTgsDuBIFV Gcr5RzYthy4IiN1/Wce0ADPJmSkL38dAn8Ml53CI4NiRN5PqTXjszVWEZwxwwQDleY E5cClXJ0WkfWQ== From: Timo Rothenpieler To: ffmpeg-devel@ffmpeg.org Date: Sun, 14 Aug 2022 18:48:28 +0200 Message-Id: <20220814164833.19965-2-timo@rothenpieler.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220814164833.19965-1-timo@rothenpieler.org> References: <20220814164833.19965-1-timo@rothenpieler.org> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v2 2/7] avutil/half2float: adjust conversion of NaN 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: Timo Rothenpieler 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: IEEE-754 differentiates two different kind of NaNs. Quiet and Signaling ones. They are differentiated by the MSB of the mantissa. For whatever reason, actual hardware conversion of half to single always sets the signaling bit to 1 if the mantissa is != 0, and to 0 if it's 0. So our code has to follow suite or fate-testing hardware float16 will be impossible. --- libavcodec/exr.c | 2 +- libavcodec/pnm.h | 2 +- libavutil/half2float.h | 5 +++++ tests/ref/fate/exr-rgb-scanline-zip-half-0x0-0xFFFF | 2 +- 4 files changed, 8 insertions(+), 3 deletions(-) diff --git a/libavcodec/exr.c b/libavcodec/exr.c index 5c6ca9adbf..47f4786491 100644 --- a/libavcodec/exr.c +++ b/libavcodec/exr.c @@ -191,7 +191,7 @@ typedef struct EXRContext { float gamma; union av_intfloat32 gamma_table[65536]; - uint32_t mantissatable[2048]; + uint32_t mantissatable[3072]; uint32_t exponenttable[64]; uint16_t offsettable[64]; } EXRContext; diff --git a/libavcodec/pnm.h b/libavcodec/pnm.h index 5bf2eaa4d9..7e5445f529 100644 --- a/libavcodec/pnm.h +++ b/libavcodec/pnm.h @@ -34,7 +34,7 @@ typedef struct PNMContext { int half; float scale; - uint32_t mantissatable[2048]; + uint32_t mantissatable[3072]; uint32_t exponenttable[64]; uint16_t offsettable[64]; } PNMContext; diff --git a/libavutil/half2float.h b/libavutil/half2float.h index 1f6deade07..5af4690cfe 100644 --- a/libavutil/half2float.h +++ b/libavutil/half2float.h @@ -45,6 +45,9 @@ static void half2float_table(uint32_t *mantissatable, uint32_t *exponenttable, mantissatable[i] = convertmantissa(i); for (int i = 1024; i < 2048; i++) mantissatable[i] = 0x38000000UL + ((i - 1024) << 13UL); + for (int i = 2048; i < 3072; i++) + mantissatable[i] = mantissatable[i - 1024] | 0x400000UL; + mantissatable[2048] = mantissatable[1024]; exponenttable[0] = 0; for (int i = 1; i < 31; i++) @@ -58,7 +61,9 @@ static void half2float_table(uint32_t *mantissatable, uint32_t *exponenttable, offsettable[0] = 0; for (int i = 1; i < 64; i++) offsettable[i] = 1024; + offsettable[31] = 2048; offsettable[32] = 0; + offsettable[63] = 2048; } static uint32_t half2float(uint16_t h, const uint32_t *mantissatable, const uint32_t *exponenttable, diff --git a/tests/ref/fate/exr-rgb-scanline-zip-half-0x0-0xFFFF b/tests/ref/fate/exr-rgb-scanline-zip-half-0x0-0xFFFF index b6201116fe..e45a40b498 100644 --- a/tests/ref/fate/exr-rgb-scanline-zip-half-0x0-0xFFFF +++ b/tests/ref/fate/exr-rgb-scanline-zip-half-0x0-0xFFFF @@ -3,4 +3,4 @@ #codec_id 0: rawvideo #dimensions 0: 256x256 #sar 0: 1/1 -0, 0, 0, 1, 786432, 0x1445e411 +0, 0, 0, 1, 786432, 0xce9be2be -- 2.34.1 _______________________________________________ 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".