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 8277044F0A for ; Wed, 8 Mar 2023 20:03:48 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id DB96D68BD58; Wed, 8 Mar 2023 22:03:28 +0200 (EET) Received: from mail-il1-f175.google.com (mail-il1-f175.google.com [209.85.166.175]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 5BD0868BC38 for ; Wed, 8 Mar 2023 22:03:21 +0200 (EET) Received: by mail-il1-f175.google.com with SMTP id i4so11194847ils.1 for ; Wed, 08 Mar 2023 12:03:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1678305800; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wGuX2OnE6pCNrse8BjLjdzG83ezI4m5HTA+GSl8qYs4=; b=KIpAEZFDHtDS+6TK7ewyczdp0JCdw1Uu/CsMBuEFcEYI4LIbs55UgOJGvPWMaGa/eE a66f8/6PrPaaLifSvD77yGA6KcLLTvFcJIfAyfhZGKI/eqalQWGVoyHGAW/rreCaKZjt i0fk9IqPAoY3p4DMefeWu4c7TKccCUhiw7iza1cR5k+w4DUEc9X8pVbUhYHk++4owE1d ao7oHh1av/r1wzZgoYL+4IGtupzJ8jmfkIOaKXaNn5WLUrm9SMDNdffP51sDbXTR7SPI uEzeG7ytNOlSt5VVNB7K/wkIhvJDbYEPfn+/5lM9gxyfVfFB7PcxpnOnMMge5U5M8/ui tGgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678305800; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wGuX2OnE6pCNrse8BjLjdzG83ezI4m5HTA+GSl8qYs4=; b=buGeLOu5zTe548ssYDvvI7NgDn1RQxad3Vk9NiCYlD8dBQF0LjGFL6CGg3JZd9hKLU P6F813ajwHahivGb85LKih+8rURm+CQDOPjrQozto3RdacmSRKNkXvvSnhxF2YbGsbs5 97FSdy6o+qMRmSc5kSU61RS42ODoLbvOAG+9s35+yVR70kc1hGNefuWz88IGOck5JXTH KoE54rBkVsAdoX6GfIaSNWWRUTJXp8HS2NeR/KARAjy9ifSjGO6g7acZFFdO2g3lpT5x LMuF18FDdbsIgLOpXgtL4wcQQSOMfhS9dPCrOXWliWgda2/cgU3HHqZqyPbAXFaGkbNg 4Uxw== X-Gm-Message-State: AO0yUKVnpsEe8HTz5EzzToGin2XbNzTc0LyawdpRIudXuQilckuFb/AH lAlXBTlijoTWyZA+bomlrl1l5rCQ5SPHew== X-Google-Smtp-Source: AK7set+VFy/rsy9Kz6AeW6IfjgTJAm3yMbUTedNMqB4+YWPgUQhTMlsY1Z2yaOBSF2GFBS8K1mAnLg== X-Received: by 2002:a05:6e02:1522:b0:319:5431:5d5b with SMTP id i2-20020a056e02152200b0031954315d5bmr13904772ilu.1.1678305799910; Wed, 08 Mar 2023 12:03:19 -0800 (PST) Received: from gauss.local (c-98-224-219-15.hsd1.mi.comcast.net. [98.224.219.15]) by smtp.gmail.com with ESMTPSA id h2-20020a02cd22000000b003c4f96913c1sm5374817jaq.105.2023.03.08.12.03.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Mar 2023 12:03:19 -0800 (PST) From: Leo Izen To: ffmpeg-devel@ffmpeg.org Date: Wed, 8 Mar 2023 15:03:16 -0500 Message-Id: <20230308200316.45476-3-leo.izen@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230308200316.45476-1-leo.izen@gmail.com> References: <20230308200316.45476-1-leo.izen@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v2 2/2] avcodec/pngenc: write sBIT chunks 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: Leo Izen 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: Add support for writing sBIT chunks, which mark the significant bit depth of the PNG file. This obtains the metadata using the field bits_per_raw_sample of AVCodecContext. Signed-off-by: Leo Izen --- libavcodec/pngenc.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c index 1489256d00..21b033ea16 100644 --- a/libavcodec/pngenc.c +++ b/libavcodec/pngenc.c @@ -442,6 +442,12 @@ static int encode_headers(AVCodecContext *avctx, const AVFrame *pict) if (png_get_gama(pict->color_trc, s->buf)) png_write_chunk(&s->bytestream, MKTAG('g', 'A', 'M', 'A'), s->buf, 4); + if (avctx->bits_per_raw_sample > 0 && avctx->bits_per_raw_sample < s->bit_depth) { + int len = ff_png_get_nb_channels(s->color_type); + memset(s->buf, avctx->bits_per_raw_sample, len); + png_write_chunk(&s->bytestream, MKTAG('s', 'B', 'I', 'T'), s->buf, len); + } + /* put the palette if needed, must be after colorspace information */ if (s->color_type == PNG_COLOR_TYPE_PALETTE) { int has_alpha, alpha, i; -- 2.39.2 _______________________________________________ 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".