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[68.41.54.207]) by smtp.gmail.com with ESMTPSA id q5-20020a02a305000000b0035678e2e175sm3549891jai.50.2023.01.31.21.41.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Jan 2023 21:41:45 -0800 (PST) From: Leo Izen To: ffmpeg-devel@ffmpeg.org Date: Wed, 1 Feb 2023 00:41:29 -0500 Message-Id: <20230201054129.124226-3-leo.izen@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230201054129.124226-1-leo.izen@gmail.com> References: <20230201054129.124226-1-leo.izen@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 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 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: yZQwo57PsUC5 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 | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/libavcodec/pngenc.c b/libavcodec/pngenc.c index 2393161c3b..0961125f0a 100644 --- a/libavcodec/pngenc.c +++ b/libavcodec/pngenc.c @@ -432,6 +432,13 @@ 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) { + size_t len = s->color_type == 0 ? 1 : s->color_type == 2 || s->color_type == 3 ? 3 : + s->color_type == 4 ? 2 : 4; + memset(s->buf, avctx->bits_per_raw_sample, len); + png_write_chunk(&s->bytestream, MKTAG('s', 'B', 'I', 'T'), s->buf, len); + } + side_data = av_frame_get_side_data(pict, AV_FRAME_DATA_ICC_PROFILE); if ((ret = png_write_iccp(s, side_data))) return ret;