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[98.224.219.15]) by smtp.gmail.com with ESMTPSA id cd8-20020a0566381a0800b00406521ad090sm3710594jab.94.2023.03.21.20.26.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Mar 2023 20:26:41 -0700 (PDT) From: Leo Izen To: ffmpeg-devel@ffmpeg.org Date: Tue, 21 Mar 2023 23:26:26 -0400 Message-Id: <20230322032626.45777-3-leo.izen@gmail.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230322032626.45777-1-leo.izen@gmail.com> References: <20230322032626.45777-1-leo.izen@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v3 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: lwxf02UH/LI7 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;