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| author | Leo Izen <leo.izen@gmail.com> | 2023-03-21 23:26:26 -0400 |
|---|---|---|
| committer | Leo Izen <leo.izen@gmail.com> | 2023-04-01 00:37:55 -0400 |
| commit | c125860892e931d9b10f88ace73c91484815c3a8 (patch) | |
| tree | f6e4941ee42a4009d43ee8aed46c96348b160b8c /libavcodec/pngenc.c | |
| parent | 84b454935fae2633a8a5dd075e22393f3e8f932f (diff) | |
| download | ffmpeg-c125860892e931d9b10f88ace73c91484815c3a8.tar.gz | |
avcodec/pngenc: write sBIT chunks
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 <leo.izen@gmail.com>
Diffstat (limited to 'libavcodec/pngenc.c')
| -rw-r--r-- | libavcodec/pngenc.c | 6 |
1 files changed, 6 insertions, 0 deletions
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; |