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screenshots: write jpg files with original subsampling

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A screenshot from a 4:2:0 video will use 4:2:0, RGB will use 4:4:4, and
so on. (The image data still goes through RGB conversion always.)
This commit is contained in:
wm4 2015-04-09 21:01:34 +02:00
parent 13a0ff8cb7
commit 8d3c826ad8
1 changed files with 5 additions and 1 deletions
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6
video/image_writer.c
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@ -77,6 +77,7 @@ struct image_writer_ctx {
struct mp_log *log;
const struct image_writer_opts *opts;
const struct img_writer *writer;
struct mp_imgfmt_desc original_format;
};
struct img_writer {
@ -200,6 +201,9 @@ static int write_jpeg(struct image_writer_ctx *ctx, mp_image_t *image, FILE *fp)
cinfo.optimize_coding = ctx->opts->jpeg_optimize;
cinfo.smoothing_factor = ctx->opts->jpeg_smooth;
cinfo.comp_info[0].h_samp_factor = 1 << ctx->original_format.chroma_xs;
cinfo.comp_info[0].v_samp_factor = 1 << ctx->original_format.chroma_ys;
if (ctx->opts->jpeg_progressive)
jpeg_simple_progression(&cinfo);
@ -299,7 +303,7 @@ int write_image(struct mp_image *image, const struct image_writer_opts *opts,
opts = &defs;
const struct img_writer *writer = get_writer(opts);
struct image_writer_ctx ctx = { log, opts, writer };
struct image_writer_ctx ctx = { log, opts, writer, image->fmt };
int destfmt = get_target_format(&ctx, image->imgfmt);
// Caveat: no colorspace/levels conversion done if pixel formats equal