diff options
Diffstat (limited to 'libavcore/imgutils.c')
| -rw-r--r-- | libavcore/imgutils.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libavcore/imgutils.c b/libavcore/imgutils.c index f3d75eecb2..84db01ae77 100644 --- a/libavcore/imgutils.c +++ b/libavcore/imgutils.c @@ -24,6 +24,30 @@ #include "imgutils.h" #include "libavutil/pixdesc.h" +int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane) +{ + const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; + int max_step [4]; /* max pixel step for each plane */ + int max_step_comp[4]; /* the component for each plane which has the max pixel step */ + int s, i; + + if (desc->flags & PIX_FMT_BITSTREAM) + return (width * (desc->comp[0].step_minus1+1) + 7) >> 3; + + memset(max_step , 0, sizeof(max_step )); + memset(max_step_comp, 0, sizeof(max_step_comp)); + for (i = 0; i < 4; i++) { + const AVComponentDescriptor *comp = &(desc->comp[i]); + if ((comp->step_minus1+1) > max_step[comp->plane]) { + max_step [comp->plane] = comp->step_minus1+1; + max_step_comp[comp->plane] = i; + } + } + + s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0; + return max_step[plane] * (((width + (1 << s) - 1)) >> s); +} + int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width) { int i; |