int av_image_get_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, linesize; if ((unsigned)pix_fmt >= PIX_FMT_NB || desc->flags & PIX_FMT_HWACCEL) return AVERROR(EINVAL); av_image_fill_max_pixsteps(max_step, max_step_comp, desc); s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0; linesize = max_step[plane] * (((width + (1 << s) - 1)) >> s); if (desc->flags & PIX_FMT_BITSTREAM) linesize = (linesize + 7) >> 3; return linesize; }