lavu: add FF_CEIL_RSHIFT and use it in various places.

libavcodec/ffv1dec.c

@@ -357,8 +357,8 @@ static int decode_slice(AVCodecContext *c, void *arg)
 
     av_assert1(width && height);
     if (f->colorspace == 0) {
-        const int chroma_width  = -((-width) >> f->chroma_h_shift);
-        const int chroma_height = -((-height) >> f->chroma_v_shift);
+        const int chroma_width  = FF_CEIL_RSHIFT(width,  f->chroma_h_shift);
+        const int chroma_height = FF_CEIL_RSHIFT(height, f->chroma_v_shift);
         const int cx            = x >> f->chroma_h_shift;
         const int cy            = y >> f->chroma_v_shift;
         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

libavcodec/ffv1enc.c

@@ -973,8 +973,8 @@ static int encode_slice(AVCodecContext *c, void *arg)
     }
 
     if (f->colorspace == 0) {
-        const int chroma_width  = -((-width) >> f->chroma_h_shift);
-        const int chroma_height = -((-height) >> f->chroma_v_shift);
+        const int chroma_width  = FF_CEIL_RSHIFT(width,  f->chroma_h_shift);
+        const int chroma_height = FF_CEIL_RSHIFT(height, f->chroma_v_shift);
         const int cx            = x >> f->chroma_h_shift;
         const int cy            = y >> f->chroma_v_shift;
 

libavcodec/mimic.c

@@ -388,8 +388,8 @@ static int mimic_decode_frame(AVCodecContext *avctx, void *data,
         avctx->height  = height;
         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
         for (i = 0; i < 3; i++) {
-            ctx->num_vblocks[i] = -((-height) >> (3 + !!i));
-            ctx->num_hblocks[i] =     width   >> (3 + !!i);
+            ctx->num_vblocks[i] = FF_CEIL_RSHIFT(height,   3 + !!i);
+            ctx->num_hblocks[i] =                width >> (3 + !!i);
         }
     } else if (width != ctx->avctx->width || height != ctx->avctx->height) {
         avpriv_request_sample(avctx, "Resolution changing");

libavcodec/mjpegdec.c

@@ -1847,8 +1847,8 @@ the_end:
             int w = s->width;
             int h = s->height;
             if(index && index<3){
-                w = -((-w) >> hshift);
-                h = -((-h) >> vshift);
+                w = FF_CEIL_RSHIFT(w, hshift);
+                h = FF_CEIL_RSHIFT(h, vshift);
             }
             if(dst){
                 uint8_t *dst2 = dst + s->linesize[index]*(h-1);

libavcodec/snow.c

@@ -81,8 +81,8 @@ void ff_snow_reset_contexts(SnowContext *s){ //FIXME better initial contexts
 }
 
 int ff_snow_alloc_blocks(SnowContext *s){
-    int w= -((-s->avctx->width )>>LOG2_MB_SIZE);
-    int h= -((-s->avctx->height)>>LOG2_MB_SIZE);
+    int w= FF_CEIL_RSHIFT(s->avctx->width,  LOG2_MB_SIZE);
+    int h= FF_CEIL_RSHIFT(s->avctx->height, LOG2_MB_SIZE);
 
     s->b_width = w;
     s->b_height= h;

libavcodec/utils.c

@@ -179,8 +179,8 @@ void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
 {
     s->coded_width  = width;
     s->coded_height = height;
-    s->width        = -((-width ) >> s->lowres);
-    s->height       = -((-height) >> s->lowres);
+    s->width        = FF_CEIL_RSHIFT(width,  s->lowres);
+    s->height       = FF_CEIL_RSHIFT(height, s->lowres);
 }
 
 #if (ARCH_ARM && HAVE_NEON) || ARCH_PPC || HAVE_MMX
@@ -573,8 +573,9 @@ void avpriv_color_frame(AVFrame *frame, const int c[4])
     for (p = 0; p<desc->nb_components; p++) {
         uint8_t *dst = frame->data[p];
         int is_chroma = p == 1 || p == 2;
-        int bytes = -((-frame->width) >> (is_chroma ? desc->log2_chroma_w : 0));
-        for (y = 0; y<-((-frame->height) >> (is_chroma ? desc->log2_chroma_h : 0)); y++){
+        int bytes  = is_chroma ? FF_CEIL_RSHIFT(frame->width,  desc->log2_chroma_w) : frame->width;
+        int height = is_chroma ? FF_CEIL_RSHIFT(frame->height, desc->log2_chroma_h) : frame->height;
+        for (y = 0; y < height; y++) {
             if (desc->comp[0].depth_minus1 >= 8) {
                 for (x = 0; x<bytes; x++)
                     ((uint16_t*)dst)[x] = c[p];
@@ -623,8 +624,8 @@ int ff_init_buffer_info(AVCodecContext *avctx, AVFrame *frame)
 
     switch (avctx->codec->type) {
     case AVMEDIA_TYPE_VIDEO:
-        frame->width  = FFMAX(avctx->width , -((-avctx->coded_width )>>avctx->lowres));
-        frame->height = FFMAX(avctx->height, -((-avctx->coded_height)>>avctx->lowres));
+        frame->width  = FFMAX(avctx->width,  FF_CEIL_RSHIFT(avctx->coded_width,  avctx->lowres));
+        frame->height = FFMAX(avctx->height, FF_CEIL_RSHIFT(avctx->coded_height, avctx->lowres));
         if (frame->format < 0)
             frame->format              = avctx->pix_fmt;
         if (!frame->sample_aspect_ratio.num)

libavfilter/deshake_opencl.c

@@ -135,7 +135,8 @@ int ff_opencl_deshake_process_inout_buf(AVFilterContext *ctx, AVFrame *in, AVFra
     int ret = 0;
     AVFilterLink *link = ctx->inputs[0];
     DeshakeContext *deshake = ctx->priv;
-    int chroma_height = -((-link->h) >> av_pix_fmt_desc_get(link->format)->log2_chroma_h);
+    const int hshift = av_pix_fmt_desc_get(link->format)->log2_chroma_h;
+    int chroma_height = FF_CEIL_RSHIFT(link->h, hshift);
 
     if ((!deshake->opencl_ctx.cl_inbuf) || (!deshake->opencl_ctx.cl_outbuf)) {
         deshake->opencl_ctx.in_plane_size[0]  = (in->linesize[0] * in->height);

libavfilter/vf_gradfun.c

@@ -172,8 +172,8 @@ static int config_input(AVFilterLink *inlink)
     if (!gf->buf)
         return AVERROR(ENOMEM);
 
-    gf->chroma_w = -((-inlink->w) >> hsub);
-    gf->chroma_h = -((-inlink->h) >> vsub);
+    gf->chroma_w = FF_CEIL_RSHIFT(inlink->w, hsub);
+    gf->chroma_h = FF_CEIL_RSHIFT(inlink->h, vsub);
     gf->chroma_r = av_clip(((((gf->radius >> hsub) + (gf->radius >> vsub)) / 2 ) + 1) & ~1, 4, 32);
 
     return 0;

libavfilter/vf_tinterlace.c

@@ -175,7 +175,7 @@ void copy_picture_field(uint8_t *dst[4], int dst_linesize[4],
     int h, i;
 
     for (plane = 0; plane < desc->nb_components; plane++) {
-        int lines = plane == 1 || plane == 2 ? -((-src_h) >> vsub) : src_h;
+        int lines = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(src_h, vsub) : src_h;
         int linesize = av_image_get_linesize(format, w, plane);
         uint8_t *dstp = dst[plane];
         const uint8_t *srcp = src[plane];

libavutil/common.h

@@ -48,6 +48,8 @@
 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
 /* assume b>0 */
 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
+/* assume a>0 and b>0 */
+#define FF_CEIL_RSHIFT(a,b) (-((-(a)) >> (b)))
 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))