1 files changed, 80 insertions, 0 deletions
diff --git a/libavutil/pixdesc.c b/libavutil/pixdesc.c
index 837927ba7d..e4ced8ebfa 100644
--- a/libavutil/pixdesc.c
+++ b/libavutil/pixdesc.c
@@ -22,6 +22,86 @@
 #include "pixfmt.h"
 #include "pixdesc.h"
 
+#include "intreadwrite.h"
+
+void read_line(uint16_t *dst, const uint8_t *data[4], const int linesize[4],
+               const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component)
+{
+    AVComponentDescriptor comp= desc->comp[c];
+    int plane= comp.plane;
+    int depth= comp.depth_minus1+1;
+    int mask = (1<<depth)-1;
+    int shift= comp.shift;
+    int step = comp.step_minus1+1;
+    int flags= desc->flags;
+
+    if (flags & PIX_FMT_BITSTREAM){
+        int skip = x*step + comp.offset_plus1-1;
+        const uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
+        int shift = 8 - depth - (skip&7);
+
+        while(w--){
+            int val = (*p >> shift) & mask;
+            if(read_pal_component)
+                val= data[1][4*val + c];
+            shift -= step;
+            p -= shift>>3;
+            shift &= 7;
+            *dst++= val;
+        }
+    } else {
+        const uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
+
+        while(w--){
+            int val;
+            if(flags & PIX_FMT_BE) val= AV_RB16(p);
+            else                   val= AV_RL16(p);
+            val = (val>>shift) & mask;
+            if(read_pal_component)
+                val= data[1][4*val + c];
+            p+= step;
+            *dst++= val;
+        }
+    }
+}
+
+void write_line(const uint16_t *src, uint8_t *data[4], const int linesize[4],
+                const AVPixFmtDescriptor *desc, int x, int y, int c, int w)
+{
+    AVComponentDescriptor comp = desc->comp[c];
+    int plane = comp.plane;
+    int depth = comp.depth_minus1+1;
+    int step  = comp.step_minus1+1;
+    int flags = desc->flags;
+
+    if (flags & PIX_FMT_BITSTREAM) {
+        int skip = x*step + comp.offset_plus1-1;
+        uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
+        int shift = 8 - depth - (skip&7);
+
+        while (w--) {
+            *p |= *src++ << shift;
+            shift -= step;
+            p -= shift>>3;
+            shift &= 7;
+        }
+    } else {
+        int shift = comp.shift;
+        uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
+
+        while (w--) {
+            if (flags & PIX_FMT_BE) {
+                uint16_t val = AV_RB16(p) | (*src++<<shift);
+                AV_WB16(p, val);
+            } else {
+                uint16_t val = AV_RL16(p) | (*src++<<shift);
+                AV_WL16(p, val);
+            }
+            p+= step;
+        }
+    }
+}
+
 const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB] = {
     [PIX_FMT_YUV420P] = {
         .name = "yuv420p",