avfilter/vf_stereo3d: add interleave columns output format

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_stereo3d.c

@@ -62,6 +62,8 @@ enum StereoCode {
     ALTERNATING_RL,     // alternating frames (right eye first, left eye second)
     CHECKERBOARD_LR,    // checkerboard pattern (left eye first, right eye second)
     CHECKERBOARD_RL,    // checkerboard pattern (right eye first, left eye second)
+    INTERLEAVE_COLS_LR, // column-interleave (left eye first, right eye second)
+    INTERLEAVE_COLS_RL, // column-interleave (right eye first, left eye second)
     HDMI,               // HDMI frame pack (left eye first, right eye second)
     STEREO_CODE_COUNT   // TODO: needs autodetection
 };
@@ -198,6 +200,8 @@ static const AVOption stereo3d_options[] = {
     { "sbsr",  "side by side right first",            0, AV_OPT_TYPE_CONST, {.i64=SIDE_BY_SIDE_RL},    0, 0, FLAGS, "out" },
     { "chl",   "checkerboard left first",             0, AV_OPT_TYPE_CONST, {.i64=CHECKERBOARD_LR},    0, 0, FLAGS, "out" },
     { "chr",   "checkerboard right first",            0, AV_OPT_TYPE_CONST, {.i64=CHECKERBOARD_RL},    0, 0, FLAGS, "out" },
+    { "icl",   "interleave columns left first",       0, AV_OPT_TYPE_CONST, {.i64=INTERLEAVE_COLS_LR}, 0, 0, FLAGS, "out" },
+    { "icr",   "interleave columns right first",      0, AV_OPT_TYPE_CONST, {.i64=INTERLEAVE_COLS_RL}, 0, 0, FLAGS, "out" },
     { "hdmi",  "HDMI frame pack",                     0, AV_OPT_TYPE_CONST, {.i64=HDMI},               0, 0, FLAGS, "out" },
     { NULL }
 };
@@ -496,6 +500,10 @@ static int config_output(AVFilterLink *outlink)
     case CHECKERBOARD_RL:
         s->out.width     = s->width * 2;
         break;
+    case INTERLEAVE_COLS_LR:
+    case INTERLEAVE_COLS_RL:
+        s->out.width     = s->width * 2;
+        break;
     default:
         av_log(ctx, AV_LOG_ERROR, "output format %d is not supported\n", s->out.format);
         return AVERROR(EINVAL);
@@ -743,6 +751,61 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
             }
         }
         break;
+    case INTERLEAVE_COLS_LR:
+    case INTERLEAVE_COLS_RL:
+        for (i = 0; i < s->nb_planes; i++) {
+            int x, y;
+
+            for (y = 0; y < s->pheight[i]; y++) {
+                uint8_t *dst = out->data[i] + out->linesize[i] * y;
+                uint8_t *left = ileft->data[i] + ileft->linesize[i] * y * s->in.row_step + s->in_off_left[i];
+                uint8_t *right = iright->data[i] + iright->linesize[i] * y * s->in.row_step + s->in_off_right[i];
+                int p, b;
+
+                if (s->out.format == INTERLEAVE_COLS_LR)
+                    FFSWAP(uint8_t*, left, right);
+
+                switch (s->pixstep[i]) {
+                case 1:
+                    for (x = 0, b = 0, p = 0; x < s->linesize[i] * 2; x+=2, p++, b++) {
+                        dst[x  ] =   b&1  ? left[p] : right[p];
+                        dst[x+1] = !(b&1) ? left[p] : right[p];
+                    }
+                    break;
+                case 2:
+                    for (x = 0, b = 0, p = 0; x < s->linesize[i] * 2; x+=4, p+=2, b++) {
+                        AV_WN16(&dst[x  ],   b&1  ? AV_RN16(&left[p]) : AV_RN16(&right[p]));
+                        AV_WN16(&dst[x+2], !(b&1) ? AV_RN16(&left[p]) : AV_RN16(&right[p]));
+                    }
+                    break;
+                case 3:
+                    for (x = 0, b = 0, p = 0; x < s->linesize[i] * 2; x+=6, p+=3, b++) {
+                        AV_WB24(&dst[x  ],   b&1  ? AV_RB24(&left[p]) : AV_RB24(&right[p]));
+                        AV_WB24(&dst[x+3], !(b&1) ? AV_RB24(&left[p]) : AV_RB24(&right[p]));
+                    }
+                    break;
+                case 4:
+                    for (x = 0, b = 0, p = 0; x < s->linesize[i] * 2; x+=8, p+=4, b++) {
+                        AV_WN32(&dst[x  ],   b&1  ? AV_RN32(&left[p]) : AV_RN32(&right[p]));
+                        AV_WN32(&dst[x+4], !(b&1) ? AV_RN32(&left[p]) : AV_RN32(&right[p]));
+                    }
+                    break;
+                case 6:
+                    for (x = 0, b = 0, p = 0; x < s->linesize[i] * 2; x+=12, p+=6, b++) {
+                        AV_WB48(&dst[x  ],   b&1  ? AV_RB48(&left[p]) : AV_RB48(&right[p]));
+                        AV_WB48(&dst[x+6], !(b&1) ? AV_RB48(&left[p]) : AV_RB48(&right[p]));
+                    }
+                    break;
+                case 8:
+                    for (x = 0, b = 0, p = 0; x < s->linesize[i] * 2; x+=16, p+=8, b++) {
+                        AV_WN64(&dst[x  ],   b&1 ?  AV_RN64(&left[p]) : AV_RN64(&right[p]));
+                        AV_WN64(&dst[x+8], !(b&1) ? AV_RN64(&left[p]) : AV_RN64(&right[p]));
+                    }
+                    break;
+                }
+            }
+        }
+        break;
     default:
         av_assert0(0);
     }