tiff: planar rgb

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

libavcodec/tiff.c

@@ -52,6 +52,7 @@ typedef struct TiffContext {
     int le;
     enum TiffCompr compr;
     int invert;
+    int planar;
     int fax_opts;
     int predictor;
     int fill_order;
@@ -431,6 +432,9 @@ static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
     const uint8_t *ssrc = src;
     int width = ((s->width * s->bpp) + 7) >> 3;
 
+    if (s->planar)
+        width /= s->bppcount;
+
     if (size <= 0)
         return AVERROR_INVALIDDATA;
 
@@ -617,22 +621,24 @@ static int init_image(TiffContext *s, AVFrame *frame)
         s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
         break;
     case 243:
-        s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
+        s->avctx->pix_fmt = s->planar ? AV_PIX_FMT_GBRP : AV_PIX_FMT_RGB24;
         break;
     case 161:
         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;
         break;
     case 162:
-        s->avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
+        s->avctx->pix_fmt = s>planar ? AV_PIX_FMT_NONE : AV_PIX_FMT_GRAY8A;
         break;
     case 324:
-        s->avctx->pix_fmt = AV_PIX_FMT_RGBA;
+        s->avctx->pix_fmt = s->planar ? AV_PIX_FMT_GBRAP : AV_PIX_FMT_RGBA;
         break;
     case 483:
-        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE;
+        s->avctx->pix_fmt = s->planar ? (s->le ? AV_PIX_FMT_GBRP16LE : AV_PIX_FMT_GBRP16BE) :
+                                        (s->le ? AV_PIX_FMT_RGB48LE  : AV_PIX_FMT_RGB48BE);
         break;
     case 644:
-        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGBA64BE;
+        s->avctx->pix_fmt = s->planar ? (s->le ? AV_PIX_FMT_GBRAP16LE : AV_PIX_FMT_GBRAP16BE) :
+                                        (s->le ? AV_PIX_FMT_RGBA64LE  : AV_PIX_FMT_RGBA64BE);
         break;
     default:
         av_log(s->avctx, AV_LOG_ERROR,
@@ -884,10 +890,7 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
         s->palette_is_set = 1;
         break;
     case TIFF_PLANAR:
-        if (value == 2) {
-            av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
-            return AVERROR_PATCHWELCOME;
-        }
+        s->planar = value == 2;
         break;
     case TIFF_T4OPTIONS:
         if (s->compr == TIFF_G3)
@@ -1042,7 +1045,7 @@ static int decode_frame(AVCodecContext *avctx,
     TiffContext *const s = avctx->priv_data;
     AVFrame *const p = data;
     unsigned off;
-    int id, le, ret;
+    int id, le, ret, plane, planes;
     int i, j, entries;
     int stride;
     unsigned soff, ssize;
@@ -1125,8 +1128,6 @@ static int decode_frame(AVCodecContext *avctx,
         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
         s->stripsize = avpkt->size - s->stripoff;
     }
-    stride = p->linesize[0];
-    dst = p->data[0];
 
     if (s->stripsizesoff) {
         if (s->stripsizesoff >= (unsigned)avpkt->size)
@@ -1144,6 +1145,10 @@ static int decode_frame(AVCodecContext *avctx,
         return AVERROR_INVALIDDATA;
     }
 
+    planes = s->planar ? s->bppcount : 1;
+    for (plane = 0; plane < planes; plane++) {
+        stride = p->linesize[plane];
+        dst = p->data[plane];
     for (i = 0; i < s->height; i += s->rps) {
         if (s->stripsizesoff)
             ssize = tget(&stripsizes, s->sstype, s->le);
@@ -1165,7 +1170,7 @@ static int decode_frame(AVCodecContext *avctx,
         dst += s->rps * stride;
     }
     if (s->predictor == 2) {
-        dst = p->data[0];
+        dst = p->data[plane];
         soff = s->bpp >> 3;
         ssize = s->width * soff;
         if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE ||
@@ -1192,13 +1197,22 @@ static int decode_frame(AVCodecContext *avctx,
     }
 
     if (s->invert) {
-        dst = p->data[0];
+        dst = p->data[plane];
         for (i = 0; i < s->height; i++) {
-            for (j = 0; j < p->linesize[0]; j++)
+            for (j = 0; j < p->linesize[plane]; j++)
                 dst[j] = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];
-            dst += p->linesize[0];
+            dst += p->linesize[plane];
         }
     }
+    }
+
+    if (s->planar && s->bpp_count > 2) {
+        FFSWAP(uint8_t*, p->data[0],     p->data[2]);
+        FFSWAP(int,      p->linesize[0], p->linesize[2]);
+        FFSWAP(uint8_t*, p->data[0],     p->data[1]);
+        FFSWAP(int,      p->linesize[0], p->linesize[1]);
+    }
+
     *got_frame = 1;
 
     return avpkt->size;