[FFmpeg-cvslog] avcodec/lcldec: Support 4:1:1 and 4:2:2 with odd width

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Thu Mar  9 13:57:15 2023 +0100| [77846c39fc085dd8be7827e699461fbbd75c1799] | committer: Michael Niedermayer

avcodec/lcldec: Support 4:1:1 and 4:2:2 with odd width

Fixes: Ticket10240
Fixes: zlib_306_306_yuv422.avi
Fixes: zlib_306_306_yuv411.avi

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 0cf1ac905d2d97355a389c3baa4e132824b29f21)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=77846c39fc085dd8be7827e699461fbbd75c1799
---

 libavcodec/lcldec.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/libavcodec/lcldec.c b/libavcodec/lcldec.c
index ed87e6179b..97813b0e00 100644
--- a/libavcodec/lcldec.c
+++ b/libavcodec/lcldec.c
@@ -399,6 +399,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
                 v_out[ col >> 1     ] = *encoded++ + 128;
                 v_out[(col >> 1) + 1] = *encoded++ + 128;
             }
+            if (col && col < width) {
+                u_out[ col >> 1     ] = u_out[(col>>1) - 1];
+                v_out[ col >> 1     ] = v_out[(col>>1) - 1];
+            }
+
             y_out -= frame->linesize[0];
             u_out -= frame->linesize[1];
             v_out -= frame->linesize[2];
@@ -420,6 +425,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPac
                 u_out[col >> 2] = *encoded++ + 128;
                 v_out[col >> 2] = *encoded++ + 128;
             }
+            if (col && col < width) {
+                u_out[col >> 2] = u_out[(col>>2) - 1];
+                v_out[col >> 2] = v_out[(col>>2) - 1];
+            }
             y_out -= frame->linesize[0];
             u_out -= frame->linesize[1];
             v_out -= frame->linesize[2];
@@ -477,6 +486,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
                                 FFALIGN(avctx->height, 4);
     unsigned int max_decomp_size;
     int subsample_h, subsample_v;
+    int partial_h_supported = 0;
 
     if (avctx->extradata_size < 8) {
         av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
@@ -498,14 +508,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
         break;
     case IMGTYPE_YUV422:
-        c->decomp_size = basesize * 2;
+        c->decomp_size = (avctx->width & ~3) * avctx->height * 2;
         max_decomp_size = max_basesize * 2;
         avctx->pix_fmt = AV_PIX_FMT_YUV422P;
         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
-        if (avctx->width % 4) {
-            avpriv_request_sample(avctx, "Unsupported dimensions");
-            return AVERROR_INVALIDDATA;
-        }
+        partial_h_supported = 1;
         break;
     case IMGTYPE_RGB24:
         c->decomp_size = basesize * 3;
@@ -514,10 +521,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
         av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
         break;
     case IMGTYPE_YUV411:
-        c->decomp_size = basesize / 2 * 3;
+        c->decomp_size = (avctx->width & ~3) * avctx->height / 2 * 3;
         max_decomp_size = max_basesize / 2 * 3;
         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
         av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
+        partial_h_supported = 1;
         break;
     case IMGTYPE_YUV211:
         c->decomp_size = basesize * 2;
@@ -537,7 +545,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     }
 
     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
-    if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
+    if ((avctx->width % (1<<subsample_h) && !partial_h_supported) || avctx->height % (1<<subsample_v)) {
         avpriv_request_sample(avctx, "Unsupported dimensions");
         return AVERROR_INVALIDDATA;
     }