lavc/hevc_ps: fix crop info for monochrome

The values of SubWidthC and SubHeightC are 1 in the ITU-T H.265. The
current code use the value of 2.
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/hevc_ps.c

@@ -70,6 +70,14 @@ static const AVRational vui_sar[] = {
     {  2,   1 },
 };
 
+static const uint8_t hevc_sub_width_c[] = {
+    1, 2, 2, 1
+};
+
+static const uint8_t hevc_sub_height_c[] = {
+    1, 2, 1, 1
+};
+
 static void remove_pps(HEVCParamSets *s, int id)
 {
     if (s->pps_list[id] && s->pps == (const HEVCPPS*)s->pps_list[id]->data)
@@ -628,8 +636,8 @@ static void decode_vui(GetBitContext *gb, AVCodecContext *avctx,
         vui->default_display_window_flag = get_bits1(gb);
 
     if (vui->default_display_window_flag) {
-        int vert_mult  = 1 + (sps->chroma_format_idc < 2);
-        int horiz_mult = 1 + (sps->chroma_format_idc < 3);
+        int vert_mult  = hevc_sub_height_c[sps->chroma_format_idc];
+        int horiz_mult = hevc_sub_width_c[sps->chroma_format_idc];
         vui->def_disp_win.left_offset   = get_ue_golomb_long(gb) * horiz_mult;
         vui->def_disp_win.right_offset  = get_ue_golomb_long(gb) * horiz_mult;
         vui->def_disp_win.top_offset    = get_ue_golomb_long(gb) *  vert_mult;
@@ -923,8 +931,8 @@ int ff_hevc_parse_sps(HEVCSPS *sps, GetBitContext *gb, unsigned int *sps_id,
         return ret;
 
     if (get_bits1(gb)) { // pic_conformance_flag
-        int vert_mult  = 1 + (sps->chroma_format_idc < 2);
-        int horiz_mult = 1 + (sps->chroma_format_idc < 3);
+        int vert_mult  = hevc_sub_height_c[sps->chroma_format_idc];
+        int horiz_mult = hevc_sub_width_c[sps->chroma_format_idc];
         sps->pic_conf_win.left_offset   = get_ue_golomb_long(gb) * horiz_mult;
         sps->pic_conf_win.right_offset  = get_ue_golomb_long(gb) * horiz_mult;
         sps->pic_conf_win.top_offset    = get_ue_golomb_long(gb) *  vert_mult;

tests/fate/hevc.mak

@@ -250,6 +250,9 @@ FATE_HEVC-$(call DEMDEC, MOV, HEVC) += fate-hevc-extradata-reload
 
 fate-hevc-extradata-reload: CMD = framemd5 -i $(TARGET_SAMPLES)/hevc/extradata-reload-multi-stsd.mov -sws_flags bitexact
 
+fate-hevc-monochrome-crop: CMD = probeframes -show_entries frame=width,height:stream=width,height $(TARGET_SAMPLES)/hevc/hevc-monochrome.hevc
+FATE_HEVC_FFPROBE-$(call DEMDEC, HEVC, HEVC) += fate-hevc-monochrome-crop
+
 FATE_SAMPLES_AVCONV += $(FATE_HEVC-yes)
 FATE_SAMPLES_FFPROBE += $(FATE_HEVC_FFPROBE-yes)
 

tests/ref/fate/hevc-monochrome-crop

+[FRAME]
+width=384
+height=240
+[/FRAME]
+[STREAM]
+width=384
+height=240
+[/STREAM]