hevc: cosmetic change(cherry picked from commit 3b57513b3f39c04337801fb9d159c7ca8dfa9deb)

Decreases the difference to Anton Khirnovs patch v5
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevc_ps.c

@@ -838,28 +838,27 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
         goto err;
     }
 
-    /* if an SPS with this id but different dimensions already exists, remove
-     * all PPSes that depend on it */
-#define DIFF(x) (sps->x != ((HEVCSPS*)s->sps_list[sps_id]->data)->x)
+    if (s->avctx->debug & FF_DEBUG_BITSTREAM) {
+        av_log(s->avctx, AV_LOG_DEBUG, "Parsed SPS: id %d; coded wxh: %dx%d; "
+               "cropped wxh: %dx%d; pix_fmt: %s.\n",
+               sps_id, sps->width, sps->height,
+               sps->output_width, sps->output_height,
+               av_get_pix_fmt_name(sps->pix_fmt));
+    }
+
+    /* check if this is a repeat of an already parsed SPS, then keep the
+     * original one.
+     * otherwise drop all PPSes that depend on it */
     if (s->sps_list[sps_id] &&
-        (DIFF(width) || DIFF(height) || DIFF(chroma_format_idc) ||
-         DIFF(bit_depth) || DIFF(ctb_width) || DIFF(ctb_height))) {
+        !memcmp(s->sps_list[sps_id]->data, sps_buf->data, sps_buf->size)) {
+        av_buffer_unref(&sps_buf);
+    } else {
         for (i = 0; i < FF_ARRAY_ELEMS(s->pps_list); i++) {
             if (s->pps_list[i] && ((HEVCPPS*)s->pps_list[i]->data)->sps_id == sps_id)
                 av_buffer_unref(&s->pps_list[i]);
         }
-    }
-#undef DIFF
-
         av_buffer_unref(&s->sps_list[sps_id]);
         s->sps_list[sps_id] = sps_buf;
-
-    if (s->avctx->debug & FF_DEBUG_BITSTREAM) {
-        av_log(s->avctx, AV_LOG_DEBUG, "Parsed SPS: id %d; coded wxh: %dx%d; "
-               "cropped wxh: %dx%d; pix_fmt: %s.\n",
-               sps_id, sps->width, sps->height,
-               sps->output_width, sps->output_height,
-               av_get_pix_fmt_name(sps->pix_fmt));
     }
 
     return 0;