avcodec/hevcdec: remove HEVCContext usage from ff_hevc_compute_poc()

Move it to hevc_ps as well. This is in preparation for a following patch.
Reviewed-by: Hendrik Leppkes <h.leppkes@gmail.com>
Reviewed-by: Aaron Levinson <alevinsn@aracnet.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/hevc_parser.c

@@ -379,7 +379,7 @@ static inline int parse_nal_units(AVCodecParserContext *s, const uint8_t *buf,
 
             if (!IS_IDR(h)) {
                 sh->pic_order_cnt_lsb = get_bits(gb, ps->sps->log2_max_poc_lsb);
-                s->output_picture_number = h->poc = ff_hevc_compute_poc(h, sh->pic_order_cnt_lsb);
+                s->output_picture_number = h->poc = ff_hevc_compute_poc(h->ps.sps, h->pocTid0, sh->pic_order_cnt_lsb, h->nal_unit_type);
             } else
                 s->output_picture_number = h->poc = 0;
 

libavcodec/hevc_ps.c

@@ -1665,3 +1665,26 @@ err:
     av_buffer_unref(&pps_buf);
     return ret;
 }
+
+int ff_hevc_compute_poc(const HEVCSPS *sps, int pocTid0, int poc_lsb, int nal_unit_type)
+{
+    int max_poc_lsb  = 1 << sps->log2_max_poc_lsb;
+    int prev_poc_lsb = pocTid0 % max_poc_lsb;
+    int prev_poc_msb = pocTid0 - prev_poc_lsb;
+    int poc_msb;
+
+    if (poc_lsb < prev_poc_lsb && prev_poc_lsb - poc_lsb >= max_poc_lsb / 2)
+        poc_msb = prev_poc_msb + max_poc_lsb;
+    else if (poc_lsb > prev_poc_lsb && poc_lsb - prev_poc_lsb > max_poc_lsb / 2)
+        poc_msb = prev_poc_msb - max_poc_lsb;
+    else
+        poc_msb = prev_poc_msb;
+
+    // For BLA picture types, POCmsb is set to 0.
+    if (nal_unit_type == HEVC_NAL_BLA_W_LP   ||
+        nal_unit_type == HEVC_NAL_BLA_W_RADL ||
+        nal_unit_type == HEVC_NAL_BLA_N_LP)
+        poc_msb = 0;
+
+    return poc_msb + poc_lsb;
+}

libavcodec/hevc_ps.h

@@ -344,4 +344,9 @@ int ff_hevc_decode_short_term_rps(GetBitContext *gb, AVCodecContext *avctx,
 int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int id,
                            uint8_t *buf, int buf_size);
 
+/**
+ * Compute POC of the current frame and return it.
+ */
+int ff_hevc_compute_poc(const HEVCSPS *sps, int pocTid0, int poc_lsb, int nal_unit_type);
+
 #endif /* AVCODEC_HEVC_PS_H */

libavcodec/hevc_refs.c

@@ -516,29 +516,6 @@ fail:
     return ret;
 }
 
-int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb)
-{
-    int max_poc_lsb  = 1 << s->ps.sps->log2_max_poc_lsb;
-    int prev_poc_lsb = s->pocTid0 % max_poc_lsb;
-    int prev_poc_msb = s->pocTid0 - prev_poc_lsb;
-    int poc_msb;
-
-    if (poc_lsb < prev_poc_lsb && prev_poc_lsb - poc_lsb >= max_poc_lsb / 2)
-        poc_msb = prev_poc_msb + max_poc_lsb;
-    else if (poc_lsb > prev_poc_lsb && poc_lsb - prev_poc_lsb > max_poc_lsb / 2)
-        poc_msb = prev_poc_msb - max_poc_lsb;
-    else
-        poc_msb = prev_poc_msb;
-
-    // For BLA picture types, POCmsb is set to 0.
-    if (s->nal_unit_type == HEVC_NAL_BLA_W_LP   ||
-        s->nal_unit_type == HEVC_NAL_BLA_W_RADL ||
-        s->nal_unit_type == HEVC_NAL_BLA_N_LP)
-        poc_msb = 0;
-
-    return poc_msb + poc_lsb;
-}
-
 int ff_hevc_frame_nb_refs(HEVCContext *s)
 {
     int ret = 0;

libavcodec/hevcdec.c

@@ -541,7 +541,7 @@ static int hls_slice_header(HEVCContext *s)
             int poc, pos;
 
             sh->pic_order_cnt_lsb = get_bits(gb, s->ps.sps->log2_max_poc_lsb);
-            poc = ff_hevc_compute_poc(s, sh->pic_order_cnt_lsb);
+            poc = ff_hevc_compute_poc(s->ps.sps, s->pocTid0, sh->pic_order_cnt_lsb, s->nal_unit_type);
             if (!sh->first_slice_in_pic_flag && poc != s->poc) {
                 av_log(s->avctx, AV_LOG_WARNING,
                        "Ignoring POC change between slices: %d -> %d\n", s->poc, poc);

libavcodec/hevcdec.h

@@ -579,11 +579,6 @@ void ff_hevc_clear_refs(HEVCContext *s);
  */
 void ff_hevc_flush_dpb(HEVCContext *s);
 
-/**
- * Compute POC of the current frame and return it.
- */
-int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb);
-
 RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *frame,
                                  int x0, int y0);