[libav-commits] hevc: refactor Profile Tier Level

Gildas Cocherel git at libav.org
Fri Dec 20 19:48:05 CET 2013


Module: libav
Branch: master
Commit: 2d18aaa14bc2233b0647d2c5abb72e0bc828c2a8

Author:    Gildas Cocherel <gildas.cocherel at laposte.net>
Committer: Anton Khirnov <anton at khirnov.net>
Date:      Thu Dec 19 00:36:45 2013 +0100

hevc: refactor Profile Tier Level

Also store a few PTL flags which were skipped before

Signed-off-by: Anton Khirnov <anton at khirnov.net>

---

 libavcodec/hevc.h    |   25 +++++++++++---------
 libavcodec/hevc_ps.c |   63 +++++++++++++++++++++++++-------------------------
 2 files changed, 45 insertions(+), 43 deletions(-)

diff --git a/libavcodec/hevc.h b/libavcodec/hevc.h
index bd6f50f..f2a8dfa 100644
--- a/libavcodec/hevc.h
+++ b/libavcodec/hevc.h
@@ -328,21 +328,24 @@ typedef struct VUI {
     int log2_max_mv_length_vertical;
 } VUI;
 
+typedef struct PTLCommon {
+    uint8_t profile_space;
+    uint8_t tier_flag;
+    uint8_t profile_idc;
+    uint8_t profile_compatibility_flag[32];
+    uint8_t level_idc;
+    uint8_t progressive_source_flag;
+    uint8_t interlaced_source_flag;
+    uint8_t non_packed_constraint_flag;
+    uint8_t frame_only_constraint_flag;
+} PTLCommon;
+
 typedef struct PTL {
-    int general_profile_space;
-    uint8_t general_tier_flag;
-    int general_profile_idc;
-    int general_profile_compatibility_flag[32];
-    int general_level_idc;
+    PTLCommon general_ptl;
+    PTLCommon sub_layer_ptl[MAX_SUB_LAYERS];
 
     uint8_t sub_layer_profile_present_flag[MAX_SUB_LAYERS];
     uint8_t sub_layer_level_present_flag[MAX_SUB_LAYERS];
-
-    int sub_layer_profile_space[MAX_SUB_LAYERS];
-    uint8_t sub_layer_tier_flag[MAX_SUB_LAYERS];
-    int sub_layer_profile_idc[MAX_SUB_LAYERS];
-    uint8_t sub_layer_profile_compatibility_flags[MAX_SUB_LAYERS][32];
-    int sub_layer_level_idc[MAX_SUB_LAYERS];
 } PTL;
 
 typedef struct HEVCVPS {
diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c
index 5f33005..5dde0cd 100644
--- a/libavcodec/hevc_ps.c
+++ b/libavcodec/hevc_ps.c
@@ -192,51 +192,47 @@ int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,
     return 0;
 }
 
-static void decode_profile_tier_level(HEVCLocalContext *lc, PTL *ptl,
-                                     int max_num_sub_layers)
+
+static void decode_profile_tier_level(HEVCContext *s, PTLCommon *ptl)
 {
-    int i, j;
-    GetBitContext *gb = &lc->gb;
+    int i;
+    GetBitContext *gb = &s->HEVClc.gb;
+
+    ptl->profile_space = get_bits(gb, 2);
+    ptl->tier_flag     = get_bits1(gb);
+    ptl->profile_idc   = get_bits(gb, 5);
 
-    ptl->general_profile_space = get_bits(gb, 2);
-    ptl->general_tier_flag     = get_bits1(gb);
-    ptl->general_profile_idc   = get_bits(gb, 5);
     for (i = 0; i < 32; i++)
-        ptl->general_profile_compatibility_flag[i] = get_bits1(gb);
-    skip_bits1(gb); // general_progressive_source_flag
-    skip_bits1(gb); // general_interlaced_source_flag
-    skip_bits1(gb); // general_non_packed_constraint_flag
-    skip_bits1(gb); // general_frame_only_constraint_flag
+        ptl->profile_compatibility_flag[i] = get_bits1(gb);
+    ptl->progressive_source_flag    = get_bits1(gb);
+    ptl->interlaced_source_flag     = get_bits1(gb);
+    ptl->non_packed_constraint_flag = get_bits1(gb);
+    ptl->frame_only_constraint_flag = get_bits1(gb);
+
     skip_bits(gb, 16); // XXX_reserved_zero_44bits[0..15]
     skip_bits(gb, 16); // XXX_reserved_zero_44bits[16..31]
     skip_bits(gb, 12); // XXX_reserved_zero_44bits[32..43]
+}
+
+static void parse_ptl(HEVCContext *s, PTL *ptl, int max_num_sub_layers)
+{
+    int i;
+    GetBitContext *gb = &s->HEVClc.gb;
+    decode_profile_tier_level(s, &ptl->general_ptl);
+    ptl->general_ptl.level_idc = get_bits(gb, 8);
 
-    ptl->general_level_idc = get_bits(gb, 8);
     for (i = 0; i < max_num_sub_layers - 1; i++) {
         ptl->sub_layer_profile_present_flag[i] = get_bits1(gb);
         ptl->sub_layer_level_present_flag[i]   = get_bits1(gb);
     }
     if (max_num_sub_layers - 1 > 0)
         for (i = max_num_sub_layers - 1; i < 8; i++)
-            skip_bits(gb, 2);  // reserved_zero_2bits[i]
+            skip_bits(gb, 2); // reserved_zero_2bits[i]
     for (i = 0; i < max_num_sub_layers - 1; i++) {
-        if (ptl->sub_layer_profile_present_flag[i]) {
-            ptl->sub_layer_profile_space[i] = get_bits(gb, 2);
-            ptl->sub_layer_tier_flag[i]     = get_bits(gb, 1);
-            ptl->sub_layer_profile_idc[i]   = get_bits(gb, 5);
-            for (j = 0; j < 32; j++)
-                ptl->sub_layer_profile_compatibility_flags[i][j] = get_bits1(gb);
-            skip_bits1(gb); // sub_layer_progressive_source_flag
-            skip_bits1(gb); // sub_layer_interlaced_source_flag
-            skip_bits1(gb); // sub_layer_non_packed_constraint_flag
-            skip_bits1(gb); // sub_layer_frame_only_constraint_flag
-
-            skip_bits(gb, 16); // sub_layer_reserved_zero_44bits[0..15]
-            skip_bits(gb, 16); // sub_layer_reserved_zero_44bits[16..31]
-            skip_bits(gb, 12); // sub_layer_reserved_zero_44bits[32..43]
-        }
+        if (ptl->sub_layer_profile_present_flag[i])
+            decode_profile_tier_level(s, &ptl->sub_layer_ptl[i]);
         if (ptl->sub_layer_level_present_flag[i])
-            ptl->sub_layer_level_idc[i] = get_bits(gb, 8);
+            ptl->sub_layer_ptl[i].level_idc = get_bits(gb, 8);
     }
 }
 
@@ -355,7 +351,8 @@ int ff_hevc_decode_nal_vps(HEVCContext *s)
         goto err;
     }
 
-    decode_profile_tier_level(&s->HEVClc, &vps->ptl, vps->vps_max_sub_layers);
+    parse_ptl(s, &vps->ptl, vps->vps_max_sub_layers);
+
     vps->vps_sub_layer_ordering_info_present_flag = get_bits1(gb);
 
     i = vps->vps_sub_layer_ordering_info_present_flag ? 0 : vps->vps_max_sub_layers - 1;
@@ -637,7 +634,9 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
     }
 
     skip_bits1(gb); // temporal_id_nesting_flag
-    decode_profile_tier_level(&s->HEVClc, &sps->ptl, sps->max_sub_layers);
+
+    parse_ptl(s, &sps->ptl, sps->max_sub_layers);
+
     sps_id = get_ue_golomb_long(gb);
     if (sps_id >= MAX_SPS_COUNT) {
         av_log(s->avctx, AV_LOG_ERROR, "SPS id out of range: %d\n", sps_id);



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