packetizer: hevc: parse pic timing

modules/packetizer/hevc_nal.c

@@ -1307,3 +1307,46 @@ int hevc_compute_picture_order_count( const hevc_sequence_parameter_set_t *p_sps
 
     return pocMSB + p_slice->pic_order_cnt_lsb;
 }
+
+struct hevc_sei_pic_timing_t
+{
+    nal_u4_t pic_struct;
+};
+
+void hevc_release_sei_pic_timing( hevc_sei_pic_timing_t *p_timing )
+{
+    free( p_timing );
+}
+
+hevc_sei_pic_timing_t * hevc_decode_sei_pic_timing( bs_t *p_bs,
+                                                    const hevc_sequence_parameter_set_t *p_sps )
+{
+    hevc_sei_pic_timing_t *p_timing = malloc(sizeof(*p_timing));
+    if( p_timing )
+    {
+        if( p_sps->vui.frame_field_info_present_flag )
+            p_timing->pic_struct = bs_read( p_bs, 4 );
+        else
+            p_timing->pic_struct = 0;
+    }
+    return p_timing;
+}
+
+uint8_t hevc_get_num_clock_ts( const hevc_sequence_parameter_set_t *p_sps,
+                               const hevc_sei_pic_timing_t *p_timing )
+{
+    if( p_sps->vui.frame_field_info_present_flag && p_timing && p_timing->pic_struct < 13 )
+    {
+        /* !WARN modified with units_field_based_flag (D.3.25) for values 0, 7 and 8 */
+        const uint8_t rgi_numclock[13] = { 2, 1, 1, 2, 2, 3, 3, 4, 6, 1, 1, 1, 1 };
+        return rgi_numclock[p_timing->pic_struct];
+    }
+
+    if( p_sps->vui_parameters_present_flag )
+    {
+        if( p_sps->vui.field_seq_flag )
+            return 1; /* D.3.27 */
+    }
+
+    return 2;
+}

modules/packetizer/hevc_nal.h

@@ -20,8 +20,8 @@
 #ifndef HEVC_NAL_H
 # define HEVC_NAL_H
 
-# include <vlc_common.h>
 # include <vlc_es.h>
+# include <vlc_bits.h>
 
 #define HEVC_VPS_ID_MAX 15
 #define HEVC_SPS_ID_MAX 15
@@ -213,4 +213,13 @@ int hevc_compute_picture_order_count( const hevc_sequence_parameter_set_t *p_sps
                                        const hevc_slice_segment_header_t *slice,
                                        hevc_poc_ctx_t *ctx );
 
+typedef struct hevc_sei_pic_timing_t hevc_sei_pic_timing_t;
+
+hevc_sei_pic_timing_t * hevc_decode_sei_pic_timing( bs_t *,
+                                                    const hevc_sequence_parameter_set_t * );
+void hevc_release_sei_pic_timing( hevc_sei_pic_timing_t * );
+
+uint8_t hevc_get_num_clock_ts( const hevc_sequence_parameter_set_t *,
+                               const hevc_sei_pic_timing_t * /* can be NULL */ );
+
 #endif /* HEVC_NAL_H */