libs: encoder: H265: Add screen content coding extensions support.

In scc mode, the I frame can ref to itself and it needs the L0 reference
list enabled. So we should set the I frame to P_SLICE type. We do not need
to change the ref_pic_list0/1 passed to VA driver, just need to enable the
VAEncPictureParameterBufferHEVC->pps_curr_pic_ref_enabled_flag to notify
the driver consider the current frame as reference. For bits conformance,
the NumRpsCurrTempList0 should be incremented by one to include the current
picture as the reference frame. We manually do it when packing the slice header.

Command line like:
gst-launch-1.0  videotestsrc num-buffers=10 ! \
capsfilter caps=video/x-raw,format=NV12, framerate=30/1,width=640,height=360 ! \
vaapih265enc ! capsfilter caps=video/x-h265,profile="{ (string)screen-extended-main }" ! \
filesink location=out.265
Can be used to specify that the encoder should use SCC profiles.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/379>

gst-libs/gst/vaapi/gstvaapiencoder_h265.c

@@ -185,6 +185,18 @@ h265_get_slice_type (GstVaapiPictureType type)
   return -1;
 }
 
+static gboolean
+h265_is_scc (GstVaapiEncoderH265 * encoder)
+{
+  if (encoder->profile == GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN ||
+      encoder->profile == GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_10 ||
+      encoder->profile == GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444 ||
+      encoder->profile == GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444_10)
+    return TRUE;
+
+  return FALSE;
+}
+
 static gboolean
 h265_is_tile_enabled (GstVaapiEncoderH265 * encoder)
 {
@@ -305,8 +317,18 @@ bs_write_profile_tier_level (GstBitWriter * bs,
     WRITE_UINT32 (bs, 0, 1);
   }
 
-  /* general_profile_compatibility_flag[5~32] */
+  /* general_profile_compatibility_flag[5~8] */
-  WRITE_UINT32 (bs, 0, 27);
+  WRITE_UINT32 (bs, 0, 4);
+
+  /* general_profile_compatibility_flag[9] */
+  if (seq_param->general_profile_idc == 9) {    /* screen content coding profiles */
+    WRITE_UINT32 (bs, 1, 1);
+  } else {
+    WRITE_UINT32 (bs, 0, 1);
+  }
+
+  /* general_profile_compatibility_flag[10~32] */
+  WRITE_UINT32 (bs, 0, 22);
 
   /* general_progressive_source_flag */
   WRITE_UINT32 (bs, 1, 1);
@@ -412,6 +434,107 @@ bs_write_profile_tier_level (GstBitWriter * bs,
     /* general_reserved_zero_34bits */
     for (i = 0; i < 34; i++)
       WRITE_UINT32 (bs, 0, 1);
+  } else if (seq_param->general_profile_idc == 9) {
+    /*  In A.3.7, Screen content coding extensions profiles. */
+    switch (profile) {
+      case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN:
+        /* max_12bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_10bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_8bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_422chroma_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_420chroma_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_monochrome_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* intra_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* one_picture_only_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* lower_bit_rate_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* general_max_14bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        break;
+      case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_10:
+        /* max_12bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_10bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_8bit_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* max_422chroma_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_420chroma_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_monochrome_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* intra_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* one_picture_only_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* lower_bit_rate_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* general_max_14bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        break;
+      case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444:
+        /* max_12bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_10bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_8bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_422chroma_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* max_420chroma_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* max_monochrome_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* intra_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* one_picture_only_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* lower_bit_rate_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* general_max_14bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        break;
+      case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444_10:
+        /* max_12bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_10bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* max_8bit_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* max_422chroma_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* max_420chroma_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* max_monochrome_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* intra_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* one_picture_only_constraint_flag */
+        WRITE_UINT32 (bs, 0, 1);
+        /* lower_bit_rate_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        /* general_max_14bit_constraint_flag */
+        WRITE_UINT32 (bs, 1, 1);
+        break;
+      default:
+        GST_WARNING ("do not support the profile: %s of screen"
+            " content coding extensions",
+            gst_vaapi_profile_get_va_name (profile));
+        goto bs_error;
+    }
+
+    /* general_reserved_zero_33bits */
+    for (i = 0; i < 33; i++)
+      WRITE_UINT32 (bs, 0, 1);
   } else {
     /* general_reserved_zero_43bits */
     for (i = 0; i < 43; i++)
@@ -703,8 +826,40 @@ bs_write_sps_data (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
     /* bitstream_restriction_flag */
     WRITE_UINT32 (bs, seq_param->vui_fields.bits.bitstream_restriction_flag, 1);
   }
+
+  if (h265_is_scc (encoder)) {
+    /* sps_extension_flag */
+    WRITE_UINT32 (bs, 1, 1);
+    /* sps_range_extension_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* sps_multilayer_extension_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* sps_3d_extension_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* sps_scc_extension_flag */
+    WRITE_UINT32 (bs, 1, 1);
+    /* sps_extension_4bits */
+    WRITE_UINT32 (bs, 0, 4);
+
+    /* sps_scc_extension() */
+    /* sps_curr_pic_ref_enabled_flag */
+    WRITE_UINT32 (bs, 1, 1);
+    /* palette_mode_enabled_flag */
+    WRITE_UINT32 (bs, 1, 1);
+    /* palette_max_size */
+    WRITE_UE (bs, 64);
+    /* delta_palette_max_predictor_size */
+    WRITE_UE (bs, 32);
+    /* sps_palette_predictor_initializers_present_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* motion_vector_resolution_control_idc */
+    WRITE_UINT32 (bs, 0, 2);
+    /* intra_boundary_filtering_disabled_flag */
+    WRITE_UINT32 (bs, 0, 1);
+  } else {
     /* sps_extension_flag */
     WRITE_UINT32 (bs, sps_extension_flag, 1);
+  }
 
   return TRUE;
 
@@ -734,7 +889,7 @@ bs_write_sps (GstBitWriter * bs, GstVaapiEncoderH265 * encoder,
 
 /* Write a PPS NAL unit */
 static gboolean
-bs_write_pps (GstBitWriter * bs,
+bs_write_pps (GstBitWriter * bs, gboolean is_scc,
     const VAEncPictureParameterBufferHEVC * pic_param)
 {
   guint32 pic_parameter_set_id = 0;
@@ -831,8 +986,39 @@ bs_write_pps (GstBitWriter * bs,
   WRITE_UE (bs, pic_param->log2_parallel_merge_level_minus2);
   /* slice_segment_header_extension_present_flag */
   WRITE_UINT32 (bs, slice_segment_header_extension_present_flag, 1);
+
+  if (is_scc) {
+#if VA_CHECK_VERSION(1,8,0)
+    /* pps_extension_flag */
+    WRITE_UINT32 (bs, 1, 1);
+    /* pps_range_extension_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* pps_multilayer_extension_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* pps_3d_extension_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* pps_scc_extension_flag */
+    WRITE_UINT32 (bs, 1, 1);
+    /* pps_extension_4bits */
+    WRITE_UINT32 (bs, 0, 4);
+
+    /* pps_scc_extension() */
+    /* pps_curr_pic_ref_enabled_flag */
+    WRITE_UINT32 (bs,
+        pic_param->scc_fields.bits.pps_curr_pic_ref_enabled_flag, 1);
+    /* residual_adaptive_colour_transform_enabled_flag */
+    WRITE_UINT32 (bs, 0, 1);
+    /* pps_palette_predictor_initializers_present_flag */
+    WRITE_UINT32 (bs, 0, 1);
+#else
+    /* SCC profile should not be selected. */
+    g_assert_not_reached ();
+    return FALSE;
+#endif
+  } else {
     /* pps_extension_flag */
     WRITE_UINT32 (bs, pps_extension_flag, 1);
+  }
 
   /* rbsp_trailing_bits */
   bs_write_trailing_bits (bs);
@@ -863,6 +1049,11 @@ bs_write_slice (GstBitWriter * bs,
   guint8 num_ref_idx_active_override_flag =
       slice_param->slice_fields.bits.num_ref_idx_active_override_flag;
 
+  if (h265_is_scc (encoder)) {
+    /* If scc, need to add the current picture itself. */
+    num_ref_idx_active_override_flag = 1;
+  }
+
   /* first_slice_segment_in_pic_flag */
   WRITE_UINT32 (bs, encoder->first_slice_segment_in_pic_flag, 1);
 
@@ -985,7 +1176,20 @@ bs_write_slice (GstBitWriter * bs,
       /* num_ref_idx_active_override_flag */
       WRITE_UINT32 (bs, num_ref_idx_active_override_flag, 1);
       if (num_ref_idx_active_override_flag) {
+        if (h265_is_scc (encoder)) {
+          if (picture->type == GST_VAAPI_PICTURE_TYPE_I) {
+            g_assert (slice_param->num_ref_idx_l0_active_minus1 == 0);
+            /* Let num_ref_idx_l0_active_minus1 = 0 and
+               NumRpsCurrTempList0 = 1 to include current picture itself */
+            WRITE_UE (bs, 0);
+          } else {
+            /* For scc, need to add 1 for current picture itself when
+               calculating NumRpsCurrTempList0. */
+            WRITE_UE (bs, slice_param->num_ref_idx_l0_active_minus1 + 1);
+          }
+        } else {
           WRITE_UE (bs, slice_param->num_ref_idx_l0_active_minus1);
+        }
         if (slice_param->slice_type == GST_H265_B_SLICE)
           WRITE_UE (bs, slice_param->num_ref_idx_l1_active_minus1);
       }
@@ -1101,7 +1305,7 @@ ensure_profile (GstVaapiEncoderH265 * encoder)
   const GstVideoFormat format =
       GST_VIDEO_INFO_FORMAT (GST_VAAPI_ENCODER_VIDEO_INFO (encoder));
   guint depth, chrome;
-  GstVaapiProfile profile_candidates[4];
+  GstVaapiProfile profile_candidates[6];
   guint num, i;
 
   g_assert (GST_VIDEO_FORMAT_INFO_IS_YUV (gst_video_format_get_info (format)));
@@ -1117,6 +1321,15 @@ ensure_profile (GstVaapiEncoderH265 * encoder)
       profile_candidates[num++] = GST_VAAPI_PROFILE_H265_MAIN_444;
     if (depth <= 10)
       profile_candidates[num++] = GST_VAAPI_PROFILE_H265_MAIN_444_10;
+#if VA_CHECK_VERSION(1,8,0)
+    /* Consider SCREEN_EXTENDED_MAIN_444 and SCREEN_EXTENDED_MAIN_444_10 */
+    if (depth == 8)
+      profile_candidates[num++] =
+          GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444;
+    if (depth <= 10)
+      profile_candidates[num++] =
+          GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444_10;
+#endif
   } else if (chrome == 2) {
     /* 4:2:2 */
     profile_candidates[num++] = GST_VAAPI_PROFILE_H265_MAIN_422_10;
@@ -1131,6 +1344,14 @@ ensure_profile (GstVaapiEncoderH265 * encoder)
     /* Always add STILL_PICTURE as a candidate for Main and Main10. */
     if (depth <= 10)
       profile_candidates[num++] = GST_VAAPI_PROFILE_H265_MAIN_STILL_PICTURE;
+#if VA_CHECK_VERSION(1,8,0)
+    /* Consider SCREEN_EXTENDED_MAIN and SCREEN_EXTENDED_MAIN_10 */
+    if (depth == 8)
+      profile_candidates[num++] = GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN;
+    if (depth <= 10)
+      profile_candidates[num++] =
+          GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_10;
+#endif
   }
 
   if (num == 0) {
@@ -1436,7 +1657,7 @@ add_packed_picture_header (GstVaapiEncoderH265 * encoder,
   gst_bit_writer_init_with_size (&bs, 128, FALSE);
   WRITE_UINT32 (&bs, 0x00000001, 32);   /* start code */
   bs_write_nal_header (&bs, GST_H265_NAL_PPS);
-  bs_write_pps (&bs, pic_param);
+  bs_write_pps (&bs, h265_is_scc (encoder), pic_param);
   g_assert (GST_BIT_WRITER_BIT_SIZE (&bs) % 8 == 0);
   data_bit_size = GST_BIT_WRITER_BIT_SIZE (&bs);
   data = GST_BIT_WRITER_DATA (&bs);
@@ -1727,6 +1948,17 @@ fill_sequence (GstVaapiEncoderH265 * encoder, GstVaapiEncSequence * sequence)
       seq_param->vui_time_scale = GST_VAAPI_ENCODER_FPS_N (encoder);
     }
   }
+
+  if (h265_is_scc (encoder)) {
+#if VA_CHECK_VERSION(1,8,0)
+    seq_param->scc_fields.bits.palette_mode_enabled_flag = 1;
+#else
+    /* SCC profile should not be selected. */
+    g_assert_not_reached ();
+    return FALSE;
+#endif
+  }
+
   return TRUE;
 }
 
@@ -1841,6 +2073,16 @@ fill_picture (GstVaapiEncoderH265 * encoder, GstVaapiEncPicture * picture,
       pic_param->row_height_minus1[i] = tile_ctu_rows[i] - 1;
   }
 
+  if (h265_is_scc (encoder)) {
+#if VA_CHECK_VERSION(1,8,0)
+    pic_param->scc_fields.bits.pps_curr_pic_ref_enabled_flag = 1;
+#else
+    /* SCC profile should not be selected. */
+    g_assert_not_reached ();
+    return FALSE;
+#endif
+  }
+
   return TRUE;
 }
 
@@ -1862,7 +2104,16 @@ create_and_fill_one_slice (GstVaapiEncoderH265 * encoder,
   slice_param->slice_type = h265_get_slice_type (picture->type);
   if (encoder->no_p_frame && slice_param->slice_type == GST_H265_P_SLICE) {
     slice_param->slice_type = GST_H265_B_SLICE;
+  } else if (h265_is_scc (encoder) &&
+      slice_param->slice_type == GST_H265_I_SLICE) {
+    /* In scc mode, the I frame can ref to itself and so need the L0
+       reference list enabled. Just set the I frame to P_SLICE type
+       and leaving all reference unchanged. So all ref_pic_list0's
+       picture is invalid, the only ref is itself enabled by
+       pic_param->scc_fields.bits.pps_curr_pic_ref_enabled_flag. */
+    slice_param->slice_type = GST_H265_P_SLICE;
   }
+
   slice_param->slice_pic_parameter_set_id = 0;
 
   slice_param->slice_fields.bits.num_ref_idx_active_override_flag =

gst-libs/gst/vaapi/gstvaapiutils_h265.c

@@ -44,6 +44,10 @@ static const struct map gst_vaapi_h265_profile_map[] = {
   { GST_VAAPI_PROFILE_H265_MAIN_444_10,          "main-444-10"          },
   { GST_VAAPI_PROFILE_H265_MAIN_422_10,          "main-422-10"          },
   { GST_VAAPI_PROFILE_H265_MAIN12,               "main-12"              },
+  { GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN,        "screen-extended-main"       },
+  { GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_10,     "screen-extended-main-10"    },
+  { GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444,    "screen-extended-main-444"   },
+  { GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444_10, "screen-extended-main-444-10"},
   { 0, NULL }
 /* *INDENT-ON* */
 };
@@ -236,6 +240,15 @@ gst_vaapi_utils_h265_get_profile_idc (GstVaapiProfile profile)
     case GST_VAAPI_PROFILE_H265_MAIN12:
       profile_idc = GST_H265_PROFILE_IDC_FORMAT_RANGE_EXTENSION;
       break;
+    case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN:
+      /* Fall through */
+    case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_10:
+      /* Fall through */
+    case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444:
+      /* Fall through */
+    case GST_VAAPI_PROFILE_H265_SCREEN_EXTENDED_MAIN_444_10:
+      profile_idc = GST_H265_PROFILE_IDC_SCREEN_CONTENT_CODING;
+      break;
     default:
       GST_DEBUG ("unsupported GstVaapiProfile value");
       profile_idc = 0;