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27 * \brief The HEVC decoding API
29 * This file contains the \ref api_dec_hevc "HEVC decoding API".
42 * \defgroup api_dec_hevc HEVC decoding API
44 * This HEVC decoding API supports Main and Main Still Picture profiles.
45 * And it supports both short slice format and long slice format.
51 * \brief HEVC Decoding Picture Parameter Buffer Structure
53 * This structure conveys picture level parameters and should be sent once
57 typedef struct _VAPictureParameterBufferHEVC
59 /** \brief buffer description of decoded current picture
60 * only VA_PICTURE_HEVC_FIELD_PIC and VA_PICTURE_HEVC_BOTTOM_FIELD
61 * of "flags" fields are meaningful.
63 VAPictureHEVC CurrPic;
64 /** \brief buffer description of reference frames in DPB */
65 VAPictureHEVC ReferenceFrames[15];
66 /** \brief picture width, shall be integer multiple of minimum CB size. */
67 uint16_t pic_width_in_luma_samples;
68 /** \brief picture height, shall be integer multiple of minimum CB size. */
69 uint16_t pic_height_in_luma_samples;
76 /** following flags have same syntax and semantic as those in HEVC spec */
77 uint32_t chroma_format_idc : 2;
78 uint32_t separate_colour_plane_flag : 1;
79 uint32_t pcm_enabled_flag : 1;
80 uint32_t scaling_list_enabled_flag : 1;
81 uint32_t transform_skip_enabled_flag : 1;
82 uint32_t amp_enabled_flag : 1;
83 uint32_t strong_intra_smoothing_enabled_flag : 1;
84 uint32_t sign_data_hiding_enabled_flag : 1;
85 uint32_t constrained_intra_pred_flag : 1;
86 uint32_t cu_qp_delta_enabled_flag : 1;
87 uint32_t weighted_pred_flag : 1;
88 uint32_t weighted_bipred_flag : 1;
89 uint32_t transquant_bypass_enabled_flag : 1;
90 uint32_t tiles_enabled_flag : 1;
91 uint32_t entropy_coding_sync_enabled_flag : 1;
92 uint32_t pps_loop_filter_across_slices_enabled_flag : 1;
93 uint32_t loop_filter_across_tiles_enabled_flag : 1;
94 uint32_t pcm_loop_filter_disabled_flag : 1;
95 /** set based on sps_max_num_reorder_pics of current temporal layer. */
96 uint32_t NoPicReorderingFlag : 1;
97 /** picture has no B slices */
98 uint32_t NoBiPredFlag : 1;
100 uint32_t ReservedBits : 11;
105 /** following parameters have same syntax with those in HEVC spec */
106 /** \brief DPB size for current temporal layer */
107 uint8_t sps_max_dec_pic_buffering_minus1;
108 uint8_t bit_depth_luma_minus8;
109 uint8_t bit_depth_chroma_minus8;
110 uint8_t pcm_sample_bit_depth_luma_minus1;
111 uint8_t pcm_sample_bit_depth_chroma_minus1;
112 uint8_t log2_min_luma_coding_block_size_minus3;
113 uint8_t log2_diff_max_min_luma_coding_block_size;
114 uint8_t log2_min_transform_block_size_minus2;
115 uint8_t log2_diff_max_min_transform_block_size;
116 uint8_t log2_min_pcm_luma_coding_block_size_minus3;
117 uint8_t log2_diff_max_min_pcm_luma_coding_block_size;
118 uint8_t max_transform_hierarchy_depth_intra;
119 uint8_t max_transform_hierarchy_depth_inter;
120 int8_t init_qp_minus26;
121 uint8_t diff_cu_qp_delta_depth;
122 int8_t pps_cb_qp_offset;
123 int8_t pps_cr_qp_offset;
124 uint8_t log2_parallel_merge_level_minus2;
125 uint8_t num_tile_columns_minus1;
126 uint8_t num_tile_rows_minus1;
128 * when uniform_spacing_flag equals 1, application should populate
129 * column_width_minus[], and row_height_minus1[] with approperiate values.
131 uint16_t column_width_minus1[19];
132 uint16_t row_height_minus1[21];
135 * The Following Parameters are needed for Short Slice Format Only.
136 * Only format decoding can ignore them.
140 * \brief Parameters needed for parsing slice segment headers
146 /** following parameters have same syntax with those in HEVC spec */
147 uint32_t lists_modification_present_flag : 1;
148 uint32_t long_term_ref_pics_present_flag : 1;
149 uint32_t sps_temporal_mvp_enabled_flag : 1;
150 uint32_t cabac_init_present_flag : 1;
151 uint32_t output_flag_present_flag : 1;
152 uint32_t dependent_slice_segments_enabled_flag : 1;
153 uint32_t pps_slice_chroma_qp_offsets_present_flag : 1;
154 uint32_t sample_adaptive_offset_enabled_flag : 1;
155 uint32_t deblocking_filter_override_enabled_flag : 1;
156 uint32_t pps_disable_deblocking_filter_flag : 1;
157 uint32_t slice_segment_header_extension_present_flag : 1;
159 /** current picture with NUT between 16 and 21 inclusive */
160 uint32_t RapPicFlag : 1;
161 /** current picture with NUT between 19 and 20 inclusive */
162 uint32_t IdrPicFlag : 1;
163 /** current picture has only intra slices */
164 uint32_t IntraPicFlag : 1;
166 uint32_t ReservedBits : 18;
169 } slice_parsing_fields;
171 /** following parameters have same syntax with those in HEVC spec */
172 uint8_t log2_max_pic_order_cnt_lsb_minus4;
173 uint8_t num_short_term_ref_pic_sets;
174 uint8_t num_long_term_ref_pic_sps;
175 uint8_t num_ref_idx_l0_default_active_minus1;
176 uint8_t num_ref_idx_l1_default_active_minus1;
177 int8_t pps_beta_offset_div2;
178 int8_t pps_tc_offset_div2;
179 uint8_t num_extra_slice_header_bits;
182 * \brief number of bits that structure
183 * short_term_ref_pic_set( num_short_term_ref_pic_sets ) takes in slice
184 * segment header when short_term_ref_pic_set_sps_flag equals 0.
185 * if short_term_ref_pic_set_sps_flag equals 1, the value should be 0.
186 * the bit count is calculated after emulation prevention bytes are removed
188 * This variable is used for accelorater to skip parsing the
189 * short_term_ref_pic_set( num_short_term_ref_pic_sets ) structure.
191 uint32_t st_rps_bits;
193 /** \brief Reserved bytes for future use, must be zero */
194 uint32_t va_reserved[VA_PADDING_MEDIUM];
195 } VAPictureParameterBufferHEVC;
198 * \brief HEVC Slice Parameter Buffer Structure For Long Format
200 * VASliceParameterBufferHEVC structure should be accompanied by a
201 * slice data buffer, which holds the whole raw slice NAL unit bit streams
202 * including start code prefix and emulation prevention bytes not removed.
204 * This structure conveys parameters related to slice segment header and should
205 * be sent once per slice.
207 * For short format, this data structure is not sent by application.
210 typedef struct _VASliceParameterBufferHEVC
212 /** @name Codec-independent Slice Parameter Buffer base. */
216 /** \brief Number of bytes in the slice data buffer for this slice
217 * counting from and including NAL unit header.
219 uint32_t slice_data_size;
220 /** \brief The offset to the NAL unit header for this slice */
221 uint32_t slice_data_offset;
222 /** \brief Slice data buffer flags. See \c VA_SLICE_DATA_FLAG_XXX. */
223 uint32_t slice_data_flag;
225 * \brief Byte offset from NAL unit header to the begining of slice_data().
227 * This byte offset is relative to and includes the NAL unit header
228 * and represents the number of bytes parsed in the slice_header()
229 * after the removal of any emulation prevention bytes in
230 * there. However, the slice data buffer passed to the hardware is
231 * the original bitstream, thus including any emulation prevention
234 uint32_t slice_data_byte_offset;
235 /** HEVC syntax element. */
236 uint32_t slice_segment_address;
237 /** \brief index into ReferenceFrames[]
238 * RefPicList[0][] corresponds to RefPicList0[] of HEVC variable.
239 * RefPicList[1][] corresponds to RefPicList1[] of HEVC variable.
240 * value range [0..14, 0xFF], where 0xFF indicates invalid entry.
242 uint8_t RefPicList[2][15];
248 /** current slice is last slice of picture. */
249 uint32_t LastSliceOfPic : 1;
250 /** HEVC syntax element. */
251 uint32_t dependent_slice_segment_flag : 1;
252 /** HEVC syntax element. */
253 uint32_t slice_type : 2;
254 /** HEVC syntax element. */
255 uint32_t color_plane_id : 2;
256 /** HEVC syntax element. */
257 uint32_t slice_sao_luma_flag : 1;
258 /** HEVC syntax element. */
259 uint32_t slice_sao_chroma_flag : 1;
260 /** HEVC syntax element. */
261 uint32_t mvd_l1_zero_flag : 1;
262 /** HEVC syntax element. */
263 uint32_t cabac_init_flag : 1;
264 /** HEVC syntax element. */
265 uint32_t slice_temporal_mvp_enabled_flag : 1;
266 /** HEVC syntax element. */
267 uint32_t slice_deblocking_filter_disabled_flag : 1;
268 /** HEVC syntax element. */
269 uint32_t collocated_from_l0_flag : 1;
270 /** HEVC syntax element. */
271 uint32_t slice_loop_filter_across_slices_enabled_flag : 1;
272 uint32_t reserved : 18;
276 /** HEVC syntax element. Collocated Reference Picture Index.
277 * index to RefPicList[0][] or RefPicList[1][].
278 * when slice_temporal_mvp_enabled_flag equals 0, it should take value 0xFF.
279 * value range [0..14, 0xFF].
281 uint8_t collocated_ref_idx;
282 /** HEVC syntax element.
283 * if num_ref_idx_active_override_flag equals 0, host decoder should
284 * set its value to num_ref_idx_l0_default_active_minus1.
286 uint8_t num_ref_idx_l0_active_minus1;
287 /** HEVC syntax element.
288 * if num_ref_idx_active_override_flag equals 0, host decoder should
289 * set its value to num_ref_idx_l1_default_active_minus1.
291 uint8_t num_ref_idx_l1_active_minus1;
292 /** HEVC syntax element. */
293 int8_t slice_qp_delta;
294 /** HEVC syntax element. */
295 int8_t slice_cb_qp_offset;
296 /** HEVC syntax element. */
297 int8_t slice_cr_qp_offset;
298 /** HEVC syntax element. */
299 int8_t slice_beta_offset_div2;
300 /** HEVC syntax element. */
301 int8_t slice_tc_offset_div2;
302 /** HEVC syntax element. */
303 uint8_t luma_log2_weight_denom;
304 /** HEVC syntax element. */
305 int8_t delta_chroma_log2_weight_denom;
306 /** HEVC syntax element. */
307 int8_t delta_luma_weight_l0[15];
308 /** HEVC syntax element. */
309 int8_t luma_offset_l0[15];
310 /** HEVC syntax element. */
311 int8_t delta_chroma_weight_l0[15][2];
312 /** corresponds to HEVC spec variable of the same name. */
313 int8_t ChromaOffsetL0[15][2];
314 /** HEVC syntax element. */
315 int8_t delta_luma_weight_l1[15];
316 /** HEVC syntax element. */
317 int8_t luma_offset_l1[15];
318 /** HEVC syntax element. */
319 int8_t delta_chroma_weight_l1[15][2];
320 /** corresponds to HEVC spec variable of the same name. */
321 int8_t ChromaOffsetL1[15][2];
322 /** HEVC syntax element. */
323 uint8_t five_minus_max_num_merge_cand;
326 /** \brief Reserved bytes for future use, must be zero */
327 uint32_t va_reserved[VA_PADDING_LOW];
328 } VASliceParameterBufferHEVC;
333 * \brief HEVC Inverse Quantization Matrix Buffer Structure
335 * This structure is sent once per frame,
336 * and only when scaling_list_enabled_flag = 1.
337 * When sps_scaling_list_data_present_flag = 0, app still
338 * needs to send in this structure with default matrix values.
340 * Matrix entries are in raster scan order which follows HEVC spec.
342 typedef struct _VAIQMatrixBufferHEVC
345 * \brief scaling lists,
346 * corresponds to same HEVC spec syntax element
347 * ScalingList[ i ][ MatrixID ][ j ].
349 * \brief 4x4 scaling,
350 * correspongs i = 0, MatrixID is in the range of 0 to 5,
351 * inclusive. And j is in the range of 0 to 15, inclusive.
353 uint8_t ScalingList4x4[6][16];
355 * \brief 8x8 scaling,
356 * correspongs i = 1, MatrixID is in the range of 0 to 5,
357 * inclusive. And j is in the range of 0 to 63, inclusive.
359 uint8_t ScalingList8x8[6][64];
361 * \brief 16x16 scaling,
362 * correspongs i = 2, MatrixID is in the range of 0 to 5,
363 * inclusive. And j is in the range of 0 to 63, inclusive.
365 uint8_t ScalingList16x16[6][64];
367 * \brief 32x32 scaling,
368 * correspongs i = 3, MatrixID is in the range of 0 to 1,
369 * inclusive. And j is in the range of 0 to 63, inclusive.
371 uint8_t ScalingList32x32[2][64];
373 * \brief DC values of the 16x16 scaling lists,
374 * corresponds to HEVC spec syntax
375 * scaling_list_dc_coef_minus8[ sizeID - 2 ][ matrixID ] + 8
376 * with sizeID = 2 and matrixID in the range of 0 to 5, inclusive.
378 uint8_t ScalingListDC16x16[6];
380 * \brief DC values of the 32x32 scaling lists,
381 * corresponds to HEVC spec syntax
382 * scaling_list_dc_coef_minus8[ sizeID - 2 ][ matrixID ] + 8
383 * with sizeID = 3 and matrixID in the range of 0 to 1, inclusive.
385 uint8_t ScalingListDC32x32[2];
387 /** \brief Reserved bytes for future use, must be zero */
388 uint32_t va_reserved[VA_PADDING_LOW];
389 } VAIQMatrixBufferHEVC;
398 #endif /* VA_DEC_HEVC_H */