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27 * \brief VP8 decoding API
29 * This file contains the \ref api_dec_vp8 "VP8 decoding API".
40 * \defgroup api_dec_vp8 VP8 decoding API
46 * \brief VPX Bool Coder Context structure
48 * This common structure is defined for potential sharing by other VP formats
51 typedef struct _VABoolCoderContextVPX
53 /* partition 0 "range" */
55 /* partition 0 "value" */
58 * 'partition 0 number of shifts before an output byte is available'
59 * it is the number of remaining bits in 'value' for decoding, range [0, 7].
63 } VABoolCoderContextVPX;
66 * \brief VP8 Decoding Picture Parameter Buffer Structure
68 * This structure conveys frame level parameters and should be sent once
72 typedef struct _VAPictureParameterBufferVP8
74 /* frame width in pixels */
76 /* frame height in pixels */
77 uint32_t frame_height;
79 /* specifies the "last" reference frame */
80 VASurfaceID last_ref_frame;
81 /* specifies the "golden" reference frame */
82 VASurfaceID golden_ref_frame;
83 /* specifies the "alternate" referrence frame */
84 VASurfaceID alt_ref_frame;
85 /* specifies the out-of-loop deblocked frame, not used currently */
86 VASurfaceID out_of_loop_frame;
90 /* same as key_frame in bitstream syntax, 0 means a key frame */
91 uint32_t key_frame : 1;
92 /* same as version in bitstream syntax */
94 /* same as segmentation_enabled in bitstream syntax */
95 uint32_t segmentation_enabled : 1;
96 /* same as update_mb_segmentation_map in bitstream syntax */
97 uint32_t update_mb_segmentation_map : 1;
98 /* same as update_segment_feature_data in bitstream syntax */
99 uint32_t update_segment_feature_data : 1;
100 /* same as filter_type in bitstream syntax */
101 uint32_t filter_type : 1;
102 /* same as sharpness_level in bitstream syntax */
103 uint32_t sharpness_level : 3;
104 /* same as loop_filter_adj_enable in bitstream syntax */
105 uint32_t loop_filter_adj_enable : 1;
106 /* same as mode_ref_lf_delta_update in bitstream syntax */
107 uint32_t mode_ref_lf_delta_update : 1;
108 /* same as sign_bias_golden in bitstream syntax */
109 uint32_t sign_bias_golden : 1;
110 /* same as sign_bias_alternate in bitstream syntax */
111 uint32_t sign_bias_alternate : 1;
112 /* same as mb_no_coeff_skip in bitstream syntax */
113 uint32_t mb_no_coeff_skip : 1;
114 /* flag to indicate that loop filter should be disabled */
115 uint32_t loop_filter_disable : 1;
121 * probabilities of the segment_id decoding tree and same as
122 * mb_segment_tree_probs in the spec.
124 uint8_t mb_segment_tree_probs[3];
126 /* Post-adjustment loop filter levels for the 4 segments */
127 uint8_t loop_filter_level[4];
128 /* loop filter deltas for reference frame based MB level adjustment */
129 int8_t loop_filter_deltas_ref_frame[4];
130 /* loop filter deltas for coding mode based MB level adjustment */
131 int8_t loop_filter_deltas_mode[4];
133 /* same as prob_skip_false in bitstream syntax */
134 uint8_t prob_skip_false;
135 /* same as prob_intra in bitstream syntax */
137 /* same as prob_last in bitstream syntax */
139 /* same as prob_gf in bitstream syntax */
143 * list of 4 probabilities of the luma intra prediction mode decoding
144 * tree and same as y_mode_probs in frame header
146 uint8_t y_mode_probs[4];
148 * list of 3 probabilities of the chroma intra prediction mode decoding
149 * tree and same as uv_mode_probs in frame header
151 uint8_t uv_mode_probs[3];
153 * updated mv decoding probabilities and same as mv_probs in
156 uint8_t mv_probs[2][19];
158 VABoolCoderContextVPX bool_coder_ctx;
160 /** \brief Reserved bytes for future use, must be zero */
161 uint32_t va_reserved[VA_PADDING_LOW];
162 } VAPictureParameterBufferVP8;
165 * \brief VP8 Slice Parameter Buffer Structure
167 * This structure conveys parameters related to data partitions and should be
168 * sent once per frame. Slice data buffer of VASliceDataBufferType is used
169 * to send the partition data.
172 typedef struct _VASliceParameterBufferVP8
175 * number of bytes in the slice data buffer for the partitions
177 uint32_t slice_data_size;
179 * offset to the first byte of partition data (control partition)
181 uint32_t slice_data_offset;
183 * see VA_SLICE_DATA_FLAG_XXX definitions
185 uint32_t slice_data_flag;
187 * offset to the first bit of MB from the first byte of partition data(slice_data_offset)
189 uint32_t macroblock_offset;
193 * (1<<log2_nbr_of_dct_partitions)+1, count both control partition (frame header) and toke partition
195 uint8_t num_of_partitions;
197 * partition_size[0] is remaining bytes of control partition after parsed by application.
198 * exclude current byte for the remaining bits in bool_coder_ctx.
199 * exclude the uncompress data chunk since first_part_size 'excluding the uncompressed data chunk'
201 uint32_t partition_size[9];
203 /** \brief Reserved bytes for future use, must be zero */
204 uint32_t va_reserved[VA_PADDING_LOW];
205 } VASliceParameterBufferVP8;
208 * \brief VP8 Coefficient Probability Data Buffer Structure
210 * Contains the contents of the token probability table, which may be
211 * incrementally modified in the frame header. There are four dimensions to
212 * the token probability array. The outermost dimension is indexed by the
213 * type of plane being decoded; the next dimension is selected by the
214 * position of the coefficient being decoded; the third dimension, * roughly
215 * speaking, measures the "local complexity" or extent to which nearby
216 * coefficients are non-zero; the fourth, and final, dimension of the token
217 * probability array is indexed by the position in the token tree structure,
218 * as are all tree probability arrays. This structure is sent once per frame.
221 typedef struct _VAProbabilityDataBufferVP8
223 uint8_t dct_coeff_probs[4][8][3][11];
225 /** \brief Reserved bytes for future use, must be zero */
226 uint32_t va_reserved[VA_PADDING_LOW];
227 } VAProbabilityDataBufferVP8;
230 * \brief VP8 Inverse Quantization Matrix Buffer Structure
232 * Contains quantization indices for yac(0),ydc(1),y2dc(2),y2ac(3),uvdc(4),
233 * uvac(5) for each segment (0-3). When segmentation is disabled, only
234 * quantization_index[0][] will be used. This structure is sent once per frame.
236 typedef struct _VAIQMatrixBufferVP8
239 * array first dimensional is segment and 2nd dimensional is Q index
240 * all Q indexs should be clipped to be range [0, 127]
242 uint16_t quantization_index[4][6];
244 /** \brief Reserved bytes for future use, must be zero */
245 uint32_t va_reserved[VA_PADDING_LOW];
246 } VAIQMatrixBufferVP8;
254 #endif /* VA_DEC_VP8_H */