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27 * \brief VP9 encoding API
29 * This file contains the \ref api_enc_vp9 "VP9 encoding API".
41 * \defgroup api_enc_vp9 VP9 encoding API
47 * \brief VP9 Encoding Status Data Buffer Structure
49 * This structure is used to convey status data from encoder to application.
50 * Driver allocates VACodedBufferVP9Status as a private data buffer.
51 * Driver encapsulates the status buffer with a VACodedBufferSegment,
52 * and sets VACodedBufferSegment.status to be VA_CODED_BUF_STATUS_CODEC_SPECIFIC.
53 * And driver associates status data segment to the bit stream buffer segment
54 * by setting VACodedBufferSegment.next of coded_buf (bit stream) to the private
55 * buffer segment of status data.
56 * Application accesses it by calling VAMapBuffer() with VAEncCodedBufferType.
58 typedef struct _VACodedBufferVP9Status
60 /** Final quantization index used (yac), determined by BRC.
61 * Application is providing quantization index deltas
62 * ydc(0), y2dc(1), y2ac(2), uvdc(3), uvac(4) that are applied to all segments
63 * and segmentation qi deltas, they will not be changed by BRC.
65 uint16_t base_qp_index;
67 /** Final loopfilter levels for the frame, if segmentation is disabled only
69 * If loop_filter_level is 0, it indicates loop filter is disabled.
71 uint8_t loop_filter_level;
74 * Long term reference frame indication from BRC. BRC recommends the
75 * current frame that is being queried is a good candidate for a long
78 uint8_t long_term_indication;
80 /* suggested next frame width */
81 uint16_t next_frame_width;
83 /* suggested next frame height */
84 uint16_t next_frame_height;
86 } VACodedBufferVP9Status;
89 * \brief VP9 Encoding Sequence Parameter Buffer Structure
91 * This structure conveys sequence level parameters.
94 typedef struct _VAEncSequenceParameterBufferVP9
96 /** \brief Frame size note:
97 * Picture resolution may change frame by frame.
98 * Application needs to allocate surfaces and frame buffers based on
99 * max frame resolution in case resolution changes for later frames.
100 * The source and recon surfaces allocated should be 64x64(SB) aligned
101 * on both horizontal and vertical directions.
102 * But buffers on the surfaces need to be aligned to CU boundaries.
104 /* maximum frame width in pixels for the whole sequence */
105 uint32_t max_frame_width;
107 /* maximum frame height in pixels for the whole sequence */
108 uint32_t max_frame_height;
110 /* auto keyframe placement, non-zero means enable auto keyframe placement */
113 /* keyframe minimum interval */
114 uint32_t kf_min_dist;
116 /* keyframe maximum interval */
117 uint32_t kf_max_dist;
120 /* RC related fields. RC modes are set with VAConfigAttribRateControl */
121 /* For VP9, CBR implies HRD conformance and VBR implies no HRD conformance */
124 * Initial bitrate set for this sequence in CBR or VBR modes.
126 * This field represents the initial bitrate value for this
127 * sequence if CBR or VBR mode is used, i.e. if the encoder
128 * pipeline was created with a #VAConfigAttribRateControl
129 * attribute set to either \ref VA_RC_CBR or \ref VA_RC_VBR.
131 * The bitrate can be modified later on through
132 * #VAEncMiscParameterRateControl buffers.
134 uint32_t bits_per_second;
136 /* Period between key frames */
137 uint32_t intra_period;
139 } VAEncSequenceParameterBufferVP9;
143 * \brief VP9 Encoding Picture Parameter Buffer Structure
145 * This structure conveys picture level parameters.
148 typedef struct _VAEncPictureParameterBufferVP9
150 /** VP9 encoder may support dynamic scaling function.
151 * If enabled (enable_dynamic_scaling is set), application may request
152 * GPU encodes picture with a different resolution from the raw source.
153 * GPU should handle the scaling process of source and
154 * all reference frames.
156 /* raw source frame width in pixels */
157 uint32_t frame_width_src;
158 /* raw source frame height in pixels */
159 uint32_t frame_height_src;
161 /* to be encoded frame width in pixels */
162 uint32_t frame_width_dst;
163 /* to be encoded frame height in pixels */
164 uint32_t frame_height_dst;
166 /* surface to store reconstructed frame, not used for enc only case */
167 VASurfaceID reconstructed_frame;
169 /** \brief reference frame buffers
170 * Each entry of the array specifies the surface index of the picture
171 * that is referred by current picture or will be referred by any future
172 * picture. The valid entries take value from 0 to 127, inclusive.
173 * Non-valid entries, those do not point to pictures which are referred
174 * by current picture or future pictures, should take value 0xFF.
175 * Other values are not allowed.
177 * Application should update this array based on the refreshing
178 * information expected.
180 VASurfaceID reference_frames[8];
182 /* buffer to store coded data */
183 VABufferID coded_buf;
187 /* force this frame to be a keyframe */
188 uint32_t force_kf : 1;
190 /** \brief Indiates which frames to be used as reference.
191 * (Ref_frame_ctrl & 0x01) ? 1: last frame as reference frame, 0: not.
192 * (Ref_frame_ctrl & 0x02) ? 1: golden frame as reference frame, 0: not.
193 * (Ref_frame_ctrl & 0x04) ? 1: alt frame as reference frame, 0: not.
194 * L0 is for forward prediction.
195 * L1 is for backward prediction.
197 uint32_t ref_frame_ctrl_l0 : 3;
198 uint32_t ref_frame_ctrl_l1 : 3;
200 /** \brief Last Reference Frame index
201 * Specifies the index to RefFrameList[] which points to the LAST
202 * reference frame. It corresponds to active_ref_idx[0] in VP9 code.
204 uint32_t ref_last_idx : 3;
206 /** \brief Specifies the Sign Bias of the LAST reference frame.
207 * It corresponds to ref_frame_sign_bias[LAST_FRAME] in VP9 code.
209 uint32_t ref_last_sign_bias : 1;
211 /** \brief GOLDEN Reference Frame index
212 * Specifies the index to RefFrameList[] which points to the Golden
213 * reference frame. It corresponds to active_ref_idx[1] in VP9 code.
215 uint32_t ref_gf_idx : 3;
217 /** \brief Specifies the Sign Bias of the GOLDEN reference frame.
218 * It corresponds to ref_frame_sign_bias[GOLDEN_FRAME] in VP9 code.
220 uint32_t ref_gf_sign_bias : 1;
222 /** \brief Alternate Reference Frame index
223 * Specifies the index to RefFrameList[] which points to the Alternate
224 * reference frame. It corresponds to active_ref_idx[2] in VP9 code.
226 uint32_t ref_arf_idx : 3;
228 /** \brief Specifies the Sign Bias of the ALTERNATE reference frame.
229 * It corresponds to ref_frame_sign_bias[ALTREF_FRAME] in VP9 code.
231 uint32_t ref_arf_sign_bias : 1;
233 /* The temporal id the frame belongs to */
234 uint32_t temporal_id : 8;
236 uint32_t reserved : 5;
244 * Indicates if the current frame is a key frame or not.
245 * Corresponds to the same VP9 syntax element in frame tag.
247 uint32_t frame_type : 1;
249 /** \brief show_frame
250 * 0: current frame is not for display
251 * 1: current frame is for display
253 uint32_t show_frame : 1;
256 * The following fields correspond to the same VP9 syntax elements
257 * in the frame header.
259 uint32_t error_resilient_mode : 1;
261 /** \brief Indicate intra-only for inter pictures.
262 * Must be 0 for key frames.
263 * 0: inter frame use both intra and inter blocks
264 * 1: inter frame use only intra blocks.
266 uint32_t intra_only : 1;
268 /** \brief Indicate high precision mode for Motion Vector prediction
270 * 1: high precision mode
272 uint32_t allow_high_precision_mv : 1;
274 /** \brief Motion Compensation Filter type
275 * 0: eight-tap (only this mode is supported now.)
276 * 1: eight-tap-smooth
281 uint32_t mcomp_filter_type : 3;
282 uint32_t frame_parallel_decoding_mode : 1;
283 uint32_t reset_frame_context : 2;
284 uint32_t refresh_frame_context : 1;
285 uint32_t frame_context_idx : 2;
286 uint32_t segmentation_enabled : 1;
288 /* corresponds to variable temporal_update in VP9 code.
289 * Indicates whether Segment ID is from bitstream or from previous
291 * 0: Segment ID from bitstream
292 * 1: Segment ID from previous frame
294 uint32_t segmentation_temporal_update : 1;
296 /* corresponds to variable update_mb_segmentation_map in VP9 code.
297 * Indicates how hardware determines segmentation ID
298 * 0: intra block - segment id is 0;
299 * inter block - segment id from previous frame
300 * 1: intra block - segment id from bitstream (app or GPU decides)
301 * inter block - depends on segmentation_temporal_update
303 uint32_t segmentation_update_map : 1;
305 /** \brief Specifies if the picture is coded in lossless mode.
307 * lossless_mode = base_qindex == 0 && y_dc_delta_q == 0 \
308 * && uv_dc_delta_q == 0 && uv_ac_delta_q == 0;
309 * Where base_qindex, y_dc_delta_q, uv_dc_delta_q and uv_ac_delta_q
310 * are all variables in VP9 code.
312 * When enabled, tx_mode needs to be set to 4x4 only and all
313 * tu_size in CU record set to 4x4 for entire frame.
314 * Software also has to program such that final_qindex=0 and
315 * final_filter_level=0 following the Quant Scale and
316 * Filter Level Table in Segmentation State section.
317 * Hardware forces Hadamard Tx when this bit is set.
318 * When lossless_mode is on, BRC has to be turned off.
322 uint32_t lossless_mode : 1;
324 /** \brief MV prediction mode. Corresponds to VP9 variable with same name.
325 * comp_prediction_mode = 0: single prediction ony,
326 * comp_prediction_mode = 1: compound prediction,
327 * comp_prediction_mode = 2: hybrid prediction
329 * Not mandatory. App may suggest the setting based on power or
330 * performance. Kernal may use it as a guildline and decide the proper
331 * setting on its own.
333 uint32_t comp_prediction_mode : 2;
335 /** \brief Indicate how segmentation is specified
336 * 0 application specifies segmentation partitioning and
337 * relevant parameters.
338 * 1 GPU may decide on segmentation. If application already
339 * provides segmentation information, GPU may choose to
340 * honor it and further split into more levels if possible.
342 uint32_t auto_segmentation : 1;
344 /** \brief Indicate super frame syntax should be inserted
345 * 0 current frame is not encapsulated in super frame structure
346 * 1 current fame is to be encapsulated in super frame structure.
347 * super frame index syntax will be inserted by encoder at
348 * the end of current frame.
350 uint32_t super_frame_flag : 1;
352 uint32_t reserved : 10;
357 /** \brief indicate which frames in DPB should be refreshed.
358 * same syntax and semantic as in VP9 code.
360 uint8_t refresh_frame_flags;
362 /** \brief Base Q index in the VP9 term.
363 * Added with per segment delta Q index to get Q index of Luma AC.
365 uint8_t luma_ac_qindex;
368 * Q index delta from base Q index in the VP9 term for Luma DC.
370 int8_t luma_dc_qindex_delta;
373 * Q index delta from base Q index in the VP9 term for Chroma AC.
375 int8_t chroma_ac_qindex_delta;
378 * Q index delta from base Q index in the VP9 term for Chroma DC.
380 int8_t chroma_dc_qindex_delta;
382 /** \brief filter level
383 * Corresponds to the same VP9 syntax element in frame header.
385 uint8_t filter_level;
388 * Controls the deblocking filter sensitivity.
389 * Corresponds to the same VP9 syntax element in frame header.
391 uint8_t sharpness_level;
393 /** \brief Loop filter level reference delta values.
394 * Contains a list of 4 delta values for reference frame based block-level
395 * loop filter adjustment.
396 * If no update, set to 0.
397 * value range [-63..63]
399 int8_t ref_lf_delta[4];
401 /** \brief Loop filter level mode delta values.
402 * Contains a list of 4 delta values for coding mode based MB-level loop
404 * If no update, set to 0.
405 * value range [-63..63]
407 int8_t mode_lf_delta[2];
410 * Offset from starting position of output bitstream in bits where
411 * ref_lf_delta[] should be inserted. This offset should cover any metadata
412 * ahead of uncompressed header in inserted bit stream buffer (the offset
413 * should be same as that for final output bitstream buffer).
415 * In BRC mode, always insert ref_lf_delta[] (This implies uncompressed
416 * header should have mode_ref_delta_enabled=1 and mode_ref_delta_update=1).
418 uint16_t bit_offset_ref_lf_delta;
421 * Offset from starting position of output bitstream in bits where
422 * mode_lf_delta[] should be inserted.
424 * In BRC mode, always insert mode_lf_delta[] (This implies uncompressed
425 * header should have mode_ref_delta_enabled=1 and mode_ref_delta_update=1).
427 uint16_t bit_offset_mode_lf_delta;
430 * Offset from starting position of output bitstream in bits where (loop)
431 * filter_level should be inserted.
433 uint16_t bit_offset_lf_level;
436 * Offset from starting position of output bitstream in bits where
437 * Base Qindex should be inserted.
439 uint16_t bit_offset_qindex;
442 * Offset from starting position of output bitstream in bits where
443 * First Partition Size should be inserted.
445 uint16_t bit_offset_first_partition_size;
448 * Offset from starting position of output bitstream in bits where
449 * segmentation_enabled is located in bitstream. When auto_segmentation
450 * is enabled, GPU uses this offset to locate and update the
451 * segmentation related information.
453 uint16_t bit_offset_segmentation;
455 /** \brief length in bit of segmentation portion from the location
456 * in bit stream where segmentation_enabled syntax is coded.
457 * When auto_segmentation is enabled, GPU uses this bit size to locate
458 * and update the information after segmentation.
460 uint16_t bit_size_segmentation;
463 /** \brief log2 of number of tile rows
464 * Corresponds to the same VP9 syntax element in frame header.
467 uint8_t log2_tile_rows;
469 /** \brief log2 of number of tile columns
470 * Corresponds to the same VP9 syntax element in frame header.
473 uint8_t log2_tile_columns;
475 /** \brief indicate frame-skip happens
476 * Application may choose to drop/skip one or mulitple encoded frames or
477 * to-be-encoded frame due to various reasons such as insufficient
479 * Application uses the following three flags to inform GPU about frame-skip.
481 * value range of skip_frame_flag: [0..2]
482 * 0 - encode as normal, no skip;
483 * 1 - one or more frames were skipped by application prior to the
484 * current frame. Encode the current frame as normal. The driver
485 * will pass the number_skip_frames and skip_frames_size
486 * to bit rate control for adjustment.
487 * 2 - the current frame is to be skipped. Do not encode it but encrypt
488 * the packed header contents. This is for the secure encoding case
489 * where application generates a frame of all skipped blocks.
490 * The packed header will contain the skipped frame.
492 uint8_t skip_frame_flag;
494 /** \brief The number of frames skipped prior to the current frame.
495 * It includes only the skipped frames that were not counted before,
496 * and does not include the frame with skip_frame_flag == 2.
497 * Valid when skip_frame_flag = 1.
499 uint8_t number_skip_frames;
501 /** \brief When skip_frame_flag = 1, the size of the skipped frames in bits.
502 * It includes only the skipped frames that were not counted before,
503 * and does not include the frame size with skip_frame_flag = 2.
504 * When skip_frame_flag = 2, it is the size of the current skipped frame
505 * that is to be encrypted.
507 uint32_t skip_frames_size;
509 } VAEncPictureParameterBufferVP9;
513 * \brief Per segment parameters
515 typedef struct _VAEncSegParamVP9
519 /** \brief Indicates if per segment reference frame indicator is enabled.
520 * Corresponding to variable feature_enabled when
521 * j == SEG_LVL_REF_FRAME in function setup_segmentation() VP9 code.
523 uint8_t segment_reference_enabled : 1;
525 /** \brief Specifies per segment reference indication.
530 * Value can be derived from variable data when
531 * j == SEG_LVL_REF_FRAME in function setup_segmentation() VP9 code.
532 * value range: [0..3]
534 uint8_t segment_reference : 2;
536 /** \brief Indicates if per segment skip mode is enabled.
537 * Corresponding to variable feature_enabled when
538 * j == SEG_LVL_SKIP in function setup_segmentation() VP9 code.
540 uint8_t segment_reference_skipped : 1;
542 uint8_t reserved : 4;
548 /** \brief Specifies per segment Loop Filter Delta.
549 * Must be 0 when segmentation_enabled == 0.
550 * value range: [-63..63]
552 int8_t segment_lf_level_delta;
554 /** \brief Specifies per segment QIndex Delta.
555 * Must be 0 when segmentation_enabled == 0.
556 * value range: [-255..255]
558 int16_t segment_qindex_delta;
563 * Structure to convey all segment related information.
564 * If segmentation is disabled, this data structure is still required.
565 * In this case, only seg_data[0] contains valid data.
566 * This buffer is sent once per frame.
568 * The buffer is created with VABufferType VAQMatrixBufferType.
571 typedef struct _VAEncMiscParameterTypeVP9PerSegmantParam
574 * Parameters for 8 segments.
576 VAEncSegParamVP9 seg_data[8];
578 } VAEncMiscParameterTypeVP9PerSegmantParam;
582 * \brief VP9 Block Segmentation ID Buffer
584 * The application provides a buffer of VAEncMacroblockMapBufferType containing
585 * the initial segmentation id for each 8x8 block, one byte each, in raster scan order.
586 * Rate control may reassign it. For example, a 640x480 video, the buffer has 4800 entries.
587 * The value of each entry should be in the range [0..7], inclusive.
588 * If segmentation is not enabled, the application does not need to provide it.
598 #endif /* VA_ENC_VP9_H */