third_party/libva/va/va_enc_h264.h

   1 /*
   2  * Copyright (c) 2007-2011 Intel Corporation. All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sub license, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the
  13  * next paragraph) shall be included in all copies or substantial portions
  14  * of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  19  * IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE LIABLE FOR
  20  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  21  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  22  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file va_enc_h264.h
  27  * \brief The H.264 encoding API
  28  *
  29  * This file contains the \ref api_enc_h264 "H.264 encoding API".
  30  */
  31
  32 #ifndef VA_ENC_H264_H
  33 #define VA_ENC_H264_H
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /**
  40  * \defgroup api_enc_h264 H.264 encoding API
  41  *
  42  * @{
  43  */
  44
  45 /**
  46  * @name Picture flags
  47  *
  48  * Those flags flags are meant to signal when a picture marks the end
  49  * of a sequence, a stream, or even both at once.
  50  *
  51  * @{
  52  */
  53 /**
  54  * \brief Marks the last picture in the sequence.
  55  *
  56  * i.e. the driver appends \c end_of_seq() NAL unit to the encoded frame.
  57  */
  58 #define H264_LAST_PICTURE_EOSEQ     0x01
  59 /**
  60  * \brief Marks the last picture in the stream.
  61  *
  62  * i.e. the driver appends \c end_of_stream() NAL unit to the encoded frame.
  63  */
  64 #define H264_LAST_PICTURE_EOSTREAM  0x02
  65 /**@}*/
  66
  67 /**
  68  * \brief Packed header types specific to H.264 encoding.
  69  *
  70  * Types of packed headers generally used for H.264 encoding. Each
  71  * associated packed header data buffer shall contain the start code
  72  * prefix 0x000001 followed by the complete NAL unit, thus also
  73  * including the \c nal_unit_type.
  74  *
  75  * Note: the start code prefix can contain an arbitrary number of leading
  76  * zeros. The driver will skip them for emulation prevention bytes insertion,
  77  * if necessary.
  78  */
  79 typedef enum {
  80     /**
  81      * \brief Packed Sequence Parameter Set (SPS).
  82      *
  83      * The corresponding packed header data buffer shall contain the
  84      * complete seq_parameter_set_rbsp() syntax element.
  85      *
  86      * Note: packed \c nal_unit_type shall be equal to 7.
  87      */
  88     VAEncPackedHeaderH264_SPS   = VAEncPackedHeaderSequence,
  89     /**
  90      * \brief Packed Picture Parameter Set (PPS).
  91      *
  92      * The corresponding packed header data buffer shall contain the
  93      * complete pic_parameter_set_rbsp() syntax element.
  94      *
  95      * Note: packed \c nal_unit_type shall be equal to 8.
  96      */
  97     VAEncPackedHeaderH264_PPS   = VAEncPackedHeaderPicture,
  98     /**
  99      * \brief Packed slice header.
 100      *
 101      * The corresponding packed header data buffer shall contain the
 102      * \c slice_header() syntax element only, along with any start
 103      * code prefix and NAL unit type preceeding it. i.e. this means
 104      * that the buffer does not contain any of the \c slice_data() or
 105      * the \c rbsp_slice_trailing_bits().
 106      *
 107      * Note: packed \c nal_unit_type shall be equal to 1 (non-IDR
 108      * picture), or 5 (IDR picture).
 109      */
 110     VAEncPackedHeaderH264_Slice = VAEncPackedHeaderSlice,
 111     /**
 112      * \brief Packed Supplemental Enhancement Information (SEI).
 113      *
 114      * The corresponding packed header data buffer shall contain the
 115      * complete sei_rbsp() syntax element, thus including several
 116      * sei_message() elements if necessary.
 117      *
 118      * Note: packed \c nal_unit_type shall be equal to 6.
 119      */
 120     VAEncPackedHeaderH264_SEI   = (VAEncPackedHeaderMiscMask | 1),
 121 } VAEncPackedHeaderTypeH264;
 122
 123 /**
 124  * \brief Sequence parameter for H.264 encoding in baseline, main & high
 125  * profiles.
 126  *
 127  * This structure holds information for \c seq_parameter_set_data() as
 128  * defined by the H.264 specification.
 129  *
 130  * If packed sequence headers mode is used, i.e. if the encoding
 131  * pipeline was configured with the #VA_ENC_PACKED_HEADER_SEQUENCE
 132  * flag, then the driver expects two more buffers to be provided to
 133  * the same \c vaRenderPicture() as this buffer:
 134  * - a #VAEncPackedHeaderParameterBuffer with type set to
 135  *   VAEncPackedHeaderType::VAEncPackedHeaderSequence ;
 136  * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
 137  *   header data.
 138  *
 139  * If \c seq_scaling_matrix_present_flag is set to \c 1, then a
 140  * #VAIQMatrixBufferH264 buffer shall also be provided within the same
 141  * \c vaRenderPicture() call as this sequence parameter buffer.
 142  */
 143 typedef struct _VAEncSequenceParameterBufferH264 {
 144     /** \brief Same as the H.264 bitstream syntax element. */
 145     unsigned char   seq_parameter_set_id;
 146     /** \brief Same as the H.264 bitstream syntax element. */
 147     unsigned char   level_idc;
 148     /** \brief Period between I frames. */
 149     unsigned int    intra_period;
 150     /** \brief Period between IDR frames. */
 151     unsigned int    intra_idr_period;
 152     /** \brief Period between I/P frames. */
 153     unsigned int    ip_period;
 154     /**
 155      * \brief Initial bitrate set for this sequence in CBR or VBR modes.
 156      *
 157      * This field represents the initial bitrate value for this
 158      * sequence if CBR or VBR mode is used, i.e. if the encoder
 159      * pipeline was created with a #VAConfigAttribRateControl
 160      * attribute set to either \ref VA_RC_CBR or \ref VA_RC_VBR.
 161      *
 162      * The bitrate can be modified later on through
 163      * #VAEncMiscParameterRateControl buffers.
 164      */
 165     unsigned int    bits_per_second;
 166     /** \brief Same as the H.264 bitstream syntax element. */
 167     unsigned int    max_num_ref_frames;
 168     /** \brief Picture width in macroblocks. */
 169     unsigned short  picture_width_in_mbs;
 170     /** \brief Picture height in macroblocks. */
 171     unsigned short  picture_height_in_mbs;
 172
 173     union {
 174         struct {
 175             /** \brief Same as the H.264 bitstream syntax element. */
 176             unsigned int chroma_format_idc                      : 2;
 177             /** \brief Same as the H.264 bitstream syntax element. */
 178             unsigned int frame_mbs_only_flag                    : 1;
 179             /** \brief Same as the H.264 bitstream syntax element. */
 180             unsigned int mb_adaptive_frame_field_flag           : 1;
 181             /** \brief Same as the H.264 bitstream syntax element. */
 182             unsigned int seq_scaling_matrix_present_flag        : 1;
 183             /** \brief Same as the H.264 bitstream syntax element. */
 184             unsigned int direct_8x8_inference_flag              : 1;
 185             /** \brief Same as the H.264 bitstream syntax element. */
 186             unsigned int log2_max_frame_num_minus4              : 4;
 187             /** \brief Same as the H.264 bitstream syntax element. */
 188             unsigned int pic_order_cnt_type                     : 2;
 189             /** \brief Same as the H.264 bitstream syntax element. */
 190             unsigned int log2_max_pic_order_cnt_lsb_minus4      : 4;
 191             /** \brief Same as the H.264 bitstream syntax element. */
 192             unsigned int delta_pic_order_always_zero_flag       : 1;
 193         } bits;
 194         unsigned int value;
 195     } seq_fields;
 196
 197     /** \brief Same as the H.264 bitstream syntax element. */
 198     unsigned char   bit_depth_luma_minus8;
 199     /** \brief Same as the H.264 bitstream syntax element. */
 200     unsigned char   bit_depth_chroma_minus8;
 201
 202     /** if pic_order_cnt_type == 1 */
 203     /**@{*/
 204     /** \brief Same as the H.264 bitstream syntax element. */
 205     unsigned char   num_ref_frames_in_pic_order_cnt_cycle;
 206     /** \brief Same as the H.264 bitstream syntax element. */
 207     int             offset_for_non_ref_pic;
 208     /** \brief Same as the H.264 bitstream syntax element. */
 209     int             offset_for_top_to_bottom_field;
 210     /** \brief Same as the H.264 bitstream syntax element. */
 211     int             offset_for_ref_frame[256];
 212     /**@}*/
 213
 214     /** @name Cropping (optional) */
 215     /**@{*/
 216     /** \brief Same as the H.264 bitstream syntax element. */
 217     unsigned char   frame_cropping_flag;
 218     /** \brief Same as the H.264 bitstream syntax element. */
 219     unsigned int    frame_crop_left_offset;
 220     /** \brief Same as the H.264 bitstream syntax element. */
 221     unsigned int    frame_crop_right_offset;
 222     /** \brief Same as the H.264 bitstream syntax element. */
 223     unsigned int    frame_crop_top_offset;
 224     /** \brief Same as the H.264 bitstream syntax element. */
 225     unsigned int    frame_crop_bottom_offset;
 226     /**@}*/
 227
 228     /** @name VUI parameters (optional) */
 229     /**@{*/
 230     /** \brief Same as the H.264 bitstream syntax element. */
 231     unsigned char   vui_parameters_present_flag;
 232     union {
 233         struct {
 234             /** \brief Same as the H.264 bitstream syntax element. */
 235             unsigned int aspect_ratio_info_present_flag         : 1;
 236             /** \brief Same as the H.264 bitstream syntax element. */
 237             unsigned int timing_info_present_flag               : 1;
 238             /** \brief Same as the H.264 bitstream syntax element. */
 239             unsigned int bitstream_restriction_flag             : 1;
 240             /** \brief Range: 0 to 16, inclusive. */
 241             unsigned int log2_max_mv_length_horizontal          : 5;
 242             /** \brief Range: 0 to 16, inclusive. */
 243             unsigned int log2_max_mv_length_vertical            : 5;
 244         } bits;
 245         unsigned int value;
 246     } vui_fields;
 247     /** \brief Same as the H.264 bitstream syntax element. */
 248     unsigned char   aspect_ratio_idc;
 249     /** \brief Same as the H.264 bitstream syntax element. */
 250     unsigned int    sar_width;
 251     /** \brief Same as the H.264 bitstream syntax element. */
 252     unsigned int    sar_height;
 253     /** \brief Same as the H.264 bitstream syntax element. */
 254     unsigned int    num_units_in_tick;
 255     /** \brief Same as the H.264 bitstream syntax element. */
 256     unsigned int    time_scale;
 257     /**@}*/
 258 } VAEncSequenceParameterBufferH264;
 259
 260 /**
 261  * \brief Picture parameter for H.264 encoding in baseline, main & high
 262  * profiles.
 263  *
 264  * This structure holds information for \c pic_parameter_set_rbsp() as
 265  * defined by the H.264 specification.
 266  *
 267  * If packed picture headers mode is used, i.e. if the encoding
 268  * pipeline was configured with the #VA_ENC_PACKED_HEADER_PICTURE
 269  * flag, then the driver expects two more buffers to be provided to
 270  * the same \c vaRenderPicture() as this buffer:
 271  * - a #VAEncPackedHeaderParameterBuffer with type set to
 272  *   VAEncPackedHeaderType::VAEncPackedHeaderPicture ;
 273  * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
 274  *   header data.
 275  *
 276  * If \c pic_scaling_matrix_present_flag is set to \c 1, then a
 277  * #VAIQMatrixBufferH264 buffer shall also be provided within the same
 278  * \c vaRenderPicture() call as this picture parameter buffer.
 279  */
 280 typedef struct _VAEncPictureParameterBufferH264 {
 281     /**
 282      * \brief Information about the picture to be encoded.
 283      *
 284      * See #VAPictureH264 for further description of each field.
 285      * Note that CurrPic.picture_id represents the reconstructed
 286      * (decoded) picture. User provides a scratch VA surface ID here.
 287      */
 288     VAPictureH264   CurrPic;
 289     /**
 290      * \brief Decoded Picture Buffer (DPB).
 291      *
 292      * This array represents the list of reconstructed (decoded)
 293      * frames used as reference. It is important to keep track of
 294      * reconstructed frames so that they can be used later on as
 295      * reference for P or B-frames encoding.
 296      */
 297     VAPictureH264   ReferenceFrames[16];
 298     /**
 299      * \brief Output encoded bitstream.
 300      *
 301      * \ref coded_buf has type #VAEncCodedBufferType. It should be
 302      * large enough to hold the compressed NAL slice and possibly SPS
 303      * and PPS NAL units.
 304      */
 305     VABufferID      coded_buf;
 306
 307     /** \brief The picture parameter set referred to in the slice header. */
 308     unsigned char   pic_parameter_set_id;
 309     /** \brief The active sequence parameter set. Range: 0 to 31, inclusive. */
 310     unsigned char   seq_parameter_set_id;
 311
 312     /**
 313      * \brief OR'd flags describing whether the picture is the last one or not.
 314      *
 315      * This fields holds 0 if the picture to be encoded is not the last
 316      * one in the stream or sequence. Otherwise, it is a combination of
 317      * \ref H264_LAST_PICTURE_EOSEQ or \ref H264_LAST_PICTURE_EOSTREAM.
 318      */
 319     unsigned char   last_picture;
 320
 321     /** \brief The picture identifier.
 322      *   Range: 0 to \f$2^{log2\_max\_frame\_num\_minus4 + 4} - 1\f$, inclusive.
 323      */
 324     unsigned short  frame_num;
 325
 326     /** \brief \c pic_init_qp_minus26 + 26. */
 327     unsigned char   pic_init_qp;
 328     /** \brief Maximum reference index for reference picture list 0.
 329      *   Range: 0 to 31, inclusive.
 330      */
 331     unsigned char   num_ref_idx_l0_active_minus1;
 332     /** \brief Maximum reference index for reference picture list 1.
 333      *  Range: 0 to 31, inclusive.
 334      */
 335     unsigned char   num_ref_idx_l1_active_minus1;
 336
 337     /** \brief Range: -12 to 12, inclusive. */
 338     signed char     chroma_qp_index_offset;
 339     /** \brief Range: -12 to 12, inclusive. */
 340     signed char     second_chroma_qp_index_offset;
 341
 342     union {
 343         struct {
 344             /** \brief Is picture an IDR picture? */
 345             unsigned int idr_pic_flag                           : 1;
 346             /** \brief Is picture a reference picture? */
 347             unsigned int reference_pic_flag                     : 2;
 348             /** \brief Selects CAVLC (0) or CABAC (1) entropy coding mode. */
 349             unsigned int entropy_coding_mode_flag               : 1;
 350             /** \brief Is weighted prediction applied to P slices? */
 351             unsigned int weighted_pred_flag                     : 1;
 352             /** \brief Range: 0 to 2, inclusive. */
 353             unsigned int weighted_bipred_idc                    : 2;
 354             /** \brief Same as the H.264 bitstream syntax element. */
 355             unsigned int constrained_intra_pred_flag            : 1;
 356             /** \brief Same as the H.264 bitstream syntax element. */
 357             unsigned int transform_8x8_mode_flag                : 1;
 358             /** \brief Same as the H.264 bitstream syntax element. */
 359             unsigned int deblocking_filter_control_present_flag : 1;
 360             /** \brief Same as the H.264 bitstream syntax element. */
 361             unsigned int redundant_pic_cnt_present_flag         : 1;
 362             /** \brief Same as the H.264 bitstream syntax element. */
 363             unsigned int pic_order_present_flag                 : 1;
 364             /** \brief Same as the H.264 bitstream syntax element. */
 365             unsigned int pic_scaling_matrix_present_flag        : 1;
 366         } bits;
 367         unsigned int value;
 368     } pic_fields;
 369 } VAEncPictureParameterBufferH264;
 370
 371 /**
 372  * \brief Slice parameter for H.264 encoding in baseline, main & high profiles.
 373  *
 374  * This structure holds information for \c
 375  * slice_layer_without_partitioning_rbsp() as defined by the H.264
 376  * specification.
 377  *
 378  * If packed slice headers mode is used, i.e. if the encoding
 379  * pipeline was configured with the #VA_ENC_PACKED_HEADER_SLICE
 380  * flag, then the driver expects two more buffers to be provided to
 381  * the same \c vaRenderPicture() as this buffer:
 382  * - a #VAEncPackedHeaderParameterBuffer with type set to
 383  *   VAEncPackedHeaderType::VAEncPackedHeaderSlice ;
 384  * - a #VAEncPackedHeaderDataBuffer which holds the actual packed
 385  *   header data.
 386  *
 387  * If per-macroblock encoder configuration is needed, \c macroblock_info
 388  * references a buffer of type #VAEncMacroblockParameterBufferH264. This
 389  * buffer is not passed to vaRenderPicture(). i.e. it is not destroyed
 390  * by subsequent calls to vaRenderPicture() and then can be re-used
 391  * without re-allocating the whole buffer.
 392  */
 393 typedef struct _VAEncSliceParameterBufferH264 {
 394     /** \brief Starting MB address for this slice. */
 395     unsigned int    macroblock_address;
 396     /** \brief Number of macroblocks in this slice. */
 397     unsigned int    num_macroblocks;
 398     /**
 399      * \brief Per-MB encoder configuration buffer, or \c VA_INVALID_ID.
 400      *
 401      * If per-MB encoder configuration is needed, then \ref macroblock_info
 402      * references a buffer of type #VAEncMacroblockParameterBufferH264
 403      * (\c VAEncMacroblockParameterBufferType). Otherwise, buffer id
 404      * is set to \c VA_INVALID_ID and per-MB configuration is derived
 405      * from this slice parameter.
 406      *
 407      * The \c macroblock_info buffer must hold \ref num_macroblocks
 408      * elements.
 409      */
 410     VABufferID      macroblock_info;
 411     /** \brief Slice type.
 412      *  Range: 0..2, 5..7, i.e. no switching slices.
 413      */
 414     unsigned char   slice_type;
 415     /** \brief Same as the H.264 bitstream syntax element. */
 416     unsigned char   pic_parameter_set_id;
 417     /** \brief Same as the H.264 bitstream syntax element. */
 418     unsigned short  idr_pic_id;
 419
 420     /** @name If pic_order_cnt_type == 0 */
 421     /**@{*/
 422     /** \brief The picture order count modulo MaxPicOrderCntLsb. */
 423     unsigned short  pic_order_cnt_lsb;
 424     /** \brief Valid if \c pic_order_present_flag and this is a bottom field. */
 425     int             delta_pic_order_cnt_bottom;
 426     /**@}*/
 427     /** @name If pic_order_cnt_type == 1 && !delta_pic_order_always_zero_flag */
 428     /**@{*/
 429     /** \brief [0]: top, [1]: bottom. */
 430     int             delta_pic_order_cnt[2];
 431     /**@}*/
 432
 433     /** @name If slice_type == B */
 434     /**@{*/
 435     unsigned char   direct_spatial_mv_pred_flag;
 436     /**@}*/
 437
 438     /** @name If slice_type == P */
 439     /**@{*/
 440     /** \brief Specifies if
 441      * \ref _VAEncPictureParameterBufferH264::num_ref_idx_l0_active_minus1 or
 442      * \ref _VAEncPictureParameterBufferH264::num_ref_idx_l1_active_minus1 are
 443      * overriden by the values for this slice.
 444      */
 445     unsigned char   num_ref_idx_active_override_flag;
 446     /** \brief Maximum reference index for reference picture list 0.
 447      *  Range: 0 to 31, inclusive.
 448      */
 449     unsigned char   num_ref_idx_l0_active_minus1;
 450     /** \brief Maximum reference index for reference picture list 1.
 451      *  Range: 0 to 31, inclusive.
 452      */
 453     unsigned char   num_ref_idx_l1_active_minus1;
 454     /** \brief Reference picture list 0 (for P slices). */
 455     VAPictureH264   RefPicList0[32];
 456     /** \brief Reference picture list 1 (for B slices). */
 457     VAPictureH264   RefPicList1[32];
 458     /**@}*/
 459
 460     /** @name pred_weight_table() */
 461     /**@{*/
 462     /** \brief Same as the H.264 bitstream syntax element. */
 463     unsigned char   luma_log2_weight_denom;
 464     /** \brief Same as the H.264 bitstream syntax element. */
 465     unsigned char   chroma_log2_weight_denom;
 466     /** \brief Same as the H.264 bitstream syntax element. */
 467     unsigned char   luma_weight_l0_flag;
 468     /** \brief Same as the H.264 bitstream syntax element. */
 469     signed short    luma_weight_l0[32];
 470     /** \brief Same as the H.264 bitstream syntax element. */
 471     signed short    luma_offset_l0[32];
 472     /** \brief Same as the H.264 bitstream syntax element. */
 473     unsigned char   chroma_weight_l0_flag;
 474     /** \brief Same as the H.264 bitstream syntax element. */
 475     signed short    chroma_weight_l0[32][2];
 476     /** \brief Same as the H.264 bitstream syntax element. */
 477     signed short    chroma_offset_l0[32][2];
 478     /** \brief Same as the H.264 bitstream syntax element. */
 479     unsigned char   luma_weight_l1_flag;
 480     /** \brief Same as the H.264 bitstream syntax element. */
 481     signed short    luma_weight_l1[32];
 482     /** \brief Same as the H.264 bitstream syntax element. */
 483     signed short    luma_offset_l1[32];
 484     /** \brief Same as the H.264 bitstream syntax element. */
 485     unsigned char   chroma_weight_l1_flag;
 486     /** \brief Same as the H.264 bitstream syntax element. */
 487     signed short    chroma_weight_l1[32][2];
 488     /** \brief Same as the H.264 bitstream syntax element. */
 489     signed short    chroma_offset_l1[32][2];
 490     /**@}*/
 491
 492     /** \brief Range: 0 to 2, inclusive. */
 493     unsigned char   cabac_init_idc;
 494     /** \brief Same as the H.264 bitstream syntax element. */
 495     signed char     slice_qp_delta;
 496     /** @name If deblocking_filter_control_present_flag */
 497     /**@{*/
 498     /** \brief Range: 0 to 2, inclusive. */
 499     unsigned char   disable_deblocking_filter_idc;
 500     /** \brief Same as the H.264 bitstream syntax element. */
 501     signed char     slice_alpha_c0_offset_div2;
 502     /** \brief Same as the H.264 bitstream syntax element. */
 503     signed char     slice_beta_offset_div2;
 504     /**@}*/
 505 } VAEncSliceParameterBufferH264;
 506
 507 /**
 508  * @name Macroblock neighbour availability bits
 509  *
 510  * \anchor api_enc_h264_mb_pred_avail_bits
 511  * Definitions for macroblock neighbour availability bits used in
 512  * intra prediction mode (non MBAFF only).
 513  *
 514  * @{
 515  */
 516 /** \brief References macroblock in the top-left corner. */
 517 #define VA_MB_PRED_AVAIL_TOP_LEFT         (1 << 2)
 518 /** \brief References macroblock above the current macroblock. */
 519 #define VA_MB_PRED_AVAIL_TOP              (1 << 4)
 520 /** \brief References macroblock in the top-right corner. */
 521 #define VA_MB_PRED_AVAIL_TOP_RIGHT        (1 << 3)
 522 /** \brief References macroblock on the left of the current macroblock. */
 523 #define VA_MB_PRED_AVAIL_LEFT             (1 << 6)
 524 /**@}*/
 525
 526 /**
 527  * \brief Macroblock parameter for H.264 encoding in baseline, main & high
 528  * profiles.
 529  *
 530  * This structure holds per-macroblock information. The buffer must be
 531  * allocated with as many elements (macroblocks) as necessary to fit
 532  * the slice to be encoded. Besides, the per-macroblock records must
 533  * be written in a strict raster order and with no gap. i.e. every
 534  * macroblock, regardless of its type, shall have an entry.
 535  */
 536 typedef struct _VAEncMacroblockParameterBufferH264 {
 537     /**
 538      * \brief Quantization parameter.
 539      *
 540      * Requested quantization parameter. Range: 0 to 51, inclusive.
 541      * If \ref qp is set to 0xff, then the actual value is derived
 542      * from the slice-level value: \c pic_init_qp + \c slice_qp_delta.
 543      */
 544     unsigned char   qp;
 545
 546     union {
 547         /** @name Data for intra macroblock */
 548         /**@{*/
 549         struct {
 550             union {
 551                 /**
 552                  * \brief Flag specified to override MB neighbour
 553                  * availability bits from VME stage.
 554                  *
 555                  * This flag specifies that macroblock neighbour
 556                  * availability bits from the VME stage are overriden
 557                  * by the \ref pred_avail_flags hereunder.
 558                  */
 559                 unsigned int    pred_avail_override_flag        : 1;
 560                 /**
 561                  * \brief Bitwise representation of which macroblocks
 562                  * are available for intra prediction.
 563                  *
 564                  * If the slice is intra-coded, this field represents
 565                  * the macroblocks available for intra prediction.
 566                  * See \ref api_enc_h264_mb_pred_avail_bits
 567                  * "macroblock neighbour availability" bit definitions.
 568                  */
 569                 unsigned int    pred_avail_flags                : 8;
 570             } bits;
 571             unsigned int value;
 572         } intra_fields;
 573         /**@}*/
 574
 575         /** @name Data for inter macroblock */
 576         /**@{*/
 577         struct {
 578             union {
 579             } bits;
 580             unsigned int value;
 581         } inter_fields;
 582         /**@}*/
 583     } info;
 584 } VAEncMacroblockParameterBufferH264;
 585
 586 /**@}*/
 587
 588 #ifdef __cplusplus
 589 }
 590 #endif
 591
 592 #endif /* VA_ENC_H264_H */