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   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <va/va.h>
  20 #include <va/va_enc_h264.h>
  21
  22 #include "libavutil/avassert.h"
  23 #include "libavutil/internal.h"
  24 #include "libavutil/opt.h"
  25 #include "libavutil/pixfmt.h"
  26
  27 #include "avcodec.h"
  28 #include "h264.h"
  29 #include "h264_sei.h"
  30 #include "internal.h"
  31 #include "vaapi_encode.h"
  32 #include "vaapi_encode_h26x.h"
  33
  34 enum {
  35     SLICE_TYPE_P  = 0,
  36     SLICE_TYPE_B  = 1,
  37     SLICE_TYPE_I  = 2,
  38     SLICE_TYPE_SP = 3,
  39     SLICE_TYPE_SI = 4,
  40 };
  41
  42 // This structure contains all possibly-useful per-sequence syntax elements
  43 // which are not already contained in the various VAAPI structures.
  44 typedef struct VAAPIEncodeH264MiscSequenceParams {
  45     unsigned int profile_idc;
  46     char constraint_set0_flag;
  47     char constraint_set1_flag;
  48     char constraint_set2_flag;
  49     char constraint_set3_flag;
  50     char constraint_set4_flag;
  51     char constraint_set5_flag;
  52
  53     char separate_colour_plane_flag;
  54     char qpprime_y_zero_transform_bypass_flag;
  55
  56     char gaps_in_frame_num_allowed_flag;
  57     char delta_pic_order_always_zero_flag;
  58     char bottom_field_pic_order_in_frame_present_flag;
  59
  60     unsigned int num_slice_groups_minus1;
  61     unsigned int slice_group_map_type;
  62
  63     int pic_init_qs_minus26;
  64
  65     char overscan_info_present_flag;
  66     char overscan_appropriate_flag;
  67
  68     char video_signal_type_present_flag;
  69     unsigned int video_format;
  70     char video_full_range_flag;
  71     char colour_description_present_flag;
  72     unsigned int colour_primaries;
  73     unsigned int transfer_characteristics;
  74     unsigned int matrix_coefficients;
  75
  76     char chroma_loc_info_present_flag;
  77     unsigned int chroma_sample_loc_type_top_field;
  78     unsigned int chroma_sample_loc_type_bottom_field;
  79
  80     // Some timing elements are in VAEncSequenceParameterBufferH264.
  81     char fixed_frame_rate_flag;
  82
  83     char nal_hrd_parameters_present_flag;
  84     char vcl_hrd_parameters_present_flag;
  85     char low_delay_hrd_flag;
  86     char pic_struct_present_flag;
  87
  88     char motion_vectors_over_pic_boundaries_flag;
  89     unsigned int max_bytes_per_pic_denom;
  90     unsigned int max_bits_per_mb_denom;
  91     unsigned int max_num_reorder_frames;
  92     unsigned int max_dec_pic_buffering;
  93
  94     unsigned int cpb_cnt_minus1;
  95     unsigned int bit_rate_scale;
  96     unsigned int cpb_size_scale;
  97     unsigned int bit_rate_value_minus1[32];
  98     unsigned int cpb_size_value_minus1[32];
  99     char cbr_flag[32];
 100     unsigned int initial_cpb_removal_delay_length_minus1;
 101     unsigned int cpb_removal_delay_length_minus1;
 102     unsigned int dpb_output_delay_length_minus1;
 103     unsigned int time_offset_length;
 104
 105     unsigned int initial_cpb_removal_delay;
 106     unsigned int initial_cpb_removal_delay_offset;
 107
 108     unsigned int pic_struct;
 109 } VAAPIEncodeH264MiscSequenceParams;
 110
 111 // This structure contains all possibly-useful per-slice syntax elements
 112 // which are not already contained in the various VAAPI structures.
 113 typedef struct VAAPIEncodeH264MiscSliceParams {
 114     unsigned int nal_unit_type;
 115     unsigned int nal_ref_idc;
 116
 117     unsigned int colour_plane_id;
 118     char field_pic_flag;
 119     char bottom_field_flag;
 120
 121     unsigned int redundant_pic_cnt;
 122
 123     char sp_for_switch_flag;
 124     int slice_qs_delta;
 125
 126     char ref_pic_list_modification_flag_l0;
 127     char ref_pic_list_modification_flag_l1;
 128
 129     char no_output_of_prior_pics_flag;
 130     char long_term_reference_flag;
 131     char adaptive_ref_pic_marking_mode_flag;
 132 } VAAPIEncodeH264MiscSliceParams;
 133
 134 typedef struct VAAPIEncodeH264Slice {
 135     VAAPIEncodeH264MiscSliceParams misc_slice_params;
 136 } VAAPIEncodeH264Slice;
 137
 138 typedef struct VAAPIEncodeH264Context {
 139     VAAPIEncodeH264MiscSequenceParams misc_sequence_params;
 140
 141     int mb_width;
 142     int mb_height;
 143
 144     int fixed_qp_idr;
 145     int fixed_qp_p;
 146     int fixed_qp_b;
 147
 148     int next_frame_num;
 149     int64_t idr_pic_count;
 150
 151     int cpb_delay;
 152     int dpb_delay;
 153
 154     // Rate control configuration.
 155     int send_timing_sei;
 156
 157 #if VA_CHECK_VERSION(0, 36, 0)
 158     // Speed-quality tradeoff setting.
 159     struct {
 160         VAEncMiscParameterBuffer misc;
 161         VAEncMiscParameterBufferQualityLevel quality;
 162     } quality_params;
 163 #endif
 164 } VAAPIEncodeH264Context;
 165
 166 typedef struct VAAPIEncodeH264Options {
 167     int qp;
 168     int quality;
 169     int low_power;
 170 } VAAPIEncodeH264Options;
 171
 172
 173 #define vseq_var(name)     vseq->name, name
 174 #define vseq_field(name)   vseq->seq_fields.bits.name, name
 175 #define vvui_field(name)   vseq->vui_fields.bits.name, name
 176 #define vpic_var(name)     vpic->name, name
 177 #define vpic_field(name)   vpic->pic_fields.bits.name, name
 178 #define vslice_var(name)   vslice->name, name
 179 #define vslice_field(name) vslice->slice_fields.bits.name, name
 180 #define mseq_var(name)     mseq->name, name
 181 #define mslice_var(name)   mslice->name, name
 182
 183 static void vaapi_encode_h264_write_nal_header(PutBitContext *pbc,
 184                                                int nal_unit_type, int nal_ref_idc)
 185 {
 186     u(1, 0, forbidden_zero_bit);
 187     u(2, nal_ref_idc, nal_ref_idc);
 188     u(5, nal_unit_type, nal_unit_type);
 189 }
 190
 191 static void vaapi_encode_h264_write_trailing_rbsp(PutBitContext *pbc)
 192 {
 193     u(1, 1, rbsp_stop_one_bit);
 194     while (put_bits_count(pbc) & 7)
 195         u(1, 0, rbsp_alignment_zero_bit);
 196 }
 197
 198 static void vaapi_encode_h264_write_vui(PutBitContext *pbc,
 199                                         VAAPIEncodeContext *ctx)
 200 {
 201     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
 202     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 203     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 204     int i;
 205
 206     u(1, vvui_field(aspect_ratio_info_present_flag));
 207     if (vseq->vui_fields.bits.aspect_ratio_info_present_flag) {
 208         u(8, vseq_var(aspect_ratio_idc));
 209         if (vseq->aspect_ratio_idc == 255) {
 210             u(16, vseq_var(sar_width));
 211             u(16, vseq_var(sar_height));
 212         }
 213     }
 214
 215     u(1, mseq_var(overscan_info_present_flag));
 216     if (mseq->overscan_info_present_flag)
 217         u(1, mseq_var(overscan_appropriate_flag));
 218
 219     u(1, mseq_var(video_signal_type_present_flag));
 220     if (mseq->video_signal_type_present_flag) {
 221         u(3, mseq_var(video_format));
 222         u(1, mseq_var(video_full_range_flag));
 223         u(1, mseq_var(colour_description_present_flag));
 224         if (mseq->colour_description_present_flag) {
 225             u(8, mseq_var(colour_primaries));
 226             u(8, mseq_var(transfer_characteristics));
 227             u(8, mseq_var(matrix_coefficients));
 228         }
 229     }
 230
 231     u(1, mseq_var(chroma_loc_info_present_flag));
 232     if (mseq->chroma_loc_info_present_flag) {
 233         ue(mseq_var(chroma_sample_loc_type_top_field));
 234         ue(mseq_var(chroma_sample_loc_type_bottom_field));
 235     }
 236
 237     u(1, vvui_field(timing_info_present_flag));
 238     if (vseq->vui_fields.bits.timing_info_present_flag) {
 239         u(32, vseq_var(num_units_in_tick));
 240         u(32, vseq_var(time_scale));
 241         u(1, mseq_var(fixed_frame_rate_flag));
 242     }
 243
 244     u(1, mseq_var(nal_hrd_parameters_present_flag));
 245     if (mseq->nal_hrd_parameters_present_flag) {
 246         ue(mseq_var(cpb_cnt_minus1));
 247         u(4, mseq_var(bit_rate_scale));
 248         u(4, mseq_var(cpb_size_scale));
 249         for (i = 0; i <= mseq->cpb_cnt_minus1; i++) {
 250             ue(mseq_var(bit_rate_value_minus1[i]));
 251             ue(mseq_var(cpb_size_value_minus1[i]));
 252             u(1, mseq_var(cbr_flag[i]));
 253         }
 254         u(5, mseq_var(initial_cpb_removal_delay_length_minus1));
 255         u(5, mseq_var(cpb_removal_delay_length_minus1));
 256         u(5, mseq_var(dpb_output_delay_length_minus1));
 257         u(5, mseq_var(time_offset_length));
 258     }
 259     u(1, mseq_var(vcl_hrd_parameters_present_flag));
 260     if (mseq->vcl_hrd_parameters_present_flag) {
 261         av_assert0(0 && "vcl hrd parameters not supported");
 262     }
 263
 264     if (mseq->nal_hrd_parameters_present_flag ||
 265         mseq->vcl_hrd_parameters_present_flag)
 266         u(1, mseq_var(low_delay_hrd_flag));
 267     u(1, mseq_var(pic_struct_present_flag));
 268
 269     u(1, vvui_field(bitstream_restriction_flag));
 270     if (vseq->vui_fields.bits.bitstream_restriction_flag) {
 271         u(1, mseq_var(motion_vectors_over_pic_boundaries_flag));
 272         ue(mseq_var(max_bytes_per_pic_denom));
 273         ue(mseq_var(max_bits_per_mb_denom));
 274         ue(vvui_field(log2_max_mv_length_horizontal));
 275         ue(vvui_field(log2_max_mv_length_vertical));
 276         ue(mseq_var(max_num_reorder_frames));
 277         ue(mseq_var(max_dec_pic_buffering));
 278     }
 279 }
 280
 281 static void vaapi_encode_h264_write_sps(PutBitContext *pbc,
 282                                         VAAPIEncodeContext *ctx)
 283 {
 284     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
 285     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 286     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 287     int i;
 288
 289     vaapi_encode_h264_write_nal_header(pbc, H264_NAL_SPS, 3);
 290
 291     u(8, mseq_var(profile_idc));
 292     u(1, mseq_var(constraint_set0_flag));
 293     u(1, mseq_var(constraint_set1_flag));
 294     u(1, mseq_var(constraint_set2_flag));
 295     u(1, mseq_var(constraint_set3_flag));
 296     u(1, mseq_var(constraint_set4_flag));
 297     u(1, mseq_var(constraint_set5_flag));
 298     u(2, 0, reserved_zero_2bits);
 299
 300     u(8, vseq_var(level_idc));
 301
 302     ue(vseq_var(seq_parameter_set_id));
 303
 304     if (mseq->profile_idc == 100 || mseq->profile_idc == 110 ||
 305         mseq->profile_idc == 122 || mseq->profile_idc == 244 ||
 306         mseq->profile_idc ==  44 || mseq->profile_idc ==  83 ||
 307         mseq->profile_idc ==  86 || mseq->profile_idc == 118 ||
 308         mseq->profile_idc == 128 || mseq->profile_idc == 138) {
 309         ue(vseq_field(chroma_format_idc));
 310
 311         if (vseq->seq_fields.bits.chroma_format_idc == 3)
 312             u(1, mseq_var(separate_colour_plane_flag));
 313
 314         ue(vseq_var(bit_depth_luma_minus8));
 315         ue(vseq_var(bit_depth_chroma_minus8));
 316
 317         u(1, mseq_var(qpprime_y_zero_transform_bypass_flag));
 318
 319         u(1, vseq_field(seq_scaling_matrix_present_flag));
 320         if (vseq->seq_fields.bits.seq_scaling_matrix_present_flag) {
 321             av_assert0(0 && "scaling matrices not supported");
 322         }
 323     }
 324
 325     ue(vseq_field(log2_max_frame_num_minus4));
 326     ue(vseq_field(pic_order_cnt_type));
 327
 328     if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
 329         ue(vseq_field(log2_max_pic_order_cnt_lsb_minus4));
 330     } else if (vseq->seq_fields.bits.pic_order_cnt_type == 1) {
 331         u(1, mseq_var(delta_pic_order_always_zero_flag));
 332         se(vseq_var(offset_for_non_ref_pic));
 333         se(vseq_var(offset_for_top_to_bottom_field));
 334         ue(vseq_var(num_ref_frames_in_pic_order_cnt_cycle));
 335
 336         for (i = 0; i < vseq->num_ref_frames_in_pic_order_cnt_cycle; i++)
 337             se(vseq_var(offset_for_ref_frame[i]));
 338     }
 339
 340     ue(vseq_var(max_num_ref_frames));
 341     u(1, mseq_var(gaps_in_frame_num_allowed_flag));
 342
 343     ue(vseq->picture_width_in_mbs  - 1, pic_width_in_mbs_minus1);
 344     ue(vseq->picture_height_in_mbs - 1, pic_height_in_mbs_minus1);
 345
 346     u(1, vseq_field(frame_mbs_only_flag));
 347     if (!vseq->seq_fields.bits.frame_mbs_only_flag)
 348         u(1, vseq_field(mb_adaptive_frame_field_flag));
 349
 350     u(1, vseq_field(direct_8x8_inference_flag));
 351
 352     u(1, vseq_var(frame_cropping_flag));
 353     if (vseq->frame_cropping_flag) {
 354         ue(vseq_var(frame_crop_left_offset));
 355         ue(vseq_var(frame_crop_right_offset));
 356         ue(vseq_var(frame_crop_top_offset));
 357         ue(vseq_var(frame_crop_bottom_offset));
 358     }
 359
 360     u(1, vseq_var(vui_parameters_present_flag));
 361     if (vseq->vui_parameters_present_flag)
 362         vaapi_encode_h264_write_vui(pbc, ctx);
 363
 364     vaapi_encode_h264_write_trailing_rbsp(pbc);
 365 }
 366
 367 static void vaapi_encode_h264_write_pps(PutBitContext *pbc,
 368                                         VAAPIEncodeContext *ctx)
 369 {
 370     VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
 371     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 372     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 373
 374     vaapi_encode_h264_write_nal_header(pbc, H264_NAL_PPS, 3);
 375
 376     ue(vpic_var(pic_parameter_set_id));
 377     ue(vpic_var(seq_parameter_set_id));
 378
 379     u(1, vpic_field(entropy_coding_mode_flag));
 380     u(1, mseq_var(bottom_field_pic_order_in_frame_present_flag));
 381
 382     ue(mseq_var(num_slice_groups_minus1));
 383     if (mseq->num_slice_groups_minus1 > 0) {
 384         ue(mseq_var(slice_group_map_type));
 385         av_assert0(0 && "slice groups not supported");
 386     }
 387
 388     ue(vpic_var(num_ref_idx_l0_active_minus1));
 389     ue(vpic_var(num_ref_idx_l1_active_minus1));
 390
 391     u(1, vpic_field(weighted_pred_flag));
 392     u(2, vpic_field(weighted_bipred_idc));
 393
 394     se(vpic->pic_init_qp - 26, pic_init_qp_minus26);
 395     se(mseq_var(pic_init_qs_minus26));
 396     se(vpic_var(chroma_qp_index_offset));
 397
 398     u(1, vpic_field(deblocking_filter_control_present_flag));
 399     u(1, vpic_field(constrained_intra_pred_flag));
 400     u(1, vpic_field(redundant_pic_cnt_present_flag));
 401     u(1, vpic_field(transform_8x8_mode_flag));
 402
 403     u(1, vpic_field(pic_scaling_matrix_present_flag));
 404     if (vpic->pic_fields.bits.pic_scaling_matrix_present_flag) {
 405         av_assert0(0 && "scaling matrices not supported");
 406     }
 407
 408     se(vpic_var(second_chroma_qp_index_offset));
 409
 410     vaapi_encode_h264_write_trailing_rbsp(pbc);
 411 }
 412
 413 static void vaapi_encode_h264_write_slice_header2(PutBitContext *pbc,
 414                                                   VAAPIEncodeContext *ctx,
 415                                                   VAAPIEncodePicture *pic,
 416                                                   VAAPIEncodeSlice *slice)
 417 {
 418     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
 419     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
 420     VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
 421     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 422     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 423     VAAPIEncodeH264Slice            *pslice = slice->priv_data;
 424     VAAPIEncodeH264MiscSliceParams  *mslice = &pslice->misc_slice_params;
 425
 426     vaapi_encode_h264_write_nal_header(pbc, mslice->nal_unit_type,
 427                                        mslice->nal_ref_idc);
 428
 429     ue(vslice->macroblock_address, first_mb_in_slice);
 430     ue(vslice_var(slice_type));
 431     ue(vpic_var(pic_parameter_set_id));
 432
 433     if (mseq->separate_colour_plane_flag) {
 434         u(2, mslice_var(colour_plane_id));
 435     }
 436
 437     u(4 + vseq->seq_fields.bits.log2_max_frame_num_minus4,
 438       (vpic->frame_num &
 439        ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1)),
 440       frame_num);
 441
 442     if (!vseq->seq_fields.bits.frame_mbs_only_flag) {
 443         u(1, mslice_var(field_pic_flag));
 444         if (mslice->field_pic_flag)
 445             u(1, mslice_var(bottom_field_flag));
 446     }
 447
 448     if (vpic->pic_fields.bits.idr_pic_flag) {
 449         ue(vslice_var(idr_pic_id));
 450     }
 451
 452     if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
 453         u(4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4,
 454           vslice_var(pic_order_cnt_lsb));
 455         if (mseq->bottom_field_pic_order_in_frame_present_flag &&
 456             !mslice->field_pic_flag) {
 457             se(vslice_var(delta_pic_order_cnt_bottom));
 458         }
 459     }
 460
 461     if (vseq->seq_fields.bits.pic_order_cnt_type == 1 &&
 462         !vseq->seq_fields.bits.delta_pic_order_always_zero_flag) {
 463         se(vslice_var(delta_pic_order_cnt[0]));
 464         if (mseq->bottom_field_pic_order_in_frame_present_flag &&
 465             !mslice->field_pic_flag) {
 466             se(vslice_var(delta_pic_order_cnt[1]));
 467         }
 468     }
 469
 470     if (vpic->pic_fields.bits.redundant_pic_cnt_present_flag) {
 471         ue(mslice_var(redundant_pic_cnt));
 472     }
 473
 474     if (vslice->slice_type == SLICE_TYPE_B) {
 475         u(1, vslice_var(direct_spatial_mv_pred_flag));
 476     }
 477
 478     if (vslice->slice_type == SLICE_TYPE_P ||
 479         vslice->slice_type == SLICE_TYPE_SP ||
 480         vslice->slice_type == SLICE_TYPE_B) {
 481         u(1, vslice_var(num_ref_idx_active_override_flag));
 482         if (vslice->num_ref_idx_active_override_flag) {
 483             ue(vslice_var(num_ref_idx_l0_active_minus1));
 484             if (vslice->slice_type == SLICE_TYPE_B)
 485                 ue(vslice_var(num_ref_idx_l1_active_minus1));
 486         }
 487     }
 488
 489     if (mslice->nal_unit_type == 20 || mslice->nal_unit_type == 21) {
 490         av_assert0(0 && "no MVC support");
 491     } else {
 492         if (vslice->slice_type % 5 != 2 && vslice->slice_type % 5 != 4) {
 493             u(1, mslice_var(ref_pic_list_modification_flag_l0));
 494             if (mslice->ref_pic_list_modification_flag_l0) {
 495                 av_assert0(0 && "ref pic list modification");
 496             }
 497         }
 498         if (vslice->slice_type % 5 == 1) {
 499             u(1, mslice_var(ref_pic_list_modification_flag_l1));
 500             if (mslice->ref_pic_list_modification_flag_l1) {
 501                 av_assert0(0 && "ref pic list modification");
 502             }
 503         }
 504     }
 505
 506     if ((vpic->pic_fields.bits.weighted_pred_flag &&
 507          (vslice->slice_type == SLICE_TYPE_P ||
 508           vslice->slice_type == SLICE_TYPE_SP)) ||
 509         (vpic->pic_fields.bits.weighted_bipred_idc == 1 &&
 510          vslice->slice_type == SLICE_TYPE_B)) {
 511         av_assert0(0 && "prediction weights not supported");
 512     }
 513
 514     av_assert0(mslice->nal_ref_idc > 0 ==
 515                vpic->pic_fields.bits.reference_pic_flag);
 516     if (mslice->nal_ref_idc != 0) {
 517         if (vpic->pic_fields.bits.idr_pic_flag) {
 518             u(1, mslice_var(no_output_of_prior_pics_flag));
 519             u(1, mslice_var(long_term_reference_flag));
 520         } else {
 521             u(1, mslice_var(adaptive_ref_pic_marking_mode_flag));
 522             if (mslice->adaptive_ref_pic_marking_mode_flag) {
 523                 av_assert0(0 && "MMCOs not supported");
 524             }
 525         }
 526     }
 527
 528     if (vpic->pic_fields.bits.entropy_coding_mode_flag &&
 529         vslice->slice_type != SLICE_TYPE_I &&
 530         vslice->slice_type != SLICE_TYPE_SI) {
 531         ue(vslice_var(cabac_init_idc));
 532     }
 533
 534     se(vslice_var(slice_qp_delta));
 535     if (vslice->slice_type == SLICE_TYPE_SP ||
 536         vslice->slice_type == SLICE_TYPE_SI) {
 537         if (vslice->slice_type == SLICE_TYPE_SP)
 538             u(1, mslice_var(sp_for_switch_flag));
 539         se(mslice_var(slice_qs_delta));
 540     }
 541
 542     if (vpic->pic_fields.bits.deblocking_filter_control_present_flag) {
 543         ue(vslice_var(disable_deblocking_filter_idc));
 544         if (vslice->disable_deblocking_filter_idc != 1) {
 545             se(vslice_var(slice_alpha_c0_offset_div2));
 546             se(vslice_var(slice_beta_offset_div2));
 547         }
 548     }
 549
 550     if (mseq->num_slice_groups_minus1 > 0 &&
 551         mseq->slice_group_map_type >= 3 && mseq->slice_group_map_type <= 5) {
 552         av_assert0(0 && "slice groups not supported");
 553     }
 554
 555     // No alignment - this need not be a byte boundary.
 556 }
 557
 558 static void vaapi_encode_h264_write_buffering_period(PutBitContext *pbc,
 559                                                      VAAPIEncodeContext *ctx,
 560                                                      VAAPIEncodePicture *pic)
 561 {
 562     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 563     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 564     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
 565     int i;
 566
 567     ue(vpic_var(seq_parameter_set_id));
 568
 569     if (mseq->nal_hrd_parameters_present_flag) {
 570         for (i = 0; i <= mseq->cpb_cnt_minus1; i++) {
 571             u(mseq->initial_cpb_removal_delay_length_minus1 + 1,
 572               mseq_var(initial_cpb_removal_delay));
 573             u(mseq->initial_cpb_removal_delay_length_minus1 + 1,
 574               mseq_var(initial_cpb_removal_delay_offset));
 575         }
 576     }
 577     if (mseq->vcl_hrd_parameters_present_flag) {
 578         av_assert0(0 && "vcl hrd parameters not supported");
 579     }
 580 }
 581
 582 static void vaapi_encode_h264_write_pic_timing(PutBitContext *pbc,
 583                                                VAAPIEncodeContext *ctx,
 584                                                VAAPIEncodePicture *pic)
 585 {
 586     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
 587     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 588     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 589     int i, num_clock_ts;
 590
 591     if (mseq->nal_hrd_parameters_present_flag ||
 592         mseq->vcl_hrd_parameters_present_flag) {
 593         u(mseq->cpb_removal_delay_length_minus1 + 1,
 594           2 * vseq->num_units_in_tick * priv->cpb_delay,
 595           cpb_removal_delay);
 596         u(mseq->dpb_output_delay_length_minus1 + 1,
 597           2 * vseq->num_units_in_tick * priv->dpb_delay,
 598           dpb_output_delay);
 599     }
 600     if (mseq->pic_struct_present_flag) {
 601         u(4, mseq_var(pic_struct));
 602         num_clock_ts = (mseq->pic_struct <= 2 ? 1 :
 603                         mseq->pic_struct <= 4 ? 2 :
 604                         mseq->pic_struct <= 8 ? 3 : 0);
 605         for (i = 0; i < num_clock_ts; i++) {
 606             u(1, 0, clock_timestamp_flag[i]);
 607             // No full timestamp information.
 608         }
 609     }
 610 }
 611
 612 static void vaapi_encode_h264_write_identifier(PutBitContext *pbc,
 613                                                VAAPIEncodeContext *ctx,
 614                                                VAAPIEncodePicture *pic)
 615 {
 616     const char *lavc   = LIBAVCODEC_IDENT;
 617     const char *vaapi  = VA_VERSION_S;
 618     const char *driver = vaQueryVendorString(ctx->hwctx->display);
 619     char tmp[256];
 620     int i;
 621
 622     // Random (version 4) ISO 11578 UUID.
 623     uint8_t uuid[16] = {
 624         0x59, 0x94, 0x8b, 0x28, 0x11, 0xec, 0x45, 0xaf,
 625         0x96, 0x75, 0x19, 0xd4, 0x1f, 0xea, 0xa9, 0x4d,
 626     };
 627
 628     for (i = 0; i < 16; i++)
 629         u(8, uuid[i], uuid_iso_iec_11578);
 630
 631     snprintf(tmp, sizeof(tmp), "%s / VAAPI %s / %s", lavc, vaapi, driver);
 632     for (i = 0; i < sizeof(tmp) && tmp[i]; i++)
 633         u(8, tmp[i], user_data_payload_byte);
 634 }
 635
 636 static void vaapi_encode_h264_write_sei(PutBitContext *pbc,
 637                                         VAAPIEncodeContext *ctx,
 638                                         VAAPIEncodePicture *pic)
 639 {
 640     VAAPIEncodeH264Context *priv = ctx->priv_data;
 641     PutBitContext payload_bits;
 642     char payload[256];
 643     int payload_type, payload_size, i;
 644     void (*write_payload)(PutBitContext *pbc,
 645                           VAAPIEncodeContext *ctx,
 646                           VAAPIEncodePicture *pic) = NULL;
 647
 648     vaapi_encode_h264_write_nal_header(pbc, H264_NAL_SEI, 0);
 649
 650     for (payload_type = 0; payload_type < 64; payload_type++) {
 651         switch (payload_type) {
 652         case SEI_TYPE_BUFFERING_PERIOD:
 653             if (!priv->send_timing_sei ||
 654                 pic->type != PICTURE_TYPE_IDR)
 655                 continue;
 656             write_payload = &vaapi_encode_h264_write_buffering_period;
 657             break;
 658         case SEI_TYPE_PIC_TIMING:
 659             if (!priv->send_timing_sei)
 660                 continue;
 661             write_payload = &vaapi_encode_h264_write_pic_timing;
 662             break;
 663         case SEI_TYPE_USER_DATA_UNREGISTERED:
 664             if (pic->encode_order != 0)
 665                 continue;
 666             write_payload = &vaapi_encode_h264_write_identifier;
 667             break;
 668         default:
 669             continue;
 670         }
 671
 672         init_put_bits(&payload_bits, payload, sizeof(payload));
 673         write_payload(&payload_bits, ctx, pic);
 674         if (put_bits_count(&payload_bits) & 7) {
 675             write_u(&payload_bits, 1, 1, bit_equal_to_one);
 676             while (put_bits_count(&payload_bits) & 7)
 677                 write_u(&payload_bits, 1, 0, bit_equal_to_zero);
 678         }
 679         payload_size = put_bits_count(&payload_bits) / 8;
 680         flush_put_bits(&payload_bits);
 681
 682         u(8, payload_type, last_payload_type_byte);
 683         u(8, payload_size, last_payload_size_byte);
 684         for (i = 0; i < payload_size; i++)
 685             u(8, payload[i] & 0xff, sei_payload);
 686     }
 687
 688     vaapi_encode_h264_write_trailing_rbsp(pbc);
 689 }
 690
 691 static int vaapi_encode_h264_write_sequence_header(AVCodecContext *avctx,
 692                                                    char *data, size_t *data_len)
 693 {
 694     VAAPIEncodeContext *ctx = avctx->priv_data;
 695     PutBitContext pbc;
 696     char tmp[256];
 697     int err;
 698     size_t nal_len, bit_len, bit_pos, next_len;
 699
 700     bit_len = *data_len;
 701     bit_pos = 0;
 702
 703     init_put_bits(&pbc, tmp, sizeof(tmp));
 704     vaapi_encode_h264_write_sps(&pbc, ctx);
 705     nal_len = put_bits_count(&pbc);
 706     flush_put_bits(&pbc);
 707
 708     next_len = bit_len - bit_pos;
 709     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
 710                                                        &next_len,
 711                                                        tmp, nal_len);
 712     if (err < 0)
 713         return err;
 714     bit_pos += next_len;
 715
 716     init_put_bits(&pbc, tmp, sizeof(tmp));
 717     vaapi_encode_h264_write_pps(&pbc, ctx);
 718     nal_len = put_bits_count(&pbc);
 719     flush_put_bits(&pbc);
 720
 721     next_len = bit_len - bit_pos;
 722     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
 723                                                        &next_len,
 724                                                        tmp, nal_len);
 725     if (err < 0)
 726         return err;
 727     bit_pos += next_len;
 728
 729     *data_len = bit_pos;
 730     return 0;
 731 }
 732
 733 static int vaapi_encode_h264_write_slice_header(AVCodecContext *avctx,
 734                                                 VAAPIEncodePicture *pic,
 735                                                 VAAPIEncodeSlice *slice,
 736                                                 char *data, size_t *data_len)
 737 {
 738     VAAPIEncodeContext *ctx = avctx->priv_data;
 739     PutBitContext pbc;
 740     char tmp[256];
 741     size_t header_len;
 742
 743     init_put_bits(&pbc, tmp, sizeof(tmp));
 744     vaapi_encode_h264_write_slice_header2(&pbc, ctx, pic, slice);
 745     header_len = put_bits_count(&pbc);
 746     flush_put_bits(&pbc);
 747
 748     return ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data, data_len,
 749                                                         tmp, header_len);
 750 }
 751
 752 static int vaapi_encode_h264_write_extra_header(AVCodecContext *avctx,
 753                                                 VAAPIEncodePicture *pic,
 754                                                 int index, int *type,
 755                                                 char *data, size_t *data_len)
 756 {
 757     VAAPIEncodeContext *ctx = avctx->priv_data;
 758     PutBitContext pbc;
 759     char tmp[256];
 760     size_t header_len;
 761
 762     if (index == 0 && ctx->va_rc_mode == VA_RC_CBR) {
 763         *type = VAEncPackedHeaderH264_SEI;
 764
 765         init_put_bits(&pbc, tmp, sizeof(tmp));
 766         vaapi_encode_h264_write_sei(&pbc, ctx, pic);
 767         header_len = put_bits_count(&pbc);
 768         flush_put_bits(&pbc);
 769
 770         return ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data, data_len,
 771                                                             tmp, header_len);
 772
 773     } else {
 774         return AVERROR_EOF;
 775     }
 776 }
 777
 778 static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
 779 {
 780     VAAPIEncodeContext                 *ctx = avctx->priv_data;
 781     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
 782     VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
 783     VAAPIEncodeH264Context            *priv = ctx->priv_data;
 784     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
 785     int i;
 786
 787     {
 788         vseq->seq_parameter_set_id = 0;
 789
 790         vseq->level_idc = avctx->level;
 791
 792         vseq->max_num_ref_frames = 1 + (avctx->max_b_frames > 0);
 793
 794         vseq->picture_width_in_mbs  = priv->mb_width;
 795         vseq->picture_height_in_mbs = priv->mb_height;
 796
 797         vseq->seq_fields.bits.chroma_format_idc = 1;
 798         vseq->seq_fields.bits.frame_mbs_only_flag = 1;
 799         vseq->seq_fields.bits.direct_8x8_inference_flag = 1;
 800         vseq->seq_fields.bits.log2_max_frame_num_minus4 = 4;
 801         vseq->seq_fields.bits.pic_order_cnt_type = 0;
 802
 803         if (avctx->width  != ctx->surface_width ||
 804             avctx->height != ctx->surface_height) {
 805             vseq->frame_cropping_flag = 1;
 806
 807             vseq->frame_crop_left_offset   = 0;
 808             vseq->frame_crop_right_offset  =
 809                 (ctx->surface_width - avctx->width) / 2;
 810             vseq->frame_crop_top_offset    = 0;
 811             vseq->frame_crop_bottom_offset =
 812                 (ctx->surface_height - avctx->height) / 2;
 813         } else {
 814             vseq->frame_cropping_flag = 0;
 815         }
 816
 817         vseq->vui_parameters_present_flag = 1;
 818         if (avctx->sample_aspect_ratio.num != 0) {
 819             vseq->vui_fields.bits.aspect_ratio_info_present_flag = 1;
 820             // There is a large enum of these which we could support
 821             // individually rather than using the generic X/Y form?
 822             if (avctx->sample_aspect_ratio.num ==
 823                 avctx->sample_aspect_ratio.den) {
 824                 vseq->aspect_ratio_idc = 1;
 825             } else {
 826                 vseq->aspect_ratio_idc = 255; // Extended SAR.
 827                 vseq->sar_width  = avctx->sample_aspect_ratio.num;
 828                 vseq->sar_height = avctx->sample_aspect_ratio.den;
 829             }
 830         }
 831         if (avctx->color_primaries != AVCOL_PRI_UNSPECIFIED ||
 832             avctx->color_trc       != AVCOL_TRC_UNSPECIFIED ||
 833             avctx->colorspace      != AVCOL_SPC_UNSPECIFIED) {
 834             mseq->video_signal_type_present_flag = 1;
 835             mseq->video_format             = 5; // Unspecified.
 836             mseq->video_full_range_flag    = 0;
 837             mseq->colour_description_present_flag = 1;
 838             // These enums are derived from the standard and hence
 839             // we can just use the values directly.
 840             mseq->colour_primaries         = avctx->color_primaries;
 841             mseq->transfer_characteristics = avctx->color_trc;
 842             mseq->matrix_coefficients      = avctx->colorspace;
 843         }
 844
 845         vseq->vui_fields.bits.bitstream_restriction_flag = 1;
 846         mseq->motion_vectors_over_pic_boundaries_flag = 1;
 847         mseq->max_bytes_per_pic_denom = 0;
 848         mseq->max_bits_per_mb_denom   = 0;
 849         vseq->vui_fields.bits.log2_max_mv_length_horizontal = 16;
 850         vseq->vui_fields.bits.log2_max_mv_length_vertical   = 16;
 851
 852         mseq->max_num_reorder_frames = (avctx->max_b_frames > 0);
 853         mseq->max_dec_pic_buffering  = vseq->max_num_ref_frames;
 854
 855         vseq->bits_per_second = avctx->bit_rate;
 856
 857         vseq->vui_fields.bits.timing_info_present_flag = 1;
 858         if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {
 859             vseq->num_units_in_tick = avctx->framerate.den;
 860             vseq->time_scale        = 2 * avctx->framerate.num;
 861             mseq->fixed_frame_rate_flag = 1;
 862         } else {
 863             vseq->num_units_in_tick = avctx->time_base.num;
 864             vseq->time_scale        = 2 * avctx->time_base.den;
 865             mseq->fixed_frame_rate_flag = 0;
 866         }
 867
 868         if (ctx->va_rc_mode == VA_RC_CBR) {
 869             priv->send_timing_sei = 1;
 870             mseq->nal_hrd_parameters_present_flag = 1;
 871
 872             mseq->cpb_cnt_minus1 = 0;
 873
 874             // Try to scale these to a sensible range so that the
 875             // golomb encode of the value is not overlong.
 876             mseq->bit_rate_scale =
 877                 av_clip_uintp2(av_log2(avctx->bit_rate) - 15 - 6, 4);
 878             mseq->bit_rate_value_minus1[0] =
 879                 (avctx->bit_rate >> mseq->bit_rate_scale + 6) - 1;
 880
 881             mseq->cpb_size_scale =
 882                 av_clip_uintp2(av_log2(ctx->hrd_params.hrd.buffer_size) - 15 - 4, 4);
 883             mseq->cpb_size_value_minus1[0] =
 884                 (ctx->hrd_params.hrd.buffer_size >> mseq->cpb_size_scale + 4) - 1;
 885
 886             // CBR mode isn't actually available here, despite naming.
 887             mseq->cbr_flag[0] = 0;
 888
 889             mseq->initial_cpb_removal_delay_length_minus1 = 23;
 890             mseq->cpb_removal_delay_length_minus1         = 23;
 891             mseq->dpb_output_delay_length_minus1          = 7;
 892             mseq->time_offset_length = 0;
 893
 894             // This calculation can easily overflow 32 bits.
 895             mseq->initial_cpb_removal_delay = 90000 *
 896                 (uint64_t)ctx->hrd_params.hrd.initial_buffer_fullness /
 897                 ctx->hrd_params.hrd.buffer_size;
 898
 899             mseq->initial_cpb_removal_delay_offset = 0;
 900         } else {
 901             priv->send_timing_sei = 0;
 902             mseq->nal_hrd_parameters_present_flag = 0;
 903         }
 904
 905         vseq->intra_period     = ctx->p_per_i * (ctx->b_per_p + 1);
 906         vseq->intra_idr_period = vseq->intra_period;
 907         vseq->ip_period        = ctx->b_per_p + 1;
 908     }
 909
 910     {
 911         vpic->CurrPic.picture_id = VA_INVALID_ID;
 912         vpic->CurrPic.flags      = VA_PICTURE_H264_INVALID;
 913
 914         for (i = 0; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
 915             vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
 916             vpic->ReferenceFrames[i].flags      = VA_PICTURE_H264_INVALID;
 917         }
 918
 919         vpic->coded_buf = VA_INVALID_ID;
 920
 921         vpic->pic_parameter_set_id = 0;
 922         vpic->seq_parameter_set_id = 0;
 923
 924         vpic->num_ref_idx_l0_active_minus1 = 0;
 925         vpic->num_ref_idx_l1_active_minus1 = 0;
 926
 927         vpic->pic_fields.bits.entropy_coding_mode_flag =
 928             ((avctx->profile & 0xff) != 66);
 929         vpic->pic_fields.bits.weighted_pred_flag = 0;
 930         vpic->pic_fields.bits.weighted_bipred_idc = 0;
 931         vpic->pic_fields.bits.transform_8x8_mode_flag =
 932             ((avctx->profile & 0xff) >= 100);
 933
 934         vpic->pic_init_qp = priv->fixed_qp_idr;
 935     }
 936
 937     {
 938         mseq->profile_idc = avctx->profile & 0xff;
 939
 940         if (avctx->profile & FF_PROFILE_H264_CONSTRAINED)
 941             mseq->constraint_set1_flag = 1;
 942         if (avctx->profile & FF_PROFILE_H264_INTRA)
 943             mseq->constraint_set3_flag = 1;
 944     }
 945
 946     return 0;
 947 }
 948
 949 static int vaapi_encode_h264_init_picture_params(AVCodecContext *avctx,
 950                                                  VAAPIEncodePicture *pic)
 951 {
 952     VAAPIEncodeContext                *ctx = avctx->priv_data;
 953     VAEncSequenceParameterBufferH264 *vseq = ctx->codec_sequence_params;
 954     VAEncPictureParameterBufferH264  *vpic = pic->codec_picture_params;
 955     VAAPIEncodeH264Context           *priv = ctx->priv_data;
 956     int i;
 957
 958     if (pic->type == PICTURE_TYPE_IDR) {
 959         av_assert0(pic->display_order == pic->encode_order);
 960         vpic->frame_num = 0;
 961         priv->next_frame_num = 1;
 962         priv->cpb_delay = 0;
 963     } else {
 964         vpic->frame_num = priv->next_frame_num;
 965         if (pic->type != PICTURE_TYPE_B) {
 966             // nal_ref_idc != 0
 967             ++priv->next_frame_num;
 968         }
 969         ++priv->cpb_delay;
 970     }
 971     priv->dpb_delay = pic->display_order - pic->encode_order + 1;
 972
 973     vpic->frame_num = vpic->frame_num &
 974         ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1);
 975
 976     vpic->CurrPic.picture_id          = pic->recon_surface;
 977     vpic->CurrPic.frame_idx           = vpic->frame_num;
 978     vpic->CurrPic.flags               = 0;
 979     vpic->CurrPic.TopFieldOrderCnt    = pic->display_order;
 980     vpic->CurrPic.BottomFieldOrderCnt = pic->display_order;
 981
 982     for (i = 0; i < pic->nb_refs; i++) {
 983         VAAPIEncodePicture *ref = pic->refs[i];
 984         av_assert0(ref && ref->encode_order < pic->encode_order);
 985         vpic->ReferenceFrames[i].picture_id = ref->recon_surface;
 986         vpic->ReferenceFrames[i].frame_idx  = ref->encode_order;
 987         vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_SHORT_TERM_REFERENCE;
 988         vpic->ReferenceFrames[i].TopFieldOrderCnt    = ref->display_order;
 989         vpic->ReferenceFrames[i].BottomFieldOrderCnt = ref->display_order;
 990     }
 991     for (; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
 992         vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
 993         vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_INVALID;
 994     }
 995
 996     vpic->coded_buf = pic->output_buffer;
 997
 998     vpic->pic_fields.bits.idr_pic_flag = (pic->type == PICTURE_TYPE_IDR);
 999     vpic->pic_fields.bits.reference_pic_flag = (pic->type != PICTURE_TYPE_B);
1000
1001     pic->nb_slices = 1;
1002
1003     return 0;
1004 }
1005
1006 static int vaapi_encode_h264_init_slice_params(AVCodecContext *avctx,
1007                                                VAAPIEncodePicture *pic,
1008                                                VAAPIEncodeSlice *slice)
1009 {
1010     VAAPIEncodeContext                 *ctx = avctx->priv_data;
1011     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
1012     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
1013     VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
1014     VAAPIEncodeH264Context            *priv = ctx->priv_data;
1015     VAAPIEncodeH264Slice            *pslice;
1016     VAAPIEncodeH264MiscSliceParams  *mslice;
1017     int i;
1018
1019     slice->priv_data = av_mallocz(sizeof(*pslice));
1020     if (!slice->priv_data)
1021         return AVERROR(ENOMEM);
1022     pslice = slice->priv_data;
1023     mslice = &pslice->misc_slice_params;
1024
1025     if (pic->type == PICTURE_TYPE_IDR)
1026         mslice->nal_unit_type = H264_NAL_IDR_SLICE;
1027     else
1028         mslice->nal_unit_type = H264_NAL_SLICE;
1029
1030     switch (pic->type) {
1031     case PICTURE_TYPE_IDR:
1032         vslice->slice_type  = SLICE_TYPE_I;
1033         mslice->nal_ref_idc = 3;
1034         break;
1035     case PICTURE_TYPE_I:
1036         vslice->slice_type  = SLICE_TYPE_I;
1037         mslice->nal_ref_idc = 2;
1038         break;
1039     case PICTURE_TYPE_P:
1040         vslice->slice_type  = SLICE_TYPE_P;
1041         mslice->nal_ref_idc = 1;
1042         break;
1043     case PICTURE_TYPE_B:
1044         vslice->slice_type  = SLICE_TYPE_B;
1045         mslice->nal_ref_idc = 0;
1046         break;
1047     default:
1048         av_assert0(0 && "invalid picture type");
1049     }
1050
1051     // Only one slice per frame.
1052     vslice->macroblock_address = 0;
1053     vslice->num_macroblocks = priv->mb_width * priv->mb_height;
1054
1055     vslice->macroblock_info = VA_INVALID_ID;
1056
1057     vslice->pic_parameter_set_id = vpic->pic_parameter_set_id;
1058     vslice->idr_pic_id = priv->idr_pic_count++;
1059
1060     vslice->pic_order_cnt_lsb = pic->display_order &
1061         ((1 << (4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4)) - 1);
1062
1063     for (i = 0; i < FF_ARRAY_ELEMS(vslice->RefPicList0); i++) {
1064         vslice->RefPicList0[i].picture_id = VA_INVALID_ID;
1065         vslice->RefPicList0[i].flags      = VA_PICTURE_H264_INVALID;
1066         vslice->RefPicList1[i].picture_id = VA_INVALID_ID;
1067         vslice->RefPicList1[i].flags      = VA_PICTURE_H264_INVALID;
1068     }
1069
1070     av_assert0(pic->nb_refs <= 2);
1071     if (pic->nb_refs >= 1) {
1072         // Backward reference for P- or B-frame.
1073         av_assert0(pic->type == PICTURE_TYPE_P ||
1074                    pic->type == PICTURE_TYPE_B);
1075
1076         vslice->num_ref_idx_l0_active_minus1 = 0;
1077         vslice->RefPicList0[0] = vpic->ReferenceFrames[0];
1078     }
1079     if (pic->nb_refs >= 2) {
1080         // Forward reference for B-frame.
1081         av_assert0(pic->type == PICTURE_TYPE_B);
1082
1083         vslice->num_ref_idx_l1_active_minus1 = 0;
1084         vslice->RefPicList1[0] = vpic->ReferenceFrames[1];
1085     }
1086
1087     if (pic->type == PICTURE_TYPE_B)
1088         vslice->slice_qp_delta = priv->fixed_qp_b - vpic->pic_init_qp;
1089     else if (pic->type == PICTURE_TYPE_P)
1090         vslice->slice_qp_delta = priv->fixed_qp_p - vpic->pic_init_qp;
1091     else
1092         vslice->slice_qp_delta = priv->fixed_qp_idr - vpic->pic_init_qp;
1093
1094     vslice->direct_spatial_mv_pred_flag = 1;
1095
1096     return 0;
1097 }
1098
1099 static av_cold int vaapi_encode_h264_configure(AVCodecContext *avctx)
1100 {
1101     VAAPIEncodeContext      *ctx = avctx->priv_data;
1102     VAAPIEncodeH264Context *priv = ctx->priv_data;
1103     VAAPIEncodeH264Options  *opt = ctx->codec_options;
1104
1105     priv->mb_width  = FFALIGN(avctx->width,  16) / 16;
1106     priv->mb_height = FFALIGN(avctx->height, 16) / 16;
1107
1108     if (ctx->va_rc_mode == VA_RC_CQP) {
1109         priv->fixed_qp_p = opt->qp;
1110         if (avctx->i_quant_factor > 0.0)
1111             priv->fixed_qp_idr = (int)((priv->fixed_qp_p * avctx->i_quant_factor +
1112                                         avctx->i_quant_offset) + 0.5);
1113         else
1114             priv->fixed_qp_idr = priv->fixed_qp_p;
1115         if (avctx->b_quant_factor > 0.0)
1116             priv->fixed_qp_b = (int)((priv->fixed_qp_p * avctx->b_quant_factor +
1117                                       avctx->b_quant_offset) + 0.5);
1118         else
1119             priv->fixed_qp_b = priv->fixed_qp_p;
1120
1121         av_log(avctx, AV_LOG_DEBUG, "Using fixed QP = "
1122                "%d / %d / %d for IDR- / P- / B-frames.\n",
1123                priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
1124
1125     } else if (ctx->va_rc_mode == VA_RC_CBR) {
1126         // These still need to be  set for pic_init_qp/slice_qp_delta.
1127         priv->fixed_qp_idr = 26;
1128         priv->fixed_qp_p   = 26;
1129         priv->fixed_qp_b   = 26;
1130
1131         av_log(avctx, AV_LOG_DEBUG, "Using constant-bitrate = %d bps.\n",
1132                avctx->bit_rate);
1133
1134     } else {
1135         av_assert0(0 && "Invalid RC mode.");
1136     }
1137
1138     if (opt->quality > 0) {
1139 #if VA_CHECK_VERSION(0, 36, 0)
1140         priv->quality_params.misc.type =
1141             VAEncMiscParameterTypeQualityLevel;
1142         priv->quality_params.quality.quality_level = opt->quality;
1143
1144         ctx->global_params[ctx->nb_global_params] =
1145             &priv->quality_params.misc;
1146         ctx->global_params_size[ctx->nb_global_params++] =
1147             sizeof(priv->quality_params);
1148 #else
1149         av_log(avctx, AV_LOG_WARNING, "The encode quality option is not "
1150                "supported with this VAAPI version.\n");
1151 #endif
1152     }
1153
1154     return 0;
1155 }
1156
1157 static const VAAPIEncodeType vaapi_encode_type_h264 = {
1158     .priv_data_size        = sizeof(VAAPIEncodeH264Context),
1159
1160     .configure             = &vaapi_encode_h264_configure,
1161
1162     .sequence_params_size  = sizeof(VAEncSequenceParameterBufferH264),
1163     .init_sequence_params  = &vaapi_encode_h264_init_sequence_params,
1164
1165     .picture_params_size   = sizeof(VAEncPictureParameterBufferH264),
1166     .init_picture_params   = &vaapi_encode_h264_init_picture_params,
1167
1168     .slice_params_size     = sizeof(VAEncSliceParameterBufferH264),
1169     .init_slice_params     = &vaapi_encode_h264_init_slice_params,
1170
1171     .sequence_header_type  = VAEncPackedHeaderSequence,
1172     .write_sequence_header = &vaapi_encode_h264_write_sequence_header,
1173
1174     .slice_header_type     = VAEncPackedHeaderH264_Slice,
1175     .write_slice_header    = &vaapi_encode_h264_write_slice_header,
1176
1177     .write_extra_header    = &vaapi_encode_h264_write_extra_header,
1178 };
1179
1180 static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
1181 {
1182     VAAPIEncodeContext     *ctx = avctx->priv_data;
1183     VAAPIEncodeH264Options *opt =
1184         (VAAPIEncodeH264Options*)ctx->codec_options_data;
1185
1186     ctx->codec = &vaapi_encode_type_h264;
1187
1188     switch (avctx->profile) {
1189     case FF_PROFILE_H264_CONSTRAINED_BASELINE:
1190         ctx->va_profile = VAProfileH264ConstrainedBaseline;
1191         break;
1192     case FF_PROFILE_H264_BASELINE:
1193         ctx->va_profile = VAProfileH264Baseline;
1194         break;
1195     case FF_PROFILE_H264_MAIN:
1196         ctx->va_profile = VAProfileH264Main;
1197         break;
1198     case FF_PROFILE_H264_EXTENDED:
1199         av_log(avctx, AV_LOG_ERROR, "H.264 extended profile "
1200                "is not supported.\n");
1201         return AVERROR_PATCHWELCOME;
1202     case FF_PROFILE_UNKNOWN:
1203     case FF_PROFILE_H264_HIGH:
1204         ctx->va_profile = VAProfileH264High;
1205         break;
1206     case FF_PROFILE_H264_HIGH_10:
1207     case FF_PROFILE_H264_HIGH_10_INTRA:
1208         av_log(avctx, AV_LOG_ERROR, "H.264 10-bit profiles "
1209                "are not supported.\n");
1210         return AVERROR_PATCHWELCOME;
1211     case FF_PROFILE_H264_HIGH_422:
1212     case FF_PROFILE_H264_HIGH_422_INTRA:
1213     case FF_PROFILE_H264_HIGH_444:
1214     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
1215     case FF_PROFILE_H264_HIGH_444_INTRA:
1216     case FF_PROFILE_H264_CAVLC_444:
1217         av_log(avctx, AV_LOG_ERROR, "H.264 non-4:2:0 profiles "
1218                "are not supported.\n");
1219         return AVERROR_PATCHWELCOME;
1220     default:
1221         av_log(avctx, AV_LOG_ERROR, "Unknown H.264 profile %d.\n",
1222                avctx->profile);
1223         return AVERROR(EINVAL);
1224     }
1225     if (opt->low_power) {
1226 #if VA_CHECK_VERSION(0, 39, 2)
1227         ctx->va_entrypoint = VAEntrypointEncSliceLP;
1228 #else
1229         av_log(avctx, AV_LOG_ERROR, "Low-power encoding is not "
1230                "supported with this VAAPI version.\n");
1231         return AVERROR(EINVAL);
1232 #endif
1233     } else {
1234         ctx->va_entrypoint = VAEntrypointEncSlice;
1235     }
1236
1237     // Only 8-bit encode is supported.
1238     ctx->va_rt_format = VA_RT_FORMAT_YUV420;
1239
1240     if (avctx->bit_rate > 0)
1241         ctx->va_rc_mode = VA_RC_CBR;
1242     else
1243         ctx->va_rc_mode = VA_RC_CQP;
1244
1245     ctx->va_packed_headers =
1246         VA_ENC_PACKED_HEADER_SEQUENCE | // SPS and PPS.
1247         VA_ENC_PACKED_HEADER_SLICE    | // Slice headers.
1248         VA_ENC_PACKED_HEADER_MISC;      // SEI.
1249
1250     ctx->surface_width  = FFALIGN(avctx->width,  16);
1251     ctx->surface_height = FFALIGN(avctx->height, 16);
1252
1253     return ff_vaapi_encode_init(avctx);
1254 }
1255
1256 #define OFFSET(x) (offsetof(VAAPIEncodeContext, codec_options_data) + \
1257                    offsetof(VAAPIEncodeH264Options, x))
1258 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
1259 static const AVOption vaapi_encode_h264_options[] = {
1260     { "qp", "Constant QP (for P-frames; scaled by qfactor/qoffset for I/B)",
1261       OFFSET(qp), AV_OPT_TYPE_INT, { .i64 = 20 }, 0, 52, FLAGS },
1262     { "quality", "Set encode quality (trades off against speed, higher is faster)",
1263       OFFSET(quality), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 8, FLAGS },
1264     { "low_power", "Use low-power encoding mode (experimental: only supported "
1265       "on some platforms, does not support all features)",
1266       OFFSET(low_power), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, FLAGS },
1267     { NULL },
1268 };
1269
1270 static const AVCodecDefault vaapi_encode_h264_defaults[] = {
1271     { "profile",        "100" },
1272     { "level",          "51"  },
1273     { "b",              "0"   },
1274     { "bf",             "2"   },
1275     { "g",              "120" },
1276     { "i_qfactor",      "1.0" },
1277     { "i_qoffset",      "0.0" },
1278     { "b_qfactor",      "1.2" },
1279     { "b_qoffset",      "0.0" },
1280     { NULL },
1281 };
1282
1283 static const AVClass vaapi_encode_h264_class = {
1284     .class_name = "h264_vaapi",
1285     .item_name  = av_default_item_name,
1286     .option     = vaapi_encode_h264_options,
1287     .version    = LIBAVUTIL_VERSION_INT,
1288 };
1289
1290 AVCodec ff_h264_vaapi_encoder = {
1291     .name           = "h264_vaapi",
1292     .long_name      = NULL_IF_CONFIG_SMALL("H.264/AVC (VAAPI)"),
1293     .type           = AVMEDIA_TYPE_VIDEO,
1294     .id             = AV_CODEC_ID_H264,
1295     .priv_data_size = (sizeof(VAAPIEncodeContext) +
1296                        sizeof(VAAPIEncodeH264Options)),
1297     .init           = &vaapi_encode_h264_init,
1298     .encode2        = &ff_vaapi_encode2,
1299     .close          = &ff_vaapi_encode_close,
1300     .priv_class     = &vaapi_encode_h264_class,
1301     .capabilities   = AV_CODEC_CAP_DELAY,
1302     .defaults       = vaapi_encode_h264_defaults,
1303     .pix_fmts = (const enum AVPixelFormat[]) {
1304         AV_PIX_FMT_VAAPI,
1305         AV_PIX_FMT_NONE,
1306     },
1307 };