vaapi_h264: Add constant-bitrate encode support
[ffmpeg.git] / libavcodec / vaapi_encode_h264.c
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 "internal.h"
30 #include "vaapi_encode.h"
31 #include "vaapi_encode_h26x.h"
32
33 enum {
34     SLICE_TYPE_P  = 0,
35     SLICE_TYPE_B  = 1,
36     SLICE_TYPE_I  = 2,
37     SLICE_TYPE_SP = 3,
38     SLICE_TYPE_SI = 4,
39 };
40
41 // This structure contains all possibly-useful per-sequence syntax elements
42 // which are not already contained in the various VAAPI structures.
43 typedef struct VAAPIEncodeH264MiscSequenceParams {
44     unsigned int profile_idc;
45     char constraint_set0_flag;
46     char constraint_set1_flag;
47     char constraint_set2_flag;
48     char constraint_set3_flag;
49     char constraint_set4_flag;
50     char constraint_set5_flag;
51
52     char separate_colour_plane_flag;
53     char qpprime_y_zero_transform_bypass_flag;
54
55     char gaps_in_frame_num_allowed_flag;
56     char delta_pic_order_always_zero_flag;
57     char bottom_field_pic_order_in_frame_present_flag;
58
59     unsigned int num_slice_groups_minus1;
60     unsigned int slice_group_map_type;
61
62     int pic_init_qs_minus26;
63
64     char vui_parameters_present_flag;
65 } VAAPIEncodeH264MiscSequenceParams;
66
67 // This structure contains all possibly-useful per-slice syntax elements
68 // which are not already contained in the various VAAPI structures.
69 typedef struct VAAPIEncodeH264MiscSliceParams {
70     unsigned int nal_unit_type;
71     unsigned int nal_ref_idc;
72
73     unsigned int colour_plane_id;
74     char field_pic_flag;
75     char bottom_field_flag;
76
77     unsigned int redundant_pic_cnt;
78
79     char sp_for_switch_flag;
80     int slice_qs_delta;
81
82     char ref_pic_list_modification_flag_l0;
83     char ref_pic_list_modification_flag_l1;
84
85     char no_output_of_prior_pics_flag;
86     char long_term_reference_flag;
87     char adaptive_ref_pic_marking_mode_flag;
88 } VAAPIEncodeH264MiscSliceParams;
89
90 typedef struct VAAPIEncodeH264Slice {
91     VAAPIEncodeH264MiscSliceParams misc_slice_params;
92 } VAAPIEncodeH264Slice;
93
94 typedef struct VAAPIEncodeH264Context {
95     VAAPIEncodeH264MiscSequenceParams misc_sequence_params;
96
97     int mb_width;
98     int mb_height;
99
100     int fixed_qp_idr;
101     int fixed_qp_p;
102     int fixed_qp_b;
103
104     int64_t idr_pic_count;
105     int64_t last_idr_frame;
106
107     // Rate control configuration.
108     struct {
109         VAEncMiscParameterBuffer misc;
110         VAEncMiscParameterRateControl rc;
111     } rc_params;
112     struct {
113         VAEncMiscParameterBuffer misc;
114         VAEncMiscParameterHRD hrd;
115     } hrd_params;
116 } VAAPIEncodeH264Context;
117
118
119 #define vseq_var(name)     vseq->name, name
120 #define vseq_field(name)   vseq->seq_fields.bits.name, name
121 #define vpic_var(name)     vpic->name, name
122 #define vpic_field(name)   vpic->pic_fields.bits.name, name
123 #define vslice_var(name)   vslice->name, name
124 #define vslice_field(name) vslice->slice_fields.bits.name, name
125 #define mseq_var(name)     mseq->name, name
126 #define mslice_var(name)   mslice->name, name
127
128 static void vaapi_encode_h264_write_nal_header(PutBitContext *pbc,
129                                                int nal_unit_type, int nal_ref_idc)
130 {
131     u(1, 0, forbidden_zero_bit);
132     u(2, nal_ref_idc, nal_ref_idc);
133     u(5, nal_unit_type, nal_unit_type);
134 }
135
136 static void vaapi_encode_h264_write_trailing_rbsp(PutBitContext *pbc)
137 {
138     u(1, 1, rbsp_stop_one_bit);
139     while (put_bits_count(pbc) & 7)
140         u(1, 0, rbsp_alignment_zero_bit);
141 }
142
143 static void vaapi_encode_h264_write_sps(PutBitContext *pbc,
144                                         VAAPIEncodeContext *ctx)
145 {
146     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
147     VAAPIEncodeH264Context            *priv = ctx->priv_data;
148     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
149     int i;
150
151     vaapi_encode_h264_write_nal_header(pbc, NAL_SPS, 3);
152
153     u(8, mseq_var(profile_idc));
154     u(1, mseq_var(constraint_set0_flag));
155     u(1, mseq_var(constraint_set1_flag));
156     u(1, mseq_var(constraint_set2_flag));
157     u(1, mseq_var(constraint_set3_flag));
158     u(1, mseq_var(constraint_set4_flag));
159     u(1, mseq_var(constraint_set5_flag));
160     u(2, 0, reserved_zero_2bits);
161
162     u(8, vseq_var(level_idc));
163
164     ue(vseq_var(seq_parameter_set_id));
165
166     if (mseq->profile_idc == 100 || mseq->profile_idc == 110 ||
167         mseq->profile_idc == 122 || mseq->profile_idc == 244 ||
168         mseq->profile_idc ==  44 || mseq->profile_idc ==  83 ||
169         mseq->profile_idc ==  86 || mseq->profile_idc == 118 ||
170         mseq->profile_idc == 128 || mseq->profile_idc == 138) {
171         ue(vseq_field(chroma_format_idc));
172
173         if (vseq->seq_fields.bits.chroma_format_idc == 3)
174             u(1, mseq_var(separate_colour_plane_flag));
175
176         ue(vseq_var(bit_depth_luma_minus8));
177         ue(vseq_var(bit_depth_chroma_minus8));
178
179         u(1, mseq_var(qpprime_y_zero_transform_bypass_flag));
180
181         u(1, vseq_field(seq_scaling_matrix_present_flag));
182         if (vseq->seq_fields.bits.seq_scaling_matrix_present_flag) {
183             av_assert0(0 && "scaling matrices not supported");
184         }
185     }
186
187     ue(vseq_field(log2_max_frame_num_minus4));
188     ue(vseq_field(pic_order_cnt_type));
189
190     if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
191         ue(vseq_field(log2_max_pic_order_cnt_lsb_minus4));
192     } else if (vseq->seq_fields.bits.pic_order_cnt_type == 1) {
193         u(1, mseq_var(delta_pic_order_always_zero_flag));
194         se(vseq_var(offset_for_non_ref_pic));
195         se(vseq_var(offset_for_top_to_bottom_field));
196         ue(vseq_var(num_ref_frames_in_pic_order_cnt_cycle));
197
198         for (i = 0; i < vseq->num_ref_frames_in_pic_order_cnt_cycle; i++)
199             se(vseq_var(offset_for_ref_frame[i]));
200     }
201
202     ue(vseq_var(max_num_ref_frames));
203     u(1, mseq_var(gaps_in_frame_num_allowed_flag));
204
205     ue(vseq->picture_width_in_mbs  - 1, pic_width_in_mbs_minus1);
206     ue(vseq->picture_height_in_mbs - 1, pic_height_in_mbs_minus1);
207
208     u(1, vseq_field(frame_mbs_only_flag));
209     if (!vseq->seq_fields.bits.frame_mbs_only_flag)
210         u(1, vseq_field(mb_adaptive_frame_field_flag));
211
212     u(1, vseq_field(direct_8x8_inference_flag));
213
214     u(1, vseq_var(frame_cropping_flag));
215     if (vseq->frame_cropping_flag) {
216         ue(vseq_var(frame_crop_left_offset));
217         ue(vseq_var(frame_crop_right_offset));
218         ue(vseq_var(frame_crop_top_offset));
219         ue(vseq_var(frame_crop_bottom_offset));
220     }
221
222     u(1, mseq_var(vui_parameters_present_flag));
223
224     vaapi_encode_h264_write_trailing_rbsp(pbc);
225 }
226
227 static void vaapi_encode_h264_write_pps(PutBitContext *pbc,
228                                         VAAPIEncodeContext *ctx)
229 {
230     VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
231     VAAPIEncodeH264Context            *priv = ctx->priv_data;
232     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
233
234     vaapi_encode_h264_write_nal_header(pbc, NAL_PPS, 3);
235
236     ue(vpic_var(pic_parameter_set_id));
237     ue(vpic_var(seq_parameter_set_id));
238
239     u(1, vpic_field(entropy_coding_mode_flag));
240     u(1, mseq_var(bottom_field_pic_order_in_frame_present_flag));
241
242     ue(mseq_var(num_slice_groups_minus1));
243     if (mseq->num_slice_groups_minus1 > 0) {
244         ue(mseq_var(slice_group_map_type));
245         av_assert0(0 && "slice groups not supported");
246     }
247
248     ue(vpic_var(num_ref_idx_l0_active_minus1));
249     ue(vpic_var(num_ref_idx_l1_active_minus1));
250
251     u(1, vpic_field(weighted_pred_flag));
252     u(2, vpic_field(weighted_bipred_idc));
253
254     se(vpic->pic_init_qp - 26, pic_init_qp_minus26);
255     se(mseq_var(pic_init_qs_minus26));
256     se(vpic_var(chroma_qp_index_offset));
257
258     u(1, vpic_field(deblocking_filter_control_present_flag));
259     u(1, vpic_field(constrained_intra_pred_flag));
260     u(1, vpic_field(redundant_pic_cnt_present_flag));
261     u(1, vpic_field(transform_8x8_mode_flag));
262
263     u(1, vpic_field(pic_scaling_matrix_present_flag));
264     if (vpic->pic_fields.bits.pic_scaling_matrix_present_flag) {
265         av_assert0(0 && "scaling matrices not supported");
266     }
267
268     se(vpic_var(second_chroma_qp_index_offset));
269
270     vaapi_encode_h264_write_trailing_rbsp(pbc);
271 }
272
273 static void vaapi_encode_h264_write_slice_header2(PutBitContext *pbc,
274                                                   VAAPIEncodeContext *ctx,
275                                                   VAAPIEncodePicture *pic,
276                                                   VAAPIEncodeSlice *slice)
277 {
278     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
279     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
280     VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
281     VAAPIEncodeH264Context            *priv = ctx->priv_data;
282     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
283     VAAPIEncodeH264Slice            *pslice = slice->priv_data;
284     VAAPIEncodeH264MiscSliceParams  *mslice = &pslice->misc_slice_params;
285
286     vaapi_encode_h264_write_nal_header(pbc, mslice->nal_unit_type,
287                                        mslice->nal_ref_idc);
288
289     ue(vslice->macroblock_address, first_mb_in_slice);
290     ue(vslice_var(slice_type));
291     ue(vpic_var(pic_parameter_set_id));
292
293     if (mseq->separate_colour_plane_flag) {
294         u(2, mslice_var(colour_plane_id));
295     }
296
297     u(4 + vseq->seq_fields.bits.log2_max_frame_num_minus4,
298       (vpic->frame_num &
299        ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1)),
300       frame_num);
301
302     if (!vseq->seq_fields.bits.frame_mbs_only_flag) {
303         u(1, mslice_var(field_pic_flag));
304         if (mslice->field_pic_flag)
305             u(1, mslice_var(bottom_field_flag));
306     }
307
308     if (vpic->pic_fields.bits.idr_pic_flag) {
309         ue(vslice_var(idr_pic_id));
310     }
311
312     if (vseq->seq_fields.bits.pic_order_cnt_type == 0) {
313         u(4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4,
314           vslice_var(pic_order_cnt_lsb));
315         if (mseq->bottom_field_pic_order_in_frame_present_flag &&
316             !mslice->field_pic_flag) {
317             se(vslice_var(delta_pic_order_cnt_bottom));
318         }
319     }
320
321     if (vseq->seq_fields.bits.pic_order_cnt_type == 1 &&
322         !vseq->seq_fields.bits.delta_pic_order_always_zero_flag) {
323         se(vslice_var(delta_pic_order_cnt[0]));
324         if (mseq->bottom_field_pic_order_in_frame_present_flag &&
325             !mslice->field_pic_flag) {
326             se(vslice_var(delta_pic_order_cnt[1]));
327         }
328     }
329
330     if (vpic->pic_fields.bits.redundant_pic_cnt_present_flag) {
331         ue(mslice_var(redundant_pic_cnt));
332     }
333
334     if (vslice->slice_type == SLICE_TYPE_B) {
335         u(1, vslice_var(direct_spatial_mv_pred_flag));
336     }
337
338     if (vslice->slice_type == SLICE_TYPE_P ||
339         vslice->slice_type == SLICE_TYPE_SP ||
340         vslice->slice_type == SLICE_TYPE_B) {
341         u(1, vslice_var(num_ref_idx_active_override_flag));
342         if (vslice->num_ref_idx_active_override_flag) {
343             ue(vslice_var(num_ref_idx_l0_active_minus1));
344             if (vslice->slice_type == SLICE_TYPE_B)
345                 ue(vslice_var(num_ref_idx_l1_active_minus1));
346         }
347     }
348
349     if (mslice->nal_unit_type == 20 || mslice->nal_unit_type == 21) {
350         av_assert0(0 && "no MVC support");
351     } else {
352         if (vslice->slice_type % 5 != 2 && vslice->slice_type % 5 != 4) {
353             u(1, mslice_var(ref_pic_list_modification_flag_l0));
354             if (mslice->ref_pic_list_modification_flag_l0) {
355                 av_assert0(0 && "ref pic list modification");
356             }
357         }
358         if (vslice->slice_type % 5 == 1) {
359             u(1, mslice_var(ref_pic_list_modification_flag_l1));
360             if (mslice->ref_pic_list_modification_flag_l1) {
361                 av_assert0(0 && "ref pic list modification");
362             }
363         }
364     }
365
366     if ((vpic->pic_fields.bits.weighted_pred_flag &&
367          (vslice->slice_type == SLICE_TYPE_P ||
368           vslice->slice_type == SLICE_TYPE_SP)) ||
369         (vpic->pic_fields.bits.weighted_bipred_idc == 1 &&
370          vslice->slice_type == SLICE_TYPE_B)) {
371         av_assert0(0 && "prediction weights not supported");
372     }
373
374     av_assert0(mslice->nal_ref_idc > 0 ==
375                vpic->pic_fields.bits.reference_pic_flag);
376     if (mslice->nal_ref_idc != 0) {
377         if (vpic->pic_fields.bits.idr_pic_flag) {
378             u(1, mslice_var(no_output_of_prior_pics_flag));
379             u(1, mslice_var(long_term_reference_flag));
380         } else {
381             u(1, mslice_var(adaptive_ref_pic_marking_mode_flag));
382             if (mslice->adaptive_ref_pic_marking_mode_flag) {
383                 av_assert0(0 && "MMCOs not supported");
384             }
385         }
386     }
387
388     if (vpic->pic_fields.bits.entropy_coding_mode_flag &&
389         vslice->slice_type != SLICE_TYPE_I &&
390         vslice->slice_type != SLICE_TYPE_SI) {
391         ue(vslice_var(cabac_init_idc));
392     }
393
394     se(vslice_var(slice_qp_delta));
395     if (vslice->slice_type == SLICE_TYPE_SP ||
396         vslice->slice_type == SLICE_TYPE_SI) {
397         if (vslice->slice_type == SLICE_TYPE_SP)
398             u(1, mslice_var(sp_for_switch_flag));
399         se(mslice_var(slice_qs_delta));
400     }
401
402     if (vpic->pic_fields.bits.deblocking_filter_control_present_flag) {
403         ue(vslice_var(disable_deblocking_filter_idc));
404         if (vslice->disable_deblocking_filter_idc != 1) {
405             se(vslice_var(slice_alpha_c0_offset_div2));
406             se(vslice_var(slice_beta_offset_div2));
407         }
408     }
409
410     if (mseq->num_slice_groups_minus1 > 0 &&
411         mseq->slice_group_map_type >= 3 && mseq->slice_group_map_type <= 5) {
412         av_assert0(0 && "slice groups not supported");
413     }
414
415     // No alignment - this need not be a byte boundary.
416 }
417
418 static int vaapi_encode_h264_write_sequence_header(AVCodecContext *avctx,
419                                                    char *data, size_t *data_len)
420 {
421     VAAPIEncodeContext *ctx = avctx->priv_data;
422     PutBitContext pbc;
423     char tmp[256];
424     int err;
425     size_t nal_len, bit_len, bit_pos, next_len;
426
427     bit_len = *data_len;
428     bit_pos = 0;
429
430     init_put_bits(&pbc, tmp, sizeof(tmp));
431     vaapi_encode_h264_write_sps(&pbc, ctx);
432     nal_len = put_bits_count(&pbc);
433     flush_put_bits(&pbc);
434
435     next_len = bit_len - bit_pos;
436     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
437                                                        &next_len,
438                                                        tmp, nal_len);
439     if (err < 0)
440         return err;
441     bit_pos += next_len;
442
443     init_put_bits(&pbc, tmp, sizeof(tmp));
444     vaapi_encode_h264_write_pps(&pbc, ctx);
445     nal_len = put_bits_count(&pbc);
446     flush_put_bits(&pbc);
447
448     next_len = bit_len - bit_pos;
449     err = ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data + bit_pos / 8,
450                                                        &next_len,
451                                                        tmp, nal_len);
452     if (err < 0)
453         return err;
454     bit_pos += next_len;
455
456     *data_len = bit_pos;
457     return 0;
458 }
459
460 static int vaapi_encode_h264_write_slice_header(AVCodecContext *avctx,
461                                                 VAAPIEncodePicture *pic,
462                                                 VAAPIEncodeSlice *slice,
463                                                 char *data, size_t *data_len)
464 {
465     VAAPIEncodeContext *ctx = avctx->priv_data;
466     PutBitContext pbc;
467     char tmp[256];
468     size_t header_len;
469
470     init_put_bits(&pbc, tmp, sizeof(tmp));
471     vaapi_encode_h264_write_slice_header2(&pbc, ctx, pic, slice);
472     header_len = put_bits_count(&pbc);
473     flush_put_bits(&pbc);
474
475     return ff_vaapi_encode_h26x_nal_unit_to_byte_stream(data, data_len,
476                                                         tmp, header_len);
477 }
478
479 static int vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
480 {
481     VAAPIEncodeContext                 *ctx = avctx->priv_data;
482     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
483     VAEncPictureParameterBufferH264   *vpic = ctx->codec_picture_params;
484     VAAPIEncodeH264Context            *priv = ctx->priv_data;
485     VAAPIEncodeH264MiscSequenceParams *mseq = &priv->misc_sequence_params;
486     int i;
487
488     {
489         vseq->seq_parameter_set_id = 0;
490
491         vseq->level_idc = avctx->level;
492
493         vseq->max_num_ref_frames = 2;
494
495         vseq->picture_width_in_mbs  = priv->mb_width;
496         vseq->picture_height_in_mbs = priv->mb_height;
497
498         vseq->seq_fields.bits.chroma_format_idc = 1;
499         vseq->seq_fields.bits.frame_mbs_only_flag = 1;
500         vseq->seq_fields.bits.direct_8x8_inference_flag = 1;
501         vseq->seq_fields.bits.log2_max_frame_num_minus4 = 4;
502         vseq->seq_fields.bits.pic_order_cnt_type = 0;
503
504         if (ctx->input_width  != ctx->aligned_width ||
505             ctx->input_height != ctx->aligned_height) {
506             vseq->frame_cropping_flag = 1;
507
508             vseq->frame_crop_left_offset   = 0;
509             vseq->frame_crop_right_offset  =
510                 (ctx->aligned_width - ctx->input_width) / 2;
511             vseq->frame_crop_top_offset    = 0;
512             vseq->frame_crop_bottom_offset =
513                 (ctx->aligned_height - ctx->input_height) / 2;
514         } else {
515             vseq->frame_cropping_flag = 0;
516         }
517
518         vseq->bits_per_second = avctx->bit_rate;
519         if (avctx->framerate.num > 0 && avctx->framerate.den > 0) {
520             vseq->num_units_in_tick = avctx->framerate.num;
521             vseq->time_scale        = 2 * avctx->framerate.den;
522         } else {
523             vseq->num_units_in_tick = avctx->time_base.num;
524             vseq->time_scale        = 2 * avctx->time_base.den;
525         }
526
527         vseq->intra_period     = ctx->p_per_i * (ctx->b_per_p + 1);
528         vseq->intra_idr_period = vseq->intra_period;
529         vseq->ip_period        = ctx->b_per_p + 1;
530     }
531
532     {
533         vpic->CurrPic.picture_id = VA_INVALID_ID;
534         vpic->CurrPic.flags      = VA_PICTURE_H264_INVALID;
535
536         for (i = 0; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
537             vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
538             vpic->ReferenceFrames[i].flags      = VA_PICTURE_H264_INVALID;
539         }
540
541         vpic->coded_buf = VA_INVALID_ID;
542
543         vpic->pic_parameter_set_id = 0;
544         vpic->seq_parameter_set_id = 0;
545
546         vpic->num_ref_idx_l0_active_minus1 = 0;
547         vpic->num_ref_idx_l1_active_minus1 = 0;
548
549         vpic->pic_fields.bits.entropy_coding_mode_flag =
550             ((avctx->profile & 0xff) != 66);
551         vpic->pic_fields.bits.weighted_pred_flag = 0;
552         vpic->pic_fields.bits.weighted_bipred_idc = 0;
553         vpic->pic_fields.bits.transform_8x8_mode_flag =
554             ((avctx->profile & 0xff) >= 100);
555
556         vpic->pic_init_qp = priv->fixed_qp_idr;
557     }
558
559     {
560         mseq->profile_idc = avctx->profile & 0xff;
561
562         if (avctx->profile & FF_PROFILE_H264_CONSTRAINED)
563             mseq->constraint_set1_flag = 1;
564         if (avctx->profile & FF_PROFILE_H264_INTRA)
565             mseq->constraint_set3_flag = 1;
566     }
567
568     return 0;
569 }
570
571 static int vaapi_encode_h264_init_picture_params(AVCodecContext *avctx,
572                                                  VAAPIEncodePicture *pic)
573 {
574     VAAPIEncodeContext                *ctx = avctx->priv_data;
575     VAEncSequenceParameterBufferH264 *vseq = ctx->codec_sequence_params;
576     VAEncPictureParameterBufferH264  *vpic = pic->codec_picture_params;
577     VAAPIEncodeH264Context           *priv = ctx->priv_data;
578     int i;
579
580     if (pic->type == PICTURE_TYPE_IDR) {
581         av_assert0(pic->display_order == pic->encode_order);
582         priv->last_idr_frame = pic->display_order;
583     } else {
584         av_assert0(pic->display_order > priv->last_idr_frame);
585     }
586
587     vpic->frame_num = (pic->encode_order - priv->last_idr_frame) &
588         ((1 << (4 + vseq->seq_fields.bits.log2_max_frame_num_minus4)) - 1);
589
590     vpic->CurrPic.picture_id          = pic->recon_surface;
591     vpic->CurrPic.frame_idx           = vpic->frame_num;
592     vpic->CurrPic.flags               = 0;
593     vpic->CurrPic.TopFieldOrderCnt    = pic->display_order;
594     vpic->CurrPic.BottomFieldOrderCnt = pic->display_order;
595
596     for (i = 0; i < pic->nb_refs; i++) {
597         VAAPIEncodePicture *ref = pic->refs[i];
598         av_assert0(ref && ref->encode_order >= priv->last_idr_frame);
599         vpic->ReferenceFrames[i].picture_id = ref->recon_surface;
600         vpic->ReferenceFrames[i].frame_idx =
601             ref->encode_order - priv->last_idr_frame;
602         vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_SHORT_TERM_REFERENCE;
603         vpic->ReferenceFrames[i].TopFieldOrderCnt    = ref->display_order;
604         vpic->ReferenceFrames[i].BottomFieldOrderCnt = ref->display_order;
605     }
606     for (; i < FF_ARRAY_ELEMS(vpic->ReferenceFrames); i++) {
607         vpic->ReferenceFrames[i].picture_id = VA_INVALID_ID;
608         vpic->ReferenceFrames[i].flags = VA_PICTURE_H264_INVALID;
609     }
610
611     vpic->coded_buf = pic->output_buffer;
612
613     vpic->pic_fields.bits.idr_pic_flag = (pic->type == PICTURE_TYPE_IDR);
614     vpic->pic_fields.bits.reference_pic_flag = (pic->type != PICTURE_TYPE_B);
615
616     pic->nb_slices = 1;
617
618     return 0;
619 }
620
621 static int vaapi_encode_h264_init_slice_params(AVCodecContext *avctx,
622                                                VAAPIEncodePicture *pic,
623                                                VAAPIEncodeSlice *slice)
624 {
625     VAAPIEncodeContext                 *ctx = avctx->priv_data;
626     VAEncSequenceParameterBufferH264  *vseq = ctx->codec_sequence_params;
627     VAEncPictureParameterBufferH264   *vpic = pic->codec_picture_params;
628     VAEncSliceParameterBufferH264   *vslice = slice->codec_slice_params;
629     VAAPIEncodeH264Context            *priv = ctx->priv_data;
630     VAAPIEncodeH264Slice            *pslice;
631     VAAPIEncodeH264MiscSliceParams  *mslice;
632     int i;
633
634     slice->priv_data = av_mallocz(sizeof(*pslice));
635     if (!slice->priv_data)
636         return AVERROR(ENOMEM);
637     pslice = slice->priv_data;
638     mslice = &pslice->misc_slice_params;
639
640     if (pic->type == PICTURE_TYPE_IDR)
641         mslice->nal_unit_type = NAL_IDR_SLICE;
642     else
643         mslice->nal_unit_type = NAL_SLICE;
644
645     switch (pic->type) {
646     case PICTURE_TYPE_IDR:
647         vslice->slice_type  = SLICE_TYPE_I;
648         mslice->nal_ref_idc = 3;
649         break;
650     case PICTURE_TYPE_I:
651         vslice->slice_type  = SLICE_TYPE_I;
652         mslice->nal_ref_idc = 2;
653         break;
654     case PICTURE_TYPE_P:
655         vslice->slice_type  = SLICE_TYPE_P;
656         mslice->nal_ref_idc = 1;
657         break;
658     case PICTURE_TYPE_B:
659         vslice->slice_type  = SLICE_TYPE_B;
660         mslice->nal_ref_idc = 0;
661         break;
662     default:
663         av_assert0(0 && "invalid picture type");
664     }
665
666     // Only one slice per frame.
667     vslice->macroblock_address = 0;
668     vslice->num_macroblocks = priv->mb_width * priv->mb_height;
669
670     vslice->macroblock_info = VA_INVALID_ID;
671
672     vslice->pic_parameter_set_id = vpic->pic_parameter_set_id;
673     vslice->idr_pic_id = priv->idr_pic_count++;
674
675     vslice->pic_order_cnt_lsb = pic->display_order &
676         ((1 << (4 + vseq->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4)) - 1);
677
678     for (i = 0; i < FF_ARRAY_ELEMS(vslice->RefPicList0); i++) {
679         vslice->RefPicList0[i].picture_id = VA_INVALID_ID;
680         vslice->RefPicList0[i].flags      = VA_PICTURE_H264_INVALID;
681         vslice->RefPicList1[i].picture_id = VA_INVALID_ID;
682         vslice->RefPicList1[i].flags      = VA_PICTURE_H264_INVALID;
683     }
684
685     av_assert0(pic->nb_refs <= 2);
686     if (pic->nb_refs >= 1) {
687         // Backward reference for P or B frame.
688         av_assert0(pic->type == PICTURE_TYPE_P ||
689                    pic->type == PICTURE_TYPE_B);
690
691         vslice->num_ref_idx_l0_active_minus1 = 0;
692         vslice->RefPicList0[0] = vpic->ReferenceFrames[0];
693     }
694     if (pic->nb_refs >= 2) {
695         // Forward reference for B frame.
696         av_assert0(pic->type == PICTURE_TYPE_B);
697
698         vslice->num_ref_idx_l1_active_minus1 = 0;
699         vslice->RefPicList1[0] = vpic->ReferenceFrames[1];
700     }
701
702     if (pic->type == PICTURE_TYPE_B)
703         vslice->slice_qp_delta = priv->fixed_qp_b - vpic->pic_init_qp;
704     else if (pic->type == PICTURE_TYPE_P)
705         vslice->slice_qp_delta = priv->fixed_qp_p - vpic->pic_init_qp;
706     else
707         vslice->slice_qp_delta = priv->fixed_qp_idr - vpic->pic_init_qp;
708
709     vslice->direct_spatial_mv_pred_flag = 1;
710
711     return 0;
712 }
713
714 static av_cold int vaapi_encode_h264_init_constant_bitrate(AVCodecContext *avctx)
715 {
716     VAAPIEncodeContext      *ctx = avctx->priv_data;
717     VAAPIEncodeH264Context *priv = ctx->priv_data;
718     int hrd_buffer_size;
719     int hrd_initial_buffer_fullness;
720
721     if (avctx->rc_buffer_size)
722         hrd_buffer_size = avctx->rc_buffer_size;
723     else
724         hrd_buffer_size = avctx->bit_rate;
725     if (avctx->rc_initial_buffer_occupancy)
726         hrd_initial_buffer_fullness = avctx->rc_initial_buffer_occupancy;
727     else
728         hrd_initial_buffer_fullness = hrd_buffer_size * 3 / 4;
729
730     priv->rc_params.misc.type = VAEncMiscParameterTypeRateControl;
731     priv->rc_params.rc = (VAEncMiscParameterRateControl) {
732         .bits_per_second   = avctx->bit_rate,
733         .target_percentage = 66,
734         .window_size       = 1000,
735         .initial_qp        = (avctx->qmax >= 0 ? avctx->qmax : 40),
736         .min_qp            = (avctx->qmin >= 0 ? avctx->qmin : 18),
737         .basic_unit_size   = 0,
738     };
739     ctx->global_params[ctx->nb_global_params] =
740         &priv->rc_params.misc;
741     ctx->global_params_size[ctx->nb_global_params++] =
742         sizeof(priv->rc_params);
743
744     priv->hrd_params.misc.type = VAEncMiscParameterTypeHRD;
745     priv->hrd_params.hrd = (VAEncMiscParameterHRD) {
746         .initial_buffer_fullness = hrd_initial_buffer_fullness,
747         .buffer_size             = hrd_buffer_size,
748     };
749     ctx->global_params[ctx->nb_global_params] =
750         &priv->hrd_params.misc;
751     ctx->global_params_size[ctx->nb_global_params++] =
752         sizeof(priv->hrd_params);
753
754     // These still need to be  set for pic_init_qp/slice_qp_delta.
755     priv->fixed_qp_idr = 26;
756     priv->fixed_qp_p   = 26;
757     priv->fixed_qp_b   = 26;
758
759     av_log(avctx, AV_LOG_DEBUG, "Using constant-bitrate = %d bps.\n",
760            avctx->bit_rate);
761     return 0;
762 }
763
764 static av_cold int vaapi_encode_h264_init_fixed_qp(AVCodecContext *avctx)
765 {
766     VAAPIEncodeContext      *ctx = avctx->priv_data;
767     VAAPIEncodeH264Context *priv = ctx->priv_data;
768
769     priv->fixed_qp_p = avctx->global_quality;
770     if (avctx->i_quant_factor > 0.0)
771         priv->fixed_qp_idr = (int)((priv->fixed_qp_p * avctx->i_quant_factor +
772                                     avctx->i_quant_offset) + 0.5);
773     else
774         priv->fixed_qp_idr = priv->fixed_qp_p;
775     if (avctx->b_quant_factor > 0.0)
776         priv->fixed_qp_b = (int)((priv->fixed_qp_p * avctx->b_quant_factor +
777                                   avctx->b_quant_offset) + 0.5);
778     else
779         priv->fixed_qp_b = priv->fixed_qp_p;
780
781     av_log(avctx, AV_LOG_DEBUG, "Using fixed QP = "
782            "%d / %d / %d for IDR / P / B frames.\n",
783            priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
784     return 0;
785 }
786
787 static av_cold int vaapi_encode_h264_init_internal(AVCodecContext *avctx)
788 {
789     static const VAConfigAttrib default_config_attributes[] = {
790         { .type  = VAConfigAttribRTFormat,
791           .value = VA_RT_FORMAT_YUV420 },
792         { .type  = VAConfigAttribEncPackedHeaders,
793           .value = (VA_ENC_PACKED_HEADER_SEQUENCE |
794                     VA_ENC_PACKED_HEADER_SLICE) },
795     };
796
797     VAAPIEncodeContext      *ctx = avctx->priv_data;
798     VAAPIEncodeH264Context *priv = ctx->priv_data;
799     int i, err;
800
801     switch (avctx->profile) {
802     case FF_PROFILE_H264_CONSTRAINED_BASELINE:
803         ctx->va_profile = VAProfileH264ConstrainedBaseline;
804         break;
805     case FF_PROFILE_H264_BASELINE:
806         ctx->va_profile = VAProfileH264Baseline;
807         break;
808     case FF_PROFILE_H264_MAIN:
809         ctx->va_profile = VAProfileH264Main;
810         break;
811     case FF_PROFILE_H264_EXTENDED:
812         av_log(avctx, AV_LOG_ERROR, "H.264 extended profile "
813                "is not supported.\n");
814         return AVERROR_PATCHWELCOME;
815     case FF_PROFILE_UNKNOWN:
816     case FF_PROFILE_H264_HIGH:
817         ctx->va_profile = VAProfileH264High;
818         break;
819     case FF_PROFILE_H264_HIGH_10:
820     case FF_PROFILE_H264_HIGH_10_INTRA:
821         av_log(avctx, AV_LOG_ERROR, "H.264 10-bit profiles "
822                "are not supported.\n");
823         return AVERROR_PATCHWELCOME;
824     case FF_PROFILE_H264_HIGH_422:
825     case FF_PROFILE_H264_HIGH_422_INTRA:
826     case FF_PROFILE_H264_HIGH_444:
827     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
828     case FF_PROFILE_H264_HIGH_444_INTRA:
829     case FF_PROFILE_H264_CAVLC_444:
830         av_log(avctx, AV_LOG_ERROR, "H.264 non-4:2:0 profiles "
831                "are not supported.\n");
832         return AVERROR_PATCHWELCOME;
833     default:
834         av_log(avctx, AV_LOG_ERROR, "Unknown H.264 profile %d.\n",
835                avctx->profile);
836         return AVERROR(EINVAL);
837     }
838     ctx->va_entrypoint = VAEntrypointEncSlice;
839
840     ctx->input_width    = avctx->width;
841     ctx->input_height   = avctx->height;
842     ctx->aligned_width  = FFALIGN(ctx->input_width,  16);
843     ctx->aligned_height = FFALIGN(ctx->input_height, 16);
844     priv->mb_width      = ctx->aligned_width  / 16;
845     priv->mb_height     = ctx->aligned_height / 16;
846
847     for (i = 0; i < FF_ARRAY_ELEMS(default_config_attributes); i++) {
848         ctx->config_attributes[ctx->nb_config_attributes++] =
849             default_config_attributes[i];
850     }
851
852     if (avctx->bit_rate > 0) {
853         ctx->va_rc_mode = VA_RC_CBR;
854         err = vaapi_encode_h264_init_constant_bitrate(avctx);
855     } else {
856         ctx->va_rc_mode = VA_RC_CQP;
857         err = vaapi_encode_h264_init_fixed_qp(avctx);
858     }
859     if (err < 0)
860         return err;
861
862     ctx->config_attributes[ctx->nb_config_attributes++] = (VAConfigAttrib) {
863         .type  = VAConfigAttribRateControl,
864         .value = ctx->va_rc_mode,
865     };
866
867     ctx->nb_recon_frames = 20;
868
869     return 0;
870 }
871
872 static VAAPIEncodeType vaapi_encode_type_h264 = {
873     .priv_data_size        = sizeof(VAAPIEncodeH264Context),
874
875     .init                  = &vaapi_encode_h264_init_internal,
876
877     .sequence_params_size  = sizeof(VAEncSequenceParameterBufferH264),
878     .init_sequence_params  = &vaapi_encode_h264_init_sequence_params,
879
880     .picture_params_size   = sizeof(VAEncPictureParameterBufferH264),
881     .init_picture_params   = &vaapi_encode_h264_init_picture_params,
882
883     .slice_params_size     = sizeof(VAEncSliceParameterBufferH264),
884     .init_slice_params     = &vaapi_encode_h264_init_slice_params,
885
886     .sequence_header_type  = VAEncPackedHeaderSequence,
887     .write_sequence_header = &vaapi_encode_h264_write_sequence_header,
888
889     .slice_header_type     = VAEncPackedHeaderH264_Slice,
890     .write_slice_header    = &vaapi_encode_h264_write_slice_header,
891 };
892
893 static av_cold int vaapi_encode_h264_init(AVCodecContext *avctx)
894 {
895     return ff_vaapi_encode_init(avctx, &vaapi_encode_type_h264);
896 }
897
898 static const AVCodecDefault vaapi_encode_h264_defaults[] = {
899     { "profile",        "100" },
900     { "level",          "51"  },
901     { "b",              "0"   },
902     { "bf",             "2"   },
903     { "g",              "120" },
904     { "global_quality", "20"  },
905     { "i_qfactor",      "1.0" },
906     { "i_qoffset",      "0.0" },
907     { "b_qfactor",      "1.2" },
908     { "b_qoffset",      "0.0" },
909     { NULL },
910 };
911
912 static const AVClass vaapi_encode_h264_class = {
913     .class_name = "h264_vaapi",
914     .item_name  = av_default_item_name,
915     .version    = LIBAVUTIL_VERSION_INT,
916 };
917
918 AVCodec ff_h264_vaapi_encoder = {
919     .name           = "h264_vaapi",
920     .long_name      = NULL_IF_CONFIG_SMALL("H.264/AVC (VAAPI)"),
921     .type           = AVMEDIA_TYPE_VIDEO,
922     .id             = AV_CODEC_ID_H264,
923     .priv_data_size = sizeof(VAAPIEncodeContext),
924     .init           = &vaapi_encode_h264_init,
925     .encode2        = &ff_vaapi_encode2,
926     .close          = &ff_vaapi_encode_close,
927     .priv_class     = &vaapi_encode_h264_class,
928     .capabilities   = AV_CODEC_CAP_DELAY,
929     .defaults       = vaapi_encode_h264_defaults,
930     .pix_fmts = (const enum AVPixelFormat[]) {
931         AV_PIX_FMT_VAAPI,
932         AV_PIX_FMT_NONE,
933     },
934 };