h264: decouple h264_ps from the h264 decoder
[ffmpeg.git] / libavcodec / vaapi_h264.c
1 /*
2  * H.264 HW decode acceleration through VA API
3  *
4  * Copyright (C) 2008-2009 Splitted-Desktop Systems
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #include "vaapi_internal.h"
24 #include "h264.h"
25 #include "mpegutils.h"
26
27 /**
28  * @file
29  * This file implements the glue code between Libav's and VA API's
30  * structures for H.264 decoding.
31  */
32
33 /**
34  * Initialize an empty VA API picture.
35  *
36  * VA API requires a fixed-size reference picture array.
37  */
38 static void init_vaapi_pic(VAPictureH264 *va_pic)
39 {
40     va_pic->picture_id          = VA_INVALID_ID;
41     va_pic->flags               = VA_PICTURE_H264_INVALID;
42     va_pic->TopFieldOrderCnt    = 0;
43     va_pic->BottomFieldOrderCnt = 0;
44 }
45
46 /**
47  * Translate an Libav Picture into its VA API form.
48  *
49  * @param[out] va_pic          A pointer to VA API's own picture struct
50  * @param[in]  pic             A pointer to the Libav picture struct to convert
51  * @param[in]  pic_structure   The picture field type (as defined in mpegvideo.h),
52  *                             supersedes pic's field type if nonzero.
53  */
54 static void fill_vaapi_pic(VAPictureH264 *va_pic,
55                            H264Picture   *pic,
56                            int            pic_structure)
57 {
58     if (pic_structure == 0)
59         pic_structure = pic->reference;
60     pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
61
62     va_pic->picture_id = ff_vaapi_get_surface_id(pic->f);
63     va_pic->frame_idx  = pic->long_ref ? pic->pic_id : pic->frame_num;
64
65     va_pic->flags      = 0;
66     if (pic_structure != PICT_FRAME)
67         va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
68     if (pic->reference)
69         va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
70
71     va_pic->TopFieldOrderCnt = 0;
72     if (pic->field_poc[0] != INT_MAX)
73         va_pic->TopFieldOrderCnt = pic->field_poc[0];
74
75     va_pic->BottomFieldOrderCnt = 0;
76     if (pic->field_poc[1] != INT_MAX)
77         va_pic->BottomFieldOrderCnt = pic->field_poc[1];
78 }
79
80 /** Decoded Picture Buffer (DPB). */
81 typedef struct DPB {
82     int            size;        ///< Current number of reference frames in the DPB
83     int            max_size;    ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
84     VAPictureH264 *va_pics;     ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
85 } DPB;
86
87 /**
88  * Append picture to the decoded picture buffer, in a VA API form that
89  * merges the second field picture attributes with the first, if
90  * available.  The decoded picture buffer's size must be large enough
91  * to receive the new VA API picture object.
92  */
93 static int dpb_add(DPB *dpb, H264Picture *pic)
94 {
95     int i;
96
97     if (dpb->size >= dpb->max_size)
98         return -1;
99
100     for (i = 0; i < dpb->size; i++) {
101         VAPictureH264 * const va_pic = &dpb->va_pics[i];
102         if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) {
103             VAPictureH264 temp_va_pic;
104             fill_vaapi_pic(&temp_va_pic, pic, 0);
105
106             if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
107                 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
108                 /* Merge second field */
109                 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
110                     va_pic->TopFieldOrderCnt    = temp_va_pic.TopFieldOrderCnt;
111                 } else {
112                     va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
113                 }
114             }
115             return 0;
116         }
117     }
118
119     fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
120     return 0;
121 }
122
123 /** Fill in VA API reference frames array. */
124 static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
125                                       H264Context                  *h)
126 {
127     DPB dpb;
128     int i;
129
130     dpb.size     = 0;
131     dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
132     dpb.va_pics  = pic_param->ReferenceFrames;
133     for (i = 0; i < dpb.max_size; i++)
134         init_vaapi_pic(&dpb.va_pics[i]);
135
136     for (i = 0; i < h->short_ref_count; i++) {
137         H264Picture * const pic = h->short_ref[i];
138         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
139             return -1;
140     }
141
142     for (i = 0; i < 16; i++) {
143         H264Picture * const pic = h->long_ref[i];
144         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
145             return -1;
146     }
147     return 0;
148 }
149
150 /**
151  * Fill in VA API reference picture lists from the Libav reference
152  * picture list.
153  *
154  * @param[out] RefPicList  VA API internal reference picture list
155  * @param[in]  ref_list    A pointer to the Libav reference list
156  * @param[in]  ref_count   The number of reference pictures in ref_list
157  */
158 static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
159                                   H264Ref  *ref_list,
160                                   unsigned int  ref_count)
161 {
162     unsigned int i, n = 0;
163     for (i = 0; i < ref_count; i++)
164         if (ref_list[i].reference)
165             fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent, 0);
166
167     for (; n < 32; n++)
168         init_vaapi_pic(&RefPicList[n]);
169 }
170
171 /**
172  * Fill in prediction weight table.
173  *
174  * VA API requires a plain prediction weight table as it does not infer
175  * any value.
176  *
177  * @param[in]  h                   A pointer to the current H.264 context
178  * @param[in]  list                The reference frame list index to use
179  * @param[out] luma_weight_flag    VA API plain luma weight flag
180  * @param[out] luma_weight         VA API plain luma weight table
181  * @param[out] luma_offset         VA API plain luma offset table
182  * @param[out] chroma_weight_flag  VA API plain chroma weight flag
183  * @param[out] chroma_weight       VA API plain chroma weight table
184  * @param[out] chroma_offset       VA API plain chroma offset table
185  */
186 static void fill_vaapi_plain_pred_weight_table(H264Context   *h,
187                                                int            list,
188                                                unsigned char *luma_weight_flag,
189                                                short          luma_weight[32],
190                                                short          luma_offset[32],
191                                                unsigned char *chroma_weight_flag,
192                                                short          chroma_weight[32][2],
193                                                short          chroma_offset[32][2])
194 {
195     H264SliceContext *sl = &h->slice_ctx[0];
196     unsigned int i, j;
197
198     *luma_weight_flag    = sl->pwt.luma_weight_flag[list];
199     *chroma_weight_flag  = sl->pwt.chroma_weight_flag[list];
200
201     for (i = 0; i < sl->ref_count[list]; i++) {
202         /* VA API also wants the inferred (default) values, not
203            only what is available in the bitstream (7.4.3.2). */
204         if (sl->pwt.luma_weight_flag[list]) {
205             luma_weight[i] = sl->pwt.luma_weight[i][list][0];
206             luma_offset[i] = sl->pwt.luma_weight[i][list][1];
207         } else {
208             luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
209             luma_offset[i] = 0;
210         }
211         for (j = 0; j < 2; j++) {
212             if (sl->pwt.chroma_weight_flag[list]) {
213                 chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
214                 chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
215             } else {
216                 chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
217                 chroma_offset[i][j] = 0;
218             }
219         }
220     }
221 }
222
223 /** Initialize and start decoding a frame with VA API. */
224 static int vaapi_h264_start_frame(AVCodecContext          *avctx,
225                                   av_unused const uint8_t *buffer,
226                                   av_unused uint32_t       size)
227 {
228     H264Context * const h = avctx->priv_data;
229     struct vaapi_context * const vactx = avctx->hwaccel_context;
230     const PPS *pps = h->ps.pps;
231     const SPS *sps = h->ps.sps;
232     VAPictureParameterBufferH264 *pic_param;
233     VAIQMatrixBufferH264 *iq_matrix;
234
235     ff_dlog(avctx, "vaapi_h264_start_frame()\n");
236
237     vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
238
239     /* Fill in VAPictureParameterBufferH264. */
240     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
241     if (!pic_param)
242         return -1;
243     fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure);
244     if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
245         return -1;
246     pic_param->picture_width_in_mbs_minus1                      = h->mb_width - 1;
247     pic_param->picture_height_in_mbs_minus1                     = h->mb_height - 1;
248     pic_param->bit_depth_luma_minus8                            = sps->bit_depth_luma - 8;
249     pic_param->bit_depth_chroma_minus8                          = sps->bit_depth_chroma - 8;
250     pic_param->num_ref_frames                                   = sps->ref_frame_count;
251     pic_param->seq_fields.value                                 = 0; /* reset all bits */
252     pic_param->seq_fields.bits.chroma_format_idc                = sps->chroma_format_idc;
253     pic_param->seq_fields.bits.residual_colour_transform_flag   = sps->residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
254     pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag;
255     pic_param->seq_fields.bits.frame_mbs_only_flag              = sps->frame_mbs_only_flag;
256     pic_param->seq_fields.bits.mb_adaptive_frame_field_flag     = sps->mb_aff;
257     pic_param->seq_fields.bits.direct_8x8_inference_flag        = sps->direct_8x8_inference_flag;
258     pic_param->seq_fields.bits.MinLumaBiPredSize8x8             = sps->level_idc >= 31; /* A.3.3.2 */
259     pic_param->seq_fields.bits.log2_max_frame_num_minus4        = sps->log2_max_frame_num - 4;
260     pic_param->seq_fields.bits.pic_order_cnt_type               = sps->poc_type;
261     pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
262     pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
263     pic_param->num_slice_groups_minus1                          = pps->slice_group_count - 1;
264     pic_param->slice_group_map_type                             = pps->mb_slice_group_map_type;
265     pic_param->slice_group_change_rate_minus1                   = 0; /* XXX: unimplemented in Libav */
266     pic_param->pic_init_qp_minus26                              = pps->init_qp - 26;
267     pic_param->pic_init_qs_minus26                              = pps->init_qs - 26;
268     pic_param->chroma_qp_index_offset                           = pps->chroma_qp_index_offset[0];
269     pic_param->second_chroma_qp_index_offset                    = pps->chroma_qp_index_offset[1];
270     pic_param->pic_fields.value                                 = 0; /* reset all bits */
271     pic_param->pic_fields.bits.entropy_coding_mode_flag         = pps->cabac;
272     pic_param->pic_fields.bits.weighted_pred_flag               = pps->weighted_pred;
273     pic_param->pic_fields.bits.weighted_bipred_idc              = pps->weighted_bipred_idc;
274     pic_param->pic_fields.bits.transform_8x8_mode_flag          = pps->transform_8x8_mode;
275     pic_param->pic_fields.bits.field_pic_flag                   = h->picture_structure != PICT_FRAME;
276     pic_param->pic_fields.bits.constrained_intra_pred_flag      = pps->constrained_intra_pred;
277     pic_param->pic_fields.bits.pic_order_present_flag           = pps->pic_order_present;
278     pic_param->pic_fields.bits.deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
279     pic_param->pic_fields.bits.redundant_pic_cnt_present_flag   = pps->redundant_pic_cnt_present;
280     pic_param->pic_fields.bits.reference_pic_flag               = h->nal_ref_idc != 0;
281     pic_param->frame_num                                        = h->frame_num;
282
283     /* Fill in VAIQMatrixBufferH264. */
284     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
285     if (!iq_matrix)
286         return -1;
287     memcpy(iq_matrix->ScalingList4x4, pps->scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
288     memcpy(iq_matrix->ScalingList8x8[0], pps->scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0]));
289     memcpy(iq_matrix->ScalingList8x8[1], pps->scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0]));
290     return 0;
291 }
292
293 /** End a hardware decoding based frame. */
294 static int vaapi_h264_end_frame(AVCodecContext *avctx)
295 {
296     struct vaapi_context * const vactx = avctx->hwaccel_context;
297     H264Context * const h = avctx->priv_data;
298     H264SliceContext *sl = &h->slice_ctx[0];
299     int ret;
300
301     ff_dlog(avctx, "vaapi_h264_end_frame()\n");
302     ret = ff_vaapi_commit_slices(vactx);
303     if (ret < 0)
304         goto finish;
305
306     ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->cur_pic_ptr->f));
307     if (ret < 0)
308         goto finish;
309
310     ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
311
312 finish:
313     ff_vaapi_common_end_frame(avctx);
314     return ret;
315 }
316
317 /** Decode the given H.264 slice with VA API. */
318 static int vaapi_h264_decode_slice(AVCodecContext *avctx,
319                                    const uint8_t  *buffer,
320                                    uint32_t        size)
321 {
322     H264Context * const h = avctx->priv_data;
323     H264SliceContext *sl  = &h->slice_ctx[0];
324     VASliceParameterBufferH264 *slice_param;
325
326     ff_dlog(avctx, "vaapi_h264_decode_slice(): buffer %p, size %d\n",
327             buffer, size);
328
329     /* Fill in VASliceParameterBufferH264. */
330     slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
331     if (!slice_param)
332         return -1;
333     slice_param->slice_data_bit_offset          = get_bits_count(&sl->gb);
334     slice_param->first_mb_in_slice              = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
335     slice_param->slice_type                     = ff_h264_get_slice_type(sl);
336     slice_param->direct_spatial_mv_pred_flag    = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0;
337     slice_param->num_ref_idx_l0_active_minus1   = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0;
338     slice_param->num_ref_idx_l1_active_minus1   = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0;
339     slice_param->cabac_init_idc                 = sl->cabac_init_idc;
340     slice_param->slice_qp_delta                 = sl->qscale - h->ps.pps->init_qp;
341     slice_param->disable_deblocking_filter_idc  = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter;
342     slice_param->slice_alpha_c0_offset_div2     = sl->slice_alpha_c0_offset / 2;
343     slice_param->slice_beta_offset_div2         = sl->slice_beta_offset     / 2;
344     slice_param->luma_log2_weight_denom         = sl->pwt.luma_log2_weight_denom;
345     slice_param->chroma_log2_weight_denom       = sl->pwt.chroma_log2_weight_denom;
346
347     fill_vaapi_RefPicList(slice_param->RefPicList0, sl->ref_list[0], sl->list_count > 0 ? sl->ref_count[0] : 0);
348     fill_vaapi_RefPicList(slice_param->RefPicList1, sl->ref_list[1], sl->list_count > 1 ? sl->ref_count[1] : 0);
349
350     fill_vaapi_plain_pred_weight_table(h, 0,
351                                        &slice_param->luma_weight_l0_flag,   slice_param->luma_weight_l0,   slice_param->luma_offset_l0,
352                                        &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0);
353     fill_vaapi_plain_pred_weight_table(h, 1,
354                                        &slice_param->luma_weight_l1_flag,   slice_param->luma_weight_l1,   slice_param->luma_offset_l1,
355                                        &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1);
356     return 0;
357 }
358
359 AVHWAccel ff_h264_vaapi_hwaccel = {
360     .name           = "h264_vaapi",
361     .type           = AVMEDIA_TYPE_VIDEO,
362     .id             = AV_CODEC_ID_H264,
363     .pix_fmt        = AV_PIX_FMT_VAAPI,
364     .start_frame    = vaapi_h264_start_frame,
365     .end_frame      = vaapi_h264_end_frame,
366     .decode_slice   = vaapi_h264_decode_slice,
367 };