h264: move the parameter set definitions to a new header file
[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 "h264dec.h"
25 #include "h264_ps.h"
26 #include "mpegutils.h"
27
28 /**
29  * @file
30  * This file implements the glue code between Libav's and VA API's
31  * structures for H.264 decoding.
32  */
33
34 /**
35  * Initialize an empty VA API picture.
36  *
37  * VA API requires a fixed-size reference picture array.
38  */
39 static void init_vaapi_pic(VAPictureH264 *va_pic)
40 {
41     va_pic->picture_id          = VA_INVALID_ID;
42     va_pic->flags               = VA_PICTURE_H264_INVALID;
43     va_pic->TopFieldOrderCnt    = 0;
44     va_pic->BottomFieldOrderCnt = 0;
45 }
46
47 /**
48  * Translate an Libav Picture into its VA API form.
49  *
50  * @param[out] va_pic          A pointer to VA API's own picture struct
51  * @param[in]  pic             A pointer to the Libav picture struct to convert
52  * @param[in]  pic_structure   The picture field type (as defined in mpegvideo.h),
53  *                             supersedes pic's field type if nonzero.
54  */
55 static void fill_vaapi_pic(VAPictureH264 *va_pic,
56                            H264Picture   *pic,
57                            int            pic_structure)
58 {
59     if (pic_structure == 0)
60         pic_structure = pic->reference;
61     pic_structure &= PICT_FRAME; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
62
63     va_pic->picture_id = ff_vaapi_get_surface_id(pic->f);
64     va_pic->frame_idx  = pic->long_ref ? pic->pic_id : pic->frame_num;
65
66     va_pic->flags      = 0;
67     if (pic_structure != PICT_FRAME)
68         va_pic->flags |= (pic_structure & PICT_TOP_FIELD) ? VA_PICTURE_H264_TOP_FIELD : VA_PICTURE_H264_BOTTOM_FIELD;
69     if (pic->reference)
70         va_pic->flags |= pic->long_ref ? VA_PICTURE_H264_LONG_TERM_REFERENCE : VA_PICTURE_H264_SHORT_TERM_REFERENCE;
71
72     va_pic->TopFieldOrderCnt = 0;
73     if (pic->field_poc[0] != INT_MAX)
74         va_pic->TopFieldOrderCnt = pic->field_poc[0];
75
76     va_pic->BottomFieldOrderCnt = 0;
77     if (pic->field_poc[1] != INT_MAX)
78         va_pic->BottomFieldOrderCnt = pic->field_poc[1];
79 }
80
81 /** Decoded Picture Buffer (DPB). */
82 typedef struct DPB {
83     int            size;        ///< Current number of reference frames in the DPB
84     int            max_size;    ///< Max number of reference frames. This is FF_ARRAY_ELEMS(VAPictureParameterBufferH264.ReferenceFrames)
85     VAPictureH264 *va_pics;     ///< Pointer to VAPictureParameterBufferH264.ReferenceFrames array
86 } DPB;
87
88 /**
89  * Append picture to the decoded picture buffer, in a VA API form that
90  * merges the second field picture attributes with the first, if
91  * available.  The decoded picture buffer's size must be large enough
92  * to receive the new VA API picture object.
93  */
94 static int dpb_add(DPB *dpb, H264Picture *pic)
95 {
96     int i;
97
98     if (dpb->size >= dpb->max_size)
99         return -1;
100
101     for (i = 0; i < dpb->size; i++) {
102         VAPictureH264 * const va_pic = &dpb->va_pics[i];
103         if (va_pic->picture_id == ff_vaapi_get_surface_id(pic->f)) {
104             VAPictureH264 temp_va_pic;
105             fill_vaapi_pic(&temp_va_pic, pic, 0);
106
107             if ((temp_va_pic.flags ^ va_pic->flags) & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD)) {
108                 va_pic->flags |= temp_va_pic.flags & (VA_PICTURE_H264_TOP_FIELD | VA_PICTURE_H264_BOTTOM_FIELD);
109                 /* Merge second field */
110                 if (temp_va_pic.flags & VA_PICTURE_H264_TOP_FIELD) {
111                     va_pic->TopFieldOrderCnt    = temp_va_pic.TopFieldOrderCnt;
112                 } else {
113                     va_pic->BottomFieldOrderCnt = temp_va_pic.BottomFieldOrderCnt;
114                 }
115             }
116             return 0;
117         }
118     }
119
120     fill_vaapi_pic(&dpb->va_pics[dpb->size++], pic, 0);
121     return 0;
122 }
123
124 /** Fill in VA API reference frames array. */
125 static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264 *pic_param,
126                                       H264Context                  *h)
127 {
128     DPB dpb;
129     int i;
130
131     dpb.size     = 0;
132     dpb.max_size = FF_ARRAY_ELEMS(pic_param->ReferenceFrames);
133     dpb.va_pics  = pic_param->ReferenceFrames;
134     for (i = 0; i < dpb.max_size; i++)
135         init_vaapi_pic(&dpb.va_pics[i]);
136
137     for (i = 0; i < h->short_ref_count; i++) {
138         H264Picture * const pic = h->short_ref[i];
139         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
140             return -1;
141     }
142
143     for (i = 0; i < 16; i++) {
144         H264Picture * const pic = h->long_ref[i];
145         if (pic && pic->reference && dpb_add(&dpb, pic) < 0)
146             return -1;
147     }
148     return 0;
149 }
150
151 /**
152  * Fill in VA API reference picture lists from the Libav reference
153  * picture list.
154  *
155  * @param[out] RefPicList  VA API internal reference picture list
156  * @param[in]  ref_list    A pointer to the Libav reference list
157  * @param[in]  ref_count   The number of reference pictures in ref_list
158  */
159 static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
160                                   H264Ref  *ref_list,
161                                   unsigned int  ref_count)
162 {
163     unsigned int i, n = 0;
164     for (i = 0; i < ref_count; i++)
165         if (ref_list[i].reference)
166             fill_vaapi_pic(&RefPicList[n++], ref_list[i].parent, 0);
167
168     for (; n < 32; n++)
169         init_vaapi_pic(&RefPicList[n]);
170 }
171
172 /**
173  * Fill in prediction weight table.
174  *
175  * VA API requires a plain prediction weight table as it does not infer
176  * any value.
177  *
178  * @param[in]  h                   A pointer to the current H.264 context
179  * @param[in]  list                The reference frame list index to use
180  * @param[out] luma_weight_flag    VA API plain luma weight flag
181  * @param[out] luma_weight         VA API plain luma weight table
182  * @param[out] luma_offset         VA API plain luma offset table
183  * @param[out] chroma_weight_flag  VA API plain chroma weight flag
184  * @param[out] chroma_weight       VA API plain chroma weight table
185  * @param[out] chroma_offset       VA API plain chroma offset table
186  */
187 static void fill_vaapi_plain_pred_weight_table(H264Context   *h,
188                                                int            list,
189                                                unsigned char *luma_weight_flag,
190                                                short          luma_weight[32],
191                                                short          luma_offset[32],
192                                                unsigned char *chroma_weight_flag,
193                                                short          chroma_weight[32][2],
194                                                short          chroma_offset[32][2])
195 {
196     H264SliceContext *sl = &h->slice_ctx[0];
197     unsigned int i, j;
198
199     *luma_weight_flag    = sl->pwt.luma_weight_flag[list];
200     *chroma_weight_flag  = sl->pwt.chroma_weight_flag[list];
201
202     for (i = 0; i < sl->ref_count[list]; i++) {
203         /* VA API also wants the inferred (default) values, not
204            only what is available in the bitstream (7.4.3.2). */
205         if (sl->pwt.luma_weight_flag[list]) {
206             luma_weight[i] = sl->pwt.luma_weight[i][list][0];
207             luma_offset[i] = sl->pwt.luma_weight[i][list][1];
208         } else {
209             luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
210             luma_offset[i] = 0;
211         }
212         for (j = 0; j < 2; j++) {
213             if (sl->pwt.chroma_weight_flag[list]) {
214                 chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
215                 chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
216             } else {
217                 chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
218                 chroma_offset[i][j] = 0;
219             }
220         }
221     }
222 }
223
224 /** Initialize and start decoding a frame with VA API. */
225 static int vaapi_h264_start_frame(AVCodecContext          *avctx,
226                                   av_unused const uint8_t *buffer,
227                                   av_unused uint32_t       size)
228 {
229     H264Context * const h = avctx->priv_data;
230     struct vaapi_context * const vactx = avctx->hwaccel_context;
231     const PPS *pps = h->ps.pps;
232     const SPS *sps = h->ps.sps;
233     VAPictureParameterBufferH264 *pic_param;
234     VAIQMatrixBufferH264 *iq_matrix;
235
236     vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
237
238     /* Fill in VAPictureParameterBufferH264. */
239     pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
240     if (!pic_param)
241         return -1;
242     fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure);
243     if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
244         return -1;
245     pic_param->picture_width_in_mbs_minus1                      = h->mb_width - 1;
246     pic_param->picture_height_in_mbs_minus1                     = h->mb_height - 1;
247     pic_param->bit_depth_luma_minus8                            = sps->bit_depth_luma - 8;
248     pic_param->bit_depth_chroma_minus8                          = sps->bit_depth_chroma - 8;
249     pic_param->num_ref_frames                                   = sps->ref_frame_count;
250     pic_param->seq_fields.value                                 = 0; /* reset all bits */
251     pic_param->seq_fields.bits.chroma_format_idc                = sps->chroma_format_idc;
252     pic_param->seq_fields.bits.residual_colour_transform_flag   = sps->residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
253     pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = sps->gaps_in_frame_num_allowed_flag;
254     pic_param->seq_fields.bits.frame_mbs_only_flag              = sps->frame_mbs_only_flag;
255     pic_param->seq_fields.bits.mb_adaptive_frame_field_flag     = sps->mb_aff;
256     pic_param->seq_fields.bits.direct_8x8_inference_flag        = sps->direct_8x8_inference_flag;
257     pic_param->seq_fields.bits.MinLumaBiPredSize8x8             = sps->level_idc >= 31; /* A.3.3.2 */
258     pic_param->seq_fields.bits.log2_max_frame_num_minus4        = sps->log2_max_frame_num - 4;
259     pic_param->seq_fields.bits.pic_order_cnt_type               = sps->poc_type;
260     pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4;
261     pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = sps->delta_pic_order_always_zero_flag;
262     pic_param->num_slice_groups_minus1                          = pps->slice_group_count - 1;
263     pic_param->slice_group_map_type                             = pps->mb_slice_group_map_type;
264     pic_param->slice_group_change_rate_minus1                   = 0; /* XXX: unimplemented in Libav */
265     pic_param->pic_init_qp_minus26                              = pps->init_qp - 26;
266     pic_param->pic_init_qs_minus26                              = pps->init_qs - 26;
267     pic_param->chroma_qp_index_offset                           = pps->chroma_qp_index_offset[0];
268     pic_param->second_chroma_qp_index_offset                    = pps->chroma_qp_index_offset[1];
269     pic_param->pic_fields.value                                 = 0; /* reset all bits */
270     pic_param->pic_fields.bits.entropy_coding_mode_flag         = pps->cabac;
271     pic_param->pic_fields.bits.weighted_pred_flag               = pps->weighted_pred;
272     pic_param->pic_fields.bits.weighted_bipred_idc              = pps->weighted_bipred_idc;
273     pic_param->pic_fields.bits.transform_8x8_mode_flag          = pps->transform_8x8_mode;
274     pic_param->pic_fields.bits.field_pic_flag                   = h->picture_structure != PICT_FRAME;
275     pic_param->pic_fields.bits.constrained_intra_pred_flag      = pps->constrained_intra_pred;
276     pic_param->pic_fields.bits.pic_order_present_flag           = pps->pic_order_present;
277     pic_param->pic_fields.bits.deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present;
278     pic_param->pic_fields.bits.redundant_pic_cnt_present_flag   = pps->redundant_pic_cnt_present;
279     pic_param->pic_fields.bits.reference_pic_flag               = h->nal_ref_idc != 0;
280     pic_param->frame_num                                        = h->poc.frame_num;
281
282     /* Fill in VAIQMatrixBufferH264. */
283     iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
284     if (!iq_matrix)
285         return -1;
286     memcpy(iq_matrix->ScalingList4x4, pps->scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
287     memcpy(iq_matrix->ScalingList8x8[0], pps->scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0]));
288     memcpy(iq_matrix->ScalingList8x8[1], pps->scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0]));
289     return 0;
290 }
291
292 /** End a hardware decoding based frame. */
293 static int vaapi_h264_end_frame(AVCodecContext *avctx)
294 {
295     struct vaapi_context * const vactx = avctx->hwaccel_context;
296     H264Context * const h = avctx->priv_data;
297     H264SliceContext *sl = &h->slice_ctx[0];
298     int ret;
299
300     ret = ff_vaapi_commit_slices(vactx);
301     if (ret < 0)
302         goto finish;
303
304     ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(h->cur_pic_ptr->f));
305     if (ret < 0)
306         goto finish;
307
308     ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
309
310 finish:
311     ff_vaapi_common_end_frame(avctx);
312     return ret;
313 }
314
315 /** Decode the given H.264 slice with VA API. */
316 static int vaapi_h264_decode_slice(AVCodecContext *avctx,
317                                    const uint8_t  *buffer,
318                                    uint32_t        size)
319 {
320     H264Context * const h = avctx->priv_data;
321     H264SliceContext *sl  = &h->slice_ctx[0];
322     VASliceParameterBufferH264 *slice_param;
323
324     /* Fill in VASliceParameterBufferH264. */
325     slice_param = (VASliceParameterBufferH264 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
326     if (!slice_param)
327         return -1;
328     slice_param->slice_data_bit_offset          = get_bits_count(&sl->gb);
329     slice_param->first_mb_in_slice              = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x;
330     slice_param->slice_type                     = ff_h264_get_slice_type(sl);
331     slice_param->direct_spatial_mv_pred_flag    = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0;
332     slice_param->num_ref_idx_l0_active_minus1   = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0;
333     slice_param->num_ref_idx_l1_active_minus1   = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0;
334     slice_param->cabac_init_idc                 = sl->cabac_init_idc;
335     slice_param->slice_qp_delta                 = sl->qscale - h->ps.pps->init_qp;
336     slice_param->disable_deblocking_filter_idc  = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter;
337     slice_param->slice_alpha_c0_offset_div2     = sl->slice_alpha_c0_offset / 2;
338     slice_param->slice_beta_offset_div2         = sl->slice_beta_offset     / 2;
339     slice_param->luma_log2_weight_denom         = sl->pwt.luma_log2_weight_denom;
340     slice_param->chroma_log2_weight_denom       = sl->pwt.chroma_log2_weight_denom;
341
342     fill_vaapi_RefPicList(slice_param->RefPicList0, sl->ref_list[0], sl->list_count > 0 ? sl->ref_count[0] : 0);
343     fill_vaapi_RefPicList(slice_param->RefPicList1, sl->ref_list[1], sl->list_count > 1 ? sl->ref_count[1] : 0);
344
345     fill_vaapi_plain_pred_weight_table(h, 0,
346                                        &slice_param->luma_weight_l0_flag,   slice_param->luma_weight_l0,   slice_param->luma_offset_l0,
347                                        &slice_param->chroma_weight_l0_flag, slice_param->chroma_weight_l0, slice_param->chroma_offset_l0);
348     fill_vaapi_plain_pred_weight_table(h, 1,
349                                        &slice_param->luma_weight_l1_flag,   slice_param->luma_weight_l1,   slice_param->luma_offset_l1,
350                                        &slice_param->chroma_weight_l1_flag, slice_param->chroma_weight_l1, slice_param->chroma_offset_l1);
351     return 0;
352 }
353
354 AVHWAccel ff_h264_vaapi_hwaccel = {
355     .name           = "h264_vaapi",
356     .type           = AVMEDIA_TYPE_VIDEO,
357     .id             = AV_CODEC_ID_H264,
358     .pix_fmt        = AV_PIX_FMT_VAAPI,
359     .start_frame    = vaapi_h264_start_frame,
360     .end_frame      = vaapi_h264_end_frame,
361     .decode_slice   = vaapi_h264_decode_slice,
362 };