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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / vaapi_h264.c
CommitLineData
2ba45a60
DM		 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 FFmpeg.
7 *
8 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 FFmpeg'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 */
38static 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 FFmpeg 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 FFmpeg 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 */
54static 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). */
81typedef 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 */
93static 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. */
124static 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 FFmpeg reference
152 * picture list.
153 *
154 * @param[out] RefPicList VA API internal reference picture list
155 * @param[in] ref_list A pointer to the FFmpeg reference list
156 * @param[in] ref_count The number of reference pictures in ref_list
157 */
158static void fill_vaapi_RefPicList(VAPictureH264 RefPicList[32],
159 H264Picture *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], 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 */
186static 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 unsigned int i, j;
196
197 *luma_weight_flag = h->luma_weight_flag[list];
198 *chroma_weight_flag = h->chroma_weight_flag[list];
199
200 for (i = 0; i < h->ref_count[list]; i++) {
201 /* VA API also wants the inferred (default) values, not
202 only what is available in the bitstream (7.4.3.2). */
203 if (h->luma_weight_flag[list]) {
204 luma_weight[i] = h->luma_weight[i][list][0];
205 luma_offset[i] = h->luma_weight[i][list][1];
206 } else {
207 luma_weight[i] = 1 << h->luma_log2_weight_denom;
208 luma_offset[i] = 0;
209 }
210 for (j = 0; j < 2; j++) {
211 if (h->chroma_weight_flag[list]) {
212 chroma_weight[i][j] = h->chroma_weight[i][list][j][0];
213 chroma_offset[i][j] = h->chroma_weight[i][list][j][1];
214 } else {
215 chroma_weight[i][j] = 1 << h->chroma_log2_weight_denom;
216 chroma_offset[i][j] = 0;
217 }
218 }
219 }
220}
221
222/** Initialize and start decoding a frame with VA API. */
223static int vaapi_h264_start_frame(AVCodecContext *avctx,
224 av_unused const uint8_t *buffer,
225 av_unused uint32_t size)
226{
227 H264Context * const h = avctx->priv_data;
228 struct vaapi_context * const vactx = avctx->hwaccel_context;
229 VAPictureParameterBufferH264 *pic_param;
230 VAIQMatrixBufferH264 *iq_matrix;
231
232 av_dlog(avctx, "vaapi_h264_start_frame()\n");
233
234 vactx->slice_param_size = sizeof(VASliceParameterBufferH264);
235
236 /* Fill in VAPictureParameterBufferH264. */
237 pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferH264));
238 if (!pic_param)
239 return -1;
240 fill_vaapi_pic(&pic_param->CurrPic, h->cur_pic_ptr, h->picture_structure);
241 if (fill_vaapi_ReferenceFrames(pic_param, h) < 0)
242 return -1;
243 pic_param->picture_width_in_mbs_minus1 = h->mb_width - 1;
244 pic_param->picture_height_in_mbs_minus1 = h->mb_height - 1;
245 pic_param->bit_depth_luma_minus8 = h->sps.bit_depth_luma - 8;
246 pic_param->bit_depth_chroma_minus8 = h->sps.bit_depth_chroma - 8;
247 pic_param->num_ref_frames = h->sps.ref_frame_count;
248 pic_param->seq_fields.value = 0; /* reset all bits */
249 pic_param->seq_fields.bits.chroma_format_idc = h->sps.chroma_format_idc;
250 pic_param->seq_fields.bits.residual_colour_transform_flag = h->sps.residual_color_transform_flag; /* XXX: only for 4:4:4 high profile? */
251 pic_param->seq_fields.bits.gaps_in_frame_num_value_allowed_flag = h->sps.gaps_in_frame_num_allowed_flag;
252 pic_param->seq_fields.bits.frame_mbs_only_flag = h->sps.frame_mbs_only_flag;
253 pic_param->seq_fields.bits.mb_adaptive_frame_field_flag = h->sps.mb_aff;
254 pic_param->seq_fields.bits.direct_8x8_inference_flag = h->sps.direct_8x8_inference_flag;
255 pic_param->seq_fields.bits.MinLumaBiPredSize8x8 = h->sps.level_idc >= 31; /* A.3.3.2 */
256 pic_param->seq_fields.bits.log2_max_frame_num_minus4 = h->sps.log2_max_frame_num - 4;
257 pic_param->seq_fields.bits.pic_order_cnt_type = h->sps.poc_type;
258 pic_param->seq_fields.bits.log2_max_pic_order_cnt_lsb_minus4 = h->sps.log2_max_poc_lsb - 4;
259 pic_param->seq_fields.bits.delta_pic_order_always_zero_flag = h->sps.delta_pic_order_always_zero_flag;
260 pic_param->num_slice_groups_minus1 = h->pps.slice_group_count - 1;
261 pic_param->slice_group_map_type = h->pps.mb_slice_group_map_type;
262 pic_param->slice_group_change_rate_minus1 = 0; /* XXX: unimplemented in FFmpeg */
263 pic_param->pic_init_qp_minus26 = h->pps.init_qp - 26;
264 pic_param->pic_init_qs_minus26 = h->pps.init_qs - 26;
265 pic_param->chroma_qp_index_offset = h->pps.chroma_qp_index_offset[0];
266 pic_param->second_chroma_qp_index_offset = h->pps.chroma_qp_index_offset[1];
267 pic_param->pic_fields.value = 0; /* reset all bits */
268 pic_param->pic_fields.bits.entropy_coding_mode_flag = h->pps.cabac;
269 pic_param->pic_fields.bits.weighted_pred_flag = h->pps.weighted_pred;
270 pic_param->pic_fields.bits.weighted_bipred_idc = h->pps.weighted_bipred_idc;
271 pic_param->pic_fields.bits.transform_8x8_mode_flag = h->pps.transform_8x8_mode;
272 pic_param->pic_fields.bits.field_pic_flag = h->picture_structure != PICT_FRAME;
273 pic_param->pic_fields.bits.constrained_intra_pred_flag = h->pps.constrained_intra_pred;
274 pic_param->pic_fields.bits.pic_order_present_flag = h->pps.pic_order_present;
275 pic_param->pic_fields.bits.deblocking_filter_control_present_flag = h->pps.deblocking_filter_parameters_present;
276 pic_param->pic_fields.bits.redundant_pic_cnt_present_flag = h->pps.redundant_pic_cnt_present;
277 pic_param->pic_fields.bits.reference_pic_flag = h->nal_ref_idc != 0;
278 pic_param->frame_num = h->frame_num;
279
280 /* Fill in VAIQMatrixBufferH264. */
281 iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferH264));
282 if (!iq_matrix)
283 return -1;
284 memcpy(iq_matrix->ScalingList4x4, h->pps.scaling_matrix4, sizeof(iq_matrix->ScalingList4x4));
285 memcpy(iq_matrix->ScalingList8x8[0], h->pps.scaling_matrix8[0], sizeof(iq_matrix->ScalingList8x8[0]));
286 memcpy(iq_matrix->ScalingList8x8[1], h->pps.scaling_matrix8[3], sizeof(iq_matrix->ScalingList8x8[0]));
287 return 0;
288}
289
290/** End a hardware decoding based frame. */
291static int vaapi_h264_end_frame(AVCodecContext *avctx)
292{
293 struct vaapi_context * const vactx = avctx->hwaccel_context;
294 H264Context * const h = avctx->priv_data;
295 int ret;
296
297 av_dlog(avctx, "vaapi_h264_end_frame()\n");
298 ret = ff_vaapi_commit_slices(vactx);
299 if (ret < 0)
300 goto finish;
301
302 ret = ff_vaapi_render_picture(vactx, ff_vaapi_get_surface_id(&h->cur_pic_ptr->f));
303 if (ret < 0)
304 goto finish;
305
306 ff_h264_draw_horiz_band(h, 0, h->avctx->height);
307
308finish:
309 ff_vaapi_common_end_frame(avctx);
310 return ret;
311}
312
313/** Decode the given H.264 slice with VA API. */
314static int vaapi_h264_decode_slice(AVCodecContext *avctx,
315 const uint8_t *buffer,
316 uint32_t size)
317{
318 H264Context * const h = avctx->priv_data;
319 VASliceParameterBufferH264 *slice_param;
320
321 av_dlog(avctx, "vaapi_h264_decode_slice(): buffer %p, size %d\n",
322 buffer, size);
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(&h->gb) + 8; /* bit buffer started beyond nal_unit_type */
329 slice_param->first_mb_in_slice = (h->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + h->mb_x;
330 slice_param->slice_type = ff_h264_get_slice_type(h);
331 slice_param->direct_spatial_mv_pred_flag = h->slice_type == AV_PICTURE_TYPE_B ? h->direct_spatial_mv_pred : 0;
332 slice_param->num_ref_idx_l0_active_minus1 = h->list_count > 0 ? h->ref_count[0] - 1 : 0;
333 slice_param->num_ref_idx_l1_active_minus1 = h->list_count > 1 ? h->ref_count[1] - 1 : 0;
334 slice_param->cabac_init_idc = h->cabac_init_idc;
335 slice_param->slice_qp_delta = h->qscale - h->pps.init_qp;
336 slice_param->disable_deblocking_filter_idc = h->deblocking_filter < 2 ? !h->deblocking_filter : h->deblocking_filter;
337 slice_param->slice_alpha_c0_offset_div2 = h->slice_alpha_c0_offset / 2;
338 slice_param->slice_beta_offset_div2 = h->slice_beta_offset / 2;
339 slice_param->luma_log2_weight_denom = h->luma_log2_weight_denom;
340 slice_param->chroma_log2_weight_denom = h->chroma_log2_weight_denom;
341
342 fill_vaapi_RefPicList(slice_param->RefPicList0, h->ref_list[0], h->list_count > 0 ? h->ref_count[0] : 0);
343 fill_vaapi_RefPicList(slice_param->RefPicList1, h->ref_list[1], h->list_count > 1 ? h->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
354AVHWAccel 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_VLD,
359 .start_frame = vaapi_h264_start_frame,
360 .end_frame = vaapi_h264_end_frame,
361 .decode_slice = vaapi_h264_decode_slice,
362};
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