2 * H.264 HW decode acceleration through VA API
4 * Copyright (C) 2008-2009 Splitted-Desktop Systems
6 * This file is part of FFmpeg.
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.
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.
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
23 #include "vaapi_internal.h"
25 #include "mpegutils.h"
29 * This file implements the glue code between FFmpeg's and VA API's
30 * structures for H.264 decoding.
34 * Initialize an empty VA API picture.
36 * VA API requires a fixed-size reference picture array.
38 static void init_vaapi_pic(VAPictureH264
*va_pic
)
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;
47 * Translate an FFmpeg Picture into its VA API form.
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.
54 static void fill_vaapi_pic(VAPictureH264
*va_pic
,
58 if (pic_structure
== 0)
59 pic_structure
= pic
->reference
;
60 pic_structure
&= PICT_FRAME
; /* PICT_TOP_FIELD|PICT_BOTTOM_FIELD */
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
;
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
;
69 va_pic
->flags
|= pic
->long_ref
? VA_PICTURE_H264_LONG_TERM_REFERENCE
: VA_PICTURE_H264_SHORT_TERM_REFERENCE
;
71 va_pic
->TopFieldOrderCnt
= 0;
72 if (pic
->field_poc
[0] != INT_MAX
)
73 va_pic
->TopFieldOrderCnt
= pic
->field_poc
[0];
75 va_pic
->BottomFieldOrderCnt
= 0;
76 if (pic
->field_poc
[1] != INT_MAX
)
77 va_pic
->BottomFieldOrderCnt
= pic
->field_poc
[1];
80 /** Decoded Picture Buffer (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
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.
93 static int dpb_add(DPB
*dpb
, H264Picture
*pic
)
97 if (dpb
->size
>= dpb
->max_size
)
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);
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
;
112 va_pic
->BottomFieldOrderCnt
= temp_va_pic
.BottomFieldOrderCnt
;
119 fill_vaapi_pic(&dpb
->va_pics
[dpb
->size
++], pic
, 0);
123 /** Fill in VA API reference frames array. */
124 static int fill_vaapi_ReferenceFrames(VAPictureParameterBufferH264
*pic_param
,
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
]);
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)
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)
151 * Fill in VA API reference picture lists from the FFmpeg reference
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
158 static void fill_vaapi_RefPicList(VAPictureH264 RefPicList
[32],
159 H264Picture
*ref_list
,
160 unsigned int ref_count
)
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);
168 init_vaapi_pic(&RefPicList
[n
]);
172 * Fill in prediction weight table.
174 * VA API requires a plain prediction weight table as it does not infer
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
186 static void fill_vaapi_plain_pred_weight_table(H264Context
*h
,
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])
197 *luma_weight_flag
= h
->luma_weight_flag
[list
];
198 *chroma_weight_flag
= h
->chroma_weight_flag
[list
];
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];
207 luma_weight
[i
] = 1 << h
->luma_log2_weight_denom
;
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];
215 chroma_weight
[i
][j
] = 1 << h
->chroma_log2_weight_denom
;
216 chroma_offset
[i
][j
] = 0;
222 /** Initialize and start decoding a frame with VA API. */
223 static int vaapi_h264_start_frame(AVCodecContext
*avctx
,
224 av_unused
const uint8_t *buffer
,
225 av_unused
uint32_t size
)
227 H264Context
* const h
= avctx
->priv_data
;
228 struct vaapi_context
* const vactx
= avctx
->hwaccel_context
;
229 VAPictureParameterBufferH264
*pic_param
;
230 VAIQMatrixBufferH264
*iq_matrix
;
232 av_dlog(avctx
, "vaapi_h264_start_frame()\n");
234 vactx
->slice_param_size
= sizeof(VASliceParameterBufferH264
);
236 /* Fill in VAPictureParameterBufferH264. */
237 pic_param
= ff_vaapi_alloc_pic_param(vactx
, sizeof(VAPictureParameterBufferH264
));
240 fill_vaapi_pic(&pic_param
->CurrPic
, h
->cur_pic_ptr
, h
->picture_structure
);
241 if (fill_vaapi_ReferenceFrames(pic_param
, h
) < 0)
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
;
280 /* Fill in VAIQMatrixBufferH264. */
281 iq_matrix
= ff_vaapi_alloc_iq_matrix(vactx
, sizeof(VAIQMatrixBufferH264
));
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]));
290 /** End a hardware decoding based frame. */
291 static int vaapi_h264_end_frame(AVCodecContext
*avctx
)
293 struct vaapi_context
* const vactx
= avctx
->hwaccel_context
;
294 H264Context
* const h
= avctx
->priv_data
;
297 av_dlog(avctx
, "vaapi_h264_end_frame()\n");
298 ret
= ff_vaapi_commit_slices(vactx
);
302 ret
= ff_vaapi_render_picture(vactx
, ff_vaapi_get_surface_id(&h
->cur_pic_ptr
->f
));
306 ff_h264_draw_horiz_band(h
, 0, h
->avctx
->height
);
309 ff_vaapi_common_end_frame(avctx
);
313 /** Decode the given H.264 slice with VA API. */
314 static int vaapi_h264_decode_slice(AVCodecContext
*avctx
,
315 const uint8_t *buffer
,
318 H264Context
* const h
= avctx
->priv_data
;
319 VASliceParameterBufferH264
*slice_param
;
321 av_dlog(avctx
, "vaapi_h264_decode_slice(): buffer %p, size %d\n",
324 /* Fill in VASliceParameterBufferH264. */
325 slice_param
= (VASliceParameterBufferH264
*)ff_vaapi_alloc_slice(avctx
->hwaccel_context
, buffer
, size
);
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
;
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);
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
);
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_VLD
,
359 .start_frame
= vaapi_h264_start_frame
,
360 .end_frame
= vaapi_h264_end_frame
,
361 .decode_slice
= vaapi_h264_decode_slice
,