GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vaapi_h264.c Lines: 0 173 0.0 %
Date: 2020-10-23 17:01:47 Branches: 0 84 0.0 %

Line Branch Exec Source
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 "h264dec.h"
24
#include "h264_ps.h"
25
#include "hwconfig.h"
26
#include "vaapi_decode.h"
27
28
/**
29
 * @file
30
 * This file implements the glue code between FFmpeg'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 FFmpeg 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 FFmpeg 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
                           const 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, const 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
                                      const 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
        const H264Picture *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
        const H264Picture *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 FFmpeg reference
153
 * picture list.
154
 *
155
 * @param[out] RefPicList  VA API internal reference picture list
156
 * @param[in]  ref_list    A pointer to the FFmpeg 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
                                  const 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,
167
                           ref_list[i].reference);
168
169
    for (; n < 32; n++)
170
        init_vaapi_pic(&RefPicList[n]);
171
}
172
173
/**
174
 * Fill in prediction weight table.
175
 *
176
 * VA API requires a plain prediction weight table as it does not infer
177
 * any value.
178
 *
179
 * @param[in]  h                   A pointer to the current H.264 context
180
 * @param[in]  list                The reference frame list index to use
181
 * @param[out] luma_weight_flag    VA API plain luma weight flag
182
 * @param[out] luma_weight         VA API plain luma weight table
183
 * @param[out] luma_offset         VA API plain luma offset table
184
 * @param[out] chroma_weight_flag  VA API plain chroma weight flag
185
 * @param[out] chroma_weight       VA API plain chroma weight table
186
 * @param[out] chroma_offset       VA API plain chroma offset table
187
 */
188
static void fill_vaapi_plain_pred_weight_table(const H264Context *h,
189
                                               int            list,
190
                                               unsigned char *luma_weight_flag,
191
                                               short          luma_weight[32],
192
                                               short          luma_offset[32],
193
                                               unsigned char *chroma_weight_flag,
194
                                               short          chroma_weight[32][2],
195
                                               short          chroma_offset[32][2])
196
{
197
    const H264SliceContext *sl = &h->slice_ctx[0];
198
    unsigned int i, j;
199
200
    *luma_weight_flag    = sl->pwt.luma_weight_flag[list];
201
    *chroma_weight_flag  = sl->pwt.chroma_weight_flag[list];
202
203
    for (i = 0; i < sl->ref_count[list]; i++) {
204
        /* VA API also wants the inferred (default) values, not
205
           only what is available in the bitstream (7.4.3.2). */
206
        if (sl->pwt.luma_weight_flag[list]) {
207
            luma_weight[i] = sl->pwt.luma_weight[i][list][0];
208
            luma_offset[i] = sl->pwt.luma_weight[i][list][1];
209
        } else {
210
            luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
211
            luma_offset[i] = 0;
212
        }
213
        for (j = 0; j < 2; j++) {
214
            if (sl->pwt.chroma_weight_flag[list]) {
215
                chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
216
                chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
217
            } else {
218
                chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
219
                chroma_offset[i][j] = 0;
220
            }
221
        }
222
    }
223
}
224
225
/** Initialize and start decoding a frame with VA API. */
226
static int vaapi_h264_start_frame(AVCodecContext          *avctx,
227
                                  av_unused const uint8_t *buffer,
228
                                  av_unused uint32_t       size)
229
{
230
    const H264Context *h = avctx->priv_data;
231
    VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
232
    const PPS *pps = h->ps.pps;
233
    const SPS *sps = h->ps.sps;
234
    VAPictureParameterBufferH264 pic_param;
235
    VAIQMatrixBufferH264 iq_matrix;
236
    int err;
237
238
    pic->output_surface = ff_vaapi_get_surface_id(h->cur_pic_ptr->f);
239
240
    pic_param = (VAPictureParameterBufferH264) {
241
        .picture_width_in_mbs_minus1                = h->mb_width - 1,
242
        .picture_height_in_mbs_minus1               = h->mb_height - 1,
243
        .bit_depth_luma_minus8                      = sps->bit_depth_luma - 8,
244
        .bit_depth_chroma_minus8                    = sps->bit_depth_chroma - 8,
245
        .num_ref_frames                             = sps->ref_frame_count,
246
        .seq_fields.bits = {
247
            .chroma_format_idc                      = sps->chroma_format_idc,
248
            .residual_colour_transform_flag         = sps->residual_color_transform_flag,
249
            .gaps_in_frame_num_value_allowed_flag   = sps->gaps_in_frame_num_allowed_flag,
250
            .frame_mbs_only_flag                    = sps->frame_mbs_only_flag,
251
            .mb_adaptive_frame_field_flag           = sps->mb_aff,
252
            .direct_8x8_inference_flag              = sps->direct_8x8_inference_flag,
253
            .MinLumaBiPredSize8x8                   = sps->level_idc >= 31, /* A.3.3.2 */
254
            .log2_max_frame_num_minus4              = sps->log2_max_frame_num - 4,
255
            .pic_order_cnt_type                     = sps->poc_type,
256
            .log2_max_pic_order_cnt_lsb_minus4      = sps->log2_max_poc_lsb - 4,
257
            .delta_pic_order_always_zero_flag       = sps->delta_pic_order_always_zero_flag,
258
        },
259
        .pic_init_qp_minus26                        = pps->init_qp - 26,
260
        .pic_init_qs_minus26                        = pps->init_qs - 26,
261
        .chroma_qp_index_offset                     = pps->chroma_qp_index_offset[0],
262
        .second_chroma_qp_index_offset              = pps->chroma_qp_index_offset[1],
263
        .pic_fields.bits = {
264
            .entropy_coding_mode_flag               = pps->cabac,
265
            .weighted_pred_flag                     = pps->weighted_pred,
266
            .weighted_bipred_idc                    = pps->weighted_bipred_idc,
267
            .transform_8x8_mode_flag                = pps->transform_8x8_mode,
268
            .field_pic_flag                         = h->picture_structure != PICT_FRAME,
269
            .constrained_intra_pred_flag            = pps->constrained_intra_pred,
270
            .pic_order_present_flag                 = pps->pic_order_present,
271
            .deblocking_filter_control_present_flag = pps->deblocking_filter_parameters_present,
272
            .redundant_pic_cnt_present_flag         = pps->redundant_pic_cnt_present,
273
            .reference_pic_flag                     = h->nal_ref_idc != 0,
274
        },
275
        .frame_num                                  = h->poc.frame_num,
276
    };
277
278
    fill_vaapi_pic(&pic_param.CurrPic, h->cur_pic_ptr, h->picture_structure);
279
    err = fill_vaapi_ReferenceFrames(&pic_param, h);
280
    if (err < 0)
281
        goto fail;
282
283
    err = ff_vaapi_decode_make_param_buffer(avctx, pic,
284
                                            VAPictureParameterBufferType,
285
                                            &pic_param, sizeof(pic_param));
286
    if (err < 0)
287
        goto fail;
288
289
    memcpy(iq_matrix.ScalingList4x4,
290
           pps->scaling_matrix4, sizeof(iq_matrix.ScalingList4x4));
291
    memcpy(iq_matrix.ScalingList8x8[0],
292
           pps->scaling_matrix8[0], sizeof(iq_matrix.ScalingList8x8[0]));
293
    memcpy(iq_matrix.ScalingList8x8[1],
294
           pps->scaling_matrix8[3], sizeof(iq_matrix.ScalingList8x8[0]));
295
296
    err = ff_vaapi_decode_make_param_buffer(avctx, pic,
297
                                            VAIQMatrixBufferType,
298
                                            &iq_matrix, sizeof(iq_matrix));
299
    if (err < 0)
300
        goto fail;
301
302
    return 0;
303
304
fail:
305
    ff_vaapi_decode_cancel(avctx, pic);
306
    return err;
307
}
308
309
/** End a hardware decoding based frame. */
310
static int vaapi_h264_end_frame(AVCodecContext *avctx)
311
{
312
    const H264Context *h = avctx->priv_data;
313
    VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
314
    H264SliceContext *sl = &h->slice_ctx[0];
315
    int ret;
316
317
    ret = ff_vaapi_decode_issue(avctx, pic);
318
    if (ret < 0)
319
        goto finish;
320
321
    ff_h264_draw_horiz_band(h, sl, 0, h->avctx->height);
322
323
finish:
324
    return ret;
325
}
326
327
/** Decode the given H.264 slice with VA API. */
328
static int vaapi_h264_decode_slice(AVCodecContext *avctx,
329
                                   const uint8_t  *buffer,
330
                                   uint32_t        size)
331
{
332
    const H264Context *h = avctx->priv_data;
333
    VAAPIDecodePicture *pic = h->cur_pic_ptr->hwaccel_picture_private;
334
    const H264SliceContext *sl  = &h->slice_ctx[0];
335
    VASliceParameterBufferH264 slice_param;
336
    int err;
337
338
    slice_param = (VASliceParameterBufferH264) {
339
        .slice_data_size               = size,
340
        .slice_data_offset             = 0,
341
        .slice_data_flag               = VA_SLICE_DATA_FLAG_ALL,
342
        .slice_data_bit_offset         = get_bits_count(&sl->gb),
343
        .first_mb_in_slice             = (sl->mb_y >> FIELD_OR_MBAFF_PICTURE(h)) * h->mb_width + sl->mb_x,
344
        .slice_type                    = ff_h264_get_slice_type(sl),
345
        .direct_spatial_mv_pred_flag   = sl->slice_type == AV_PICTURE_TYPE_B ? sl->direct_spatial_mv_pred : 0,
346
        .num_ref_idx_l0_active_minus1  = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0,
347
        .num_ref_idx_l1_active_minus1  = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0,
348
        .cabac_init_idc                = sl->cabac_init_idc,
349
        .slice_qp_delta                = sl->qscale - h->ps.pps->init_qp,
350
        .disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter,
351
        .slice_alpha_c0_offset_div2    = sl->slice_alpha_c0_offset / 2,
352
        .slice_beta_offset_div2        = sl->slice_beta_offset     / 2,
353
        .luma_log2_weight_denom        = sl->pwt.luma_log2_weight_denom,
354
        .chroma_log2_weight_denom      = sl->pwt.chroma_log2_weight_denom,
355
    };
356
357
    fill_vaapi_RefPicList(slice_param.RefPicList0, sl->ref_list[0],
358
                          sl->list_count > 0 ? sl->ref_count[0] : 0);
359
    fill_vaapi_RefPicList(slice_param.RefPicList1, sl->ref_list[1],
360
                          sl->list_count > 1 ? sl->ref_count[1] : 0);
361
362
    fill_vaapi_plain_pred_weight_table(h, 0,
363
                                       &slice_param.luma_weight_l0_flag,
364
                                       slice_param.luma_weight_l0,
365
                                       slice_param.luma_offset_l0,
366
                                       &slice_param.chroma_weight_l0_flag,
367
                                       slice_param.chroma_weight_l0,
368
                                       slice_param.chroma_offset_l0);
369
    fill_vaapi_plain_pred_weight_table(h, 1,
370
                                       &slice_param.luma_weight_l1_flag,
371
                                       slice_param.luma_weight_l1,
372
                                       slice_param.luma_offset_l1,
373
                                       &slice_param.chroma_weight_l1_flag,
374
                                       slice_param.chroma_weight_l1,
375
                                       slice_param.chroma_offset_l1);
376
377
    err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
378
                                            &slice_param, sizeof(slice_param),
379
                                            buffer, size);
380
    if (err) {
381
        ff_vaapi_decode_cancel(avctx, pic);
382
        return err;
383
    }
384
385
    return 0;
386
}
387
388
const AVHWAccel ff_h264_vaapi_hwaccel = {
389
    .name                 = "h264_vaapi",
390
    .type                 = AVMEDIA_TYPE_VIDEO,
391
    .id                   = AV_CODEC_ID_H264,
392
    .pix_fmt              = AV_PIX_FMT_VAAPI,
393
    .start_frame          = &vaapi_h264_start_frame,
394
    .end_frame            = &vaapi_h264_end_frame,
395
    .decode_slice         = &vaapi_h264_decode_slice,
396
    .frame_priv_data_size = sizeof(VAAPIDecodePicture),
397
    .init                 = &ff_vaapi_decode_init,
398
    .uninit               = &ff_vaapi_decode_uninit,
399
    .frame_params         = &ff_vaapi_common_frame_params,
400
    .priv_data_size       = sizeof(VAAPIDecodeContext),
401
    .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,
402
};