f6ef5e52abc21549a2c4822bb9e989ec29969fc2
[ffmpeg.git] / libavcodec / dxva2_mpeg2.c
1 /*
2  * MPEG-2 HW acceleration.
3  *
4  * copyright (c) 2010 Laurent Aimar
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 "libavutil/log.h"
24 #include "dxva2_internal.h"
25 #include "mpegutils.h"
26
27 #define MAX_SLICES 1024
28 struct dxva2_picture_context {
29     DXVA_PictureParameters pp;
30     DXVA_QmatrixData       qm;
31     unsigned               slice_count;
32     DXVA_SliceInfo         slice[MAX_SLICES];
33
34     const uint8_t          *bitstream;
35     unsigned               bitstream_size;
36 };
37
38 static void fill_picture_parameters(AVCodecContext *avctx,
39                                     struct dxva_context *ctx,
40                                     const struct MpegEncContext *s,
41                                     DXVA_PictureParameters *pp)
42 {
43     const Picture *current_picture = s->current_picture_ptr;
44     int is_field = s->picture_structure != PICT_FRAME;
45
46     memset(pp, 0, sizeof(*pp));
47     pp->wDecodedPictureIndex         = ff_dxva2_get_surface_index(ctx, current_picture->f);
48     pp->wDeblockedPictureIndex       = 0;
49     if (s->pict_type != AV_PICTURE_TYPE_I)
50         pp->wForwardRefPictureIndex  = ff_dxva2_get_surface_index(ctx, s->last_picture.f);
51     else
52         pp->wForwardRefPictureIndex  = 0xffff;
53     if (s->pict_type == AV_PICTURE_TYPE_B)
54         pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(ctx, s->next_picture.f);
55     else
56         pp->wBackwardRefPictureIndex = 0xffff;
57     pp->wPicWidthInMBminus1          = s->mb_width  - 1;
58     pp->wPicHeightInMBminus1         = (s->mb_height >> is_field) - 1;
59     pp->bMacroblockWidthMinus1       = 15;
60     pp->bMacroblockHeightMinus1      = 15;
61     pp->bBlockWidthMinus1            = 7;
62     pp->bBlockHeightMinus1           = 7;
63     pp->bBPPminus1                   = 7;
64     pp->bPicStructure                = s->picture_structure;
65     pp->bSecondField                 = is_field && !s->first_field;
66     pp->bPicIntra                    = s->pict_type == AV_PICTURE_TYPE_I;
67     pp->bPicBackwardPrediction       = s->pict_type == AV_PICTURE_TYPE_B;
68     pp->bBidirectionalAveragingMode  = 0;
69     pp->bMVprecisionAndChromaRelation= 0; /* FIXME */
70     pp->bChromaFormat                = s->chroma_format;
71     pp->bPicScanFixed                = 1;
72     pp->bPicScanMethod               = s->alternate_scan ? 1 : 0;
73     pp->bPicReadbackRequests         = 0;
74     pp->bRcontrol                    = 0;
75     pp->bPicSpatialResid8            = 0;
76     pp->bPicOverflowBlocks           = 0;
77     pp->bPicExtrapolation            = 0;
78     pp->bPicDeblocked                = 0;
79     pp->bPicDeblockConfined          = 0;
80     pp->bPic4MVallowed               = 0;
81     pp->bPicOBMC                     = 0;
82     pp->bPicBinPB                    = 0;
83     pp->bMV_RPS                      = 0;
84     pp->bReservedBits                = 0;
85     pp->wBitstreamFcodes             = (s->mpeg_f_code[0][0] << 12) |
86                                        (s->mpeg_f_code[0][1] <<  8) |
87                                        (s->mpeg_f_code[1][0] <<  4) |
88                                        (s->mpeg_f_code[1][1]      );
89     pp->wBitstreamPCEelements        = (s->intra_dc_precision         << 14) |
90                                        (s->picture_structure          << 12) |
91                                        (s->top_field_first            << 11) |
92                                        (s->frame_pred_frame_dct       << 10) |
93                                        (s->concealment_motion_vectors <<  9) |
94                                        (s->q_scale_type               <<  8) |
95                                        (s->intra_vlc_format           <<  7) |
96                                        (s->alternate_scan             <<  6) |
97                                        (s->repeat_first_field         <<  5) |
98                                        (s->chroma_420_type            <<  4) |
99                                        (s->progressive_frame          <<  3);
100     pp->bBitstreamConcealmentNeed    = 0;
101     pp->bBitstreamConcealmentMethod  = 0;
102 }
103
104 static void fill_quantization_matrices(AVCodecContext *avctx,
105                                        struct dxva_context *ctx,
106                                        const struct MpegEncContext *s,
107                                        DXVA_QmatrixData *qm)
108 {
109     int i;
110     for (i = 0; i < 4; i++)
111         qm->bNewQmatrix[i] = 1;
112     for (i = 0; i < 64; i++) {
113         int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
114         qm->Qmatrix[0][i] = s->intra_matrix[n];;
115         qm->Qmatrix[1][i] = s->inter_matrix[n];;
116         qm->Qmatrix[2][i] = s->chroma_intra_matrix[n];;
117         qm->Qmatrix[3][i] = s->chroma_inter_matrix[n];;
118     }
119 }
120
121 static void fill_slice(AVCodecContext *avctx,
122                        const struct MpegEncContext *s,
123                        DXVA_SliceInfo *slice,
124                        unsigned position,
125                        const uint8_t *buffer, unsigned size)
126 {
127     int is_field = s->picture_structure != PICT_FRAME;
128     GetBitContext gb;
129
130     memset(slice, 0, sizeof(*slice));
131     slice->wHorizontalPosition = s->mb_x;
132     slice->wVerticalPosition   = s->mb_y >> is_field;
133     slice->dwSliceBitsInBuffer = 8 * size;
134     slice->dwSliceDataLocation = position;
135     slice->bStartCodeBitOffset = 0;
136     slice->bReservedBits       = 0;
137     /* XXX We store the index of the first MB and it will be fixed later */
138     slice->wNumberMBsInSlice   = (s->mb_y >> is_field) * s->mb_width + s->mb_x;
139     slice->wBadSliceChopping   = 0;
140
141     init_get_bits(&gb, &buffer[4], 8 * (size - 4));
142
143     slice->wQuantizerScaleCode = get_bits(&gb, 5);
144     while (get_bits1(&gb))
145         skip_bits(&gb, 8);
146
147     slice->wMBbitOffset        = 4 * 8 + get_bits_count(&gb);
148 }
149 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
150                                              DXVA2_DecodeBufferDesc *bs,
151                                              DXVA2_DecodeBufferDesc *sc)
152 {
153     const struct MpegEncContext *s = avctx->priv_data;
154     struct dxva_context *ctx = avctx->hwaccel_context;
155     struct dxva2_picture_context *ctx_pic =
156         s->current_picture_ptr->hwaccel_picture_private;
157     const int is_field = s->picture_structure != PICT_FRAME;
158     const unsigned mb_count = s->mb_width * (s->mb_height >> is_field);
159     uint8_t  *dxva_data, *current, *end;
160     unsigned dxva_size;
161     unsigned i;
162
163     if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
164                                               DXVA2_BitStreamDateBufferType,
165                                               &dxva_data, &dxva_size)))
166         return -1;
167     current = dxva_data;
168     end = dxva_data + dxva_size;
169
170     for (i = 0; i < ctx_pic->slice_count; i++) {
171         DXVA_SliceInfo *slice = &ctx_pic->slice[i];
172         unsigned position = slice->dwSliceDataLocation;
173         unsigned size     = slice->dwSliceBitsInBuffer / 8;
174         if (size > end - current) {
175             av_log(avctx, AV_LOG_ERROR, "Failed to build bitstream");
176             break;
177         }
178         slice->dwSliceDataLocation = current - dxva_data;
179
180         if (i < ctx_pic->slice_count - 1)
181             slice->wNumberMBsInSlice =
182                 slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
183         else
184             slice->wNumberMBsInSlice =
185                 mb_count - slice[0].wNumberMBsInSlice;
186
187         memcpy(current, &ctx_pic->bitstream[position], size);
188         current += size;
189     }
190     if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
191                                                   DXVA2_BitStreamDateBufferType)))
192         return -1;
193     if (i < ctx_pic->slice_count)
194         return -1;
195
196     memset(bs, 0, sizeof(*bs));
197     bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
198     bs->DataSize             = current - dxva_data;
199     bs->NumMBsInBuffer       = mb_count;
200
201     return ff_dxva2_commit_buffer(avctx, ctx, sc,
202                                   DXVA2_SliceControlBufferType,
203                                   ctx_pic->slice,
204                                   ctx_pic->slice_count * sizeof(*ctx_pic->slice),
205                                   mb_count);
206 }
207
208 static int dxva2_mpeg2_start_frame(AVCodecContext *avctx,
209                                    av_unused const uint8_t *buffer,
210                                    av_unused uint32_t size)
211 {
212     const struct MpegEncContext *s = avctx->priv_data;
213     struct dxva_context *ctx = avctx->hwaccel_context;
214     struct dxva2_picture_context *ctx_pic =
215         s->current_picture_ptr->hwaccel_picture_private;
216
217     if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
218         return -1;
219     assert(ctx_pic);
220
221     fill_picture_parameters(avctx, ctx, s, &ctx_pic->pp);
222     fill_quantization_matrices(avctx, ctx, s, &ctx_pic->qm);
223
224     ctx_pic->slice_count    = 0;
225     ctx_pic->bitstream_size = 0;
226     ctx_pic->bitstream      = NULL;
227     return 0;
228 }
229
230 static int dxva2_mpeg2_decode_slice(AVCodecContext *avctx,
231                                     const uint8_t *buffer, uint32_t size)
232 {
233     const struct MpegEncContext *s = avctx->priv_data;
234     struct dxva2_picture_context *ctx_pic =
235         s->current_picture_ptr->hwaccel_picture_private;
236     unsigned position;
237
238     if (ctx_pic->slice_count >= MAX_SLICES) {
239         avpriv_request_sample(avctx, "%d slices in dxva2",
240                               ctx_pic->slice_count);
241         return -1;
242     }
243     if (!ctx_pic->bitstream)
244         ctx_pic->bitstream = buffer;
245     ctx_pic->bitstream_size += size;
246
247     position = buffer - ctx_pic->bitstream;
248     fill_slice(avctx, s, &ctx_pic->slice[ctx_pic->slice_count++], position,
249                buffer, size);
250     return 0;
251 }
252
253 static int dxva2_mpeg2_end_frame(AVCodecContext *avctx)
254 {
255     struct MpegEncContext *s = avctx->priv_data;
256     struct dxva2_picture_context *ctx_pic =
257         s->current_picture_ptr->hwaccel_picture_private;
258     int ret;
259
260     if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
261         return -1;
262     ret = ff_dxva2_common_end_frame(avctx, s->current_picture_ptr->f,
263                                     &ctx_pic->pp, sizeof(ctx_pic->pp),
264                                     &ctx_pic->qm, sizeof(ctx_pic->qm),
265                                     commit_bitstream_and_slice_buffer);
266     if (!ret)
267         ff_mpeg_draw_horiz_band(s, 0, avctx->height);
268     return ret;
269 }
270
271 AVHWAccel ff_mpeg2_dxva2_hwaccel = {
272     .name           = "mpeg2_dxva2",
273     .type           = AVMEDIA_TYPE_VIDEO,
274     .id             = AV_CODEC_ID_MPEG2VIDEO,
275     .pix_fmt        = AV_PIX_FMT_DXVA2_VLD,
276     .start_frame    = dxva2_mpeg2_start_frame,
277     .decode_slice   = dxva2_mpeg2_decode_slice,
278     .end_frame      = dxva2_mpeg2_end_frame,
279     .frame_priv_data_size = sizeof(struct dxva2_picture_context),
280 };