2 * MPEG-2 HW acceleration.
4 * copyright (c) 2010 Laurent Aimar
6 * This file is part of Libav.
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.
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.
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
23 #include "libavutil/log.h"
24 #include "dxva2_internal.h"
25 #include "mpegutils.h"
27 #define MAX_SLICES 1024
28 struct dxva2_picture_context {
29 DXVA_PictureParameters pp;
32 DXVA_SliceInfo slice[MAX_SLICES];
34 const uint8_t *bitstream;
35 unsigned bitstream_size;
38 static void fill_picture_parameters(AVCodecContext *avctx,
39 struct dxva_context *ctx,
40 const struct MpegEncContext *s,
41 DXVA_PictureParameters *pp)
43 const Picture *current_picture = s->current_picture_ptr;
44 int is_field = s->picture_structure != PICT_FRAME;
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);
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);
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;
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;
75 pp->bPicSpatialResid8 = 0;
76 pp->bPicOverflowBlocks = 0;
77 pp->bPicExtrapolation = 0;
78 pp->bPicDeblocked = 0;
79 pp->bPicDeblockConfined = 0;
80 pp->bPic4MVallowed = 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;
104 static void fill_quantization_matrices(AVCodecContext *avctx,
105 struct dxva_context *ctx,
106 const struct MpegEncContext *s,
107 DXVA_QmatrixData *qm)
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];;
121 static void fill_slice(AVCodecContext *avctx,
122 const struct MpegEncContext *s,
123 DXVA_SliceInfo *slice,
125 const uint8_t *buffer, unsigned size)
127 int is_field = s->picture_structure != PICT_FRAME;
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;
141 init_get_bits(&gb, &buffer[4], 8 * (size - 4));
143 slice->wQuantizerScaleCode = get_bits(&gb, 5);
144 while (get_bits1(&gb))
147 slice->wMBbitOffset = 4 * 8 + get_bits_count(&gb);
149 static int commit_bitstream_and_slice_buffer(AVCodecContext *avctx,
150 DXVA2_DecodeBufferDesc *bs,
151 DXVA2_DecodeBufferDesc *sc)
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;
163 if (FAILED(IDirectXVideoDecoder_GetBuffer(ctx->decoder,
164 DXVA2_BitStreamDateBufferType,
165 &dxva_data, &dxva_size)))
168 end = dxva_data + dxva_size;
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");
178 slice->dwSliceDataLocation = current - dxva_data;
180 if (i < ctx_pic->slice_count - 1)
181 slice->wNumberMBsInSlice =
182 slice[1].wNumberMBsInSlice - slice[0].wNumberMBsInSlice;
184 slice->wNumberMBsInSlice =
185 mb_count - slice[0].wNumberMBsInSlice;
187 memcpy(current, &ctx_pic->bitstream[position], size);
190 if (FAILED(IDirectXVideoDecoder_ReleaseBuffer(ctx->decoder,
191 DXVA2_BitStreamDateBufferType)))
193 if (i < ctx_pic->slice_count)
196 memset(bs, 0, sizeof(*bs));
197 bs->CompressedBufferType = DXVA2_BitStreamDateBufferType;
198 bs->DataSize = current - dxva_data;
199 bs->NumMBsInBuffer = mb_count;
201 return ff_dxva2_commit_buffer(avctx, ctx, sc,
202 DXVA2_SliceControlBufferType,
204 ctx_pic->slice_count * sizeof(*ctx_pic->slice),
208 static int dxva2_mpeg2_start_frame(AVCodecContext *avctx,
209 av_unused const uint8_t *buffer,
210 av_unused uint32_t size)
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;
217 if (!ctx->decoder || !ctx->cfg || ctx->surface_count <= 0)
221 fill_picture_parameters(avctx, ctx, s, &ctx_pic->pp);
222 fill_quantization_matrices(avctx, ctx, s, &ctx_pic->qm);
224 ctx_pic->slice_count = 0;
225 ctx_pic->bitstream_size = 0;
226 ctx_pic->bitstream = NULL;
230 static int dxva2_mpeg2_decode_slice(AVCodecContext *avctx,
231 const uint8_t *buffer, uint32_t size)
233 const struct MpegEncContext *s = avctx->priv_data;
234 struct dxva2_picture_context *ctx_pic =
235 s->current_picture_ptr->hwaccel_picture_private;
238 if (ctx_pic->slice_count >= MAX_SLICES) {
239 avpriv_request_sample(avctx, "%d slices in dxva2",
240 ctx_pic->slice_count);
243 if (!ctx_pic->bitstream)
244 ctx_pic->bitstream = buffer;
245 ctx_pic->bitstream_size += size;
247 position = buffer - ctx_pic->bitstream;
248 fill_slice(avctx, s, &ctx_pic->slice[ctx_pic->slice_count++], position,
253 static int dxva2_mpeg2_end_frame(AVCodecContext *avctx)
255 struct MpegEncContext *s = avctx->priv_data;
256 struct dxva2_picture_context *ctx_pic =
257 s->current_picture_ptr->hwaccel_picture_private;
260 if (ctx_pic->slice_count <= 0 || ctx_pic->bitstream_size <= 0)
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);
267 ff_mpeg_draw_horiz_band(s, 0, avctx->height);
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),