b2417ee83046f9127b4228af5298bf3224f1dbc6
[ffmpeg.git] / libavcodec / vaapi_mpeg2.c
1 /*
2  * MPEG-2 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 "mpegutils.h"
24 #include "mpegvideo.h"
25 #include "internal.h"
26 #include "vaapi_decode.h"
27
28 /** Reconstruct bitstream f_code */
29 static inline int mpeg2_get_f_code(const MpegEncContext *s)
30 {
31     return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
32            (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
33 }
34
35 /** Determine frame start: first field for field picture or frame picture */
36 static inline int mpeg2_get_is_frame_start(const MpegEncContext *s)
37 {
38     return s->first_field || s->picture_structure == PICT_FRAME;
39 }
40
41 static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
42 {
43     const MpegEncContext *s = avctx->priv_data;
44     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
45     VAPictureParameterBufferMPEG2 pic_param;
46     VAIQMatrixBufferMPEG2 iq_matrix;
47     int i, err;
48
49     pic->output_surface = ff_vaapi_get_surface_id(s->current_picture_ptr->f);
50
51     pic_param = (VAPictureParameterBufferMPEG2) {
52         .horizontal_size                 = s->width,
53         .vertical_size                   = s->height,
54         .forward_reference_picture       = VA_INVALID_ID,
55         .backward_reference_picture      = VA_INVALID_ID,
56         .picture_coding_type             = s->pict_type,
57         .f_code                          = mpeg2_get_f_code(s),
58         .picture_coding_extension.bits = {
59             .intra_dc_precision          = s->intra_dc_precision,
60             .picture_structure           = s->picture_structure,
61             .top_field_first             = s->top_field_first,
62             .frame_pred_frame_dct        = s->frame_pred_frame_dct,
63             .concealment_motion_vectors  = s->concealment_motion_vectors,
64             .q_scale_type                = s->q_scale_type,
65             .intra_vlc_format            = s->intra_vlc_format,
66             .alternate_scan              = s->alternate_scan,
67             .repeat_first_field          = s->repeat_first_field,
68             .progressive_frame           = s->progressive_frame,
69             .is_first_field              = mpeg2_get_is_frame_start(s),
70         },
71     };
72
73     switch (s->pict_type) {
74     case AV_PICTURE_TYPE_B:
75         pic_param.backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
76         // fall-through
77     case AV_PICTURE_TYPE_P:
78         pic_param.forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
79         break;
80     }
81
82     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
83                                             VAPictureParameterBufferType,
84                                             &pic_param, sizeof(pic_param));
85     if (err < 0)
86         goto fail;
87
88     iq_matrix.load_intra_quantiser_matrix              = 1;
89     iq_matrix.load_non_intra_quantiser_matrix          = 1;
90     iq_matrix.load_chroma_intra_quantiser_matrix       = 1;
91     iq_matrix.load_chroma_non_intra_quantiser_matrix   = 1;
92
93     for (i = 0; i < 64; i++) {
94         int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
95         iq_matrix.intra_quantiser_matrix[i]            = s->intra_matrix[n];
96         iq_matrix.non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
97         iq_matrix.chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
98         iq_matrix.chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
99     }
100
101     err = ff_vaapi_decode_make_param_buffer(avctx, pic,
102                                             VAIQMatrixBufferType,
103                                             &iq_matrix, sizeof(iq_matrix));
104     if (err < 0)
105         goto fail;
106
107     return 0;
108
109 fail:
110     ff_vaapi_decode_cancel(avctx, pic);
111     return err;
112 }
113
114 static int vaapi_mpeg2_end_frame(AVCodecContext *avctx)
115 {
116     MpegEncContext     *s   = avctx->priv_data;
117     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
118     int ret;
119
120     ret = ff_vaapi_decode_issue(avctx, pic);
121     if (ret < 0)
122         goto fail;
123
124     ff_mpeg_draw_horiz_band(s, 0, s->avctx->height);
125
126 fail:
127     return ret;
128 }
129
130 static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
131 {
132     const MpegEncContext *s = avctx->priv_data;
133     VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
134     VASliceParameterBufferMPEG2 slice_param;
135     GetBitContext gb;
136     uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
137     int err;
138
139     /* Determine macroblock_offset */
140     init_get_bits(&gb, buffer, 8 * size);
141     if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
142         return AVERROR_INVALIDDATA;
143     quantiser_scale_code = get_bits(&gb, 5);
144     intra_slice_flag = get_bits1(&gb);
145     if (intra_slice_flag) {
146         skip_bits(&gb, 8);
147         if (skip_1stop_8data_bits(&gb) < 0)
148             return AVERROR_INVALIDDATA;
149     }
150     macroblock_offset = get_bits_count(&gb);
151
152     slice_param = (VASliceParameterBufferMPEG2) {
153         .slice_data_size            = size,
154         .slice_data_offset          = 0,
155         .slice_data_flag            = VA_SLICE_DATA_FLAG_ALL,
156         .macroblock_offset          = macroblock_offset,
157         .slice_horizontal_position  = s->mb_x,
158         .slice_vertical_position    = s->mb_y >> (s->picture_structure != PICT_FRAME),
159         .quantiser_scale_code       = quantiser_scale_code,
160         .intra_slice_flag           = intra_slice_flag,
161     };
162
163     err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
164                                             &slice_param, sizeof(slice_param),
165                                             buffer, size);
166     if (err < 0) {
167         ff_vaapi_decode_cancel(avctx, pic);
168         return err;
169     }
170
171     return 0;
172 }
173
174 AVHWAccel ff_mpeg2_vaapi_hwaccel = {
175     .name                 = "mpeg2_vaapi",
176     .type                 = AVMEDIA_TYPE_VIDEO,
177     .id                   = AV_CODEC_ID_MPEG2VIDEO,
178     .pix_fmt              = AV_PIX_FMT_VAAPI,
179     .start_frame          = &vaapi_mpeg2_start_frame,
180     .end_frame            = &vaapi_mpeg2_end_frame,
181     .decode_slice         = &vaapi_mpeg2_decode_slice,
182     .frame_priv_data_size = sizeof(VAAPIDecodePicture),
183     .init                 = &ff_vaapi_decode_init,
184     .uninit               = &ff_vaapi_decode_uninit,
185     .priv_data_size       = sizeof(VAAPIDecodeContext),
186 };