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 "hwconfig.h"
24#include "mpegutils.h"
25#include "mpegvideo.h"
26#include "mpegvideodec.h"
27#include "vaapi_decode.h"
28
29/** Reconstruct bitstream f_code */
30static inline int mpeg2_get_f_code(const MpegEncContext *s)
31{
32    return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
33           (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
34}
35
36/** Determine frame start: first field for field picture or frame picture */
37static inline int mpeg2_get_is_frame_start(const MpegEncContext *s)
38{
39    return s->first_field || s->picture_structure == PICT_FRAME;
40}
41
42static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
43{
44    const MpegEncContext *s = avctx->priv_data;
45    VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
46    VAPictureParameterBufferMPEG2 pic_param;
47    VAIQMatrixBufferMPEG2 iq_matrix;
48    int i, err;
49
50    pic->output_surface = ff_vaapi_get_surface_id(s->current_picture_ptr->f);
51
52    pic_param = (VAPictureParameterBufferMPEG2) {
53        .horizontal_size                 = s->width,
54        .vertical_size                   = s->height,
55        .forward_reference_picture       = VA_INVALID_ID,
56        .backward_reference_picture      = VA_INVALID_ID,
57        .picture_coding_type             = s->pict_type,
58        .f_code                          = mpeg2_get_f_code(s),
59        .picture_coding_extension.bits = {
60            .intra_dc_precision          = s->intra_dc_precision,
61            .picture_structure           = s->picture_structure,
62            .top_field_first             = s->top_field_first,
63            .frame_pred_frame_dct        = s->frame_pred_frame_dct,
64            .concealment_motion_vectors  = s->concealment_motion_vectors,
65            .q_scale_type                = s->q_scale_type,
66            .intra_vlc_format            = s->intra_vlc_format,
67            .alternate_scan              = s->alternate_scan,
68            .repeat_first_field          = s->repeat_first_field,
69            .progressive_frame           = s->progressive_frame,
70            .is_first_field              = mpeg2_get_is_frame_start(s),
71        },
72    };
73
74    switch (s->pict_type) {
75    case AV_PICTURE_TYPE_B:
76        pic_param.backward_reference_picture = ff_vaapi_get_surface_id(s->next_picture.f);
77        // fall-through
78    case AV_PICTURE_TYPE_P:
79        pic_param.forward_reference_picture = ff_vaapi_get_surface_id(s->last_picture.f);
80        break;
81    }
82
83    err = ff_vaapi_decode_make_param_buffer(avctx, pic,
84                                            VAPictureParameterBufferType,
85                                            &pic_param, sizeof(pic_param));
86    if (err < 0)
87        goto fail;
88
89    iq_matrix.load_intra_quantiser_matrix              = 1;
90    iq_matrix.load_non_intra_quantiser_matrix          = 1;
91    iq_matrix.load_chroma_intra_quantiser_matrix       = 1;
92    iq_matrix.load_chroma_non_intra_quantiser_matrix   = 1;
93
94    for (i = 0; i < 64; i++) {
95        int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
96        iq_matrix.intra_quantiser_matrix[i]            = s->intra_matrix[n];
97        iq_matrix.non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
98        iq_matrix.chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
99        iq_matrix.chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
100    }
101
102    err = ff_vaapi_decode_make_param_buffer(avctx, pic,
103                                            VAIQMatrixBufferType,
104                                            &iq_matrix, sizeof(iq_matrix));
105    if (err < 0)
106        goto fail;
107
108    return 0;
109
110fail:
111    ff_vaapi_decode_cancel(avctx, pic);
112    return err;
113}
114
115static int vaapi_mpeg2_end_frame(AVCodecContext *avctx)
116{
117    MpegEncContext     *s   = avctx->priv_data;
118    VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
119    int ret;
120
121    ret = ff_vaapi_decode_issue(avctx, pic);
122    if (ret < 0)
123        goto fail;
124
125    ff_mpeg_draw_horiz_band(s, 0, s->avctx->height);
126
127fail:
128    return ret;
129}
130
131static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
132{
133    const MpegEncContext *s = avctx->priv_data;
134    VAAPIDecodePicture *pic = s->current_picture_ptr->hwaccel_picture_private;
135    VASliceParameterBufferMPEG2 slice_param;
136    GetBitContext gb;
137    uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
138    int err;
139
140    /* Determine macroblock_offset */
141    init_get_bits(&gb, buffer, 8 * size);
142    if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
143        return AVERROR_INVALIDDATA;
144    quantiser_scale_code = get_bits(&gb, 5);
145    intra_slice_flag = get_bits1(&gb);
146    if (intra_slice_flag) {
147        skip_bits(&gb, 8);
148        if (skip_1stop_8data_bits(&gb) < 0)
149            return AVERROR_INVALIDDATA;
150    }
151    macroblock_offset = get_bits_count(&gb);
152
153    slice_param = (VASliceParameterBufferMPEG2) {
154        .slice_data_size            = size,
155        .slice_data_offset          = 0,
156        .slice_data_flag            = VA_SLICE_DATA_FLAG_ALL,
157        .macroblock_offset          = macroblock_offset,
158        .slice_horizontal_position  = s->mb_x,
159        .slice_vertical_position    = s->mb_y >> (s->picture_structure != PICT_FRAME),
160        .quantiser_scale_code       = quantiser_scale_code,
161        .intra_slice_flag           = intra_slice_flag,
162    };
163
164    err = ff_vaapi_decode_make_slice_buffer(avctx, pic,
165                                            &slice_param, sizeof(slice_param),
166                                            buffer, size);
167    if (err < 0) {
168        ff_vaapi_decode_cancel(avctx, pic);
169        return err;
170    }
171
172    return 0;
173}
174
175const AVHWAccel ff_mpeg2_vaapi_hwaccel = {
176    .name                 = "mpeg2_vaapi",
177    .type                 = AVMEDIA_TYPE_VIDEO,
178    .id                   = AV_CODEC_ID_MPEG2VIDEO,
179    .pix_fmt              = AV_PIX_FMT_VAAPI,
180    .start_frame          = &vaapi_mpeg2_start_frame,
181    .end_frame            = &vaapi_mpeg2_end_frame,
182    .decode_slice         = &vaapi_mpeg2_decode_slice,
183    .frame_priv_data_size = sizeof(VAAPIDecodePicture),
184    .init                 = &ff_vaapi_decode_init,
185    .uninit               = &ff_vaapi_decode_uninit,
186    .frame_params         = &ff_vaapi_common_frame_params,
187    .priv_data_size       = sizeof(VAAPIDecodeContext),
188    .caps_internal        = HWACCEL_CAP_ASYNC_SAFE,
189};
190