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 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 "vaapi_internal.h"
24#include "dsputil.h"
25
26/** Reconstruct bitstream f_code */
27static inline int mpeg2_get_f_code(MpegEncContext *s)
28{
29    return (s->mpeg_f_code[0][0] << 12) | (s->mpeg_f_code[0][1] << 8) |
30           (s->mpeg_f_code[1][0] <<  4) |  s->mpeg_f_code[1][1];
31}
32
33/** Determine frame start: first field for field picture or frame picture */
34static inline int mpeg2_get_is_frame_start(MpegEncContext *s)
35{
36    return s->first_field || s->picture_structure == PICT_FRAME;
37}
38
39static int vaapi_mpeg2_start_frame(AVCodecContext *avctx, av_unused const uint8_t *buffer, av_unused uint32_t size)
40{
41    struct MpegEncContext * const s = avctx->priv_data;
42    struct vaapi_context * const vactx = avctx->hwaccel_context;
43    VAPictureParameterBufferMPEG2 *pic_param;
44    VAIQMatrixBufferMPEG2 *iq_matrix;
45    int i;
46
47    av_dlog(avctx, "vaapi_mpeg2_start_frame()\n");
48
49    vactx->slice_param_size = sizeof(VASliceParameterBufferMPEG2);
50
51    /* Fill in VAPictureParameterBufferMPEG2 */
52    pic_param = ff_vaapi_alloc_pic_param(vactx, sizeof(VAPictureParameterBufferMPEG2));
53    if (!pic_param)
54        return -1;
55    pic_param->horizontal_size                                  = s->width;
56    pic_param->vertical_size                                    = s->height;
57    pic_param->forward_reference_picture                        = VA_INVALID_ID;
58    pic_param->backward_reference_picture                       = VA_INVALID_ID;
59    pic_param->picture_coding_type                              = s->pict_type;
60    pic_param->f_code                                           = mpeg2_get_f_code(s);
61    pic_param->picture_coding_extension.value                   = 0; /* reset all bits */
62    pic_param->picture_coding_extension.bits.intra_dc_precision = s->intra_dc_precision;
63    pic_param->picture_coding_extension.bits.picture_structure  = s->picture_structure;
64    pic_param->picture_coding_extension.bits.top_field_first    = s->top_field_first;
65    pic_param->picture_coding_extension.bits.frame_pred_frame_dct = s->frame_pred_frame_dct;
66    pic_param->picture_coding_extension.bits.concealment_motion_vectors = s->concealment_motion_vectors;
67    pic_param->picture_coding_extension.bits.q_scale_type       = s->q_scale_type;
68    pic_param->picture_coding_extension.bits.intra_vlc_format   = s->intra_vlc_format;
69    pic_param->picture_coding_extension.bits.alternate_scan     = s->alternate_scan;
70    pic_param->picture_coding_extension.bits.repeat_first_field = s->repeat_first_field;
71    pic_param->picture_coding_extension.bits.progressive_frame  = s->progressive_frame;
72    pic_param->picture_coding_extension.bits.is_first_field     = mpeg2_get_is_frame_start(s);
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);
77        // fall-through
78    case AV_PICTURE_TYPE_P:
79        pic_param->forward_reference_picture = ff_vaapi_get_surface_id(&s->last_picture);
80        break;
81    }
82
83    /* Fill in VAIQMatrixBufferMPEG2 */
84    iq_matrix = ff_vaapi_alloc_iq_matrix(vactx, sizeof(VAIQMatrixBufferMPEG2));
85    if (!iq_matrix)
86        return -1;
87    iq_matrix->load_intra_quantiser_matrix              = 1;
88    iq_matrix->load_non_intra_quantiser_matrix          = 1;
89    iq_matrix->load_chroma_intra_quantiser_matrix       = 1;
90    iq_matrix->load_chroma_non_intra_quantiser_matrix   = 1;
91
92    for (i = 0; i < 64; i++) {
93        int n = s->dsp.idct_permutation[ff_zigzag_direct[i]];
94        iq_matrix->intra_quantiser_matrix[i]            = s->intra_matrix[n];
95        iq_matrix->non_intra_quantiser_matrix[i]        = s->inter_matrix[n];
96        iq_matrix->chroma_intra_quantiser_matrix[i]     = s->chroma_intra_matrix[n];
97        iq_matrix->chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
98    }
99    return 0;
100}
101
102static int vaapi_mpeg2_end_frame(AVCodecContext *avctx)
103{
104    return ff_vaapi_common_end_frame(avctx->priv_data);
105}
106
107static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
108{
109    MpegEncContext * const s = avctx->priv_data;
110    VASliceParameterBufferMPEG2 *slice_param;
111    GetBitContext gb;
112    uint32_t quantiser_scale_code, intra_slice_flag, macroblock_offset;
113
114    av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
115
116    /* Determine macroblock_offset */
117    init_get_bits(&gb, buffer, 8 * size);
118    if (get_bits_long(&gb, 32) >> 8 != 1) /* start code */
119        return AVERROR_INVALIDDATA;
120    quantiser_scale_code = get_bits(&gb, 5);
121    intra_slice_flag = get_bits1(&gb);
122    if (intra_slice_flag) {
123        skip_bits(&gb, 8);
124        while (get_bits1(&gb) != 0)
125            skip_bits(&gb, 8);
126    }
127    macroblock_offset = get_bits_count(&gb);
128
129    /* Fill in VASliceParameterBufferMPEG2 */
130    slice_param = (VASliceParameterBufferMPEG2 *)ff_vaapi_alloc_slice(avctx->hwaccel_context, buffer, size);
131    if (!slice_param)
132        return -1;
133    slice_param->macroblock_offset              = macroblock_offset;
134    slice_param->slice_horizontal_position      = s->mb_x;
135    slice_param->slice_vertical_position        = s->mb_y;
136    slice_param->quantiser_scale_code           = quantiser_scale_code;
137    slice_param->intra_slice_flag               = intra_slice_flag;
138    return 0;
139}
140
141AVHWAccel ff_mpeg2_vaapi_hwaccel = {
142    .name           = "mpeg2_vaapi",
143    .type           = AVMEDIA_TYPE_VIDEO,
144    .id             = CODEC_ID_MPEG2VIDEO,
145    .pix_fmt        = PIX_FMT_VAAPI_VLD,
146    .start_frame    = vaapi_mpeg2_start_frame,
147    .end_frame      = vaapi_mpeg2_end_frame,
148    .decode_slice   = vaapi_mpeg2_decode_slice,
149};
150