1/*
2 * MPEG-4 Part 2 / H.263 decode acceleration through VDPAU
3 *
4 * Copyright (c) 2008 NVIDIA
5 * Copyright (c) 2013 Rémi Denis-Courmont
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <vdpau/vdpau.h>
25
26#include "avcodec.h"
27#include "hwconfig.h"
28#include "mpeg4videodec.h"
29#include "vdpau.h"
30#include "vdpau_internal.h"
31
32static int vdpau_mpeg4_start_frame(AVCodecContext *avctx,
33                                   const uint8_t *buffer, uint32_t size)
34{
35    Mpeg4DecContext *ctx = avctx->priv_data;
36    MpegEncContext * const s = &ctx->m;
37    Picture *pic             = s->current_picture_ptr;
38    struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
39    VdpPictureInfoMPEG4Part2 *info = &pic_ctx->info.mpeg4;
40    VdpVideoSurface ref;
41    int i;
42
43    /* fill VdpPictureInfoMPEG4Part2 struct */
44    info->forward_reference  = VDP_INVALID_HANDLE;
45    info->backward_reference = VDP_INVALID_HANDLE;
46    info->vop_coding_type    = 0;
47
48    switch (s->pict_type) {
49    case AV_PICTURE_TYPE_B:
50        ref = ff_vdpau_get_surface_id(s->next_picture.f);
51        assert(ref != VDP_INVALID_HANDLE);
52        info->backward_reference = ref;
53        info->vop_coding_type    = 2;
54        /* fall-through */
55    case AV_PICTURE_TYPE_P:
56        ref = ff_vdpau_get_surface_id(s->last_picture.f);
57        assert(ref != VDP_INVALID_HANDLE);
58        info->forward_reference  = ref;
59    }
60
61    info->trd[0]                            = s->pp_time;
62    info->trb[0]                            = s->pb_time;
63    info->trd[1]                            = s->pp_field_time >> 1;
64    info->trb[1]                            = s->pb_field_time >> 1;
65    info->vop_time_increment_resolution     = s->avctx->framerate.num;
66    info->vop_fcode_forward                 = s->f_code;
67    info->vop_fcode_backward                = s->b_code;
68    info->resync_marker_disable             = !ctx->resync_marker;
69    info->interlaced                        = !s->progressive_sequence;
70    info->quant_type                        = s->mpeg_quant;
71    info->quarter_sample                    = s->quarter_sample;
72    info->short_video_header                = avctx->codec->id == AV_CODEC_ID_H263;
73    info->rounding_control                  = s->no_rounding;
74    info->alternate_vertical_scan_flag      = s->alternate_scan;
75    info->top_field_first                   = s->top_field_first;
76    for (i = 0; i < 64; ++i) {
77        int n = s->idsp.idct_permutation[i];
78        info->intra_quantizer_matrix[i]     = s->intra_matrix[n];
79        info->non_intra_quantizer_matrix[i] = s->inter_matrix[n];
80    }
81
82    ff_vdpau_common_start_frame(pic_ctx, buffer, size);
83    return ff_vdpau_add_buffer(pic_ctx, buffer, size);
84}
85
86static int vdpau_mpeg4_decode_slice(av_unused AVCodecContext *avctx,
87                                    av_unused const uint8_t *buffer,
88                                    av_unused uint32_t size)
89{
90     return 0;
91}
92
93static int vdpau_mpeg4_init(AVCodecContext *avctx)
94{
95    VdpDecoderProfile profile;
96
97    switch (avctx->profile) {
98    case FF_PROFILE_MPEG4_SIMPLE:
99        profile = VDP_DECODER_PROFILE_MPEG4_PART2_SP;
100        break;
101    // As any ASP decoder must be able to decode SP, this
102    // should be a safe fallback if profile is unknown/unspecified.
103    case FF_PROFILE_UNKNOWN:
104    case FF_PROFILE_MPEG4_ADVANCED_SIMPLE:
105        profile = VDP_DECODER_PROFILE_MPEG4_PART2_ASP;
106        break;
107    default:
108        return AVERROR(ENOTSUP);
109    }
110
111    return ff_vdpau_common_init(avctx, profile, avctx->level);
112}
113
114const AVHWAccel ff_mpeg4_vdpau_hwaccel = {
115    .name           = "mpeg4_vdpau",
116    .type           = AVMEDIA_TYPE_VIDEO,
117    .id             = AV_CODEC_ID_MPEG4,
118    .pix_fmt        = AV_PIX_FMT_VDPAU,
119    .start_frame    = vdpau_mpeg4_start_frame,
120    .end_frame      = ff_vdpau_mpeg_end_frame,
121    .decode_slice   = vdpau_mpeg4_decode_slice,
122    .frame_priv_data_size = sizeof(struct vdpau_picture_context),
123    .init           = vdpau_mpeg4_init,
124    .uninit         = ff_vdpau_common_uninit,
125    .frame_params   = ff_vdpau_common_frame_params,
126    .priv_data_size = sizeof(VDPAUContext),
127    .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,
128};
129