j2k: restructure bitstream decoding
[ffmpeg.git] / libavcodec / vdpau_mpeg12.c
1 /*
2  * MPEG-1/2 HW decode acceleration through VDPAU
3  *
4  * Copyright (c) 2008 NVIDIA
5  * Copyright (c) 2013 RĂ©mi 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 "vdpau.h"
28 #include "vdpau_internal.h"
29
30 static int vdpau_mpeg_start_frame(AVCodecContext *avctx,
31                                   const uint8_t *buffer, uint32_t size)
32 {
33     MpegEncContext * const s = avctx->priv_data;
34     AVVDPAUContext *hwctx    = avctx->hwaccel_context;
35     VdpPictureInfoMPEG1Or2 *info = &hwctx->info.mpeg;
36     VdpVideoSurface ref;
37     int i;
38
39     /* fill VdpPictureInfoMPEG1Or2 struct */
40     info->forward_reference  = VDP_INVALID_HANDLE;
41     info->backward_reference = VDP_INVALID_HANDLE;
42
43     switch (s->pict_type) {
44     case AV_PICTURE_TYPE_B:
45         ref = ff_vdpau_get_surface_id(&s->next_picture);
46         assert(ref != VDP_INVALID_HANDLE);
47         hwctx->info.mpeg.backward_reference = ref;
48         /* fall through to forward prediction */
49     case AV_PICTURE_TYPE_P:
50         ref = ff_vdpau_get_surface_id(&s->last_picture);
51         hwctx->info.mpeg.forward_reference  = ref;
52     }
53
54     info->slice_count                = 0;
55     info->picture_structure          = s->picture_structure;
56     info->picture_coding_type        = s->pict_type;
57     info->intra_dc_precision         = s->intra_dc_precision;
58     info->frame_pred_frame_dct       = s->frame_pred_frame_dct;
59     info->concealment_motion_vectors = s->concealment_motion_vectors;
60     info->intra_vlc_format           = s->intra_vlc_format;
61     info->alternate_scan             = s->alternate_scan;
62     info->q_scale_type               = s->q_scale_type;
63     info->top_field_first            = s->top_field_first;
64     // Both for MPEG-1 only, zero for MPEG-2:
65     info->full_pel_forward_vector    = s->full_pel[0];
66     info->full_pel_backward_vector   = s->full_pel[1];
67     // For MPEG-1 fill both horizontal & vertical:
68     info->f_code[0][0]               = s->mpeg_f_code[0][0];
69     info->f_code[0][1]               = s->mpeg_f_code[0][1];
70     info->f_code[1][0]               = s->mpeg_f_code[1][0];
71     info->f_code[1][1]               = s->mpeg_f_code[1][1];
72     for (i = 0; i < 64; ++i) {
73         info->intra_quantizer_matrix[i]     = s->intra_matrix[i];
74         info->non_intra_quantizer_matrix[i] = s->inter_matrix[i];
75     }
76
77     return ff_vdpau_common_start_frame(avctx, buffer, size);
78 }
79
80 static int vdpau_mpeg_decode_slice(AVCodecContext *avctx,
81                                    const uint8_t *buffer, uint32_t size)
82 {
83     AVVDPAUContext *hwctx = avctx->hwaccel_context;
84     int val;
85
86     val = ff_vdpau_add_buffer(avctx, buffer, size);
87     if (val < 0)
88         return val;
89
90     hwctx->info.mpeg.slice_count++;
91     return 0;
92 }
93
94 #if CONFIG_MPEG1_VDPAU_HWACCEL
95 AVHWAccel ff_mpeg1_vdpau_hwaccel = {
96     .name           = "mpeg1_vdpau",
97     .type           = AVMEDIA_TYPE_VIDEO,
98     .id             = AV_CODEC_ID_MPEG1VIDEO,
99     .pix_fmt        = AV_PIX_FMT_VDPAU,
100     .start_frame    = vdpau_mpeg_start_frame,
101     .end_frame      = ff_vdpau_mpeg_end_frame,
102     .decode_slice   = vdpau_mpeg_decode_slice,
103 };
104 #endif
105
106 #if CONFIG_MPEG2_VDPAU_HWACCEL
107 AVHWAccel ff_mpeg2_vdpau_hwaccel = {
108     .name           = "mpeg2_vdpau",
109     .type           = AVMEDIA_TYPE_VIDEO,
110     .id             = AV_CODEC_ID_MPEG2VIDEO,
111     .pix_fmt        = AV_PIX_FMT_VDPAU,
112     .start_frame    = vdpau_mpeg_start_frame,
113     .end_frame      = ff_vdpau_mpeg_end_frame,
114     .decode_slice   = vdpau_mpeg_decode_slice,
115 };
116 #endif