1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "error_resilience.h"
20 #include "mpegvideo.h"
21 #include "mpeg_er.h"
22 
set_erpic(ERPicture * dst,Picture * src)23 static void set_erpic(ERPicture *dst, Picture *src)
24 {
25     int i;
26 
27     memset(dst, 0, sizeof(*dst));
28     if (!src) {
29         dst->f  = NULL;
30         dst->tf = NULL;
31         return;
32     }
33 
34     dst->f = src->f;
35     dst->tf = &src->tf;
36 
37     for (i = 0; i < 2; i++) {
38         dst->motion_val[i] = src->motion_val[i];
39         dst->ref_index[i] = src->ref_index[i];
40     }
41 
42     dst->mb_type = src->mb_type;
43     dst->field_picture = src->field_picture;
44 }
45 
ff_mpeg_er_frame_start(MpegEncContext * s)46 void ff_mpeg_er_frame_start(MpegEncContext *s)
47 {
48     ERContext *er = &s->er;
49 
50     set_erpic(&er->cur_pic,  s->current_picture_ptr);
51     set_erpic(&er->next_pic, s->next_picture_ptr);
52     set_erpic(&er->last_pic, s->last_picture_ptr);
53 
54     er->pp_time           = s->pp_time;
55     er->pb_time           = s->pb_time;
56     er->quarter_sample    = s->quarter_sample;
57     er->partitioned_frame = s->partitioned_frame;
58 
59     ff_er_frame_start(er);
60 }
61 
mpeg_er_decode_mb(void * opaque,int ref,int mv_dir,int mv_type,int (* mv)[2][4][2],int mb_x,int mb_y,int mb_intra,int mb_skipped)62 static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
63                               int (*mv)[2][4][2], int mb_x, int mb_y,
64                               int mb_intra, int mb_skipped)
65 {
66     MpegEncContext *s = opaque;
67 
68     s->mv_dir     = mv_dir;
69     s->mv_type    = mv_type;
70     s->mb_intra   = mb_intra;
71     s->mb_skipped = mb_skipped;
72     s->mb_x       = mb_x;
73     s->mb_y       = mb_y;
74     s->mcsel      = 0;
75     memcpy(s->mv, mv, sizeof(*mv));
76 
77     ff_init_block_index(s);
78     ff_update_block_index(s);
79 
80     s->bdsp.clear_blocks(s->block[0]);
81     if (!s->chroma_y_shift)
82         s->bdsp.clear_blocks(s->block[6]);
83 
84     s->dest[0] = s->current_picture.f->data[0] +
85                  s->mb_y * 16 * s->linesize +
86                  s->mb_x * 16;
87     s->dest[1] = s->current_picture.f->data[1] +
88                  s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
89                  s->mb_x * (16 >> s->chroma_x_shift);
90     s->dest[2] = s->current_picture.f->data[2] +
91                  s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
92                  s->mb_x * (16 >> s->chroma_x_shift);
93 
94     if (ref)
95         av_log(s->avctx, AV_LOG_DEBUG,
96                "Interlaced error concealment is not fully implemented\n");
97     ff_mpv_reconstruct_mb(s, s->block);
98 }
99 
ff_mpeg_er_init(MpegEncContext * s)100 int ff_mpeg_er_init(MpegEncContext *s)
101 {
102     ERContext *er = &s->er;
103     int mb_array_size = s->mb_height * s->mb_stride;
104     int i;
105 
106     er->avctx       = s->avctx;
107 
108     er->mb_index2xy = s->mb_index2xy;
109     er->mb_num      = s->mb_num;
110     er->mb_width    = s->mb_width;
111     er->mb_height   = s->mb_height;
112     er->mb_stride   = s->mb_stride;
113     er->b8_stride   = s->b8_stride;
114 
115     er->er_temp_buffer     = av_malloc(s->mb_height * s->mb_stride * (4*sizeof(int) + 1));
116     er->error_status_table = av_mallocz(mb_array_size);
117     if (!er->er_temp_buffer || !er->error_status_table)
118         goto fail;
119 
120     er->mbskip_table  = s->mbskip_table;
121     er->mbintra_table = s->mbintra_table;
122 
123     for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
124         er->dc_val[i] = s->dc_val[i];
125 
126     er->decode_mb = mpeg_er_decode_mb;
127     er->opaque    = s;
128 
129     return 0;
130 fail:
131     av_freep(&er->er_temp_buffer);
132     av_freep(&er->error_status_table);
133     return AVERROR(ENOMEM);
134 }
135