1/*
2 * Copyright (c) 2002 The FFmpeg Project
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include "avcodec.h"
22#include "dsputil.h"
23#include "mpegvideo.h"
24#include "msmpeg4.h"
25#include "msmpeg4data.h"
26#include "h263.h"
27#include "wmv2.h"
28
29
30static int encode_ext_header(Wmv2Context *w){
31    MpegEncContext * const s= &w->s;
32    PutBitContext pb;
33    int code;
34
35    init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
36
37    put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
38    put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
39
40    put_bits(&pb, 1, w->mspel_bit=1);
41    put_bits(&pb, 1, s->loop_filter);
42    put_bits(&pb, 1, w->abt_flag=1);
43    put_bits(&pb, 1, w->j_type_bit=1);
44    put_bits(&pb, 1, w->top_left_mv_flag=0);
45    put_bits(&pb, 1, w->per_mb_rl_bit=1);
46    put_bits(&pb, 3, code=1);
47
48    flush_put_bits(&pb);
49
50    s->slice_height = s->mb_height / code;
51
52    return 0;
53}
54
55static av_cold int wmv2_encode_init(AVCodecContext *avctx){
56    Wmv2Context * const w= avctx->priv_data;
57
58    if(MPV_encode_init(avctx) < 0)
59        return -1;
60
61    ff_wmv2_common_init(w);
62
63    avctx->extradata_size= 4;
64    avctx->extradata= av_mallocz(avctx->extradata_size + 10);
65    encode_ext_header(w);
66
67    return 0;
68}
69
70int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
71{
72    Wmv2Context * const w= (Wmv2Context*)s;
73
74    put_bits(&s->pb, 1, s->pict_type - 1);
75    if(s->pict_type == FF_I_TYPE){
76        put_bits(&s->pb, 7, 0);
77    }
78    put_bits(&s->pb, 5, s->qscale);
79
80    s->dc_table_index = 1;
81    s->mv_table_index = 1; /* only if P frame */
82    s->per_mb_rl_table = 0;
83    s->mspel= 0;
84    w->per_mb_abt=0;
85    w->abt_type=0;
86    w->j_type=0;
87
88    assert(s->flipflop_rounding);
89
90    if (s->pict_type == FF_I_TYPE) {
91        assert(s->no_rounding==1);
92        if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
93
94        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
95
96        if(!s->per_mb_rl_table){
97            ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
98            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
99        }
100
101        put_bits(&s->pb, 1, s->dc_table_index);
102
103        s->inter_intra_pred= 0;
104    }else{
105        int cbp_index;
106
107        put_bits(&s->pb, 2, SKIP_TYPE_NONE);
108
109        ff_msmpeg4_code012(&s->pb, cbp_index=0);
110        if(s->qscale <= 10){
111            int map[3]= {0,2,1};
112            w->cbp_table_index= map[cbp_index];
113        }else if(s->qscale <= 20){
114            int map[3]= {1,0,2};
115            w->cbp_table_index= map[cbp_index];
116        }else{
117            int map[3]= {2,1,0};
118            w->cbp_table_index= map[cbp_index];
119        }
120
121        if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
122
123        if(w->abt_flag){
124            put_bits(&s->pb, 1, w->per_mb_abt^1);
125            if(!w->per_mb_abt){
126                ff_msmpeg4_code012(&s->pb, w->abt_type);
127            }
128        }
129
130        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
131
132        if(!s->per_mb_rl_table){
133            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
134            s->rl_chroma_table_index = s->rl_table_index;
135        }
136        put_bits(&s->pb, 1, s->dc_table_index);
137        put_bits(&s->pb, 1, s->mv_table_index);
138
139        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
140    }
141    s->esc3_level_length= 0;
142    s->esc3_run_length= 0;
143
144    return 0;
145}
146
147/* Nearly identical to wmv1 but that is just because we do not use the
148 * useless M$ crap features. It is duplicated here in case someone wants
149 * to add support for these crap features. */
150void ff_wmv2_encode_mb(MpegEncContext * s,
151                       DCTELEM block[6][64],
152                       int motion_x, int motion_y)
153{
154    Wmv2Context * const w= (Wmv2Context*)s;
155    int cbp, coded_cbp, i;
156    int pred_x, pred_y;
157    uint8_t *coded_block;
158
159    ff_msmpeg4_handle_slices(s);
160
161    if (!s->mb_intra) {
162        /* compute cbp */
163        cbp = 0;
164        for (i = 0; i < 6; i++) {
165            if (s->block_last_index[i] >= 0)
166                cbp |= 1 << (5 - i);
167        }
168
169        put_bits(&s->pb,
170                 wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
171                 wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
172
173        /* motion vector */
174        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
175        ff_msmpeg4_encode_motion(s, motion_x - pred_x,
176                              motion_y - pred_y);
177    } else {
178        /* compute cbp */
179        cbp = 0;
180        coded_cbp = 0;
181        for (i = 0; i < 6; i++) {
182            int val, pred;
183            val = (s->block_last_index[i] >= 1);
184            cbp |= val << (5 - i);
185            if (i < 4) {
186                /* predict value for close blocks only for luma */
187                pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
188                *coded_block = val;
189                val = val ^ pred;
190            }
191            coded_cbp |= val << (5 - i);
192        }
193
194        if (s->pict_type == FF_I_TYPE) {
195            put_bits(&s->pb,
196                     ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
197        } else {
198            put_bits(&s->pb,
199                     wmv2_inter_table[w->cbp_table_index][cbp][1],
200                     wmv2_inter_table[w->cbp_table_index][cbp][0]);
201        }
202        put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
203        if(s->inter_intra_pred){
204            s->h263_aic_dir=0;
205            put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
206        }
207    }
208
209    for (i = 0; i < 6; i++) {
210        ff_msmpeg4_encode_block(s, block[i], i);
211    }
212}
213
214AVCodec wmv2_encoder = {
215    "wmv2",
216    AVMEDIA_TYPE_VIDEO,
217    CODEC_ID_WMV2,
218    sizeof(Wmv2Context),
219    wmv2_encode_init,
220    MPV_encode_picture,
221    MPV_encode_end,
222    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
223    .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
224};
225