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 "wmv2.h"
27
28
29static int encode_ext_header(Wmv2Context *w){
30    MpegEncContext * const s= &w->s;
31    PutBitContext pb;
32    int code;
33
34    init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
35
36    put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
37    put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
38
39    put_bits(&pb, 1, w->mspel_bit=1);
40    put_bits(&pb, 1, s->loop_filter);
41    put_bits(&pb, 1, w->abt_flag=1);
42    put_bits(&pb, 1, w->j_type_bit=1);
43    put_bits(&pb, 1, w->top_left_mv_flag=0);
44    put_bits(&pb, 1, w->per_mb_rl_bit=1);
45    put_bits(&pb, 3, code=1);
46
47    flush_put_bits(&pb);
48
49    s->slice_height = s->mb_height / code;
50
51    return 0;
52}
53
54static av_cold int wmv2_encode_init(AVCodecContext *avctx){
55    Wmv2Context * const w= avctx->priv_data;
56
57    if(MPV_encode_init(avctx) < 0)
58        return -1;
59
60    ff_wmv2_common_init(w);
61
62    avctx->extradata_size= 4;
63    avctx->extradata= av_mallocz(avctx->extradata_size + 10);
64    encode_ext_header(w);
65
66    return 0;
67}
68
69#if 0 /* unused, remove? */
70static av_cold int wmv2_encode_end(AVCodecContext *avctx){
71
72    if(MPV_encode_end(avctx) < 0)
73        return -1;
74
75    avctx->extradata_size= 0;
76    av_freep(&avctx->extradata);
77
78    return 0;
79}
80#endif
81
82int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
83{
84    Wmv2Context * const w= (Wmv2Context*)s;
85
86    put_bits(&s->pb, 1, s->pict_type - 1);
87    if(s->pict_type == FF_I_TYPE){
88        put_bits(&s->pb, 7, 0);
89    }
90    put_bits(&s->pb, 5, s->qscale);
91
92    s->dc_table_index = 1;
93    s->mv_table_index = 1; /* only if P frame */
94//    s->use_skip_mb_code = 1; /* only if P frame */
95    s->per_mb_rl_table = 0;
96    s->mspel= 0;
97    w->per_mb_abt=0;
98    w->abt_type=0;
99    w->j_type=0;
100
101    assert(s->flipflop_rounding);
102
103    if (s->pict_type == FF_I_TYPE) {
104        assert(s->no_rounding==1);
105        if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
106
107        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
108
109        if(!s->per_mb_rl_table){
110            ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
111            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
112        }
113
114        put_bits(&s->pb, 1, s->dc_table_index);
115
116        s->inter_intra_pred= 0;
117    }else{
118        int cbp_index;
119
120        put_bits(&s->pb, 2, SKIP_TYPE_NONE);
121
122        ff_msmpeg4_code012(&s->pb, cbp_index=0);
123        if(s->qscale <= 10){
124            int map[3]= {0,2,1};
125            w->cbp_table_index= map[cbp_index];
126        }else if(s->qscale <= 20){
127            int map[3]= {1,0,2};
128            w->cbp_table_index= map[cbp_index];
129        }else{
130            int map[3]= {2,1,0};
131            w->cbp_table_index= map[cbp_index];
132        }
133
134        if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
135
136        if(w->abt_flag){
137            put_bits(&s->pb, 1, w->per_mb_abt^1);
138            if(!w->per_mb_abt){
139                ff_msmpeg4_code012(&s->pb, w->abt_type);
140            }
141        }
142
143        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
144
145        if(!s->per_mb_rl_table){
146            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
147            s->rl_chroma_table_index = s->rl_table_index;
148        }
149        put_bits(&s->pb, 1, s->dc_table_index);
150        put_bits(&s->pb, 1, s->mv_table_index);
151
152        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
153    }
154    s->esc3_level_length= 0;
155    s->esc3_run_length= 0;
156
157    return 0;
158}
159
160/* Nearly identical to wmv1 but that is just because we do not use the
161 * useless M$ crap features. It is duplicated here in case someone wants
162 * to add support for these crap features. */
163void ff_wmv2_encode_mb(MpegEncContext * s,
164                       DCTELEM block[6][64],
165                       int motion_x, int motion_y)
166{
167    Wmv2Context * const w= (Wmv2Context*)s;
168    int cbp, coded_cbp, i;
169    int pred_x, pred_y;
170    uint8_t *coded_block;
171
172    ff_msmpeg4_handle_slices(s);
173
174    if (!s->mb_intra) {
175        /* compute cbp */
176        cbp = 0;
177        for (i = 0; i < 6; i++) {
178            if (s->block_last_index[i] >= 0)
179                cbp |= 1 << (5 - i);
180        }
181
182        put_bits(&s->pb,
183                 wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
184                 wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
185
186        /* motion vector */
187        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
188        ff_msmpeg4_encode_motion(s, motion_x - pred_x,
189                              motion_y - pred_y);
190    } else {
191        /* compute cbp */
192        cbp = 0;
193        coded_cbp = 0;
194        for (i = 0; i < 6; i++) {
195            int val, pred;
196            val = (s->block_last_index[i] >= 1);
197            cbp |= val << (5 - i);
198            if (i < 4) {
199                /* predict value for close blocks only for luma */
200                pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
201                *coded_block = val;
202                val = val ^ pred;
203            }
204            coded_cbp |= val << (5 - i);
205        }
206#if 0
207        if (coded_cbp)
208            printf("cbp=%x %x\n", cbp, coded_cbp);
209#endif
210
211        if (s->pict_type == FF_I_TYPE) {
212            put_bits(&s->pb,
213                     ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
214        } else {
215            put_bits(&s->pb,
216                     wmv2_inter_table[w->cbp_table_index][cbp][1],
217                     wmv2_inter_table[w->cbp_table_index][cbp][0]);
218        }
219        put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
220        if(s->inter_intra_pred){
221            s->h263_aic_dir=0;
222            put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
223        }
224    }
225
226    for (i = 0; i < 6; i++) {
227        ff_msmpeg4_encode_block(s, block[i], i);
228    }
229}
230
231AVCodec wmv2_encoder = {
232    "wmv2",
233    CODEC_TYPE_VIDEO,
234    CODEC_ID_WMV2,
235    sizeof(Wmv2Context),
236    wmv2_encode_init,
237    MPV_encode_picture,
238    MPV_encode_end,
239    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
240    .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
241};
242