aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/h261enc.c
blob: 91d90d8989d2aed40cc86fe898e547d511d0287b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
/*
 * H261 encoder
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 * Copyright (c) 2004 Maarten Daniels
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * H.261 encoder.
 */

#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h261.h"
#include "h261data.h"

extern uint8_t ff_h261_rl_table_store[2][2*MAX_RUN + MAX_LEVEL + 3];

static void h261_encode_block(H261Context * h, DCTELEM * block,
                              int n);

int ff_h261_get_picture_format(int width, int height){
    // QCIF
    if (width == 176 && height == 144)
        return 0;
    // CIF
    else if (width == 352 && height == 288)
        return 1;
    // ERROR
    else
        return -1;
}

void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number){
    H261Context * h = (H261Context *) s;
    int format, temp_ref;

    align_put_bits(&s->pb);

    /* Update the pointer to last GOB */
    s->ptr_lastgob = put_bits_ptr(&s->pb);

    put_bits(&s->pb, 20, 0x10); /* PSC */

    temp_ref= s->picture_number * (int64_t)30000 * s->avctx->time_base.num /
                         (1001 * (int64_t)s->avctx->time_base.den); //FIXME maybe this should use a timestamp
    put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */

    put_bits(&s->pb, 1, 0); /* split screen off */
    put_bits(&s->pb, 1, 0); /* camera  off */
    put_bits(&s->pb, 1, 0); /* freeze picture release off */

    format = ff_h261_get_picture_format(s->width, s->height);

    put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */

    put_bits(&s->pb, 1, 0); /* still image mode */
    put_bits(&s->pb, 1, 0); /* reserved */

    put_bits(&s->pb, 1, 0); /* no PEI */
    if(format == 0)
        h->gob_number = -1;
    else
        h->gob_number = 0;
    h->current_mba = 0;
}

/**
 * Encode a group of blocks header.
 */
static void h261_encode_gob_header(MpegEncContext * s, int mb_line){
    H261Context * h = (H261Context *)s;
    if(ff_h261_get_picture_format(s->width, s->height) == 0){
        h->gob_number+=2; // QCIF
    }
    else{
        h->gob_number++; // CIF
    }
    put_bits(&s->pb, 16, 1); /* GBSC */
    put_bits(&s->pb, 4, h->gob_number); /* GN */
    put_bits(&s->pb, 5, s->qscale); /* GQUANT */
    put_bits(&s->pb, 1, 0); /* no GEI */
    h->current_mba = 0;
    h->previous_mba = 0;
    h->current_mv_x=0;
    h->current_mv_y=0;
}

void ff_h261_reorder_mb_index(MpegEncContext* s){
    int index= s->mb_x + s->mb_y*s->mb_width;

    if(index % 33 == 0)
        h261_encode_gob_header(s,0);

    /* for CIF the GOB's are fragmented in the middle of a scanline
       that's why we need to adjust the x and y index of the macroblocks */
    if(ff_h261_get_picture_format(s->width,s->height) == 1){ // CIF
        s->mb_x =     index % 11 ; index /= 11;
        s->mb_y =     index %  3 ; index /=  3;
        s->mb_x+= 11*(index %  2); index /=  2;
        s->mb_y+=  3*index;

        ff_init_block_index(s);
        ff_update_block_index(s);
    }
}

static void h261_encode_motion(H261Context * h, int val){
    MpegEncContext * const s = &h->s;
    int sign, code;
    if(val==0){
        code = 0;
        put_bits(&s->pb,h261_mv_tab[code][1],h261_mv_tab[code][0]);
    }
    else{
        if(val > 15)
            val -=32;
        if(val < -16)
            val+=32;
        sign = val < 0;
        code = sign ? -val : val;
        put_bits(&s->pb,h261_mv_tab[code][1],h261_mv_tab[code][0]);
        put_bits(&s->pb,1,sign);
    }
}

static inline int get_cbp(MpegEncContext * s,
                      DCTELEM block[6][64])
{
    int i, cbp;
    cbp= 0;
    for (i = 0; i < 6; i++) {
        if (s->block_last_index[i] >= 0)
            cbp |= 1 << (5 - i);
    }
    return cbp;
}
void ff_h261_encode_mb(MpegEncContext * s,
         DCTELEM block[6][64],
         int motion_x, int motion_y)
{
    H261Context * h = (H261Context *)s;
    int mvd, mv_diff_x, mv_diff_y, i, cbp;
    cbp = 63; // avoid warning
    mvd = 0;

    h->current_mba++;
    h->mtype = 0;

    if (!s->mb_intra){
        /* compute cbp */
        cbp= get_cbp(s, block);

        /* mvd indicates if this block is motion compensated */
        mvd = motion_x | motion_y;

        if((cbp | mvd | s->dquant ) == 0) {
            /* skip macroblock */
            s->skip_count++;
            h->current_mv_x=0;
            h->current_mv_y=0;
            return;
        }
    }

    /* MB is not skipped, encode MBA */
    put_bits(&s->pb, h261_mba_bits[(h->current_mba-h->previous_mba)-1], h261_mba_code[(h->current_mba-h->previous_mba)-1]);

    /* calculate MTYPE */
    if(!s->mb_intra){
        h->mtype++;

        if(mvd || s->loop_filter)
            h->mtype+=3;
        if(s->loop_filter)
            h->mtype+=3;
        if(cbp || s->dquant)
            h->mtype++;
        assert(h->mtype > 1);
    }

    if(s->dquant)
        h->mtype++;

    put_bits(&s->pb, h261_mtype_bits[h->mtype], h261_mtype_code[h->mtype]);

    h->mtype = h261_mtype_map[h->mtype];

    if(IS_QUANT(h->mtype)){
        ff_set_qscale(s,s->qscale+s->dquant);
        put_bits(&s->pb, 5, s->qscale);
    }

    if(IS_16X16(h->mtype)){
        mv_diff_x = (motion_x >> 1) - h->current_mv_x;
        mv_diff_y = (motion_y >> 1) - h->current_mv_y;
        h->current_mv_x = (motion_x >> 1);
        h->current_mv_y = (motion_y >> 1);
        h261_encode_motion(h,mv_diff_x);
        h261_encode_motion(h,mv_diff_y);
    }

    h->previous_mba = h->current_mba;

    if(HAS_CBP(h->mtype)){
        assert(cbp>0);
        put_bits(&s->pb,h261_cbp_tab[cbp-1][1],h261_cbp_tab[cbp-1][0]);
    }
    for(i=0; i<6; i++) {
        /* encode each block */
        h261_encode_block(h, block[i], i);
    }

    if ( ( h->current_mba == 11 ) || ( h->current_mba == 22 ) || ( h->current_mba == 33 ) || ( !IS_16X16 ( h->mtype ) )){
        h->current_mv_x=0;
        h->current_mv_y=0;
    }
}

void ff_h261_encode_init(MpegEncContext *s){
    static int done = 0;

    if (!done) {
        done = 1;
        init_rl(&h261_rl_tcoeff, ff_h261_rl_table_store);
    }

    s->min_qcoeff= -127;
    s->max_qcoeff=  127;
    s->y_dc_scale_table=
    s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
}


/**
 * encodes a 8x8 block.
 * @param block the 8x8 block
 * @param n block index (0-3 are luma, 4-5 are chroma)
 */
static void h261_encode_block(H261Context * h, DCTELEM * block, int n){
    MpegEncContext * const s = &h->s;
    int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
    RLTable *rl;

    rl = &h261_rl_tcoeff;
    if (s->mb_intra) {
        /* DC coef */
        level = block[0];
        /* 255 cannot be represented, so we clamp */
        if (level > 254) {
            level = 254;
            block[0] = 254;
        }
        /* 0 cannot be represented also */
        else if (level < 1) {
            level = 1;
            block[0] = 1;
        }
        if (level == 128)
            put_bits(&s->pb, 8, 0xff);
        else
            put_bits(&s->pb, 8, level);
        i = 1;
    } else if((block[0]==1 || block[0] == -1) && (s->block_last_index[n] > -1)){
        //special case
        put_bits(&s->pb,2,block[0]>0 ? 2 : 3 );
        i = 1;
    } else {
        i = 0;
    }

    /* AC coefs */
    last_index = s->block_last_index[n];
    last_non_zero = i - 1;
    for (; i <= last_index; i++) {
        j = s->intra_scantable.permutated[i];
        level = block[j];
        if (level) {
            run = i - last_non_zero - 1;
            sign = 0;
            slevel = level;
            if (level < 0) {
                sign = 1;
                level = -level;
            }
            code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/, run, level);
            if(run==0 && level < 16)
            code+=1;
            put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
            if (code == rl->n) {
                put_bits(&s->pb, 6, run);
                assert(slevel != 0);
                assert(level <= 127);
                put_sbits(&s->pb, 8, slevel);
            } else {
                put_bits(&s->pb, 1, sign);
            }
            last_non_zero = i;
        }
    }
    if(last_index > -1){
        put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]);// END OF BLOCK
    }
}

AVCodec ff_h261_encoder = {
    .name           = "h261",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_H261,
    .priv_data_size = sizeof(H261Context),
    .init           = MPV_encode_init,
    .encode         = MPV_encode_picture,
    .close          = MPV_encode_end,
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
    .long_name= NULL_IF_CONFIG_SMALL("H.261"),
};