Statistics
| Branch: | Revision:

ffmpeg / libavcodec / jpeglsenc.c @ 755bfeab

History | View | Annotate | Download (11.9 KB)

1
/*
2
 * JPEG-LS encoder
3
 * Copyright (c) 2003 Michael Niedermayer
4
 * Copyright (c) 2006 Konstantin Shishkov
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
/**
24
 * @file jpeglsenc.c
25
 * JPEG-LS encoder.
26
 */
27

    
28
#include "avcodec.h"
29
#include "bitstream.h"
30
#include "golomb.h"
31
#include "dsputil.h"
32
#include "mjpeg.h"
33
#include "jpegls.h"
34

    
35

    
36
/**
37
 * Encode error from regular symbol
38
 */
39
static inline void ls_encode_regular(JLSState *state, PutBitContext *pb, int Q, int err){
40
    int k;
41
    int val;
42
    int map;
43

    
44
    for(k = 0; (state->N[Q] << k) < state->A[Q]; k++);
45

    
46
    map = !state->near && !k && (2 * state->B[Q] <= -state->N[Q]);
47

    
48
    if(err < 0)
49
        err += state->range;
50
    if(err >= ((state->range + 1) >> 1)) {
51
        err -= state->range;
52
        val = 2 * FFABS(err) - 1 - map;
53
    } else
54
        val = 2 * err + map;
55

    
56
    set_ur_golomb_jpegls(pb, val, k, state->limit, state->qbpp);
57

    
58
    ff_jpegls_update_state_regular(state, Q, err);
59
}
60

    
61
/**
62
 * Encode error from run termination
63
 */
64
static inline void ls_encode_runterm(JLSState *state, PutBitContext *pb, int RItype, int err, int limit_add){
65
    int k;
66
    int val, map;
67
    int Q = 365 + RItype;
68
    int temp;
69

    
70
    temp = state->A[Q];
71
    if(RItype)
72
        temp += state->N[Q] >> 1;
73
    for(k = 0; (state->N[Q] << k) < temp; k++);
74
    map = 0;
75
    if(!k && err && (2 * state->B[Q] < state->N[Q]))
76
        map = 1;
77

    
78
    if(err < 0)
79
        val = - (2 * err) - 1 - RItype + map;
80
    else
81
        val = 2 * err - RItype - map;
82
    set_ur_golomb_jpegls(pb, val, k, state->limit - limit_add - 1, state->qbpp);
83

    
84
    if(err < 0)
85
        state->B[Q]++;
86
    state->A[Q] += (val + 1 - RItype) >> 1;
87

    
88
    ff_jpegls_downscale_state(state, Q);
89
}
90

    
91
/**
92
 * Encode run value as specified by JPEG-LS standard
93
 */
94
static inline void ls_encode_run(JLSState *state, PutBitContext *pb, int run, int comp, int trail){
95
    while(run >= (1 << ff_log2_run[state->run_index[comp]])){
96
        put_bits(pb, 1, 1);
97
        run -= 1 << ff_log2_run[state->run_index[comp]];
98
        if(state->run_index[comp] < 31)
99
            state->run_index[comp]++;
100
    }
101
    /* if hit EOL, encode another full run, else encode aborted run */
102
    if(!trail && run) {
103
        put_bits(pb, 1, 1);
104
    }else if(trail){
105
        put_bits(pb, 1, 0);
106
        if(ff_log2_run[state->run_index[comp]])
107
            put_bits(pb, ff_log2_run[state->run_index[comp]], run);
108
    }
109
}
110

    
111
/**
112
 * Encode one line of image
113
 */
114
static inline void ls_encode_line(JLSState *state, PutBitContext *pb, void *last, void *cur, int last2, int w, int stride, int comp, int bits){
115
    int x = 0;
116
    int Ra, Rb, Rc, Rd;
117
    int D0, D1, D2;
118

    
119
    while(x < w) {
120
        int err, pred, sign;
121

    
122
        /* compute gradients */
123
        Ra = x ? R(cur, x - stride) : R(last, x);
124
        Rb = R(last, x);
125
        Rc = x ? R(last, x - stride) : last2;
126
        Rd = (x >= w - stride) ? R(last, x) : R(last, x + stride);
127
        D0 = Rd - Rb;
128
        D1 = Rb - Rc;
129
        D2 = Rc - Ra;
130

    
131
        /* run mode */
132
        if((FFABS(D0) <= state->near) && (FFABS(D1) <= state->near) && (FFABS(D2) <= state->near)) {
133
            int RUNval, RItype, run;
134

    
135
            run = 0;
136
            RUNval = Ra;
137
            while(x < w && (FFABS(R(cur, x) - RUNval) <= state->near)){
138
                run++;
139
                W(cur, x, Ra);
140
                x += stride;
141
            }
142
            ls_encode_run(state, pb, run, comp, x < w);
143
            if(x >= w)
144
                return;
145
            Rb = R(last, x);
146
            RItype = (FFABS(Ra - Rb) <= state->near);
147
            pred = RItype ? Ra : Rb;
148
            err = R(cur, x) - pred;
149

    
150
            if(!RItype && Ra > Rb)
151
                err = -err;
152

    
153
            if(state->near){
154
                if(err > 0)
155
                    err = (state->near + err) / state->twonear;
156
                else
157
                    err = -(state->near - err) / state->twonear;
158

    
159
                if(RItype || (Rb >= Ra))
160
                    Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
161
                else
162
                    Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
163
                W(cur, x, Ra);
164
            }
165
            if(err < 0)
166
                err += state->range;
167
            if(err >= ((state->range + 1) >> 1))
168
                err -= state->range;
169

    
170
            ls_encode_runterm(state, pb, RItype, err, ff_log2_run[state->run_index[comp]]);
171

    
172
            if(state->run_index[comp] > 0)
173
                state->run_index[comp]--;
174
        } else { /* regular mode */
175
            int context;
176

    
177
            context = ff_jpegls_quantize(state, D0) * 81 + ff_jpegls_quantize(state, D1) * 9 + ff_jpegls_quantize(state, D2);
178
            pred = mid_pred(Ra, Ra + Rb - Rc, Rb);
179

    
180
            if(context < 0){
181
                context = -context;
182
                sign = 1;
183
                pred = av_clip(pred - state->C[context], 0, state->maxval);
184
                err = pred - R(cur, x);
185
            }else{
186
                sign = 0;
187
                pred = av_clip(pred + state->C[context], 0, state->maxval);
188
                err = R(cur, x) - pred;
189
            }
190

    
191
            if(state->near){
192
                if(err > 0)
193
                    err = (state->near + err) / state->twonear;
194
                else
195
                    err = -(state->near - err) / state->twonear;
196
                if(!sign)
197
                    Ra = av_clip(pred + err * state->twonear, 0, state->maxval);
198
                else
199
                    Ra = av_clip(pred - err * state->twonear, 0, state->maxval);
200
                W(cur, x, Ra);
201
            }
202

    
203
            ls_encode_regular(state, pb, context, err);
204
        }
205
        x += stride;
206
    }
207
}
208

    
209
static void ls_store_lse(JLSState *state, PutBitContext *pb){
210
    /* Test if we have default params and don't need to store LSE */
211
    JLSState state2;
212
    memset(&state2, 0, sizeof(JLSState));
213
    state2.bpp = state->bpp;
214
    state2.near = state->near;
215
    ff_jpegls_reset_coding_parameters(&state2, 1);
216
    if(state->T1 == state2.T1 && state->T2 == state2.T2 && state->T3 == state2.T3 && state->reset == state2.reset)
217
        return;
218
    /* store LSE type 1 */
219
    put_marker(pb, LSE);
220
    put_bits(pb, 16, 13);
221
    put_bits(pb, 8,   1);
222
    put_bits(pb, 16, state->maxval);
223
    put_bits(pb, 16, state->T1);
224
    put_bits(pb, 16, state->T2);
225
    put_bits(pb, 16, state->T3);
226
    put_bits(pb, 16, state->reset);
227
}
228

    
229
static int encode_picture_ls(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
230
    JpeglsContext * const s = avctx->priv_data;
231
    AVFrame *pict = data;
232
    AVFrame * const p= (AVFrame*)&s->picture;
233
    const int near = avctx->prediction_method;
234
    PutBitContext pb, pb2;
235
    GetBitContext gb;
236
    uint8_t *buf2, *zero, *cur, *last;
237
    JLSState *state;
238
    int i, size;
239
    int comps;
240

    
241
    buf2 = av_malloc(buf_size);
242

    
243
    init_put_bits(&pb, buf, buf_size);
244
    init_put_bits(&pb2, buf2, buf_size);
245

    
246
    *p = *pict;
247
    p->pict_type= FF_I_TYPE;
248
    p->key_frame= 1;
249

    
250
    if(avctx->pix_fmt == PIX_FMT_GRAY8 || avctx->pix_fmt == PIX_FMT_GRAY16)
251
        comps = 1;
252
    else
253
        comps = 3;
254

    
255
    /* write our own JPEG header, can't use mjpeg_picture_header */
256
    put_marker(&pb, SOI);
257
    put_marker(&pb, SOF48);
258
    put_bits(&pb, 16, 8 + comps * 3); // header size depends on components
259
    put_bits(&pb,  8, (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8); // bpp
260
    put_bits(&pb, 16, avctx->height);
261
    put_bits(&pb, 16, avctx->width);
262
    put_bits(&pb,  8, comps);         // components
263
    for(i = 1; i <= comps; i++) {
264
        put_bits(&pb,  8, i);    // component ID
265
        put_bits(&pb,  8, 0x11); // subsampling: none
266
        put_bits(&pb,  8, 0);    // Tiq, used by JPEG-LS ext
267
    }
268

    
269
    put_marker(&pb, SOS);
270
    put_bits(&pb, 16, 6 + comps * 2);
271
    put_bits(&pb,  8, comps);
272
    for(i = 1; i <= comps; i++) {
273
        put_bits(&pb,  8, i);  // component ID
274
        put_bits(&pb,  8, 0);  // mapping index: none
275
    }
276
    put_bits(&pb,  8, near);
277
    put_bits(&pb,  8, (comps > 1) ? 1 : 0); // interleaving: 0 - plane, 1 - line
278
    put_bits(&pb,  8, 0); // point transform: none
279

    
280
    state = av_mallocz(sizeof(JLSState));
281
    /* initialize JPEG-LS state from JPEG parameters */
282
    state->near = near;
283
    state->bpp = (avctx->pix_fmt == PIX_FMT_GRAY16) ? 16 : 8;
284
    ff_jpegls_reset_coding_parameters(state, 0);
285
    ff_jpegls_init_state(state);
286

    
287
    ls_store_lse(state, &pb);
288

    
289
    zero = av_mallocz(p->linesize[0]);
290
    last = zero;
291
    cur = p->data[0];
292
    if(avctx->pix_fmt == PIX_FMT_GRAY8){
293
        int t = 0;
294

    
295
        for(i = 0; i < avctx->height; i++) {
296
            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0,  8);
297
            t = last[0];
298
            last = cur;
299
            cur += p->linesize[0];
300
        }
301
    }else if(avctx->pix_fmt == PIX_FMT_GRAY16){
302
        int t = 0;
303

    
304
        for(i = 0; i < avctx->height; i++) {
305
            ls_encode_line(state, &pb2, last, cur, t, avctx->width, 1, 0, 16);
306
            t = *((uint16_t*)last);
307
            last = cur;
308
            cur += p->linesize[0];
309
        }
310
    }else if(avctx->pix_fmt == PIX_FMT_RGB24){
311
        int j, width;
312
        int Rc[3] = {0, 0, 0};
313

    
314
        width = avctx->width * 3;
315
        for(i = 0; i < avctx->height; i++) {
316
            for(j = 0; j < 3; j++) {
317
                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
318
                Rc[j] = last[j];
319
            }
320
            last = cur;
321
            cur += s->picture.linesize[0];
322
        }
323
    }else if(avctx->pix_fmt == PIX_FMT_BGR24){
324
        int j, width;
325
        int Rc[3] = {0, 0, 0};
326

    
327
        width = avctx->width * 3;
328
        for(i = 0; i < avctx->height; i++) {
329
            for(j = 2; j >= 0; j--) {
330
                ls_encode_line(state, &pb2, last + j, cur + j, Rc[j], width, 3, j, 8);
331
                Rc[j] = last[j];
332
            }
333
            last = cur;
334
            cur += s->picture.linesize[0];
335
        }
336
    }
337

    
338
    av_free(zero);
339
    av_free(state);
340

    
341
    // the specification says that after doing 0xff escaping unused bits in the
342
    // last byte must be set to 0, so just append 7 "optional" zero-bits to
343
    // avoid special-casing.
344
    put_bits(&pb2, 7, 0);
345
    size = put_bits_count(&pb2);
346
    flush_put_bits(&pb2);
347
    /* do escape coding */
348
    init_get_bits(&gb, buf2, size);
349
    size -= 7;
350
    while(get_bits_count(&gb) < size){
351
        int v;
352
        v = get_bits(&gb, 8);
353
        put_bits(&pb, 8, v);
354
        if(v == 0xFF){
355
            v = get_bits(&gb, 7);
356
            put_bits(&pb, 8, v);
357
        }
358
    }
359
    align_put_bits(&pb);
360
    av_free(buf2);
361

    
362
    /* End of image */
363
    put_marker(&pb, EOI);
364
    flush_put_bits(&pb);
365

    
366
    emms_c();
367

    
368
    return put_bits_count(&pb) >> 3;
369
}
370

    
371
static int encode_init_ls(AVCodecContext *ctx) {
372
    JpeglsContext *c = (JpeglsContext*)ctx->priv_data;
373

    
374
    c->avctx = ctx;
375
    ctx->coded_frame = &c->picture;
376

    
377
    if(ctx->pix_fmt != PIX_FMT_GRAY8 && ctx->pix_fmt != PIX_FMT_GRAY16 && ctx->pix_fmt != PIX_FMT_RGB24 && ctx->pix_fmt != PIX_FMT_BGR24){
378
        av_log(ctx, AV_LOG_ERROR, "Only grayscale and RGB24/BGR24 images are supported\n");
379
        return -1;
380
    }
381
    return 0;
382
}
383

    
384
AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
385
    "jpegls",
386
    CODEC_TYPE_VIDEO,
387
    CODEC_ID_JPEGLS,
388
    sizeof(JpeglsContext),
389
    encode_init_ls,
390
    encode_picture_ls,
391
    NULL,
392
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, -1},
393
};