GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/motionpixels.c Lines: 167 188 88.8 %
Date: 2021-04-20 15:25:36 Branches: 76 98 77.6 %

Line Branch Exec Source
1
/*
2
 * Motion Pixels Video Decoder
3
 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
#include "libavutil/thread.h"
23
24
#include "config.h"
25
26
#include "avcodec.h"
27
#include "get_bits.h"
28
#include "bswapdsp.h"
29
#include "internal.h"
30
31
#define MAX_HUFF_CODES 16
32
33
#include "motionpixels_tablegen.h"
34
35
typedef struct HuffCode {
36
    uint8_t size;
37
    uint8_t delta;
38
} HuffCode;
39
40
typedef struct MotionPixelsContext {
41
    AVCodecContext *avctx;
42
    AVFrame *frame;
43
    BswapDSPContext bdsp;
44
    uint8_t *changes_map;
45
    int offset_bits_len;
46
    int codes_count, current_codes_count;
47
    int max_codes_bits;
48
    HuffCode codes[MAX_HUFF_CODES];
49
    VLC vlc;
50
    YuvPixel *vpt, *hpt;
51
    uint8_t gradient_scale[3];
52
    uint8_t *bswapbuf;
53
    int bswapbuf_size;
54
} MotionPixelsContext;
55
56
2
static av_cold int mp_decode_end(AVCodecContext *avctx)
57
{
58
2
    MotionPixelsContext *mp = avctx->priv_data;
59
60
2
    av_freep(&mp->changes_map);
61
2
    av_freep(&mp->vpt);
62
2
    av_freep(&mp->hpt);
63
2
    av_freep(&mp->bswapbuf);
64
2
    av_frame_free(&mp->frame);
65
66
2
    return 0;
67
}
68
69
2
static av_cold int mp_decode_init(AVCodecContext *avctx)
70
{
71
    av_unused static AVOnce init_static_once = AV_ONCE_INIT;
72
2
    MotionPixelsContext *mp = avctx->priv_data;
73
2
    int w4 = (avctx->width  + 3) & ~3;
74
2
    int h4 = (avctx->height + 3) & ~3;
75
76
2
    if(avctx->extradata_size < 2){
77
        av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
78
        return AVERROR_INVALIDDATA;
79
    }
80
81
2
    mp->avctx = avctx;
82
2
    ff_bswapdsp_init(&mp->bdsp);
83
2
    mp->changes_map = av_mallocz_array(avctx->width, h4);
84
2
    mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
85
2
    mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
86
2
    mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
87

2
    if (!mp->changes_map || !mp->vpt || !mp->hpt)
88
        return AVERROR(ENOMEM);
89
2
    avctx->pix_fmt = AV_PIX_FMT_RGB555;
90
91
2
    mp->frame = av_frame_alloc();
92
2
    if (!mp->frame)
93
        return AVERROR(ENOMEM);
94
95
#if !CONFIG_HARDCODED_TABLES
96
2
    ff_thread_once(&init_static_once, motionpixels_tableinit);
97
#endif
98
99
2
    return 0;
100
}
101
102
444
static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
103
{
104
    uint16_t *pixels;
105
444
    int offset, w, h, color = 0, x, y, i;
106
107
27419
    while (count--) {
108
26975
        offset = get_bits_long(gb, mp->offset_bits_len);
109
26975
        w      = get_bits(gb, bits_len) + 1;
110
26975
        h      = get_bits(gb, bits_len) + 1;
111
26975
        if (read_color)
112
16095
            color = get_bits(gb, 15);
113
26975
        x = offset % mp->avctx->width;
114
26975
        y = offset / mp->avctx->width;
115
26975
        if (y >= mp->avctx->height)
116
            continue;
117
26975
        w = FFMIN(w, mp->avctx->width  - x);
118
26975
        h = FFMIN(h, mp->avctx->height - y);
119
26975
        pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
120
325261
        while (h--) {
121
298286
            mp->changes_map[offset] = w;
122
298286
            if (read_color)
123
1832851
                for (i = 0; i < w; ++i)
124
1646821
                    pixels[i] = color;
125
298286
            offset += mp->avctx->width;
126
298286
            pixels += mp->frame->linesize[0] / 2;
127
        }
128
    }
129
444
}
130
131
1651
static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size)
132
{
133
3191
    while (get_bits1(gb)) {
134
1540
        ++size;
135
1540
        if (size > mp->max_codes_bits) {
136
            av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
137
            return AVERROR_INVALIDDATA;
138
        }
139
1540
        if (mp_get_code(mp, gb, size) < 0)
140
            return AVERROR_INVALIDDATA;
141
    }
142
1651
    if (mp->current_codes_count >= mp->codes_count) {
143
        av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
144
        return AVERROR_INVALIDDATA;
145
    }
146
147
1651
    mp->codes[mp->current_codes_count++].size = size;
148
1651
    return 0;
149
}
150
151
111
static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
152
{
153
111
    if (mp->codes_count == 1) {
154
        mp->codes[0].delta = get_bits(gb, 4);
155
    } else {
156
        int i;
157
        int ret;
158
159
111
        mp->max_codes_bits = get_bits(gb, 4);
160
1762
        for (i = 0; i < mp->codes_count; ++i)
161
1651
            mp->codes[i].delta = get_bits(gb, 4);
162
111
        mp->current_codes_count = 0;
163
111
        if ((ret = mp_get_code(mp, gb, 0)) < 0)
164
            return ret;
165
111
        if (mp->current_codes_count < mp->codes_count) {
166
            av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
167
            return AVERROR_INVALIDDATA;
168
        }
169
   }
170
111
   return 0;
171
}
172
173
6395631
static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
174
{
175
    int delta;
176
177
6395631
    delta = (v - 7) * mp->gradient_scale[component];
178

6395631
    mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
179
6395631
    return delta;
180
}
181
182
340991
static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
183
{
184
    int color;
185
186
340991
    color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
187
340991
    return mp_rgb_yuv_table[color];
188
}
189
190
5666143
static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
191
{
192
    int color;
193
194
5666143
    color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
195
5666143
    *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
196
5666143
}
197
198
6395631
static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
199
{
200
6395631
    return mp->vlc.table ? get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1)
201
12791262
                         : mp->codes[0].delta;
202
}
203
204
26640
static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
205
{
206
    YuvPixel p;
207
26640
    const int y0 = y * mp->avctx->width;
208
26640
    int w, i, x = 0;
209
210
26640
    p = mp->vpt[y];
211
26640
    if (mp->changes_map[y0 + x] == 0) {
212
18532
        memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
213
18532
        ++x;
214
    }
215
5972637
    while (x < mp->avctx->width) {
216
5945997
        w = mp->changes_map[y0 + x];
217
5945997
        if (w != 0) {
218
298386
            if ((y & 3) == 0) {
219
73166
                if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
220
69448
                    mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
221
65081
                    mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
222
47814
                    for (i = (x + 3) & ~3; i < x + w; i += 4) {
223
34497
                        mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
224
                    }
225
                }
226
            }
227
298386
            x += w;
228
298386
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
229
298386
            p = mp_get_yuv_from_rgb(mp, x - 1, y);
230
        } else {
231
5647611
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
232
5647611
            p.y = av_clip_uintp2(p.y, 5);
233
5647611
            if ((x & 3) == 0) {
234
1417461
                if ((y & 3) == 0) {
235
360154
                    p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
236
360154
                    p.v = av_clip_intp2(p.v, 5);
237
360154
                    p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
238
360154
                    p.u = av_clip_intp2(p.u, 5);
239
360154
                    mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
240
                } else {
241
1057307
                    p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
242
1057307
                    p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
243
                }
244
            }
245
5647611
            mp_set_rgb_from_yuv(mp, x, y, &p);
246
5647611
            ++x;
247
        }
248
    }
249
26640
}
250
251
111
static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
252
{
253
    YuvPixel p;
254
    int y, y0;
255
256
    av_assert1(mp->changes_map[0]);
257
258
26751
    for (y = 0; y < mp->avctx->height; ++y) {
259
26640
        if (mp->changes_map[y * mp->avctx->width] != 0) {
260
8108
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
261
8108
            p = mp_get_yuv_from_rgb(mp, 0, y);
262
        } else {
263
18532
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
264
18532
            p.y = av_clip_uintp2(p.y, 5);
265
18532
            if ((y & 3) == 0) {
266
4590
                p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
267
4590
                p.v = av_clip_intp2(p.v, 5);
268
4590
                p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
269
4590
                p.u = av_clip_intp2(p.u, 5);
270
            }
271
18532
            mp->vpt[y] = p;
272
18532
            mp_set_rgb_from_yuv(mp, 0, y, &p);
273
        }
274
    }
275
333
    for (y0 = 0; y0 < 2; ++y0)
276
26862
        for (y = y0; y < mp->avctx->height; y += 2)
277
26640
            mp_decode_line(mp, gb, y);
278
111
}
279
280
111
static int mp_decode_frame(AVCodecContext *avctx,
281
                                 void *data, int *got_frame,
282
                                 AVPacket *avpkt)
283
{
284
111
    const uint8_t *buf = avpkt->data;
285
111
    int buf_size = avpkt->size;
286
111
    MotionPixelsContext *mp = avctx->priv_data;
287
    GetBitContext gb;
288
    int i, count1, count2, sz, ret;
289
290
111
    if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
291
        return ret;
292
293
    /* le32 bitstream msb first */
294
111
    av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
295
111
    if (!mp->bswapbuf)
296
        return AVERROR(ENOMEM);
297
111
    mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
298
                       buf_size / 4);
299
111
    if (buf_size & 3)
300
87
        memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
301
111
    init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
302
303
111
    memset(mp->changes_map, 0, avctx->width * avctx->height);
304
333
    for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
305
222
        count1 = get_bits(&gb, 12);
306
222
        count2 = get_bits(&gb, 12);
307
222
        mp_read_changes_map(mp, &gb, count1, 8, i);
308
222
        mp_read_changes_map(mp, &gb, count2, 4, i);
309
    }
310
311
111
    mp->codes_count = get_bits(&gb, 4);
312
111
    if (mp->codes_count == 0)
313
        goto end;
314
315
111
    if (mp->changes_map[0] == 0) {
316
100
        *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
317
100
        mp->changes_map[0] = 1;
318
    }
319
111
    if (mp_read_codes_table(mp, &gb) < 0)
320
        goto end;
321
322
111
    sz = get_bits(&gb, 18);
323
111
    if (avctx->extradata[0] != 5)
324
111
        sz += get_bits(&gb, 18);
325
111
    if (sz == 0)
326
        goto end;
327
328
111
    if (mp->codes_count > 1) {
329
        /* The entries of the mp->codes array are sorted from right to left
330
         * in the Huffman tree, hence -(int)sizeof(HuffCode). */
331
111
        ret = ff_init_vlc_from_lengths(&mp->vlc, mp->max_codes_bits, mp->codes_count,
332
111
                                       &mp->codes[mp->codes_count - 1].size,  -(int)sizeof(HuffCode),
333
111
                                       &mp->codes[mp->codes_count - 1].delta, -(int)sizeof(HuffCode), 1,
334
                                       0, 0, avctx);
335
111
        if (ret < 0)
336
            goto end;
337
    }
338
111
    mp_decode_frame_helper(mp, &gb);
339
111
    ff_free_vlc(&mp->vlc);
340
341
111
end:
342
111
    if ((ret = av_frame_ref(data, mp->frame)) < 0)
343
        return ret;
344
111
    *got_frame       = 1;
345
111
    return buf_size;
346
}
347
348
AVCodec ff_motionpixels_decoder = {
349
    .name           = "motionpixels",
350
    .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
351
    .type           = AVMEDIA_TYPE_VIDEO,
352
    .id             = AV_CODEC_ID_MOTIONPIXELS,
353
    .priv_data_size = sizeof(MotionPixelsContext),
354
    .init           = mp_decode_init,
355
    .close          = mp_decode_end,
356
    .decode         = mp_decode_frame,
357
    .capabilities   = AV_CODEC_CAP_DR1,
358
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
359
};