GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/motionpixels.c Lines: 167 190 87.9 %
Date: 2020-09-25 23:16:12 Branches: 77 100 77.0 %

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 "avcodec.h"
23
#include "get_bits.h"
24
#include "bswapdsp.h"
25
#include "internal.h"
26
27
#define MAX_HUFF_CODES 16
28
29
#include "motionpixels_tablegen.h"
30
31
typedef struct HuffCode {
32
    int code;
33
    uint8_t size;
34
    uint8_t delta;
35
} HuffCode;
36
37
typedef struct MotionPixelsContext {
38
    AVCodecContext *avctx;
39
    AVFrame *frame;
40
    BswapDSPContext bdsp;
41
    uint8_t *changes_map;
42
    int offset_bits_len;
43
    int codes_count, current_codes_count;
44
    int max_codes_bits;
45
    HuffCode codes[MAX_HUFF_CODES];
46
    VLC vlc;
47
    YuvPixel *vpt, *hpt;
48
    uint8_t gradient_scale[3];
49
    uint8_t *bswapbuf;
50
    int bswapbuf_size;
51
} MotionPixelsContext;
52
53
2
static av_cold int mp_decode_end(AVCodecContext *avctx)
54
{
55
2
    MotionPixelsContext *mp = avctx->priv_data;
56
57
2
    av_freep(&mp->changes_map);
58
2
    av_freep(&mp->vpt);
59
2
    av_freep(&mp->hpt);
60
2
    av_freep(&mp->bswapbuf);
61
2
    av_frame_free(&mp->frame);
62
63
2
    return 0;
64
}
65
66
2
static av_cold int mp_decode_init(AVCodecContext *avctx)
67
{
68
2
    MotionPixelsContext *mp = avctx->priv_data;
69
2
    int w4 = (avctx->width  + 3) & ~3;
70
2
    int h4 = (avctx->height + 3) & ~3;
71
72
2
    if(avctx->extradata_size < 2){
73
        av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
74
        return AVERROR_INVALIDDATA;
75
    }
76
77
2
    motionpixels_tableinit();
78
2
    mp->avctx = avctx;
79
2
    ff_bswapdsp_init(&mp->bdsp);
80
2
    mp->changes_map = av_mallocz_array(avctx->width, h4);
81
2
    mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
82
2
    mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
83
2
    mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
84

2
    if (!mp->changes_map || !mp->vpt || !mp->hpt)
85
        return AVERROR(ENOMEM);
86
2
    avctx->pix_fmt = AV_PIX_FMT_RGB555;
87
88
2
    mp->frame = av_frame_alloc();
89
2
    if (!mp->frame)
90
        return AVERROR(ENOMEM);
91
92
2
    return 0;
93
}
94
95
444
static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
96
{
97
    uint16_t *pixels;
98
444
    int offset, w, h, color = 0, x, y, i;
99
100
27419
    while (count--) {
101
26975
        offset = get_bits_long(gb, mp->offset_bits_len);
102
26975
        w      = get_bits(gb, bits_len) + 1;
103
26975
        h      = get_bits(gb, bits_len) + 1;
104
26975
        if (read_color)
105
16095
            color = get_bits(gb, 15);
106
26975
        x = offset % mp->avctx->width;
107
26975
        y = offset / mp->avctx->width;
108
26975
        if (y >= mp->avctx->height)
109
            continue;
110
26975
        w = FFMIN(w, mp->avctx->width  - x);
111
26975
        h = FFMIN(h, mp->avctx->height - y);
112
26975
        pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
113
325261
        while (h--) {
114
298286
            mp->changes_map[offset] = w;
115
298286
            if (read_color)
116
1832851
                for (i = 0; i < w; ++i)
117
1646821
                    pixels[i] = color;
118
298286
            offset += mp->avctx->width;
119
298286
            pixels += mp->frame->linesize[0] / 2;
120
        }
121
    }
122
444
}
123
124
1651
static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
125
{
126
3191
    while (get_bits1(gb)) {
127
1540
        ++size;
128
1540
        if (size > mp->max_codes_bits) {
129
            av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
130
            return AVERROR_INVALIDDATA;
131
        }
132
1540
        code <<= 1;
133
1540
        if (mp_get_code(mp, gb, size, code + 1) < 0)
134
            return AVERROR_INVALIDDATA;
135
    }
136
1651
    if (mp->current_codes_count >= MAX_HUFF_CODES) {
137
        av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
138
        return AVERROR_INVALIDDATA;
139
    }
140
141
1651
    mp->codes[mp->current_codes_count  ].code = code;
142
1651
    mp->codes[mp->current_codes_count++].size = size;
143
1651
    return 0;
144
}
145
146
111
static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
147
{
148
111
    if (mp->codes_count == 1) {
149
        mp->codes[0].delta = get_bits(gb, 4);
150
    } else {
151
        int i;
152
        int ret;
153
154
111
        mp->max_codes_bits = get_bits(gb, 4);
155
1762
        for (i = 0; i < mp->codes_count; ++i)
156
1651
            mp->codes[i].delta = get_bits(gb, 4);
157
111
        mp->current_codes_count = 0;
158
111
        if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
159
            return ret;
160
111
        if (mp->current_codes_count < mp->codes_count) {
161
            av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
162
            return AVERROR_INVALIDDATA;
163
        }
164
   }
165
111
   return 0;
166
}
167
168
6395631
static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
169
{
170
    int delta;
171
172
6395631
    delta = (v - 7) * mp->gradient_scale[component];
173

6395631
    mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
174
6395631
    return delta;
175
}
176
177
340991
static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
178
{
179
    int color;
180
181
340991
    color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
182
340991
    return mp_rgb_yuv_table[color];
183
}
184
185
5666143
static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
186
{
187
    int color;
188
189
5666143
    color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
190
5666143
    *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
191
5666143
}
192
193
6395631
static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
194
{
195
    int i;
196
197
6395631
    i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
198
6395631
    if (i < 0)
199
        return i;
200
6395631
    return mp->codes[i].delta;
201
}
202
203
26640
static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
204
{
205
    YuvPixel p;
206
26640
    const int y0 = y * mp->avctx->width;
207
26640
    int w, i, x = 0;
208
209
26640
    p = mp->vpt[y];
210
26640
    if (mp->changes_map[y0 + x] == 0) {
211
18532
        memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
212
18532
        ++x;
213
    }
214
5972637
    while (x < mp->avctx->width) {
215
5945997
        w = mp->changes_map[y0 + x];
216
5945997
        if (w != 0) {
217
298386
            if ((y & 3) == 0) {
218
73166
                if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
219
69448
                    mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
220
65081
                    mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
221
47814
                    for (i = (x + 3) & ~3; i < x + w; i += 4) {
222
34497
                        mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
223
                    }
224
                }
225
            }
226
298386
            x += w;
227
298386
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
228
298386
            p = mp_get_yuv_from_rgb(mp, x - 1, y);
229
        } else {
230
5647611
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
231
5647611
            p.y = av_clip_uintp2(p.y, 5);
232
5647611
            if ((x & 3) == 0) {
233
1417461
                if ((y & 3) == 0) {
234
360154
                    p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
235
360154
                    p.v = av_clip_intp2(p.v, 5);
236
360154
                    p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
237
360154
                    p.u = av_clip_intp2(p.u, 5);
238
360154
                    mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
239
                } else {
240
1057307
                    p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
241
1057307
                    p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
242
                }
243
            }
244
5647611
            mp_set_rgb_from_yuv(mp, x, y, &p);
245
5647611
            ++x;
246
        }
247
    }
248
26640
}
249
250
111
static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
251
{
252
    YuvPixel p;
253
    int y, y0;
254
255
    av_assert1(mp->changes_map[0]);
256
257
26751
    for (y = 0; y < mp->avctx->height; ++y) {
258
26640
        if (mp->changes_map[y * mp->avctx->width] != 0) {
259
8108
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
260
8108
            p = mp_get_yuv_from_rgb(mp, 0, y);
261
        } else {
262
18532
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
263
18532
            p.y = av_clip_uintp2(p.y, 5);
264
18532
            if ((y & 3) == 0) {
265
4590
                p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
266
4590
                p.v = av_clip_intp2(p.v, 5);
267
4590
                p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
268
4590
                p.u = av_clip_intp2(p.u, 5);
269
            }
270
18532
            mp->vpt[y] = p;
271
18532
            mp_set_rgb_from_yuv(mp, 0, y, &p);
272
        }
273
    }
274
333
    for (y0 = 0; y0 < 2; ++y0)
275
26862
        for (y = y0; y < mp->avctx->height; y += 2)
276
26640
            mp_decode_line(mp, gb, y);
277
111
}
278
279
111
static int mp_decode_frame(AVCodecContext *avctx,
280
                                 void *data, int *got_frame,
281
                                 AVPacket *avpkt)
282
{
283
111
    const uint8_t *buf = avpkt->data;
284
111
    int buf_size = avpkt->size;
285
111
    MotionPixelsContext *mp = avctx->priv_data;
286
    GetBitContext gb;
287
    int i, count1, count2, sz, ret;
288
289
111
    if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
290
        return ret;
291
292
    /* le32 bitstream msb first */
293
111
    av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
294
111
    if (!mp->bswapbuf)
295
        return AVERROR(ENOMEM);
296
111
    mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
297
                       buf_size / 4);
298
111
    if (buf_size & 3)
299
87
        memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
300
111
    init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
301
302
111
    memset(mp->changes_map, 0, avctx->width * avctx->height);
303
333
    for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
304
222
        count1 = get_bits(&gb, 12);
305
222
        count2 = get_bits(&gb, 12);
306
222
        mp_read_changes_map(mp, &gb, count1, 8, i);
307
222
        mp_read_changes_map(mp, &gb, count2, 4, i);
308
    }
309
310
111
    mp->codes_count = get_bits(&gb, 4);
311
111
    if (mp->codes_count == 0)
312
        goto end;
313
314
111
    if (mp->changes_map[0] == 0) {
315
100
        *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
316
100
        mp->changes_map[0] = 1;
317
    }
318
111
    if (mp_read_codes_table(mp, &gb) < 0)
319
        goto end;
320
321
111
    sz = get_bits(&gb, 18);
322
111
    if (avctx->extradata[0] != 5)
323
111
        sz += get_bits(&gb, 18);
324
111
    if (sz == 0)
325
        goto end;
326
327
111
    if (mp->max_codes_bits <= 0)
328
        goto end;
329
111
    if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
330
        goto end;
331
111
    mp_decode_frame_helper(mp, &gb);
332
111
    ff_free_vlc(&mp->vlc);
333
334
111
end:
335
111
    if ((ret = av_frame_ref(data, mp->frame)) < 0)
336
        return ret;
337
111
    *got_frame       = 1;
338
111
    return buf_size;
339
}
340
341
AVCodec ff_motionpixels_decoder = {
342
    .name           = "motionpixels",
343
    .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
344
    .type           = AVMEDIA_TYPE_VIDEO,
345
    .id             = AV_CODEC_ID_MOTIONPIXELS,
346
    .priv_data_size = sizeof(MotionPixelsContext),
347
    .init           = mp_decode_init,
348
    .close          = mp_decode_end,
349
    .decode         = mp_decode_frame,
350
    .capabilities   = AV_CODEC_CAP_DR1,
351
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
352
};