FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/motionpixels.c
Date: 2025-07-15 19:03:42
Exec Total Coverage
Lines: 167 188 88.8%
Functions: 12 12 100.0%
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/mem.h"
23 #include "libavutil/thread.h"
24
25 #include "config.h"
26
27 #include "avcodec.h"
28 #include "get_bits.h"
29 #include "bswapdsp.h"
30 #include "codec_internal.h"
31 #include "decode.h"
32
33 #define MAX_HUFF_CODES 16
34
35 #include "motionpixels_tablegen.h"
36
37 typedef struct HuffCode {
38 uint8_t size;
39 uint8_t delta;
40 } HuffCode;
41
42 typedef struct MotionPixelsContext {
43 AVCodecContext *avctx;
44 AVFrame *frame;
45 BswapDSPContext bdsp;
46 uint8_t *changes_map;
47 int offset_bits_len;
48 int codes_count, current_codes_count;
49 int max_codes_bits;
50 HuffCode codes[MAX_HUFF_CODES];
51 VLC vlc;
52 YuvPixel *vpt, *hpt;
53 uint8_t gradient_scale[3];
54 uint8_t *bswapbuf;
55 int bswapbuf_size;
56 } MotionPixelsContext;
57
58 2 static av_cold int mp_decode_end(AVCodecContext *avctx)
59 {
60 2 MotionPixelsContext *mp = avctx->priv_data;
61
62 2 av_freep(&mp->changes_map);
63 2 av_freep(&mp->vpt);
64 2 av_freep(&mp->hpt);
65 2 av_freep(&mp->bswapbuf);
66 2 av_frame_free(&mp->frame);
67
68 2 return 0;
69 }
70
71 2 static av_cold int mp_decode_init(AVCodecContext *avctx)
72 {
73 2 MotionPixelsContext *mp = avctx->priv_data;
74 2 int w4 = (avctx->width + 3) & ~3;
75 2 int h4 = (avctx->height + 3) & ~3;
76
77
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 2 if(avctx->extradata_size < 2){
78 ✗ av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
79 ✗ return AVERROR_INVALIDDATA;
80 }
81
82 2 mp->avctx = avctx;
83 2 ff_bswapdsp_init(&mp->bdsp);
84 2 mp->changes_map = av_calloc(avctx->width, h4);
85 2 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
86 2 mp->vpt = av_calloc(avctx->height, sizeof(*mp->vpt));
87 2 mp->hpt = av_calloc(h4 / 4, w4 / 4 * sizeof(*mp->hpt));
88
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 2 if (!mp->changes_map || !mp->vpt || !mp->hpt)
89 ✗ return AVERROR(ENOMEM);
90 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
91
92 2 mp->frame = av_frame_alloc();
93
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 2 if (!mp->frame)
94 ✗ return AVERROR(ENOMEM);
95
96 #if !CONFIG_HARDCODED_TABLES
97 static AVOnce init_static_once = AV_ONCE_INIT;
98 2 ff_thread_once(&init_static_once, motionpixels_tableinit);
99 #endif
100
101 2 return 0;
102 }
103
104 448 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
105 {
106 uint16_t *pixels;
107 448 int offset, w, h, color = 0, x, y, i;
108
109
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 27618 while (count--) {
110 27170 offset = get_bits_long(gb, mp->offset_bits_len);
111 27170 w = get_bits(gb, bits_len) + 1;
112 27170 h = get_bits(gb, bits_len) + 1;
113
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 27170 if (read_color)
114 16209 color = get_bits(gb, 15);
115 27170 x = offset % mp->avctx->width;
116 27170 y = offset / mp->avctx->width;
117
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 27170 if (y >= mp->avctx->height)
118 ✗ continue;
119 27170 w = FFMIN(w, mp->avctx->width - x);
120 27170 h = FFMIN(h, mp->avctx->height - y);
121 27170 pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
122
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 328138 while (h--) {
123 300968 mp->changes_map[offset] = w;
124
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 300968 if (read_color)
125
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 1840780 for (i = 0; i < w; ++i)
126 1653565 pixels[i] = color;
127 300968 offset += mp->avctx->width;
128 300968 pixels += mp->frame->linesize[0] / 2;
129 }
130 }
131 448 }
132
133 1666 static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size)
134 {
135
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 3220 while (get_bits1(gb)) {
136 1554 ++size;
137
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 1554 if (size > mp->max_codes_bits) {
138 ✗ av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
139 ✗ return AVERROR_INVALIDDATA;
140 }
141
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 1554 if (mp_get_code(mp, gb, size) < 0)
142 ✗ return AVERROR_INVALIDDATA;
143 }
144
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 1666 if (mp->current_codes_count >= mp->codes_count) {
145 ✗ av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
146 ✗ return AVERROR_INVALIDDATA;
147 }
148
149 1666 mp->codes[mp->current_codes_count++].size = size;
150 1666 return 0;
151 }
152
153 112 static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
154 {
155
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 112 if (mp->codes_count == 1) {
156 ✗ mp->codes[0].delta = get_bits(gb, 4);
157 } else {
158 int i;
159 int ret;
160
161 112 mp->max_codes_bits = get_bits(gb, 4);
162
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 1778 for (i = 0; i < mp->codes_count; ++i)
163 1666 mp->codes[i].delta = get_bits(gb, 4);
164 112 mp->current_codes_count = 0;
165
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 112 if ((ret = mp_get_code(mp, gb, 0)) < 0)
166 ✗ return ret;
167
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 112 if (mp->current_codes_count < mp->codes_count) {
168 ✗ av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
169 ✗ return AVERROR_INVALIDDATA;
170 }
171 }
172 112 return 0;
173 }
174
175 6440131 static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
176 {
177 int delta;
178
179 6440131 delta = (v - 7) * mp->gradient_scale[component];
180
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 6440131 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
181 6440131 return delta;
182 }
183
184 344166 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
185 {
186 int color;
187
188 344166 color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
189 344166 return mp_rgb_yuv_table[color & 0x7FFF];
190 }
191
192 5705507 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
193 {
194 int color;
195
196 5705507 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
197 5705507 *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
198 5705507 }
199
200 6440131 static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
201 {
202 6440131 return mp->vlc.table ? get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1)
203
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 12880262 : mp->codes[0].delta;
204 }
205
206 26880 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
207 {
208 YuvPixel p;
209 26880 const int y0 = y * mp->avctx->width;
210 26880 int w, i, x = 0;
211
212 26880 p = mp->vpt[y];
213
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 26880 if (mp->changes_map[y0 + x] == 0) {
214 18601 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
215 18601 ++x;
216 }
217
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 6014855 while (x < mp->avctx->width) {
218 5987975 w = mp->changes_map[y0 + x];
219
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 5987975 if (w != 0) {
220
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 301069 if ((y & 3) == 0) {
221
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 73826 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
222
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 70086 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
223
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 65689 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
224
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 48221 for (i = (x + 3) & ~3; i < x + w; i += 4) {
225 34818 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
226 }
227 }
228 }
229 301069 x += w;
230 301069 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
231 301069 p = mp_get_yuv_from_rgb(mp, x - 1, y);
232 } else {
233 5686906 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
234 5686906 p.y = av_clip_uintp2(p.y, 5);
235
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 5686906 if ((x & 3) == 0) {
236
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 1427391 if ((y & 3) == 0) {
237 362706 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
238 362706 p.v = av_clip_intp2(p.v, 5);
239 362706 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
240 362706 p.u = av_clip_intp2(p.u, 5);
241 362706 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
242 } else {
243 1064685 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
244 1064685 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
245 }
246 }
247 5686906 mp_set_rgb_from_yuv(mp, x, y, &p);
248 5686906 ++x;
249 }
250 }
251 26880 }
252
253 112 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
254 {
255 YuvPixel p;
256 int y, y0;
257
258 av_assert1(mp->changes_map[0]);
259
260
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 26992 for (y = 0; y < mp->avctx->height; ++y) {
261
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 26880 if (mp->changes_map[y * mp->avctx->width] != 0) {
262 8279 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
263 8279 p = mp_get_yuv_from_rgb(mp, 0, y);
264 } else {
265 18601 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
266 18601 p.y = av_clip_uintp2(p.y, 5);
267
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 18601 if ((y & 3) == 0) {
268 4606 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
269 4606 p.v = av_clip_intp2(p.v, 5);
270 4606 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
271 4606 p.u = av_clip_intp2(p.u, 5);
272 }
273 18601 mp->vpt[y] = p;
274 18601 mp_set_rgb_from_yuv(mp, 0, y, &p);
275 }
276 }
277
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 336 for (y0 = 0; y0 < 2; ++y0)
278
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 27104 for (y = y0; y < mp->avctx->height; y += 2)
279 26880 mp_decode_line(mp, gb, y);
280 112 }
281
282 112 static int mp_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
283 int *got_frame, AVPacket *avpkt)
284 {
285 112 const uint8_t *buf = avpkt->data;
286 112 int buf_size = avpkt->size;
287 112 MotionPixelsContext *mp = avctx->priv_data;
288 GetBitContext gb;
289 int i, count1, count2, sz, ret;
290
291
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 112 if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
292 ✗ return ret;
293
294 /* le32 bitstream msb first */
295 112 av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
296
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 112 if (!mp->bswapbuf)
297 ✗ return AVERROR(ENOMEM);
298 112 mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
299 buf_size / 4);
300
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 112 if (buf_size & 3)
301 88 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
302 112 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
303
304 112 memset(mp->changes_map, 0, avctx->width * avctx->height);
305
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 336 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
306 224 count1 = get_bits(&gb, 12);
307 224 count2 = get_bits(&gb, 12);
308 224 mp_read_changes_map(mp, &gb, count1, 8, i);
309 224 mp_read_changes_map(mp, &gb, count2, 4, i);
310 }
311
312 112 mp->codes_count = get_bits(&gb, 4);
313
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 112 if (mp->codes_count == 0)
314 ✗ goto end;
315
316
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 112 if (mp->changes_map[0] == 0) {
317 101 *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
318 101 mp->changes_map[0] = 1;
319 }
320
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 112 if (mp_read_codes_table(mp, &gb) < 0)
321 ✗ goto end;
322
323 112 sz = get_bits(&gb, 18);
324
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 112 if (avctx->extradata[0] != 5)
325 112 sz += get_bits(&gb, 18);
326
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 112 if (sz == 0)
327 ✗ goto end;
328
329
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 112 if (mp->codes_count > 1) {
330 /* The entries of the mp->codes array are sorted from right to left
331 * in the Huffman tree, hence -(int)sizeof(HuffCode). */
332 112 ret = ff_vlc_init_from_lengths(&mp->vlc, mp->max_codes_bits, mp->codes_count,
333 112 &mp->codes[mp->codes_count - 1].size, -(int)sizeof(HuffCode),
334 112 &mp->codes[mp->codes_count - 1].delta, -(int)sizeof(HuffCode), 1,
335 0, 0, avctx);
336
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 112 if (ret < 0)
337 ✗ goto end;
338 }
339 112 mp_decode_frame_helper(mp, &gb);
340 112 ff_vlc_free(&mp->vlc);
341
342 112 end:
343
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 112 if ((ret = av_frame_ref(rframe, mp->frame)) < 0)
344 ✗ return ret;
345 112 *got_frame = 1;
346 112 return buf_size;
347 }
348
349 const FFCodec ff_motionpixels_decoder = {
350 .p.name = "motionpixels",
351 CODEC_LONG_NAME("Motion Pixels video"),
352 .p.type = AVMEDIA_TYPE_VIDEO,
353 .p.id = AV_CODEC_ID_MOTIONPIXELS,
354 .priv_data_size = sizeof(MotionPixelsContext),
355 .init = mp_decode_init,
356 .close = mp_decode_end,
357 FF_CODEC_DECODE_CB(mp_decode_frame),
358 .p.capabilities = AV_CODEC_CAP_DR1,
359 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
360 };
361