FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/motionpixels.c
Date: 2022-07-06 18:02:43
Exec Total Coverage
Lines: 167 188 88.8%
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 "codec_internal.h"
30 #include "internal.h"
31
32 #define MAX_HUFF_CODES 16
33
34 #include "motionpixels_tablegen.h"
35
36 typedef struct HuffCode {
37 uint8_t size;
38 uint8_t delta;
39 } HuffCode;
40
41 typedef struct MotionPixelsContext {
42 AVCodecContext *avctx;
43 AVFrame *frame;
44 BswapDSPContext bdsp;
45 uint8_t *changes_map;
46 int offset_bits_len;
47 int codes_count, current_codes_count;
48 int max_codes_bits;
49 HuffCode codes[MAX_HUFF_CODES];
50 VLC vlc;
51 YuvPixel *vpt, *hpt;
52 uint8_t gradient_scale[3];
53 uint8_t *bswapbuf;
54 int bswapbuf_size;
55 } MotionPixelsContext;
56
57 2 static av_cold int mp_decode_end(AVCodecContext *avctx)
58 {
59 2 MotionPixelsContext *mp = avctx->priv_data;
60
61 2 av_freep(&mp->changes_map);
62 2 av_freep(&mp->vpt);
63 2 av_freep(&mp->hpt);
64 2 av_freep(&mp->bswapbuf);
65 2 av_frame_free(&mp->frame);
66
67 2 return 0;
68 }
69
70 2 static av_cold int mp_decode_init(AVCodecContext *avctx)
71 {
72 av_unused static AVOnce init_static_once = AV_ONCE_INIT;
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 2 ff_thread_once(&init_static_once, motionpixels_tableinit);
98 #endif
99
100 2 return 0;
101 }
102
103 444 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
104 {
105 uint16_t *pixels;
106 444 int offset, w, h, color = 0, x, y, i;
107
108
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27419 while (count--) {
109 26975 offset = get_bits_long(gb, mp->offset_bits_len);
110 26975 w = get_bits(gb, bits_len) + 1;
111 26975 h = get_bits(gb, bits_len) + 1;
112
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26975 if (read_color)
113 16095 color = get_bits(gb, 15);
114 26975 x = offset % mp->avctx->width;
115 26975 y = offset / mp->avctx->width;
116
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26975 if (y >= mp->avctx->height)
117 continue;
118 26975 w = FFMIN(w, mp->avctx->width - x);
119 26975 h = FFMIN(h, mp->avctx->height - y);
120 26975 pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
121
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325261 while (h--) {
122 298286 mp->changes_map[offset] = w;
123
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298286 if (read_color)
124
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1832851 for (i = 0; i < w; ++i)
125 1646821 pixels[i] = color;
126 298286 offset += mp->avctx->width;
127 298286 pixels += mp->frame->linesize[0] / 2;
128 }
129 }
130 444 }
131
132 1651 static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size)
133 {
134
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3191 while (get_bits1(gb)) {
135 1540 ++size;
136
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1540 if (size > mp->max_codes_bits) {
137 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
138 return AVERROR_INVALIDDATA;
139 }
140
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1540 if (mp_get_code(mp, gb, size) < 0)
141 return AVERROR_INVALIDDATA;
142 }
143
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1651 if (mp->current_codes_count >= mp->codes_count) {
144 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
145 return AVERROR_INVALIDDATA;
146 }
147
148 1651 mp->codes[mp->current_codes_count++].size = size;
149 1651 return 0;
150 }
151
152 111 static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
153 {
154
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111 if (mp->codes_count == 1) {
155 mp->codes[0].delta = get_bits(gb, 4);
156 } else {
157 int i;
158 int ret;
159
160 111 mp->max_codes_bits = get_bits(gb, 4);
161
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1762 for (i = 0; i < mp->codes_count; ++i)
162 1651 mp->codes[i].delta = get_bits(gb, 4);
163 111 mp->current_codes_count = 0;
164
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111 if ((ret = mp_get_code(mp, gb, 0)) < 0)
165 return ret;
166
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111 if (mp->current_codes_count < mp->codes_count) {
167 av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
168 return AVERROR_INVALIDDATA;
169 }
170 }
171 111 return 0;
172 }
173
174 6395631 static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
175 {
176 int delta;
177
178 6395631 delta = (v - 7) * mp->gradient_scale[component];
179
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6395631 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
180 6395631 return delta;
181 }
182
183 340991 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
184 {
185 int color;
186
187 340991 color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
188 340991 return mp_rgb_yuv_table[color];
189 }
190
191 5666143 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
192 {
193 int color;
194
195 5666143 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
196 5666143 *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
197 5666143 }
198
199 6395631 static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
200 {
201 6395631 return mp->vlc.table ? get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1)
202
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12791262 : mp->codes[0].delta;
203 }
204
205 26640 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
206 {
207 YuvPixel p;
208 26640 const int y0 = y * mp->avctx->width;
209 26640 int w, i, x = 0;
210
211 26640 p = mp->vpt[y];
212
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26640 if (mp->changes_map[y0 + x] == 0) {
213 18532 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
214 18532 ++x;
215 }
216
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5972637 while (x < mp->avctx->width) {
217 5945997 w = mp->changes_map[y0 + x];
218
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5945997 if (w != 0) {
219
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298386 if ((y & 3) == 0) {
220
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73166 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
221
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69448 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
222
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65081 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
223
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47814 for (i = (x + 3) & ~3; i < x + w; i += 4) {
224 34497 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
225 }
226 }
227 }
228 298386 x += w;
229 298386 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
230 298386 p = mp_get_yuv_from_rgb(mp, x - 1, y);
231 } else {
232 5647611 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
233 5647611 p.y = av_clip_uintp2(p.y, 5);
234
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5647611 if ((x & 3) == 0) {
235
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1417461 if ((y & 3) == 0) {
236 360154 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
237 360154 p.v = av_clip_intp2(p.v, 5);
238 360154 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
239 360154 p.u = av_clip_intp2(p.u, 5);
240 360154 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
241 } else {
242 1057307 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
243 1057307 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
244 }
245 }
246 5647611 mp_set_rgb_from_yuv(mp, x, y, &p);
247 5647611 ++x;
248 }
249 }
250 26640 }
251
252 111 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
253 {
254 YuvPixel p;
255 int y, y0;
256
257 av_assert1(mp->changes_map[0]);
258
259
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26751 for (y = 0; y < mp->avctx->height; ++y) {
260
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26640 if (mp->changes_map[y * mp->avctx->width] != 0) {
261 8108 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
262 8108 p = mp_get_yuv_from_rgb(mp, 0, y);
263 } else {
264 18532 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
265 18532 p.y = av_clip_uintp2(p.y, 5);
266
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18532 if ((y & 3) == 0) {
267 4590 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
268 4590 p.v = av_clip_intp2(p.v, 5);
269 4590 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
270 4590 p.u = av_clip_intp2(p.u, 5);
271 }
272 18532 mp->vpt[y] = p;
273 18532 mp_set_rgb_from_yuv(mp, 0, y, &p);
274 }
275 }
276
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333 for (y0 = 0; y0 < 2; ++y0)
277
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26862 for (y = y0; y < mp->avctx->height; y += 2)
278 26640 mp_decode_line(mp, gb, y);
279 111 }
280
281 111 static int mp_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
282 int *got_frame, 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
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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
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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
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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
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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
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111 if (mp->codes_count == 0)
313 goto end;
314
315
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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
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111 if (mp_read_codes_table(mp, &gb) < 0)
320 goto end;
321
322 111 sz = get_bits(&gb, 18);
323
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111 if (avctx->extradata[0] != 5)
324 111 sz += get_bits(&gb, 18);
325
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111 if (sz == 0)
326 goto end;
327
328
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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
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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
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111 if ((ret = av_frame_ref(rframe, mp->frame)) < 0)
343 return ret;
344 111 *got_frame = 1;
345 111 return buf_size;
346 }
347
348 const FFCodec ff_motionpixels_decoder = {
349 .p.name = "motionpixels",
350 .p.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
351 .p.type = AVMEDIA_TYPE_VIDEO,
352 .p.id = AV_CODEC_ID_MOTIONPIXELS,
353 .priv_data_size = sizeof(MotionPixelsContext),
354 .init = mp_decode_init,
355 .close = mp_decode_end,
356 FF_CODEC_DECODE_CB(mp_decode_frame),
357 .p.capabilities = AV_CODEC_CAP_DR1,
358 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
359 };
360