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
mp_decode_end(AVCodecContext * avctx)53 static av_cold int mp_decode_end(AVCodecContext *avctx)
54 {
55 MotionPixelsContext *mp = avctx->priv_data;
56
57 av_freep(&mp->changes_map);
58 av_freep(&mp->vpt);
59 av_freep(&mp->hpt);
60 av_freep(&mp->bswapbuf);
61 av_frame_free(&mp->frame);
62
63 return 0;
64 }
65
mp_decode_init(AVCodecContext * avctx)66 static av_cold int mp_decode_init(AVCodecContext *avctx)
67 {
68 MotionPixelsContext *mp = avctx->priv_data;
69 int w4 = (avctx->width + 3) & ~3;
70 int h4 = (avctx->height + 3) & ~3;
71
72 if(avctx->extradata_size < 2){
73 av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
74 return AVERROR_INVALIDDATA;
75 }
76
77 motionpixels_tableinit();
78 mp->avctx = avctx;
79 ff_bswapdsp_init(&mp->bdsp);
80 mp->changes_map = av_mallocz_array(avctx->width, h4);
81 mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
82 mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
83 mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
84 if (!mp->changes_map || !mp->vpt || !mp->hpt) {
85 av_freep(&mp->changes_map);
86 av_freep(&mp->vpt);
87 av_freep(&mp->hpt);
88 return AVERROR(ENOMEM);
89 }
90 avctx->pix_fmt = AV_PIX_FMT_RGB555;
91
92 mp->frame = av_frame_alloc();
93 if (!mp->frame) {
94 mp_decode_end(avctx);
95 return AVERROR(ENOMEM);
96 }
97
98 return 0;
99 }
100
mp_read_changes_map(MotionPixelsContext * mp,GetBitContext * gb,int count,int bits_len,int read_color)101 static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
102 {
103 uint16_t *pixels;
104 int offset, w, h, color = 0, x, y, i;
105
106 while (count--) {
107 offset = get_bits_long(gb, mp->offset_bits_len);
108 w = get_bits(gb, bits_len) + 1;
109 h = get_bits(gb, bits_len) + 1;
110 if (read_color)
111 color = get_bits(gb, 15);
112 x = offset % mp->avctx->width;
113 y = offset / mp->avctx->width;
114 if (y >= mp->avctx->height)
115 continue;
116 w = FFMIN(w, mp->avctx->width - x);
117 h = FFMIN(h, mp->avctx->height - y);
118 pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
119 while (h--) {
120 mp->changes_map[offset] = w;
121 if (read_color)
122 for (i = 0; i < w; ++i)
123 pixels[i] = color;
124 offset += mp->avctx->width;
125 pixels += mp->frame->linesize[0] / 2;
126 }
127 }
128 }
129
mp_get_code(MotionPixelsContext * mp,GetBitContext * gb,int size,int code)130 static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
131 {
132 while (get_bits1(gb)) {
133 ++size;
134 if (size > mp->max_codes_bits) {
135 av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
136 return AVERROR_INVALIDDATA;
137 }
138 code <<= 1;
139 if (mp_get_code(mp, gb, size, code + 1) < 0)
140 return AVERROR_INVALIDDATA;
141 }
142 if (mp->current_codes_count >= MAX_HUFF_CODES) {
143 av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
144 return AVERROR_INVALIDDATA;
145 }
146
147 mp->codes[mp->current_codes_count ].code = code;
148 mp->codes[mp->current_codes_count++].size = size;
149 return 0;
150 }
151
mp_read_codes_table(MotionPixelsContext * mp,GetBitContext * gb)152 static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
153 {
154 if (mp->codes_count == 1) {
155 mp->codes[0].delta = get_bits(gb, 4);
156 } else {
157 int i;
158 int ret;
159
160 mp->max_codes_bits = get_bits(gb, 4);
161 for (i = 0; i < mp->codes_count; ++i)
162 mp->codes[i].delta = get_bits(gb, 4);
163 mp->current_codes_count = 0;
164 if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
165 return ret;
166 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 return 0;
172 }
173
mp_gradient(MotionPixelsContext * mp,int component,int v)174 static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
175 {
176 int delta;
177
178 delta = (v - 7) * mp->gradient_scale[component];
179 mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
180 return delta;
181 }
182
mp_get_yuv_from_rgb(MotionPixelsContext * mp,int x,int y)183 static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
184 {
185 int color;
186
187 color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
188 return mp_rgb_yuv_table[color];
189 }
190
mp_set_rgb_from_yuv(MotionPixelsContext * mp,int x,int y,const YuvPixel * p)191 static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
192 {
193 int color;
194
195 color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
196 *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
197 }
198
mp_get_vlc(MotionPixelsContext * mp,GetBitContext * gb)199 static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
200 {
201 int i;
202
203 i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
204 if (i < 0)
205 return i;
206 return mp->codes[i].delta;
207 }
208
mp_decode_line(MotionPixelsContext * mp,GetBitContext * gb,int y)209 static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
210 {
211 YuvPixel p;
212 const int y0 = y * mp->avctx->width;
213 int w, i, x = 0;
214
215 p = mp->vpt[y];
216 if (mp->changes_map[y0 + x] == 0) {
217 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
218 ++x;
219 }
220 while (x < mp->avctx->width) {
221 w = mp->changes_map[y0 + x];
222 if (w != 0) {
223 if ((y & 3) == 0) {
224 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
225 mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
226 mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
227 for (i = (x + 3) & ~3; i < x + w; i += 4) {
228 mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
229 }
230 }
231 }
232 x += w;
233 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
234 p = mp_get_yuv_from_rgb(mp, x - 1, y);
235 } else {
236 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
237 p.y = av_clip_uintp2(p.y, 5);
238 if ((x & 3) == 0) {
239 if ((y & 3) == 0) {
240 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
241 p.v = av_clip_intp2(p.v, 5);
242 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
243 p.u = av_clip_intp2(p.u, 5);
244 mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
245 } else {
246 p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
247 p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
248 }
249 }
250 mp_set_rgb_from_yuv(mp, x, y, &p);
251 ++x;
252 }
253 }
254 }
255
mp_decode_frame_helper(MotionPixelsContext * mp,GetBitContext * gb)256 static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
257 {
258 YuvPixel p;
259 int y, y0;
260
261 av_assert1(mp->changes_map[0]);
262
263 for (y = 0; y < mp->avctx->height; ++y) {
264 if (mp->changes_map[y * mp->avctx->width] != 0) {
265 memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
266 p = mp_get_yuv_from_rgb(mp, 0, y);
267 } else {
268 p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
269 p.y = av_clip_uintp2(p.y, 5);
270 if ((y & 3) == 0) {
271 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
272 p.v = av_clip_intp2(p.v, 5);
273 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
274 p.u = av_clip_intp2(p.u, 5);
275 }
276 mp->vpt[y] = p;
277 mp_set_rgb_from_yuv(mp, 0, y, &p);
278 }
279 }
280 for (y0 = 0; y0 < 2; ++y0)
281 for (y = y0; y < mp->avctx->height; y += 2)
282 mp_decode_line(mp, gb, y);
283 }
284
mp_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)285 static int mp_decode_frame(AVCodecContext *avctx,
286 void *data, int *got_frame,
287 AVPacket *avpkt)
288 {
289 const uint8_t *buf = avpkt->data;
290 int buf_size = avpkt->size;
291 MotionPixelsContext *mp = avctx->priv_data;
292 GetBitContext gb;
293 int i, count1, count2, sz, ret;
294
295 if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
296 return ret;
297
298 /* le32 bitstream msb first */
299 av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
300 if (!mp->bswapbuf)
301 return AVERROR(ENOMEM);
302 mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
303 buf_size / 4);
304 if (buf_size & 3)
305 memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
306 init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
307
308 memset(mp->changes_map, 0, avctx->width * avctx->height);
309 for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
310 count1 = get_bits(&gb, 12);
311 count2 = get_bits(&gb, 12);
312 mp_read_changes_map(mp, &gb, count1, 8, i);
313 mp_read_changes_map(mp, &gb, count2, 4, i);
314 }
315
316 mp->codes_count = get_bits(&gb, 4);
317 if (mp->codes_count == 0)
318 goto end;
319
320 if (mp->changes_map[0] == 0) {
321 *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
322 mp->changes_map[0] = 1;
323 }
324 if (mp_read_codes_table(mp, &gb) < 0)
325 goto end;
326
327 sz = get_bits(&gb, 18);
328 if (avctx->extradata[0] != 5)
329 sz += get_bits(&gb, 18);
330 if (sz == 0)
331 goto end;
332
333 if (mp->max_codes_bits <= 0)
334 goto end;
335 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))
336 goto end;
337 mp_decode_frame_helper(mp, &gb);
338 ff_free_vlc(&mp->vlc);
339
340 end:
341 if ((ret = av_frame_ref(data, mp->frame)) < 0)
342 return ret;
343 *got_frame = 1;
344 return buf_size;
345 }
346
347 AVCodec ff_motionpixels_decoder = {
348 .name = "motionpixels",
349 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
350 .type = AVMEDIA_TYPE_VIDEO,
351 .id = AV_CODEC_ID_MOTIONPIXELS,
352 .priv_data_size = sizeof(MotionPixelsContext),
353 .init = mp_decode_init,
354 .close = mp_decode_end,
355 .decode = mp_decode_frame,
356 .capabilities = AV_CODEC_CAP_DR1,
357 };
358