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  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. #include "avcodec.h"
  22. #include "get_bits.h"
  23. #include "dsputil.h"
  24. #define MAX_HUFF_CODES 16
  25. #include "motionpixels_tablegen.h"
  26. typedef struct HuffCode {
  27. int code;
  28. uint8_t size;
  29. uint8_t delta;
  30. } HuffCode;
  31. typedef struct MotionPixelsContext {
  32. AVCodecContext *avctx;
  33. AVFrame frame;
  34. DSPContext dsp;
  35. uint8_t *changes_map;
  36. int offset_bits_len;
  37. int codes_count, current_codes_count;
  38. int max_codes_bits;
  39. HuffCode codes[MAX_HUFF_CODES];
  40. VLC vlc;
  41. YuvPixel *vpt, *hpt;
  42. uint8_t gradient_scale[3];
  43. uint8_t *bswapbuf;
  44. int bswapbuf_size;
  45. } MotionPixelsContext;
  46. static av_cold int mp_decode_init(AVCodecContext *avctx)
  47. {
  48. MotionPixelsContext *mp = avctx->priv_data;
  49. int w4 = (avctx->width + 3) & ~3;
  50. int h4 = (avctx->height + 3) & ~3;
  51. motionpixels_tableinit();
  52. mp->avctx = avctx;
  53. ff_dsputil_init(&mp->dsp, avctx);
  54. mp->changes_map = av_mallocz(avctx->width * h4);
  55. mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
  56. mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
  57. mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
  58. avctx->pix_fmt = PIX_FMT_RGB555;
  59. avcodec_get_frame_defaults(&mp->frame);
  60. return 0;
  61. }
  62. static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
  63. {
  64. uint16_t *pixels;
  65. int offset, w, h, color = 0, x, y, i;
  66. while (count--) {
  67. offset = get_bits_long(gb, mp->offset_bits_len);
  68. w = get_bits(gb, bits_len) + 1;
  69. h = get_bits(gb, bits_len) + 1;
  70. if (read_color)
  71. color = get_bits(gb, 15);
  72. x = offset % mp->avctx->width;
  73. y = offset / mp->avctx->width;
  74. if (y >= mp->avctx->height)
  75. continue;
  76. w = FFMIN(w, mp->avctx->width - x);
  77. h = FFMIN(h, mp->avctx->height - y);
  78. pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
  79. while (h--) {
  80. mp->changes_map[offset] = w;
  81. if (read_color)
  82. for (i = 0; i < w; ++i)
  83. pixels[i] = color;
  84. offset += mp->avctx->width;
  85. pixels += mp->frame.linesize[0] / 2;
  86. }
  87. }
  88. }
  89. static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
  90. {
  91. while (get_bits1(gb)) {
  92. ++size;
  93. if (size > mp->max_codes_bits) {
  94. av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
  95. return;
  96. }
  97. code <<= 1;
  98. mp_get_code(mp, gb, size, code + 1);
  99. }
  100. if (mp->current_codes_count >= MAX_HUFF_CODES) {
  101. av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
  102. return;
  103. }
  104. mp->codes[mp->current_codes_count ].code = code;
  105. mp->codes[mp->current_codes_count++].size = size;
  106. }
  107. static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
  108. {
  109. if (mp->codes_count == 1) {
  110. mp->codes[0].delta = get_bits(gb, 4);
  111. } else {
  112. int i;
  113. mp->max_codes_bits = get_bits(gb, 4);
  114. for (i = 0; i < mp->codes_count; ++i)
  115. mp->codes[i].delta = get_bits(gb, 4);
  116. mp->current_codes_count = 0;
  117. mp_get_code(mp, gb, 0, 0);
  118. }
  119. }
  120. static int mp_gradient(MotionPixelsContext *mp, int component, int v)
  121. {
  122. int delta;
  123. delta = (v - 7) * mp->gradient_scale[component];
  124. mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
  125. return delta;
  126. }
  127. static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
  128. {
  129. int color;
  130. color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
  131. return mp_rgb_yuv_table[color];
  132. }
  133. static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
  134. {
  135. int color;
  136. color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
  137. *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
  138. }
  139. static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
  140. {
  141. int i;
  142. i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
  143. return mp->codes[i].delta;
  144. }
  145. static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
  146. {
  147. YuvPixel p;
  148. const int y0 = y * mp->avctx->width;
  149. int w, i, x = 0;
  150. p = mp->vpt[y];
  151. if (mp->changes_map[y0 + x] == 0) {
  152. memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
  153. ++x;
  154. }
  155. while (x < mp->avctx->width) {
  156. w = mp->changes_map[y0 + x];
  157. if (w != 0) {
  158. if ((y & 3) == 0) {
  159. if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
  160. mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
  161. mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
  162. for (i = (x + 3) & ~3; i < x + w; i += 4) {
  163. mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
  164. }
  165. }
  166. }
  167. x += w;
  168. memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
  169. p = mp_get_yuv_from_rgb(mp, x - 1, y);
  170. } else {
  171. p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
  172. p.y = av_clip(p.y, 0, 31);
  173. if ((x & 3) == 0) {
  174. if ((y & 3) == 0) {
  175. p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
  176. p.v = av_clip(p.v, -32, 31);
  177. p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
  178. p.u = av_clip(p.u, -32, 31);
  179. mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
  180. } else {
  181. p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
  182. p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
  183. }
  184. }
  185. mp_set_rgb_from_yuv(mp, x, y, &p);
  186. ++x;
  187. }
  188. }
  189. }
  190. static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
  191. {
  192. YuvPixel p;
  193. int y, y0;
  194. for (y = 0; y < mp->avctx->height; ++y) {
  195. if (mp->changes_map[y * mp->avctx->width] != 0) {
  196. memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
  197. p = mp_get_yuv_from_rgb(mp, 0, y);
  198. } else {
  199. p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
  200. p.y = av_clip(p.y, 0, 31);
  201. if ((y & 3) == 0) {
  202. p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
  203. p.v = av_clip(p.v, -32, 31);
  204. p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
  205. p.u = av_clip(p.u, -32, 31);
  206. }
  207. mp->vpt[y] = p;
  208. mp_set_rgb_from_yuv(mp, 0, y, &p);
  209. }
  210. }
  211. for (y0 = 0; y0 < 2; ++y0)
  212. for (y = y0; y < mp->avctx->height; y += 2)
  213. mp_decode_line(mp, gb, y);
  214. }
  215. static int mp_decode_frame(AVCodecContext *avctx,
  216. void *data, int *data_size,
  217. AVPacket *avpkt)
  218. {
  219. const uint8_t *buf = avpkt->data;
  220. int buf_size = avpkt->size;
  221. MotionPixelsContext *mp = avctx->priv_data;
  222. GetBitContext gb;
  223. int i, count1, count2, sz;
  224. mp->frame.reference = 3;
  225. mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
  226. if (avctx->reget_buffer(avctx, &mp->frame)) {
  227. av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  228. return -1;
  229. }
  230. /* le32 bitstream msb first */
  231. av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
  232. if (!mp->bswapbuf)
  233. return AVERROR(ENOMEM);
  234. mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
  235. if (buf_size & 3)
  236. memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
  237. memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  238. init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
  239. memset(mp->changes_map, 0, avctx->width * avctx->height);
  240. for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
  241. count1 = get_bits(&gb, 12);
  242. count2 = get_bits(&gb, 12);
  243. mp_read_changes_map(mp, &gb, count1, 8, i);
  244. mp_read_changes_map(mp, &gb, count2, 4, i);
  245. }
  246. mp->codes_count = get_bits(&gb, 4);
  247. if (mp->codes_count == 0)
  248. goto end;
  249. if (mp->changes_map[0] == 0) {
  250. *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
  251. mp->changes_map[0] = 1;
  252. }
  253. mp_read_codes_table(mp, &gb);
  254. sz = get_bits(&gb, 18);
  255. if (avctx->extradata[0] != 5)
  256. sz += get_bits(&gb, 18);
  257. if (sz == 0)
  258. goto end;
  259. if (mp->max_codes_bits <= 0)
  260. goto end;
  261. 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))
  262. goto end;
  263. mp_decode_frame_helper(mp, &gb);
  264. ff_free_vlc(&mp->vlc);
  265. end:
  266. *data_size = sizeof(AVFrame);
  267. *(AVFrame *)data = mp->frame;
  268. return buf_size;
  269. }
  270. static av_cold int mp_decode_end(AVCodecContext *avctx)
  271. {
  272. MotionPixelsContext *mp = avctx->priv_data;
  273. av_freep(&mp->changes_map);
  274. av_freep(&mp->vpt);
  275. av_freep(&mp->hpt);
  276. av_freep(&mp->bswapbuf);
  277. if (mp->frame.data[0])
  278. avctx->release_buffer(avctx, &mp->frame);
  279. return 0;
  280. }
  281. AVCodec ff_motionpixels_decoder = {
  282. .name = "motionpixels",
  283. .type = AVMEDIA_TYPE_VIDEO,
  284. .id = CODEC_ID_MOTIONPIXELS,
  285. .priv_data_size = sizeof(MotionPixelsContext),
  286. .init = mp_decode_init,
  287. .close = mp_decode_end,
  288. .decode = mp_decode_frame,
  289. .capabilities = CODEC_CAP_DR1,
  290. .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
  291. };