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  1. /*
  2. * Fraps FPS1 decoder
  3. * Copyright (c) 2005 Roine Gustafsson
  4. * Copyright (c) 2006 Konstantin Shishkov
  5. *
  6. * This file is part of FFmpeg.
  7. *
  8. * FFmpeg is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU Lesser General Public
  10. * License as published by the Free Software Foundation; either
  11. * version 2.1 of the License, or (at your option) any later version.
  12. *
  13. * FFmpeg is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16. * Lesser General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU Lesser General Public
  19. * License along with FFmpeg; if not, write to the Free Software
  20. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21. */
  22. /**
  23. * @file libavcodec/fraps.c
  24. * Lossless Fraps 'FPS1' decoder
  25. * @author Roine Gustafsson <roine at users sf net>
  26. * @author Konstantin Shishkov
  27. *
  28. * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
  29. *
  30. * Version 2 files support by Konstantin Shishkov
  31. */
  32. #include "avcodec.h"
  33. #include "get_bits.h"
  34. #include "huffman.h"
  35. #include "bytestream.h"
  36. #include "dsputil.h"
  37. #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
  38. /**
  39. * local variable storage
  40. */
  41. typedef struct FrapsContext{
  42. AVCodecContext *avctx;
  43. AVFrame frame;
  44. uint8_t *tmpbuf;
  45. DSPContext dsp;
  46. } FrapsContext;
  47. /**
  48. * initializes decoder
  49. * @param avctx codec context
  50. * @return 0 on success or negative if fails
  51. */
  52. static av_cold int decode_init(AVCodecContext *avctx)
  53. {
  54. FrapsContext * const s = avctx->priv_data;
  55. avctx->coded_frame = (AVFrame*)&s->frame;
  56. avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */
  57. s->avctx = avctx;
  58. s->frame.data[0] = NULL;
  59. s->tmpbuf = NULL;
  60. dsputil_init(&s->dsp, avctx);
  61. return 0;
  62. }
  63. /**
  64. * Comparator - our nodes should ascend by count
  65. * but with preserved symbol order
  66. */
  67. static int huff_cmp(const void *va, const void *vb){
  68. const Node *a = va, *b = vb;
  69. return (a->count - b->count)*256 + a->sym - b->sym;
  70. }
  71. /**
  72. * decode Fraps v2 packed plane
  73. */
  74. static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
  75. int h, const uint8_t *src, int size, int Uoff,
  76. const int step)
  77. {
  78. int i, j;
  79. GetBitContext gb;
  80. VLC vlc;
  81. Node nodes[512];
  82. for(i = 0; i < 256; i++)
  83. nodes[i].count = bytestream_get_le32(&src);
  84. size -= 1024;
  85. if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp,
  86. FF_HUFFMAN_FLAG_ZERO_COUNT) < 0)
  87. return -1;
  88. /* we have built Huffman table and are ready to decode plane */
  89. /* convert bits so they may be used by standard bitreader */
  90. s->dsp.bswap_buf((uint32_t *)s->tmpbuf, (const uint32_t *)src, size >> 2);
  91. init_get_bits(&gb, s->tmpbuf, size * 8);
  92. for(j = 0; j < h; j++){
  93. for(i = 0; i < w*step; i += step){
  94. dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
  95. /* lines are stored as deltas between previous lines
  96. * and we need to add 0x80 to the first lines of chroma planes
  97. */
  98. if(j) dst[i] += dst[i - stride];
  99. else if(Uoff) dst[i] += 0x80;
  100. }
  101. dst += stride;
  102. }
  103. free_vlc(&vlc);
  104. return 0;
  105. }
  106. /**
  107. * decode a frame
  108. * @param avctx codec context
  109. * @param data output AVFrame
  110. * @param data_size size of output data or 0 if no picture is returned
  111. * @param buf input data frame
  112. * @param buf_size size of input data frame
  113. * @return number of consumed bytes on success or negative if decode fails
  114. */
  115. static int decode_frame(AVCodecContext *avctx,
  116. void *data, int *data_size,
  117. AVPacket *avpkt)
  118. {
  119. const uint8_t *buf = avpkt->data;
  120. int buf_size = avpkt->size;
  121. FrapsContext * const s = avctx->priv_data;
  122. AVFrame *frame = data;
  123. AVFrame * const f = (AVFrame*)&s->frame;
  124. uint32_t header;
  125. unsigned int version,header_size;
  126. unsigned int x, y;
  127. const uint32_t *buf32;
  128. uint32_t *luma1,*luma2,*cb,*cr;
  129. uint32_t offs[4];
  130. int i, j, is_chroma, planes;
  131. header = AV_RL32(buf);
  132. version = header & 0xff;
  133. header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
  134. if (version > 5) {
  135. av_log(avctx, AV_LOG_ERROR,
  136. "This file is encoded with Fraps version %d. " \
  137. "This codec can only decode versions <= 5.\n", version);
  138. return -1;
  139. }
  140. buf+=4;
  141. if (header_size == 8)
  142. buf+=4;
  143. switch(version) {
  144. case 0:
  145. default:
  146. /* Fraps v0 is a reordered YUV420 */
  147. avctx->pix_fmt = PIX_FMT_YUV420P;
  148. if ( (buf_size != avctx->width*avctx->height*3/2+header_size) &&
  149. (buf_size != header_size) ) {
  150. av_log(avctx, AV_LOG_ERROR,
  151. "Invalid frame length %d (should be %d)\n",
  152. buf_size, avctx->width*avctx->height*3/2+header_size);
  153. return -1;
  154. }
  155. if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) {
  156. av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
  157. avctx->width, avctx->height);
  158. return -1;
  159. }
  160. f->reference = 1;
  161. f->buffer_hints = FF_BUFFER_HINTS_VALID |
  162. FF_BUFFER_HINTS_PRESERVE |
  163. FF_BUFFER_HINTS_REUSABLE;
  164. if (avctx->reget_buffer(avctx, f)) {
  165. av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  166. return -1;
  167. }
  168. /* bit 31 means same as previous pic */
  169. f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
  170. f->key_frame = f->pict_type == FF_I_TYPE;
  171. if (f->pict_type == FF_I_TYPE) {
  172. buf32=(const uint32_t*)buf;
  173. for(y=0; y<avctx->height/2; y++){
  174. luma1=(uint32_t*)&f->data[0][ y*2*f->linesize[0] ];
  175. luma2=(uint32_t*)&f->data[0][ (y*2+1)*f->linesize[0] ];
  176. cr=(uint32_t*)&f->data[1][ y*f->linesize[1] ];
  177. cb=(uint32_t*)&f->data[2][ y*f->linesize[2] ];
  178. for(x=0; x<avctx->width; x+=8){
  179. *(luma1++) = *(buf32++);
  180. *(luma1++) = *(buf32++);
  181. *(luma2++) = *(buf32++);
  182. *(luma2++) = *(buf32++);
  183. *(cr++) = *(buf32++);
  184. *(cb++) = *(buf32++);
  185. }
  186. }
  187. }
  188. break;
  189. case 1:
  190. /* Fraps v1 is an upside-down BGR24 */
  191. avctx->pix_fmt = PIX_FMT_BGR24;
  192. if ( (buf_size != avctx->width*avctx->height*3+header_size) &&
  193. (buf_size != header_size) ) {
  194. av_log(avctx, AV_LOG_ERROR,
  195. "Invalid frame length %d (should be %d)\n",
  196. buf_size, avctx->width*avctx->height*3+header_size);
  197. return -1;
  198. }
  199. f->reference = 1;
  200. f->buffer_hints = FF_BUFFER_HINTS_VALID |
  201. FF_BUFFER_HINTS_PRESERVE |
  202. FF_BUFFER_HINTS_REUSABLE;
  203. if (avctx->reget_buffer(avctx, f)) {
  204. av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  205. return -1;
  206. }
  207. /* bit 31 means same as previous pic */
  208. f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE;
  209. f->key_frame = f->pict_type == FF_I_TYPE;
  210. if (f->pict_type == FF_I_TYPE) {
  211. for(y=0; y<avctx->height; y++)
  212. memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ],
  213. &buf[y*avctx->width*3],
  214. 3*avctx->width);
  215. }
  216. break;
  217. case 2:
  218. case 4:
  219. /**
  220. * Fraps v2 is Huffman-coded YUV420 planes
  221. * Fraps v4 is virtually the same
  222. */
  223. avctx->pix_fmt = PIX_FMT_YUV420P;
  224. planes = 3;
  225. f->reference = 1;
  226. f->buffer_hints = FF_BUFFER_HINTS_VALID |
  227. FF_BUFFER_HINTS_PRESERVE |
  228. FF_BUFFER_HINTS_REUSABLE;
  229. if (avctx->reget_buffer(avctx, f)) {
  230. av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  231. return -1;
  232. }
  233. /* skip frame */
  234. if(buf_size == 8) {
  235. f->pict_type = FF_P_TYPE;
  236. f->key_frame = 0;
  237. break;
  238. }
  239. f->pict_type = FF_I_TYPE;
  240. f->key_frame = 1;
  241. if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
  242. av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
  243. return -1;
  244. }
  245. for(i = 0; i < planes; i++) {
  246. offs[i] = AV_RL32(buf + 4 + i * 4);
  247. if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
  248. av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
  249. return -1;
  250. }
  251. }
  252. offs[planes] = buf_size;
  253. for(i = 0; i < planes; i++){
  254. is_chroma = !!i;
  255. s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
  256. if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
  257. avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma, 1) < 0) {
  258. av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
  259. return -1;
  260. }
  261. }
  262. break;
  263. case 3:
  264. case 5:
  265. /* Virtually the same as version 4, but is for RGB24 */
  266. avctx->pix_fmt = PIX_FMT_BGR24;
  267. planes = 3;
  268. f->reference = 1;
  269. f->buffer_hints = FF_BUFFER_HINTS_VALID |
  270. FF_BUFFER_HINTS_PRESERVE |
  271. FF_BUFFER_HINTS_REUSABLE;
  272. if (avctx->reget_buffer(avctx, f)) {
  273. av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
  274. return -1;
  275. }
  276. /* skip frame */
  277. if(buf_size == 8) {
  278. f->pict_type = FF_P_TYPE;
  279. f->key_frame = 0;
  280. break;
  281. }
  282. f->pict_type = FF_I_TYPE;
  283. f->key_frame = 1;
  284. if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
  285. av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
  286. return -1;
  287. }
  288. for(i = 0; i < planes; i++) {
  289. offs[i] = AV_RL32(buf + 4 + i * 4);
  290. if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
  291. av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
  292. return -1;
  293. }
  294. }
  295. offs[planes] = buf_size;
  296. for(i = 0; i < planes; i++){
  297. s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
  298. if(fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)), -f->linesize[0],
  299. avctx->width, avctx->height, buf + offs[i], offs[i + 1] - offs[i], 0, 3) < 0) {
  300. av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
  301. return -1;
  302. }
  303. }
  304. // convert pseudo-YUV into real RGB
  305. for(j = 0; j < avctx->height; j++){
  306. for(i = 0; i < avctx->width; i++){
  307. f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
  308. f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]];
  309. }
  310. }
  311. break;
  312. }
  313. *frame = *f;
  314. *data_size = sizeof(AVFrame);
  315. return buf_size;
  316. }
  317. /**
  318. * closes decoder
  319. * @param avctx codec context
  320. * @return 0 on success or negative if fails
  321. */
  322. static av_cold int decode_end(AVCodecContext *avctx)
  323. {
  324. FrapsContext *s = (FrapsContext*)avctx->priv_data;
  325. if (s->frame.data[0])
  326. avctx->release_buffer(avctx, &s->frame);
  327. av_freep(&s->tmpbuf);
  328. return 0;
  329. }
  330. AVCodec fraps_decoder = {
  331. "fraps",
  332. CODEC_TYPE_VIDEO,
  333. CODEC_ID_FRAPS,
  334. sizeof(FrapsContext),
  335. decode_init,
  336. NULL,
  337. decode_end,
  338. decode_frame,
  339. CODEC_CAP_DR1,
  340. .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
  341. };