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  1. /*
  2. * RV30 decoder
  3. * Copyright (c) 2007 Konstantin Shishkov
  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. * @file
  23. * RV30 decoder
  24. */
  25. #include "avcodec.h"
  26. #include "mpegvideo.h"
  27. #include "golomb.h"
  28. #include "rv34.h"
  29. #include "rv30data.h"
  30. static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
  31. {
  32. int mb_bits;
  33. int w = r->s.width, h = r->s.height;
  34. int mb_size;
  35. int rpr;
  36. memset(si, 0, sizeof(SliceInfo));
  37. if(get_bits(gb, 3))
  38. return -1;
  39. si->type = get_bits(gb, 2);
  40. if(si->type == 1) si->type = 0;
  41. if(get_bits1(gb))
  42. return -1;
  43. si->quant = get_bits(gb, 5);
  44. skip_bits1(gb);
  45. si->pts = get_bits(gb, 13);
  46. rpr = get_bits(gb, r->rpr);
  47. if (r->s.avctx->extradata_size < 8 + rpr*2) {
  48. av_log(r->s.avctx, AV_LOG_WARNING,
  49. "Extradata does not contain selected resolution\n");
  50. rpr = 0;
  51. }
  52. if(rpr){
  53. w = r->s.avctx->extradata[6 + rpr*2] << 2;
  54. h = r->s.avctx->extradata[7 + rpr*2] << 2;
  55. }
  56. si->width = w;
  57. si->height = h;
  58. mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
  59. mb_bits = ff_rv34_get_start_offset(gb, mb_size);
  60. si->start = get_bits(gb, mb_bits);
  61. skip_bits1(gb);
  62. return 0;
  63. }
  64. /**
  65. * Decode 4x4 intra types array.
  66. */
  67. static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
  68. {
  69. int i, j, k;
  70. for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
  71. for(j = 0; j < 4; j+= 2){
  72. unsigned code = svq3_get_ue_golomb(gb) << 1;
  73. if (code > 80U*2U) {
  74. av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
  75. return -1;
  76. }
  77. for(k = 0; k < 2; k++){
  78. int A = dst[-r->intra_types_stride] + 1;
  79. int B = dst[-1] + 1;
  80. *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
  81. if(dst[-1] == 9){
  82. av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
  83. return -1;
  84. }
  85. }
  86. }
  87. }
  88. return 0;
  89. }
  90. /**
  91. * Decode macroblock information.
  92. */
  93. static int rv30_decode_mb_info(RV34DecContext *r)
  94. {
  95. static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
  96. static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
  97. MpegEncContext *s = &r->s;
  98. GetBitContext *gb = &s->gb;
  99. unsigned code = svq3_get_ue_golomb(gb);
  100. if (code > 11) {
  101. av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
  102. return -1;
  103. }
  104. if(code > 5){
  105. av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
  106. code -= 6;
  107. }
  108. if(s->pict_type != AV_PICTURE_TYPE_B)
  109. return rv30_p_types[code];
  110. else
  111. return rv30_b_types[code];
  112. }
  113. static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
  114. const int stride, const int lim)
  115. {
  116. const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
  117. int i, diff;
  118. for(i = 0; i < 4; i++){
  119. diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
  120. diff = av_clip(diff, -lim, lim);
  121. src[-1*step] = cm[src[-1*step] + diff];
  122. src[ 0*step] = cm[src[ 0*step] - diff];
  123. src += stride;
  124. }
  125. }
  126. static void rv30_loop_filter(RV34DecContext *r, int row)
  127. {
  128. MpegEncContext *s = &r->s;
  129. int mb_pos, mb_x;
  130. int i, j, k;
  131. uint8_t *Y, *C;
  132. int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
  133. mb_pos = row * s->mb_stride;
  134. for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
  135. int mbtype = s->current_picture_ptr->mb_type[mb_pos];
  136. if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
  137. r->deblock_coefs[mb_pos] = 0xFFFF;
  138. if(IS_INTRA(mbtype))
  139. r->cbp_chroma[mb_pos] = 0xFF;
  140. }
  141. /* all vertical edges are filtered first
  142. * and horizontal edges are filtered on the next iteration
  143. */
  144. mb_pos = row * s->mb_stride;
  145. for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
  146. cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
  147. if(mb_x)
  148. left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
  149. for(j = 0; j < 16; j += 4){
  150. Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
  151. for(i = !mb_x; i < 4; i++, Y += 4){
  152. int ij = i + j;
  153. loc_lim = 0;
  154. if(r->deblock_coefs[mb_pos] & (1 << ij))
  155. loc_lim = cur_lim;
  156. else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
  157. loc_lim = left_lim;
  158. else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
  159. loc_lim = cur_lim;
  160. if(loc_lim)
  161. rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
  162. }
  163. }
  164. for(k = 0; k < 2; k++){
  165. int cur_cbp, left_cbp = 0;
  166. cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
  167. if(mb_x)
  168. left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
  169. for(j = 0; j < 8; j += 4){
  170. C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
  171. for(i = !mb_x; i < 2; i++, C += 4){
  172. int ij = i + (j >> 1);
  173. loc_lim = 0;
  174. if (cur_cbp & (1 << ij))
  175. loc_lim = cur_lim;
  176. else if(!i && left_cbp & (1 << (ij + 1)))
  177. loc_lim = left_lim;
  178. else if( i && cur_cbp & (1 << (ij - 1)))
  179. loc_lim = cur_lim;
  180. if(loc_lim)
  181. rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
  182. }
  183. }
  184. }
  185. }
  186. mb_pos = row * s->mb_stride;
  187. for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
  188. cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
  189. if(row)
  190. top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
  191. for(j = 4*!row; j < 16; j += 4){
  192. Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
  193. for(i = 0; i < 4; i++, Y += 4){
  194. int ij = i + j;
  195. loc_lim = 0;
  196. if(r->deblock_coefs[mb_pos] & (1 << ij))
  197. loc_lim = cur_lim;
  198. else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
  199. loc_lim = top_lim;
  200. else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
  201. loc_lim = cur_lim;
  202. if(loc_lim)
  203. rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
  204. }
  205. }
  206. for(k = 0; k < 2; k++){
  207. int cur_cbp, top_cbp = 0;
  208. cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
  209. if(row)
  210. top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
  211. for(j = 4*!row; j < 8; j += 4){
  212. C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
  213. for(i = 0; i < 2; i++, C += 4){
  214. int ij = i + (j >> 1);
  215. loc_lim = 0;
  216. if (r->cbp_chroma[mb_pos] & (1 << ij))
  217. loc_lim = cur_lim;
  218. else if(!j && top_cbp & (1 << (ij + 2)))
  219. loc_lim = top_lim;
  220. else if( j && cur_cbp & (1 << (ij - 2)))
  221. loc_lim = cur_lim;
  222. if(loc_lim)
  223. rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
  224. }
  225. }
  226. }
  227. }
  228. }
  229. /**
  230. * Initialize decoder.
  231. */
  232. static av_cold int rv30_decode_init(AVCodecContext *avctx)
  233. {
  234. RV34DecContext *r = avctx->priv_data;
  235. int ret;
  236. r->rv30 = 1;
  237. if ((ret = ff_rv34_decode_init(avctx)) < 0)
  238. return ret;
  239. if(avctx->extradata_size < 2){
  240. av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
  241. return -1;
  242. }
  243. r->rpr = (avctx->extradata[1] & 7) >> 1;
  244. r->rpr = FFMIN(r->rpr + 1, 3);
  245. if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
  246. av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
  247. 6 + r->rpr * 2, avctx->extradata_size);
  248. }
  249. r->parse_slice_header = rv30_parse_slice_header;
  250. r->decode_intra_types = rv30_decode_intra_types;
  251. r->decode_mb_info = rv30_decode_mb_info;
  252. r->loop_filter = rv30_loop_filter;
  253. r->luma_dc_quant_i = rv30_luma_dc_quant;
  254. r->luma_dc_quant_p = rv30_luma_dc_quant;
  255. return 0;
  256. }
  257. AVCodec ff_rv30_decoder = {
  258. .name = "rv30",
  259. .type = AVMEDIA_TYPE_VIDEO,
  260. .id = AV_CODEC_ID_RV30,
  261. .priv_data_size = sizeof(RV34DecContext),
  262. .init = rv30_decode_init,
  263. .close = ff_rv34_decode_end,
  264. .decode = ff_rv34_decode_frame,
  265. .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
  266. CODEC_CAP_FRAME_THREADS,
  267. .flush = ff_mpeg_flush,
  268. .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
  269. .pix_fmts = ff_pixfmt_list_420,
  270. .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
  271. .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
  272. };