FFmpeg: libavcodec/cavs.c Source File

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libavcodec

cavs.c

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1 /*

2 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.

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 */

22 /**

23 * @file

24 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder

25 * @author Stefan Gehrer <stefan.gehrer@gmx.de>

26 */

28 #include "avcodec.h"

29 #include "get_bits.h"

30 #include "golomb.h"

31 #include "h264chroma.h"

32 #include "mathops.h"

33 #include "cavs.h"

35 static const uint8_t alpha_tab[64] = {

36 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3,

37 4, 4, 5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 18, 20,

38 22, 24, 26, 28, 30, 33, 33, 35, 35, 36, 37, 37, 39, 39, 42, 44,

39 46, 48, 50, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64

40 };

42 static const uint8_t beta_tab[64] = {

43 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2,

44 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6,

45 6, 7, 7, 7, 8, 8, 8, 9, 9, 10, 10, 11, 11, 12, 13, 14,

46 15, 16, 17, 18, 19, 20, 21, 22, 23, 23, 24, 24, 25, 25, 26, 27

47 };

49 static const uint8_t tc_tab[64] = {

50 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

51 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2,

52 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4,

53 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9

54 };

56 /** mark block as unavailable, i.e. out of picture

57 or not yet decoded */

58 static const cavs_vector un_mv = { 0, 0, 1, NOT_AVAIL };

60 static const int8_t left_modifier_l[8] = { 0, -1, 6, -1, -1, 7, 6, 7 };

61 static const int8_t top_modifier_l[8] = { -1, 1, 5, -1, -1, 5, 7, 7 };

62 static const int8_t left_modifier_c[7] = { 5, -1, 2, -1, 6, 5, 6 };

63 static const int8_t top_modifier_c[7] = { 4, 1, -1, -1, 4, 6, 6 };

65 /*****************************************************************************

66 *

67 * in-loop deblocking filter

68 *

69 ****************************************************************************/

71 static inline int get_bs(cavs_vector *mvP, cavs_vector *mvQ, int b)

72 {

73 if ((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA))

74 return 2;

75 if ((abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4))

76 return 1;

77 if (b) {

78 mvP += MV_BWD_OFFS;

79 mvQ += MV_BWD_OFFS;

80 if ((abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4))

81 return 1;

82 } else {

83 if (mvP->ref != mvQ->ref)

84 return 1;

85 }

86 return 0;

87 }

89 #define SET_PARAMS \

90 alpha = alpha_tab[av_clip(qp_avg + h->alpha_offset, 0, 63)]; \

91 beta = beta_tab[av_clip(qp_avg + h->beta_offset, 0, 63)]; \

92 tc = tc_tab[av_clip(qp_avg + h->alpha_offset, 0, 63)];

94 /**

95 * in-loop deblocking filter for a single macroblock

96 *

97 * boundary strength (bs) mapping:

98 *

99 * --4---5--

100 * 0 2 |

101 * | 6 | 7 |

102 * 1 3 |

103 * ---------

104 *

105 */

106 void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type)

107 {

108 uint8_t bs[8];

109 int qp_avg, alpha, beta, tc;

110 int i;

111

112 /* save un-deblocked lines */

113 h->topleft_border_y = h->top_border_y[h->mbx * 16 + 15];

114 h->topleft_border_u = h->top_border_u[h->mbx * 10 + 8];

115 h->topleft_border_v = h->top_border_v[h->mbx * 10 + 8];

116 memcpy(&h->top_border_y[h->mbx * 16], h->cy + 15 * h->l_stride, 16);

117 memcpy(&h->top_border_u[h->mbx * 10 + 1], h->cu + 7 * h->c_stride, 8);

118 memcpy(&h->top_border_v[h->mbx * 10 + 1], h->cv + 7 * h->c_stride, 8);

119 for (i = 0; i < 8; i++) {

120 h->left_border_y[i * 2 + 1] = *(h->cy + 15 + (i * 2 + 0) * h->l_stride);

121 h->left_border_y[i * 2 + 2] = *(h->cy + 15 + (i * 2 + 1) * h->l_stride);

122 h->left_border_u[i + 1] = *(h->cu + 7 + i * h->c_stride);

123 h->left_border_v[i + 1] = *(h->cv + 7 + i * h->c_stride);

124 }

125 if (!h->loop_filter_disable) {

126 /* determine bs */

127 if (mb_type == I_8X8)

128 memset(bs, 2, 8);

129 else{

130 memset(bs, 0, 8);

131 if (ff_cavs_partition_flags[mb_type] & SPLITV) {

132 bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8);

133 bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8);

134 }

135 if (ff_cavs_partition_flags[mb_type] & SPLITH) {

136 bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8);

137 bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8);

138 }

139 bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8);

140 bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8);

141 bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8);

142 bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8);

143 }

144 if (AV_RN64(bs)) {

145 if (h->flags & A_AVAIL) {

146 qp_avg = (h->qp + h->left_qp + 1) >> 1;

147 SET_PARAMS;

148 h->cdsp.cavs_filter_lv(h->cy, h->l_stride, alpha, beta, tc, bs[0], bs[1]);

149 h->cdsp.cavs_filter_cv(h->cu, h->c_stride, alpha, beta, tc, bs[0], bs[1]);

150 h->cdsp.cavs_filter_cv(h->cv, h->c_stride, alpha, beta, tc, bs[0], bs[1]);

151 }

152 qp_avg = h->qp;

153 SET_PARAMS;

154 h->cdsp.cavs_filter_lv(h->cy + 8, h->l_stride, alpha, beta, tc, bs[2], bs[3]);

155 h->cdsp.cavs_filter_lh(h->cy + 8 * h->l_stride, h->l_stride, alpha, beta, tc, bs[6], bs[7]);

156

157 if (h->flags & B_AVAIL) {

158 qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1;

159 SET_PARAMS;

160 h->cdsp.cavs_filter_lh(h->cy, h->l_stride, alpha, beta, tc, bs[4], bs[5]);

161 h->cdsp.cavs_filter_ch(h->cu, h->c_stride, alpha, beta, tc, bs[4], bs[5]);

162 h->cdsp.cavs_filter_ch(h->cv, h->c_stride, alpha, beta, tc, bs[4], bs[5]);

163 }

164 }

165 }

166 h->left_qp = h->qp;

167 h->top_qp[h->mbx] = h->qp;

168 }

169

170 #undef SET_PARAMS

171

172 /*****************************************************************************

173 *

174 * spatial intra prediction

175 *

176 ****************************************************************************/

177

178 void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top,

179 uint8_t **left, int block)

180 {

181 int i;

182

183 switch (block) {

184 case 0:

185 *left = h->left_border_y;

186 h->left_border_y[0] = h->left_border_y[1];

187 memset(&h->left_border_y[17], h->left_border_y[16], 9);

188 memcpy(&top[1], &h->top_border_y[h->mbx * 16], 16);

189 top[17] = top[16];

190 top[0] = top[1];

191 if ((h->flags & A_AVAIL) && (h->flags & B_AVAIL))

192 h->left_border_y[0] = top[0] = h->topleft_border_y;

193 break;

194 case 1:

195 *left = h->intern_border_y;

196 for (i = 0; i < 8; i++)

197 h->intern_border_y[i + 1] = *(h->cy + 7 + i * h->l_stride);

198 memset(&h->intern_border_y[9], h->intern_border_y[8], 9);

199 h->intern_border_y[0] = h->intern_border_y[1];

200 memcpy(&top[1], &h->top_border_y[h->mbx * 16 + 8], 8);

201 if (h->flags & C_AVAIL)

202 memcpy(&top[9], &h->top_border_y[(h->mbx + 1) * 16], 8);

203 else

204 memset(&top[9], top[8], 9);

205 top[17] = top[16];

206 top[0] = top[1];

207 if (h->flags & B_AVAIL)

208 h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx * 16 + 7];

209 break;

210 case 2:

211 *left = &h->left_border_y[8];

212 memcpy(&top[1], h->cy + 7 * h->l_stride, 16);

213 top[17] = top[16];

214 top[0] = top[1];

215 if (h->flags & A_AVAIL)

216 top[0] = h->left_border_y[8];

217 break;

218 case 3:

219 *left = &h->intern_border_y[8];

220 for (i = 0; i < 8; i++)

221 h->intern_border_y[i + 9] = *(h->cy + 7 + (i + 8) * h->l_stride);

222 memset(&h->intern_border_y[17], h->intern_border_y[16], 9);

223 memcpy(&top[0], h->cy + 7 + 7 * h->l_stride, 9);

224 memset(&top[9], top[8], 9);

225 break;

226 }

227 }

228

229 void ff_cavs_load_intra_pred_chroma(AVSContext *h)

230 {

231 /* extend borders by one pixel */

232 h->left_border_u[9] = h->left_border_u[8];

233 h->left_border_v[9] = h->left_border_v[8];

234 h->top_border_u[h->mbx * 10 + 9] = h->top_border_u[h->mbx * 10 + 8];

235 h->top_border_v[h->mbx * 10 + 9] = h->top_border_v[h->mbx * 10 + 8];

236 if (h->mbx && h->mby) {

237 h->top_border_u[h->mbx * 10] = h->left_border_u[0] = h->topleft_border_u;

238 h->top_border_v[h->mbx * 10] = h->left_border_v[0] = h->topleft_border_v;

239 } else {

240 h->left_border_u[0] = h->left_border_u[1];

241 h->left_border_v[0] = h->left_border_v[1];

242 h->top_border_u[h->mbx * 10] = h->top_border_u[h->mbx * 10 + 1];

243 h->top_border_v[h->mbx * 10] = h->top_border_v[h->mbx * 10 + 1];

244 }

245 }

246

247 static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

248 {

249 int y;

250 uint64_t a = AV_RN64(&top[1]);

251 for (y = 0; y < 8; y++) {

252 *((uint64_t *)(d + y * stride)) = a;

253 }

254 }

255

256 static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

257 {

258 int y;

259 uint64_t a;

260 for (y = 0; y < 8; y++) {

261 a = left[y + 1] * 0x0101010101010101ULL;

262 *((uint64_t *)(d + y * stride)) = a;

263 }

264 }

265

266 static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

267 {

268 int y;

269 uint64_t a = 0x8080808080808080ULL;

270 for (y = 0; y < 8; y++)

271 *((uint64_t *)(d + y * stride)) = a;

272 }

273

274 static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

275 {

276 int x, y, ia;

277 int ih = 0;

278 int iv = 0;

279 const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

280

281 for (x = 0; x < 4; x++) {

282 ih += (x + 1) * (top [5 + x] - top [3 - x]);

283 iv += (x + 1) * (left[5 + x] - left[3 - x]);

284 }

285 ia = (top[8] + left[8]) << 4;

286 ih = (17 * ih + 16) >> 5;

287 iv = (17 * iv + 16) >> 5;

288 for (y = 0; y < 8; y++)

289 for (x = 0; x < 8; x++)

290 d[y * stride + x] = cm[(ia + (x - 3) * ih + (y - 3) * iv + 16) >> 5];

291 }

292

293 #define LOWPASS(ARRAY,INDEX) \

294 ((ARRAY[(INDEX) - 1] + 2 * ARRAY[(INDEX)] + ARRAY[(INDEX) + 1] + 2) >> 2)

295

296 static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

297 {

298 int x, y;

299 for (y = 0; y < 8; y++)

300 for (x = 0; x < 8; x++)

301 d[y * stride + x] = (LOWPASS(top, x + 1) + LOWPASS(left, y + 1)) >> 1;

302 }

303

304 static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

305 {

306 int x, y;

307 for (y = 0; y < 8; y++)

308 for (x = 0; x < 8; x++)

309 d[y * stride + x] = (LOWPASS(top, x + y + 2) + LOWPASS(left, x + y + 2)) >> 1;

310 }

311

312 static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

313 {

314 int x, y;

315 for (y = 0; y < 8; y++)

316 for (x = 0; x < 8; x++)

317 if (x == y)

318 d[y * stride + x] = (left[1] + 2 * top[0] + top[1] + 2) >> 2;

319 else if (x > y)

320 d[y * stride + x] = LOWPASS(top, x - y);

321 else

322 d[y * stride + x] = LOWPASS(left, y - x);

323 }

324

325 static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

326 {

327 int x, y;

328 for (y = 0; y < 8; y++)

329 for (x = 0; x < 8; x++)

330 d[y * stride + x] = LOWPASS(left, y + 1);

331 }

332

333 static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride)

334 {

335 int x, y;

336 for (y = 0; y < 8; y++)

337 for (x = 0; x < 8; x++)

338 d[y * stride + x] = LOWPASS(top, x + 1);

339 }

340

341 #undef LOWPASS

342

343 static inline void modify_pred(const int8_t *mod_table, int *mode)

344 {

345 *mode = mod_table[*mode];

346 if (*mode < 0) {

347 av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");

348 *mode = 0;

349 }

350 }

351

352 void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv)

353 {

354 /* save pred modes before they get modified */

355 h->pred_mode_Y[3] = h->pred_mode_Y[5];

356 h->pred_mode_Y[6] = h->pred_mode_Y[8];

357 h->top_pred_Y[h->mbx * 2 + 0] = h->pred_mode_Y[7];

358 h->top_pred_Y[h->mbx * 2 + 1] = h->pred_mode_Y[8];

359

360 /* modify pred modes according to availability of neighbour samples */

361 if (!(h->flags & A_AVAIL)) {

362 modify_pred(left_modifier_l, &h->pred_mode_Y[4]);

363 modify_pred(left_modifier_l, &h->pred_mode_Y[7]);

364 modify_pred(left_modifier_c, pred_mode_uv);

365 }

366 if (!(h->flags & B_AVAIL)) {

367 modify_pred(top_modifier_l, &h->pred_mode_Y[4]);

368 modify_pred(top_modifier_l, &h->pred_mode_Y[5]);

369 modify_pred(top_modifier_c, pred_mode_uv);

370 }

371 }

372

373 /*****************************************************************************

374 *

375 * motion compensation

376 *

377 ****************************************************************************/

378

379 static inline void mc_dir_part(AVSContext *h, AVFrame *pic,

380 int chroma_height,int delta,int list,uint8_t *dest_y,

381 uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset,

382 int src_y_offset,qpel_mc_func *qpix_op,

383 h264_chroma_mc_func chroma_op,cavs_vector *mv)

384 {

385 const int mx= mv->x + src_x_offset*8;

386 const int my= mv->y + src_y_offset*8;

387 const int luma_xy= (mx&3) + ((my&3)<<2);

388 uint8_t * src_y = pic->data[0] + (mx >> 2) + (my >> 2) * h->l_stride;

389 uint8_t * src_cb = pic->data[1] + (mx >> 3) + (my >> 3) * h->c_stride;

390 uint8_t * src_cr = pic->data[2] + (mx >> 3) + (my >> 3) * h->c_stride;

391 int extra_width = 0;

392 int extra_height= extra_width;

393 int emu=0;

394 const int full_mx= mx>>2;

395 const int full_my= my>>2;

396 const int pic_width = 16*h->mb_width;

397 const int pic_height = 16*h->mb_height;

398

399 if (!pic->data[0])

400 return;

401 if(mx&7) extra_width -= 3;

402 if(my&7) extra_height -= 3;

403

404 if( full_mx < 0-extra_width

405 || full_my < 0-extra_height

406 || full_mx + 16/*FIXME*/ > pic_width + extra_width

407 || full_my + 16/*FIXME*/ > pic_height + extra_height){

408 h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride,

409 16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

410 src_y= h->edge_emu_buffer + 2 + 2*h->l_stride;

411 emu=1;

412 }

413

414 qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?

415

416 if(emu){

417 h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src_cb, h->c_stride,

418 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

419 src_cb= h->edge_emu_buffer;

420 }

421 chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);

422

423 if(emu){

424 h->vdsp.emulated_edge_mc(h->edge_emu_buffer, src_cr, h->c_stride,

425 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

426 src_cr= h->edge_emu_buffer;

427 }

428 chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);

429 }

430

431 static inline void mc_part_std(AVSContext *h,int chroma_height,int delta,

432 uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

433 int x_offset, int y_offset,qpel_mc_func *qpix_put,

434 h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

435 h264_chroma_mc_func chroma_avg, cavs_vector *mv)

436 {

437 qpel_mc_func *qpix_op= qpix_put;

438 h264_chroma_mc_func chroma_op= chroma_put;

439

440 dest_y += 2*x_offset + 2*y_offset*h->l_stride;

441 dest_cb += x_offset + y_offset*h->c_stride;

442 dest_cr += x_offset + y_offset*h->c_stride;

443 x_offset += 8*h->mbx;

444 y_offset += 8*h->mby;

445

446 if(mv->ref >= 0){

447 AVFrame *ref = h->DPB[mv->ref].f;

448 mc_dir_part(h, ref, chroma_height, delta, 0,

449 dest_y, dest_cb, dest_cr, x_offset, y_offset,

450 qpix_op, chroma_op, mv);

451

452 qpix_op= qpix_avg;

453 chroma_op= chroma_avg;

454 }

455

456 if((mv+MV_BWD_OFFS)->ref >= 0){

457 AVFrame *ref = h->DPB[0].f;

458 mc_dir_part(h, ref, chroma_height, delta, 1,

459 dest_y, dest_cb, dest_cr, x_offset, y_offset,

460 qpix_op, chroma_op, mv+MV_BWD_OFFS);

461 }

462 }

463

464 void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type) {

465 if(ff_cavs_partition_flags[mb_type] == 0){ // 16x16

466 mc_part_std(h, 8, 0, h->cy, h->cu, h->cv, 0, 0,

467 h->cdsp.put_cavs_qpel_pixels_tab[0],

468 h->h264chroma.put_h264_chroma_pixels_tab[0],

469 h->cdsp.avg_cavs_qpel_pixels_tab[0],

470 h->h264chroma.avg_h264_chroma_pixels_tab[0],

471 &h->mv[MV_FWD_X0]);

472 }else{

473 mc_part_std(h, 4, 0, h->cy, h->cu, h->cv, 0, 0,

474 h->cdsp.put_cavs_qpel_pixels_tab[1],

475 h->h264chroma.put_h264_chroma_pixels_tab[1],

476 h->cdsp.avg_cavs_qpel_pixels_tab[1],

477 h->h264chroma.avg_h264_chroma_pixels_tab[1],

478 &h->mv[MV_FWD_X0]);

479 mc_part_std(h, 4, 0, h->cy, h->cu, h->cv, 4, 0,

480 h->cdsp.put_cavs_qpel_pixels_tab[1],

481 h->h264chroma.put_h264_chroma_pixels_tab[1],

482 h->cdsp.avg_cavs_qpel_pixels_tab[1],

483 h->h264chroma.avg_h264_chroma_pixels_tab[1],

484 &h->mv[MV_FWD_X1]);

485 mc_part_std(h, 4, 0, h->cy, h->cu, h->cv, 0, 4,

486 h->cdsp.put_cavs_qpel_pixels_tab[1],

487 h->h264chroma.put_h264_chroma_pixels_tab[1],

488 h->cdsp.avg_cavs_qpel_pixels_tab[1],

489 h->h264chroma.avg_h264_chroma_pixels_tab[1],

490 &h->mv[MV_FWD_X2]);

491 mc_part_std(h, 4, 0, h->cy, h->cu, h->cv, 4, 4,

492 h->cdsp.put_cavs_qpel_pixels_tab[1],

493 h->h264chroma.put_h264_chroma_pixels_tab[1],

494 h->cdsp.avg_cavs_qpel_pixels_tab[1],

495 h->h264chroma.avg_h264_chroma_pixels_tab[1],

496 &h->mv[MV_FWD_X3]);

497 }

498 }

499

500 /*****************************************************************************

501 *

502 * motion vector prediction

503 *

504 ****************************************************************************/

505

506 static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, cavs_vector *src, int distp) {

507 int den = h->scale_den[src->ref];

508

509 *d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9;

510 *d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9;

511 }

512

513 static inline void mv_pred_median(AVSContext *h, cavs_vector *mvP,

514 cavs_vector *mvA, cavs_vector *mvB, cavs_vector *mvC) {

515 int ax, ay, bx, by, cx, cy;

516 int len_ab, len_bc, len_ca, len_mid;

517

518 /* scale candidates according to their temporal span */

519 scale_mv(h, &ax, &ay, mvA, mvP->dist);

520 scale_mv(h, &bx, &by, mvB, mvP->dist);

521 scale_mv(h, &cx, &cy, mvC, mvP->dist);

522 /* find the geometrical median of the three candidates */

523 len_ab = abs(ax - bx) + abs(ay - by);

524 len_bc = abs(bx - cx) + abs(by - cy);

525 len_ca = abs(cx - ax) + abs(cy - ay);

526 len_mid = mid_pred(len_ab, len_bc, len_ca);

527 if(len_mid == len_ab) {

528 mvP->x = cx;

529 mvP->y = cy;

530 } else if(len_mid == len_bc) {

531 mvP->x = ax;

532 mvP->y = ay;

533 } else {

534 mvP->x = bx;

535 mvP->y = by;

536 }

537 }

538

539 void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,

540 enum cavs_mv_pred mode, enum cavs_block size, int ref) {

541 cavs_vector *mvP = &h->mv[nP];

542 cavs_vector *mvA = &h->mv[nP-1];

543 cavs_vector *mvB = &h->mv[nP-4];

544 cavs_vector *mvC = &h->mv[nC];

545 const cavs_vector *mvP2 = NULL;

546

547 mvP->ref = ref;

548 mvP->dist = h->dist[mvP->ref];

549 if(mvC->ref == NOT_AVAIL)

550 mvC = &h->mv[nP-5]; // set to top-left (mvD)

551 if((mode == MV_PRED_PSKIP) &&

552 ((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||

553 ((mvA->x | mvA->y | mvA->ref) == 0) ||

554 ((mvB->x | mvB->y | mvB->ref) == 0) )) {

555 mvP2 = &un_mv;

556 /* if there is only one suitable candidate, take it */

557 } else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {

558 mvP2= mvA;

559 } else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) {

560 mvP2= mvB;

561 } else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) {

562 mvP2= mvC;

563 } else if(mode == MV_PRED_LEFT && mvA->ref == ref){

564 mvP2= mvA;

565 } else if(mode == MV_PRED_TOP && mvB->ref == ref){

566 mvP2= mvB;

567 } else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){

568 mvP2= mvC;

569 }

570 if(mvP2){

571 mvP->x = mvP2->x;

572 mvP->y = mvP2->y;

573 }else

574 mv_pred_median(h, mvP, mvA, mvB, mvC);

575

576 if(mode < MV_PRED_PSKIP) {

577 mvP->x += get_se_golomb(&h->gb);

578 mvP->y += get_se_golomb(&h->gb);

579 }

580 set_mvs(mvP,size);

581 }

582

583 /*****************************************************************************

584 *

585 * macroblock level

586 *

587 ****************************************************************************/

588

589 /**

590 * initialise predictors for motion vectors and intra prediction

591 */

592 void ff_cavs_init_mb(AVSContext *h) {

593 int i;

594

595 /* copy predictors from top line (MB B and C) into cache */

596 for(i=0;i<3;i++) {

597 h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];

598 h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];

599 }

600 h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];

601 h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];

602 /* clear top predictors if MB B is not available */

603 if(!(h->flags & B_AVAIL)) {

604 h->mv[MV_FWD_B2] = un_mv;

605 h->mv[MV_FWD_B3] = un_mv;

606 h->mv[MV_BWD_B2] = un_mv;

607 h->mv[MV_BWD_B3] = un_mv;

608 h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;

609 h->flags &= ~(C_AVAIL|D_AVAIL);

610 } else if(h->mbx) {

611 h->flags |= D_AVAIL;

612 }

613 if(h->mbx == h->mb_width-1) //MB C not available

614 h->flags &= ~C_AVAIL;

615 /* clear top-right predictors if MB C is not available */

616 if(!(h->flags & C_AVAIL)) {

617 h->mv[MV_FWD_C2] = un_mv;

618 h->mv[MV_BWD_C2] = un_mv;

619 }

620 /* clear top-left predictors if MB D is not available */

621 if(!(h->flags & D_AVAIL)) {

622 h->mv[MV_FWD_D3] = un_mv;

623 h->mv[MV_BWD_D3] = un_mv;

624 }

625 }

626

627 /**

628 * save predictors for later macroblocks and increase

629 * macroblock address

630 * @return 0 if end of frame is reached, 1 otherwise

631 */

632 int ff_cavs_next_mb(AVSContext *h) {

633 int i;

634

635 h->flags |= A_AVAIL;

636 h->cy += 16;

637 h->cu += 8;

638 h->cv += 8;

639 /* copy mvs as predictors to the left */

640 for(i=0;i<=20;i+=4)

641 h->mv[i] = h->mv[i+2];

642 /* copy bottom mvs from cache to top line */

643 h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];

644 h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];

645 h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];

646 h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];

647 /* next MB address */

648 h->mbidx++;

649 h->mbx++;

650 if(h->mbx == h->mb_width) { //new mb line

651 h->flags = B_AVAIL|C_AVAIL;

652 /* clear left pred_modes */

653 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

654 /* clear left mv predictors */

655 for(i=0;i<=20;i+=4)

656 h->mv[i] = un_mv;

657 h->mbx = 0;

658 h->mby++;

659 /* re-calculate sample pointers */

660 h->cy = h->cur.f->data[0] + h->mby * 16 * h->l_stride;

661 h->cu = h->cur.f->data[1] + h->mby * 8 * h->c_stride;

662 h->cv = h->cur.f->data[2] + h->mby * 8 * h->c_stride;

663 if(h->mby == h->mb_height) { //frame end

664 return 0;

665 }

666 }

667 return 1;

668 }

669

670 /*****************************************************************************

671 *

672 * frame level

673 *

674 ****************************************************************************/

675

676 int ff_cavs_init_pic(AVSContext *h) {

677 int i;

678

679 /* clear some predictors */

680 for(i=0;i<=20;i+=4)

681 h->mv[i] = un_mv;

682 h->mv[MV_BWD_X0] = ff_cavs_dir_mv;

683 set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

684 h->mv[MV_FWD_X0] = ff_cavs_dir_mv;

685 set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

686 h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

687 h->cy = h->cur.f->data[0];

688 h->cu = h->cur.f->data[1];

689 h->cv = h->cur.f->data[2];

690 h->l_stride = h->cur.f->linesize[0];

691 h->c_stride = h->cur.f->linesize[1];

692 h->luma_scan[2] = 8*h->l_stride;

693 h->luma_scan[3] = 8*h->l_stride+8;

694 h->mbx = h->mby = h->mbidx = 0;

695 h->flags = 0;

696

697 return 0;

698 }

699

700 /*****************************************************************************

701 *

702 * headers and interface

703 *

704 ****************************************************************************/

705

706 /**

707 * some predictions require data from the top-neighbouring macroblock.

708 * this data has to be stored for one complete row of macroblocks

709 * and this storage space is allocated here

710 */

711 void ff_cavs_init_top_lines(AVSContext *h) {

712 /* alloc top line of predictors */

713 h->top_qp = av_mallocz( h->mb_width);

714 h->top_mv[0] = av_mallocz((h->mb_width*2+1)*sizeof(cavs_vector));

715 h->top_mv[1] = av_mallocz((h->mb_width*2+1)*sizeof(cavs_vector));

716 h->top_pred_Y = av_mallocz( h->mb_width*2*sizeof(*h->top_pred_Y));

717 h->top_border_y = av_mallocz((h->mb_width+1)*16);

718 h->top_border_u = av_mallocz( h->mb_width * 10);

719 h->top_border_v = av_mallocz( h->mb_width * 10);

720

721 /* alloc space for co-located MVs and types */

722 h->col_mv = av_mallocz( h->mb_width*h->mb_height*4*sizeof(cavs_vector));

723 h->col_type_base = av_mallocz(h->mb_width*h->mb_height);

724 h->block = av_mallocz(64*sizeof(int16_t));

725 }

726

727 av_cold int ff_cavs_init(AVCodecContext *avctx) {

728 AVSContext *h = avctx->priv_data;

729

730 ff_dsputil_init(&h->dsp, avctx);

731 ff_h264chroma_init(&h->h264chroma, 8);

732 ff_videodsp_init(&h->vdsp, 8);

733 ff_cavsdsp_init(&h->cdsp, avctx);

734 ff_init_scantable_permutation(h->dsp.idct_permutation,

735 h->cdsp.idct_perm);

736 ff_init_scantable(h->dsp.idct_permutation, &h->scantable, ff_zigzag_direct);

737

738 h->avctx = avctx;

739 avctx->pix_fmt= AV_PIX_FMT_YUV420P;

740

741 h->cur.f = av_frame_alloc();

742 h->DPB[0].f = av_frame_alloc();

743 h->DPB[1].f = av_frame_alloc();

744 if (!h->cur.f || !h->DPB[0].f || !h->DPB[1].f) {

745 ff_cavs_end(avctx);

746 return AVERROR(ENOMEM);

747 }

748

749 h->luma_scan[0] = 0;

750 h->luma_scan[1] = 8;

751 h->intra_pred_l[ INTRA_L_VERT] = intra_pred_vert;

752 h->intra_pred_l[ INTRA_L_HORIZ] = intra_pred_horiz;

753 h->intra_pred_l[ INTRA_L_LP] = intra_pred_lp;

754 h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

755 h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

756 h->intra_pred_l[ INTRA_L_LP_LEFT] = intra_pred_lp_left;

757 h->intra_pred_l[ INTRA_L_LP_TOP] = intra_pred_lp_top;

758 h->intra_pred_l[ INTRA_L_DC_128] = intra_pred_dc_128;

759 h->intra_pred_c[ INTRA_C_LP] = intra_pred_lp;

760 h->intra_pred_c[ INTRA_C_HORIZ] = intra_pred_horiz;

761 h->intra_pred_c[ INTRA_C_VERT] = intra_pred_vert;

762 h->intra_pred_c[ INTRA_C_PLANE] = intra_pred_plane;

763 h->intra_pred_c[ INTRA_C_LP_LEFT] = intra_pred_lp_left;

764 h->intra_pred_c[ INTRA_C_LP_TOP] = intra_pred_lp_top;

765 h->intra_pred_c[ INTRA_C_DC_128] = intra_pred_dc_128;

766 h->mv[ 7] = un_mv;

767 h->mv[19] = un_mv;

768 return 0;

769 }

770

771 av_cold int ff_cavs_end(AVCodecContext *avctx) {

772 AVSContext *h = avctx->priv_data;

773

774 av_frame_free(&h->cur.f);

775 av_frame_free(&h->DPB[0].f);

776 av_frame_free(&h->DPB[1].f);

777

778 av_free(h->top_qp);

779 av_free(h->top_mv[0]);

780 av_free(h->top_mv[1]);

781 av_free(h->top_pred_Y);

782 av_free(h->top_border_y);

783 av_free(h->top_border_u);

784 av_free(h->top_border_v);

785 av_free(h->col_mv);

786 av_free(h->col_type_base);

787 av_free(h->block);

788 av_freep(&h->edge_emu_buffer);

789 return 0;

790 }

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