yading@10: /* yading@10: * Copyright (C) 2006 Aurelien Jacobs yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * VP5 compatible video decoder yading@10: */ yading@10: yading@10: #include yading@10: #include yading@10: yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: yading@10: #include "vp56.h" yading@10: #include "vp56data.h" yading@10: #include "vp5data.h" yading@10: yading@10: yading@10: static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size) yading@10: { yading@10: VP56RangeCoder *c = &s->c; yading@10: int rows, cols; yading@10: yading@10: ff_vp56_init_range_decoder(&s->c, buf, buf_size); yading@10: s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c); yading@10: vp56_rac_get(c); yading@10: ff_vp56_init_dequant(s, vp56_rac_gets(c, 6)); yading@10: if (s->frames[VP56_FRAME_CURRENT]->key_frame) yading@10: { yading@10: vp56_rac_gets(c, 8); yading@10: if(vp56_rac_gets(c, 5) > 5) yading@10: return AVERROR_INVALIDDATA; yading@10: vp56_rac_gets(c, 2); yading@10: if (vp56_rac_get(c)) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */ yading@10: cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */ yading@10: if (!rows || !cols) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", yading@10: cols << 4, rows << 4); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ yading@10: vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ yading@10: vp56_rac_gets(c, 2); yading@10: if (!s->macroblocks || /* first frame */ yading@10: 16*cols != s->avctx->coded_width || yading@10: 16*rows != s->avctx->coded_height) { yading@10: avcodec_set_dimensions(s->avctx, 16*cols, 16*rows); yading@10: return VP56_SIZE_CHANGE; yading@10: } yading@10: } else if (!s->macroblocks) yading@10: return AVERROR_INVALIDDATA; yading@10: return 0; yading@10: } yading@10: yading@10: static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect) yading@10: { yading@10: VP56RangeCoder *c = &s->c; yading@10: VP56Model *model = s->modelp; yading@10: int comp, di; yading@10: yading@10: for (comp=0; comp<2; comp++) { yading@10: int delta = 0; yading@10: if (vp56_rac_get_prob(c, model->vector_dct[comp])) { yading@10: int sign = vp56_rac_get_prob(c, model->vector_sig[comp]); yading@10: di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]); yading@10: di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1; yading@10: delta = vp56_rac_get_tree(c, ff_vp56_pva_tree, yading@10: model->vector_pdv[comp]); yading@10: delta = di | (delta << 2); yading@10: delta = (delta ^ -sign) + sign; yading@10: } yading@10: if (!comp) yading@10: vect->x = delta; yading@10: else yading@10: vect->y = delta; yading@10: } yading@10: } yading@10: yading@10: static void vp5_parse_vector_models(VP56Context *s) yading@10: { yading@10: VP56RangeCoder *c = &s->c; yading@10: VP56Model *model = s->modelp; yading@10: int comp, node; yading@10: yading@10: for (comp=0; comp<2; comp++) { yading@10: if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0])) yading@10: model->vector_dct[comp] = vp56_rac_gets_nn(c, 7); yading@10: if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1])) yading@10: model->vector_sig[comp] = vp56_rac_gets_nn(c, 7); yading@10: if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2])) yading@10: model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7); yading@10: if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3])) yading@10: model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7); yading@10: } yading@10: yading@10: for (comp=0; comp<2; comp++) yading@10: for (node=0; node<7; node++) yading@10: if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node])) yading@10: model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7); yading@10: } yading@10: yading@10: static int vp5_parse_coeff_models(VP56Context *s) yading@10: { yading@10: VP56RangeCoder *c = &s->c; yading@10: VP56Model *model = s->modelp; yading@10: uint8_t def_prob[11]; yading@10: int node, cg, ctx; yading@10: int ct; /* code type */ yading@10: int pt; /* plane type (0 for Y, 1 for U or V) */ yading@10: yading@10: memset(def_prob, 0x80, sizeof(def_prob)); yading@10: yading@10: for (pt=0; pt<2; pt++) yading@10: for (node=0; node<11; node++) yading@10: if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) { yading@10: def_prob[node] = vp56_rac_gets_nn(c, 7); yading@10: model->coeff_dccv[pt][node] = def_prob[node]; yading@10: } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { yading@10: model->coeff_dccv[pt][node] = def_prob[node]; yading@10: } yading@10: yading@10: for (ct=0; ct<3; ct++) yading@10: for (pt=0; pt<2; pt++) yading@10: for (cg=0; cg<6; cg++) yading@10: for (node=0; node<11; node++) yading@10: if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) { yading@10: def_prob[node] = vp56_rac_gets_nn(c, 7); yading@10: model->coeff_ract[pt][ct][cg][node] = def_prob[node]; yading@10: } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) { yading@10: model->coeff_ract[pt][ct][cg][node] = def_prob[node]; yading@10: } yading@10: yading@10: /* coeff_dcct is a linear combination of coeff_dccv */ yading@10: for (pt=0; pt<2; pt++) yading@10: for (ctx=0; ctx<36; ctx++) yading@10: for (node=0; node<5; node++) yading@10: model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254); yading@10: yading@10: /* coeff_acct is a linear combination of coeff_ract */ yading@10: for (ct=0; ct<3; ct++) yading@10: for (pt=0; pt<2; pt++) yading@10: for (cg=0; cg<3; cg++) yading@10: for (ctx=0; ctx<6; ctx++) yading@10: for (node=0; node<5; node++) yading@10: model->coeff_acct[pt][ct][cg][ctx][node] = av_clip(((model->coeff_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254); yading@10: return 0; yading@10: } yading@10: yading@10: static void vp5_parse_coeff(VP56Context *s) yading@10: { yading@10: VP56RangeCoder *c = &s->c; yading@10: VP56Model *model = s->modelp; yading@10: uint8_t *permute = s->idct_scantable; yading@10: uint8_t *model1, *model2; yading@10: int coeff, sign, coeff_idx; yading@10: int b, i, cg, idx, ctx, ctx_last; yading@10: int pt = 0; /* plane type (0 for Y, 1 for U or V) */ yading@10: yading@10: for (b=0; b<6; b++) { yading@10: int ct = 1; /* code type */ yading@10: yading@10: if (b > 3) pt = 1; yading@10: yading@10: ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0] yading@10: + s->above_blocks[s->above_block_idx[b]].not_null_dc; yading@10: model1 = model->coeff_dccv[pt]; yading@10: model2 = model->coeff_dcct[pt][ctx]; yading@10: yading@10: coeff_idx = 0; yading@10: for (;;) { yading@10: if (vp56_rac_get_prob(c, model2[0])) { yading@10: if (vp56_rac_get_prob(c, model2[2])) { yading@10: if (vp56_rac_get_prob(c, model2[3])) { yading@10: s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4; yading@10: idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1); yading@10: sign = vp56_rac_get(c); yading@10: coeff = ff_vp56_coeff_bias[idx+5]; yading@10: for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--) yading@10: coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i; yading@10: } else { yading@10: if (vp56_rac_get_prob(c, model2[4])) { yading@10: coeff = 3 + vp56_rac_get_prob(c, model1[5]); yading@10: s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3; yading@10: } else { yading@10: coeff = 2; yading@10: s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2; yading@10: } yading@10: sign = vp56_rac_get(c); yading@10: } yading@10: ct = 2; yading@10: } else { yading@10: ct = 1; yading@10: s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1; yading@10: sign = vp56_rac_get(c); yading@10: coeff = 1; yading@10: } yading@10: coeff = (coeff ^ -sign) + sign; yading@10: if (coeff_idx) yading@10: coeff *= s->dequant_ac; yading@10: s->block_coeff[b][permute[coeff_idx]] = coeff; yading@10: } else { yading@10: if (ct && !vp56_rac_get_prob(c, model2[1])) yading@10: break; yading@10: ct = 0; yading@10: s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0; yading@10: } yading@10: coeff_idx++; yading@10: if (coeff_idx >= 64) yading@10: break; yading@10: yading@10: cg = vp5_coeff_groups[coeff_idx]; yading@10: ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx]; yading@10: model1 = model->coeff_ract[pt][ct][cg]; yading@10: model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx]; yading@10: } yading@10: yading@10: ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24); yading@10: s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx; yading@10: if (coeff_idx < ctx_last) yading@10: for (i=coeff_idx; i<=ctx_last; i++) yading@10: s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5; yading@10: s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0]; yading@10: } yading@10: } yading@10: yading@10: static void vp5_default_models_init(VP56Context *s) yading@10: { yading@10: VP56Model *model = s->modelp; yading@10: int i; yading@10: yading@10: for (i=0; i<2; i++) { yading@10: model->vector_sig[i] = 0x80; yading@10: model->vector_dct[i] = 0x80; yading@10: model->vector_pdi[i][0] = 0x55; yading@10: model->vector_pdi[i][1] = 0x80; yading@10: } yading@10: memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats)); yading@10: memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv)); yading@10: } yading@10: yading@10: static av_cold int vp5_decode_init(AVCodecContext *avctx) yading@10: { yading@10: VP56Context *s = avctx->priv_data; yading@10: int ret; yading@10: yading@10: if ((ret = ff_vp56_init(avctx, 1, 0)) < 0) yading@10: return ret; yading@10: s->vp56_coord_div = vp5_coord_div; yading@10: s->parse_vector_adjustment = vp5_parse_vector_adjustment; yading@10: s->parse_coeff = vp5_parse_coeff; yading@10: s->default_models_init = vp5_default_models_init; yading@10: s->parse_vector_models = vp5_parse_vector_models; yading@10: s->parse_coeff_models = vp5_parse_coeff_models; yading@10: s->parse_header = vp5_parse_header; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_vp5_decoder = { yading@10: .name = "vp5", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_VP5, yading@10: .priv_data_size = sizeof(VP56Context), yading@10: .init = vp5_decode_init, yading@10: .close = ff_vp56_free, yading@10: .decode = ff_vp56_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"), yading@10: };