From 5ce117c37c9b1ff5ed121f372e972e9eb3d83d23 Mon Sep 17 00:00:00 2001 From: Aurelien Jacobs Date: Sat, 9 Sep 2006 17:19:37 +0000 Subject: VP5 and VP6 video decoder Originally committed as revision 6213 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/vp5.c | 289 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 289 insertions(+) create mode 100644 libavcodec/vp5.c (limited to 'libavcodec/vp5.c') diff --git a/libavcodec/vp5.c b/libavcodec/vp5.c new file mode 100644 index 0000000000..f87e91d2a2 --- /dev/null +++ b/libavcodec/vp5.c @@ -0,0 +1,289 @@ +/** + * @file vp5.c + * VP5 compatible video decoder + * + * Copyright (C) 2006 Aurelien Jacobs + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include + +#include "avcodec.h" +#include "dsputil.h" +#include "bitstream.h" +#include "mpegvideo.h" + +#include "vp56.h" +#include "vp56data.h" +#include "vp5data.h" + + +static int vp5_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size, + int *golden_frame) +{ + vp56_range_coder_t *c = &s->c; + int rows, cols; + + vp56_init_range_decoder(&s->c, buf, buf_size); + s->frames[VP56_FRAME_CURRENT].key_frame = !vp56_rac_get(c); + vp56_rac_get(c); + vp56_init_dequant(s, vp56_rac_gets(c, 6)); + if (s->frames[VP56_FRAME_CURRENT].key_frame) + { + vp56_rac_gets(c, 8); + if(vp56_rac_gets(c, 5) > 5) + return 0; + vp56_rac_gets(c, 2); + if (vp56_rac_get(c)) { + av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n"); + return 0; + } + rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */ + cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */ + vp56_rac_gets(c, 8); /* number of displayed macroblock rows */ + vp56_rac_gets(c, 8); /* number of displayed macroblock cols */ + vp56_rac_gets(c, 2); + if (16*cols != s->avctx->coded_width || + 16*rows != s->avctx->coded_height) { + avcodec_set_dimensions(s->avctx, 16*cols, 16*rows); + return 2; + } + } + return 1; +} + +/* Gives very similar result than the vp6 version except in a few cases */ +static int vp5_adjust(int v, int t) +{ + int s2, s1 = v >> 31; + v ^= s1; + v -= s1; + v *= v < 2*t; + v -= t; + s2 = v >> 31; + v ^= s2; + v -= s2; + v = t - v; + v += s1; + v ^= s1; + return v; +} + +static void vp5_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vector) +{ + vp56_range_coder_t *c = &s->c; + int comp, di; + + for (comp=0; comp<2; comp++) { + int delta = 0; + if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) { + int sign = vp56_rac_get_prob(c, s->vector_model_sig[comp]); + di = vp56_rac_get_prob(c, s->vector_model_pdi[comp][0]); + di |= vp56_rac_get_prob(c, s->vector_model_pdi[comp][1]) << 1; + delta = vp56_rac_get_tree(c, vp56_pva_tree, + s->vector_model_pdv[comp]); + delta = di | (delta << 2); + delta = (delta ^ -sign) + sign; + } + if (!comp) + vector->x = delta; + else + vector->y = delta; + } +} + +static void vp5_parse_vector_models(vp56_context_t *s) +{ + vp56_range_coder_t *c = &s->c; + int comp, node; + + for (comp=0; comp<2; comp++) { + if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0])) + s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7); + if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1])) + s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7); + if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2])) + s->vector_model_pdi[comp][0] = vp56_rac_gets_nn(c, 7); + if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3])) + s->vector_model_pdi[comp][1] = vp56_rac_gets_nn(c, 7); + } + + for (comp=0; comp<2; comp++) + for (node=0; node<7; node++) + if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node])) + s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7); +} + +static void vp5_parse_coeff_models(vp56_context_t *s) +{ + vp56_range_coder_t *c = &s->c; + uint8_t def_prob[11]; + int node, cg, ctx; + int ct; /* code type */ + int pt; /* plane type (0 for Y, 1 for U or V) */ + + memset(def_prob, 0x80, sizeof(def_prob)); + + for (pt=0; pt<2; pt++) + for (node=0; node<11; node++) + if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) { + def_prob[node] = vp56_rac_gets_nn(c, 7); + s->coeff_model_dccv[pt][node] = def_prob[node]; + } else if (s->frames[VP56_FRAME_CURRENT].key_frame) { + s->coeff_model_dccv[pt][node] = def_prob[node]; + } + + for (ct=0; ct<3; ct++) + for (pt=0; pt<2; pt++) + for (cg=0; cg<6; cg++) + for (node=0; node<11; node++) + if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) { + def_prob[node] = vp56_rac_gets_nn(c, 7); + s->coeff_model_ract[pt][ct][cg][node] = def_prob[node]; + } else if (s->frames[VP56_FRAME_CURRENT].key_frame) { + s->coeff_model_ract[pt][ct][cg][node] = def_prob[node]; + } + + /* coeff_model_dcct is a linear combination of coeff_model_dccv */ + for (pt=0; pt<2; pt++) + for (ctx=0; ctx<36; ctx++) + for (node=0; node<5; node++) + s->coeff_model_dcct[pt][ctx][node] = clip(((s->coeff_model_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254); + + /* coeff_model_acct is a linear combination of coeff_model_ract */ + for (ct=0; ct<3; ct++) + for (pt=0; pt<2; pt++) + for (cg=0; cg<3; cg++) + for (ctx=0; ctx<6; ctx++) + for (node=0; node<5; node++) + s->coeff_model_acct[pt][ct][cg][ctx][node] = clip(((s->coeff_model_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); +} + +static void vp5_parse_coeff(vp56_context_t *s) +{ + vp56_range_coder_t *c = &s->c; + uint8_t *permute = s->scantable.permutated; + uint8_t *model, *model2; + int coeff, sign, coeff_idx; + int b, i, cg, idx, ctx, ctx_last; + int pt = 0; /* plane type (0 for Y, 1 for U or V) */ + + for (b=0; b<6; b++) { + int ct = 1; /* code type */ + + if (b > 3) pt = 1; + + ctx = 6*s->coeff_ctx[vp56_b6to4[b]][0] + + s->above_blocks[s->above_block_idx[b]].not_null_dc; + model = s->coeff_model_dccv[pt]; + model2 = s->coeff_model_dcct[pt][ctx]; + + for (coeff_idx=0; coeff_idx<64; ) { + if (vp56_rac_get_prob(c, model2[0])) { + if (vp56_rac_get_prob(c, model2[2])) { + if (vp56_rac_get_prob(c, model2[3])) { + s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4; + idx = vp56_rac_get_tree(c, vp56_pc_tree, model); + sign = vp56_rac_get(c); + coeff = vp56_coeff_bias[idx]; + for (i=vp56_coeff_bit_length[idx]; i>=0; i--) + coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i; + } else { + if (vp56_rac_get_prob(c, model2[4])) { + coeff = 3 + vp56_rac_get_prob(c, model[5]); + s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 3; + } else { + coeff = 2; + s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 2; + } + sign = vp56_rac_get(c); + } + ct = 2; + } else { + ct = 1; + s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 1; + sign = vp56_rac_get(c); + coeff = 1; + } + coeff = (coeff ^ -sign) + sign; + if (coeff_idx) + coeff *= s->dequant_ac; + s->block_coeff[b][permute[coeff_idx]] = coeff; + } else { + if (ct && !vp56_rac_get_prob(c, model2[1])) + break; + ct = 0; + s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 0; + } + + cg = vp5_coeff_groups[++coeff_idx]; + ctx = s->coeff_ctx[vp56_b6to4[b]][coeff_idx]; + model = s->coeff_model_ract[pt][ct][cg]; + model2 = cg > 2 ? model : s->coeff_model_acct[pt][ct][cg][ctx]; + } + + ctx_last = FFMIN(s->coeff_ctx_last[vp56_b6to4[b]], 24); + s->coeff_ctx_last[vp56_b6to4[b]] = coeff_idx; + if (coeff_idx < ctx_last) + for (i=coeff_idx; i<=ctx_last; i++) + s->coeff_ctx[vp56_b6to4[b]][i] = 5; + s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[vp56_b6to4[b]][0]; + } +} + +static void vp5_default_models_init(vp56_context_t *s) +{ + int i; + + for (i=0; i<2; i++) { + s->vector_model_sig[i] = 0x80; + s->vector_model_dct[i] = 0x80; + s->vector_model_pdi[i][0] = 0x55; + s->vector_model_pdi[i][1] = 0x80; + } + memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats)); + memset(s->vector_model_pdv, 0x80, sizeof(s->vector_model_pdv)); +} + +static int vp5_decode_init(AVCodecContext *avctx) +{ + vp56_context_t *s = avctx->priv_data; + + vp56_init(s, avctx, 1); + s->vp56_coord_div = vp5_coord_div; + s->parse_vector_adjustment = vp5_parse_vector_adjustment; + s->adjust = vp5_adjust; + s->parse_coeff = vp5_parse_coeff; + s->default_models_init = vp5_default_models_init; + s->parse_vector_models = vp5_parse_vector_models; + s->parse_coeff_models = vp5_parse_coeff_models; + s->parse_header = vp5_parse_header; + + return 0; +} + +AVCodec vp5_decoder = { + "vp5", + CODEC_TYPE_VIDEO, + CODEC_ID_VP5, + sizeof(vp56_context_t), + vp5_decode_init, + NULL, + vp56_free, + vp56_decode_frame, +}; -- cgit v1.2.3