649 lines
21 KiB
C
649 lines
21 KiB
C
/**
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* @file
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* VP6 compatible video decoder
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*
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* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
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*
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* The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
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* - upper 4bits: difference between encoded width and visible width
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* - lower 4bits: difference between encoded height and visible height
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "get_bits.h"
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#include "huffman.h"
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#include "vp56.h"
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#include "vp56data.h"
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#include "vp6data.h"
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#define VP6_MAX_HUFF_SIZE 12
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static void vp6_parse_coeff(VP56Context *s);
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static void vp6_parse_coeff_huffman(VP56Context *s);
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static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
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int *golden_frame)
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{
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VP56RangeCoder *c = &s->c;
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int parse_filter_info = 0;
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int coeff_offset = 0;
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int vrt_shift = 0;
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int sub_version;
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int rows, cols;
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int res = 1;
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int separated_coeff = buf[0] & 1;
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s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
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ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
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if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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sub_version = buf[1] >> 3;
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if (sub_version > 8)
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return 0;
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s->filter_header = buf[1] & 0x06;
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if (buf[1] & 1) {
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av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
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return 0;
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}
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if (separated_coeff || !s->filter_header) {
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coeff_offset = AV_RB16(buf+2) - 2;
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buf += 2;
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buf_size -= 2;
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}
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rows = buf[2]; /* number of stored macroblock rows */
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cols = buf[3]; /* number of stored macroblock cols */
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/* buf[4] is number of displayed macroblock rows */
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/* buf[5] is number of displayed macroblock cols */
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if (!s->macroblocks || /* first frame */
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16*cols != s->avctx->coded_width ||
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16*rows != s->avctx->coded_height) {
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avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
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if (s->avctx->extradata_size == 1) {
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s->avctx->width -= s->avctx->extradata[0] >> 4;
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s->avctx->height -= s->avctx->extradata[0] & 0x0F;
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}
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res = 2;
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}
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ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
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vp56_rac_gets(c, 2);
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parse_filter_info = s->filter_header;
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if (sub_version < 8)
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vrt_shift = 5;
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s->sub_version = sub_version;
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} else {
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if (!s->sub_version)
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return 0;
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if (separated_coeff || !s->filter_header) {
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coeff_offset = AV_RB16(buf+1) - 2;
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buf += 2;
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buf_size -= 2;
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}
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ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
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*golden_frame = vp56_rac_get(c);
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if (s->filter_header) {
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s->deblock_filtering = vp56_rac_get(c);
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if (s->deblock_filtering)
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vp56_rac_get(c);
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if (s->sub_version > 7)
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parse_filter_info = vp56_rac_get(c);
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}
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}
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if (parse_filter_info) {
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if (vp56_rac_get(c)) {
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s->filter_mode = 2;
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s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
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s->max_vector_length = 2 << vp56_rac_gets(c, 3);
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} else if (vp56_rac_get(c)) {
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s->filter_mode = 1;
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} else {
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s->filter_mode = 0;
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}
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if (s->sub_version > 7)
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s->filter_selection = vp56_rac_gets(c, 4);
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else
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s->filter_selection = 16;
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}
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s->use_huffman = vp56_rac_get(c);
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s->parse_coeff = vp6_parse_coeff;
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if (coeff_offset) {
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buf += coeff_offset;
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buf_size -= coeff_offset;
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if (buf_size < 0)
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return 0;
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if (s->use_huffman) {
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s->parse_coeff = vp6_parse_coeff_huffman;
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init_get_bits(&s->gb, buf, buf_size<<3);
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} else {
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ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
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s->ccp = &s->cc;
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}
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} else {
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s->ccp = &s->c;
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}
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return res;
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}
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static void vp6_coeff_order_table_init(VP56Context *s)
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{
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int i, pos, idx = 1;
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s->modelp->coeff_index_to_pos[0] = 0;
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for (i=0; i<16; i++)
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for (pos=1; pos<64; pos++)
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if (s->modelp->coeff_reorder[pos] == i)
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s->modelp->coeff_index_to_pos[idx++] = pos;
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}
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static void vp6_default_models_init(VP56Context *s)
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{
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VP56Model *model = s->modelp;
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model->vector_dct[0] = 0xA2;
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model->vector_dct[1] = 0xA4;
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model->vector_sig[0] = 0x80;
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model->vector_sig[1] = 0x80;
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memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
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memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
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memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
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memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
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memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
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vp6_coeff_order_table_init(s);
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}
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static void vp6_parse_vector_models(VP56Context *s)
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{
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VP56RangeCoder *c = &s->c;
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VP56Model *model = s->modelp;
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int comp, node;
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for (comp=0; comp<2; comp++) {
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if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
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model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
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if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
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model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
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}
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for (comp=0; comp<2; comp++)
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for (node=0; node<7; node++)
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if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
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model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
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for (comp=0; comp<2; comp++)
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for (node=0; node<8; node++)
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if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
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model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
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}
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/* nodes must ascend by count, but with descending symbol order */
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static int vp6_huff_cmp(const void *va, const void *vb)
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{
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const Node *a = va, *b = vb;
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return (a->count - b->count)*16 + (b->sym - a->sym);
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}
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static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
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const uint8_t *map, unsigned size, VLC *vlc)
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{
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Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
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int a, b, i;
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/* first compute probabilities from model */
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tmp[0].count = 256;
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for (i=0; i<size-1; i++) {
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a = tmp[i].count * coeff_model[i] >> 8;
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b = tmp[i].count * (255 - coeff_model[i]) >> 8;
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nodes[map[2*i ]].count = a + !a;
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nodes[map[2*i+1]].count = b + !b;
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}
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free_vlc(vlc);
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/* then build the huffman tree accodring to probabilities */
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ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
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FF_HUFFMAN_FLAG_HNODE_FIRST);
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}
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static void vp6_parse_coeff_models(VP56Context *s)
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{
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VP56RangeCoder *c = &s->c;
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VP56Model *model = s->modelp;
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int def_prob[11];
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int node, cg, ctx, pos;
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int ct; /* code type */
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int pt; /* plane type (0 for Y, 1 for U or V) */
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memset(def_prob, 0x80, sizeof(def_prob));
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for (pt=0; pt<2; pt++)
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for (node=0; node<11; node++)
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if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
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def_prob[node] = vp56_rac_gets_nn(c, 7);
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model->coeff_dccv[pt][node] = def_prob[node];
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} else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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model->coeff_dccv[pt][node] = def_prob[node];
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}
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if (vp56_rac_get(c)) {
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for (pos=1; pos<64; pos++)
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if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
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model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
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vp6_coeff_order_table_init(s);
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}
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for (cg=0; cg<2; cg++)
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for (node=0; node<14; node++)
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if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
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model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
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for (ct=0; ct<3; ct++)
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for (pt=0; pt<2; pt++)
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for (cg=0; cg<6; cg++)
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for (node=0; node<11; node++)
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if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
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def_prob[node] = vp56_rac_gets_nn(c, 7);
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model->coeff_ract[pt][ct][cg][node] = def_prob[node];
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} else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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model->coeff_ract[pt][ct][cg][node] = def_prob[node];
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}
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if (s->use_huffman) {
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for (pt=0; pt<2; pt++) {
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vp6_build_huff_tree(s, model->coeff_dccv[pt],
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vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
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vp6_build_huff_tree(s, model->coeff_runv[pt],
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vp6_huff_run_map, 9, &s->runv_vlc[pt]);
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for (ct=0; ct<3; ct++)
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for (cg = 0; cg < 6; cg++)
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vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
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vp6_huff_coeff_map, 12,
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&s->ract_vlc[pt][ct][cg]);
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}
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memset(s->nb_null, 0, sizeof(s->nb_null));
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} else {
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/* coeff_dcct is a linear combination of coeff_dccv */
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for (pt=0; pt<2; pt++)
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for (ctx=0; ctx<3; ctx++)
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for (node=0; node<5; node++)
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model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
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}
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}
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static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
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{
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VP56RangeCoder *c = &s->c;
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VP56Model *model = s->modelp;
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int comp;
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*vect = (VP56mv) {0,0};
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if (s->vector_candidate_pos < 2)
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*vect = s->vector_candidate[0];
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for (comp=0; comp<2; comp++) {
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int i, delta = 0;
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if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
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static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
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for (i=0; i<sizeof(prob_order); i++) {
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int j = prob_order[i];
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delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
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}
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if (delta & 0xF0)
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delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
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else
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delta |= 8;
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} else {
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delta = vp56_rac_get_tree(c, vp56_pva_tree,
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model->vector_pdv[comp]);
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}
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if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
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delta = -delta;
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if (!comp)
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vect->x += delta;
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else
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vect->y += delta;
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}
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}
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/**
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* Read number of consecutive blocks with null DC or AC.
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* This value is < 74.
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*/
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static unsigned vp6_get_nb_null(VP56Context *s)
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{
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unsigned val = get_bits(&s->gb, 2);
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if (val == 2)
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val += get_bits(&s->gb, 2);
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else if (val == 3) {
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val = get_bits1(&s->gb) << 2;
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val = 6+val + get_bits(&s->gb, 2+val);
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}
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return val;
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}
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static void vp6_parse_coeff_huffman(VP56Context *s)
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{
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VP56Model *model = s->modelp;
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uint8_t *permute = s->scantable.permutated;
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VLC *vlc_coeff;
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int coeff, sign, coeff_idx;
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int b, cg, idx;
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int pt = 0; /* plane type (0 for Y, 1 for U or V) */
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for (b=0; b<6; b++) {
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int ct = 0; /* code type */
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if (b > 3) pt = 1;
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vlc_coeff = &s->dccv_vlc[pt];
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for (coeff_idx=0; coeff_idx<64; ) {
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int run = 1;
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if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
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s->nb_null[coeff_idx][pt]--;
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if (coeff_idx)
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break;
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} else {
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if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
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return;
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coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
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if (coeff == 0) {
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if (coeff_idx) {
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int pt = (coeff_idx >= 6);
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run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
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if (run >= 9)
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run += get_bits(&s->gb, 6);
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} else
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s->nb_null[0][pt] = vp6_get_nb_null(s);
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ct = 0;
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} else if (coeff == 11) { /* end of block */
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if (coeff_idx == 1) /* first AC coeff ? */
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s->nb_null[1][pt] = vp6_get_nb_null(s);
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break;
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} else {
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int coeff2 = vp56_coeff_bias[coeff];
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if (coeff > 4)
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coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
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ct = 1 + (coeff2 > 1);
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sign = get_bits1(&s->gb);
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coeff2 = (coeff2 ^ -sign) + sign;
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if (coeff_idx)
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coeff2 *= s->dequant_ac;
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idx = model->coeff_index_to_pos[coeff_idx];
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s->block_coeff[b][permute[idx]] = coeff2;
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}
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}
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coeff_idx+=run;
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cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
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vlc_coeff = &s->ract_vlc[pt][ct][cg];
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}
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}
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}
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static void vp6_parse_coeff(VP56Context *s)
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{
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VP56RangeCoder *c = s->ccp;
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VP56Model *model = s->modelp;
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uint8_t *permute = s->scantable.permutated;
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uint8_t *model1, *model2, *model3;
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int coeff, sign, coeff_idx;
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int b, i, cg, idx, ctx;
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int pt = 0; /* plane type (0 for Y, 1 for U or V) */
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for (b=0; b<6; b++) {
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int ct = 1; /* code type */
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int run = 1;
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if (b > 3) pt = 1;
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ctx = s->left_block[vp56_b6to4[b]].not_null_dc
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+ s->above_blocks[s->above_block_idx[b]].not_null_dc;
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model1 = model->coeff_dccv[pt];
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model2 = model->coeff_dcct[pt][ctx];
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for (coeff_idx=0; coeff_idx<64; ) {
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if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
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/* parse a coeff */
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if (vp56_rac_get_prob(c, model2[2])) {
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if (vp56_rac_get_prob(c, model2[3])) {
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idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
|
|
coeff = vp56_coeff_bias[idx+5];
|
|
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, model1[5]);
|
|
else
|
|
coeff = 2;
|
|
}
|
|
ct = 2;
|
|
} else {
|
|
ct = 1;
|
|
coeff = 1;
|
|
}
|
|
sign = vp56_rac_get(c);
|
|
coeff = (coeff ^ -sign) + sign;
|
|
if (coeff_idx)
|
|
coeff *= s->dequant_ac;
|
|
idx = model->coeff_index_to_pos[coeff_idx];
|
|
s->block_coeff[b][permute[idx]] = coeff;
|
|
run = 1;
|
|
} else {
|
|
/* parse a run */
|
|
ct = 0;
|
|
if (coeff_idx > 0) {
|
|
if (!vp56_rac_get_prob(c, model2[1]))
|
|
break;
|
|
|
|
model3 = model->coeff_runv[coeff_idx >= 6];
|
|
run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
|
|
if (!run)
|
|
for (run=9, i=0; i<6; i++)
|
|
run += vp56_rac_get_prob(c, model3[i+8]) << i;
|
|
}
|
|
}
|
|
|
|
cg = vp6_coeff_groups[coeff_idx+=run];
|
|
model1 = model2 = model->coeff_ract[pt][ct][cg];
|
|
}
|
|
|
|
s->left_block[vp56_b6to4[b]].not_null_dc =
|
|
s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
|
|
}
|
|
}
|
|
|
|
static int vp6_block_variance(uint8_t *src, int stride)
|
|
{
|
|
int sum = 0, square_sum = 0;
|
|
int y, x;
|
|
|
|
for (y=0; y<8; y+=2) {
|
|
for (x=0; x<8; x+=2) {
|
|
sum += src[x];
|
|
square_sum += src[x]*src[x];
|
|
}
|
|
src += 2*stride;
|
|
}
|
|
return (16*square_sum - sum*sum) >> 8;
|
|
}
|
|
|
|
static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
|
|
int delta, const int16_t *weights)
|
|
{
|
|
int x, y;
|
|
|
|
for (y=0; y<8; y++) {
|
|
for (x=0; x<8; x++) {
|
|
dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
|
|
+ src[x ] * weights[1]
|
|
+ src[x+delta ] * weights[2]
|
|
+ src[x+2*delta] * weights[3] + 64) >> 7);
|
|
}
|
|
src += stride;
|
|
dst += stride;
|
|
}
|
|
}
|
|
|
|
static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
|
|
int stride, int h_weight, int v_weight)
|
|
{
|
|
uint8_t *tmp = s->edge_emu_buffer+16;
|
|
s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
|
|
s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
|
|
}
|
|
|
|
static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
|
|
int offset1, int offset2, int stride,
|
|
VP56mv mv, int mask, int select, int luma)
|
|
{
|
|
int filter4 = 0;
|
|
int x8 = mv.x & mask;
|
|
int y8 = mv.y & mask;
|
|
|
|
if (luma) {
|
|
x8 *= 2;
|
|
y8 *= 2;
|
|
filter4 = s->filter_mode;
|
|
if (filter4 == 2) {
|
|
if (s->max_vector_length &&
|
|
(FFABS(mv.x) > s->max_vector_length ||
|
|
FFABS(mv.y) > s->max_vector_length)) {
|
|
filter4 = 0;
|
|
} else if (s->sample_variance_threshold
|
|
&& (vp6_block_variance(src+offset1, stride)
|
|
< s->sample_variance_threshold)) {
|
|
filter4 = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
|
|
offset1 = offset2;
|
|
}
|
|
|
|
if (filter4) {
|
|
if (!y8) { /* left or right combine */
|
|
vp6_filter_hv4(dst, src+offset1, stride, 1,
|
|
vp6_block_copy_filter[select][x8]);
|
|
} else if (!x8) { /* above or below combine */
|
|
vp6_filter_hv4(dst, src+offset1, stride, stride,
|
|
vp6_block_copy_filter[select][y8]);
|
|
} else {
|
|
s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
|
|
vp6_block_copy_filter[select][x8],
|
|
vp6_block_copy_filter[select][y8]);
|
|
}
|
|
} else {
|
|
if (!x8 || !y8) {
|
|
s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
|
|
} else {
|
|
vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
|
|
}
|
|
}
|
|
}
|
|
|
|
static av_cold int vp6_decode_init(AVCodecContext *avctx)
|
|
{
|
|
VP56Context *s = avctx->priv_data;
|
|
|
|
ff_vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
|
|
avctx->codec->id == CODEC_ID_VP6A);
|
|
s->vp56_coord_div = vp6_coord_div;
|
|
s->parse_vector_adjustment = vp6_parse_vector_adjustment;
|
|
s->filter = vp6_filter;
|
|
s->default_models_init = vp6_default_models_init;
|
|
s->parse_vector_models = vp6_parse_vector_models;
|
|
s->parse_coeff_models = vp6_parse_coeff_models;
|
|
s->parse_header = vp6_parse_header;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int vp6_decode_free(AVCodecContext *avctx)
|
|
{
|
|
VP56Context *s = avctx->priv_data;
|
|
int pt, ct, cg;
|
|
|
|
ff_vp56_free(avctx);
|
|
|
|
for (pt=0; pt<2; pt++) {
|
|
free_vlc(&s->dccv_vlc[pt]);
|
|
free_vlc(&s->runv_vlc[pt]);
|
|
for (ct=0; ct<3; ct++)
|
|
for (cg=0; cg<6; cg++)
|
|
free_vlc(&s->ract_vlc[pt][ct][cg]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_vp6_decoder = {
|
|
"vp6",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_VP6,
|
|
sizeof(VP56Context),
|
|
vp6_decode_init,
|
|
NULL,
|
|
vp6_decode_free,
|
|
ff_vp56_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
|
|
};
|
|
|
|
/* flash version, not flipped upside-down */
|
|
AVCodec ff_vp6f_decoder = {
|
|
"vp6f",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_VP6F,
|
|
sizeof(VP56Context),
|
|
vp6_decode_init,
|
|
NULL,
|
|
vp6_decode_free,
|
|
ff_vp56_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
|
|
};
|
|
|
|
/* flash version, not flipped upside-down, with alpha channel */
|
|
AVCodec ff_vp6a_decoder = {
|
|
"vp6a",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_VP6A,
|
|
sizeof(VP56Context),
|
|
vp6_decode_init,
|
|
NULL,
|
|
vp6_decode_free,
|
|
ff_vp56_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
|
|
};
|