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FFmpeg/libavcodec/vp5.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

310 lines
11 KiB
C

/*
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* VP5 compatible video decoder
*/
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "internal.h"
#include "vp56.h"
#include "vp56data.h"
#include "vp5data.h"
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
{
VP56RangeCoder *c = &s->c;
int rows, cols;
int ret;
ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size);
if (ret < 0)
return ret;
s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
vp56_rac_get(c);
ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
if (s->frames[VP56_FRAME_CURRENT]->key_frame)
{
int render_x, render_y;
vp56_rac_gets(c, 8);
if(vp56_rac_gets(c, 5) > 5)
return AVERROR_INVALIDDATA;
vp56_rac_gets(c, 2);
if (vp56_rac_get(c)) {
avpriv_report_missing_feature(s->avctx, "Interlacing");
return AVERROR_PATCHWELCOME;
}
rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
if (!rows || !cols) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
cols << 4, rows << 4);
return AVERROR_INVALIDDATA;
}
render_y = vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
render_x = vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
if (render_x == 0 || render_x > cols ||
render_y == 0 || render_y > rows)
return AVERROR_INVALIDDATA;
vp56_rac_gets(c, 2);
if (!s->macroblocks || /* first frame */
16*cols != s->avctx->coded_width ||
16*rows != s->avctx->coded_height) {
int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
if (ret < 0)
return ret;
return VP56_SIZE_CHANGE;
}
} else if (!s->macroblocks)
return AVERROR_INVALIDDATA;
return 0;
}
static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
int comp, di;
for (comp=0; comp<2; comp++) {
int delta = 0;
if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
model->vector_pdv[comp]);
delta = di | (delta << 2);
delta = (delta ^ -sign) + sign;
}
if (!comp)
vect->x = delta;
else
vect->y = delta;
}
}
static void vp5_parse_vector_models(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
int comp, node;
for (comp=0; comp<2; comp++) {
if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
model->vector_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_branchy(c, vp5_vmc_pct[comp][4 + node]))
model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
}
static int vp5_parse_coeff_models(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
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_branchy(c, vp5_dccv_pct[pt][node])) {
def_prob[node] = vp56_rac_gets_nn(c, 7);
model->coeff_dccv[pt][node] = def_prob[node];
} else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
model->coeff_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_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
def_prob[node] = vp56_rac_gets_nn(c, 7);
model->coeff_ract[pt][ct][cg][node] = def_prob[node];
} else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
model->coeff_ract[pt][ct][cg][node] = def_prob[node];
}
/* coeff_dcct is a linear combination of coeff_dccv */
for (pt=0; pt<2; pt++)
for (ctx=0; ctx<36; ctx++)
for (node=0; node<5; node++)
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);
/* coeff_acct is a linear combination of coeff_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++)
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);
return 0;
}
static int vp5_parse_coeff(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
uint8_t *permute = s->idct_scantable;
uint8_t *model1, *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) */
if (vpX_rac_is_end(c)) {
av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
return AVERROR_INVALIDDATA;
}
for (b=0; b<6; b++) {
int ct = 1; /* code type */
if (b > 3) pt = 1;
ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
+ s->above_blocks[s->above_block_idx[b]].not_null_dc;
model1 = model->coeff_dccv[pt];
model2 = model->coeff_dcct[pt][ctx];
coeff_idx = 0;
for (;;) {
if (vp56_rac_get_prob_branchy(c, model2[0])) {
if (vp56_rac_get_prob_branchy(c, model2[2])) {
if (vp56_rac_get_prob_branchy(c, model2[3])) {
s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
sign = vp56_rac_get(c);
coeff = ff_vp56_coeff_bias[idx+5];
for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
} else {
if (vp56_rac_get_prob_branchy(c, model2[4])) {
coeff = 3 + vp56_rac_get_prob(c, model1[5]);
s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
} else {
coeff = 2;
s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
}
sign = vp56_rac_get(c);
}
ct = 2;
} else {
ct = 1;
s->coeff_ctx[ff_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_branchy(c, model2[1]))
break;
ct = 0;
s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
}
coeff_idx++;
if (coeff_idx >= 64)
break;
cg = vp5_coeff_groups[coeff_idx];
ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
model1 = model->coeff_ract[pt][ct][cg];
model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
}
ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
if (coeff_idx < ctx_last)
for (i=coeff_idx; i<=ctx_last; i++)
s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
s->idct_selector[b] = 63;
}
return 0;
}
static void vp5_default_models_init(VP56Context *s)
{
VP56Model *model = s->modelp;
int i;
for (i=0; i<2; i++) {
model->vector_sig[i] = 0x80;
model->vector_dct[i] = 0x80;
model->vector_pdi[i][0] = 0x55;
model->vector_pdi[i][1] = 0x80;
}
memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
}
static av_cold int vp5_decode_init(AVCodecContext *avctx)
{
VP56Context *s = avctx->priv_data;
int ret;
if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
return ret;
ff_vp5dsp_init(&s->vp56dsp);
s->vp56_coord_div = vp5_coord_div;
s->parse_vector_adjustment = vp5_parse_vector_adjustment;
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;
}
const AVCodec ff_vp5_decoder = {
.name = "vp5",
.long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_VP5,
.priv_data_size = sizeof(VP56Context),
.init = vp5_decode_init,
.close = ff_vp56_free,
.decode = ff_vp56_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};