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ffmpeg/libavcodec/vp6.c

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/**
* @file vp6.c
* VP6 compatible video decoder
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
*
* The VP6F decoder accept an optional 1 byte extradata. It is composed of:
* - upper 4bits: difference between encoded width and visible width
* - lower 4bits: difference between encoded height and visible height
*/
#include <stdlib.h>
#include "avcodec.h"
#include "dsputil.h"
#include "bitstream.h"
#include "mpegvideo.h"
#include "vp56.h"
#include "vp56data.h"
#include "vp6data.h"
static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
int *golden_frame)
{
vp56_range_coder_t *c = &s->c;
int parse_filter_info = 0;
int coeff_offset = 0;
int vrt_shift = 0;
int sub_version;
int rows, cols;
int res = 1;
int separated_coeff = buf[0] & 1;
s->frames[VP56_FRAME_CURRENT].key_frame = !(buf[0] & 0x80);
vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
if (s->frames[VP56_FRAME_CURRENT].key_frame) {
sub_version = buf[1] >> 3;
if (sub_version > 8)
return 0;
s->filter_header = buf[1] & 0x06;
if (buf[1] & 1) {
av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
return 0;
}
if (separated_coeff || !s->filter_header) {
coeff_offset = AV_RB16(buf+2) - 2;
buf += 2;
buf_size -= 2;
}
rows = buf[2]; /* number of stored macroblock rows */
cols = buf[3]; /* number of stored macroblock cols */
/* buf[4] is number of displayed macroblock rows */
/* buf[5] is number of displayed macroblock cols */
if (16*cols != s->avctx->coded_width ||
16*rows != s->avctx->coded_height) {
avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
if (s->avctx->extradata_size == 1) {
s->avctx->width -= s->avctx->extradata[0] >> 4;
s->avctx->height -= s->avctx->extradata[0] & 0x0F;
}
res = 2;
}
vp56_init_range_decoder(c, buf+6, buf_size-6);
vp56_rac_gets(c, 2);
parse_filter_info = s->filter_header;
if (sub_version < 8)
vrt_shift = 5;
s->sub_version = sub_version;
} else {
if (!s->sub_version)
return 0;
if (separated_coeff || !s->filter_header) {
coeff_offset = AV_RB16(buf+1) - 2;
buf += 2;
buf_size -= 2;
}
vp56_init_range_decoder(c, buf+1, buf_size-1);
*golden_frame = vp56_rac_get(c);
if (s->filter_header) {
s->deblock_filtering = vp56_rac_get(c);
if (s->deblock_filtering)
vp56_rac_get(c);
if (s->sub_version > 7)
parse_filter_info = vp56_rac_get(c);
}
}
if (parse_filter_info) {
if (vp56_rac_get(c)) {
s->filter_mode = 2;
s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
s->max_vector_length = 2 << vp56_rac_gets(c, 3);
} else if (vp56_rac_get(c)) {
s->filter_mode = 1;
} else {
s->filter_mode = 0;
}
if (s->sub_version > 7)
s->filter_selection = vp56_rac_gets(c, 4);
else
s->filter_selection = 16;
}
vp56_rac_get(c);
if (coeff_offset) {
vp56_init_range_decoder(&s->cc, buf+coeff_offset,
buf_size-coeff_offset);
s->ccp = &s->cc;
} else {
s->ccp = &s->c;
}
return res;
}
static void vp6_coeff_order_table_init(vp56_context_t *s)
{
int i, pos, idx = 1;
s->coeff_index_to_pos[0] = 0;
for (i=0; i<16; i++)
for (pos=1; pos<64; pos++)
if (s->coeff_reorder[pos] == i)
s->coeff_index_to_pos[idx++] = pos;
}
static void vp6_default_models_init(vp56_context_t *s)
{
s->vector_model_dct[0] = 0xA2;
s->vector_model_dct[1] = 0xA4;
s->vector_model_sig[0] = 0x80;
s->vector_model_sig[1] = 0x80;
memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));
memcpy(s->vector_model_fdv, vp6_def_fdv_vector_model, sizeof(s->vector_model_fdv));
memcpy(s->vector_model_pdv, vp6_def_pdv_vector_model, sizeof(s->vector_model_pdv));
memcpy(s->coeff_model_runv, vp6_def_runv_coeff_model, sizeof(s->coeff_model_runv));
memcpy(s->coeff_reorder, vp6_def_coeff_reorder, sizeof(s->coeff_reorder));
vp6_coeff_order_table_init(s);
}
static void vp6_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, vp6_sig_dct_pct[comp][0]))
s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);
if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);
}
for (comp=0; comp<2; comp++)
for (node=0; node<7; node++)
if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
for (comp=0; comp<2; comp++)
for (node=0; node<8; node++)
if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
s->vector_model_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
}
static void vp6_parse_coeff_models(vp56_context_t *s)
{
vp56_range_coder_t *c = &s->c;
int def_prob[11];
int node, cg, ctx, pos;
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, vp6_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];
}
if (vp56_rac_get(c)) {
for (pos=1; pos<64; pos++)
if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
s->coeff_reorder[pos] = vp56_rac_gets(c, 4);
vp6_coeff_order_table_init(s);
}
for (cg=0; cg<2; cg++)
for (node=0; node<14; node++)
if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
s->coeff_model_runv[cg][node] = vp56_rac_gets_nn(c, 7);
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, vp6_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<3; ctx++)
for (node=0; node<5; node++)
s->coeff_model_dcct[pt][ctx][node] = clip(((s->coeff_model_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
}
static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
{
vp56_range_coder_t *c = &s->c;
int comp;
*vect = (vp56_mv_t) {0,0};
if (s->vector_candidate_pos < 2)
*vect = s->vector_candidate[0];
for (comp=0; comp<2; comp++) {
int i, delta = 0;
if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {
static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
for (i=0; i<sizeof(prob_order); i++) {
int j = prob_order[i];
delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][j])<<j;
}
if (delta & 0xF0)
delta |= vp56_rac_get_prob(c, s->vector_model_fdv[comp][3])<<3;
else
delta |= 8;
} else {
delta = vp56_rac_get_tree(c, vp56_pva_tree,
s->vector_model_pdv[comp]);
}
if (delta && vp56_rac_get_prob(c, s->vector_model_sig[comp]))
delta = -delta;
if (!comp)
vect->x += delta;
else
vect->y += delta;
}
}
static void vp6_parse_coeff(vp56_context_t *s)
{
vp56_range_coder_t *c = s->ccp;
uint8_t *permute = s->scantable.permutated;
uint8_t *model, *model2, *model3;
int coeff, sign, coeff_idx;
int b, i, cg, idx, ctx;
int pt = 0; /* plane type (0 for Y, 1 for U or V) */
for (b=0; b<6; b++) {
int ct = 1; /* code type */
int run = 1;
if (b > 3) pt = 1;
ctx = s->left_block[vp56_b6to4[b]].not_null_dc
+ 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 ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
/* parse a coeff */
if (coeff_idx == 0) {
s->left_block[vp56_b6to4[b]].not_null_dc = 1;
s->above_blocks[s->above_block_idx[b]].not_null_dc = 1;
}
if (vp56_rac_get_prob(c, model2[2])) {
if (vp56_rac_get_prob(c, model2[3])) {
idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
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]);
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 = s->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) {
s->left_block[vp56_b6to4[b]].not_null_dc = 0;
s->above_blocks[s->above_block_idx[b]].not_null_dc = 0;
} else {
if (!vp56_rac_get_prob(c, model2[1]))
break;
model3 = s->coeff_model_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];
model = model2 = s->coeff_model_ract[pt][ct][cg];
}
}
}
static int vp6_adjust(int v, int t)
{
int V = v, s = v >> 31;
V ^= s;
V -= s;
if (V-t-1 >= (unsigned)(t-1))
return v;
V = 2*t - V;
V += s;
V ^= s;
return V;
}
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_hv2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
int stride, int delta, int16_t weight)
{
s->dsp.put_pixels_tab[1][0](dst, src, stride, 8);
s->dsp.biweight_h264_pixels_tab[3](dst, src+delta, stride, 2,
8-weight, weight, 0);
}
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] = 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(vp56_context_t *s, uint8_t *dst, uint8_t *src,
int stride, int h_weight, int v_weight)
{
uint8_t *tmp = s->edge_emu_buffer+16;
int x, xmax;
s->dsp.put_pixels_tab[1][0](tmp, src, stride, 8);
s->dsp.biweight_h264_pixels_tab[3](tmp, src+1, stride, 2,
8-h_weight, h_weight, 0);
/* we need a 8x9 block to do vertical filter, so compute one more line */
for (x=8*stride, xmax=x+8; x<xmax; x++)
tmp[x] = (src[x]*(8-h_weight) + src[x+1]*h_weight + 4) >> 3;
s->dsp.put_pixels_tab[1][0](dst, tmp, stride, 8);
s->dsp.biweight_h264_pixels_tab[3](dst, tmp+stride, stride, 2,
8-v_weight, v_weight, 0);
}
static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
const int16_t *h_weights,const int16_t *v_weights)
{
int x, y;
int tmp[8*11];
int *t = tmp;
src -= stride;
for (y=0; y<11; y++) {
for (x=0; x<8; x++) {
t[x] = clip_uint8(( src[x-1] * h_weights[0]
+ src[x ] * h_weights[1]
+ src[x+1] * h_weights[2]
+ src[x+2] * h_weights[3] + 64) >> 7);
}
src += stride;
t += 8;
}
t = tmp + 8;
for (y=0; y<8; y++) {
for (x=0; x<8; x++) {
dst[x] = clip_uint8(( t[x-8 ] * v_weights[0]
+ t[x ] * v_weights[1]
+ t[x+8 ] * v_weights[2]
+ t[x+16] * v_weights[3] + 64) >> 7);
}
dst += stride;
t += 8;
}
}
static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
int offset1, int offset2, int stride,
vp56_mv_t 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 if ((mv.x^mv.y) >> 31) { /* lower-left or upper-right combine */
vp6_filter_diag4(dst, src+offset1-1, stride,
vp6_block_copy_filter[select][x8],
vp6_block_copy_filter[select][y8]);
} else { /* lower-right or upper-left combine */
vp6_filter_diag4(dst, src+offset1, stride,
vp6_block_copy_filter[select][x8],
vp6_block_copy_filter[select][y8]);
}
} else {
if (!y8) { /* left or right combine */
vp6_filter_hv2(s, dst, src+offset1, stride, 1, x8);
} else if (!x8) { /* above or below combine */
vp6_filter_hv2(s, dst, src+offset1, stride, stride, y8);
} else if ((mv.x^mv.y) >> 31) { /* lower-left or upper-right combine */
vp6_filter_diag2(s, dst, src+offset1-1, stride, x8, y8);
} else { /* lower-right or upper-left combine */
vp6_filter_diag2(s, dst, src+offset1, stride, x8, y8);
}
}
}
static int vp6_decode_init(AVCodecContext *avctx)
{
vp56_context_t *s = avctx->priv_data;
vp56_init(s, avctx, avctx->codec->id == CODEC_ID_VP6);
s->vp56_coord_div = vp6_coord_div;
s->parse_vector_adjustment = vp6_parse_vector_adjustment;
s->adjust = vp6_adjust;
s->filter = vp6_filter;
s->parse_coeff = vp6_parse_coeff;
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;
}
AVCodec vp6_decoder = {
"vp6",
CODEC_TYPE_VIDEO,
CODEC_ID_VP6,
sizeof(vp56_context_t),
vp6_decode_init,
NULL,
vp56_free,
vp56_decode_frame,
};
/* flash version, not flipped upside-down */
AVCodec vp6f_decoder = {
"vp6f",
CODEC_TYPE_VIDEO,
CODEC_ID_VP6F,
sizeof(vp56_context_t),
vp6_decode_init,
NULL,
vp56_free,
vp56_decode_frame,
};
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