FFmpeg/libavcodec/vp6.c
Peter Ross d8ebfd1bdf avcodec/vp6: select idct based (loosely) on number of coefficients decoded
The VP3/4/5/6 reference decoders all use three IDCT versions: one for the
DC-only case, another for blocks with more than 10 coefficients, and an
optimised one for blocks with up to 10 AC coefficents. VP6 relies on the
sparse 10 coefficient version, and without it, IDCT drift occurs.

Fixes: https://trac.ffmpeg.org/ticket/1282

Signed-off-by: Peter Ross <pross@xvid.org>
2019-01-26 23:49:09 +11:00

743 lines
25 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
* VP6 compatible video decoder
*
* The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
* - upper 4 bits: difference between encoded width and visible width
* - lower 4 bits: difference between encoded height and visible height
*/
#include <stdlib.h>
#include "avcodec.h"
#include "get_bits.h"
#include "huffman.h"
#include "internal.h"
#include "vp56.h"
#include "vp56data.h"
#include "vp6data.h"
#define VP6_MAX_HUFF_SIZE 12
static int vp6_parse_coeff(VP56Context *s);
static int vp6_parse_coeff_huffman(VP56Context *s);
static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
{
VP56RangeCoder *c = &s->c;
int parse_filter_info = 0;
int coeff_offset = 0;
int vrt_shift = 0;
int sub_version;
int rows, cols;
int res = 0;
int ret;
int separated_coeff = buf[0] & 1;
s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
ff_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 AVERROR_INVALIDDATA;
s->filter_header = buf[1] & 0x06;
if (buf[1] & 1) {
avpriv_report_missing_feature(s->avctx, "Interlacing");
return AVERROR_PATCHWELCOME;
}
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 (!rows || !cols) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
return AVERROR_INVALIDDATA;
}
if (!s->macroblocks || /* first frame */
16*cols != s->avctx->coded_width ||
16*rows != s->avctx->coded_height) {
if (s->avctx->extradata_size == 0 &&
FFALIGN(s->avctx->width, 16) == 16 * cols &&
FFALIGN(s->avctx->height, 16) == 16 * rows) {
// We assume this is properly signalled container cropping,
// in an F4V file. Just set the coded_width/height, don't
// touch the cropped ones.
s->avctx->coded_width = 16 * cols;
s->avctx->coded_height = 16 * rows;
} else {
ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
if (ret < 0)
return ret;
if (s->avctx->extradata_size == 1) {
s->avctx->width -= s->avctx->extradata[0] >> 4;
s->avctx->height -= s->avctx->extradata[0] & 0x0F;
}
}
res = VP56_SIZE_CHANGE;
}
ret = ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
if (ret < 0)
goto fail;
vp56_rac_gets(c, 2);
parse_filter_info = s->filter_header;
if (sub_version < 8)
vrt_shift = 5;
s->sub_version = sub_version;
s->golden_frame = 0;
} else {
if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
return AVERROR_INVALIDDATA;
if (separated_coeff || !s->filter_header) {
coeff_offset = AV_RB16(buf+1) - 2;
buf += 2;
buf_size -= 2;
}
ret = ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
if (ret < 0)
return ret;
s->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;
}
s->use_huffman = vp56_rac_get(c);
s->parse_coeff = vp6_parse_coeff;
if (coeff_offset) {
buf += coeff_offset;
buf_size -= coeff_offset;
if (buf_size < 0) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (s->use_huffman) {
s->parse_coeff = vp6_parse_coeff_huffman;
init_get_bits(&s->gb, buf, buf_size<<3);
} else {
ret = ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
if (ret < 0)
goto fail;
s->ccp = &s->cc;
}
} else {
s->ccp = &s->c;
}
return res;
fail:
if (res == VP56_SIZE_CHANGE)
ff_set_dimensions(s->avctx, 0, 0);
return ret;
}
static void vp6_coeff_order_table_init(VP56Context *s)
{
int i, pos, idx = 1;
s->modelp->coeff_index_to_pos[0] = 0;
for (i=0; i<16; i++)
for (pos=1; pos<64; pos++)
if (s->modelp->coeff_reorder[pos] == i)
s->modelp->coeff_index_to_pos[idx++] = pos;
for (idx = 0; idx < 64; idx++) {
int max = 0;
for (i = 0; i <= idx; i++) {
int v = s->modelp->coeff_index_to_pos[i];
if (v > max)
max = v;
}
if (s->sub_version > 6)
max++;
s->modelp->coeff_index_to_idct_selector[idx] = max;
}
}
static void vp6_default_models_init(VP56Context *s)
{
VP56Model *model = s->modelp;
model->vector_dct[0] = 0xA2;
model->vector_dct[1] = 0xA4;
model->vector_sig[0] = 0x80;
model->vector_sig[1] = 0x80;
memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
vp6_coeff_order_table_init(s);
}
static void vp6_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, vp6_sig_dct_pct[comp][0]))
model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
if (vp56_rac_get_prob_branchy(c, vp6_sig_dct_pct[comp][1]))
model->vector_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_branchy(c, vp6_pdv_pct[comp][node]))
model->vector_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_branchy(c, vp6_fdv_pct[comp][node]))
model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
}
/* nodes must ascend by count, but with descending symbol order */
static int vp6_huff_cmp(const void *va, const void *vb)
{
const Node *a = va, *b = vb;
return (a->count - b->count)*16 + (b->sym - a->sym);
}
static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
const uint8_t *map, unsigned size, VLC *vlc)
{
Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
int a, b, i;
/* first compute probabilities from model */
tmp[0].count = 256;
for (i=0; i<size-1; i++) {
a = tmp[i].count * coeff_model[i] >> 8;
b = tmp[i].count * (255 - coeff_model[i]) >> 8;
nodes[map[2*i ]].count = a + !a;
nodes[map[2*i+1]].count = b + !b;
}
ff_free_vlc(vlc);
/* then build the huffman tree according to probabilities */
return ff_huff_build_tree(s->avctx, vlc, size, FF_HUFFMAN_BITS,
nodes, vp6_huff_cmp,
FF_HUFFMAN_FLAG_HNODE_FIRST);
}
static int vp6_parse_coeff_models(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
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_branchy(c, vp6_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];
}
if (vp56_rac_get(c)) {
for (pos=1; pos<64; pos++)
if (vp56_rac_get_prob_branchy(c, vp6_coeff_reorder_pct[pos]))
model->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_branchy(c, vp6_runv_pct[cg][node]))
model->coeff_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_branchy(c, vp6_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];
}
if (s->use_huffman) {
for (pt=0; pt<2; pt++) {
if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
return -1;
if (vp6_build_huff_tree(s, model->coeff_runv[pt],
vp6_huff_run_map, 9, &s->runv_vlc[pt]))
return -1;
for (ct=0; ct<3; ct++)
for (cg = 0; cg < 6; cg++)
if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
vp6_huff_coeff_map, 12,
&s->ract_vlc[pt][ct][cg]))
return -1;
}
memset(s->nb_null, 0, sizeof(s->nb_null));
} else {
/* coeff_dcct is a linear combination of coeff_dccv */
for (pt=0; pt<2; pt++)
for (ctx=0; ctx<3; ctx++)
for (node=0; node<5; node++)
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);
}
return 0;
}
static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
int comp;
*vect = (VP56mv) {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_branchy(c, model->vector_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, model->vector_fdv[comp][j])<<j;
}
if (delta & 0xF0)
delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
else
delta |= 8;
} else {
delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
model->vector_pdv[comp]);
}
if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp]))
delta = -delta;
if (!comp)
vect->x += delta;
else
vect->y += delta;
}
}
/**
* Read number of consecutive blocks with null DC or AC.
* This value is < 74.
*/
static unsigned vp6_get_nb_null(VP56Context *s)
{
unsigned val = get_bits(&s->gb, 2);
if (val == 2)
val += get_bits(&s->gb, 2);
else if (val == 3) {
val = get_bits1(&s->gb) << 2;
val = 6+val + get_bits(&s->gb, 2+val);
}
return val;
}
static int vp6_parse_coeff_huffman(VP56Context *s)
{
VP56Model *model = s->modelp;
uint8_t *permute = s->idct_scantable;
VLC *vlc_coeff;
int coeff, sign, coeff_idx;
int b, cg, idx;
int pt = 0; /* plane type (0 for Y, 1 for U or V) */
for (b=0; b<6; b++) {
int ct = 0; /* code type */
if (b > 3) pt = 1;
vlc_coeff = &s->dccv_vlc[pt];
for (coeff_idx = 0;;) {
int run = 1;
if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
s->nb_null[coeff_idx][pt]--;
if (coeff_idx)
break;
} else {
if (get_bits_left(&s->gb) <= 0)
return AVERROR_INVALIDDATA;
coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3);
if (coeff == 0) {
if (coeff_idx) {
int pt = (coeff_idx >= 6);
run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3);
if (run >= 9)
run += get_bits(&s->gb, 6);
} else
s->nb_null[0][pt] = vp6_get_nb_null(s);
ct = 0;
} else if (coeff == 11) { /* end of block */
if (coeff_idx == 1) /* first AC coeff ? */
s->nb_null[1][pt] = vp6_get_nb_null(s);
break;
} else {
int coeff2 = ff_vp56_coeff_bias[coeff];
if (coeff > 4)
coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
ct = 1 + (coeff2 > 1);
sign = get_bits1(&s->gb);
coeff2 = (coeff2 ^ -sign) + sign;
if (coeff_idx)
coeff2 *= s->dequant_ac;
idx = model->coeff_index_to_pos[coeff_idx];
s->block_coeff[b][permute[idx]] = coeff2;
}
}
coeff_idx+=run;
if (coeff_idx >= 64)
break;
cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
vlc_coeff = &s->ract_vlc[pt][ct][cg];
}
s->idct_selector[b] = model->coeff_index_to_idct_selector[FFMIN(coeff_idx, 63)];
}
return 0;
}
static int vp6_parse_coeff(VP56Context *s)
{
VP56RangeCoder *c = s->ccp;
VP56Model *model = s->modelp;
uint8_t *permute = s->idct_scantable;
uint8_t *model1, *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) */
if (c->end <= c->buffer && c->bits >= 0) {
av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp6_parse_coeff\n");
return AVERROR_INVALIDDATA;
}
for (b=0; b<6; b++) {
int ct = 1; /* code type */
int run = 1;
if (b > 3) pt = 1;
ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc
+ 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 ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) {
/* parse a coeff */
if (vp56_rac_get_prob_branchy(c, model2[2])) {
if (vp56_rac_get_prob_branchy(c, model2[3])) {
idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
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]);
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_branchy(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;
}
}
coeff_idx += run;
if (coeff_idx >= 64)
break;
cg = vp6_coeff_groups[coeff_idx];
model1 = model2 = model->coeff_ract[pt][ct][cg];
}
s->left_block[ff_vp56_b6to4[b]].not_null_dc =
s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
s->idct_selector[b] = model->coeff_index_to_idct_selector[FFMIN(coeff_idx, 63)];
}
return 0;
}
static int vp6_block_variance(uint8_t *src, ptrdiff_t 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, ptrdiff_t 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,
ptrdiff_t stride, int h_weight, int v_weight)
{
uint8_t *tmp = s->edge_emu_buffer+16;
s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
s->h264chroma.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, ptrdiff_t 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->h264chroma.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 void vp6_decode_init_context(VP56Context *s);
static av_cold int vp6_decode_init(AVCodecContext *avctx)
{
VP56Context *s = avctx->priv_data;
int ret;
if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6,
avctx->codec->id == AV_CODEC_ID_VP6A)) < 0)
return ret;
ff_vp6dsp_init(&s->vp56dsp);
vp6_decode_init_context(s);
if (s->has_alpha) {
s->alpha_context = av_mallocz(sizeof(VP56Context));
ff_vp56_init_context(avctx, s->alpha_context,
s->flip == -1, s->has_alpha);
ff_vp6dsp_init(&s->alpha_context->vp56dsp);
vp6_decode_init_context(s->alpha_context);
}
return 0;
}
static av_cold void vp6_decode_init_context(VP56Context *s)
{
s->deblock_filtering = 0;
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;
}
static av_cold void vp6_decode_free_context(VP56Context *s);
static av_cold int vp6_decode_free(AVCodecContext *avctx)
{
VP56Context *s = avctx->priv_data;
ff_vp56_free(avctx);
vp6_decode_free_context(s);
if (s->alpha_context) {
ff_vp56_free_context(s->alpha_context);
vp6_decode_free_context(s->alpha_context);
av_freep(&s->alpha_context);
}
return 0;
}
static av_cold void vp6_decode_free_context(VP56Context *s)
{
int pt, ct, cg;
for (pt=0; pt<2; pt++) {
ff_free_vlc(&s->dccv_vlc[pt]);
ff_free_vlc(&s->runv_vlc[pt]);
for (ct=0; ct<3; ct++)
for (cg=0; cg<6; cg++)
ff_free_vlc(&s->ract_vlc[pt][ct][cg]);
}
}
AVCodec ff_vp6_decoder = {
.name = "vp6",
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_VP6,
.priv_data_size = sizeof(VP56Context),
.init = vp6_decode_init,
.close = vp6_decode_free,
.decode = ff_vp56_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
/* flash version, not flipped upside-down */
AVCodec ff_vp6f_decoder = {
.name = "vp6f",
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_VP6F,
.priv_data_size = sizeof(VP56Context),
.init = vp6_decode_init,
.close = vp6_decode_free,
.decode = ff_vp56_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
/* flash version, not flipped upside-down, with alpha channel */
AVCodec ff_vp6a_decoder = {
.name = "vp6a",
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_VP6A,
.priv_data_size = sizeof(VP56Context),
.init = vp6_decode_init,
.close = vp6_decode_free,
.decode = ff_vp56_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS,
};