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add support for VP6 with huffman encoded blocks

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closes issue 104

Originally committed as revision 10737 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2007-10-14 22:30:59 +00:00
parent 437c2079b7
commit f28b10483a
6 changed files with 148 additions and 13 deletions
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6
libavcodec/Makefile
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@ -195,9 +195,9 @@ OBJS-$(CONFIG_VORBIS_DECODER) += vorbis_dec.o vorbis.o vorbis_data.o xi
OBJS-$(CONFIG_VORBIS_ENCODER) += vorbis_enc.o vorbis.o vorbis_data.o mdct.o fft.o
OBJS-$(CONFIG_VP3_DECODER) += vp3.o vp3dsp.o
OBJS-$(CONFIG_VP5_DECODER) += vp5.o vp56.o vp56data.o vp3dsp.o
OBJS-$(CONFIG_VP6_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o
OBJS-$(CONFIG_VP6A_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o
OBJS-$(CONFIG_VP6F_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o
OBJS-$(CONFIG_VP6_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o huffman.o
OBJS-$(CONFIG_VP6A_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o huffman.o
OBJS-$(CONFIG_VP6F_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o huffman.o
OBJS-$(CONFIG_VQA_DECODER) += vqavideo.o
OBJS-$(CONFIG_WAVPACK_DECODER) += wavpack.o
OBJS-$(CONFIG_WMAV1_DECODER) += wmadec.o wma.o mdct.o fft.o

2
libavcodec/vp5.c
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@ -205,7 +205,7 @@ static void vp5_parse_coeff(vp56_context_t *s)
s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4;
idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
sign = vp56_rac_get(c);
coeff = vp56_coeff_bias[idx];
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 {

8
libavcodec/vp56.h
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@ -157,6 +157,14 @@ struct vp56_context {
vp56_model_t *modelp;
vp56_model_t models[2];
/* huffman decoding */
int use_huffman;
GetBitContext gb;
VLC dccv_vlc[2];
VLC runv_vlc[2];
VLC ract_vlc[2][3][6];
unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
};

2
libavcodec/vp56data.c
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@ -62,5 +62,5 @@ const vp56_tree_t vp56_pc_tree[] = {
{ 2,10}, {-4}, {-5},
};
const uint8_t vp56_coeff_bias[] = { 5, 7, 11, 19, 35, 67 };
const uint8_t vp56_coeff_bias[] = { 0, 1, 2, 3, 4, 5, 7, 11, 19, 35, 67 };
const uint8_t vp56_coeff_bit_length[] = { 0, 1, 2, 3, 4, 10 };

135
libavcodec/vp6.c
View File

@ -30,6 +30,7 @@
#include "avcodec.h"
#include "dsputil.h"
#include "bitstream.h"
#include "huffman.h"
#include "mpegvideo.h"
#include "vp56.h"
@ -37,6 +38,9 @@
#include "vp6data.h"
static void vp6_parse_coeff(vp56_context_t *s);
static void vp6_parse_coeff_huffman(vp56_context_t *s);
static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
int *golden_frame)
{
@ -126,14 +130,19 @@ static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
s->filter_selection = 16;
}
if (vp56_rac_get(c))
av_log(s->avctx, AV_LOG_WARNING,
"alternative entropy decoding not supported\n");
s->use_huffman = vp56_rac_get(c);
s->parse_coeff = vp6_parse_coeff;
if (coeff_offset) {
vp56_init_range_decoder(&s->cc, buf+coeff_offset,
buf_size-coeff_offset);
s->ccp = &s->cc;
buf += coeff_offset;
buf_size -= coeff_offset;
if (s->use_huffman) {
s->parse_coeff = vp6_parse_coeff_huffman;
init_get_bits(&s->gb, buf, buf_size);
} else {
vp56_init_range_decoder(&s->cc, buf, buf_size);
s->ccp = &s->cc;
}
} else {
s->ccp = &s->c;
}
@ -194,6 +203,31 @@ static void vp6_parse_vector_models(vp56_context_t *s)
model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
}
static int vp6_huff_cmp(const void *va, const void *vb)
{
const Node *a = va, *b = vb;
return a->count >= b->count;
}
static void vp6_build_huff_tree(vp56_context_t *s, uint8_t coeff_model[],
const uint8_t *map, unsigned size, VLC *vlc)
{
Node nodes[2*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;
}
/* then build the huffman tree accodring to probabilities */
ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp, 1);
}
static void vp6_parse_coeff_models(vp56_context_t *s)
{
vp56_range_coder_t *c = &s->c;
@ -237,11 +271,26 @@ static void vp6_parse_coeff_models(vp56_context_t *s)
model->coeff_ract[pt][ct][cg][node] = def_prob[node];
}
if (s->use_huffman) {
for (pt=0; pt<2; pt++) {
vp6_build_huff_tree(s, model->coeff_dccv[pt],
vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
vp6_build_huff_tree(s, model->coeff_runv[pt],
vp6_huff_run_map, 9, &s->runv_vlc[pt]);
for (ct=0; ct<3; ct++)
for (cg = 0; cg < 6; cg++)
vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
vp6_huff_coeff_map, 12,
&s->ract_vlc[pt][ct][cg]);
}
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);
}
}
static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
@ -282,6 +331,77 @@ static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
}
}
/**
* Read number of consecutive blocks with null DC or AC.
* This value is < 74.
*/
static unsigned vp6_get_nb_null(vp56_context_t *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 void vp6_parse_coeff_huffman(vp56_context_t *s)
{
vp56_model_t *model = s->modelp;
uint8_t *permute = s->scantable.permutated;
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; coeff_idx<64; ) {
int run = 1;
if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
s->nb_null[coeff_idx][pt]--;
if (coeff_idx)
break;
} else {
coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
if (coeff == 0) {
if (coeff_idx) {
int pt = (coeff_idx >= 6);
run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 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 = 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;
cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
vlc_coeff = &s->ract_vlc[pt][ct][cg];
}
}
}
static void vp6_parse_coeff(vp56_context_t *s)
{
vp56_range_coder_t *c = s->ccp;
@ -309,7 +429,7 @@ static void vp6_parse_coeff(vp56_context_t *s)
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, model1);
coeff = vp56_coeff_bias[idx];
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 {
@ -500,7 +620,6 @@ static int vp6_decode_init(AVCodecContext *avctx)
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;

8
libavcodec/vp6data.h
View File

@ -297,4 +297,12 @@ static const vp56_tree_t vp6_pcr_tree[] = {
static const uint8_t vp6_coord_div[] = { 4, 4, 4, 4, 8, 8 };
static const uint8_t vp6_huff_coeff_map[] = {
13, 14, 11, 0, 1, 15, 16, 18, 2, 17, 3, 4, 19, 20, 5, 6, 21, 22, 7, 8, 9, 10
};
static const uint8_t vp6_huff_run_map[] = {
10, 13, 11, 12, 0, 1, 2, 3, 14, 8, 15, 16, 4, 5, 6, 7
};
#endif /* VP6DATA_H */