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https://gitee.com/openharmony/third_party_ffmpeg
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add support for VP6 with huffman encoded blocks
closes issue 104 Originally committed as revision 10737 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs
parent
437c2079b7
commit
f28b10483a
@ -195,9 +195,9 @@ OBJS-$(CONFIG_VORBIS_DECODER) += vorbis_dec.o vorbis.o vorbis_data.o xi
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OBJS-$(CONFIG_VORBIS_ENCODER) += vorbis_enc.o vorbis.o vorbis_data.o mdct.o fft.o
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OBJS-$(CONFIG_VP3_DECODER) += vp3.o vp3dsp.o
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OBJS-$(CONFIG_VP5_DECODER) += vp5.o vp56.o vp56data.o vp3dsp.o
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OBJS-$(CONFIG_VP6_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o
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OBJS-$(CONFIG_VP6A_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o
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OBJS-$(CONFIG_VP6F_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o
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OBJS-$(CONFIG_VP6_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o huffman.o
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OBJS-$(CONFIG_VP6A_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o huffman.o
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OBJS-$(CONFIG_VP6F_DECODER) += vp6.o vp56.o vp56data.o vp3dsp.o huffman.o
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OBJS-$(CONFIG_VQA_DECODER) += vqavideo.o
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OBJS-$(CONFIG_WAVPACK_DECODER) += wavpack.o
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OBJS-$(CONFIG_WMAV1_DECODER) += wmadec.o wma.o mdct.o fft.o
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@ -205,7 +205,7 @@ static void vp5_parse_coeff(vp56_context_t *s)
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s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4;
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idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
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sign = vp56_rac_get(c);
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coeff = vp56_coeff_bias[idx];
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coeff = vp56_coeff_bias[idx+5];
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for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
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coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
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} else {
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@ -157,6 +157,14 @@ struct vp56_context {
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vp56_model_t *modelp;
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vp56_model_t models[2];
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/* huffman decoding */
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int use_huffman;
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GetBitContext gb;
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VLC dccv_vlc[2];
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VLC runv_vlc[2];
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VLC ract_vlc[2][3][6];
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unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
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};
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@ -62,5 +62,5 @@ const vp56_tree_t vp56_pc_tree[] = {
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{ 2,10}, {-4}, {-5},
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};
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const uint8_t vp56_coeff_bias[] = { 5, 7, 11, 19, 35, 67 };
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const uint8_t vp56_coeff_bias[] = { 0, 1, 2, 3, 4, 5, 7, 11, 19, 35, 67 };
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const uint8_t vp56_coeff_bit_length[] = { 0, 1, 2, 3, 4, 10 };
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133
libavcodec/vp6.c
133
libavcodec/vp6.c
@ -30,6 +30,7 @@
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#include "avcodec.h"
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#include "dsputil.h"
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#include "bitstream.h"
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#include "huffman.h"
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#include "mpegvideo.h"
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#include "vp56.h"
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@ -37,6 +38,9 @@
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#include "vp6data.h"
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static void vp6_parse_coeff(vp56_context_t *s);
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static void vp6_parse_coeff_huffman(vp56_context_t *s);
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static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
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int *golden_frame)
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{
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@ -126,14 +130,19 @@ static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
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s->filter_selection = 16;
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}
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if (vp56_rac_get(c))
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av_log(s->avctx, AV_LOG_WARNING,
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"alternative entropy decoding not supported\n");
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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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vp56_init_range_decoder(&s->cc, buf+coeff_offset,
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buf_size-coeff_offset);
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buf += coeff_offset;
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buf_size -= coeff_offset;
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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);
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} else {
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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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@ -194,6 +203,31 @@ static void vp6_parse_vector_models(vp56_context_t *s)
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model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
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}
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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;
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}
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static void vp6_build_huff_tree(vp56_context_t *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*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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/* then build the huffman tree accodring to probabilities */
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ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp, 1);
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}
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static void vp6_parse_coeff_models(vp56_context_t *s)
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{
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vp56_range_coder_t *c = &s->c;
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@ -237,12 +271,27 @@ static void vp6_parse_coeff_models(vp56_context_t *s)
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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(vp56_context_t *s, vp56_mv_t *vect)
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{
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@ -282,6 +331,77 @@ static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
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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(vp56_context_t *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(vp56_context_t *s)
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{
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vp56_model_t *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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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(vp56_context_t *s)
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{
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vp56_range_coder_t *c = s->ccp;
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@ -309,7 +429,7 @@ static void vp6_parse_coeff(vp56_context_t *s)
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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);
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coeff = vp56_coeff_bias[idx];
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coeff = vp56_coeff_bias[idx+5];
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for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
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coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
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} else {
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@ -500,7 +620,6 @@ static int vp6_decode_init(AVCodecContext *avctx)
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s->parse_vector_adjustment = vp6_parse_vector_adjustment;
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s->adjust = vp6_adjust;
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s->filter = vp6_filter;
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s->parse_coeff = vp6_parse_coeff;
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s->default_models_init = vp6_default_models_init;
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s->parse_vector_models = vp6_parse_vector_models;
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s->parse_coeff_models = vp6_parse_coeff_models;
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@ -297,4 +297,12 @@ static const vp56_tree_t vp6_pcr_tree[] = {
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static const uint8_t vp6_coord_div[] = { 4, 4, 4, 4, 8, 8 };
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static const uint8_t vp6_huff_coeff_map[] = {
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13, 14, 11, 0, 1, 15, 16, 18, 2, 17, 3, 4, 19, 20, 5, 6, 21, 22, 7, 8, 9, 10
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};
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static const uint8_t vp6_huff_run_map[] = {
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10, 13, 11, 12, 0, 1, 2, 3, 14, 8, 15, 16, 4, 5, 6, 7
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};
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#endif /* VP6DATA_H */
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