VP5 and VP6 video decoder

Originally committed as revision 6213 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 512 insertions, 0 deletions

diff --git a/libavcodec/vp6.c b/libavcodec/vp6.c
new file mode 100644
index 0000000000..bf528f826a
--- /dev/null
+++ b/libavcodec/vp6.c
@@ -0,0 +1,512 @@
+/**
+ * @file vp6.c
+ * VP6 compatible video decoder
+ *
+ * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * This library 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.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <stdlib.h>
+#include <inttypes.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;
+    int rows, cols;
+    int res = 1;
+
+    if (buf[0] & 1)
+        return 0;
+
+    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) {
+        if ((buf[1] & 0xFE) != 0x46)  /* would be 0x36 for VP61 */
+            return 0;
+        if (buf[1] & 1) {
+            av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
+            return 0;
+        }
+
+        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);
+            res = 2;
+        }
+
+        vp56_init_range_decoder(c, buf+6, buf_size-6);
+        vp56_rac_gets(c, 2);
+
+        parse_filter_info = 1;
+    } else {
+        vp56_init_range_decoder(c, buf+1, buf_size-1);
+
+        *golden_frame = vp56_rac_get(c);
+        s->deblock_filtering = vp56_rac_get(c);
+        if (s->deblock_filtering)
+            vp56_rac_get(c);
+        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);
+            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;
+        }
+        s->filter_selection = vp56_rac_gets(c, 4);
+    }
+
+    vp56_rac_get(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 *vector)
+{
+    vp56_range_coder_t *c = &s->c;
+    int comp;
+
+    *vector = (vp56_mv_t) {0,0};
+    if (s->vector_candidate_pos < 2)
+        *vector = 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)
+            vector->x += delta;
+        else
+            vector->y += delta;
+    }
+}
+
+static void vp6_parse_coeff(vp56_context_t *s)
+{
+    vp56_range_coder_t *c = &s->c;
+    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) / (16*16);
+}
+
+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 &&
+                (ABS(mv.x) > s->max_vector_length ||
+                 ABS(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,
+};