VP5 and VP6 video decoder

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

1 files changed, 289 insertions, 0 deletions

diff --git a/libavcodec/vp5.c b/libavcodec/vp5.c
new file mode 100644
index 0000000000..f87e91d2a2
--- /dev/null
+++ b/libavcodec/vp5.c
@@ -0,0 +1,289 @@
+/**
+ * @file vp5.c
+ * VP5 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 <string.h>
+#include <inttypes.h>
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "bitstream.h"
+#include "mpegvideo.h"
+
+#include "vp56.h"
+#include "vp56data.h"
+#include "vp5data.h"
+
+
+static int vp5_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
+                            int *golden_frame)
+{
+    vp56_range_coder_t *c = &s->c;
+    int rows, cols;
+
+    vp56_init_range_decoder(&s->c, buf, buf_size);
+    s->frames[VP56_FRAME_CURRENT].key_frame = !vp56_rac_get(c);
+    vp56_rac_get(c);
+    vp56_init_dequant(s, vp56_rac_gets(c, 6));
+    if (s->frames[VP56_FRAME_CURRENT].key_frame)
+    {
+        vp56_rac_gets(c, 8);
+        if(vp56_rac_gets(c, 5) > 5)
+            return 0;
+        vp56_rac_gets(c, 2);
+        if (vp56_rac_get(c)) {
+            av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
+            return 0;
+        }
+        rows = vp56_rac_gets(c, 8);  /* number of stored macroblock rows */
+        cols = vp56_rac_gets(c, 8);  /* number of stored macroblock cols */
+        vp56_rac_gets(c, 8);  /* number of displayed macroblock rows */
+        vp56_rac_gets(c, 8);  /* number of displayed macroblock cols */
+        vp56_rac_gets(c, 2);
+        if (16*cols != s->avctx->coded_width ||
+            16*rows != s->avctx->coded_height) {
+            avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
+            return 2;
+        }
+    }
+    return 1;
+}
+
+/* Gives very similar result than the vp6 version except in a few cases */
+static int vp5_adjust(int v, int t)
+{
+    int s2, s1 = v >> 31;
+    v ^= s1;
+    v -= s1;
+    v *= v < 2*t;
+    v -= t;
+    s2 = v >> 31;
+    v ^= s2;
+    v -= s2;
+    v = t - v;
+    v += s1;
+    v ^= s1;
+    return v;
+}
+
+static void vp5_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vector)
+{
+    vp56_range_coder_t *c = &s->c;
+    int comp, di;
+
+    for (comp=0; comp<2; comp++) {
+        int delta = 0;
+        if (vp56_rac_get_prob(c, s->vector_model_dct[comp])) {
+            int sign = vp56_rac_get_prob(c, s->vector_model_sig[comp]);
+            di  = vp56_rac_get_prob(c, s->vector_model_pdi[comp][0]);
+            di |= vp56_rac_get_prob(c, s->vector_model_pdi[comp][1]) << 1;
+            delta = vp56_rac_get_tree(c, vp56_pva_tree,
+                                      s->vector_model_pdv[comp]);
+            delta = di | (delta << 2);
+            delta = (delta ^ -sign) + sign;
+        }
+        if (!comp)
+            vector->x = delta;
+        else
+            vector->y = delta;
+    }
+}
+
+static void vp5_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, vp5_vmc_pct[comp][0]))
+            s->vector_model_dct[comp] = vp56_rac_gets_nn(c, 7);
+        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
+            s->vector_model_sig[comp] = vp56_rac_gets_nn(c, 7);
+        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
+            s->vector_model_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
+        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
+            s->vector_model_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
+    }
+
+    for (comp=0; comp<2; comp++)
+        for (node=0; node<7; node++)
+            if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
+                s->vector_model_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
+}
+
+static void vp5_parse_coeff_models(vp56_context_t *s)
+{
+    vp56_range_coder_t *c = &s->c;
+    uint8_t def_prob[11];
+    int node, cg, ctx;
+    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, vp5_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];
+            }
+
+    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, vp5_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<36; ctx++)
+            for (node=0; node<5; node++)
+                s->coeff_model_dcct[pt][ctx][node] = clip(((s->coeff_model_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254);
+
+    /* coeff_model_acct is a linear combination of coeff_model_ract */
+    for (ct=0; ct<3; ct++)
+        for (pt=0; pt<2; pt++)
+            for (cg=0; cg<3; cg++)
+                for (ctx=0; ctx<6; ctx++)
+                    for (node=0; node<5; node++)
+                        s->coeff_model_acct[pt][ct][cg][ctx][node] = clip(((s->coeff_model_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254);
+}
+
+static void vp5_parse_coeff(vp56_context_t *s)
+{
+    vp56_range_coder_t *c = &s->c;
+    uint8_t *permute = s->scantable.permutated;
+    uint8_t *model, *model2;
+    int coeff, sign, coeff_idx;
+    int b, i, cg, idx, ctx, ctx_last;
+    int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
+
+    for (b=0; b<6; b++) {
+        int ct = 1;    /* code type */
+
+        if (b > 3) pt = 1;
+
+        ctx = 6*s->coeff_ctx[vp56_b6to4[b]][0]
+              + 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 (vp56_rac_get_prob(c, model2[0])) {
+                if (vp56_rac_get_prob(c, model2[2])) {
+                    if (vp56_rac_get_prob(c, model2[3])) {
+                        s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4;
+                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model);
+                        sign = vp56_rac_get(c);
+                        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]);
+                            s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 3;
+                        } else {
+                            coeff = 2;
+                            s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 2;
+                        }
+                        sign = vp56_rac_get(c);
+                    }
+                    ct = 2;
+                } else {
+                    ct = 1;
+                    s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 1;
+                    sign = vp56_rac_get(c);
+                    coeff = 1;
+                }
+                coeff = (coeff ^ -sign) + sign;
+                if (coeff_idx)
+                    coeff *= s->dequant_ac;
+                s->block_coeff[b][permute[coeff_idx]] = coeff;
+            } else {
+                if (ct && !vp56_rac_get_prob(c, model2[1]))
+                    break;
+                ct = 0;
+                s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 0;
+            }
+
+            cg = vp5_coeff_groups[++coeff_idx];
+            ctx = s->coeff_ctx[vp56_b6to4[b]][coeff_idx];
+            model = s->coeff_model_ract[pt][ct][cg];
+            model2 = cg > 2 ? model : s->coeff_model_acct[pt][ct][cg][ctx];
+        }
+
+        ctx_last = FFMIN(s->coeff_ctx_last[vp56_b6to4[b]], 24);
+        s->coeff_ctx_last[vp56_b6to4[b]] = coeff_idx;
+        if (coeff_idx < ctx_last)
+            for (i=coeff_idx; i<=ctx_last; i++)
+                s->coeff_ctx[vp56_b6to4[b]][i] = 5;
+        s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[vp56_b6to4[b]][0];
+    }
+}
+
+static void vp5_default_models_init(vp56_context_t *s)
+{
+    int i;
+
+    for (i=0; i<2; i++) {
+        s->vector_model_sig[i] = 0x80;
+        s->vector_model_dct[i] = 0x80;
+        s->vector_model_pdi[i][0] = 0x55;
+        s->vector_model_pdi[i][1] = 0x80;
+    }
+    memcpy(s->mb_types_stats, vp56_def_mb_types_stats, sizeof(s->mb_types_stats));
+    memset(s->vector_model_pdv, 0x80, sizeof(s->vector_model_pdv));
+}
+
+static int vp5_decode_init(AVCodecContext *avctx)
+{
+    vp56_context_t *s = avctx->priv_data;
+
+    vp56_init(s, avctx, 1);
+    s->vp56_coord_div = vp5_coord_div;
+    s->parse_vector_adjustment = vp5_parse_vector_adjustment;
+    s->adjust = vp5_adjust;
+    s->parse_coeff = vp5_parse_coeff;
+    s->default_models_init = vp5_default_models_init;
+    s->parse_vector_models = vp5_parse_vector_models;
+    s->parse_coeff_models = vp5_parse_coeff_models;
+    s->parse_header = vp5_parse_header;
+
+    return 0;
+}
+
+AVCodec vp5_decoder = {
+    "vp5",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_VP5,
+    sizeof(vp56_context_t),
+    vp5_decode_init,
+    NULL,
+    vp56_free,
+    vp56_decode_frame,
+};