On2 VP7 decoder

Signed-off-by: Peter Ross <pross@xvid.org>
Reviewed-by: BBB
previous patch reviewed by jason
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 633 insertions, 126 deletions

diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index f13228670d..0c2f503ac6 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -1,10 +1,11 @@
 /*
- * VP8 compatible video decoder
+ * VP7/VP8 compatible video decoder
  *
  * Copyright (C) 2010 David Conrad
  * Copyright (C) 2010 Ronald S. Bultje
  * Copyright (C) 2010 Jason Garrett-Glaser
  * Copyright (C) 2012 Daniel Kang
+ * Copyright (C) 2014 Peter Ross
  *
  * This file is part of FFmpeg.
  *
@@ -35,6 +36,14 @@
 #   include "arm/vp8.h"
 #endif
 
+#if CONFIG_VP7_DECODER && CONFIG_VP8_DECODER
+#define VPX(vp7, f) (vp7 ? vp7_ ## f : vp8_ ## f)
+#elif CONFIG_VP7_DECODER
+#define VPX(vp7, f) vp7_ ## f
+#else // CONFIG_VP8_DECODER
+#define VPX(vp7, f) vp8_ ## f
+#endif
+
 static void free_buffers(VP8Context *s)
 {
     int i;
@@ -74,6 +83,7 @@ static void vp8_release_frame(VP8Context *s, VP8Frame *f)
     ff_thread_release_buffer(s->avctx, &f->tf);
 }
 
+#if CONFIG_VP8_DECODER
 static int vp8_ref_frame(VP8Context *s, VP8Frame *dst, VP8Frame *src)
 {
     int ret;
@@ -90,6 +100,7 @@ static int vp8_ref_frame(VP8Context *s, VP8Frame *dst, VP8Frame *src)
 
     return 0;
 }
+#endif
 
 
 static void vp8_decode_flush_impl(AVCodecContext *avctx, int free_mem)
@@ -151,7 +162,7 @@ static int update_dimensions(VP8Context *s, int width, int height)
     s->mb_width  = (s->avctx->coded_width +15) / 16;
     s->mb_height = (s->avctx->coded_height+15) / 16;
 
-    s->mb_layout = (avctx->active_thread_type == FF_THREAD_SLICE) && (FFMIN(s->num_coeff_partitions, avctx->thread_count) > 1);
+    s->mb_layout = s->vp7 || (avctx->active_thread_type == FF_THREAD_SLICE) && (FFMIN(s->num_coeff_partitions, avctx->thread_count) > 1);
     if (!s->mb_layout) { // Frame threading and one thread
         s->macroblocks_base       = av_mallocz((s->mb_width+s->mb_height*2+1)*sizeof(*s->macroblocks));
         s->intra4x4_pred_mode_top = av_mallocz(s->mb_width*4);
@@ -179,6 +190,8 @@ static int update_dimensions(VP8Context *s, int width, int height)
     return 0;
 }
 
+
+#if CONFIG_VP8_DECODER
 static void parse_segment_info(VP8Context *s)
 {
     VP56RangeCoder *c = &s->c;
@@ -249,8 +262,31 @@ static int setup_partitions(VP8Context *s, const uint8_t *buf, int buf_size)
 
     return 0;
 }
+#endif
+
+#if CONFIG_VP7_DECODER
+static void vp7_get_quants(VP8Context *s)
+{
+    VP56RangeCoder *c = &s->c;
+
+    int yac_qi  = vp8_rac_get_uint(c, 7);
+    int ydc_qi  = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
+    int y2dc_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
+    int y2ac_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
+    int uvdc_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
+    int uvac_qi = vp8_rac_get(c) ? vp8_rac_get_uint(c, 7) : yac_qi;
+
+    s->qmat[0].luma_qmul[0]    =       vp7_ydc_qlookup[ydc_qi];
+    s->qmat[0].luma_qmul[1]    =       vp7_yac_qlookup[yac_qi];
+    s->qmat[0].luma_dc_qmul[0] =       vp7_y2dc_qlookup[y2dc_qi];
+    s->qmat[0].luma_dc_qmul[1] =       vp7_y2ac_qlookup[y2ac_qi];
+    s->qmat[0].chroma_qmul[0]  = FFMIN(vp7_ydc_qlookup[uvdc_qi], 132);
+    s->qmat[0].chroma_qmul[1]  =       vp7_yac_qlookup[uvac_qi];
+}
+#endif
 
-static void get_quants(VP8Context *s)
+#if CONFIG_VP8_DECODER
+static void vp8_get_quants(VP8Context *s)
 {
     VP56RangeCoder *c = &s->c;
     int i, base_qi;
@@ -311,7 +347,53 @@ static VP56Frame ref_to_update(VP8Context *s, int update, VP56Frame ref)
     }
     return VP56_FRAME_NONE;
 }
+#endif
+
+static void vp78_reset_probability_tables(VP8Context *s)
+{
+    int i, j;
+    for (i = 0; i < 4; i++)
+        for (j = 0; j < 16; j++)
+            memcpy(s->prob->token[i][j], vp8_token_default_probs[i][vp8_coeff_band[j]],
+                   sizeof(s->prob->token[i][j]));
+}
+
+static void vp78_update_probability_tables(VP8Context *s)
+{
+    VP56RangeCoder *c = &s->c;
+    int i, j, k, l, m;
+
+    for (i = 0; i < 4; i++)
+        for (j = 0; j < 8; j++)
+            for (k = 0; k < 3; k++)
+                for (l = 0; l < NUM_DCT_TOKENS-1; l++)
+                    if (vp56_rac_get_prob_branchy(c, vp8_token_update_probs[i][j][k][l])) {
+                        int prob = vp8_rac_get_uint(c, 8);
+                        for (m = 0; vp8_coeff_band_indexes[j][m] >= 0; m++)
+                            s->prob->token[i][vp8_coeff_band_indexes[j][m]][k][l] = prob;
+                    }
+}
+
+static void vp78_update_pred16x16_pred8x8_mvc_probabilities(VP8Context *s)
+{
+    VP56RangeCoder *c = &s->c;
+    int i, j;
+
+    if (vp8_rac_get(c))
+        for (i = 0; i < 4; i++)
+            s->prob->pred16x16[i] = vp8_rac_get_uint(c, 8);
+    if (vp8_rac_get(c))
+        for (i = 0; i < 3; i++)
+            s->prob->pred8x8c[i]  = vp8_rac_get_uint(c, 8);
+
+    // 17.2 MV probability update
+    for (i = 0; i < 2; i++)
+        for (j = 0; j < (s->vp7 ? 17 : 19); j++)
+            if (vp56_rac_get_prob_branchy(c, vp8_mv_update_prob[i][j]))
+                s->prob->mvc[i][j] = vp8_rac_get_nn(c);
+}
 
+#if CONFIG_VP8_DECODER
 static void update_refs(VP8Context *s)
 {
     VP56RangeCoder *c = &s->c;
@@ -322,11 +404,182 @@ static void update_refs(VP8Context *s)
     s->update_golden = ref_to_update(s, update_golden, VP56_FRAME_GOLDEN);
     s->update_altref = ref_to_update(s, update_altref, VP56_FRAME_GOLDEN2);
 }
+#endif
+
+#if CONFIG_VP7_DECODER
+static void fade(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize, int width, int height, int alpha, int beta)
+{
+    int i, j;
+    for (j = 0; j < height; j++)
+        for (i = 0; i < width; i++) {
+            uint8_t y = src[j*src_linesize + i];
+            dst[j*dst_linesize + i] = av_clip_uint8(y + ((y * beta) >> 8) + alpha);
+        }
+}
+
+static int vp7_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
+{
+    VP56RangeCoder *c = &s->c;
+    int part1_size, hscale, vscale, i, j, ret;
+    int width  = s->avctx->width;
+    int height = s->avctx->height;
+
+    s->profile   =  (buf[0]>>1) & 7;
+    if (s->profile > 1) {
+        avpriv_request_sample(s->avctx, "Unknown profile %d", s->profile);
+        return AVERROR_INVALIDDATA;
+    }
+
+    s->keyframe  = !(buf[0] & 1);
+    s->invisible = 0;
+    part1_size   = AV_RL24(buf) >> 4;
+
+    buf      += 4 - s->profile;
+    buf_size -= 4 - s->profile;
+
+    memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab, sizeof(s->put_pixels_tab));
+
+    ff_vp56_init_range_decoder(c, buf, part1_size);
+    buf      += part1_size;
+    buf_size -= part1_size;
+
+    /* A. Dimension information (keyframes only) */
+    if (s->keyframe) {
+        width  = vp8_rac_get_uint(c, 12);
+        height = vp8_rac_get_uint(c, 12);
+        hscale = vp8_rac_get_uint(c, 2);
+        vscale = vp8_rac_get_uint(c, 2);
+        if (hscale || vscale)
+            avpriv_request_sample(s->avctx, "Upscaling");
+
+        s->update_golden = s->update_altref = VP56_FRAME_CURRENT;
+        vp78_reset_probability_tables(s);
+        memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter, sizeof(s->prob->pred16x16));
+        memcpy(s->prob->pred8x8c , vp8_pred8x8c_prob_inter , sizeof(s->prob->pred8x8c));
+        for (i = 0; i < 2; i++)
+            memcpy(s->prob->mvc[i], vp7_mv_default_prob[i], sizeof(vp7_mv_default_prob[i]));
+        memset(&s->segmentation, 0, sizeof(s->segmentation));
+        memset(&s->lf_delta, 0, sizeof(s->lf_delta));
+        memcpy(s->prob[0].scan, zigzag_scan, sizeof(s->prob[0].scan));
+    }
+
+    if (s->keyframe || s->profile > 0)
+        memset(s->inter_dc_pred, 0 , sizeof(s->inter_dc_pred));
+
+    /* B. Decoding information for all four macroblock-level features */
+    for (i = 0; i < 4; i++) {
+        s->feature_enabled[i] = vp8_rac_get(c);
+        if (s->feature_enabled[i]) {
+             s->feature_present_prob[i] = vp8_rac_get_uint(c, 8);
+
+             for (j = 0; j < 3; j++)
+                 s->feature_index_prob[i][j] = vp8_rac_get(c) ? vp8_rac_get_uint(c, 8) : 255;
+
+             if (vp7_feature_value_size[i])
+                 for (j = 0; j < 4; j++)
+                     s->feature_value[i][j] = vp8_rac_get(c) ? vp8_rac_get_uint(c, vp7_feature_value_size[s->profile][i]) : 0;
+        }
+    }
+
+    s->segmentation.enabled = 0;
+    s->segmentation.update_map = 0;
+    s->lf_delta.enabled = 0;
+
+    s->num_coeff_partitions = 1;
+    ff_vp56_init_range_decoder(&s->coeff_partition[0], buf, buf_size);
+
+    if (!s->macroblocks_base || /* first frame */
+        width != s->avctx->width || height != s->avctx->height || (width+15)/16 != s->mb_width || (height+15)/16 != s->mb_height) {
+        if ((ret = update_dimensions(s, width, height)) < 0)
+            return ret;
+    }
+
+    /* C. Dequantization indices */
+    vp7_get_quants(s);
+
+    /* D. Golden frame update flag (a Flag) for interframes only */
+    if (!s->keyframe) {
+        s->update_golden = vp8_rac_get(c) ? VP56_FRAME_CURRENT : VP56_FRAME_NONE;
+        s->sign_bias[VP56_FRAME_GOLDEN] = 0;
+    }
+
+    s->update_last = 1;
+    s->update_probabilities = 1;
+    s->fade_present         = 1;
+
+    if (s->profile > 0) {
+        s->update_probabilities = vp8_rac_get(c);
+        if (!s->update_probabilities)
+            s->prob[1] = s->prob[0];
+
+        if (!s->keyframe)
+            s->fade_present = vp8_rac_get(c);
+    }
+
+    /* E. Fading information for previous frame */
+    if (s->fade_present && vp8_rac_get(c)) {
+        int alpha = (int8_t)vp8_rac_get_uint(c, 8);
+        int beta  = (int8_t)vp8_rac_get_uint(c, 8);
+        if (!s->keyframe && (alpha || beta)) {
+            /* preserve the golden frame */
+            if (s->framep[VP56_FRAME_GOLDEN] == s->framep[VP56_FRAME_PREVIOUS]) {
+                AVFrame *gold = s->framep[VP56_FRAME_GOLDEN]->tf.f;
+                AVFrame *prev;
+                int i, j;
+
+                s->framep[VP56_FRAME_PREVIOUS] = vp8_find_free_buffer(s);
+                if ((ret = vp8_alloc_frame(s, s->framep[VP56_FRAME_PREVIOUS], 1)) < 0)
+                   return ret;
+                prev = s->framep[VP56_FRAME_PREVIOUS]->tf.f;
+
+                fade(prev->data[0], prev->linesize[0], gold->data[0], gold->linesize[0], s->mb_width * 16, s->mb_height * 16, alpha, beta);
+                for (j = 1; j < 3; j++)
+                    for (i = 0; i < s->mb_height * 8; i++)
+                        memcpy(prev->data[j] + i * prev->linesize[j], gold->data[j] + i * gold->linesize[j], s->mb_width * 8);
+            } else {
+                AVFrame *prev = s->framep[VP56_FRAME_PREVIOUS]->tf.f;
+                fade(prev->data[0], prev->linesize[0], prev->data[0], prev->linesize[0], s->mb_width * 16, s->mb_height * 16, alpha, beta);
+            }
+
+        }
+    }
+
+    /* F. Loop filter type */
+    if (!s->profile)
+        s->filter.simple = vp8_rac_get(c);
+
+    /* G. DCT coefficient ordering specification */
+    if (vp8_rac_get(c))
+        for (i = 1; i < 16; i++)
+            s->prob[0].scan[i] = zigzag_scan[vp8_rac_get_uint(c, 4)];
+
+    /* H. Loop filter levels  */
+    if (s->profile > 0)
+        s->filter.simple = vp8_rac_get(c);
+    s->filter.level     = vp8_rac_get_uint(c, 6);
+    s->filter.sharpness = vp8_rac_get_uint(c, 3);
+
+    /* I. DCT coefficient probability update; 13.3 Token Probability Updates */
+    vp78_update_probability_tables(s);
+
+    s->mbskip_enabled = 0;
+
+    /* J. The remaining frame header data occurs ONLY FOR INTERFRAMES */
+    if (!s->keyframe) {
+        s->prob->intra  = vp8_rac_get_uint(c, 8);
+        s->prob->last   = vp8_rac_get_uint(c, 8);
+        vp78_update_pred16x16_pred8x8_mvc_probabilities(s);
+    }
+
+    return 0;
+}
+#endif
 
-static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
+#if CONFIG_VP8_DECODER
+static int vp8_decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
 {
     VP56RangeCoder *c = &s->c;
-    int header_size, hscale, vscale, i, j, k, l, m, ret;
+    int header_size, hscale, vscale, ret;
     int width  = s->avctx->width;
     int height = s->avctx->height;
 
@@ -366,10 +619,7 @@ static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
             avpriv_request_sample(s->avctx, "Upscaling");
 
         s->update_golden = s->update_altref = VP56_FRAME_CURRENT;
-        for (i = 0; i < 4; i++)
-            for (j = 0; j < 16; j++)
-                memcpy(s->prob->token[i][j], vp8_token_default_probs[i][vp8_coeff_band[j]],
-                       sizeof(s->prob->token[i][j]));
+        vp78_reset_probability_tables(s);
         memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter, sizeof(s->prob->pred16x16));
         memcpy(s->prob->pred8x8c , vp8_pred8x8c_prob_inter , sizeof(s->prob->pred8x8c));
         memcpy(s->prob->mvc      , vp8_mv_default_prob     , sizeof(s->prob->mvc));
@@ -411,7 +661,7 @@ static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
             return ret;
     }
 
-    get_quants(s);
+    vp8_get_quants(s);
 
     if (!s->keyframe) {
         update_refs(s);
@@ -426,15 +676,7 @@ static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
 
     s->update_last = s->keyframe || vp8_rac_get(c);
 
-    for (i = 0; i < 4; i++)
-        for (j = 0; j < 8; j++)
-            for (k = 0; k < 3; k++)
-                for (l = 0; l < NUM_DCT_TOKENS-1; l++)
-                    if (vp56_rac_get_prob_branchy(c, vp8_token_update_probs[i][j][k][l])) {
-                        int prob = vp8_rac_get_uint(c, 8);
-                        for (m = 0; vp8_coeff_band_indexes[j][m] >= 0; m++)
-                            s->prob->token[i][vp8_coeff_band_indexes[j][m]][k][l] = prob;
-                    }
+    vp78_update_probability_tables(s);
 
     if ((s->mbskip_enabled = vp8_rac_get(c)))
         s->prob->mbskip = vp8_rac_get_uint(c, 8);
@@ -443,23 +685,12 @@ static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
         s->prob->intra  = vp8_rac_get_uint(c, 8);
         s->prob->last   = vp8_rac_get_uint(c, 8);
         s->prob->golden = vp8_rac_get_uint(c, 8);
-
-        if (vp8_rac_get(c))
-            for (i = 0; i < 4; i++)
-                s->prob->pred16x16[i] = vp8_rac_get_uint(c, 8);
-        if (vp8_rac_get(c))
-            for (i = 0; i < 3; i++)
-                s->prob->pred8x8c[i]  = vp8_rac_get_uint(c, 8);
-
-        // 17.2 MV probability update
-        for (i = 0; i < 2; i++)
-            for (j = 0; j < 19; j++)
-                if (vp56_rac_get_prob_branchy(c, vp8_mv_update_prob[i][j]))
-                    s->prob->mvc[i][j] = vp8_rac_get_nn(c);
+        vp78_update_pred16x16_pred8x8_mvc_probabilities(s);
     }
 
     return 0;
 }
+#endif
 
 static av_always_inline void clamp_mv(VP8Context *s, VP56mv *dst, const VP56mv *src)
 {
@@ -470,7 +701,7 @@ static av_always_inline void clamp_mv(VP8Context *s, VP56mv *dst, const VP56mv *
 /**
  * Motion vector coding, 17.1.
  */
-static int read_mv_component(VP56RangeCoder *c, const uint8_t *p)
+static av_always_inline int read_mv_component(VP56RangeCoder *c, const uint8_t *p, int vp7)
 {
     int bit, x = 0;
 
@@ -479,9 +710,9 @@ static int read_mv_component(VP56RangeCoder *c, const uint8_t *p)
 
         for (i = 0; i < 3; i++)
             x += vp56_rac_get_prob(c, p[9 + i]) << i;
-        for (i = 9; i > 3; i--)
+        for (i = (vp7 ? 7 : 9); i > 3; i--)
             x += vp56_rac_get_prob(c, p[9 + i]) << i;
-        if (!(x & 0xFFF0) || vp56_rac_get_prob(c, p[12]))
+        if (!(x & (vp7 ? 0xF0 : 0xFFF0)) || vp56_rac_get_prob(c, p[12]))
             x += 8;
     } else {
         // small_mvtree
@@ -498,6 +729,16 @@ static int read_mv_component(VP56RangeCoder *c, const uint8_t *p)
     return (x && vp56_rac_get_prob(c, p[1])) ? -x : x;
 }
 
+static int vp7_read_mv_component(VP56RangeCoder *c, const uint8_t *p)
+{
+    return read_mv_component(c, p, 1);
+}
+
+static int vp8_read_mv_component(VP56RangeCoder *c, const uint8_t *p)
+{
+    return read_mv_component(c, p, 0);
+}
+
 static av_always_inline
 const uint8_t *get_submv_prob(uint32_t left, uint32_t top)
 {
@@ -513,7 +754,7 @@ const uint8_t *get_submv_prob(uint32_t left, uint32_t top)
  * @returns the number of motion vectors parsed (2, 4 or 16)
  */
 static av_always_inline
-int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb, int layout)
+int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb, int layout, int vp7)
 {
     int part_idx;
     int n, num;
@@ -562,13 +803,13 @@ int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb, int lay
         else
             above = AV_RN32A(&cur_mv[mbsplits_cur[k - 4]]);
 
-        submv_prob = get_submv_prob(left, above);
+        submv_prob = vp7 ? vp7_submv_prob : get_submv_prob(left, above);
 
         if (vp56_rac_get_prob_branchy(c, submv_prob[0])) {
             if (vp56_rac_get_prob_branchy(c, submv_prob[1])) {
                 if (vp56_rac_get_prob_branchy(c, submv_prob[2])) {
-                    mb->bmv[n].y = mb->mv.y + read_mv_component(c, s->prob->mvc[0]);
-                    mb->bmv[n].x = mb->mv.x + read_mv_component(c, s->prob->mvc[1]);
+                    mb->bmv[n].y = mb->mv.y + VPX(vp7, read_mv_component)(c, s->prob->mvc[0]);
+                    mb->bmv[n].x = mb->mv.x + VPX(vp7, read_mv_component)(c, s->prob->mvc[1]);
                 } else {
                     AV_ZERO32(&mb->bmv[n]);
                 }
@@ -583,8 +824,120 @@ int decode_splitmvs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb, int lay
     return num;
 }
 
+/**
+ * the vp7 reference decoder uses a padding macroblock column (added to right
+ * edge of the frame) to guard against illegal macroblock offsets. The algorithm
+ * has bugs that permit offsets to straddle the padding column. This function
+ * replicates those bugs.
+ * @param[out] edge_x macroblock x address
+ * @param[out] edge_y macroblock y address
+ * @return macroblock offset legal (boolean)
+ */
+static int vp7_calculate_mb_offset(int mb_x, int mb_y, int mb_width, int xoffset, int yoffset, int boundary, int *edge_x, int *edge_y)
+{
+    int vwidth = mb_width + 1;
+    int new = (mb_y + yoffset) * vwidth + mb_x + xoffset;
+    if (new < boundary || new % vwidth == vwidth - 1)
+        return 0;
+    *edge_y = new / vwidth;
+    *edge_x = new % vwidth;
+    return 1;
+}
+
+static const VP56mv * get_bmv_ptr(const VP8Macroblock *mb, int subblock)
+{
+    return &mb->bmv[mb->mode == VP8_MVMODE_SPLIT ? vp8_mbsplits[mb->partitioning][subblock] : 0];
+}
+
 static av_always_inline
-void decode_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int layout)
+void vp7_decode_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int layout)
+{
+    VP8Macroblock *mb_edge[12];
+    enum { CNT_ZERO, CNT_NEAREST, CNT_NEAR };
+    enum { VP8_EDGE_TOP, VP8_EDGE_LEFT, VP8_EDGE_TOPLEFT };
+    int idx = CNT_ZERO;
+    VP56mv near_mv[3];
+    uint8_t cnt[3] = { 0 };
+    VP56RangeCoder *c = &s->c;
+    int i;
+
+    AV_ZERO32(&near_mv[0]);
+    AV_ZERO32(&near_mv[1]);
+    AV_ZERO32(&near_mv[2]);
+
+    for (i = 0; i < VP7_MV_PRED_COUNT; i++) {
+        const VP7MVPred * pred = &vp7_mv_pred[i];
+        int edge_x, edge_y;
+
+        if (vp7_calculate_mb_offset(mb_x, mb_y, s->mb_width, pred->xoffset, pred->yoffset, !s->profile, &edge_x, &edge_y)) {
+            VP8Macroblock *edge = mb_edge[i] = (s->mb_layout == 1) ?
+                                                   s->macroblocks_base + (s->mb_width+1)*(edge_y + 1) + 1 + edge_x :
+                                                   s->macroblocks + (s->mb_height - edge_y - 1)*2 + edge_x;
+            uint32_t mv = AV_RN32A(get_bmv_ptr(edge, vp7_mv_pred[i].subblock));
+            if (mv) {
+                if (AV_RN32A(&near_mv[CNT_NEAREST])) {
+                    if (mv == AV_RN32A(&near_mv[CNT_NEAREST])) {
+                        idx = CNT_NEAREST;
+                    } else if (AV_RN32A(&near_mv[CNT_NEAR])) {
+                        if (mv != AV_RN32A(&near_mv[CNT_NEAR]))
+                            continue;
+                        idx = CNT_NEAR;
+                    } else {
+                        AV_WN32A(&near_mv[CNT_NEAR], mv);
+                        idx = CNT_NEAR;
+                    }
+                } else {
+                    AV_WN32A(&near_mv[CNT_NEAREST], mv);
+                    idx = CNT_NEAREST;
+                }
+            } else {
+                idx = CNT_ZERO;
+            }
+        } else {
+            idx = CNT_ZERO;
+        }
+        cnt[idx] += vp7_mv_pred[i].score;
+    }
+
+    mb->partitioning = VP8_SPLITMVMODE_NONE;
+
+    if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_ZERO]][0])) {
+        mb->mode = VP8_MVMODE_MV;
+
+        if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_NEAREST]][1])) {
+
+            if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_NEAR]][2])) {
+
+                if (cnt[CNT_NEAREST] > cnt[CNT_NEAR])
+                    AV_WN32A(&mb->mv, cnt[CNT_ZERO] > cnt[CNT_NEAREST] ? 0 : AV_RN32A(&near_mv[CNT_NEAREST]));
+                else
+                    AV_WN32A(&mb->mv, cnt[CNT_ZERO] > cnt[CNT_NEAR]    ? 0 : AV_RN32A(&near_mv[CNT_NEAR]));
+
+                if (vp56_rac_get_prob_branchy(c, vp7_mode_contexts[cnt[CNT_NEAR]][3])) {
+                    mb->mode = VP8_MVMODE_SPLIT;
+                    mb->mv = mb->bmv[decode_splitmvs(s, c, mb, layout, 1) - 1];
+                } else {
+                    mb->mv.y += vp7_read_mv_component(c, s->prob->mvc[0]);
+                    mb->mv.x += vp7_read_mv_component(c, s->prob->mvc[1]);
+                    mb->bmv[0] = mb->mv;
+                }
+            } else {
+                mb->mv = near_mv[CNT_NEAR];
+                mb->bmv[0] = mb->mv;
+            }
+        } else {
+            mb->mv = near_mv[CNT_NEAREST];
+            mb->bmv[0] = mb->mv;
+        }
+    } else {
+        mb->mode = VP8_MVMODE_ZERO;
+        AV_ZERO32(&mb->mv);
+        mb->bmv[0] = mb->mv;
+    }
+}
+
+static av_always_inline
+void vp8_decode_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int layout)
 {
     VP8Macroblock *mb_edge[3] = { 0 /* top */,
                                   mb - 1 /* left */,
@@ -661,10 +1014,10 @@ void decode_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int layout
 
                 if (vp56_rac_get_prob_branchy(c, vp8_mode_contexts[cnt[CNT_SPLITMV]][3])) {
                     mb->mode = VP8_MVMODE_SPLIT;
-                    mb->mv = mb->bmv[decode_splitmvs(s, c, mb, layout) - 1];
+                    mb->mv = mb->bmv[decode_splitmvs(s, c, mb, layout, 0) - 1];
                 } else {
-                    mb->mv.y += read_mv_component(c, s->prob->mvc[0]);
-                    mb->mv.x += read_mv_component(c, s->prob->mvc[1]);
+                    mb->mv.y += vp8_read_mv_component(c, s->prob->mvc[0]);
+                    mb->mv.x += vp8_read_mv_component(c, s->prob->mvc[1]);
                     mb->bmv[0] = mb->mv;
                 }
             } else {
@@ -716,17 +1069,32 @@ void decode_intra4x4_modes(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,
     }
 }
 
+static const char * vp7_feature_name[] = { "q-index", "lf-delta", "partial-golden-update", "blit-pitch" };
+
 static av_always_inline
 void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
-                    uint8_t *segment, uint8_t *ref, int layout)
+                    uint8_t *segment, uint8_t *ref, int layout, int vp7)
 {
     VP56RangeCoder *c = &s->c;
 
-    if (s->segmentation.update_map) {
-        int bit  = vp56_rac_get_prob(c, s->prob->segmentid[0]);
-        *segment = vp56_rac_get_prob(c, s->prob->segmentid[1+bit]) + 2*bit;
-    } else if (s->segmentation.enabled)
-        *segment = ref ? *ref : *segment;
+    if (vp7) {
+        int i;
+        *segment = 0;
+        for (i = 0; i < 4; i++) {
+            if (s->feature_enabled[i]) {
+                if (vp56_rac_get_prob(c, s->feature_present_prob[i])) {
+                      int index = vp8_rac_get_tree(c, vp7_feature_index_tree, s->feature_index_prob[i]);
+                      av_log(s->avctx, AV_LOG_WARNING, "Feature %s present in macroblock (value 0x%x)\n", vp7_feature_name[i], s->feature_value[i][index]);
+                }
+            }
+        }
+    } else {
+        if (s->segmentation.update_map) {
+            int bit  = vp56_rac_get_prob(c, s->prob->segmentid[0]);
+            *segment = vp56_rac_get_prob(c, s->prob->segmentid[1+bit]) + 2*bit;
+        } else if (s->segmentation.enabled)
+            *segment = ref ? *ref : *segment;
+    }
     mb->segment = *segment;
 
     mb->skip = s->mbskip_enabled ? vp56_rac_get_prob(c, s->prob->mbskip) : 0;
@@ -737,7 +1105,7 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
         if (mb->mode == MODE_I4x4) {
             decode_intra4x4_modes(s, c, mb, mb_x, 1, layout);
         } else {
-            const uint32_t modes = vp8_pred4x4_mode[mb->mode] * 0x01010101u;
+            const uint32_t modes = VPX(vp7, pred4x4_mode)[mb->mode] * 0x01010101u;
             if (s->mb_layout)
                 AV_WN32A(mb->intra4x4_pred_mode_top, modes);
             else
@@ -750,14 +1118,17 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
     } else if (vp56_rac_get_prob_branchy(c, s->prob->intra)) {
         // inter MB, 16.2
         if (vp56_rac_get_prob_branchy(c, s->prob->last))
-            mb->ref_frame = vp56_rac_get_prob(c, s->prob->golden) ?
+            mb->ref_frame = (!vp7 && vp56_rac_get_prob(c, s->prob->golden)) ?
                 VP56_FRAME_GOLDEN2 /* altref */ : VP56_FRAME_GOLDEN;
         else
             mb->ref_frame = VP56_FRAME_PREVIOUS;
         s->ref_count[mb->ref_frame-1]++;
 
         // motion vectors, 16.3
-        decode_mvs(s, mb, mb_x, mb_y, layout);
+        if (vp7)
+            vp7_decode_mvs(s, mb, mb_x, mb_y, layout);
+        else
+            vp8_decode_mvs(s, mb, mb_x, mb_y, layout);
     } else {
         // intra MB, 16.1
         mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_inter, s->prob->pred16x16);
@@ -772,7 +1143,28 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
     }
 }
 
-#ifndef decode_block_coeffs_internal
+static av_always_inline int inter_predict_dc(int16_t block[16], int16_t pred[2])
+{
+    int16_t dc = block[0];
+    int ret = 0;
+
+    if (pred[1] > 3) {
+        dc += pred[0];
+        ret = 1;
+    }
+
+    if (!pred[0] || !dc || FFSIGN(pred[0]) != FFSIGN(dc)) {
+        block[0] = pred[0] = dc;
+        pred[1] = 0;
+    } else {
+        if (pred[0] == dc)
+            pred[1]++;
+        block[0] = pred[0] = dc;
+    }
+
+    return ret;
+}
+
 /**
  * @param r arithmetic bitstream reader context
  * @param block destination for block coefficients
@@ -782,14 +1174,17 @@ void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
  * @return 0 if no coeffs were decoded
  *         otherwise, the index of the last coeff decoded plus one
  */
-static int decode_block_coeffs_internal(VP56RangeCoder *r, int16_t block[16],
+static av_always_inline
+int decode_block_coeffs_internal(VP56RangeCoder *r, int16_t block[16],
                                         uint8_t probs[16][3][NUM_DCT_TOKENS-1],
-                                        int i, uint8_t *token_prob, int16_t qmul[2])
+                                        int i, uint8_t *token_prob, int16_t qmul[2],
+                                        const uint8_t scan[16], int vp7)
 {
     VP56RangeCoder c = *r;
     goto skip_eob;
     do {
         int coeff;
+restart:
         if (!vp56_rac_get_prob_branchy(&c, token_prob[0]))   // DCT_EOB
             break;
 
@@ -798,6 +1193,8 @@ skip_eob:
             if (++i == 16)
                 break; // invalid input; blocks should end with EOB
             token_prob = probs[i][0];
+            if (vp7)
+                goto restart;
             goto skip_eob;
         }
 
@@ -830,12 +1227,28 @@ skip_eob:
             }
             token_prob = probs[i+1][2];
         }
-        block[zigzag_scan[i]] = (vp8_rac_get(&c) ? -coeff : coeff) * qmul[!!i];
+        block[scan[i]] = (vp8_rac_get(&c) ? -coeff : coeff) * qmul[!!i];
     } while (++i < 16);
 
     *r = c;
     return i;
 }
+
+static int vp7_decode_block_coeffs_internal(VP56RangeCoder *r, int16_t block[16],
+                                        uint8_t probs[16][3][NUM_DCT_TOKENS-1],
+                                        int i, uint8_t *token_prob, int16_t qmul[2],
+                                        const uint8_t scan[16])
+{
+    return decode_block_coeffs_internal(r, block, probs, i, token_prob, qmul, scan, 1);
+}
+
+#ifndef vp8_decode_block_coeffs_internal
+static int vp8_decode_block_coeffs_internal(VP56RangeCoder *r, int16_t block[16],
+                                        uint8_t probs[16][3][NUM_DCT_TOKENS-1],
+                                        int i, uint8_t *token_prob, int16_t qmul[2])
+{
+    return decode_block_coeffs_internal(r, block, probs, i, token_prob, qmul, zigzag_scan, 0);
+}
 #endif
 
 /**
@@ -846,36 +1259,43 @@ skip_eob:
  * @param zero_nhood the initial prediction context for number of surrounding
  *                   all-zero blocks (only left/top, so 0-2)
  * @param qmul array holding the dc/ac dequant factor at position 0/1
+ * @param scan scan pattern (VP7 only)
  * @return 0 if no coeffs were decoded
  *         otherwise, the index of the last coeff decoded plus one
  */
 static av_always_inline
 int decode_block_coeffs(VP56RangeCoder *c, int16_t block[16],
                         uint8_t probs[16][3][NUM_DCT_TOKENS-1],
-                        int i, int zero_nhood, int16_t qmul[2])
+                        int i, int zero_nhood, int16_t qmul[2],
+                        const uint8_t scan[16], int vp7)
 {
     uint8_t *token_prob = probs[i][zero_nhood];
     if (!vp56_rac_get_prob_branchy(c, token_prob[0]))   // DCT_EOB
         return 0;
-    return decode_block_coeffs_internal(c, block, probs, i, token_prob, qmul);
+    return vp7 ? vp7_decode_block_coeffs_internal(c, block, probs, i, token_prob, qmul, scan)
+               : vp8_decode_block_coeffs_internal(c, block, probs, i, token_prob, qmul);
 }
 
 static av_always_inline
 void decode_mb_coeffs(VP8Context *s, VP8ThreadData *td, VP56RangeCoder *c, VP8Macroblock *mb,
-                      uint8_t t_nnz[9], uint8_t l_nnz[9])
+                      uint8_t t_nnz[9], uint8_t l_nnz[9], int vp7)
 {
     int i, x, y, luma_start = 0, luma_ctx = 3;
     int nnz_pred, nnz, nnz_total = 0;
     int segment = mb->segment;
     int block_dc = 0;
 
-    if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {
+    if (mb->mode != MODE_I4x4 && (vp7 || mb->mode != VP8_MVMODE_SPLIT)) {
         nnz_pred = t_nnz[8] + l_nnz[8];
 
         // decode DC values and do hadamard
         nnz = decode_block_coeffs(c, td->block_dc, s->prob->token[1], 0, nnz_pred,
-                                  s->qmat[segment].luma_dc_qmul);
+                                  s->qmat[segment].luma_dc_qmul, zigzag_scan, vp7);
         l_nnz[8] = t_nnz[8] = !!nnz;
+
+        if (vp7 && mb->mode > MODE_I4x4)
+            nnz |= inter_predict_dc(td->block_dc, s->inter_dc_pred[mb->ref_frame - 1]);
+
         if (nnz) {
             nnz_total += nnz;
             block_dc = 1;
@@ -893,7 +1313,7 @@ void decode_mb_coeffs(VP8Context *s, VP8ThreadData *td, VP56RangeCoder *c, VP8Ma
         for (x = 0; x < 4; x++) {
             nnz_pred = l_nnz[y] + t_nnz[x];
             nnz = decode_block_coeffs(c, td->block[y][x], s->prob->token[luma_ctx], luma_start,
-                                      nnz_pred, s->qmat[segment].luma_qmul);
+                                      nnz_pred, s->qmat[segment].luma_qmul, s->prob[0].scan, vp7);
             // nnz+block_dc may be one more than the actual last index, but we don't care
             td->non_zero_count_cache[y][x] = nnz + block_dc;
             t_nnz[x] = l_nnz[y] = !!nnz;
@@ -908,7 +1328,7 @@ void decode_mb_coeffs(VP8Context *s, VP8ThreadData *td, VP56RangeCoder *c, VP8Ma
             for (x = 0; x < 2; x++) {
                 nnz_pred = l_nnz[i+2*y] + t_nnz[i+2*x];
                 nnz = decode_block_coeffs(c, td->block[i][(y<<1)+x], s->prob->token[2], 0,
-                                          nnz_pred, s->qmat[segment].chroma_qmul);
+                                          nnz_pred, s->qmat[segment].chroma_qmul, s->prob[0].scan, vp7);
                 td->non_zero_count_cache[i][(y<<1)+x] = nnz;
                 t_nnz[i+2*x] = l_nnz[i+2*y] = !!nnz;
                 nnz_total += nnz;
@@ -974,43 +1394,43 @@ int check_dc_pred8x8_mode(int mode, int mb_x, int mb_y)
 }
 
 static av_always_inline
-int check_tm_pred8x8_mode(int mode, int mb_x, int mb_y)
+int check_tm_pred8x8_mode(int mode, int mb_x, int mb_y, int vp7)
 {
     if (!mb_x) {
-        return mb_y ? VERT_PRED8x8 : DC_129_PRED8x8;
+        return mb_y ? VERT_PRED8x8 : (vp7 ? DC_128_PRED8x8 : DC_129_PRED8x8);
     } else {
         return mb_y ? mode : HOR_PRED8x8;
     }
 }
 
 static av_always_inline
-int check_intra_pred8x8_mode_emuedge(int mode, int mb_x, int mb_y)
+int check_intra_pred8x8_mode_emuedge(int mode, int mb_x, int mb_y, int vp7)
 {
     switch (mode) {
     case DC_PRED8x8:
         return check_dc_pred8x8_mode(mode, mb_x, mb_y);
     case VERT_PRED8x8:
-        return !mb_y ? DC_127_PRED8x8 : mode;
+        return !mb_y ? (vp7 ? DC_128_PRED8x8 : DC_127_PRED8x8) : mode;
     case HOR_PRED8x8:
-        return !mb_x ? DC_129_PRED8x8 : mode;
+        return !mb_x ? (vp7 ? DC_128_PRED8x8 : DC_129_PRED8x8) : mode;
     case PLANE_PRED8x8 /*TM*/:
-        return check_tm_pred8x8_mode(mode, mb_x, mb_y);
+        return check_tm_pred8x8_mode(mode, mb_x, mb_y, vp7);
     }
     return mode;
 }
 
 static av_always_inline
-int check_tm_pred4x4_mode(int mode, int mb_x, int mb_y)
+int check_tm_pred4x4_mode(int mode, int mb_x, int mb_y, int vp7)
 {
     if (!mb_x) {
-        return mb_y ? VERT_VP8_PRED : DC_129_PRED;
+        return mb_y ? VERT_VP8_PRED : (vp7 ? DC_128_PRED : DC_129_PRED);
     } else {
         return mb_y ? mode : HOR_VP8_PRED;
     }
 }
 
 static av_always_inline
-int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y, int *copy_buf)
+int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y, int *copy_buf, int vp7)
 {
     switch (mode) {
     case VERT_PRED:
@@ -1021,7 +1441,7 @@ int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y, int *copy_buf
         /* fall-through */
     case DIAG_DOWN_LEFT_PRED:
     case VERT_LEFT_PRED:
-        return !mb_y ? DC_127_PRED : mode;
+        return !mb_y ? (vp7 ? DC_128_PRED : DC_127_PRED) : mode;
     case HOR_PRED:
         if (!mb_y) {
             *copy_buf = 1;
@@ -1029,9 +1449,9 @@ int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y, int *copy_buf
         }
         /* fall-through */
     case HOR_UP_PRED:
-        return !mb_x ? DC_129_PRED : mode;
+        return !mb_x ? (vp7 ? DC_128_PRED : DC_129_PRED) : mode;
     case TM_VP8_PRED:
-        return check_tm_pred4x4_mode(mode, mb_x, mb_y);
+        return check_tm_pred4x4_mode(mode, mb_x, mb_y, vp7);
     case DC_PRED: // 4x4 DC doesn't use the same "H.264-style" exceptions as 16x16/8x8 DC
     case DIAG_DOWN_RIGHT_PRED:
     case VERT_RIGHT_PRED:
@@ -1045,7 +1465,7 @@ int check_intra_pred4x4_mode_emuedge(int mode, int mb_x, int mb_y, int *copy_buf
 
 static av_always_inline
 void intra_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
-                   VP8Macroblock *mb, int mb_x, int mb_y)
+                   VP8Macroblock *mb, int mb_x, int mb_y, int vp7)
 {
     int x, y, mode, nnz;
     uint32_t tr;
@@ -1058,12 +1478,14 @@ void intra_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                        s->filter.simple, 1);
 
     if (mb->mode < MODE_I4x4) {
-        mode = check_intra_pred8x8_mode_emuedge(mb->mode, mb_x, mb_y);
+        mode = check_intra_pred8x8_mode_emuedge(mb->mode, mb_x, mb_y, vp7);
         s->hpc.pred16x16[mode](dst[0], s->linesize);
     } else {
         uint8_t *ptr = dst[0];
         uint8_t *intra4x4 = mb->intra4x4_pred_mode_mb;
-        uint8_t tr_top[4] = { 127, 127, 127, 127 };
+        const uint8_t lo = vp7 ? 128 : 127;
+        const uint8_t hi = vp7 ? 128 : 129;
+        uint8_t tr_top[4] = { lo, lo, lo, lo };
 
         // all blocks on the right edge of the macroblock use bottom edge
         // the top macroblock for their topright edge
@@ -1092,17 +1514,17 @@ void intra_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                 } else if (x == 3)
                     topright = tr_right;
 
-                mode = check_intra_pred4x4_mode_emuedge(intra4x4[x], mb_x + x, mb_y + y, &copy);
+                mode = check_intra_pred4x4_mode_emuedge(intra4x4[x], mb_x + x, mb_y + y, &copy, vp7);
                 if (copy) {
                     dst = copy_dst + 12;
                     linesize = 8;
                     if (!(mb_y + y)) {
-                        copy_dst[3] = 127U;
-                        AV_WN32A(copy_dst+4, 127U * 0x01010101U);
+                        copy_dst[3] = lo;
+                        AV_WN32A(copy_dst+4, lo * 0x01010101U);
                     } else {
                         AV_COPY32(copy_dst+4, ptr+4*x-s->linesize);
                         if (!(mb_x + x)) {
-                            copy_dst[3] = 129U;
+                            copy_dst[3] = hi;
                         } else {
                             copy_dst[3] = ptr[4*x-s->linesize-1];
                         }
@@ -1111,7 +1533,7 @@ void intra_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                         copy_dst[11] =
                         copy_dst[19] =
                         copy_dst[27] =
-                        copy_dst[35] = 129U;
+                        copy_dst[35] = hi;
                     } else {
                         copy_dst[11] = ptr[4*x              -1];
                         copy_dst[19] = ptr[4*x+s->linesize  -1];
@@ -1142,7 +1564,7 @@ void intra_predict(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
         }
     }
 
-    mode = check_intra_pred8x8_mode_emuedge(mb->chroma_pred_mode, mb_x, mb_y);
+    mode = check_intra_pred8x8_mode_emuedge(mb->chroma_pred_mode, mb_x, mb_y, vp7);
     s->hpc.pred8x8[mode](dst[1], s->uvlinesize);
     s->hpc.pred8x8[mode](dst[2], s->uvlinesize);
 
@@ -1296,7 +1718,7 @@ void vp8_mc_part(VP8Context *s, VP8ThreadData *td, uint8_t *dst[3],
                 s->put_pixels_tab[block_w == 8]);
 
     /* U/V */
-    if (s->profile == 3) {
+    if (s->profile == 3) { /* this block only applies VP8; it is safe to check only the profile, as VP7 profile <= 1 */
         uvmv.x &= ~7;
         uvmv.y &= ~7;
     }
@@ -1468,7 +1890,7 @@ chroma_idct_end: ;
     }
 }
 
-static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb, VP8FilterStrength *f )
+static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb, VP8FilterStrength *f, int vp7)
 {
     int interior_limit, filter_level;
 
@@ -1495,12 +1917,12 @@ static av_always_inline void filter_level_for_mb(VP8Context *s, VP8Macroblock *m
 
     f->filter_level = filter_level;
     f->inner_limit = interior_limit;
-    f->inner_filter = !mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT;
+    f->inner_filter = vp7 || !mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT;
 }
 
-static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f, int mb_x, int mb_y)
+static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f, int mb_x, int mb_y, int vp7)
 {
-    int mbedge_lim, bedge_lim, hev_thresh;
+    int mbedge_lim, bedge_lim_y, bedge_lim_uv, hev_thresh;
     int filter_level = f->filter_level;
     int inner_limit = f->inner_limit;
     int inner_filter = f->inner_filter;
@@ -1520,8 +1942,15 @@ static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8Filter
     if (!filter_level)
         return;
 
-     bedge_lim = 2*filter_level + inner_limit;
-    mbedge_lim = bedge_lim + 4;
+    if (vp7) {
+        bedge_lim_y  =   filter_level;
+        bedge_lim_uv = 2*filter_level;
+        mbedge_lim   =   filter_level + 2;
+    } else {
+        bedge_lim_y  =
+        bedge_lim_uv = 2*filter_level + inner_limit;
+        mbedge_lim   =   bedge_lim_y + 4;
+    }
 
     hev_thresh = hev_thresh_lut[s->keyframe][filter_level];
 
@@ -1532,18 +1961,21 @@ static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8Filter
                                        mbedge_lim, inner_limit, hev_thresh);
     }
 
-    if (inner_filter) {
-        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 4, linesize, bedge_lim,
-                                             inner_limit, hev_thresh);
-        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 8, linesize, bedge_lim,
-                                             inner_limit, hev_thresh);
-        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+12, linesize, bedge_lim,
-                                             inner_limit, hev_thresh);
-        s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] + 4, dst[2] + 4,
-                                             uvlinesize,  bedge_lim,
-                                             inner_limit, hev_thresh);
+#define H_LOOP_FILTER_16Y_INNER(cond) \
+    if (cond && inner_filter) {\
+        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 4, linesize, bedge_lim_y,\
+                                             inner_limit, hev_thresh);\
+        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 8, linesize, bedge_lim_y,\
+                                             inner_limit, hev_thresh);\
+        s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+12, linesize, bedge_lim_y,\
+                                             inner_limit, hev_thresh);\
+        s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] + 4, dst[2] + 4,\
+                                             uvlinesize,  bedge_lim_uv,\
+                                             inner_limit, hev_thresh);\
     }
 
+    H_LOOP_FILTER_16Y_INNER(!vp7)
+
     if (mb_y) {
         s->vp8dsp.vp8_v_loop_filter16y(dst[0],     linesize,
                                        mbedge_lim, inner_limit, hev_thresh);
@@ -1553,19 +1985,21 @@ static av_always_inline void filter_mb(VP8Context *s, uint8_t *dst[3], VP8Filter
 
     if (inner_filter) {
         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 4*linesize,
-                                             linesize,    bedge_lim,
+                                             linesize,    bedge_lim_y,
                                              inner_limit, hev_thresh);
         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 8*linesize,
-                                             linesize,    bedge_lim,
+                                             linesize,    bedge_lim_y,
                                              inner_limit, hev_thresh);
         s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+12*linesize,
-                                             linesize,    bedge_lim,
+                                             linesize,    bedge_lim_y,
                                              inner_limit, hev_thresh);
         s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] + 4 * uvlinesize,
                                              dst[2] + 4 * uvlinesize,
-                                             uvlinesize,  bedge_lim,
+                                             uvlinesize,  bedge_lim_uv,
                                              inner_limit, hev_thresh);
     }
+
+    H_LOOP_FILTER_16Y_INNER(vp7)
 }
 
 static av_always_inline void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f, int mb_x, int mb_y)
@@ -1600,8 +2034,9 @@ static av_always_inline void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8Fi
 }
 
 #define MARGIN (16 << 2)
-static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
-                                   VP8Frame *prev_frame)
+static av_always_inline
+void decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
+                                   VP8Frame *prev_frame, int vp7)
 {
     VP8Context *s = avctx->priv_data;
     int mb_x, mb_y;
@@ -1621,7 +2056,7 @@ static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
                 AV_WN32A((mb-s->mb_width-1)->intra4x4_pred_mode_top, DC_PRED*0x01010101);
             decode_mb_mode(s, mb, mb_x, mb_y, curframe->seg_map->data + mb_xy,
                            prev_frame && prev_frame->seg_map ?
-                           prev_frame->seg_map->data + mb_xy : NULL, 1);
+                           prev_frame->seg_map->data + mb_xy : NULL, 1, vp7);
             s->mv_min.x -= 64;
             s->mv_max.x -= 64;
         }
@@ -1630,6 +2065,22 @@ static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
     }
 }
 
+#if CONFIG_VP7_DECODER
+static void vp7_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
+                                   VP8Frame *prev_frame)
+{
+    decode_mv_mb_modes(avctx, curframe, prev_frame, 1);
+}
+#endif
+
+#if CONFIG_VP8_DECODER
+static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
+                                   VP8Frame *prev_frame)
+{
+    decode_mv_mb_modes(avctx, curframe, prev_frame, 0);
+}
+#endif
+
 #if HAVE_THREADS
 #define check_thread_pos(td, otd, mb_x_check, mb_y_check)\
     do {\
@@ -1667,8 +2118,8 @@ static void vp8_decode_mv_mb_modes(AVCodecContext *avctx, VP8Frame *curframe,
 #define update_pos(td, mb_y, mb_x)
 #endif
 
-static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
-                                        int jobnr, int threadnr)
+static av_always_inline void decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
+                                        int jobnr, int threadnr, int vp7)
 {
     VP8Context *s = avctx->priv_data;
     VP8ThreadData *prev_td, *next_td, *td = &s->thread_data[threadnr];
@@ -1700,7 +2151,8 @@ static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
         AV_WN32A(s->intra4x4_pred_mode_left, DC_PRED*0x01010101);
     }
 
-    memset(td->left_nnz, 0, sizeof(td->left_nnz));
+    if (!vp7 || mb_y == 0)
+        memset(td->left_nnz, 0, sizeof(td->left_nnz));
 
     s->mv_min.x = -MARGIN;
     s->mv_max.x = ((s->mb_width  - 1) << 6) + MARGIN;
@@ -1709,9 +2161,9 @@ static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
         // Wait for previous thread to read mb_x+2, and reach mb_y-1.
         if (prev_td != td) {
             if (threadnr != 0) {
-                check_thread_pos(td, prev_td, mb_x+1, mb_y-1);
+                check_thread_pos(td, prev_td, mb_x+(vp7?2:1), mb_y-(vp7?2:1));
             } else {
-                check_thread_pos(td, prev_td, (s->mb_width+3) + (mb_x+1), mb_y-1);
+                check_thread_pos(td, prev_td, (s->mb_width+3) + (mb_x+(vp7?2:1)), mb_y-(vp7?2:1));
             }
         }
 
@@ -1721,15 +2173,15 @@ static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
         if (!s->mb_layout)
             decode_mb_mode(s, mb, mb_x, mb_y, curframe->seg_map->data + mb_xy,
                            prev_frame && prev_frame->seg_map ?
-                           prev_frame->seg_map->data + mb_xy : NULL, 0);
+                           prev_frame->seg_map->data + mb_xy : NULL, 0, vp7);
 
         prefetch_motion(s, mb, mb_x, mb_y, mb_xy, VP56_FRAME_PREVIOUS);
 
         if (!mb->skip)
-            decode_mb_coeffs(s, td, c, mb, s->top_nnz[mb_x], td->left_nnz);
+            decode_mb_coeffs(s, td, c, mb, s->top_nnz[mb_x], td->left_nnz, vp7);
 
         if (mb->mode <= MODE_I4x4)
-            intra_predict(s, td, dst, mb, mb_x, mb_y);
+            intra_predict(s, td, dst, mb, mb_x, mb_y, vp7);
         else
             inter_predict(s, td, dst, mb, mb_x, mb_y);
 
@@ -1749,7 +2201,7 @@ static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
         }
 
         if (s->deblock_filter)
-            filter_level_for_mb(s, mb, &td->filter_strength[mb_x]);
+            filter_level_for_mb(s, mb, &td->filter_strength[mb_x], vp7);
 
         if (s->deblock_filter && num_jobs != 1 && threadnr == num_jobs-1) {
             if (s->filter.simple)
@@ -1774,8 +2226,24 @@ static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
     }
 }
 
-static void vp8_filter_mb_row(AVCodecContext *avctx, void *tdata,
-                              int jobnr, int threadnr)
+#if CONFIG_VP7_DECODER
+static void vp7_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
+                                        int jobnr, int threadnr)
+{
+    decode_mb_row_no_filter(avctx, tdata, jobnr, threadnr, 1);
+}
+#endif
+
+#if CONFIG_VP8_DECODER
+static void vp8_decode_mb_row_no_filter(AVCodecContext *avctx, void *tdata,
+                                        int jobnr, int threadnr)
+{
+    decode_mb_row_no_filter(avctx, tdata, jobnr, threadnr, 0);
+}
+#endif
+
+static av_always_inline void filter_mb_row(AVCodecContext *avctx, void *tdata,
+                              int jobnr, int threadnr, int vp7)
 {
     VP8Context *s = avctx->priv_data;
     VP8ThreadData *td = &s->thread_data[threadnr];
@@ -1819,7 +2287,7 @@ static void vp8_filter_mb_row(AVCodecContext *avctx, void *tdata,
         if (s->filter.simple)
             filter_mb_simple(s, dst[0], f, mb_x, mb_y);
         else
-            filter_mb(s, dst, f, mb_x, mb_y);
+            filter_mb(s, dst, f, mb_x, mb_y, vp7);
         dst[0] += 16;
         dst[1] += 8;
         dst[2] += 8;
@@ -1828,6 +2296,22 @@ static void vp8_filter_mb_row(AVCodecContext *avctx, void *tdata,
     }
 }
 
+#if CONFIG_VP7_DECODER
+static void vp7_filter_mb_row(AVCodecContext *avctx, void *tdata,
+                              int jobnr, int threadnr)
+{
+    filter_mb_row(avctx, tdata, jobnr, threadnr, 1);
+}
+#endif
+
+#if CONFIG_VP8_DECODER
+static void vp8_filter_mb_row(AVCodecContext *avctx, void *tdata,
+                              int jobnr, int threadnr)
+{
+    filter_mb_row(avctx, tdata, jobnr, threadnr, 0);
+}
+#endif
+
 static int vp8_decode_mb_row_sliced(AVCodecContext *avctx, void *tdata,
                                     int jobnr, int threadnr)
 {
@@ -1840,9 +2324,9 @@ static int vp8_decode_mb_row_sliced(AVCodecContext *avctx, void *tdata,
     for (mb_y = jobnr; mb_y < s->mb_height; mb_y += num_jobs) {
         if (mb_y >= s->mb_height) break;
         td->thread_mb_pos = mb_y<<16;
-        vp8_decode_mb_row_no_filter(avctx, tdata, jobnr, threadnr);
+        s->decode_mb_row_no_filter(avctx, tdata, jobnr, threadnr);
         if (s->deblock_filter)
-            vp8_filter_mb_row(avctx, tdata, jobnr, threadnr);
+            s->filter_mb_row(avctx, tdata, jobnr, threadnr);
         update_pos(td, mb_y, INT_MAX & 0xFFFF);
 
         s->mv_min.y -= 64;
@@ -1863,7 +2347,7 @@ int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     enum AVDiscard skip_thresh;
     VP8Frame *av_uninit(curframe), *prev_frame;
 
-    if ((ret = decode_frame_header(s, avpkt->data, avpkt->size)) < 0)
+    if ((ret = VPX(s->vp7, decode_frame_header)(s, avpkt->data, avpkt->size)) < 0)
         goto err;
 
     prev_frame = s->framep[VP56_FRAME_CURRENT];
@@ -1947,7 +2431,7 @@ int ff_vp8_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
         if (prev_frame && s->segmentation.enabled &&
             !s->segmentation.update_map)
             ff_thread_await_progress(&prev_frame->tf, 1, 0);
-        vp8_decode_mv_mb_modes(avctx, curframe, prev_frame);
+        VPX(s->vp7, decode_mv_mb_modes)(avctx, curframe, prev_frame);
     }
 
     if (avctx->active_thread_type == FF_THREAD_FRAME)
@@ -2015,12 +2499,16 @@ av_cold int ff_vp8_decode_init(AVCodecContext *avctx)
     int ret;
 
     s->avctx = avctx;
+    s->vp7   = avctx->codec->id == AV_CODEC_ID_VP7;
     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
     avctx->internal->allocate_progress = 1;
 
     ff_videodsp_init(&s->vdsp, 8);
-    ff_h264_pred_init(&s->hpc, AV_CODEC_ID_VP8, 8, 1);
-    ff_vp8dsp_init(&s->vp8dsp, 0);
+    ff_h264_pred_init(&s->hpc, s->vp7 ? AV_CODEC_ID_VP7 : AV_CODEC_ID_VP8, 8, 1);
+    ff_vp8dsp_init(&s->vp8dsp, s->vp7);
+
+    s->decode_mb_row_no_filter = VPX(s->vp7, decode_mb_row_no_filter);
+    s->filter_mb_row           = VPX(s->vp7, filter_mb_row);
 
     if ((ret = vp8_init_frames(s)) < 0) {
         ff_vp8_decode_free(avctx);
@@ -2030,6 +2518,7 @@ av_cold int ff_vp8_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
+#if CONFIG_VP8_DECODER
 static av_cold int vp8_decode_init_thread_copy(AVCodecContext *avctx)
 {
     VP8Context *s = avctx->priv_data;
@@ -2080,7 +2569,24 @@ static int vp8_decode_update_thread_context(AVCodecContext *dst, const AVCodecCo
 
     return 0;
 }
+#endif
 
+#if CONFIG_VP7_DECODER
+AVCodec ff_vp7_decoder = {
+    .name                  = "vp7",
+    .long_name             = NULL_IF_CONFIG_SMALL("On2 VP7"),
+    .type                  = AVMEDIA_TYPE_VIDEO,
+    .id                    = AV_CODEC_ID_VP7,
+    .priv_data_size        = sizeof(VP8Context),
+    .init                  = ff_vp8_decode_init,
+    .close                 = ff_vp8_decode_free,
+    .decode                = ff_vp8_decode_frame,
+    .capabilities          = CODEC_CAP_DR1,
+    .flush                 = vp8_decode_flush,
+};
+#endif
+
+#if CONFIG_VP8_DECODER
 AVCodec ff_vp8_decoder = {
     .name                  = "vp8",
     .long_name             = NULL_IF_CONFIG_SMALL("On2 VP8"),
@@ -2095,4 +2601,5 @@ AVCodec ff_vp8_decoder = {
     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(vp8_decode_init_thread_copy),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(vp8_decode_update_thread_context),
 };
+#endif