diff --git a/inc/rk_mpi.h b/inc/rk_mpi.h
index 51cfcc47..376f261c 100644
--- a/inc/rk_mpi.h
+++ b/inc/rk_mpi.h
@@ -78,6 +78,7 @@ typedef enum {
     MPP_DEC_USE_PRESENT_TIME_ORDER,
     MPP_DEC_SET_VC1_EXTRA_DATA,
     MPP_DEC_SET_VP6_ID,
+    MPP_DEC_USE_FAST_MODE,
 
     MPP_ENC_CMD_BASE                    = 0x50000,
     MPP_ENC_SETCFG,
@@ -169,7 +170,8 @@ extern "C" {
 /*
  * mpp interface
  */
-MPP_RET mpp_init(MppCtx *ctx, MppApi **mpi, MppCtxType type, MppCodingType coding);
+MPP_RET mpp_construct(MppCtx *ctx, MppApi **mpi);
+MPP_RET mpp_init(MppCtx ctx, MppCtxType type, MppCodingType coding);
 MPP_RET mpp_deinit(MppCtx ctx);
 
 #ifdef __cplusplus
diff --git a/inc/vpu_api.h b/inc/vpu_api.h
index 7d4a688e..8905038b 100644
--- a/inc/vpu_api.h
+++ b/inc/vpu_api.h
@@ -54,6 +54,7 @@ typedef enum VPU_API_CMD {
     VPU_API_USE_PRESENT_TIME_ORDER,
     VPU_API_SET_DEFAULT_WIDTH_HEIGH,
     VPU_API_SET_INFO_CHANGE,
+    VPU_API_USE_FAST_MODE,
 } VPU_API_CMD;
 
 typedef struct {
diff --git a/mpp/codec/dec/h265/h265d_parser.c b/mpp/codec/dec/h265/h265d_parser.c
index 86c80517..7b180e18 100644
--- a/mpp/codec/dec/h265/h265d_parser.c
+++ b/mpp/codec/dec/h265/h265d_parser.c
@@ -1240,6 +1240,9 @@ static RK_S32 parser_nal_unit(HEVCContext *s, const RK_U8 *nal, int length)
             s->poc <= s->max_ra) {
             s->is_decoded = 0;
             break;
+        } else if (s->poc < s->max_ra) { //when seek to I slice skip the stream small then I slic poc
+            s->is_decoded = 0;
+            break;
         } else {
             if (s->nal_unit_type == NAL_RASL_R && s->poc > s->max_ra)
                 s->max_ra = INT_MIN;
@@ -1482,6 +1485,9 @@ static RK_S32 split_nal_units(HEVCContext *s, RK_U8 *buf, RK_U32 length)
         if (!s->is_nalff)
             extract_length = length;
 
+        if (!extract_length) {
+            return MPP_OK;
+        }
         if (s->nals_allocated < 1) {
             RK_S32 new_size = s->nals_allocated + 10;
             HEVCNAL *tmp = mpp_malloc(HEVCNAL, new_size);
diff --git a/mpp/codec/dec/h265/test/h265d_parser_test.c b/mpp/codec/dec/h265/test/h265d_parser_test.c
index 25143cf5..954c3ac9 100644
--- a/mpp/codec/dec/h265/test/h265d_parser_test.c
+++ b/mpp/codec/dec/h265/test/h265d_parser_test.c
@@ -368,6 +368,7 @@ RK_S32 hevc_parser_test(ParserDemoCmdContext_t *cmd)
     parser_cfg.frame_slots = slots;
     parser_cfg.packet_slots = packet_slots;
     parser_cfg.need_split = 1;
+    memset(&hal_cfg, 0, sizeof(hal_cfg));
     hal_cfg.frame_slots = slots;
     hal_cfg.packet_slots = packet_slots;
     h265d_init(mpp_codex_ctx, &parser_cfg);
diff --git a/mpp/codec/inc/mpp_dec.h b/mpp/codec/inc/mpp_dec.h
index b652283d..7b1fb7de 100644
--- a/mpp/codec/inc/mpp_dec.h
+++ b/mpp/codec/inc/mpp_dec.h
@@ -37,6 +37,7 @@ struct MppDec_t {
 
     // dec parser thread runtime resource context
     MppPacket           mpp_pkt_in;
+    RK_U32              fast_mode;
 };
 
 
@@ -53,7 +54,7 @@ void *mpp_dec_hal_thread(void *data);
 /*
  *
  */
-MPP_RET mpp_dec_init(MppDec **dec, MppCodingType coding);
+MPP_RET mpp_dec_init(MppDec *dec, MppCodingType coding);
 MPP_RET mpp_dec_deinit(MppDec *dec);
 
 MPP_RET mpp_dec_reset(MppDec *dec);
diff --git a/mpp/codec/mpp_dec.cpp b/mpp/codec/mpp_dec.cpp
index 5ead737e..eb8ba7ba 100644
--- a/mpp/codec/mpp_dec.cpp
+++ b/mpp/codec/mpp_dec.cpp
@@ -151,6 +151,7 @@ static RK_U32 reset_dec_task(Mpp *mpp, DecTask *task)
     MppBufSlots packet_slots = dec->packet_slots;
     HalDecTask *task_dec = &task->info.dec;
 
+    if (!dec->fast_mode) {
     if (!task->status.prev_task_rdy) {
         HalTaskHnd task_prev = NULL;
         hal_task_get_hnd(tasks, TASK_PROC_DONE, &task_prev);
@@ -162,6 +163,12 @@ static RK_U32 reset_dec_task(Mpp *mpp, DecTask *task)
         } else {
             msleep(5);
             task->wait.prev_task = 1;
+                return MPP_NOK;
+            }
+        }
+    } else {
+        if (hal_task_check_empty(tasks, TASK_PROCESSING)) {
+            msleep(5);
             return MPP_NOK;
         }
     }
@@ -347,6 +354,7 @@ static MPP_RET try_proc_dec_task(Mpp *mpp, DecTask *task)
         task->status.dec_pkt_copy_rdy = 1;
     }
 
+    if (!dec->fast_mode) {
     // wait previous task done
     if (!task->status.prev_task_rdy) {
         HalTaskHnd task_prev = NULL;
@@ -361,6 +369,7 @@ static MPP_RET try_proc_dec_task(Mpp *mpp, DecTask *task)
             return MPP_NOK;
         }
     }
+    }
     if (mpp->mFrameGroup) {
         task->wait.dec_pic_buf = (mpp_buffer_group_unused(mpp->mFrameGroup) < 1);
         if (task->wait.dec_pic_buf)
@@ -642,7 +651,13 @@ void *mpp_dec_hal_thread(void *data)
             // TODO: may have risk here
             hal_task_hnd_set_status(task, TASK_PROC_DONE);
             task = NULL;
-
+            if (dec->fast_mode) {
+               
+                hal_task_get_hnd(tasks, TASK_PROC_DONE, &task);
+                if (task) {
+                    hal_task_hnd_set_status(task, TASK_IDLE);
+                }
+            }
             mpp->mThreadCodec->signal();
 
             mpp_buf_slot_clr_flag(frame_slots, task_dec->output, SLOT_HAL_OUTPUT);
@@ -674,16 +689,19 @@ void *mpp_dec_hal_thread(void *data)
     return NULL;
 }
 
-MPP_RET mpp_dec_init(MppDec **dec, MppCodingType coding)
+MPP_RET mpp_dec_init(MppDec *dec, MppCodingType coding)
 {
     MPP_RET ret;
     MppBufSlots frame_slots = NULL;
     MppBufSlots packet_slots = NULL;
     Parser parser = NULL;
     MppHal hal = NULL;
+    MppDec *p = dec;
+    RK_S32 task_count = 2;
 	HalIOInterruptCB cb = {NULL, NULL};
-
-    MppDec *p = mpp_calloc(MppDec, 1);
+    if (dec->fast_mode) {
+        task_count = 3;
+    }
     if (NULL == p) {
         mpp_err_f("failed to malloc context\n");
         return MPP_ERR_NULL_PTR;
@@ -702,13 +720,13 @@ MPP_RET mpp_dec_init(MppDec **dec, MppCodingType coding)
             break;
         }
 
-        mpp_buf_slot_setup(packet_slots, 2);
+        mpp_buf_slot_setup(packet_slots, task_count);
 
         ParserCfg parser_cfg = {
             coding,
             frame_slots,
             packet_slots,
-            2,
+            task_count,
             0,
         };
 
@@ -729,6 +747,7 @@ MPP_RET mpp_dec_init(MppDec **dec, MppCodingType coding)
             packet_slots,
             NULL,
             parser_cfg.task_count,
+            dec->fast_mode,
             cb,
         };
 
@@ -744,12 +763,10 @@ MPP_RET mpp_dec_init(MppDec **dec, MppCodingType coding)
         p->tasks  = hal_cfg.tasks;
         p->frame_slots  = frame_slots;
         p->packet_slots = packet_slots;
-        *dec = p;
         return MPP_OK;
     } while (0);
 
     mpp_dec_deinit(p);
-    *dec = NULL;
     return MPP_NOK;
 }
 
diff --git a/mpp/hal/hal_task.cpp b/mpp/hal/hal_task.cpp
index 65c5a86b..11944205 100644
--- a/mpp/hal/hal_task.cpp
+++ b/mpp/hal/hal_task.cpp
@@ -140,6 +140,20 @@ MPP_RET hal_task_get_hnd(HalTaskGroup group, MppTaskStatus status, HalTaskHnd *h
     return MPP_OK;
 }
 
+MPP_RET hal_task_check_empty(HalTaskGroup group, MppTaskStatus status)
+{
+    if (NULL == group || status >= TASK_BUTT) {
+        mpp_err_f("found invaid input group %p status %d \n", group, status);
+        return MPP_ERR_UNKNOW;
+    }
+    HalTaskGroupImpl *p = (HalTaskGroupImpl *)group;
+    Mutex::Autolock auto_lock(p->lock);
+    struct list_head *list = &p->list[status];
+    if (list_empty(list)) {
+        return MPP_OK;
+    }
+    return MPP_NOK;
+}
 MPP_RET hal_task_get_count(HalTaskGroup group, MppTaskStatus status, RK_U32 *count)
 {
     if (NULL == group || status >= TASK_BUTT || NULL == count) {
diff --git a/mpp/hal/inc/hal_task.h b/mpp/hal/inc/hal_task.h
index 7913dbab..433ea92b 100644
--- a/mpp/hal/inc/hal_task.h
+++ b/mpp/hal/inc/hal_task.h
@@ -101,6 +101,7 @@ typedef struct HalDecTask_t {
     // current task input slot index
     RK_S32          input;
 
+    RK_S32          reg_index;
     // for test purpose
     // current tesk output slot index
     RK_S32          output;
@@ -185,6 +186,7 @@ MPP_RET hal_task_hnd_set_status(HalTaskHnd hnd, MppTaskStatus status);
 MPP_RET hal_task_hnd_set_info(HalTaskHnd hnd, HalTaskInfo *task);
 MPP_RET hal_task_hnd_get_info(HalTaskHnd hnd, HalTaskInfo *task);
 MPP_RET hal_task_info_init(HalTaskInfo *task, MppCtxType type);
+MPP_RET hal_task_check_empty(HalTaskGroup group, MppTaskStatus status);
 
 #ifdef __cplusplus
 }
diff --git a/mpp/hal/inc/mpp_hal.h b/mpp/hal/inc/mpp_hal.h
index fcb6ee21..758179e0 100644
--- a/mpp/hal/inc/mpp_hal.h
+++ b/mpp/hal/inc/mpp_hal.h
@@ -53,6 +53,7 @@ typedef struct MppHalCfg_t {
     // output
     HalTaskGroup    tasks;
     RK_S32          task_count;
+    RK_U32          fast_mode;
     HalIOInterruptCB hal_int_cb;
 } MppHalCfg;
 
diff --git a/mpp/hal/rkdec/h265d/hal_h265d_reg.c b/mpp/hal/rkdec/h265d/hal_h265d_reg.c
index 471d5bc9..70440c33 100644
--- a/mpp/hal/rkdec/h265d/hal_h265d_reg.c
+++ b/mpp/hal/rkdec/h265d/hal_h265d_reg.c
@@ -47,7 +47,15 @@
 FILE *fp = NULL;
 #endif
 
+#define MAX_GEN_REG 3
 RK_U32 h265h_debug = 0;
+typedef struct h265d_reg_buf {
+    RK_S32    use_flag;
+    MppBuffer scaling_list_data;
+    MppBuffer pps_data;
+    MppBuffer rps_data;
+    void*     hw_regs;
+} h265d_reg_buf_t;
 typedef struct h265d_reg_context {
     RK_S32 vpu_socket;
     MppBufSlots     slots;
@@ -58,6 +66,8 @@ typedef struct h265d_reg_context {
     MppBuffer pps_data;
     MppBuffer rps_data;
     void*     hw_regs;
+    h265d_reg_buf_t g_buf[MAX_GEN_REG];
+    RK_U32 fast_mode;
     HalIOInterruptCB int_cb;
 } h265d_reg_context_t;
 
@@ -255,6 +265,122 @@ static RK_U32 hevc_ver_align_256_odd(RK_U32 val)
 {
     return MPP_ALIGN(val, 256) | 256;
 }
+MPP_RET hal_h265d_alloc_res(void *hal)
+{
+    RK_S32 i = 0;
+    RK_S32 ret = 0;
+    h265d_reg_context_t *reg_cxt = (h265d_reg_context_t *)hal;
+    if (reg_cxt->fast_mode) {
+        for (i = 0; i < MAX_GEN_REG; i++) {
+            reg_cxt->g_buf[i].hw_regs = mpp_calloc_size(void, sizeof(H265d_REGS_t));
+            ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->g_buf[i].scaling_list_data, SCALING_LIST_SIZE);
+            if (MPP_OK != ret) {
+                mpp_err("h265d scaling_list_data get buffer failed\n");
+                return ret;
+            }
+
+            ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->g_buf[i].pps_data, PPS_SIZE);
+            if (MPP_OK != ret) {
+                mpp_err("h265d pps_data get buffer failed\n");
+                return ret;
+            }
+
+            ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->g_buf[i].rps_data, RPS_SIZE);
+            if (MPP_OK != ret) {
+                mpp_err("h265d rps_data get buffer failed\n");
+                return ret;
+            }
+        }
+    } else {
+        reg_cxt->hw_regs = mpp_calloc_size(void, sizeof(H265d_REGS_t));
+        ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->scaling_list_data, SCALING_LIST_SIZE);
+        if (MPP_OK != ret) {
+            mpp_err("h265d scaling_list_data get buffer failed\n");
+            return ret;
+        }
+
+        ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->pps_data, PPS_SIZE);
+        if (MPP_OK != ret) {
+            mpp_err("h265d pps_data get buffer failed\n");
+            return ret;
+        }
+
+        ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->rps_data, RPS_SIZE);
+        if (MPP_OK != ret) {
+            mpp_err("h265d rps_data get buffer failed\n");
+            return ret;
+        }
+
+    }
+    return MPP_OK;
+}
+
+MPP_RET hal_h265d_release_res(void *hal)
+{
+    RK_S32 ret = 0;
+    h265d_reg_context_t *reg_cxt = ( h265d_reg_context_t *)hal;
+    RK_S32 i = 0;
+    if (reg_cxt->fast_mode) {
+        for (i = 0; i < MAX_GEN_REG; i++) {
+            if (reg_cxt->g_buf[i].scaling_list_data) {
+                ret = mpp_buffer_put(reg_cxt->g_buf[i].scaling_list_data);
+                if (MPP_OK != ret) {
+                    mpp_err("h265d scaling_list_data free buffer failed\n");
+                    return ret;
+                }
+            }
+            if (reg_cxt->g_buf[i].pps_data) {
+                ret = mpp_buffer_put(reg_cxt->g_buf[i].pps_data);
+                if (MPP_OK != ret) {
+                    mpp_err("h265d pps_data free buffer failed\n");
+                    return ret;
+                }
+            }
+
+            if (reg_cxt->g_buf[i].rps_data) {
+                ret = mpp_buffer_put(reg_cxt->g_buf[i].rps_data);
+                if (MPP_OK != ret) {
+                    mpp_err("h265d rps_data free buffer failed\n");
+                    return ret;
+                }
+            }
+
+            if (reg_cxt->g_buf[i].hw_regs) {
+                mpp_free(reg_cxt->g_buf[i].hw_regs);
+                reg_cxt->g_buf[i].hw_regs = NULL;
+            }
+        }
+    } else {
+        if (reg_cxt->scaling_list_data) {
+            ret = mpp_buffer_put(reg_cxt->scaling_list_data);
+            if (MPP_OK != ret) {
+                mpp_err("h265d scaling_list_data free buffer failed\n");
+                return ret;
+            }
+        }
+        if (reg_cxt->pps_data) {
+            ret = mpp_buffer_put(reg_cxt->pps_data);
+            if (MPP_OK != ret) {
+                mpp_err("h265d pps_data free buffer failed\n");
+                return ret;
+            }
+        }
+
+        if (reg_cxt->g_buf[i].rps_data) {
+            ret = mpp_buffer_put(reg_cxt->rps_data);
+            if (MPP_OK != ret) {
+                mpp_err("h265d rps_data free buffer failed\n");
+                return ret;
+            }
+        }
+
+        if (reg_cxt->hw_regs) {
+            mpp_free(reg_cxt->hw_regs);
+            reg_cxt->hw_regs = NULL;
+        }
+    }
+    return MPP_OK;
+}
 
 MPP_RET hal_h265d_init(void *hal, MppHalCfg *cfg)
 {
@@ -269,6 +395,7 @@ MPP_RET hal_h265d_init(void *hal, MppHalCfg *cfg)
 
     reg_cxt->slots = cfg->frame_slots;
     reg_cxt->int_cb = cfg->hal_int_cb;
+    reg_cxt->fast_mode = cfg->fast_mode;
     mpp_slots_set_prop(reg_cxt->slots, SLOTS_HOR_ALIGN, hevc_ver_align_256_odd);
     mpp_slots_set_prop(reg_cxt->slots, SLOTS_VER_ALIGN, hevc_ver_align_8);
 
@@ -276,7 +403,11 @@ MPP_RET hal_h265d_init(void *hal, MppHalCfg *cfg)
     ///<- VPUClientInit
 #ifdef ANDROID
     if (reg_cxt->vpu_socket <= 0) {
-        reg_cxt->vpu_socket = VPUClientInit(VPU_DEC_RKV);
+        RK_S32 value = !!access("/dev/rkvdec", F_OK);
+        if (value)
+            reg_cxt->vpu_socket = VPUClientInit(VPU_DEC_HEVC);
+        else
+            reg_cxt->vpu_socket = VPUClientInit(VPU_DEC_RKV);
         if (reg_cxt->vpu_socket <= 0) {
             mpp_err("reg_cxt->vpu_socket <= 0\n");
             return MPP_ERR_UNKNOW;
@@ -296,8 +427,6 @@ MPP_RET hal_h265d_init(void *hal, MppHalCfg *cfg)
             return ret;
         }
     }
-    reg_cxt->hw_regs = mpp_calloc_size(void, sizeof(H265d_REGS_t));
-
     ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->cabac_table_data, sizeof(cabac_table));
     if (MPP_OK != ret) {
         mpp_err("h265d cabac_table get buffer failed\n");
@@ -308,25 +437,12 @@ MPP_RET hal_h265d_init(void *hal, MppHalCfg *cfg)
         mpp_err("h265d write cabac_table data failed\n");
         return ret;
     }
+    ret = hal_h265d_alloc_res(hal);
 
-    ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->scaling_list_data, SCALING_LIST_SIZE);
     if (MPP_OK != ret) {
-        mpp_err("h265d scaling_list_data get buffer failed\n");
+        mpp_err("hal_h265d_alloc_res failed\n");
         return ret;
     }
-
-    ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->pps_data, PPS_SIZE);
-    if (MPP_OK != ret) {
-        mpp_err("h265d pps_data get buffer failed\n");
-        return ret;
-    }
-
-    ret = mpp_buffer_get(reg_cxt->group, &reg_cxt->rps_data, RPS_SIZE);
-    if (MPP_OK != ret) {
-        mpp_err("h265d rps_data get buffer failed\n");
-        return ret;
-    }
-
     mpp_env_get_u32("h265h_debug", &h265h_debug, 0);
 
 #ifdef dump
@@ -355,24 +471,7 @@ MPP_RET hal_h265d_deinit(void *hal)
         return ret;
     }
 
-
-    ret = mpp_buffer_put(reg_cxt->scaling_list_data);
-    if (MPP_OK != ret) {
-        mpp_err("h265d scaling_list_data free buffer failed\n");
-        return ret;
-    }
-
-    ret = mpp_buffer_put(reg_cxt->pps_data);
-    if (MPP_OK != ret) {
-        mpp_err("h265d pps_data free buffer failed\n");
-        return ret;
-    }
-
-    ret = mpp_buffer_put(reg_cxt->rps_data);
-    if (MPP_OK != ret) {
-        mpp_err("h265d rps_data free buffer failed\n");
-        return ret;
-    }
+    hal_h265d_release_res(hal);
 
     if (reg_cxt->group) {
         ret = mpp_buffer_group_put(reg_cxt->group);
@@ -381,11 +480,6 @@ MPP_RET hal_h265d_deinit(void *hal)
             return ret;
         }
     }
-
-    if (reg_cxt->hw_regs) {
-        mpp_free(reg_cxt->hw_regs);
-        reg_cxt->hw_regs = NULL;
-    }
     return MPP_OK;
 }
 static RK_S32 _count = 0;
@@ -1292,6 +1386,7 @@ MPP_RET hal_h265d_gen_regs(void *hal,  HalTaskInfo *syn)
     RK_U32 log2_min_cb_size;
     RK_S32 width, height, numCuInWidth;
     RK_S32 stride_y, stride_uv, virstrid_y, virstrid_yuv;
+    RK_S32 i = 0;
 
     H265d_REGS_t *hw_regs;
     RK_S32 ret = MPP_SUCCESS;
@@ -1304,7 +1399,25 @@ MPP_RET hal_h265d_gen_regs(void *hal,  HalTaskInfo *syn)
     h265d_dxva2_picture_context_t *dxva_cxt = (h265d_dxva2_picture_context_t *)syn->dec.syntax.data;
     h265d_reg_context_t *reg_cxt = ( h265d_reg_context_t *)hal;
 
-    void *rps_ptr = mpp_buffer_get_ptr(reg_cxt->rps_data);
+    void *rps_ptr = NULL;
+    if (reg_cxt ->fast_mode) {
+        for (i = 0; i < MAX_GEN_REG; i++) {
+            if (!reg_cxt->g_buf[i].use_flag) {
+                syn->dec.reg_index = i;
+                reg_cxt->rps_data = reg_cxt->g_buf[i].rps_data;
+                reg_cxt->scaling_list_data = reg_cxt->g_buf[i].scaling_list_data;
+                reg_cxt->pps_data = reg_cxt->g_buf[i].pps_data;
+                reg_cxt->hw_regs = reg_cxt->g_buf[i].hw_regs;
+                reg_cxt->g_buf[i].use_flag = 1;
+                break;
+            }
+        }
+        if (i == MAX_GEN_REG) {
+            mpp_err("hevc rps buf all used");
+            return MPP_ERR_NOMEM;
+        }
+    }
+    rps_ptr = mpp_buffer_get_ptr(reg_cxt->rps_data);
     if (NULL == rps_ptr) {
 
         mpp_err("rps_data get ptr error");
@@ -1394,7 +1507,6 @@ MPP_RET hal_h265d_gen_regs(void *hal,  HalTaskInfo *syn)
     hw_regs->cabac_error_en = 0xfdfffffd;
 
 #ifdef ANDROID
-    int i = 0;
     for (i = 0; i < (RK_S32)MPP_ARRAY_ELEMS(dxva_cxt->pp.RefPicList); i++) {
         if (dxva_cxt->pp.RefPicList[i].bPicEntry != 0xff &&
             dxva_cxt->pp.RefPicList[i].bPicEntry != 0x7f) {
@@ -1429,16 +1541,32 @@ MPP_RET hal_h265d_gen_regs(void *hal,  HalTaskInfo *syn)
 MPP_RET hal_h265d_start(void *hal, HalTaskInfo *task)
 {
     MPP_RET ret = MPP_OK;
+    RK_U8* p = NULL;
+    H265d_REGS_t *hw_regs = NULL;
     h265d_reg_context_t *reg_cxt = (h265d_reg_context_t *)hal;
-    RK_U8* p = (RK_U8*)reg_cxt->hw_regs;
+    RK_S32 index =  task->dec.reg_index;
+
     RK_S32 i;
-    (void) task;
+    if (reg_cxt->fast_mode) {
+        p = (RK_U8*)reg_cxt->g_buf[index].hw_regs;
+        hw_regs = ( H265d_REGS_t *)reg_cxt->g_buf[index].hw_regs;
+    } else {
+        p = (RK_U8*)reg_cxt->hw_regs;
+        hw_regs = ( H265d_REGS_t *)reg_cxt->hw_regs;
+    }
+
+    if(hw_regs == NULL){
+        mpp_err("hal_h265d_start hw_regs is NULL");
+        return MPP_ERR_NULL_PTR;
+    }
     for (i = 0; i < 68; i++) {
         h265h_dbg(H265H_DBG_REG, "RK_HEVC_DEC: regs[%02d]=%08X\n", i, *((RK_U32*)p));
+        //mpp_log("RK_HEVC_DEC: regs[%02d]=%08X\n", i, *((RK_U32*)p));
         p += 4;
     }
 #ifdef ANDROID
-    ret = VPUClientSendReg(reg_cxt->vpu_socket, (RK_U32*)reg_cxt->hw_regs, 68); // 68 is the nb of uint32_t
+    ret = VPUClientSendReg(reg_cxt->vpu_socket, (RK_U32*)hw_regs, 68); // 68 is the nb of uint32_t
+
     if (ret != 0) {
         mpp_err("RK_HEVC_DEC: ERROR: VPUClientSendReg Failed!!!\n");
         return MPP_ERR_VPUHW;
@@ -1455,15 +1583,24 @@ MPP_RET hal_h265d_wait(void *hal, HalTaskInfo *task)
     (void)task;
     (void) hal;
 #ifdef ANDROID
+    RK_S32 index =  task->dec.reg_index;
     h265d_reg_context_t *reg_cxt = (h265d_reg_context_t *)hal;
-    RK_U8* p = (RK_U8*)reg_cxt->hw_regs;
-    H265d_REGS_t *hw_regs = ( H265d_REGS_t *)reg_cxt->hw_regs;
+    RK_U8* p = NULL;
+    H265d_REGS_t *hw_regs = NULL;
     RK_S32 i;
     VPU_CMD_TYPE cmd;
     RK_S32 len;
-    ret = VPUClientWaitResult(reg_cxt->vpu_socket, (RK_U32*)reg_cxt->hw_regs, 68, &cmd, &len);
+    if (reg_cxt->fast_mode) {
+        hw_regs = ( H265d_REGS_t *)reg_cxt->g_buf[index].hw_regs;
+    } else {
+        hw_regs = ( H265d_REGS_t *)reg_cxt->hw_regs;
+    }
+    p = (RK_U8*)hw_regs;
+    ret = VPUClientWaitResult(reg_cxt->vpu_socket, (RK_U32*)hw_regs, 68, &cmd, &len);
     if ((hw_regs->sw_interrupt.sw_dec_error_sta ||
-         hw_regs->sw_interrupt.sw_dec_empty_sta) && reg_cxt->int_cb.callBack) {
+         hw_regs->sw_interrupt.sw_dec_empty_sta) &&
+        reg_cxt->int_cb.callBack &&
+        !reg_cxt->fast_mode) {
         reg_cxt->int_cb.callBack(reg_cxt->int_cb.opaque, NULL);
     }
     for (i = 0; i < 68; i++) {
@@ -1476,6 +1613,9 @@ MPP_RET hal_h265d_wait(void *hal, HalTaskInfo *task)
         }
         p += 4;
     }
+    if (reg_cxt->fast_mode) {
+        reg_cxt->g_buf[index].use_flag = 0;
+    }
 #endif
 
     return ret;
diff --git a/mpp/legacy/vpu_api.cpp b/mpp/legacy/vpu_api.cpp
index 7df97f3e..5cfe5c11 100644
--- a/mpp/legacy/vpu_api.cpp
+++ b/mpp/legacy/vpu_api.cpp
@@ -19,6 +19,7 @@
 #include <string.h>
 #ifdef ANDROID
 #include <dlfcn.h>
+#include <unistd.h>
 #endif
 
 #include "mpp_log.h"
@@ -197,10 +198,12 @@ RK_S32 open_orign_vpu(VpuCodecContext **ctx)
 {
     void *rkapi_hdl = NULL;
     RK_S32 (*rkvpu_open_cxt)(VpuCodecContext **ctx);
-    rkapi_hdl = dlopen("/system/lib/librk_vpuapi.so", RTLD_LAZY);
-    if (rkapi_hdl == NULL) {
-        mpp_log("dlopen librk_vpuapi library fail\n");
+    RK_S32 value = !!access("/dev/rkvdec", F_OK);
+    if (value) {
         rkapi_hdl = dlopen("/system/lib/librk_on2.so", RTLD_LAZY);
+    }
+    if (rkapi_hdl == NULL) {
+        rkapi_hdl = dlopen("/system/lib/librk_vpuapi.so", RTLD_LAZY);
         if (rkapi_hdl == NULL) {
             return -1;
         }
@@ -220,11 +223,13 @@ RK_S32 open_orign_vpu(VpuCodecContext **ctx)
 RK_S32 close_orign_vpu(VpuCodecContext **ctx)
 {
     void *rkapi_hdl = NULL;
+    RK_S32 value = !!access("/dev/rkvdec", F_OK);
     RK_S32 (*rkvpu_close_cxt)(VpuCodecContext **ctx);
-    rkapi_hdl = dlopen("/system/lib/librk_vpuapi.so", RTLD_LAZY);
-    if (rkapi_hdl == NULL) {
-        mpp_log("dlopen librk_vpuapi library fail\n");
+    if (value) {
         rkapi_hdl = dlopen("/system/lib/librk_on2.so", RTLD_LAZY);
+    }
+    if (rkapi_hdl == NULL) {
+        rkapi_hdl = dlopen("/system/lib/librk_vpuapi.so", RTLD_LAZY);
         if (rkapi_hdl == NULL) {
             return -1;
         }
@@ -247,6 +252,8 @@ RK_S32 vpu_open_context(VpuCodecContext **ctx)
     RK_U32 value;
     mpp_env_get_u32("chg_orig", &value, 0);
 #ifdef ANDROID
+    value = value || (!!access("/dev/rkvdec", F_OK));
+    value = (value & (s->videoCoding != OMX_RK_VIDEO_CodingHEVC));
     if (value || !s) {
         if (s) {
             free(s);
diff --git a/mpp/legacy/vpu_api_legacy.cpp b/mpp/legacy/vpu_api_legacy.cpp
index e279a1fe..d67b7e12 100644
--- a/mpp/legacy/vpu_api_legacy.cpp
+++ b/mpp/legacy/vpu_api_legacy.cpp
@@ -30,6 +30,7 @@ VpuApi::VpuApi()
 #ifdef DUMP_YUV
     fp = fopen("data/hevcdump.yuv", "wb");
 #endif
+    mpp_construct(&mpp_ctx, &mpi);
     frame_count  = 0;
     mpp_log_f("ok\n");
 
@@ -57,7 +58,11 @@ RK_S32 VpuApi::init(VpuCodecContext *ctx, RK_U8 *extraData, RK_U32 extra_size)
         return MPP_ERR_VPU_CODEC_INIT;
     }
 
-    ret = mpp_init(&mpp_ctx, &mpi, type, (MppCodingType)ctx->videoCoding);
+    if (mpp_ctx == NULL || mpi == NULL) {
+        mpp_err("found invalid context input");
+        return MPP_ERR_NULL_PTR;
+    }
+    ret = mpp_init(mpp_ctx, type, (MppCodingType)ctx->videoCoding);
 
     VPU_GENERIC vpug;
     vpug.CodecType  = ctx->codecType;
@@ -253,6 +258,10 @@ RK_S32 VpuApi::control(VpuCodecContext *ctx, VPU_API_CMD cmd, void *param)
         mpicmd = MPP_CODEC_SET_INFO_CHANGE_READY;
         break;
     }
+    case VPU_API_USE_FAST_MODE: {
+        mpicmd = MPP_DEC_USE_FAST_MODE;
+        break;
+    }
     default: {
         break;
     }
diff --git a/mpp/mpi.cpp b/mpp/mpi.cpp
index f5fb8ca5..5b88e9e5 100644
--- a/mpp/mpi.cpp
+++ b/mpp/mpi.cpp
@@ -128,8 +128,11 @@ static MPP_RET mpi_encode_get_packet(MppCtx ctx, MppPacket *packet)
 static MPP_RET mpi_flush(MppCtx ctx)
 {
     MpiImpl *p = (MpiImpl *)ctx;
+    MPP_RET ret = MPP_OK;
     MPI_FUNCTION_ENTER();
-    MPP_RET ret = p->ctx->reset();
+    if (p->ctx->mInitDone) {
+        ret = p->ctx->reset();
+    }
     MPI_FUNCTION_LEAVE();
     return ret;
 }
@@ -158,16 +161,15 @@ static MppApi mpp_api = {
     {0},
 };
 
-MPP_RET mpp_init(MppCtx *ctx, MppApi **mpi, MppCtxType type, MppCodingType coding)
+MPP_RET mpp_construct(MppCtx *ctx, MppApi **mpi)
 {
+
     MpiImpl *p;
+
     MPI_FUNCTION_ENTER();
 
-    if (NULL == ctx || NULL == mpi ||
-        type >= MPP_CTX_BUTT ||
-        coding >= MPP_VIDEO_CodingMax) {
-        mpp_err("mpp_init invalid input ctx %p mpi %p type %d coding %d\n",
-                ctx, mpi, type, coding);
+    if (NULL == ctx || NULL == mpi) {
+        mpp_err("mpp_init invalid input ctx %p mpi %p\n", ctx, mpi);
         return MPP_ERR_NULL_PTR;
     }
 
@@ -181,23 +183,39 @@ MPP_RET mpp_init(MppCtx *ctx, MppApi **mpi, MppCtxType type, MppCodingType codin
     }
 
     memset(p, 0, sizeof(*p));
-
-    p->ctx = new Mpp(type, coding);
+    p->ctx = new Mpp();
     if (NULL == p->ctx) {
         mpp_free(p);
-        mpp_err("mpp_init failed to new Mpp\n");
+        mpp_err("mpp_construct failed to new Mpp\n");
         return MPP_ERR_MALLOC;
     }
-
     p->api      = &mpp_api;
     p->check    = p;
-    p->type     = type;
-    p->coding   = coding;
     *ctx = p;
     *mpi = p->api;
+    MPI_FUNCTION_LEAVE_OK();
+    return MPP_OK;
+}
+
+
+MPP_RET mpp_init(MppCtx ctx, MppCtxType type, MppCodingType coding)
+{
+    MpiImpl *p = (MpiImpl*)ctx;
+    MPI_FUNCTION_ENTER();
+
+    if (NULL == ctx ||
+        type >= MPP_CTX_BUTT ||
+        coding >= MPP_VIDEO_CodingMax) {
+        mpp_err("mpp_init invalid input ctx %p type %d coding %d\n",
+                ctx, type, coding);
+        return MPP_ERR_NULL_PTR;
+    }
+
+    p->ctx->init(type, coding);
+    p->type     = type;
+    p->coding   = coding;
 
     get_mpi_debug();
-
     MPI_FUNCTION_LEAVE_OK();
     return MPP_OK;
 }
diff --git a/mpp/mpp.cpp b/mpp/mpp.cpp
index fe3dfeb0..ae1246e8 100644
--- a/mpp/mpp.cpp
+++ b/mpp/mpp.cpp
@@ -33,7 +33,7 @@
 #define MPP_TEST_FRAME_SIZE     SZ_1M
 #define MPP_TEST_PACKET_SIZE    SZ_512K
 
-Mpp::Mpp(MppCtxType type, MppCodingType coding)
+Mpp::Mpp()
     : mPackets(NULL),
       mFrames(NULL),
       mTasks(NULL),
@@ -50,26 +50,45 @@ Mpp::Mpp(MppCtxType type, MppCodingType coding)
       mThreadHal(NULL),
       mDec(NULL),
       mEnc(NULL),
-      mType(type),
-      mCoding(coding),
+      mFastMode(0),
+      mInitDone(0),
+      mType(MPP_CTX_BUTT),
+      mCoding(MPP_VIDEO_CodingUnused),
       mPacketBlock(0),
       mOutputBlock(0),
       mMultiFrame(0),
       mStatus(0)
 {
+}
+MPP_RET Mpp::init(MppCtxType type, MppCodingType coding)
+{
+
+    mType = type;
+    mCoding = coding;
     switch (mType) {
     case MPP_CTX_DEC : {
+        mDec = mpp_calloc(MppDec, 1);
+        if (NULL == mDec) {
+            mpp_err_f("failed to malloc context\n");
+            return MPP_ERR_NULL_PTR;
+        }
+
         mPackets    = new mpp_list((node_destructor)mpp_packet_deinit);
         mFrames     = new mpp_list((node_destructor)mpp_frame_deinit);
         mTasks      = new mpp_list((node_destructor)NULL);
 
-        mpp_dec_init(&mDec, coding);
+        if (MPP_VIDEO_CodingHEVC == coding) {
+            mDec->fast_mode = mFastMode;
+        }
+
+        mpp_dec_init(mDec, coding);
+
         mThreadCodec = new MppThread(mpp_dec_parser_thread, this);
         mThreadHal  = new MppThread(mpp_dec_hal_thread, this);
 
         mpp_buffer_group_get_internal(&mInternalGroup, MPP_BUFFER_TYPE_ION);
         mpp_buffer_group_get_internal(&mPacketGroup, MPP_BUFFER_TYPE_ION);
-        mpp_buffer_group_limit_config(mPacketGroup, 0, 2);
+        mpp_buffer_group_limit_config(mPacketGroup, 0, 3);
 
     } break;
     case MPP_CTX_ENC : {
@@ -101,7 +120,9 @@ Mpp::Mpp(MppCtxType type, MppCodingType coding)
         clear();
     }
 
+    mInitDone = 1;
     mpp_env_get_u32("mpp_debug", &mpp_debug, 0);
+    return MPP_OK;
 }
 
 Mpp::~Mpp ()
@@ -250,8 +271,8 @@ MPP_RET Mpp::control(MpiCmd cmd, MppParam param)
         mpp_log("mpi_control group %p\n", param);
         mFrameGroup = (MppBufferGroup)param;
         mpp_buffer_group_set_listener((MppBufferGroupImpl *)param, (void *)mThreadCodec);
-		mpp_log("signal codec thread\n");
-		mThreadCodec->signal();
+        mpp_log("signal codec thread\n");
+        mThreadCodec->signal();
         break;
     }
     case MPP_SET_OUTPUT_BLOCK: {
@@ -270,6 +291,11 @@ MPP_RET Mpp::control(MpiCmd cmd, MppParam param)
         mpp_dec_control(mDec, cmd, param);
         break;
     }
+    case MPP_DEC_USE_FAST_MODE: {
+        RK_U32 mode = *((RK_U32 *)param);
+        mFastMode = mode;
+        break;
+    }
     default : {
     } break;
     }
diff --git a/mpp/mpp.h b/mpp/mpp.h
index 5bf42eca..10bc89e2 100644
--- a/mpp/mpp.h
+++ b/mpp/mpp.h
@@ -59,9 +59,9 @@
 class Mpp
 {
 public:
-    Mpp(MppCtxType type, MppCodingType coding);
+    Mpp();
     ~Mpp();
-
+    MPP_RET init(MppCtxType type, MppCodingType coding);
     MPP_RET put_packet(MppPacket packet);
     MPP_RET get_frame(MppFrame *frame);
 
@@ -101,6 +101,9 @@ public:
     MppDec          *mDec;
     MppEnc          *mEnc;
 
+    RK_U32          mFastMode;
+    RK_U32          mInitDone;
+
 private:
     void clear();
 
@@ -113,7 +116,6 @@ private:
 
     RK_U32          mStatus;
 
-    Mpp();
     Mpp(const Mpp &);
     Mpp &operator=(const Mpp &);
 };
diff --git a/test/mpi_test.c b/test/mpi_test.c
index 33ecd92c..84db6fc6 100644
--- a/test/mpi_test.c
+++ b/test/mpi_test.c
@@ -63,7 +63,13 @@ int mpi_test()
     mpp_log("mpi_test decoder test start\n");
 
     // decoder demo
-    ret = mpp_init(&ctx, &mpi, MPP_CTX_DEC, MPP_VIDEO_CodingUnused);
+    ret = mpp_construct(&ctx, &mpi);
+
+    if (MPP_OK != ret) {
+        mpp_err("mpp_construct failed\n");
+        goto MPP_TEST_FAILED;
+    }
+    ret = mpp_init(ctx, MPP_CTX_DEC, MPP_VIDEO_CodingUnused);
     if (MPP_OK != ret) {
         mpp_err("mpp_init failed\n");
         goto MPP_TEST_FAILED;
@@ -172,7 +178,13 @@ int mpi_test()
     mpp_log("mpi_test encoder test start\n");
 
     // encoder demo
-    ret = mpp_init(&ctx, &mpi, MPP_CTX_ENC, MPP_VIDEO_CodingUnused);
+    ret = mpp_construct(&ctx, &mpi);
+    if (MPP_OK != ret) {
+        mpp_err("mpp_construct failed\n");
+        goto MPP_TEST_FAILED;
+    }
+
+    ret = mpp_init(ctx, MPP_CTX_ENC, MPP_VIDEO_CodingUnused);
     if (MPP_OK != ret) {
         mpp_err("mpp_init failed\n");
         goto MPP_TEST_FAILED;