lavfi/dnn: refine dnn interface to add DNNExecBaseParams

Different function type of model requires different parameters, for
example, object detection detects lots of objects (cat/dog/...) in
the frame, and classifcation needs to know which object (cat or dog)
it is going to classify.

The current interface needs to add a new function with more parameters
to support new requirement, with this change, we can just add a new
struct (for example DNNExecClassifyParams) based on DNNExecBaseParams,
and so we can continue to use the current interface execute_model just
with params changed.

11 files changed, 139 insertions, 73 deletions

diff --git a/libavfilter/dnn/Makefile b/libavfilter/dnn/Makefile
index d6d58f4b61..4cfbce0efc 100644
--- a/libavfilter/dnn/Makefile
+++ b/libavfilter/dnn/Makefile
@@ -2,6 +2,7 @@ OBJS-$(CONFIG_DNN)                           += dnn/dnn_interface.o
 OBJS-$(CONFIG_DNN)                           += dnn/dnn_io_proc.o
 OBJS-$(CONFIG_DNN)                           += dnn/queue.o
 OBJS-$(CONFIG_DNN)                           += dnn/safe_queue.o
+OBJS-$(CONFIG_DNN)                           += dnn/dnn_backend_common.o
 OBJS-$(CONFIG_DNN)                           += dnn/dnn_backend_native.o
 OBJS-$(CONFIG_DNN)                           += dnn/dnn_backend_native_layers.o
 OBJS-$(CONFIG_DNN)                           += dnn/dnn_backend_native_layer_avgpool.o
diff --git a/libavfilter/dnn/dnn_backend_common.c b/libavfilter/dnn/dnn_backend_common.c
new file mode 100644
index 0000000000..a522ab5650
--- /dev/null
+++ b/libavfilter/dnn/dnn_backend_common.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DNN common functions different backends.
+ */
+
+#include "dnn_backend_common.h"
+
+int ff_check_exec_params(void *ctx, DNNBackendType backend, DNNFunctionType func_type, DNNExecBaseParams *exec_params)
+{
+    if (!exec_params) {
+        av_log(ctx, AV_LOG_ERROR, "exec_params is null when execute model.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (!exec_params->in_frame) {
+        av_log(ctx, AV_LOG_ERROR, "in frame is NULL when execute model.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (!exec_params->out_frame) {
+        av_log(ctx, AV_LOG_ERROR, "out frame is NULL when execute model.\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (exec_params->nb_output != 1 && backend != DNN_TF) {
+        // currently, the filter does not need multiple outputs,
+        // so we just pending the support until we really need it.
+        avpriv_report_missing_feature(ctx, "multiple outputs");
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
diff --git a/libavfilter/dnn/dnn_backend_common.h b/libavfilter/dnn/dnn_backend_common.h
new file mode 100644
index 0000000000..cd9c0f5339
--- /dev/null
+++ b/libavfilter/dnn/dnn_backend_common.h
@@ -0,0 +1,31 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * DNN common functions different backends.
+ */
+
+#ifndef AVFILTER_DNN_DNN_BACKEND_COMMON_H
+#define AVFILTER_DNN_DNN_BACKEND_COMMON_H
+
+#include "../dnn_interface.h"
+
+int ff_check_exec_params(void *ctx, DNNBackendType backend, DNNFunctionType func_type, DNNExecBaseParams *exec_params);
+
+#endif
diff --git a/libavfilter/dnn/dnn_backend_native.c b/libavfilter/dnn/dnn_backend_native.c
index d9762eeaf6..b5f1c16538 100644
--- a/libavfilter/dnn/dnn_backend_native.c
+++ b/libavfilter/dnn/dnn_backend_native.c
@@ -28,6 +28,7 @@
 #include "dnn_backend_native_layer_conv2d.h"
 #include "dnn_backend_native_layers.h"
 #include "dnn_io_proc.h"
+#include "dnn_backend_common.h"
 
 #define OFFSET(x) offsetof(NativeContext, x)
 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM
@@ -372,23 +373,17 @@ static DNNReturnType execute_model_native(const DNNModel *model, const char *inp
     return DNN_SUCCESS;
 }
 
-DNNReturnType ff_dnn_execute_model_native(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                          const char **output_names, uint32_t nb_output, AVFrame *out_frame)
+DNNReturnType ff_dnn_execute_model_native(const DNNModel *model, DNNExecBaseParams *exec_params)
 {
     NativeModel *native_model = model->model;
     NativeContext *ctx = &native_model->ctx;
 
-    if (!in_frame) {
-        av_log(ctx, AV_LOG_ERROR, "in frame is NULL when execute model.\n");
-        return DNN_ERROR;
-    }
-
-    if (!out_frame) {
-        av_log(ctx, AV_LOG_ERROR, "out frame is NULL when execute model.\n");
+    if (ff_check_exec_params(ctx, DNN_NATIVE, model->func_type, exec_params) != 0) {
         return DNN_ERROR;
     }
 
-    return execute_model_native(model, input_name, in_frame, output_names, nb_output, out_frame, 1);
+    return execute_model_native(model, exec_params->input_name, exec_params->in_frame,
+                                exec_params->output_names, exec_params->nb_output, exec_params->out_frame, 1);
 }
 
 int32_t ff_calculate_operand_dims_count(const DnnOperand *oprd)
diff --git a/libavfilter/dnn/dnn_backend_native.h b/libavfilter/dnn/dnn_backend_native.h
index d313c48f3a..89bcb8e358 100644
--- a/libavfilter/dnn/dnn_backend_native.h
+++ b/libavfilter/dnn/dnn_backend_native.h
@@ -130,8 +130,7 @@ typedef struct NativeModel{
 
 DNNModel *ff_dnn_load_model_native(const char *model_filename, DNNFunctionType func_type, const char *options, AVFilterContext *filter_ctx);
 
-DNNReturnType ff_dnn_execute_model_native(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                          const char **output_names, uint32_t nb_output, AVFrame *out_frame);
+DNNReturnType ff_dnn_execute_model_native(const DNNModel *model, DNNExecBaseParams *exec_params);
 
 void ff_dnn_free_model_native(DNNModel **model);
 
diff --git a/libavfilter/dnn/dnn_backend_openvino.c b/libavfilter/dnn/dnn_backend_openvino.c
index 9f3c696e0a..4e58ff6d9c 100644
--- a/libavfilter/dnn/dnn_backend_openvino.c
+++ b/libavfilter/dnn/dnn_backend_openvino.c
@@ -33,6 +33,7 @@
 #include "queue.h"
 #include "safe_queue.h"
 #include <c_api/ie_c_api.h>
+#include "dnn_backend_common.h"
 
 typedef struct OVOptions{
     char *device_type;
@@ -678,28 +679,14 @@ err:
     return NULL;
 }
 
-DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                      const char **output_names, uint32_t nb_output, AVFrame *out_frame)
+DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, DNNExecBaseParams *exec_params)
 {
     OVModel *ov_model = model->model;
     OVContext *ctx = &ov_model->ctx;
     TaskItem task;
     RequestItem *request;
 
-    if (!in_frame) {
-        av_log(ctx, AV_LOG_ERROR, "in frame is NULL when execute model.\n");
-        return DNN_ERROR;
-    }
-
-    if (!out_frame && model->func_type == DFT_PROCESS_FRAME) {
-        av_log(ctx, AV_LOG_ERROR, "out frame is NULL when execute model.\n");
-        return DNN_ERROR;
-    }
-
-    if (nb_output != 1) {
-        // currently, the filter does not need multiple outputs,
-        // so we just pending the support until we really need it.
-        avpriv_report_missing_feature(ctx, "multiple outputs");
+    if (ff_check_exec_params(ctx, DNN_OV, model->func_type, exec_params) != 0) {
         return DNN_ERROR;
     }
 
@@ -709,7 +696,7 @@ DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, const char *input_n
     }
 
     if (!ov_model->exe_network) {
-        if (init_model_ov(ov_model, input_name, output_names[0]) != DNN_SUCCESS) {
+        if (init_model_ov(ov_model, exec_params->input_name, exec_params->output_names[0]) != DNN_SUCCESS) {
             av_log(ctx, AV_LOG_ERROR, "Failed init OpenVINO exectuable network or inference request\n");
             return DNN_ERROR;
         }
@@ -717,10 +704,10 @@ DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, const char *input_n
 
     task.do_ioproc = 1;
     task.async = 0;
-    task.input_name = input_name;
-    task.in_frame = in_frame;
-    task.output_name = output_names[0];
-    task.out_frame = out_frame;
+    task.input_name = exec_params->input_name;
+    task.in_frame = exec_params->in_frame;
+    task.output_name = exec_params->output_names[0];
+    task.out_frame = exec_params->out_frame ? exec_params->out_frame : exec_params->in_frame;
     task.ov_model = ov_model;
 
     if (extract_inference_from_task(ov_model->model->func_type, &task, ov_model->inference_queue) != DNN_SUCCESS) {
@@ -737,26 +724,19 @@ DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, const char *input_n
     return execute_model_ov(request, ov_model->inference_queue);
 }
 
-DNNReturnType ff_dnn_execute_model_async_ov(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                            const char **output_names, uint32_t nb_output, AVFrame *out_frame)
+DNNReturnType ff_dnn_execute_model_async_ov(const DNNModel *model, DNNExecBaseParams *exec_params)
 {
     OVModel *ov_model = model->model;
     OVContext *ctx = &ov_model->ctx;
     RequestItem *request;
     TaskItem *task;
 
-    if (!in_frame) {
-        av_log(ctx, AV_LOG_ERROR, "in frame is NULL when async execute model.\n");
-        return DNN_ERROR;
-    }
-
-    if (!out_frame && model->func_type == DFT_PROCESS_FRAME) {
-        av_log(ctx, AV_LOG_ERROR, "out frame is NULL when async execute model.\n");
+    if (ff_check_exec_params(ctx, DNN_OV, model->func_type, exec_params) != 0) {
         return DNN_ERROR;
     }
 
     if (!ov_model->exe_network) {
-        if (init_model_ov(ov_model, input_name, output_names[0]) != DNN_SUCCESS) {
+        if (init_model_ov(ov_model, exec_params->input_name, exec_params->output_names[0]) != DNN_SUCCESS) {
             av_log(ctx, AV_LOG_ERROR, "Failed init OpenVINO exectuable network or inference request\n");
             return DNN_ERROR;
         }
@@ -770,10 +750,10 @@ DNNReturnType ff_dnn_execute_model_async_ov(const DNNModel *model, const char *i
 
     task->do_ioproc = 1;
     task->async = 1;
-    task->input_name = input_name;
-    task->in_frame = in_frame;
-    task->output_name = output_names[0];
-    task->out_frame = out_frame;
+    task->input_name = exec_params->input_name;
+    task->in_frame = exec_params->in_frame;
+    task->output_name = exec_params->output_names[0];
+    task->out_frame = exec_params->out_frame ? exec_params->out_frame : exec_params->in_frame;
     task->ov_model = ov_model;
     if (ff_queue_push_back(ov_model->task_queue, task) < 0) {
         av_freep(&task);
diff --git a/libavfilter/dnn/dnn_backend_openvino.h b/libavfilter/dnn/dnn_backend_openvino.h
index a484a7be32..046d0c5b5a 100644
--- a/libavfilter/dnn/dnn_backend_openvino.h
+++ b/libavfilter/dnn/dnn_backend_openvino.h
@@ -31,10 +31,8 @@
 
 DNNModel *ff_dnn_load_model_ov(const char *model_filename, DNNFunctionType func_type, const char *options, AVFilterContext *filter_ctx);
 
-DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                      const char **output_names, uint32_t nb_output, AVFrame *out_frame);
-DNNReturnType ff_dnn_execute_model_async_ov(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                            const char **output_names, uint32_t nb_output, AVFrame *out_frame);
+DNNReturnType ff_dnn_execute_model_ov(const DNNModel *model, DNNExecBaseParams *exec_params);
+DNNReturnType ff_dnn_execute_model_async_ov(const DNNModel *model, DNNExecBaseParams *exec_params);
 DNNAsyncStatusType ff_dnn_get_async_result_ov(const DNNModel *model, AVFrame **in, AVFrame **out);
 DNNReturnType ff_dnn_flush_ov(const DNNModel *model);
 
diff --git a/libavfilter/dnn/dnn_backend_tf.c b/libavfilter/dnn/dnn_backend_tf.c
index 076dd3d6a9..03fe310b03 100644
--- a/libavfilter/dnn/dnn_backend_tf.c
+++ b/libavfilter/dnn/dnn_backend_tf.c
@@ -34,7 +34,7 @@
 #include "dnn_backend_native_layer_pad.h"
 #include "dnn_backend_native_layer_maximum.h"
 #include "dnn_io_proc.h"
-
+#include "dnn_backend_common.h"
 #include <tensorflow/c/c_api.h>
 
 typedef struct TFOptions{
@@ -814,23 +814,17 @@ static DNNReturnType execute_model_tf(const DNNModel *model, const char *input_n
     return DNN_SUCCESS;
 }
 
-DNNReturnType ff_dnn_execute_model_tf(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                      const char **output_names, uint32_t nb_output, AVFrame *out_frame)
+DNNReturnType ff_dnn_execute_model_tf(const DNNModel *model, DNNExecBaseParams *exec_params)
 {
     TFModel *tf_model = model->model;
     TFContext *ctx = &tf_model->ctx;
 
-    if (!in_frame) {
-        av_log(ctx, AV_LOG_ERROR, "in frame is NULL when execute model.\n");
-        return DNN_ERROR;
-    }
-
-    if (!out_frame) {
-        av_log(ctx, AV_LOG_ERROR, "out frame is NULL when execute model.\n");
-        return DNN_ERROR;
+    if (ff_check_exec_params(ctx, DNN_TF, model->func_type, exec_params) != 0) {
+         return DNN_ERROR;
     }
 
-    return execute_model_tf(model, input_name, in_frame, output_names, nb_output, out_frame, 1);
+    return execute_model_tf(model, exec_params->input_name, exec_params->in_frame,
+                            exec_params->output_names, exec_params->nb_output, exec_params->out_frame, 1);
 }
 
 void ff_dnn_free_model_tf(DNNModel **model)
diff --git a/libavfilter/dnn/dnn_backend_tf.h b/libavfilter/dnn/dnn_backend_tf.h
index 8cec04748e..3dfd6e4280 100644
--- a/libavfilter/dnn/dnn_backend_tf.h
+++ b/libavfilter/dnn/dnn_backend_tf.h
@@ -31,8 +31,7 @@
 
 DNNModel *ff_dnn_load_model_tf(const char *model_filename, DNNFunctionType func_type, const char *options, AVFilterContext *filter_ctx);
 
-DNNReturnType ff_dnn_execute_model_tf(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                      const char **output_names, uint32_t nb_output, AVFrame *out_frame);
+DNNReturnType ff_dnn_execute_model_tf(const DNNModel *model, DNNExecBaseParams *exec_params);
 
 void ff_dnn_free_model_tf(DNNModel **model);
 
diff --git a/libavfilter/dnn_filter_common.c b/libavfilter/dnn_filter_common.c
index 1b922455a3..c085884eb4 100644
--- a/libavfilter/dnn_filter_common.c
+++ b/libavfilter/dnn_filter_common.c
@@ -90,14 +90,26 @@ DNNReturnType ff_dnn_get_output(DnnContext *ctx, int input_width, int input_heig
 
 DNNReturnType ff_dnn_execute_model(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame)
 {
-    return (ctx->dnn_module->execute_model)(ctx->model, ctx->model_inputname, in_frame,
-                                            (const char **)&ctx->model_outputname, 1, out_frame);
+    DNNExecBaseParams exec_params = {
+        .input_name     = ctx->model_inputname,
+        .output_names   = (const char **)&ctx->model_outputname,
+        .nb_output      = 1,
+        .in_frame       = in_frame,
+        .out_frame      = out_frame,
+    };
+    return (ctx->dnn_module->execute_model)(ctx->model, &exec_params);
 }
 
 DNNReturnType ff_dnn_execute_model_async(DnnContext *ctx, AVFrame *in_frame, AVFrame *out_frame)
 {
-    return (ctx->dnn_module->execute_model_async)(ctx->model, ctx->model_inputname, in_frame,
-                                                  (const char **)&ctx->model_outputname, 1, out_frame);
+    DNNExecBaseParams exec_params = {
+        .input_name     = ctx->model_inputname,
+        .output_names   = (const char **)&ctx->model_outputname,
+        .nb_output      = 1,
+        .in_frame       = in_frame,
+        .out_frame      = out_frame,
+    };
+    return (ctx->dnn_module->execute_model_async)(ctx->model, &exec_params);
 }
 
 DNNAsyncStatusType ff_dnn_get_async_result(DnnContext *ctx, AVFrame **in_frame, AVFrame **out_frame)
diff --git a/libavfilter/dnn_interface.h b/libavfilter/dnn_interface.h
index ae5a488341..941670675d 100644
--- a/libavfilter/dnn_interface.h
+++ b/libavfilter/dnn_interface.h
@@ -63,6 +63,14 @@ typedef struct DNNData{
     DNNColorOrder order;
 } DNNData;
 
+typedef struct DNNExecBaseParams {
+    const char *input_name;
+    const char **output_names;
+    uint32_t nb_output;
+    AVFrame *in_frame;
+    AVFrame *out_frame;
+} DNNExecBaseParams;
+
 typedef int (*FramePrePostProc)(AVFrame *frame, DNNData *model, AVFilterContext *filter_ctx);
 typedef int (*DetectPostProc)(AVFrame *frame, DNNData *output, uint32_t nb, AVFilterContext *filter_ctx);
 
@@ -96,11 +104,9 @@ typedef struct DNNModule{
     // Loads model and parameters from given file. Returns NULL if it is not possible.
     DNNModel *(*load_model)(const char *model_filename, DNNFunctionType func_type, const char *options, AVFilterContext *filter_ctx);
     // Executes model with specified input and output. Returns DNN_ERROR otherwise.
-    DNNReturnType (*execute_model)(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                   const char **output_names, uint32_t nb_output, AVFrame *out_frame);
+    DNNReturnType (*execute_model)(const DNNModel *model, DNNExecBaseParams *exec_params);
     // Executes model with specified input and output asynchronously. Returns DNN_ERROR otherwise.
-    DNNReturnType (*execute_model_async)(const DNNModel *model, const char *input_name, AVFrame *in_frame,
-                                         const char **output_names, uint32_t nb_output, AVFrame *out_frame);
+    DNNReturnType (*execute_model_async)(const DNNModel *model, DNNExecBaseParams *exec_params);
     // Retrieve inference result.
     DNNAsyncStatusType (*get_async_result)(const DNNModel *model, AVFrame **in, AVFrame **out);
     // Flush all the pending tasks.