From 91305c60261c77ad4a071062a21136fc0b6c5ab2 Mon Sep 17 00:00:00 2001
From: Maneesh Gupta <maneesh.gupta@amd.com>
Date: Tue, 28 Apr 2015 13:02:38 +0530
Subject: [PATCH] OpenCL: Fix ABI incompatibility issues

AVOpenCLDeviceNode and AVOpenCLPlatformNode used fixed static buffer for holding the device and platform name.
This patch modifies these structures to use pointers instead. The memory required to hold the names is
now dynamically allocated, the size for which is determined by querying appropriate OpenCL runtime APIs.

Signed-off-by: Maneesh Gupta <maneesh.gupta@amd.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavutil/opencl.c | 42 ++++++++++++++++++++++++++++++++++++++----
 libavutil/opencl.h | 10 ++--------
 2 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/libavutil/opencl.c b/libavutil/opencl.c
index 2df565329f..1d78214588 100644
--- a/libavutil/opencl.c
+++ b/libavutil/opencl.c
@@ -181,9 +181,11 @@ static void free_device_list(AVOpenCLDeviceList *device_list)
         if (!device_list->platform_node[i])
             continue;
         for (j = 0; j < device_list->platform_node[i]->device_num; j++) {
+            av_freep(&(device_list->platform_node[i]->device_node[j]->device_name));
             av_freep(&(device_list->platform_node[i]->device_node[j]));
         }
         av_freep(&device_list->platform_node[i]->device_node);
+        av_freep(&(device_list->platform_node[i]->platform_name));
         av_freep(&device_list->platform_node[i]);
     }
     av_freep(&device_list->platform_node);
@@ -198,6 +200,8 @@ static int get_device_list(AVOpenCLDeviceList *device_list)
     cl_platform_id *platform_ids = NULL;
     cl_device_id *device_ids = NULL;
     AVOpenCLDeviceNode *device_node = NULL;
+    size_t platform_name_size = 0;
+    size_t device_name_size = 0;
     status = clGetPlatformIDs(0, NULL, &device_list->platform_num);
     if (status != CL_SUCCESS) {
         av_log(&opencl_ctx, AV_LOG_ERROR,
@@ -232,8 +236,25 @@ static int get_device_list(AVOpenCLDeviceList *device_list)
         }
         device_list->platform_node[i]->platform_id = platform_ids[i];
         status = clGetPlatformInfo(platform_ids[i], CL_PLATFORM_VENDOR,
-                                   sizeof(device_list->platform_node[i]->platform_name),
-                                   device_list->platform_node[i]->platform_name, NULL);
+                                   0, NULL, &platform_name_size);
+        if (status != CL_SUCCESS) {
+            av_log(&opencl_ctx, AV_LOG_WARNING,
+                    "Could not get size of platform name: %s\n", av_opencl_errstr(status));
+        } else {
+            device_list->platform_node[i]->platform_name = av_malloc(platform_name_size * sizeof(char));
+            if (!device_list->platform_node[i]->platform_name) {
+                av_log(&opencl_ctx, AV_LOG_WARNING,
+                        "Could not allocate memory for device name: %s\n", av_opencl_errstr(status));
+            } else {
+                status = clGetPlatformInfo(platform_ids[i], CL_PLATFORM_VENDOR,
+                                           platform_name_size * sizeof(char),
+                                           device_list->platform_node[i]->platform_name, NULL);
+                if (status != CL_SUCCESS) {
+                    av_log(&opencl_ctx, AV_LOG_WARNING,
+                            "Could not get platform name: %s\n", av_opencl_errstr(status));
+                }
+            }
+        }
         total_devices_num = 0;
         for (j = 0; j < FF_ARRAY_ELEMS(device_type); j++) {
             status = clGetDeviceIDs(device_list->platform_node[i]->platform_id,
@@ -271,8 +292,21 @@ static int get_device_list(AVOpenCLDeviceList *device_list)
                     device_node->device_id = device_ids[k];
                     device_node->device_type = device_type[j];
                     status = clGetDeviceInfo(device_node->device_id, CL_DEVICE_NAME,
-                                             sizeof(device_node->device_name), device_node->device_name,
-                                             NULL);
+                                             0, NULL, &device_name_size);
+                    if (status != CL_SUCCESS) {
+                        av_log(&opencl_ctx, AV_LOG_WARNING,
+                                "Could not get size of device name: %s\n", av_opencl_errstr(status));
+                        continue;
+                    }
+                    device_node->device_name = av_malloc(device_name_size * sizeof(char));
+                    if (!device_node->device_name) {
+                        av_log(&opencl_ctx, AV_LOG_WARNING,
+                                "Could not allocate memory for device name: %s\n", av_opencl_errstr(status));
+                        continue;
+                    }
+                    status = clGetDeviceInfo(device_node->device_id, CL_DEVICE_NAME,
+                                             device_name_size * sizeof(char),
+                                             device_node->device_name, NULL);
                     if (status != CL_SUCCESS) {
                         av_log(&opencl_ctx, AV_LOG_WARNING,
                                 "Could not get device name: %s\n", av_opencl_errstr(status));
diff --git a/libavutil/opencl.h b/libavutil/opencl.h
index 0b7b8d4764..e423e5588a 100644
--- a/libavutil/opencl.h
+++ b/libavutil/opencl.h
@@ -44,21 +44,15 @@
 
 #define AV_OPENCL_KERNEL( ... )# __VA_ARGS__
 
-#define AV_OPENCL_MAX_KERNEL_NAME_SIZE 150
-
-#define AV_OPENCL_MAX_DEVICE_NAME_SIZE 100
-
-#define AV_OPENCL_MAX_PLATFORM_NAME_SIZE 100
-
 typedef struct {
     int device_type;
-    char device_name[AV_OPENCL_MAX_DEVICE_NAME_SIZE];
+    char *device_name;
     cl_device_id device_id;
 } AVOpenCLDeviceNode;
 
 typedef struct {
     cl_platform_id platform_id;
-    char platform_name[AV_OPENCL_MAX_PLATFORM_NAME_SIZE];
+    char *platform_name;
     int device_num;
     AVOpenCLDeviceNode **device_node;
 } AVOpenCLPlatformNode;