codec2: C2AllocatorIon/DmaBuf: add support for padding
Bug: 181380463
Test: codec2_vndk_test
Change-Id: I7a196e28942ac1fa086772785c280248d1f4263b
diff --git a/media/codec2/vndk/C2DmaBufAllocator.cpp b/media/codec2/vndk/C2DmaBufAllocator.cpp
index 750aa31..7c8999b 100644
--- a/media/codec2/vndk/C2DmaBufAllocator.cpp
+++ b/media/codec2/vndk/C2DmaBufAllocator.cpp
@@ -16,11 +16,13 @@
//#define LOG_NDEBUG 0
#define LOG_TAG "C2DmaBufAllocator"
+
#include <BufferAllocator/BufferAllocator.h>
#include <C2Buffer.h>
#include <C2Debug.h>
#include <C2DmaBufAllocator.h>
#include <C2ErrnoUtils.h>
+
#include <linux/ion.h>
#include <sys/mman.h>
#include <unistd.h> // getpagesize, size_t, close, dup
@@ -28,14 +30,15 @@
#include <list>
-#ifdef __ANDROID_APEX__
#include <android-base/properties.h>
-#endif
namespace android {
namespace {
-constexpr size_t USAGE_LRU_CACHE_SIZE = 1024;
+ constexpr size_t USAGE_LRU_CACHE_SIZE = 1024;
+
+ // max padding after ion/dmabuf allocations in bytes
+ constexpr uint32_t MAX_PADDING = 0x8000; // 32KB
}
/* =========================== BUFFER HANDLE =========================== */
@@ -249,9 +252,23 @@
int bufferFd = -1;
int ret = 0;
- bufferFd = alloc.Alloc(heap_name, size, flags);
- if (bufferFd < 0) ret = bufferFd;
+ // NOTE: read this property directly from the property as this code has to run on
+ // Android Q, but the sysprop was only introduced in Android S.
+ static size_t sPadding =
+ base::GetUintProperty("media.c2.dmabuf.padding", (uint32_t)0, MAX_PADDING);
+ if (sPadding > SIZE_MAX - size) {
+ // size would overflow
+ ALOGD("dmabuf_alloc: size #%zx cannot accommodate padding #%zx", size, sPadding);
+ ret = -ENOMEM;
+ } else {
+ size_t allocSize = size + sPadding;
+ bufferFd = alloc.Alloc(heap_name, allocSize, flags);
+ if (bufferFd < 0) {
+ ret = bufferFd;
+ }
+ }
+ // this may be a non-working handle if bufferFd is negative
mHandle = C2HandleBuf(bufferFd, size);
mId = id;
mInit = c2_status_t(c2_map_errno<ENOMEM, EACCES, EINVAL>(ret));