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Use DMA_BUF_IOCTL_SYNC to synchronize swframe copies

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This commit is contained in:
Cameron Gutman
2023-09-09 12:19:40 -05:00
parent 1d0b65f798
commit c98289a9e7
1 changed files with 11 additions and 0 deletions
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app/streaming/video/ffmpeg-renderers/drm.cpp
+11
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@@ -10,6 +10,8 @@ extern "C" {
} }
#include <libdrm/drm_fourcc.h> #include <libdrm/drm_fourcc.h>
#include <linux/dma-buf.h>
#include <sys/ioctl.h>
// Special Rockchip type // Special Rockchip type
#ifndef DRM_FORMAT_NA12 #ifndef DRM_FORMAT_NA12
@@ -768,6 +770,11 @@ bool DrmRenderer::mapSoftwareFrame(AVFrame *frame, AVDRMFrameDescriptor *mappedF
auto &layer = mappedFrame->layers[0]; auto &layer = mappedFrame->layers[0];
layer.format = drmFormat; layer.format = drmFormat;
// Prepare to write to the dumb buffer from the CPU
struct dma_buf_sync sync;
sync.flags = DMA_BUF_SYNC_START | DMA_BUF_SYNC_WRITE;
ioctl(drmFrame->primeFd, DMA_BUF_IOCTL_SYNC, &sync);
int lastPlaneSize = 0; int lastPlaneSize = 0;
for (int i = 0; i < 4; i++) { for (int i = 0; i < 4; i++) {
if (frame->data[i] != nullptr) { if (frame->data[i] != nullptr) {
@@ -811,6 +818,10 @@ bool DrmRenderer::mapSoftwareFrame(AVFrame *frame, AVDRMFrameDescriptor *mappedF
lastPlaneSize = drmFrame->pitch * planeHeight; lastPlaneSize = drmFrame->pitch * planeHeight;
} }
} }
// End the CPU write to the dumb buffer
sync.flags = DMA_BUF_SYNC_END | DMA_BUF_SYNC_WRITE;
ioctl(drmFrame->primeFd, DMA_BUF_IOCTL_SYNC, &sync);
} }
ret = true; ret = true;