[3/4]解决USB摄像头打开相机预览界面绿屏

liyujie

2025-08-28 867b8b7b729282c7e14e200ca277435329ebe747

 android/hardware/interfaces/camera/device/3.4/default/ExternalCameraDevice.cpp
old mode 100755new mode 100644
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@@ -38,8 +38,8 @@
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 // Other formats to consider in the future:
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 // * V4L2_PIX_FMT_YVU420 (== YV12)
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 // * V4L2_PIX_FMT_YVYU (YVYU: can be converted to YV12 or other YUV420_888 formats)
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-const std::array<uint32_t, /*size*/ 2> kSupportedFourCCs{
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-    {V4L2_PIX_FMT_MJPEG, V4L2_PIX_FMT_Z16}};  // double braces required in C++11
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+const std::array<uint32_t, /*size*/ 3> kSupportedFourCCs{
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+    {V4L2_PIX_FMT_MJPEG, V4L2_PIX_FMT_Z16, V4L2_PIX_FMT_YUYV}};  // double braces required in C++11
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 constexpr int MAX_RETRY = 5; // Allow retry v4l2 open failures a few times.
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 constexpr int OPEN_RETRY_SLEEP_US = 100000; // 100ms * MAX_RETRY = 0.5 seconds
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@@ -274,6 +274,7 @@
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         switch (fmt.fourcc) {
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             case V4L2_PIX_FMT_Z16: hasDepth = true; break;
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             case V4L2_PIX_FMT_MJPEG: hasColor = true; break;
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+            case V4L2_PIX_FMT_YUYV: hasColor = true; break;
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             default: ALOGW("%s: Unsupported format found", __FUNCTION__);
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         }
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     }
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@@ -705,6 +706,12 @@
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     // For V4L2_PIX_FMT_MJPEG
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     std::array<int, /*size*/ 3> halFormats{{HAL_PIXEL_FORMAT_BLOB, HAL_PIXEL_FORMAT_YCbCr_420_888,
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                                             HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED}};
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+    // For V4L2_PIX_FMT_YUYV
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+    std::array<int, /*size*/ 3> halYuyvFormats{{HAL_PIXEL_FORMAT_BLOB,
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+                                                HAL_PIXEL_FORMAT_YCbCr_420_888,
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+                                                HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED}};
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+    bool isMJPEG = false;
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+    bool isYUYV  = false;
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     for (const auto& supportedFormat : mSupportedFormats) {
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         switch (supportedFormat.fourcc) {
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@@ -713,6 +720,11 @@
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                 break;
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             case V4L2_PIX_FMT_MJPEG:
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                 hasColor = true;
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+                isMJPEG = true;
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+                break;
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+            case V4L2_PIX_FMT_YUYV:
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+                hasColor = true;
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+                isYUYV = true;
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                 break;
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             default:
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                 ALOGW("%s: format %c%c%c%c is not supported!", __FUNCTION__,
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@@ -729,11 +741,19 @@
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                 ANDROID_DEPTH_AVAILABLE_DEPTH_STALL_DURATIONS);
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     }
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     if (hasColor) {
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-        initOutputCharskeysByFormat(metadata, V4L2_PIX_FMT_MJPEG, halFormats,
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-                ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT,
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-                ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS,
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-                ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS,
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-                ANDROID_SCALER_AVAILABLE_STALL_DURATIONS);
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+        if (isMJPEG) {
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+            initOutputCharskeysByFormat(metadata, V4L2_PIX_FMT_MJPEG, halFormats,
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+                    ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT,
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+                    ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS,
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+                    ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS,
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+                    ANDROID_SCALER_AVAILABLE_STALL_DURATIONS);
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+        } else if (isYUYV) {
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+            initOutputCharskeysByFormat(metadata, V4L2_PIX_FMT_YUYV, halYuyvFormats,
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+                    ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT,
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+                    ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS,
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+                    ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS,
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+                    ANDROID_SCALER_AVAILABLE_STALL_DURATIONS);
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+        }
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     }
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     calculateMinFps(metadata);