vtc: add dump loc 1 quirk

README.md

@@ -54,6 +54,7 @@ Currently the following ones exist:
 | DILE_VT   | QUIRK_DILE_VT_NO_FREEZE_CAPTURE | Do not freeze frame before capturing (higher fps) | 0x2 |
 | DILE_VT   | QUIRK_DILE_VT_DUMP_LOCATION_2   | (webOS 3.4) Use undocumented dump location 2 | 0x4  |
 | VTCAPTURE   | QUIRK_VTCAPTURE_FORCE_CAPTURE   | Use of a custom kernel module for reenable capture in special situation | 0x100  |
+| VTCAPTURE   | QUIRK_VTCAPTURE_DUMP_LOCATION_1   | Use undocumented dump location 1, may provide better colors on some models | 0x200  |
 
 
 They can be provided in `config.json` via the `{"quirks": 0}` field or on commandline via `--quirks`.

src/backends/libvtcapture.cpp

@@ -52,7 +52,28 @@ int capture_init(cap_backend_config_t* config, void** state_p)
 
     // Sorry, no unlimited fps for you.
     self->props.frm = config->fps == 0 ? 60 : config->fps;
-    self->props.dump = 2;
+    /*
+     * 1. V4L2_EXT_CAPTURE_SCALER_INPUT
+     *   - LG uses this location only when VTV mode.
+     *   - If not supported, the ioctl should be returned -1 and the errno variable should be set to ENOTSUP.
+     * 2. V4L2_EXT_CAPTURE_SCALER_OUTPUT
+     *   - Recommend location
+     *      - Before PQ processing, after de-interlace block
+     *      - The frame is a progressive type.
+     *   - Alternative location due to chip limitation
+     *      - Before PQ processing, before de-interlace block
+     *      - The frame is an interlace type.
+     * 3. V4L2_EXT_CAPTURE_DISPLAY_OUTPUT
+     *   - Capture a video after PQ processing and before OSD blending.
+     *   - The frame size calculated with ARC applied.
+     * 4. V4L2_EXT_CAPTURE_BLENDED_OUTPUT
+     *   - Capture a video after OSD blending.
+     *   - If not supported, the ioctl should be returned -1 and the errno variable should be set to ENOTSUP.
+     * 5. V4L2_EXT_CAPTURE_OSD_OUTPUT
+     *   - Capture a OSD output.
+     *   - If not supported, the ioctl should be returned -1 and the errno variable should be set to ENOTSUP.
+     */
+    self->props.dump = HAS_QUIRK(config->quirks, QUIRK_VTCAPTURE_DUMP_LOCATION_1) ? 1 : 2;
     self->props.loc.x = 0;
     self->props.loc.y = 0;
     self->props.reg.w = config->resolution_width;

src/quirks.h

@@ -15,5 +15,8 @@ enum CAPTURE_QUIRKS {
 
     // vtCapture
     // Reenables video capture using custom kernel module
-    QUIRK_VTCAPTURE_FORCE_CAPTURE = 0x100
+    QUIRK_VTCAPTURE_FORCE_CAPTURE = 0x100,
+
+    // Capture frames at V4L2_EXT_CAPTURE_SCALER_INPUT = 1 (before V4L2_EXT_CAPTURE_SCALER_OUTPUT = 2)
+    QUIRK_VTCAPTURE_DUMP_LOCATION_1 = 0x200,
 };