Build WebRTC support

    * Update libvpx to required libwebrtc version
    * Build required webcam drivers
    * Mark wpewebkit as dependending on libvpx
    * Backport playbin3 from GStreamer 1.14
    * Build audio recording support
    * Implement an alsa based DeviceProvider
    * gstreamer: Backport latest GstStream* code

Author: thiblahute

board/raspberrypi/rpi23-linux-4.9.config

@@ -191,7 +191,13 @@ CONFIG_REGULATOR=y
 CONFIG_MEDIA_SUPPORT=y
 CONFIG_MEDIA_CAMERA_SUPPORT=y
 CONFIG_V4L_PLATFORM_DRIVERS=y
+CONFIG_VIDEO_DEV=m
+CONFIG_VIDEO_V4L2=y
 CONFIG_VIDEO_BCM2835=y
+CONFIG_MEDIA_USB_SUPPORT=y
+CONFIG_V4L_PLATFORM_DRIVERS=y
+CONFIG_V4L_MEM2MEM_DRIVERS=y
+CONFIG_V4L_TEST_DRIVERS=y
 CONFIG_FB=y
 CONFIG_FIRMWARE_EDID=y
 CONFIG_FB_BCM2708=y
@@ -210,6 +216,12 @@ CONFIG_SND_BCM2835=y
 # CONFIG_SND_SPI is not set
 CONFIG_HIDRAW=y
 CONFIG_UHID=y
+
+CONFIG_SND_ARM=y
+CONFIG_SND_SPI=y
+CONFIG_SND_USB=y
+CONFIG_SND_USB_AUDIO=y
+
 CONFIG_HID_MULTITOUCH=y
 CONFIG_USB=y
 CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
@@ -268,3 +280,72 @@ CONFIG_ARM_CRYPTO=y
 CONFIG_CRYPTO_SHA1_ARM_NEON=y
 CONFIG_CRYPTO_SHA512_ARM=y
 CONFIG_CRYPTO_AES_ARM_BS=y
+
+#
+# Webcam devices
+#
+CONFIG_USB_VIDEO_CLASS=y
+CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y
+CONFIG_USB_GSPCA=m
+CONFIG_USB_M5602=m
+CONFIG_USB_STV06XX=m
+CONFIG_USB_GL860=m
+CONFIG_USB_GSPCA_BENQ=m
+CONFIG_USB_GSPCA_CONEX=m
+CONFIG_USB_GSPCA_CPIA1=m
+CONFIG_USB_GSPCA_ETOMS=m
+CONFIG_USB_GSPCA_FINEPIX=m
+CONFIG_USB_GSPCA_JEILINJ=m
+CONFIG_USB_GSPCA_JL2005BCD=m
+CONFIG_USB_GSPCA_KINECT=m
+CONFIG_USB_GSPCA_KONICA=m
+CONFIG_USB_GSPCA_MARS=m
+CONFIG_USB_GSPCA_MR97310A=m
+CONFIG_USB_GSPCA_NW80X=m
+CONFIG_USB_GSPCA_OV519=m
+CONFIG_USB_GSPCA_OV534=m
+CONFIG_USB_GSPCA_OV534_9=m
+CONFIG_USB_GSPCA_PAC207=m
+CONFIG_USB_GSPCA_PAC7302=m
+CONFIG_USB_GSPCA_PAC7311=m
+CONFIG_USB_GSPCA_SE401=m
+CONFIG_USB_GSPCA_SN9C2028=m
+CONFIG_USB_GSPCA_SN9C20X=m
+CONFIG_USB_GSPCA_SONIXB=m
+CONFIG_USB_GSPCA_SONIXJ=m
+CONFIG_USB_GSPCA_SPCA500=m
+CONFIG_USB_GSPCA_SPCA501=m
+CONFIG_USB_GSPCA_SPCA505=m
+CONFIG_USB_GSPCA_SPCA506=m
+CONFIG_USB_GSPCA_SPCA508=m
+CONFIG_USB_GSPCA_SPCA561=m
+CONFIG_USB_GSPCA_SPCA1528=m
+CONFIG_USB_GSPCA_SQ905=m
+CONFIG_USB_GSPCA_SQ905C=m
+CONFIG_USB_GSPCA_SQ930X=m
+CONFIG_USB_GSPCA_STK014=m
+CONFIG_USB_GSPCA_STK1135=m
+CONFIG_USB_GSPCA_STV0680=m
+CONFIG_USB_GSPCA_SUNPLUS=m
+CONFIG_USB_GSPCA_T613=m
+CONFIG_USB_GSPCA_TOPRO=m
+CONFIG_USB_GSPCA_TV8532=m
+CONFIG_USB_GSPCA_VC032X=m
+CONFIG_USB_GSPCA_VICAM=m
+CONFIG_USB_GSPCA_XIRLINK_CIT=m
+CONFIG_USB_GSPCA_ZC3XX=m
+CONFIG_USB_PWC=m
+# CONFIG_USB_PWC_DEBUG is not set
+CONFIG_USB_PWC_INPUT_EVDEV=y
+CONFIG_VIDEO_CPIA2=m
+CONFIG_USB_ZR364XX=m
+CONFIG_USB_STKWEBCAM=m
+CONFIG_USB_S2255=m
+CONFIG_USB_SN9C102=m
+CONFIG_VIDEO_USBTV=m
+
+CONFIG_USB_G_WEBCAM=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_CONFIGFS=y
+CONFIG_USB_CONFIGFS_F_UVC=y
+CONFIG_USB_F_UVC=m

configs/raspberrypi3_wpe_defconfig

@@ -24,12 +24,17 @@ BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/raspberrypi/rpi23-linux-4.9.config"
 BR2_LINUX_KERNEL_LZ4=y
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2710-rpi-3-b bcm2710-rpi-3-b-plus bcm2710-rpi-cm3"
+BR2_PACKAGE_LIBEVENT=y
+BR2_PACKAGE_LIBVPX=y
 BR2_PACKAGE_BUSYBOX_SMP=y
 BR2_PACKAGE_GSTREAMER1=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_APP=y
+BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VIDEORATE=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VIDEOCONVERT=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_GIO=y
+BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_ALSA=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_OPUS=y
+BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_V4L2=y
 BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_AUDIOFX=y
 BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_AUDIOPARSERS=y
 BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_AUTODETECT=y

configs/raspberrypi3_wpe_ml_defconfig

@@ -24,13 +24,18 @@ BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/raspberrypi/rpi23-linux-4.9.config"
 BR2_LINUX_KERNEL_LZ4=y
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="bcm2710-rpi-3-b bcm2710-rpi-3-b-plus bcm2710-rpi-cm3"
+BR2_PACKAGE_LIBEVENT=y
+BR2_PACKAGE_LIBVPX=y
 BR2_PACKAGE_BUSYBOX_SMP=y
 BR2_PACKAGE_GSTREAMER1=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_APP=y
+BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_ENCODING=y
+BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VIDEORATE=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_VIDEOCONVERT=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_GIO=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_ALSA=y
 BR2_PACKAGE_GST1_PLUGINS_BASE_PLUGIN_OPUS=y
+BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_V4L2=y
 BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_AUDIOFX=y
 BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_AUDIOPARSERS=y
 BR2_PACKAGE_GST1_PLUGINS_GOOD_PLUGIN_AUTODETECT=y