Changes between Initial Version and Version 1 of buildroot/gstreamer

Timestamp:

02/27/2020 09:54:20 PM (6 years ago)

Author:

Tim Harvey

Comment:

initial page

buildroot/gstreamer

@@ +1 @@
+= Introduction to GStreamer in Buildroot
+
+An embedded solution may require a custom multimedia streaming solution. Buildroot and GStreamer makes for an efficient lightweight solution. 
+
+This guide will walk you through the necessary steps to create a bootable image containing the ability to:
+- capture/playback/encode/decode Video
+- capture/playback/encode/decode Audio
+
+= Building the demo image
+
+== Recommended hardware
+
+- Ventana board with video input and video output (ie GW5404)
+- 1080p HDMI monitor
+- Mini HDMI cable to HDMI (for connecting the board and monitor together)
+- Power cables
+
+
+== Building
+Procedure:
+{{{#!bash
+# clone buildroot
+git clone https://github.com/buildroot/buildroot.git
+cd buildroot
+# fetch and apply patch that adds ventana defconfig files
+wget http://trac.gateworks.com/raw-attachment/wiki/buildroot/gstreamer/0001-configs-add-various-Gateworks-Ventana-configs.patch
+wget http://trac.gateworks.com/raw-attachment/wiki/buildroot/gstreamer/0002-board-gateworks-add-overlay-for-Gateworks-Ventana-bo.patch
+git am *.patch
+# build the gwventana-gst image
+make distclean
+make imx6-gwventana-gst_defconfig
+make
+ls output/images/
+}}}
+
+The patch adds the following:
+ * board/gateworks/ventana/rootfs_overlay/bin/media-ctl-setup - media-ctl helper script for configuring video capture devices
+ * configs/imx6-gwventana-gst_defconfig - defconfig for GStreamer based image
+
+You can use the following filesystem images:
+ * output/images/rootfs.ubi for 2K page size flash geometries (256MB flash or newer 2GiB flash parts)
+  - if you are looking for a ubi image suitable for 4K page size flash geometries (the Micron 2GiB part) change the following via menuconfig:
+{{{#!bash
+BR2_TARGET_ROOTFS_UBIFS_LEBSIZE=0x3e000
+BR2_TARGET_ROOTFS_UBIFS_MINIOSIZE=0x1000
+BR2_TARGET_ROOTFS_UBIFS_MAXLEBCNT=8192
+BR2_TARGET_ROOTFS_UBI_PEBSIZE=0x40000
+BR2_TARGET_ROOTFS_UBI_SUBSIZE=0
+}}}
+ * output/images/rootfs.tar - refer to [wiki:/linux/blockdev this page] to create a bootable block storage device using the created tarball
+ * output/images/sdcard.img - disk image suitable for copying to a removalbe block storage device (see [wiki:/linux/blockdev])
+
+
+= Running the Demos
+
+Login as "root"
+
+Example Demos:
+ * Video Display of test pattern:
+{{{#!bash
+gst-launch-1.0 videotestsrc ! autovideosink
+}}}
+ * Capture, encode, and stream Analog Video
+{{{#!bash
+media-ctl-setup adv7180 > setup
+. ./setup
+gst-launch-1.0 v4l2src device=$DEVICE ! \
+        $GST_CONVERT output-io-mode=dmabuf-import ! \
+        v4l2h264enc output-io-mode=dmabuf-import ! \
+        rtph264pay ! udpsink host=$SERVER port=5000
+}}}
+  - view on $SERVER with:
+{{{#!bash
+gst-launch-1.0 udpsrc port=5000 caps=application/x-rtp,payload=96 ! rtph264depay ! decodebin ! autovideosink
+}}}
+ * Capture, encode, save Analog audio:
+{{{#!bash
+amixer -c 1 sset "Capture Mux" LINE_IN # LINE_IN vs MIC_IN, default MIC_IN
+amixer -c 1 sset "Capture" 8 # 0-15, default 0
+gst-launch-1.0 alsasrc device="sysdefault:CARD=sgtl5000audio" ! audioconvert ! filesink location=file.mp3
+}}}
+ * Decode and Playback audio to Analog out:
+{{{#!bash
+gst-launch-1.0 filesrc location=file.mp3 ! mpegaudioparse ! mpg123audiodec ! alsasink device="sysdefault:CARD=sgtl5000audio"
+}}}
+ * Capture, encode, and stream Analog Audio:
+{{{#!bash
+amixer -c 1 sset "Capture Mux" LINE_IN # LINE_IN vs MIC_IN, default MIC_IN
+amixer -c 1 sset "Capture" 8 # 0-15, default 0
+gst-launch-1.0 -v alsasrc device="sysdefault:CARD=sgtl5000audio" ! \
+          audioconvert ! \
+          lamemp3enc ! \
+          rtpmpapay ! udpsink host=$SERVER port=5000
+}}}
+  - play on $SERVER with:
+{{{#!bash
+gst-launch-1.0 udpsrc port=5000 caps=application/x-rtp,payload=96 ! rtpmpadepay ! decodebin ! autoaudiosink
+}}}
+ * Stream, decode, playback audio:
+{{{#!bash
+gst-launch-1.0 playbin uri=http://server/myfavoritesong.mp3
+}}}
+
+= Conclusion
+This concludes how to build and install the GStreamer demo in buildroot. Using "make menuconfig" many additional applications and gstreamer plugins can be built into buildroot for other needs.