package gst /* #cgo pkg-config: gstreamer-1.0 gstreamer-app-1.0 #include "gst.h" */ import "C" import ( "fmt" "sync" "time" "unsafe" "n.eko.moe/neko/internal/types" ) /* apt-get install \ libgstreamer1.0-0 \ gstreamer1.0-plugins-base \ gstreamer1.0-plugins-good \ gstreamer1.0-plugins-bad \ gstreamer1.0-plugins-ugly\ gstreamer1.0-libav \ gstreamer1.0-doc \ gstreamer1.0-tools \ gstreamer1.0-x \ gstreamer1.0-alsa \ gstreamer1.0-pulseaudio gst-inspect-1.0 --version gst-inspect-1.0 plugin gst-launch-1.0 ximagesrc show-pointer=true use-damage=false ! video/x-raw,framerate=30/1 ! videoconvert ! queue ! vp8enc error-resilient=partitions keyframe-max-dist=10 auto-alt-ref=true cpu-used=5 deadline=1 ! autovideosink gst-launch-1.0 pulsesrc ! audioconvert ! opusenc ! autoaudiosink */ // Pipeline is a wrapper for a GStreamer Pipeline type Pipeline struct { Pipeline *C.GstElement Sample chan types.Sample CodecName string ClockRate float32 Src string id int } var pipelines = make(map[int]*Pipeline) var pipelinesLock sync.Mutex var registry *C.GstRegistry const ( videoClockRate = 90000 audioClockRate = 48000 pcmClockRate = 8000 videoSrc = "ximagesrc display-name=%s show-pointer=true use-damage=false ! video/x-raw ! videoconvert ! queue ! " audioSrc = "pulsesrc device=%s ! audio/x-raw,channels=2 ! audioconvert ! " ) func init() { C.gstreamer_init() registry = C.gst_registry_get() } // CreateRTMPPipeline creates a GStreamer Pipeline func CreateRTMPPipeline(pipelineDevice string, pipelineDisplay string, pipelineSrc string, pipelineRTMP string) (*Pipeline, error) { video := fmt.Sprintf(videoSrc, pipelineDisplay) audio := fmt.Sprintf(audioSrc, pipelineDevice) var pipelineStr string if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc, pipelineRTMP, pipelineDevice, pipelineDisplay) } else { pipelineStr = fmt.Sprintf("flvmux name=mux ! rtmpsink location='%s live=1' %s audio/x-raw,channels=2 ! audioconvert ! voaacenc ! mux. %s x264enc bframes=0 key-int-max=60 byte-stream=true tune=zerolatency speed-preset=veryfast ! mux.", pipelineRTMP, audio, video) } return CreatePipeline(pipelineStr, "", 0) } // CreateAppPipeline creates a GStreamer Pipeline func CreateAppPipeline(codecName string, pipelineDevice string, pipelineSrc string, bitrate string) (*Pipeline, error) { pipelineStr := " ! appsink name=appsink" var clockRate float32 switch codecName { case "VP8": // https://gstreamer.freedesktop.org/documentation/vpx/vp8enc.html?gi-language=c // gstreamer1.0-plugins-good // vp8enc error-resilient=partitions keyframe-max-dist=10 auto-alt-ref=true cpu-used=5 deadline=1 if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil { return nil, err } clockRate = videoClockRate if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { pipelineStr = fmt.Sprintf(videoSrc+"vp8enc cpu-used=-5 threads=4 deadline=1 error-resilient=partitions keyframe-max-dist=30 auto-alt-ref=true"+pipelineStr, pipelineDevice) } case "VP9": // https://gstreamer.freedesktop.org/documentation/vpx/vp9enc.html?gi-language=c // gstreamer1.0-plugins-good // vp9enc if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil { return nil, err } clockRate = videoClockRate // Causes panic! not sure why... if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { pipelineStr = fmt.Sprintf(videoSrc+"vp9enc"+pipelineStr, pipelineDevice) } case "H264": // https://gstreamer.freedesktop.org/documentation/openh264/openh264enc.html?gi-language=c#openh264enc // gstreamer1.0-plugins-bad // openh264enc multi-thread=4 complexity=high bitrate=3072000 max-bitrate=4096000 if err := CheckPlugins([]string{"ximagesrc"}); err != nil { return nil, err } clockRate = videoClockRate if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { var h264Str string h264Str = "openh264enc multi-thread=4 complexity=high bitrate=3072000 max-bitrate=4096000 ! video/x-h264,stream-format=byte-stream" if bitrate != "" { h264Str = "openh264enc multi-thread=4 complexity=high bitrate=" + bitrate + "000 max-bitrate=" + bitrate + "999 ! video/x-h264,stream-format=byte-stream" } // https://gstreamer.freedesktop.org/documentation/x264/index.html?gi-language=c // gstreamer1.0-plugins-ugly // video/x-raw,format=I420 ! x264enc bframes=0 key-int-max=60 byte-stream=true tune=zerolatency speed-preset=veryfast ! video/x-h264,stream-format=byte-stream if err := CheckPlugins([]string{"openh264"}); err != nil { h264Str = "video/x-raw,format=I420 ! x264enc threads=4 byte-stream=true tune=zerolatency speed-preset=veryfast ! video/x-h264,stream-format=byte-stream" if bitrate != "" { h264Str = "video/x-raw,format=I420 ! x264enc threads=4 bitrate=" + bitrate + " byte-stream=true tune=zerolatency speed-preset=veryfast ! video/x-h264,stream-format=byte-stream" } if err := CheckPlugins([]string{"x264"}); err != nil { return nil, err } } pipelineStr = fmt.Sprintf(videoSrc+h264Str+pipelineStr, pipelineDevice) } case "Opus": // https://gstreamer.freedesktop.org/documentation/opus/opusenc.html // gstreamer1.0-plugins-base // opusenc if err := CheckPlugins([]string{"pulseaudio", "opus"}); err != nil { return nil, err } clockRate = audioClockRate if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { pipelineStr = fmt.Sprintf(audioSrc+"opusenc"+pipelineStr, pipelineDevice) } case "G722": // https://gstreamer.freedesktop.org/documentation/libav/avenc_g722.html?gi-language=c // gstreamer1.0-libav // avenc_g722 if err := CheckPlugins([]string{"pulseaudio", "libav"}); err != nil { return nil, err } clockRate = audioClockRate if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { pipelineStr = fmt.Sprintf(audioSrc+"avenc_g722"+pipelineStr, pipelineDevice) } case "PCMU": // https://gstreamer.freedesktop.org/documentation/mulaw/mulawenc.html?gi-language=c // gstreamer1.0-plugins-good // audio/x-raw, rate=8000 ! mulawenc if err := CheckPlugins([]string{"pulseaudio", "mulaw"}); err != nil { return nil, err } clockRate = pcmClockRate if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! mulawenc"+pipelineStr, pipelineDevice) } case "PCMA": // https://gstreamer.freedesktop.org/documentation/alaw/alawenc.html?gi-language=c // gstreamer1.0-plugins-good // audio/x-raw, rate=8000 ! alawenc if err := CheckPlugins([]string{"pulseaudio", "alaw"}); err != nil { return nil, err } clockRate = pcmClockRate if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice) } else { pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! alawenc"+pipelineStr, pipelineDevice) } default: return nil, fmt.Errorf("unknown codec %s", codecName) } return CreatePipeline(pipelineStr, codecName, clockRate) } // CreatePipeline creates a GStreamer Pipeline func CreatePipeline(pipelineStr string, codecName string, clockRate float32) (*Pipeline, error) { pipelineStrUnsafe := C.CString(pipelineStr) defer C.free(unsafe.Pointer(pipelineStrUnsafe)) pipelinesLock.Lock() defer pipelinesLock.Unlock() p := &Pipeline{ Pipeline: C.gstreamer_send_create_pipeline(pipelineStrUnsafe), Sample: make(chan types.Sample), CodecName: codecName, ClockRate: clockRate, Src: pipelineStr, id: len(pipelines), } pipelines[p.id] = p return p, nil } // Start starts the GStreamer Pipeline func (p *Pipeline) Start() { C.gstreamer_send_start_pipeline(p.Pipeline, C.int(p.id)) } // Play starts the GStreamer Pipeline func (p *Pipeline) Play() { C.gstreamer_send_play_pipeline(p.Pipeline) } // Stop stops the GStreamer Pipeline func (p *Pipeline) Stop() { C.gstreamer_send_stop_pipeline(p.Pipeline) } // gst-inspect-1.0 func CheckPlugins(plugins []string) error { var plugin *C.GstPlugin for _, pluginstr := range plugins { plugincstr := C.CString(pluginstr) plugin = C.gst_registry_find_plugin(registry, plugincstr) C.free(unsafe.Pointer(plugincstr)) if plugin == nil { return fmt.Errorf("required gstreamer plugin %s not found", pluginstr) } } return nil } //export goHandlePipelineBuffer func goHandlePipelineBuffer(buffer unsafe.Pointer, bufferLen C.int, duration C.int, pipelineID C.int) { pipelinesLock.Lock() pipeline, ok := pipelines[int(pipelineID)] pipelinesLock.Unlock() if ok { pipeline.Sample <- types.Sample{Data: C.GoBytes(buffer, bufferLen), Timestamp: time.Now(), Duration: time.Duration(duration)} } else { fmt.Printf("discarding buffer, no pipeline with id %d", int(pipelineID)) } C.free(buffer) }