package gst /* #cgo pkg-config: gstreamer-1.0 gstreamer-app-1.0 #include "gst.h" */ import "C" import ( "fmt" "sync" "unsafe" "github.com/pion/webrtc/v2" "demodesk/neko/internal/types" ) // Pipeline is a wrapper for a GStreamer Pipeline type Pipeline struct { Pipeline *C.GstElement Sample chan types.Sample 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=false use-damage=false ! video/x-raw ! videoconvert ! queue ! " audioSrc = "pulsesrc device=%s ! audio/x-raw,channels=2 ! audioconvert ! " appSink = " ! appsink name=appsink" ) 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) (*Pipeline, error) { var clockRate float32 var pipelineStr string switch codecName { case webrtc.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 pipelineStr = fmt.Sprintf(videoSrc + "vp8enc cpu-used=8 threads=2 deadline=1 error-resilient=partitions keyframe-max-dist=10 auto-alt-ref=true" + appSink, pipelineDevice) case webrtc.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 pipelineStr = fmt.Sprintf(videoSrc + "vp9enc" + appSink, pipelineDevice) case webrtc.H264: if err := CheckPlugins([]string{"ximagesrc"}); err != nil { return nil, err } var err error // 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{"openh264"}); err == nil { clockRate = videoClockRate pipelineStr = fmt.Sprintf(videoSrc + "openh264enc multi-thread=4 complexity=high bitrate=3072000 max-bitrate=4096000 ! video/x-h264,stream-format=byte-stream" + appSink, pipelineDevice) break } // 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{"x264"}); err == nil { clockRate = videoClockRate pipelineStr = fmt.Sprintf(videoSrc + "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" + appSink, pipelineDevice) break } return nil, err case webrtc.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 pipelineStr = fmt.Sprintf(audioSrc + "opusenc" + appSink, pipelineDevice) case webrtc.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 pipelineStr = fmt.Sprintf(audioSrc + "avenc_g722" + appSink, pipelineDevice) case webrtc.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 pipelineStr = fmt.Sprintf(audioSrc + "audio/x-raw, rate=8000 ! mulawenc" + appSink, pipelineDevice) case webrtc.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 pipelineStr = fmt.Sprintf(audioSrc + "audio/x-raw, rate=8000 ! alawenc" + appSink, pipelineDevice) default: return nil, fmt.Errorf("unknown codec %s", codecName) } if pipelineSrc != "" { pipelineStr = fmt.Sprintf(pipelineSrc + appSink, pipelineDevice) } return CreatePipeline(pipelineStr, clockRate) } // CreatePipeline creates a GStreamer Pipeline func CreatePipeline(pipelineStr string, clockRate float32) (*Pipeline, error) { pipelineStrUnsafe := C.CString(pipelineStr) defer C.free(unsafe.Pointer(pipelineStrUnsafe)) pipelinesLock.Lock() defer pipelinesLock.Unlock() var gstPipeline *C.GstElement var gstError *C.GError gstPipeline = C.gst_parse_launch(pipelineStrUnsafe, &gstError) defer C.g_error_free(gstError) if gstError != nil { return nil, fmt.Errorf("(pipeline error) %s", C.GoString(gstError.message)) } p := &Pipeline{ Pipeline: gstPipeline, Sample: make(chan types.Sample), 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 { samples := uint32(pipeline.ClockRate * (float32(duration) / 1000000000)) pipeline.Sample <- types.Sample{Data: C.GoBytes(buffer, bufferLen), Samples: samples} } else { fmt.Printf("discarding buffer, no pipeline with id %d", int(pipelineID)) } C.free(buffer) }