neko/internal/capture/gst/gst.go

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package gst
/*
#cgo pkg-config: gstreamer-1.0 gstreamer-app-1.0
#include "gst.h"
*/
import "C"
import (
"fmt"
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"time"
"sync"
"unsafe"
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"demodesk/neko/internal/types"
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"demodesk/neko/internal/types/codec"
)
// Pipeline is a wrapper for a GStreamer Pipeline
type Pipeline struct {
Pipeline *C.GstElement
Sample chan types.Sample
Src string
id int
}
var pipelines = make(map[int]*Pipeline)
var pipelinesLock sync.Mutex
var registry *C.GstRegistry
const (
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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)
}
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return CreatePipeline(pipelineStr)
}
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// CreateJPEGPipeline creates a GStreamer Pipeline
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func CreateJPEGPipeline(pipelineDisplay string, pipelineSrc string, rate string, quality string) (*Pipeline, error) {
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var pipelineStr string
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc, pipelineDisplay)
} else {
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pipelineStr = fmt.Sprintf("ximagesrc display-name=%s show-pointer=true use-damage=false ! videoconvert ! videoscale ! videorate ! video/x-raw,framerate=%s ! jpegenc quality=%s" + appSink, pipelineDisplay, rate, quality)
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}
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return CreatePipeline(pipelineStr)
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}
// CreateAppPipeline creates a GStreamer Pipeline
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func CreateAppPipeline(codecRTP codec.RTPCodec, pipelineDevice string, pipelineSrc string) (*Pipeline, error) {
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var pipelineStr string
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switch codecRTP.Name {
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case "vp8":
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// https://gstreamer.freedesktop.org/documentation/vpx/vp8enc.html
// gstreamer1.0-plugins-good
if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil {
return nil, err
}
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pipelineStr = fmt.Sprintf(videoSrc + "vp8enc cpu-used=16 threads=4 deadline=1 error-resilient=partitions keyframe-max-dist=15 static-threshold=20" + appSink, pipelineDevice)
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case "vp9":
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// https://gstreamer.freedesktop.org/documentation/vpx/vp9enc.html
// gstreamer1.0-plugins-good
if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil {
return nil, err
}
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pipelineStr = fmt.Sprintf(videoSrc + "vp9enc cpu-used=16 threads=4 deadline=1 keyframe-max-dist=15 static-threshold=20" + appSink, pipelineDevice)
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case "h264":
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var err error
if err = CheckPlugins([]string{"ximagesrc"}); err != nil {
return nil, err
}
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// https://gstreamer.freedesktop.org/documentation/x264/index.html
// gstreamer1.0-plugins-ugly
if err = CheckPlugins([]string{"x264"}); err == nil {
pipelineStr = fmt.Sprintf(videoSrc + "video/x-raw,format=I420 ! x264enc threads=4 bitrate=4096 key-int-max=15 byte-stream=true tune=zerolatency speed-preset=veryfast ! video/x-h264,stream-format=byte-stream" + appSink, pipelineDevice)
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break
}
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// https://gstreamer.freedesktop.org/documentation/openh264/openh264enc.html
// gstreamer1.0-plugins-bad
if err = CheckPlugins([]string{"openh264"}); err == nil {
pipelineStr = fmt.Sprintf(videoSrc + "openh264enc multi-thread=4 complexity=high bitrate=3072000 max-bitrate=4096000 ! video/x-h264,stream-format=byte-stream" + appSink, pipelineDevice)
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break
}
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return nil, err
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case "opus":
// https://gstreamer.freedesktop.org/documentation/opus/opusenc.html
// gstreamer1.0-plugins-base
if err := CheckPlugins([]string{"pulseaudio", "opus"}); err != nil {
return nil, err
}
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pipelineStr = fmt.Sprintf(audioSrc + "opusenc bitrate=128000" + appSink, pipelineDevice)
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case "g722":
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// https://gstreamer.freedesktop.org/documentation/libav/avenc_g722.html
// gstreamer1.0-libav
if err := CheckPlugins([]string{"pulseaudio", "libav"}); err != nil {
return nil, err
}
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pipelineStr = fmt.Sprintf(audioSrc + "avenc_g722" + appSink, pipelineDevice)
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case "pcmu":
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// https://gstreamer.freedesktop.org/documentation/mulaw/mulawenc.html
// gstreamer1.0-plugins-good
if err := CheckPlugins([]string{"pulseaudio", "mulaw"}); err != nil {
return nil, err
}
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pipelineStr = fmt.Sprintf(audioSrc + "audio/x-raw, rate=8000 ! mulawenc" + appSink, pipelineDevice)
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case "pcma":
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// https://gstreamer.freedesktop.org/documentation/alaw/alawenc.html
// gstreamer1.0-plugins-good
if err := CheckPlugins([]string{"pulseaudio", "alaw"}); err != nil {
return nil, err
}
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pipelineStr = fmt.Sprintf(audioSrc + "audio/x-raw, rate=8000 ! alawenc" + appSink, pipelineDevice)
default:
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return nil, fmt.Errorf("unknown codec %s", codecRTP.Name)
}
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if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc + appSink, pipelineDevice)
}
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return CreatePipeline(pipelineStr)
}
// CreatePipeline creates a GStreamer Pipeline
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func CreatePipeline(pipelineStr string) (*Pipeline, error) {
pipelineStrUnsafe := C.CString(pipelineStr)
defer C.free(unsafe.Pointer(pipelineStrUnsafe))
pipelinesLock.Lock()
defer pipelinesLock.Unlock()
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var gstPipeline *C.GstElement
var gstError *C.GError
gstPipeline = C.gst_parse_launch(pipelineStrUnsafe, &gstError)
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if gstError != nil {
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defer C.g_error_free(gstError)
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return nil, fmt.Errorf("(pipeline error) %s", C.GoString(gstError.message))
}
p := &Pipeline{
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Pipeline: gstPipeline,
Sample: make(chan types.Sample),
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) {
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defer C.free(buffer)
pipelinesLock.Lock()
pipeline, ok := pipelines[int(pipelineID)]
pipelinesLock.Unlock()
if ok {
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pipeline.Sample <- types.Sample{
Data: C.GoBytes(buffer, bufferLen),
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Duration: time.Duration(duration),
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}
} else {
fmt.Printf("discarding buffer, no pipeline with id %d", int(pipelineID))
}
}