neko/server/internal/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"
"sync"
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"time"
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"unsafe"
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"n.eko.moe/neko/internal/types"
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)
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/*
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 \
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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
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*/
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// Pipeline is a wrapper for a GStreamer Pipeline
type Pipeline struct {
Pipeline *C.GstElement
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Sample chan types.Sample
CodecName string
ClockRate float32
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Src string
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id int
}
var pipelines = make(map[int]*Pipeline)
var pipelinesLock sync.Mutex
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var registry *C.GstRegistry
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const (
videoClockRate = 90000
audioClockRate = 48000
pcmClockRate = 8000
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videoSrc = "ximagesrc display-name=%s show-pointer=true use-damage=false ! video/x-raw ! videoconvert ! queue ! "
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audioSrc = "pulsesrc device=%s ! audio/x-raw,channels=2 ! audioconvert ! "
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)
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func init() {
C.gstreamer_init()
registry = C.gst_registry_get()
}
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// CreateRTMPPipeline creates a GStreamer Pipeline
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func CreateRTMPPipeline(pipelineDevice string, pipelineDisplay string, pipelineSrc string, pipelineRTMP string) (*Pipeline, error) {
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video := fmt.Sprintf(videoSrc, pipelineDisplay)
audio := fmt.Sprintf(audioSrc, pipelineDevice)
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var pipelineStr string
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc, pipelineRTMP, pipelineDevice, pipelineDisplay)
} else {
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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, "", 0)
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}
// CreateAppPipeline creates a GStreamer Pipeline
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func CreateAppPipeline(codecName string, pipelineDevice string, pipelineSrc string, bitrate string) (*Pipeline, error) {
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pipelineStr := " ! appsink name=appsink"
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var clockRate float32
switch codecName {
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case "VP8":
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// https://gstreamer.freedesktop.org/documentation/vpx/vp8enc.html?gi-language=c
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// gstreamer1.0-plugins-good
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// 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 {
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return nil, err
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}
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clockRate = videoClockRate
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
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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)
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}
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case "VP9":
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// https://gstreamer.freedesktop.org/documentation/vpx/vp9enc.html?gi-language=c
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// gstreamer1.0-plugins-good
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// vp9enc
if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil {
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return nil, err
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}
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clockRate = videoClockRate
// Causes panic! not sure why...
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(videoSrc+"vp9enc"+pipelineStr, pipelineDevice)
}
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case "H264":
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// 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 {
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return nil, err
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}
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clockRate = videoClockRate
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
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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"
}
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// 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 {
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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"
}
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if err := CheckPlugins([]string{"x264"}); err != nil {
return nil, err
}
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}
pipelineStr = fmt.Sprintf(videoSrc+h264Str+pipelineStr, pipelineDevice)
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}
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case "Opus":
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// https://gstreamer.freedesktop.org/documentation/opus/opusenc.html
// gstreamer1.0-plugins-base
// opusenc
if err := CheckPlugins([]string{"pulseaudio", "opus"}); err != nil {
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return nil, err
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}
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clockRate = audioClockRate
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"opusenc"+pipelineStr, pipelineDevice)
}
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case "G722":
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// 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 {
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return nil, err
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}
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clockRate = audioClockRate
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"avenc_g722"+pipelineStr, pipelineDevice)
}
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case "PCMU":
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// 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 {
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return nil, err
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}
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clockRate = pcmClockRate
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! mulawenc"+pipelineStr, pipelineDevice)
}
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case "PCMA":
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// 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 {
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return nil, err
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}
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clockRate = pcmClockRate
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! alawenc"+pipelineStr, pipelineDevice)
}
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default:
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return nil, fmt.Errorf("unknown codec %s", codecName)
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}
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return CreatePipeline(pipelineStr, codecName, clockRate)
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}
// CreatePipeline creates a GStreamer Pipeline
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func CreatePipeline(pipelineStr string, codecName string, clockRate float32) (*Pipeline, error) {
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pipelineStrUnsafe := C.CString(pipelineStr)
defer C.free(unsafe.Pointer(pipelineStrUnsafe))
pipelinesLock.Lock()
defer pipelinesLock.Unlock()
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p := &Pipeline{
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Pipeline: C.gstreamer_send_create_pipeline(pipelineStrUnsafe),
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Sample: make(chan types.Sample),
CodecName: codecName,
ClockRate: clockRate,
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Src: pipelineStr,
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id: len(pipelines),
}
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pipelines[p.id] = p
return p, nil
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}
// Start starts the GStreamer Pipeline
func (p *Pipeline) Start() {
C.gstreamer_send_start_pipeline(p.Pipeline, C.int(p.id))
}
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// Play starts the GStreamer Pipeline
func (p *Pipeline) Play() {
C.gstreamer_send_play_pipeline(p.Pipeline)
}
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// Stop stops the GStreamer Pipeline
func (p *Pipeline) Stop() {
C.gstreamer_send_stop_pipeline(p.Pipeline)
}
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// gst-inspect-1.0
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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 {
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return fmt.Errorf("required gstreamer plugin %s not found", pluginstr)
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}
}
return nil
}
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//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 {
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pipeline.Sample <- types.Sample{Data: C.GoBytes(buffer, bufferLen), Timestamp: time.Now(), Duration: time.Duration(duration)}
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} else {
fmt.Printf("discarding buffer, no pipeline with id %d", int(pipelineID))
}
C.free(buffer)
}