neko/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"
"unsafe"
"github.com/pion/webrtc/v2"
"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 xid=%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) (*Pipeline, error) {
pipelineStr := " ! appsink name=appsink"
var clockRate float32
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
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(videoSrc+"vp8enc cpu-used=8 threads=2 deadline=1 error-resilient=partitions keyframe-max-dist=10 auto-alt-ref=true"+pipelineStr, 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
// Causes panic! not sure why...
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(videoSrc+"vp9enc"+pipelineStr, pipelineDevice)
}
case webrtc.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 {
pipelineStr = fmt.Sprintf(videoSrc+"openh264enc multi-thread=4 complexity=high bitrate=3072000 max-bitrate=4096000 ! video/x-h264,stream-format=byte-stream"+pipelineStr, pipelineDevice)
// 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 {
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"+pipelineStr, pipelineDevice)
if err := CheckPlugins([]string{"x264"}); err != nil {
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
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"opusenc"+pipelineStr, 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
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"avenc_g722"+pipelineStr, 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
if pipelineSrc != "" {
pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
} else {
pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! mulawenc"+pipelineStr, 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
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 {
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)
}