261 lines
8.6 KiB
Go
261 lines
8.6 KiB
Go
package gst
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/*
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#cgo pkg-config: gstreamer-1.0 gstreamer-app-1.0
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#include "gst.h"
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*/
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import "C"
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import (
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"fmt"
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"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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/*
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apt-get install \
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libgstreamer1.0-0 \
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gstreamer1.0-plugins-base \
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gstreamer1.0-plugins-good \
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gstreamer1.0-plugins-bad \
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gstreamer1.0-plugins-ugly\
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gstreamer1.0-libav \
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gstreamer1.0-doc \
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gstreamer1.0-tools \
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gstreamer1.0-x \
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gstreamer1.0-alsa \
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gstreamer1.0-pulseaudio
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gst-inspect-1.0 --version
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gst-inspect-1.0 plugin
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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
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gst-launch-1.0 pulsesrc ! audioconvert ! opusenc ! autoaudiosink
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*/
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// Pipeline is a wrapper for a GStreamer Pipeline
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type Pipeline struct {
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Pipeline *C.GstElement
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Sample chan types.Sample
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CodecName string
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Src string
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id int
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}
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var pipelines = make(map[int]*Pipeline)
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var pipelinesLock sync.Mutex
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var registry *C.GstRegistry
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const (
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videoSrc = "ximagesrc display-name=%s show-pointer=true use-damage=false ! video/x-raw,framerate=%d/1 ! 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() {
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C.gstreamer_init()
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registry = C.gst_registry_get()
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}
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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, 25)
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audio := fmt.Sprintf(audioSrc, pipelineDevice)
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var pipelineStr string
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc, pipelineRTMP, pipelineDevice, pipelineDisplay)
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} 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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}
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return CreatePipeline(pipelineStr, "")
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}
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// CreateAppPipeline creates a GStreamer Pipeline
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func CreateAppPipeline(codecName string, pipelineDevice string, pipelineSrc string, fps int, bitrate uint) (*Pipeline, error) {
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pipelineStr := " ! appsink name=appsink"
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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
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if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil {
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return nil, err
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}
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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} else {
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pipelineStr = fmt.Sprintf(videoSrc+"vp8enc target-bitrate=%d cpu-used=4 end-usage=cbr threads=4 deadline=1 undershoot=95 buffer-size=%d buffer-initial-size=%d buffer-optimal-size=%d keyframe-max-dist=180 min-quantizer=3 max-quantizer=40"+pipelineStr, pipelineDevice, fps, bitrate*1000, bitrate*6, bitrate*4, bitrate*5)
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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
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if err := CheckPlugins([]string{"ximagesrc", "vpx"}); err != nil {
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return nil, err
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}
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// Causes panic! not sure why...
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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} else {
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pipelineStr = fmt.Sprintf(videoSrc+"vp9enc target-bitrate=%d cpu-used=-5 threads=4 deadline=1 keyframe-max-dist=30 auto-alt-ref=true"+pipelineStr, pipelineDevice, fps, bitrate*1000)
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}
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case "H264":
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if err := CheckPlugins([]string{"ximagesrc"}); err != nil {
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return nil, err
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}
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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break
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}
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// https://gstreamer.freedesktop.org/documentation/openh264/openh264enc.html?gi-language=c#openh264enc
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// gstreamer1.0-plugins-bad
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// openh264enc multi-thread=4 complexity=high bitrate=3072000 max-bitrate=4096000
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if err := CheckPlugins([]string{"openh264"}); err == nil {
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pipelineStr = fmt.Sprintf(videoSrc+"openh264enc multi-thread=4 complexity=high bitrate=%d max-bitrate=%d ! video/x-h264,stream-format=byte-stream"+pipelineStr, pipelineDevice, fps, bitrate*1000, (bitrate+1024)*1000)
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break
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}
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// https://gstreamer.freedesktop.org/documentation/x264/index.html?gi-language=c
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// gstreamer1.0-plugins-ugly
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// 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
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if err := CheckPlugins([]string{"x264"}); err != nil {
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return nil, err
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}
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vbvbuf := uint(1000)
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if bitrate > 1000 {
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vbvbuf = bitrate
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}
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pipelineStr = fmt.Sprintf(videoSrc+"video/x-raw,format=NV12 ! x264enc threads=4 bitrate=%d key-int-max=60 vbv-buf-capacity=%d byte-stream=true tune=zerolatency speed-preset=veryfast ! video/x-h264,stream-format=byte-stream"+pipelineStr, pipelineDevice, fps, bitrate, vbvbuf)
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case "Opus":
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// https://gstreamer.freedesktop.org/documentation/opus/opusenc.html
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// gstreamer1.0-plugins-base
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// opusenc
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if err := CheckPlugins([]string{"pulseaudio", "opus"}); err != nil {
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return nil, err
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}
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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} else {
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pipelineStr = fmt.Sprintf(audioSrc+"opusenc bitrate=%d"+pipelineStr, pipelineDevice, bitrate*1000)
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}
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case "G722":
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// https://gstreamer.freedesktop.org/documentation/libav/avenc_g722.html?gi-language=c
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// gstreamer1.0-libav
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// avenc_g722
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if err := CheckPlugins([]string{"pulseaudio", "libav"}); err != nil {
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return nil, err
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}
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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} else {
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pipelineStr = fmt.Sprintf(audioSrc+"avenc_g722 bitrate=%d"+pipelineStr, pipelineDevice, bitrate*1000)
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}
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case "PCMU":
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// https://gstreamer.freedesktop.org/documentation/mulaw/mulawenc.html?gi-language=c
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// gstreamer1.0-plugins-good
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// audio/x-raw, rate=8000 ! mulawenc
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if err := CheckPlugins([]string{"pulseaudio", "mulaw"}); err != nil {
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return nil, err
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}
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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} else {
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pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! mulawenc"+pipelineStr, pipelineDevice)
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}
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case "PCMA":
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// https://gstreamer.freedesktop.org/documentation/alaw/alawenc.html?gi-language=c
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// gstreamer1.0-plugins-good
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// audio/x-raw, rate=8000 ! alawenc
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if err := CheckPlugins([]string{"pulseaudio", "alaw"}); err != nil {
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return nil, err
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}
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if pipelineSrc != "" {
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pipelineStr = fmt.Sprintf(pipelineSrc+pipelineStr, pipelineDevice)
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} else {
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pipelineStr = fmt.Sprintf(audioSrc+"audio/x-raw, rate=8000 ! alawenc"+pipelineStr, pipelineDevice)
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}
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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)
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}
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// CreatePipeline creates a GStreamer Pipeline
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func CreatePipeline(pipelineStr string, codecName string) (*Pipeline, error) {
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pipelineStrUnsafe := C.CString(pipelineStr)
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defer C.free(unsafe.Pointer(pipelineStrUnsafe))
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pipelinesLock.Lock()
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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),
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CodecName: codecName,
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Src: pipelineStr,
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id: len(pipelines),
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}
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pipelines[p.id] = p
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return p, nil
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}
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// Start starts the GStreamer Pipeline
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func (p *Pipeline) Start() {
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C.gstreamer_send_start_pipeline(p.Pipeline, C.int(p.id))
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}
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// Play starts the GStreamer Pipeline
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func (p *Pipeline) Play() {
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C.gstreamer_send_play_pipeline(p.Pipeline)
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}
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// Stop stops the GStreamer Pipeline
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func (p *Pipeline) Stop() {
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C.gstreamer_send_stop_pipeline(p.Pipeline)
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}
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// gst-inspect-1.0
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func CheckPlugins(plugins []string) error {
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var plugin *C.GstPlugin
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for _, pluginstr := range plugins {
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plugincstr := C.CString(pluginstr)
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plugin = C.gst_registry_find_plugin(registry, plugincstr)
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C.free(unsafe.Pointer(plugincstr))
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if plugin == nil {
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return fmt.Errorf("required gstreamer plugin %s not found", pluginstr)
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}
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}
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return nil
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}
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//export goHandlePipelineBuffer
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func goHandlePipelineBuffer(buffer unsafe.Pointer, bufferLen C.int, duration C.int, pipelineID C.int) {
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pipelinesLock.Lock()
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pipeline, ok := pipelines[int(pipelineID)]
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pipelinesLock.Unlock()
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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 {
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fmt.Printf("discarding buffer, no pipeline with id %d", int(pipelineID))
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}
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C.free(buffer)
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}
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