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// Copyright 2022, Chef. All rights reserved.
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// https://github.com/q191201771/lal
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//
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// Use of this source code is governed by a MIT-style license
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// that can be found in the License file.
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//
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// Author: Chef (191201771@qq.com)
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package remux
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// TODO(chef) 将gop_cache.go和gop_cache_mpegts.go的待完成项统一记录在这里
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// - GopCache 和 GopCacheMpegts 尽量统一
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// - 是否有必要单独存储帧，也即一个Gop的多个帧是一块内存，还是多块内存，从性能，功能，可读考虑
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// - GopCache中非gop功能（包括meta和header的缓存）考虑移动到其他地方
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type GopCacheMpegts struct {
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uniqueKey string
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gopNum int
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gopRing []GopMpegts
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gopRingFirst int
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gopRingLast int
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gopSize int
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}
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func NewGopCacheMpegts(uniqueKey string, gopNum int) *GopCacheMpegts {
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return &GopCacheMpegts{
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uniqueKey: uniqueKey,
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gopNum: gopNum,
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gopSize: gopNum + 1,
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gopRing: make([]GopMpegts, gopNum+1, gopNum+1),
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gopRingFirst: 0,
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gopRingLast: 0,
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}
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}
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// Feed
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//
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// @param b: 内部持有该内存块
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//
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func (gc *GopCacheMpegts) Feed(b []byte, boundary bool) {
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if gc.gopSize > 1 {
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if boundary {
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gc.feedNewGop(b)
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} else {
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gc.feedLastGop(b)
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}
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}
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}
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// GetGopCount 获取GOP数量，注意，最后一个可能是不完整的
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//
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func (gc *GopCacheMpegts) GetGopCount() int {
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return (gc.gopRingLast + gc.gopSize - gc.gopRingFirst) % gc.gopSize
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}
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func (gc *GopCacheMpegts) GetGopDataAt(pos int) [][]byte {
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if pos >= gc.GetGopCount() || pos < 0 {
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return nil
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}
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return gc.gopRing[(pos+gc.gopRingFirst)%gc.gopSize].data
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}
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func (gc *GopCacheMpegts) Clear() {
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gc.gopRingLast = 0
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gc.gopRingFirst = 0
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}
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// ---------------------------------------------------------------------------------------------------------------------
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// feedLastGop
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//
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// 往最后一个GOP元素追加一个msg
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// 注意，如果GopCache为空，则不缓存msg
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//
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func (gc *GopCacheMpegts) feedLastGop(b []byte) {
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if !gc.isGopRingEmpty() {
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gc.gopRing[(gc.gopRingLast-1+gc.gopSize)%gc.gopSize].Feed(b)
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}
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}
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// feedNewGop
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//
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// 生成一个最新的GOP元素，并往里追加一个msg
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//
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func (gc *GopCacheMpegts) feedNewGop(b []byte) {
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if gc.isGopRingFull() {
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gc.gopRingFirst = (gc.gopRingFirst + 1) % gc.gopSize
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}
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gc.gopRing[gc.gopRingLast].Clear()
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gc.gopRing[gc.gopRingLast].Feed(b)
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gc.gopRingLast = (gc.gopRingLast + 1) % gc.gopSize
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}
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func (gc *GopCacheMpegts) isGopRingFull() bool {
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return (gc.gopRingLast+1)%gc.gopSize == gc.gopRingFirst
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}
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func (gc *GopCacheMpegts) isGopRingEmpty() bool {
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return gc.gopRingFirst == gc.gopRingLast
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}
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// ---------------------------------------------------------------------------------------------------------------------
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// GopMpegts
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//
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// 单个Gop，包含多帧数据
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//
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type GopMpegts struct {
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data [][]byte
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}
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// Feed
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//
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// @param b: 内部持有`b`内存块
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//
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func (g *GopMpegts) Feed(b []byte) {
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g.data = append(g.data, b)
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}
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func (g *GopMpegts) Clear() {
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g.data = g.data[:0]
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}
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