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Add spatial scalability support.
Only used as a last-resort fallback.
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1 changed files with 12 additions and 1 deletions
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@ -304,21 +304,32 @@ func (t *rtpDownTrack) GetMaxBitrate() (uint64, int, int) {
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return r, int(layer.sid), int(layer.tid)
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return r, int(layer.sid), int(layer.tid)
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}
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}
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// adjustLayer checks the allowable bitrate reported for a down track and
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// adjusts the layer by one step. It prefers temporal layers, and only
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// uses spatial layers as a last resort.
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func (t *rtpDownTrack) adjustLayer() {
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func (t *rtpDownTrack) adjustLayer() {
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max, _, _ := t.GetMaxBitrate()
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max, _, _ := t.GetMaxBitrate()
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r, _ := t.rate.Estimate()
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r, _ := t.rate.Estimate()
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rate := uint64(r) * 8
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rate := uint64(r) * 8
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if rate < max*7/8 {
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if rate < max*7/8 {
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// switch up
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layer := t.getLayerInfo()
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layer := t.getLayerInfo()
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if layer.tid < layer.maxTid {
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if layer.sid < layer.maxSid {
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layer.wantedSid = layer.sid + 1
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t.setLayerInfo(layer)
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} else if layer.tid < layer.maxTid {
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layer.wantedTid = layer.tid + 1
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layer.wantedTid = layer.tid + 1
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t.setLayerInfo(layer)
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t.setLayerInfo(layer)
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}
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}
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} else if rate > max*3/2 {
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} else if rate > max*3/2 {
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// switch down
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layer := t.getLayerInfo()
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layer := t.getLayerInfo()
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if layer.tid > 0 {
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if layer.tid > 0 {
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layer.wantedTid = layer.tid - 1
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layer.wantedTid = layer.tid - 1
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t.setLayerInfo(layer)
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t.setLayerInfo(layer)
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} else if layer.sid > 0 {
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layer.wantedSid = layer.sid - 1
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t.setLayerInfo(layer)
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}
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}
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}
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}
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}
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}
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