moonlight-stream/moonlight-common-c
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Reduce audio bitrate when streaming with a low video bitrate

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Cameron Gutman 2018-05-27 17:29:20 -07:00
parent c4692a5b5f
commit 783af66324
1 changed files with 21 additions and 0 deletions
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21
src/SdpGenerator.c
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@ -11,6 +11,8 @@
#define CHANNEL_MASK_STEREO 0x3 #define CHANNEL_MASK_STEREO 0x3
#define CHANNEL_MASK_51_SURROUND 0xFC #define CHANNEL_MASK_51_SURROUND 0xFC
#define LOW_BITRATE_THRESHOLD 5000
typedef struct _SDP_OPTION { typedef struct _SDP_OPTION {
char name[MAX_OPTION_NAME_LEN + 1]; char name[MAX_OPTION_NAME_LEN + 1];
void* payload; void* payload;
@ -358,6 +360,25 @@ static PSDP_OPTION getAttributesList(char*urlSafeAddr) {
else { else {
err |= addAttributeString(&optionHead, "x-nv-audio.surround.enable", "0"); err |= addAttributeString(&optionHead, "x-nv-audio.surround.enable", "0");
} }
if (AppVersionQuad[0] >= 7) {
if (StreamConfig.bitrate < LOW_BITRATE_THRESHOLD && audioChannelCount == 2) {
// At low bitrates, cap the stereo audio bitrate to reduce data usage. For some reason,
// GFE seems to always enable high quality (512 Kbps) mode for stereo even though we
// don't specify that we want it via SDP. 5.1 audio properly remains at normal quality
// mode by default. To work around high quality mode, use adaptive bitrate with a
// min = max clamp (like we do for video).
err |= addAttributeString(&optionHead, "x-nv-audioBitrate.adaptiveBitrateEnable", "1");
err |= addAttributeString(&optionHead, "x-nv-audioBitrate.local2chMin", "96");
err |= addAttributeString(&optionHead, "x-nv-audioBitrate.local2chMax", "96");
err |= addAttributeString(&optionHead, "x-nv-audioBitrate.remote2chMin", "96");
err |= addAttributeString(&optionHead, "x-nv-audioBitrate.remote2chMax", "96");
}
else {
// Disable audio bitrate cap
err |= addAttributeString(&optionHead, "x-nv-audioBitrate.adaptiveBitrateEnable", "0");
}
}
} }
if (err == 0) { if (err == 0) {