From 044975b37611131445e0532fed74271aad52987a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20Le=20Calvar?= <theo.le-calvar@imt-atlantique.fr>
Date: Sat, 13 May 2023 14:12:15 +0200
Subject: [PATCH] set bitrate to input if lower than target bitrate

---
 src/main.ts | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/main.ts b/src/main.ts
index 9af8bc0..e1246b2 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -165,11 +165,15 @@ function buildInitOptions() {
 }
 
 async function vodBuilder(params: EncoderOptionsBuilderParams) : Promise<EncoderOptions> {
-    const { resolution, fps, streamNum } = params
+    const { resolution, fps, streamNum, inputBitrate } = params
     const streamSuffix = streamNum == undefined ? '' : `:${streamNum}`
-    const targetBitrate = getTargetBitrate(resolution, fps)
+    let targetBitrate = getTargetBitrate(resolution, fps)
     let shouldInitVaapi = (streamNum == undefined || streamNum <= latestStreamNum)
 
+    if (targetBitrate > inputBitrate) {
+        targetBitrate = inputBitrate
+    }
+
     logger.info(`Building encoder options, received ${JSON.stringify(params)}`)
     
     if (shouldInitVaapi && streamNum != undefined) {
@@ -194,11 +198,15 @@ async function vodBuilder(params: EncoderOptionsBuilderParams) : Promise<Encoder
 
 
 async function liveBuilder(params: EncoderOptionsBuilderParams) : Promise<EncoderOptions> {
-    const { resolution, fps, streamNum } = params
+    const { resolution, fps, streamNum, inputBitrate } = params
     const streamSuffix = streamNum == undefined ? '' : `:${streamNum}`
-    const targetBitrate = getTargetBitrate(resolution, fps)
+    let targetBitrate = getTargetBitrate(resolution, fps)
     let shouldInitVaapi = (streamNum == undefined || streamNum <= latestStreamNum)
 
+    if (targetBitrate > inputBitrate) {
+        targetBitrate = inputBitrate
+    }
+
     logger.info(`Building encoder options, received ${JSON.stringify(params)}`)
 
     if (shouldInitVaapi && streamNum != undefined) {