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common: fix sdp default rtpmap props

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This commit is contained in:
Koushik Dutta
2025-04-21 09:02:25 -07:00
parent 51e0a8836d
commit 58b27805ba
1 changed files with 12 additions and 2 deletions
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14
common/src/sdp-utils.ts
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@@ -175,6 +175,8 @@ export type RTPMap = ReturnType<typeof parseRtpMap>;
export function parseRtpMap(mline: ReturnType<typeof parseMLine>, rtpmap: string) {
const mlineType = mline.type;
const match = rtpmap?.match(/a=rtpmap:([\d]+) (.*?)\/([\d]+)(\/([\d]+))?/);
let channels = parseInt(match?.[5]) || undefined;
let payloadType = parseInt(match?.[1]);
rtpmap = rtpmap?.toLowerCase();
@@ -222,14 +224,20 @@ export function parseRtpMap(mline: ReturnType<typeof parseMLine>, rtpmap: string
if (mline.payloadTypes?.includes(0)) {
codec = 'pcm_mulaw';
ffmpegEncoder = 'pcm_mulaw';
payloadType = 0;
channels = 1;
}
else if (mline.payloadTypes?.includes(8)) {
codec = 'pcm_alaw';
ffmpegEncoder = 'pcm_alaw';
payloadType = 8;
channels = 1;
}
else if (mline.payloadTypes?.includes(14)) {
codec = 'mp3';
ffmpegEncoder = 'mp3';
payloadType = 14;
channels = 2;
}
else {
// ffmpeg seems to omit the rtpmap type for pcm alaw when creating sdp?
@@ -239,6 +247,8 @@ export function parseRtpMap(mline: ReturnType<typeof parseMLine>, rtpmap: string
// https://en.wikipedia.org/wiki/RTP_payload_formats
codec = 'pcm_alaw';
ffmpegEncoder = 'pcm_alaw';
payloadType = 8;
channels = 1;
}
}
@@ -258,8 +268,8 @@ export function parseRtpMap(mline: ReturnType<typeof parseMLine>, rtpmap: string
ffmpegEncoder,
rawCodec: match?.[2],
clock,
channels: parseInt(match?.[5]) || undefined,
payloadType: parseInt(match?.[1]),
channels,
payloadType,
}
}