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Select audio/video codec via SDP message manipulation #9
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Allow the user to force a specific audio or video codec by tweaking the SDP offer message to remove other codecs. This is a workaround for the fact codec selection is not exposed in the API.
| SdpForceCodecs(message_str, audio_codec_name_str, video_codec_name_str); | ||
| *length = std::min(out_message.size(), *length); | ||
| memcpy(buffer, out_message.c_str(), *length); | ||
| buffer[(*length)++] = '\0'; |
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No way to detect truncation?
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Good catch. I started to add it, and forgot to commit in that PR. Will fix.
stephenatwork
approved these changes
Jul 5, 2019
This was referenced Feb 10, 2022
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Allow the user to select a preferred audio and/or video codec by manipulating the SDP offer message
sent to the remote peer to remove all other supported codecs.
If the audio (respectively, video) codec specified is not advertised in the SDP offer message, then all the
original audio (respectively, video) codecs are left as is in the offer, to leave a chance to establish a connection, even with other codecs.
This is a workaround for the absence of API for selecting the codecs directly. This method is also used by the
PeerCCsample project of WebRTC UWP.