From d2ffd0fdd27079a758a925e73dd4264f9fdae7ec Mon Sep 17 00:00:00 2001
From: jp9000 <obs.jim@gmail.com>
Date: Mon, 31 Jul 2017 14:51:21 -0700
Subject: [PATCH] obs-ffmpeg: Ensure sample rate is supported in audio encoder

Ensures that the sample rate is supported in the audio encoders, and if
not, then make it automatically resample to the closest sample rate.
---
 .../obs-ffmpeg/obs-ffmpeg-audio-encoders.c    | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/plugins/obs-ffmpeg/obs-ffmpeg-audio-encoders.c b/plugins/obs-ffmpeg/obs-ffmpeg-audio-encoders.c
index 79bcf054b..974db277c 100644
--- a/plugins/obs-ffmpeg/obs-ffmpeg-audio-encoders.c
+++ b/plugins/obs-ffmpeg/obs-ffmpeg-audio-encoders.c
@@ -163,6 +163,24 @@ static void *enc_create(obs_data_t *settings, obs_encoder_t *encoder,
 	enc->context->sample_fmt  = enc->codec->sample_fmts ?
 		enc->codec->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
 
+	/* check to make sure sample rate is supported */
+	if (enc->codec->supported_samplerates) {
+		const int *rate = enc->codec->supported_samplerates;
+		int cur_rate = enc->context->sample_rate;
+		int closest = 0;
+
+		while (rate) {
+			int dist = abs(cur_rate - *rate);
+			int closest_dist = abs(cur_rate - closest);
+
+			if (dist < closest_dist)
+				closest = *rate;
+		}
+
+		if (closest)
+			enc->context->sample_rate = closest;
+	}
+
 	/* if using FFmpeg's AAC encoder, at least set a cutoff value
 	 * (recommended by konverter) */
 	if (strcmp(enc->codec->name, "aac") == 0) {
@@ -287,6 +305,7 @@ static void enc_audio_info(void *data, struct audio_convert_info *info)
 {
 	struct enc_encoder *enc = data;
 	info->format = convert_ffmpeg_sample_format(enc->context->sample_fmt);
+	info->samples_per_sec = (uint32_t)enc->context->sample_rate;
 }
 
 static size_t enc_frame_size(void *data)