From 55e4e6a951ca2b5bb23cdc600c6661e76c70a50a Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Thu, 27 Dec 2018 13:13:11 +0100
Subject: Expand mono sounds to stereo (duplicate channel), skip channels >
 stereo and resample all sounds to 48kHz.

---
 src/soundplayer.cc | 50 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/soundplayer.cc b/src/soundplayer.cc
index e5feebc..2570f31 100644
--- a/src/soundplayer.cc
+++ b/src/soundplayer.cc
@@ -29,6 +29,7 @@
 
 #include <ao/ao.h>
 #include <sndfile.h>
+#include <samplerate.h>
 
 #define BUFSZ 512
 
@@ -40,7 +41,7 @@ SoundPlayer::SoundPlayer()
 SoundPlayer::~SoundPlayer()
 {
 	running = false;
-  wait();
+	wait();
 }
 
 void SoundPlayer::run()
@@ -52,7 +53,7 @@ void SoundPlayer::run()
 	ao_sample_format sf;
 	memset(&sf, 0, sizeof(sf));
 	sf.bits = 16;
-	sf.rate = 44100;
+	sf.rate = 48000;
 	sf.channels = 2;
 	sf.byte_format = AO_FMT_NATIVE;
 
@@ -67,7 +68,6 @@ void SoundPlayer::run()
 			QMutexLocker lock(&mutex);
 			while(queue.size())
 			{
-				printf(" - New sound\n");
 				active.append(queue.front());
 				queue.pop_front();
 			}
@@ -121,9 +121,51 @@ void SoundPlayer::playFile(QString file)
 	size_t size = sf_info.frames * sf_info.channels;
 	float *data = new float[size];
 	sf_read_float(fh, data, size);
-
 	sf_close(fh);
 
+	if(sf_info.channels != 2)
+	{
+		float* stereo_data = new float[sf_info.frames * 2];
+		for(int i = 0; i < sf_info.frames; ++i)
+		{
+			int c = 0;
+			for(;c < sf_info.channels && c < 2; ++c)
+			{
+				stereo_data[i * 2 + c] = data[i * sf_info.channels + c];
+			}
+			int last = c - 1;
+			for(;c < 2; ++c)
+			{
+				stereo_data[i * 2 + c] = data[i * sf_info.channels + last];
+			}
+		}
+		delete[] data;
+		data = stereo_data;
+		size = sf_info.frames * 2;
+	}
+
+	if(sf_info.samplerate != 48000)
+	{
+		double ratio = 48000.0 / sf_info.samplerate;
+		std::size_t resampled_size = sf_info.frames * 2 * ratio;
+		float *resampled_data = new float[resampled_size + 1];
+
+		SRC_DATA s{};
+		s.data_in = data;
+		s.input_frames = sf_info.frames;
+
+		s.data_out = resampled_data;
+		s.output_frames = resampled_size + 1;
+
+		s.src_ratio = ratio;
+
+		src_simple(&s, SRC_SINC_BEST_QUALITY, 2);
+		delete[] data;
+		data = resampled_data;
+		size = s.output_frames_gen * 2;
+		printf("size: %d\n", (int)size);
+	}
+
 	QueueItem qi;
 	qi.samples = data;
 	qi.pos = 0;
-- 
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