Initial work on a basic test program for the resampler.

This test will be replaced later with something better.

research/tests/mal_resampler_test_0.c

+#define DR_WAV_IMPLEMENTATION
+#include "../../../../dr_libs/dr_wav.h"
+
 #define MAL_DEBUG_OUTPUT
 #define MINI_AL_IMPLEMENTATION
 #include "../../mini_al.h"
 #include "../mal_resampler.h"
 
+#define SAMPLE_RATE_IN  44100
+#define SAMPLE_RATE_OUT 44100
+#define CHANNELS        1
+#define OUTPUT_FILE     "output.wav"
+
+mal_sine_wave sineWave;
+
+mal_uint32 on_read(mal_resampler* pResampler, mal_uint32 frameCount, void** ppFramesOut)
+{
+    mal_assert(pResampler->config.format == mal_format_f32);
+
+    return (mal_uint32)mal_sine_wave_read_ex(&sineWave, frameCount, pResampler->config.channels, pResampler->config.layout, (float**)ppFramesOut);
+}
+
 int main(int argc, char** argv)
 {
-    (void)argc;
-    (void)argv;
+    mal_result result;
+    mal_resampler_config resamplerConfig;
+    mal_resampler resampler;
 
+    mal_zero_object(&resamplerConfig);
+    resamplerConfig.format = mal_format_f32;
+    resamplerConfig.channels = CHANNELS;
+    resamplerConfig.sampleRateIn = SAMPLE_RATE_IN;
+    resamplerConfig.sampleRateOut = SAMPLE_RATE_OUT;
+    resamplerConfig.algorithm = mal_resampler_algorithm_linear;
+    resamplerConfig.endOfInputMode = mal_resampler_end_of_input_mode_consume;
+    resamplerConfig.layout = mal_stream_layout_interleaved;
+    resamplerConfig.onRead = on_read;
+    resamplerConfig.pUserData = NULL;
 
+    result = mal_resampler_init(&resamplerConfig, &resampler);
+    if (result != MAL_SUCCESS) {
+        printf("Failed to initialize resampler.\n");
+        return -1;
+    }
 
+    mal_sine_wave_init(0.5, 400, resamplerConfig.sampleRateIn, &sineWave);
+
+
+    // Write to a WAV file. We'll do about 10 seconds worth, making sure we read in chunks to make sure everything is seamless.
+    drwav_data_format format;
+    format.container = drwav_container_riff;
+    format.format = DR_WAVE_FORMAT_IEEE_FLOAT;
+    format.channels = resampler.config.channels;
+    format.sampleRate = resampler.config.sampleRateOut;
+    format.bitsPerSample = 32;
+    drwav* pWavWriter = drwav_open_file_write(OUTPUT_FILE, &format);
+
+    float buffer[SAMPLE_RATE_IN*CHANNELS];
+    float* pBuffer = buffer;
+    mal_uint32 iterations = 10;
+    mal_uint32 framesToReadPerIteration = mal_countof(buffer)/CHANNELS;
+    for (mal_uint32 i = 0; i < iterations; ++i) {
+        mal_uint32 framesRead = (mal_uint32)mal_resampler_read(&resampler, framesToReadPerIteration, &pBuffer);
+        drwav_write(pWavWriter, framesRead*CHANNELS, buffer);
+    }
+
+    //float** test = &buffer;
+
+    drwav_close(pWavWriter);
+
+    (void)argc;
+    (void)argv;
     return 0;
 }
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