Add simple_duplex example and remove old duplex text.

Duplex can be tested with the deviceio test.

examples/simple_duplex.c

+#define MINIAUDIO_IMPLEMENTATION
+#include "../miniaudio.h"
+
+#define DR_WAV_IMPLEMENTATION
+#include "../extras/dr_wav.h"
+
+#include <stdio.h>
+
+#ifdef __EMSCRIPTEN__
+void main_loop__em()
+{
+}
+#endif
+
+void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
+{
+    MA_ASSERT(pDevice->capture.format == pDevice->playback.format);
+    MA_ASSERT(pDevice->capture.channels == pDevice->playback.channels);
+
+    /* In this example the format and channel count are the same for both input and output which means we can just memcpy(). */
+    MA_COPY_MEMORY(pOutput, pInput, frameCount * ma_get_bytes_per_frame(pDevice->capture.format, pDevice->capture.channels));
+}
+
+int main(int argc, char** argv)
+{
+    ma_result result;
+    ma_device_config deviceConfig;
+    ma_device device;
+
+    deviceConfig = ma_device_config_init(ma_device_type_duplex);
+    deviceConfig.capture.pDeviceID  = NULL;
+    deviceConfig.capture.format     = ma_format_s16;
+    deviceConfig.capture.channels   = 2;
+    deviceConfig.capture.shareMode  = ma_share_mode_shared;
+    deviceConfig.playback.pDeviceID = NULL;
+    deviceConfig.playback.format    = ma_format_s16;
+    deviceConfig.playback.channels  = 2;
+    deviceConfig.dataCallback       = data_callback;
+    result = ma_device_init(NULL, &deviceConfig, &device);
+    if (result != MA_SUCCESS) {
+        return result;
+    }
+
+#ifdef __EMSCRIPTEN__
+    getchar();
+#endif
+
+    ma_device_start(&device);
+
+#ifdef __EMSCRIPTEN__
+    emscripten_set_main_loop(main_loop__em, 0, 1);
+#else
+    printf("Press Enter to quit...\n");
+    getchar();
+#endif
+
+    ma_device_uninit(&device);
+
+    (void)argc;
+    (void)argv;
+    return 0;
+}

tests/ma_duplex.c

-#include <stdio.h>
-
-#define MA_PREFER_SSE2
-#define MA_DEBUG_OUTPUT
-#define MINIAUDIO_IMPLEMENTATION
-#include "../miniaudio.h"
-
-#define DR_WAV_IMPLEMENTATION
-#include "../extras/dr_wav.h"
-
-#define OUTPUT_WAV 0
-
-#ifdef __EMSCRIPTEN__
-void main_loop__em()
-{
-}
-#endif
-
-void log_callback(ma_context* pContext, ma_device* pDevice, ma_uint32 logLevel, const char* message)
-{
-    (void)pContext;
-    (void)pDevice;
-    (void)logLevel;
-    printf("%s\n", message);
-}
-
-void stop_callback(ma_device* pDevice)
-{
-    (void)pDevice;
-    printf("STOPPED\n");
-}
-
-void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uint32 frameCount)
-{
-    MA_ASSERT(pDevice->capture.format == pDevice->playback.format);
-
-    /* In this test the format and channel count are the same for both input and output which means we can just memcpy(). */
-    MA_COPY_MEMORY(pOutput, pInput, frameCount * ma_get_bytes_per_frame(pDevice->capture.format, pDevice->capture.channels));
-
-#if defined(OUTPUT_WAV) && OUTPUT_WAV==1
-    /* Also write to a wav file for debugging. */
-    drwav* pWav = (drwav*)pDevice->pUserData;
-    ma_assert(pWav != NULL);
-
-    drwav_write_pcm_frames(pWav, frameCount, pInput);
-#endif
-}
-
-int main(int argc, char** argv)
-{
-    ma_result result;
-
-#if defined(OUTPUT_WAV) && OUTPUT_WAV==1
-    drwav_data_format wavFormat;
-    wavFormat.container     = drwav_container_riff;
-    wavFormat.format        = DR_WAVE_FORMAT_PCM;
-    wavFormat.channels      = 2;
-    wavFormat.sampleRate    = 44100;
-    wavFormat.bitsPerSample = 16;
-
-    drwav wav;
-    if (drwav_init_file_write(&wav, "output.wav", &wavFormat) == DRWAV_FALSE) {
-        printf("Failed to initialize output file.\n");
-        return -1;
-    }
-#endif
-    
-
-    ma_backend backend = ma_backend_wasapi;
-
-    ma_context_config contextConfig = ma_context_config_init();
-    contextConfig.logCallback = log_callback;
-    contextConfig.alsa.useVerboseDeviceEnumeration = MA_TRUE;
-    contextConfig.threadPriority = ma_thread_priority_realtime;
-
-    ma_context context;
-    result = ma_context_init(&backend, 1, &contextConfig, &context);
-    if (result != MA_SUCCESS) {
-        printf("Failed to initialize context.\n");
-        return result;
-    }
-
-
-    /* ALSA debugging. */
-#if defined(MA_SUPPORT_ALSA)
-    if (backend == ma_backend_alsa) {
-        ma_device_info* pPlaybackDevices;
-        ma_uint32 playbackDeviceCount;
-        ma_device_info* pCaptureDevices;
-        ma_uint32 captureDeviceCount;
-        ma_context_get_devices(&context, &pPlaybackDevices, &playbackDeviceCount, &pCaptureDevices, &captureDeviceCount);
-
-        printf("Playback Devices:\n");
-        for (ma_uint32 iDevice = 0; iDevice < playbackDeviceCount; iDevice += 1) {
-            printf("    ALSA Device ID: %s\n", pPlaybackDevices[iDevice].id.alsa);
-        }
-        printf("Capture Devices:\n");
-        for (ma_uint32 iDevice = 0; iDevice < captureDeviceCount; iDevice += 1) {
-            printf("    ALSA Device ID: %s\n", pCaptureDevices[iDevice].id.alsa);
-        }
-    }
-#endif
-
-
-    ma_device_config deviceConfig = ma_device_config_init(ma_device_type_duplex);
-    deviceConfig.capture.pDeviceID        = NULL;
-    deviceConfig.capture.format           = ma_format_s16;
-    deviceConfig.capture.channels         = 2;
-    deviceConfig.capture.shareMode        = ma_share_mode_shared;
-    deviceConfig.playback.pDeviceID       = NULL;
-    deviceConfig.playback.format          = ma_format_s16;
-    deviceConfig.playback.channels        = 2;
-    deviceConfig.playback.shareMode       = ma_share_mode_shared;
-    deviceConfig.sampleRate               = 0;
-    deviceConfig.periodSizeInFrames       = 0;
-    deviceConfig.periodSizeInMilliseconds = 10;
-    deviceConfig.periods                  = 3;
-    deviceConfig.dataCallback             = data_callback;
-    deviceConfig.stopCallback             = stop_callback;
-#if defined(OUTPUT_WAV) && OUTPUT_WAV==1
-    deviceConfig.pUserData          = &wav;
-#endif
-    deviceConfig.wasapi.noAutoConvertSRC = MA_TRUE;
-
-    ma_device device;
-    result = ma_device_init(&context, &deviceConfig, &device);
-    if (result != MA_SUCCESS) {
-        return result;
-    }
-
-    /* For debugging. */
-    printf("device.playback.internalPeriodSizeInFrames = %d\n", device.playback.internalPeriodSizeInFrames);
-    printf("device.playback.internalPeriods            = %d\n", device.playback.internalPeriods);
-    printf("device.capture.internalPeriodSizeInFrames  = %d\n", device.capture.internalPeriodSizeInFrames);
-    printf("device.capture.internalPeriods             = %d\n", device.capture.internalPeriods);
-
-
-#ifdef __EMSCRIPTEN__
-    getchar();
-#endif
-
-    ma_device_start(&device);
-
-#ifdef __EMSCRIPTEN__
-    emscripten_set_main_loop(main_loop__em, 0, 1);
-#else
-    printf("Press Enter to quit...\n");
-    getchar();
-#endif
-
-    ma_device_uninit(&device);
-
-#if defined(OUTPUT_WAV) && OUTPUT_WAV==1
-    drwav_uninit(&wav);
-#endif
-
-    (void)argc;
-    (void)argv;
-    return 0;
-}