Update the audio ring buffer to use the standard config/init pattern.

This makes it consistent with everything else in the library.

examples/duplex_effect.c

@@ -53,6 +53,7 @@ int main(int argc, char** argv)
     ma_data_source_node_config sourceNodeConfig;
     ma_data_source_node_config exciteNodeConfig;
     ma_waveform_config waveformConfig;
+    ma_audio_ring_buffer_config ringBufferConfig;
 
     deviceConfig = ma_device_config_init(ma_device_type_duplex);
     deviceConfig.capture.pDeviceID  = NULL;
@@ -115,7 +116,9 @@ int main(int argc, char** argv)
 
 
     /* Excite/modulator. Attached to input bus 1 of the vocoder node. */
-    result = ma_audio_ring_buffer_init(device.capture.format, device.capture.channels, device.sampleRate, device.capture.internalPeriodSizeInFrames * 3, NULL, &g_exciteData);
+    ringBufferConfig = ma_audio_ring_buffer_config_init(device.capture.format, device.capture.channels, device.sampleRate, device.capture.internalPeriodSizeInFrames * 3);
+
+    result = ma_audio_ring_buffer_init(&ringBufferConfig, &g_exciteData);
     if (result != MA_SUCCESS) {
         printf("Failed to initialize audio buffer for source.");
         goto done2;

examples/hilo_interop.c

@@ -35,6 +35,7 @@ int main(int argc, char** argv)
 {
     ma_result result;
     ma_device_config deviceConfig;
+    ma_audio_ring_buffer_config ringBufferConfig;
 
     /*
     The first thing we'll do is set up the capture side. There are two parts to this. The first is
@@ -59,7 +60,9 @@ int main(int argc, char** argv)
     }
 
     /* Initialize the ring buffer. Make sure the sample rate is set so the engine can resample it if necessary. */
-    result = ma_audio_ring_buffer_init(device.capture.format, device.capture.channels, device.sampleRate, device.capture.internalPeriodSizeInFrames * 3, NULL, &rb);
+    ringBufferConfig = ma_audio_ring_buffer_config_init(device.capture.format, device.capture.channels, device.sampleRate, device.capture.internalPeriodSizeInFrames * 3);
+    
+    result = ma_audio_ring_buffer_init(&ringBufferConfig, &rb);
     if (result != MA_SUCCESS) {
         printf("Failed to initialize the ring buffer.");
         return -1;

miniaudio.h

@@ -3568,25 +3568,30 @@ you will want to use. To initialize a ring buffer, do something like the followi
 
     ```c
     ma_audio_ring_buffer rb;
-    ma_result result = ma_audio_ring_buffer_init(FORMAT, CHANNELS, SAMPLE_RATE, BUFFER_SIZE_IN_FRAMES, NULL, &rb);
+    ma_audio_ring_buffer_config rbConfig;
+
+    rbConfig = ma_audio_ring_buffer_config_init(FORMAT, CHANNELS, SAMPLE_RATE, BUFFER_SIZE_IN_FRAMES);
+
+    ma_result result = ma_audio_ring_buffer_init(&rbConfig, &rb);
     if (result != MA_SUCCESS) {
         // Error
     }
     ```
 
-The `ma_audio_ring_buffer_init()` function takes the sample format, channel count and sample rate
-as parameters because it's the PCM variant of the ring buffer API. The sample rate is not used by
-the ring buffer internally and can be set to 0, but it is provided for the purpose of the data
-source implementation.
+The `ma_audio_ring_buffer_init()` follows the same config/init pattern used throughout miniaudio.
+The sample rate is not used by the ring buffer internally and can be set to 0, but it is provided
+for the purpose of the data source implementation.
 
 You can allocate your own underlying buffer to act as the backing store in which case you can
-initialize it like this:
+initialize specify it in the config:
 
     ```c
     void* pBuffer = malloc(BUFFER_SIZE_IN_FRAMES * bytesPerFrame * 2); // <-- The 2x is important.
 
-    ma_audio_ring_buffer rb;
-    ma_audio_ring_Buffer_init_ex(FORMAT, CHANNELS, SAMPLE_RATE, BUFFER_SIZE_IN_FRAMES, 0, pBuffer, &rb);
+    rbConfig = ma_audio_ring_buffer_config_init(FORMAT, CHANNELS, SAMPLE_RATE, BUFFER_SIZE_IN_FRAMES);
+    rbConfig.pBuffer = pBuffer;
+
+    ma_audio_ring_Buffer_init(&rbConfig, &rb);
     ```
 
 The size of the buffer must be 2 times the capacity. It is possible for you to use a mirrored
@@ -3594,7 +3599,13 @@ buffer where the second half of the buffer maps to the same physical memory as t
 this case you can specify the `MA_RING_BUFFER_FLAG_MIRRORED` flag:
 
     ```c
-    ma_audio_ring_buffer_init_ex(FORMAT, CHANNELS, SAMPLE_RATE, BUFFER_SIZE_IN_FRAMES, MA_RING_BUFFER_FLAG_MIRRORED, pBuffer, &rb);
+    void* pBuffer = ...; // <-- Your own OS-specific allocation routine goes here. It must have 2x the addressable space as the the capacity.
+
+    rbConfig = ma_audio_ring_buffer_config_init(FORMAT, CHANNELS, SAMPLE_RATE, BUFFER_SIZE_IN_FRAMES);
+    rbConfig.flags   = MA_RING_BUFFER_FLAG_MIRRORED;
+    rbConfig.pBuffer = pBuffer;
+
+    ma_audio_ring_buffer_init(&rbConfig, &rb);
     ```
 
 To read and write data you map and unmap a pointer. For writing, you can do something like this:
@@ -6284,6 +6295,20 @@ MA_API ma_uint32 ma_ring_buffer_capacity(const ma_ring_buffer* pRingBuffer);
 /* END ma_ring_buffer.h */
 
 
+typedef struct ma_audio_ring_buffer_config
+{
+    ma_format format;
+    ma_uint32 channels;
+    ma_uint32 sampleRate;   /* Can be zero. Not used for the actual function of the ring buffer. Stored for the purpose of the data source abstraction. */
+    ma_uint32 sizeInFrames; /* The capacity of the ring buffer in frames. */
+    ma_uint32 flags;
+    void* pBuffer;          /* Can be null in which case it'll be allocated internally. */
+    const ma_allocation_callbacks* pAllocationCallbacks;
+} ma_audio_ring_buffer_config;
+
+MA_API ma_audio_ring_buffer_config ma_audio_ring_buffer_config_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, ma_uint32 sizeInFrames);
+
+
 typedef struct ma_audio_ring_buffer
 {
     ma_data_source_base ds;
@@ -6296,8 +6321,7 @@ typedef struct ma_audio_ring_buffer
     ma_allocation_callbacks allocationCallbacks;
 } ma_audio_ring_buffer;
 
-MA_API ma_result ma_audio_ring_buffer_init_ex(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, ma_uint32 capacityInFrames, ma_uint32 flags, void* pBuffer, ma_audio_ring_buffer* pRingBuffer);
-MA_API ma_result ma_audio_ring_buffer_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, ma_uint32 capacityInFrames, const ma_allocation_callbacks* pAllocationCallbacks, ma_audio_ring_buffer* pRingBuffer);
+MA_API ma_result ma_audio_ring_buffer_init(const ma_audio_ring_buffer_config* pConfig, ma_audio_ring_buffer* pRingBuffer);
 MA_API void ma_audio_ring_buffer_uninit(ma_audio_ring_buffer* pRingBuffer);
 MA_API ma_uint32 ma_audio_ring_buffer_map_produce(ma_audio_ring_buffer* pRingBuffer, ma_uint32 frameCount, void** ppMappedBuffer);    /* Returns the number of frames actually mapped. */
 MA_API void ma_audio_ring_buffer_unmap_produce(ma_audio_ring_buffer* pRingBuffer, ma_uint32 frameCount);
@@ -32474,7 +32498,10 @@ static void ma_stream_event_process__pipewire(void* pUserData, ma_device_type de
         pStreamState->rbSizeInFrames = (ma_uint32)time.size;
 
         if (ma_device_get_threading_mode(pDeviceStatePipeWire->pDevice) == MA_THREADING_MODE_SINGLE_THREADED) {
-            ma_audio_ring_buffer_init(pStreamState->format, pStreamState->channels, pStreamState->sampleRate, pStreamState->rbSizeInFrames, ma_device_get_allocation_callbacks(pDeviceStatePipeWire->pDevice), &pStreamState->rb);
+            ma_audio_ring_buffer_config ringBufferConfig = ma_audio_ring_buffer_config_init(pStreamState->format, pStreamState->channels, pStreamState->sampleRate, pStreamState->rbSizeInFrames);
+            ringBufferConfig.pAllocationCallbacks = ma_device_get_allocation_callbacks(pDeviceStatePipeWire->pDevice);
+
+            ma_audio_ring_buffer_init(&ringBufferConfig, &pStreamState->rb);
         }
 
         pStreamState->initStatus |= MA_PIPEWIRE_INIT_STATUS_HAS_LATENCY;
@@ -63666,11 +63693,28 @@ static ma_data_source_vtable ma_gDataSourceVTable_AudioRingBuffer =
 };
 
 
-MA_API ma_result ma_audio_ring_buffer_init_ex(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, ma_uint32 capacityInFrames, ma_uint32 flags, void* pBuffer, ma_audio_ring_buffer* pRingBuffer)
+MA_API ma_audio_ring_buffer_config ma_audio_ring_buffer_config_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, ma_uint32 sizeInFrames)
+{
+    ma_audio_ring_buffer_config config;
+
+    MA_ZERO_OBJECT(&config);
+    config.format       = format;
+    config.channels     = channels;
+    config.sampleRate   = sampleRate;
+    config.sizeInFrames = sizeInFrames;
+    config.flags        = 0;
+    config.pBuffer      = NULL;
+    
+    return config;
+}
+
+MA_API ma_result ma_audio_ring_buffer_init(const ma_audio_ring_buffer_config* pConfig, ma_audio_ring_buffer* pRingBuffer)
 {
     ma_result result;
     ma_data_source_config dataSourceConfig;
     ma_uint32 bpf;
+    ma_bool32 isOwnerOfBuffer = MA_FALSE;
+    void* pBuffer;
 
     if (pRingBuffer == NULL) {
         return MA_INVALID_ARGS;
@@ -63678,11 +63722,15 @@ MA_API ma_result ma_audio_ring_buffer_init_ex(ma_format format, ma_uint32 channe
 
     MA_ZERO_OBJECT(pRingBuffer);
 
-    if (capacityInFrames == 0) {
+    if (pConfig == NULL) {
         return MA_INVALID_ARGS;
     }
 
-    bpf = ma_get_bytes_per_frame(format, channels);
+    if (pConfig->format == ma_format_unknown || pConfig->channels == 0 || pConfig->sizeInFrames == 0) {
+        return MA_INVALID_ARGS;
+    }
+
+    bpf = ma_get_bytes_per_frame(pConfig->format, pConfig->channels);
     if (bpf == 0) {
         return MA_INVALID_ARGS;
     }
@@ -63696,50 +63744,33 @@ MA_API ma_result ma_audio_ring_buffer_init_ex(ma_format format, ma_uint32 channe
         return result;
     }
 
+    /* Allocate a buffer if necessary. */
+    if (pConfig->pBuffer == NULL) {
+        size_t bufferSizeInBytes;
+
+        bufferSizeInBytes = pConfig->sizeInFrames * bpf * 2;    /* Buffer must 2x the capacity. */
+        MA_ASSERT(bufferSizeInBytes != 0);
+
+        pBuffer = ma_malloc(bufferSizeInBytes, pConfig->pAllocationCallbacks);
+        if (pBuffer == NULL) {
+            ma_data_source_uninit(&pRingBuffer->ds);
+            return MA_OUT_OF_MEMORY;
+        }
+
+        isOwnerOfBuffer = MA_TRUE;
+    } else {
+        pBuffer = pConfig->pBuffer;
+        isOwnerOfBuffer = MA_FALSE;
+    }
+
     /* Now for the ring buffer. */
-    ma_ring_buffer_init(capacityInFrames, bpf, flags, pBuffer, &pRingBuffer->rb);
-    pRingBuffer->format     = format;
-    pRingBuffer->channels   = channels;
-    pRingBuffer->sampleRate = sampleRate;
-    pRingBuffer->pBuffer    = pBuffer;
-
-    return MA_SUCCESS;
-}
-
-MA_API ma_result ma_audio_ring_buffer_init(ma_format format, ma_uint32 channels, ma_uint32 sampleRate, ma_uint32 capacityInFrames, const ma_allocation_callbacks* pAllocationCallbacks, ma_audio_ring_buffer* pRingBuffer)
-{
-    ma_result result;
-    ma_uint32 bpf;
-    void* pBuffer;
-
-    if (pRingBuffer == NULL) {
-        return MA_INVALID_ARGS;
-    }
-
-    MA_ZERO_OBJECT(pRingBuffer);
-
-    if (capacityInFrames == 0) {
-        return MA_INVALID_ARGS;
-    }
-
-    bpf = ma_get_bytes_per_frame(format, channels);
-    if (bpf == 0) {
-        return MA_INVALID_ARGS;
-    }
-
-    pBuffer = ma_malloc(capacityInFrames * bpf * 2, pAllocationCallbacks);
-    if (pBuffer == NULL) {
-        return MA_OUT_OF_MEMORY;
-    }
-
-    result = ma_audio_ring_buffer_init_ex(format, channels, sampleRate, capacityInFrames, 0, pBuffer, pRingBuffer);
-    if (result != MA_SUCCESS) {
-        ma_free(pBuffer, pAllocationCallbacks);
-        return result;
-    }
-
-    ma_allocation_callbacks_init_copy(&pRingBuffer->allocationCallbacks, pAllocationCallbacks);
-    pRingBuffer->isOwnerOfBuffer = MA_TRUE;
+    ma_ring_buffer_init(pConfig->sizeInFrames, bpf, pConfig->flags, pBuffer, &pRingBuffer->rb);
+    pRingBuffer->format          = pConfig->format;
+    pRingBuffer->channels        = pConfig->channels;
+    pRingBuffer->sampleRate      = pConfig->sampleRate;
+    pRingBuffer->isOwnerOfBuffer = isOwnerOfBuffer;
+    pRingBuffer->pBuffer         = pBuffer;
+    ma_allocation_callbacks_init_copy(&pRingBuffer->allocationCallbacks, pConfig->pAllocationCallbacks);
 
     return MA_SUCCESS;
 }
@@ -63907,13 +63938,17 @@ MA_API ma_result ma_duplex_rb_init(ma_format captureFormat, ma_uint32 captureCha
 {
     ma_result result;
     ma_uint32 sizeInFrames;
+    ma_audio_ring_buffer_config ringBufferConfig;
 
     sizeInFrames = (ma_uint32)ma_calculate_frame_count_after_resampling(sampleRate, captureInternalSampleRate, captureInternalPeriodSizeInFrames * 3);
     if (sizeInFrames == 0) {
         return MA_INVALID_ARGS;
     }
 
-    result = ma_audio_ring_buffer_init(captureFormat, captureChannels, sampleRate, sizeInFrames, pAllocationCallbacks, &pRB->rb);
+    ringBufferConfig = ma_audio_ring_buffer_config_init(captureFormat, captureChannels, sampleRate, sizeInFrames);
+    ringBufferConfig.pAllocationCallbacks = pAllocationCallbacks;
+
+    result = ma_audio_ring_buffer_init(&ringBufferConfig, &pRB->rb);
     if (result != MA_SUCCESS) {
         return result;
     }