Add support for copying audio ring buffers.

miniaudio.h

@@ -6468,6 +6468,7 @@ typedef struct ma_audio_ring_buffer
 } ma_audio_ring_buffer;
 
 MA_API ma_result ma_audio_ring_buffer_init(const ma_audio_ring_buffer_config* pConfig, ma_audio_ring_buffer* pRingBuffer);
+MA_API ma_result ma_audio_ring_buffer_init_copy(ma_audio_ring_buffer* pRingBuffer, ma_audio_ring_buffer* pNewRingBuffer);
 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);
@@ -68310,6 +68311,11 @@ static void ma_audio_ring_buffer__data_source_on_uninit(ma_data_source* pDataSou
     ma_audio_ring_buffer_uninit((ma_audio_ring_buffer*)pDataSource);
 }
 
+static ma_result ma_audio_ring_buffer__data_source_on_copy(ma_data_source* pDataSource, ma_data_source* pNewDataSource)
+{
+    return ma_audio_ring_buffer_init_copy((ma_audio_ring_buffer*)pDataSource, (ma_audio_ring_buffer*)pNewDataSource);
+}
+
 static ma_result ma_audio_ring_buffer__data_source_on_read(ma_data_source* pDataSource, void* pFrames, ma_uint64 frameCount, ma_uint64* pFramesRead)
 {
     ma_audio_ring_buffer* pRingBuffer = (ma_audio_ring_buffer*)pDataSource;
@@ -68371,7 +68377,7 @@ static ma_data_source_vtable ma_gDataSourceVTable_AudioRingBuffer =
 {
     ma_audio_ring_buffer__data_source_on_sizeof,
     ma_audio_ring_buffer__data_source_on_uninit,
-    NULL,   /* onCopy */
+    ma_audio_ring_buffer__data_source_on_copy,
     ma_audio_ring_buffer__data_source_on_read,
     NULL,   /* No seeking in ring buffers. */
     ma_audio_ring_buffer__data_source_on_get_data_format,
@@ -68463,6 +68469,30 @@ MA_API ma_result ma_audio_ring_buffer_init(const ma_audio_ring_buffer_config* pC
     return MA_SUCCESS;
 }
 
+MA_API ma_result ma_audio_ring_buffer_init_copy(ma_audio_ring_buffer* pRingBuffer, ma_audio_ring_buffer* pNewRingBuffer)
+{
+    ma_audio_ring_buffer_config config;
+
+    if (pNewRingBuffer == NULL || pRingBuffer == NULL) {
+        return MA_INVALID_ARGS;
+    }
+
+    config = ma_audio_ring_buffer_config_init(pRingBuffer->format, pRingBuffer->channels, pRingBuffer->sampleRate, pRingBuffer->rb.capacity);
+    config.pAllocationCallbacks = &pRingBuffer->allocationCallbacks;
+
+    /*
+    For the buffer, if it's an internally managed we want to make sure the copy is also internally managed. If it's externally
+    managed we can make the copy also external.
+    */
+    if (pRingBuffer->isOwnerOfBuffer) {
+        config.pBuffer = NULL;                  /* Internally managed. Set the buffer to null to trigger the new ring buffer to also allocate it's own buffer. */
+    } else {
+        config.pBuffer = pRingBuffer->pBuffer;  /* Externally managed. Just reuse the buffer. */
+    }
+
+    return ma_audio_ring_buffer_init(&config, pNewRingBuffer);
+}
+
 MA_API void ma_audio_ring_buffer_uninit(ma_audio_ring_buffer* pRingBuffer)
 {
     if (pRingBuffer == NULL) {