From 2d998e37a42610efd982e6942208b5207d1016fe Mon Sep 17 00:00:00 2001 From: David Reid Date: Mon, 23 Jan 2023 12:56:32 +1000 Subject: [PATCH] Experimental support for passthrough nodes with zero inputs. --- miniaudio.h | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/miniaudio.h b/miniaudio.h index 59e66a83..a872f50a 100644 --- a/miniaudio.h +++ b/miniaudio.h @@ -70462,8 +70462,8 @@ static ma_result ma_node_translate_bus_counts(const ma_node_config* pConfig, ma_ /* Some special rules for passthrough nodes. */ if ((pConfig->vtable->flags & MA_NODE_FLAG_PASSTHROUGH) != 0) { - if (pConfig->vtable->inputBusCount != 1 || pConfig->vtable->outputBusCount != 1) { - return MA_INVALID_ARGS; /* Passthrough nodes must have exactly 1 input bus and 1 output bus. */ + if ((pConfig->vtable->inputBusCount != 0 && pConfig->vtable->inputBusCount != 1) || pConfig->vtable->outputBusCount != 1) { + return MA_INVALID_ARGS; /* Passthrough nodes must have exactly 1 output bus and either 0 or 1 input bus. */ } if (pConfig->pInputChannels[0] != pConfig->pOutputChannels[0]) { @@ -71152,6 +71152,15 @@ static ma_result ma_node_read_pcm_frames(ma_node* pNode, ma_uint32 outputBusInde frameCountOut = frameCount; /* Just read as much as we can. The callback will return what was actually read. */ ppFramesOut[0] = pFramesOut; + + /* + If it's a passthrough we won't be expecting the callback to output anything, so we'll + need to pre-silence the output buffer. + */ + if ((pNodeBase->vtable->flags & MA_NODE_FLAG_PASSTHROUGH) != 0) { + ma_silence_pcm_frames(pFramesOut, frameCount, ma_format_f32, ma_node_get_output_channels(pNode, outputBusIndex)); + } + ma_node_process_pcm_frames_internal(pNode, NULL, &frameCountIn, ppFramesOut, &frameCountOut); totalFramesRead = frameCountOut; } else {