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103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
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#include "ma_ltrim_node.h"
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MA_API ma_ltrim_node_config ma_ltrim_node_config_init(ma_uint32 channels, float threshold)
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{
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ma_ltrim_node_config config;
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MA_ZERO_OBJECT(&config);
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config.nodeConfig = ma_node_config_init(); /* Input and output channels will be set in ma_ltrim_node_init(). */
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config.channels = channels;
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config.threshold = threshold;
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return config;
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}
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static void ma_ltrim_node_process_pcm_frames(ma_node* pNode, const float** ppFramesIn, ma_uint32* pFrameCountIn, float** ppFramesOut, ma_uint32* pFrameCountOut)
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{
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ma_ltrim_node* pTrimNode = (ma_ltrim_node*)pNode;
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ma_uint32 framesProcessedIn = 0;
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ma_uint32 framesProcessedOut = 0;
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ma_uint32 channelCount = ma_node_get_input_channels(pNode, 0);
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/*
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If we haven't yet found the start, skip over every input sample until we find a frame outside
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of the threshold.
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*/
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if (pTrimNode->foundStart == MA_FALSE) {
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while (framesProcessedIn < *pFrameCountIn) {
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ma_uint32 iChannel = 0;
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for (iChannel = 0; iChannel < channelCount; iChannel += 1) {
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float sample = ppFramesIn[0][framesProcessedIn*channelCount + iChannel];
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if (sample < -pTrimNode->threshold || sample > pTrimNode->threshold) {
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pTrimNode->foundStart = MA_TRUE;
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break;
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}
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}
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if (pTrimNode->foundStart) {
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break; /* The start has been found. Get out of this loop and finish off processing. */
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} else {
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framesProcessedIn += 1;
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}
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}
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}
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/* If there's anything left, just copy it over. */
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framesProcessedOut = ma_min(*pFrameCountOut, *pFrameCountIn - framesProcessedIn);
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ma_copy_pcm_frames(ppFramesOut[0], &ppFramesIn[0][framesProcessedIn], framesProcessedOut, ma_format_f32, channelCount);
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framesProcessedIn += framesProcessedOut;
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/* We always "process" every input frame, but we may only done a partial output. */
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*pFrameCountIn = framesProcessedIn;
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*pFrameCountOut = framesProcessedOut;
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}
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static ma_node_vtable g_ma_ltrim_node_vtable =
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{
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ma_ltrim_node_process_pcm_frames,
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NULL,
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1, /* 1 input channel. */
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1, /* 1 output channel. */
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MA_NODE_FLAG_DIFFERENT_PROCESSING_RATES
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};
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MA_API ma_result ma_ltrim_node_init(ma_node_graph* pNodeGraph, const ma_ltrim_node_config* pConfig, const ma_allocation_callbacks* pAllocationCallbacks, ma_ltrim_node* pTrimNode)
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{
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ma_result result;
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ma_node_config baseConfig;
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if (pTrimNode == NULL) {
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return MA_INVALID_ARGS;
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}
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MA_ZERO_OBJECT(pTrimNode);
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if (pConfig == NULL) {
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return MA_INVALID_ARGS;
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}
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pTrimNode->threshold = pConfig->threshold;
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pTrimNode->foundStart = MA_FALSE;
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baseConfig = pConfig->nodeConfig;
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baseConfig.vtable = &g_ma_ltrim_node_vtable;
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baseConfig.pInputChannels = &pConfig->channels;
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baseConfig.pOutputChannels = &pConfig->channels;
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result = ma_node_init(pNodeGraph, &baseConfig, pAllocationCallbacks, &pTrimNode->baseNode);
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if (result != MA_SUCCESS) {
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return result;
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}
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return MA_SUCCESS;
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}
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MA_API void ma_ltrim_node_uninit(ma_ltrim_node* pTrimNode, const ma_allocation_callbacks* pAllocationCallbacks)
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{
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/* The base node is always uninitialized first. */
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ma_node_uninit(pTrimNode, pAllocationCallbacks);
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}
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