Holger Wirtz
3 years ago
parent
3ad706aaf4
commit
912684b132
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/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com |
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* |
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* Development of this audio library was funded by PJRC.COM, LLC by sales of |
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop |
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* open source software by purchasing Teensy or other PJRC products. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice, development funding notice, and this permission |
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* notice shall be included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include <Arduino.h> |
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#include "mixer8.h" |
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#include "utility/dspinst.h" |
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#if defined(__ARM_ARCH_7EM__) |
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#define MULTI_UNITYGAIN 65536 |
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static void applyGain(int16_t *data, int32_t mult) |
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{ |
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uint32_t *p = (uint32_t *)data; |
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const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES); |
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do { |
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uint32_t tmp32 = *p; // read 2 samples from *data
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int32_t val1 = signed_multiply_32x16b(mult, tmp32); |
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int32_t val2 = signed_multiply_32x16t(mult, tmp32); |
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val1 = signed_saturate_rshift(val1, 16, 0); |
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val2 = signed_saturate_rshift(val2, 16, 0); |
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*p++ = pack_16b_16b(val2, val1); |
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} while (p < end); |
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} |
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static void applyGainThenAdd(int16_t *data, const int16_t *in, int32_t mult) |
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{ |
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uint32_t *dst = (uint32_t *)data; |
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const uint32_t *src = (uint32_t *)in; |
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const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES); |
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if (mult == MULTI_UNITYGAIN) { |
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do { |
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uint32_t tmp32 = *dst; |
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*dst++ = signed_add_16_and_16(tmp32, *src++); |
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tmp32 = *dst; |
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*dst++ = signed_add_16_and_16(tmp32, *src++); |
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} while (dst < end); |
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} else { |
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do { |
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uint32_t tmp32 = *src++; // read 2 samples from *data
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int32_t val1 = signed_multiply_32x16b(mult, tmp32); |
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int32_t val2 = signed_multiply_32x16t(mult, tmp32); |
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val1 = signed_saturate_rshift(val1, 16, 0); |
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val2 = signed_saturate_rshift(val2, 16, 0); |
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tmp32 = pack_16b_16b(val2, val1); |
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uint32_t tmp32b = *dst; |
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*dst++ = signed_add_16_and_16(tmp32, tmp32b); |
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} while (dst < end); |
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} |
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} |
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#elif defined(KINETISL) |
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#define MULTI_UNITYGAIN 256 |
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static void applyGain(int16_t *data, int32_t mult) |
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{ |
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const int16_t *end = data + AUDIO_BLOCK_SAMPLES; |
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do { |
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int32_t val = *data * mult; |
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*data++ = signed_saturate_rshift(val, 16, 0); |
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} while (data < end); |
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} |
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static void applyGainThenAdd(int16_t *dst, const int16_t *src, int32_t mult) |
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{ |
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const int16_t *end = dst + AUDIO_BLOCK_SAMPLES; |
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if (mult == MULTI_UNITYGAIN) { |
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do { |
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int32_t val = *dst + *src++; |
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*dst++ = signed_saturate_rshift(val, 16, 0); |
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} while (dst < end); |
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} else { |
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do { |
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int32_t val = *dst + ((*src++ * mult) >> 8); // overflow possible??
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*dst++ = signed_saturate_rshift(val, 16, 0); |
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} while (dst < end); |
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} |
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} |
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#endif |
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void AudioMixer8::update(void) |
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{ |
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audio_block_t *in, *out=NULL; |
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unsigned int channel; |
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for (channel=0; channel < 8; channel++) { |
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if (!out) { |
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out = receiveWritable(channel); |
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if (out) { |
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int32_t mult = multiplier[channel]; |
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if (mult != MULTI_UNITYGAIN) applyGain(out->data, mult); |
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} |
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} else { |
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in = receiveReadOnly(channel); |
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if (in) { |
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applyGainThenAdd(out->data, in->data, multiplier[channel]); |
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release(in); |
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} |
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} |
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} |
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if (out) { |
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transmit(out); |
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release(out); |
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} |
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} |
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@ -1,69 +0,0 @@ |
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/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com |
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* |
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* Development of this audio library was funded by PJRC.COM, LLC by sales of |
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop |
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* open source software by purchasing Teensy or other PJRC products. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice, development funding notice, and this permission |
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* notice shall be included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#ifndef mixer8_h_ |
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#define mixer8_h_ |
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#include "Arduino.h" |
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#include "AudioStream.h" |
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class AudioMixer8 : public AudioStream |
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{ |
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#if defined(__ARM_ARCH_7EM__) |
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public: |
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AudioMixer8(void) : AudioStream(8, inputQueueArray) { |
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for (int i=0; i<8; i++) multiplier[i] = 65536; |
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} |
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virtual void update(void); |
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void gain(unsigned int channel, float gain) { |
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if (channel >= 8) return; |
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if (gain > 32767.0f) gain = 32767.0f; |
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else if (gain < -32767.0f) gain = -32767.0f; |
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multiplier[channel] = gain * 65536.0f; // TODO: proper roundoff?
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} |
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private: |
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int32_t multiplier[8]; |
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audio_block_t *inputQueueArray[8]; |
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#elif defined(KINETISL) |
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public: |
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AudioMixer8(void) : AudioStream(8, inputQueueArray) { |
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for (int i=0; i<8; i++) multiplier[i] = 256; |
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} |
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virtual void update(void); |
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void gain(unsigned int channel, float gain) { |
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if (channel >= 8) return; |
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if (gain > 127.0f) gain = 127.0f; |
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else if (gain < -127.0f) gain = -127.0f; |
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multiplier[channel] = gain * 256.0f; // TODO: proper roundoff?
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} |
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private: |
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int16_t multiplier[8]; |
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audio_block_t *inputQueueArray[8]; |
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#endif |
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}; |
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#endif |
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