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AudioStream.cpp
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AudioStream.cpp
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/* Teensyduino Core Library
* http://www.pjrc.com/teensy/
* Copyright (c) 2017 PJRC.COM, LLC.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* 1. The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* 2. If the Software is incorporated into a build system that allows
* selection among a list of target devices, then similar target
* devices manufactured by PJRC.COM must be included in the list of
* target devices and selectable in the same manner.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Arduino.h>
#include "AudioStream.h"
#if defined(__MKL26Z64__)
#define MAX_AUDIO_MEMORY 6144
#elif defined(__MK20DX128__)
#define MAX_AUDIO_MEMORY 12288
#elif defined(__MK20DX256__)
#define MAX_AUDIO_MEMORY 49152
#elif defined(__MK64FX512__)
#define MAX_AUDIO_MEMORY 163840
#elif defined(__MK66FX1M0__)
#define MAX_AUDIO_MEMORY 229376
#elif defined(__SAMD51__)
#define MAX_AUDIO_MEMORY 229376
#endif
#define NUM_MASKS (((MAX_AUDIO_MEMORY / AUDIO_BLOCK_SAMPLES / 2) + 31) / 32)
audio_block_t * AudioStream::memory_pool;
uint32_t AudioStream::memory_pool_available_mask[NUM_MASKS];
uint16_t AudioStream::memory_pool_first_mask;
uint16_t AudioStream::cpu_cycles_total = 0;
uint16_t AudioStream::cpu_cycles_total_max = 0;
uint16_t AudioStream::memory_used = 0;
uint16_t AudioStream::memory_used_max = 0;
// Set up the pool of audio data blocks
// placing them all onto the free list
void AudioStream::initialize_memory(audio_block_t *data, unsigned int num)
{
unsigned int i;
unsigned int maxnum = MAX_AUDIO_MEMORY / AUDIO_BLOCK_SAMPLES / 2;
//Serial.println("AudioStream initialize_memory");
//delay(10);
if (num > maxnum) num = maxnum;
__disable_irq();
memory_pool = data;
memory_pool_first_mask = 0;
for (i=0; i < NUM_MASKS; i++) {
memory_pool_available_mask[i] = 0;
}
for (i=0; i < num; i++) {
memory_pool_available_mask[i >> 5] |= (1 << (i & 0x1F));
}
for (i=0; i < num; i++) {
data[i].memory_pool_index = i;
}
__enable_irq();
}
// Allocate 1 audio data block. If successful
// the caller is the only owner of this new block
audio_block_t * AudioStream::allocate(void)
{
uint32_t n, index, avail;
uint32_t *p, *end;
audio_block_t *block;
uint32_t used;
p = memory_pool_available_mask;
end = p + NUM_MASKS;
__disable_irq();
index = memory_pool_first_mask;
p += index;
while (1) {
if (p >= end) {
__enable_irq();
//Serial.println("alloc:null");
return NULL;
}
avail = *p;
if (avail) break;
index++;
p++;
}
n = __builtin_clz(avail);
avail &= ~(0x80000000 >> n);
*p = avail;
if (!avail) index++;
memory_pool_first_mask = index;
used = memory_used + 1;
memory_used = used;
__enable_irq();
index = p - memory_pool_available_mask;
block = memory_pool + ((index << 5) + (31 - n));
block->ref_count = 1;
if (used > memory_used_max) memory_used_max = used;
//Serial.print("alloc:");
//Serial.println((uint32_t)block, HEX);
return block;
}
// Release ownership of a data block. If no
// other streams have ownership, the block is
// returned to the free pool
void AudioStream::release(audio_block_t *block)
{
//if (block == NULL) return;
uint32_t mask = (0x80000000 >> (31 - (block->memory_pool_index & 0x1F)));
uint32_t index = block->memory_pool_index >> 5;
__disable_irq();
if (block->ref_count > 1) {
block->ref_count--;
} else {
//Serial.print("reles:");
//Serial.println((uint32_t)block, HEX);
memory_pool_available_mask[index] |= mask;
if (index < memory_pool_first_mask) memory_pool_first_mask = index;
memory_used--;
}
__enable_irq();
}
// Transmit an audio data block
// to all streams that connect to an output. The block
// becomes owned by all the recepients, but also is still
// owned by this object. Normally, a block must be released
// by the caller after it's transmitted. This allows the
// caller to transmit to same block to more than 1 output,
// and then release it once after all transmit calls.
void AudioStream::transmit(audio_block_t *block, unsigned char index)
{
for (AudioConnection *c = destination_list; c != NULL; c = c->next_dest) {
if (c->src_index == index) {
if (c->dst.inputQueue[c->dest_index] == NULL) {
c->dst.inputQueue[c->dest_index] = block;
block->ref_count++;
}
}
}
}
// Receive block from an input. The block's data
// may be shared with other streams, so it must not be written
audio_block_t * AudioStream::receiveReadOnly(unsigned int index)
{
audio_block_t *in;
if (index >= num_inputs) return NULL;
in = inputQueue[index];
inputQueue[index] = NULL;
return in;
}
// Receive block from an input. The block will not
// be shared, so its contents may be changed.
audio_block_t * AudioStream::receiveWritable(unsigned int index)
{
audio_block_t *in, *p;
if (index >= num_inputs) return NULL;
in = inputQueue[index];
inputQueue[index] = NULL;
if (in && in->ref_count > 1) {
p = allocate();
if (p) memcpy(p->data, in->data, sizeof(p->data));
in->ref_count--;
in = p;
}
return in;
}
void AudioConnection::connect(void)
{
AudioConnection *p;
if (isConnected) return;
if (dest_index > dst.num_inputs) return;
__disable_irq();
p = src.destination_list;
if (p == NULL) {
src.destination_list = this;
} else {
while (p->next_dest) {
if (&p->src == &this->src && &p->dst == &this->dst
&& p->src_index == this->src_index && p->dest_index == this->dest_index) {
//Source and destination already connected through another connection, abort
__enable_irq();
return;
}
p = p->next_dest;
}
p->next_dest = this;
}
this->next_dest = NULL;
src.numConnections++;
src.active = true;
dst.numConnections++;
dst.active = true;
isConnected = true;
__enable_irq();
}
void AudioConnection::disconnect(void)
{
AudioConnection *p;
if (!isConnected) return;
if (dest_index > dst.num_inputs) return;
__disable_irq();
// Remove destination from source list
p = src.destination_list;
if (p == NULL) {
//>>> PAH re-enable the IRQ
__enable_irq();
return;
} else if (p == this) {
if (p->next_dest) {
src.destination_list = next_dest;
} else {
src.destination_list = NULL;
}
} else {
while (p) {
if (p == this) {
if (p->next_dest) {
p = next_dest;
break;
} else {
p = NULL;
break;
}
}
p = p->next_dest;
}
}
//>>> PAH release the audio buffer properly
//Remove possible pending src block from destination
if(dst.inputQueue[dest_index] != NULL) {
AudioStream::release(dst.inputQueue[dest_index]);
// release() re-enables the IRQ. Need it to be disabled a little longer
__disable_irq();
dst.inputQueue[dest_index] = NULL;
}
//Check if the disconnected AudioStream objects should still be active
src.numConnections--;
if (src.numConnections == 0) {
src.active = false;
}
dst.numConnections--;
if (dst.numConnections == 0) {
dst.active = false;
}
isConnected = false;
__enable_irq();
}
// When an object has taken responsibility for calling update_all()
// at each block interval (approx 2.9ms), this variable is set to
// true. Objects that are capable of calling update_all(), typically
// input and output based on interrupts, must check this variable in
// their constructors.
bool AudioStream::update_scheduled = false;
bool AudioStream::update_setup(void)
{
if (update_scheduled) return false;
NVIC_SET_PRIORITY(IRQ_SOFTWARE, 208); // 255 = lowest priority
NVIC_ENABLE_IRQ(IRQ_SOFTWARE);
update_scheduled = true;
return true;
}
void AudioStream::update_stop(void)
{
NVIC_DISABLE_IRQ(IRQ_SOFTWARE);
update_scheduled = false;
}
AudioStream * AudioStream::first_update = NULL;
void software_isr(void) // AudioStream::update_all()
{
AudioStream *p;
ARM_DEMCR |= ARM_DEMCR_TRCENA;
ARM_DWT_CTRL |= ARM_DWT_CTRL_CYCCNTENA;
uint32_t totalcycles = ARM_DWT_CYCCNT;
//digitalWriteFast(2, HIGH);
for (p = AudioStream::first_update; p; p = p->next_update) {
if (p->active) {
uint32_t cycles = ARM_DWT_CYCCNT;
p->update();
// TODO: traverse inputQueueArray and release
// any input blocks that weren't consumed?
cycles = (ARM_DWT_CYCCNT - cycles) >> 4;
p->cpu_cycles = cycles;
if (cycles > p->cpu_cycles_max) p->cpu_cycles_max = cycles;
}
}
//digitalWriteFast(2, LOW);
totalcycles = (ARM_DWT_CYCCNT - totalcycles) >> 4;;
AudioStream::cpu_cycles_total = totalcycles;
if (totalcycles > AudioStream::cpu_cycles_total_max)
AudioStream::cpu_cycles_total_max = totalcycles;
}
extern "C" {
void SOFTWARE_Handler(void)
{
software_isr();
}
};