449 lines
12 KiB
C++
449 lines
12 KiB
C++
/* Teensyduino Core Library
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2017 PJRC.COM, LLC.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* 1. The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* 2. If the Software is incorporated into a build system that allows
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* selection among a list of target devices, then similar target
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* devices manufactured by PJRC.COM must be included in the list of
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* target devices and selectable in the same manner.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <Arduino.h>
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#include "usb_dev.h"
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#ifdef AUDIO_INTERFACE // defined by usb_dev.h -> usb_desc.h
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#if F_CPU >= 20000000
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// Uncomment this to work around a limitation in Macintosh adaptive rates
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// This is not a perfect solution. Details here:
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// https://forum.pjrc.com/threads/34855-Distorted-audio-when-using-USB-input-on-Teensy-3-1
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//#define MACOSX_ADAPTIVE_LIMIT
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bool AudioInputUSB::update_responsibility;
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audio_block_t * AudioInputUSB::incoming_left;
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audio_block_t * AudioInputUSB::incoming_right;
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audio_block_t * AudioInputUSB::ready_left;
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audio_block_t * AudioInputUSB::ready_right;
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uint16_t AudioInputUSB::incoming_count;
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uint8_t AudioInputUSB::receive_flag;
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struct usb_audio_features_struct AudioInputUSB::features = {0,0,FEATURE_MAX_VOLUME/2};
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#define DMABUFATTR __attribute__ ((section(".dmabuffers"), aligned (4)))
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uint16_t usb_audio_receive_buffer[AUDIO_RX_SIZE/2] DMABUFATTR;
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uint32_t usb_audio_sync_feedback DMABUFATTR;
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uint8_t usb_audio_receive_setting=0;
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static uint32_t feedback_accumulator = 185042824;
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void AudioInputUSB::begin(void)
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{
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incoming_count = 0;
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incoming_left = NULL;
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incoming_right = NULL;
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ready_left = NULL;
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ready_right = NULL;
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receive_flag = 0;
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// update_responsibility = update_setup();
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// TODO: update responsibility is tough, partly because the USB
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// interrupts aren't sychronous to the audio library block size,
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// but also because the PC may stop transmitting data, which
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// means we no longer get receive callbacks from usb_dev.
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update_responsibility = false;
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usb_audio_sync_feedback = feedback_accumulator >> 8;
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}
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static void copy_to_buffers(const uint32_t *src, int16_t *left, int16_t *right, unsigned int len)
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{
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uint32_t *target = (uint32_t*) src + len;
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while ((src < target) && (((uintptr_t) left & 0x02) != 0)) {
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uint32_t n = *src++;
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*left++ = n & 0xFFFF;
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*right++ = n >> 16;
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}
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while ((src < target - 2)) {
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uint32_t n1 = *src++;
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uint32_t n = *src++;
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*(uint32_t *)left = (n1 & 0xFFFF) | ((n & 0xFFFF) << 16);
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left+=2;
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*(uint32_t *)right = (n1 >> 16) | ((n & 0xFFFF0000)) ;
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right+=2;
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}
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while ((src < target)) {
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uint32_t n = *src++;
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*left++ = n & 0xFFFF;
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*right++ = n >> 16;
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}
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}
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// Called from the USB interrupt when an isochronous packet arrives
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// we must completely remove it from the receive buffer before returning
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//
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void usb_audio_receive_callback(unsigned int len)
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{
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unsigned int count, avail;
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audio_block_t *left, *right;
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const uint32_t *data;
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AudioInputUSB::receive_flag = 1;
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len >>= 2; // 1 sample = 4 bytes: 2 left, 2 right
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data = (const uint32_t *)usb_audio_receive_buffer;
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count = AudioInputUSB::incoming_count;
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left = AudioInputUSB::incoming_left;
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right = AudioInputUSB::incoming_right;
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if (left == NULL) {
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left = AudioStream::allocate();
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if (left == NULL) return;
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AudioInputUSB::incoming_left = left;
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}
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if (right == NULL) {
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right = AudioStream::allocate();
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if (right == NULL) return;
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AudioInputUSB::incoming_right = right;
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}
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while (len > 0) {
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avail = AUDIO_BLOCK_SAMPLES - count;
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if (len < avail) {
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copy_to_buffers(data, left->data + count, right->data + count, len);
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AudioInputUSB::incoming_count = count + len;
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return;
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} else if (avail > 0) {
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copy_to_buffers(data, left->data + count, right->data + count, avail);
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data += avail;
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len -= avail;
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if (AudioInputUSB::ready_left || AudioInputUSB::ready_right) {
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// buffer overrun, PC sending too fast
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AudioInputUSB::incoming_count = count + avail;
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//if (len > 0) {
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//serial_print("!");
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//serial_phex(len);
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//}
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return;
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}
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send:
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AudioInputUSB::ready_left = left;
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AudioInputUSB::ready_right = right;
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//if (AudioInputUSB::update_responsibility) AudioStream::update_all();
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left = AudioStream::allocate();
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if (left == NULL) {
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AudioInputUSB::incoming_left = NULL;
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AudioInputUSB::incoming_right = NULL;
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AudioInputUSB::incoming_count = 0;
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return;
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}
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right = AudioStream::allocate();
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if (right == NULL) {
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AudioStream::release(left);
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AudioInputUSB::incoming_left = NULL;
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AudioInputUSB::incoming_right = NULL;
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AudioInputUSB::incoming_count = 0;
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return;
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}
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AudioInputUSB::incoming_left = left;
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AudioInputUSB::incoming_right = right;
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count = 0;
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} else {
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if (AudioInputUSB::ready_left || AudioInputUSB::ready_right) return;
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goto send; // recover from buffer overrun
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}
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}
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AudioInputUSB::incoming_count = count;
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}
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void AudioInputUSB::update(void)
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{
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audio_block_t *left, *right;
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__disable_irq();
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left = ready_left;
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ready_left = NULL;
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right = ready_right;
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ready_right = NULL;
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uint16_t c = incoming_count;
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uint8_t f = receive_flag;
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receive_flag = 0;
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__enable_irq();
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if (f) {
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int diff = AUDIO_BLOCK_SAMPLES/2 - (int)c;
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feedback_accumulator += diff / 3;
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uint32_t feedback = (feedback_accumulator >> 8) + diff * 100;
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#ifdef MACOSX_ADAPTIVE_LIMIT
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if (feedback > 722698) feedback = 722698;
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#endif
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usb_audio_sync_feedback = feedback;
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//if (diff > 0) {
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//serial_print(".");
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//} else if (diff < 0) {
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//serial_print("^");
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//}
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}
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//serial_phex(c);
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//serial_print(".");
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if (!left || !right) {
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//serial_print("#"); // buffer underrun - PC sending too slow
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//if (f) feedback_accumulator += 10 << 8;
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}
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if (left) {
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transmit(left, 0);
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release(left);
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}
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if (right) {
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transmit(right, 1);
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release(right);
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}
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}
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bool AudioOutputUSB::update_responsibility;
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audio_block_t * AudioOutputUSB::left_1st;
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audio_block_t * AudioOutputUSB::left_2nd;
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audio_block_t * AudioOutputUSB::right_1st;
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audio_block_t * AudioOutputUSB::right_2nd;
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uint16_t AudioOutputUSB::offset_1st;
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uint16_t usb_audio_transmit_buffer[AUDIO_TX_SIZE/2] DMABUFATTR;
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uint8_t usb_audio_transmit_setting=0;
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void AudioOutputUSB::begin(void)
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{
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update_responsibility = false;
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left_1st = NULL;
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right_1st = NULL;
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}
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static void copy_from_buffers(uint32_t *dst, int16_t *left, int16_t *right, unsigned int len)
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{
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// TODO: optimize...
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while (len > 0) {
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*dst++ = (*right++ << 16) | (*left++ & 0xFFFF);
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len--;
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}
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}
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void AudioOutputUSB::update(void)
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{
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audio_block_t *left, *right;
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// TODO: we shouldn't be writing to these......
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//left = receiveReadOnly(0); // input 0 = left channel
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//right = receiveReadOnly(1); // input 1 = right channel
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left = receiveWritable(0); // input 0 = left channel
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right = receiveWritable(1); // input 1 = right channel
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if (usb_audio_transmit_setting == 0) {
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if (left) release(left);
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if (right) release(right);
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if (left_1st) { release(left_1st); left_1st = NULL; }
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if (left_2nd) { release(left_2nd); left_2nd = NULL; }
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if (right_1st) { release(right_1st); right_1st = NULL; }
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if (right_2nd) { release(right_2nd); right_2nd = NULL; }
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offset_1st = 0;
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return;
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}
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if (left == NULL) {
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left = allocate();
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if (left == NULL) {
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if (right) release(right);
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return;
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}
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memset(left->data, 0, sizeof(left->data));
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}
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if (right == NULL) {
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right = allocate();
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if (right == NULL) {
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release(left);
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return;
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}
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memset(right->data, 0, sizeof(right->data));
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}
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__disable_irq();
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if (left_1st == NULL) {
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left_1st = left;
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right_1st = right;
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offset_1st = 0;
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} else if (left_2nd == NULL) {
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left_2nd = left;
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right_2nd = right;
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} else {
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// buffer overrun - PC is consuming too slowly
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audio_block_t *discard1 = left_1st;
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left_1st = left_2nd;
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left_2nd = left;
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audio_block_t *discard2 = right_1st;
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right_1st = right_2nd;
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right_2nd = right;
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offset_1st = 0; // TODO: discard part of this data?
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//serial_print("*");
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release(discard1);
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release(discard2);
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}
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__enable_irq();
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}
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// Called from the USB interrupt when ready to transmit another
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// isochronous packet. If we place data into the transmit buffer,
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// the return is the number of bytes. Otherwise, return 0 means
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// no data to transmit
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unsigned int usb_audio_transmit_callback(void)
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{
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static uint32_t count=5;
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uint32_t avail, num, target, offset, len=0;
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audio_block_t *left, *right;
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if (++count < 9) { // TODO: dynamic adjust to match USB rate
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target = 44;
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} else {
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count = 0;
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target = 45;
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}
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while (len < target) {
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num = target - len;
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left = AudioOutputUSB::left_1st;
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if (left == NULL) {
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// buffer underrun - PC is consuming too quickly
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memset(usb_audio_transmit_buffer + len, 0, num * 4);
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//serial_print("%");
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break;
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}
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right = AudioOutputUSB::right_1st;
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offset = AudioOutputUSB::offset_1st;
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avail = AUDIO_BLOCK_SAMPLES - offset;
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if (num > avail) num = avail;
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copy_from_buffers((uint32_t *)usb_audio_transmit_buffer + len,
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left->data + offset, right->data + offset, num);
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len += num;
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offset += num;
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if (offset >= AUDIO_BLOCK_SAMPLES) {
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AudioStream::release(left);
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AudioStream::release(right);
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AudioOutputUSB::left_1st = AudioOutputUSB::left_2nd;
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AudioOutputUSB::left_2nd = NULL;
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AudioOutputUSB::right_1st = AudioOutputUSB::right_2nd;
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AudioOutputUSB::right_2nd = NULL;
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AudioOutputUSB::offset_1st = 0;
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} else {
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AudioOutputUSB::offset_1st = offset;
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}
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}
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return target * 4;
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}
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struct setup_struct {
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union {
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struct {
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uint8_t bmRequestType;
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uint8_t bRequest;
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union {
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struct {
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uint8_t bChannel; // 0=main, 1=left, 2=right
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uint8_t bCS; // Control Selector
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};
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uint16_t wValue;
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};
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union {
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struct {
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uint8_t bIfEp; // type of entity
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uint8_t bEntityId; // UnitID, TerminalID, etc.
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};
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uint16_t wIndex;
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};
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uint16_t wLength;
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};
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};
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};
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int usb_audio_get_feature(void *stp, uint8_t *data, uint32_t *datalen)
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{
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struct setup_struct setup = *((struct setup_struct *)stp);
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if (setup.bmRequestType==0xA1) { // should check bRequest, bChannel, and UnitID
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if (setup.bCS==0x01) { // mute
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data[0] = AudioInputUSB::features.mute; // 1=mute, 0=unmute
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*datalen = 1;
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return 1;
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}
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else if (setup.bCS==0x02) { // volume
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if (setup.bRequest==0x81) { // GET_CURR
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data[0] = AudioInputUSB::features.volume & 0xFF;
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data[1] = (AudioInputUSB::features.volume>>8) & 0xFF;
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}
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else if (setup.bRequest==0x82) { // GET_MIN
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//serial_print("vol get_min\n");
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data[0] = 0; // min level is 0
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data[1] = 0;
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}
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else if (setup.bRequest==0x83) { // GET_MAX
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data[0] = FEATURE_MAX_VOLUME & 0xFF; // max level, for range of 0 to MAX
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data[1] = (FEATURE_MAX_VOLUME>>8) & 0x0F;
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}
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else if (setup.bRequest==0x84) { // GET_RES
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data[0] = 1; // increment vol by by 1
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data[1] = 0;
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}
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else { // pass over SET_MEM, etc.
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return 0;
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}
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*datalen = 2;
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return 1;
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}
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}
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return 0;
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}
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int usb_audio_set_feature(void *stp, uint8_t *buf)
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{
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struct setup_struct setup = *((struct setup_struct *)stp);
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if (setup.bmRequestType==0x21) { // should check bRequest, bChannel and UnitID
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if (setup.bCS==0x01) { // mute
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if (setup.bRequest==0x01) { // SET_CUR
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AudioInputUSB::features.mute = buf[0]; // 1=mute,0=unmute
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AudioInputUSB::features.change = 1;
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return 1;
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}
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}
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else if (setup.bCS==0x02) { // volume
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if (setup.bRequest==0x01) { // SET_CUR
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AudioInputUSB::features.volume = buf[0] + (buf[1]<<8);
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AudioInputUSB::features.change = 1;
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return 1;
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}
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}
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}
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return 0;
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}
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#endif // F_CPU
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#endif // AUDIO_INTERFACE
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