253 lines
6.5 KiB
C++
Executable file
253 lines
6.5 KiB
C++
Executable file
/* 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 "play_memory.h"
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#include "utility/dspinst.h"
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void AudioPlayMemory::play(const unsigned int *data)
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{
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uint32_t format;
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playing = 0;
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prior = 0;
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format = *data++;
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next = data;
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beginning = data;
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length = format & 0xFFFFFF;
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playing = format >> 24;
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}
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void AudioPlayMemory::stop(void)
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{
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playing = 0;
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}
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extern "C" {
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extern const int16_t ulaw_decode_table[256];
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};
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void AudioPlayMemory::update(void)
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{
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audio_block_t *block;
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const unsigned int *in;
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int16_t *out;
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uint32_t tmp32, consumed;
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int16_t s0, s1, s2, s3, s4;
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int i;
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if (!playing) return;
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block = allocate();
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if (block == NULL) return;
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//Serial.write('.');
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out = block->data;
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in = next;
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s0 = prior;
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switch (playing) {
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case 0x01: // u-law encoded, 44100 Hz
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for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 4) {
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tmp32 = *in++;
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*out++ = ulaw_decode_table[(tmp32 >> 0) & 255];
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*out++ = ulaw_decode_table[(tmp32 >> 8) & 255];
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*out++ = ulaw_decode_table[(tmp32 >> 16) & 255];
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*out++ = ulaw_decode_table[(tmp32 >> 24) & 255];
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}
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consumed = AUDIO_BLOCK_SAMPLES;
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break;
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case 0x81: // 16 bit PCM, 44100 Hz
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for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 2) {
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tmp32 = *in++;
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*out++ = (int16_t)(tmp32 & 65535);
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*out++ = (int16_t)(tmp32 >> 16);
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}
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consumed = AUDIO_BLOCK_SAMPLES;
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break;
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case 0x02: // u-law encoded, 22050 Hz
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for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 8) {
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tmp32 = *in++;
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s1 = ulaw_decode_table[(tmp32 >> 0) & 255];
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s2 = ulaw_decode_table[(tmp32 >> 8) & 255];
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s3 = ulaw_decode_table[(tmp32 >> 16) & 255];
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s4 = ulaw_decode_table[(tmp32 >> 24) & 255];
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*out++ = (s0 + s1) >> 1;
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*out++ = s1;
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*out++ = (s1 + s2) >> 1;
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*out++ = s2;
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*out++ = (s2 + s3) >> 1;
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*out++ = s3;
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*out++ = (s3 + s4) >> 1;
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*out++ = s4;
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s0 = s4;
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}
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consumed = AUDIO_BLOCK_SAMPLES/2;
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break;
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case 0x82: // 16 bits PCM, 22050 Hz
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for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 4) {
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tmp32 = *in++;
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s1 = (int16_t)(tmp32 & 65535);
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s2 = (int16_t)(tmp32 >> 16);
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*out++ = (s0 + s1) >> 1;
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*out++ = s1;
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*out++ = (s1 + s2) >> 1;
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*out++ = s2;
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s0 = s2;
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}
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consumed = AUDIO_BLOCK_SAMPLES/2;
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break;
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case 0x03: // u-law encoded, 11025 Hz
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for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 16) {
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tmp32 = *in++;
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s1 = ulaw_decode_table[(tmp32 >> 0) & 255];
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s2 = ulaw_decode_table[(tmp32 >> 8) & 255];
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s3 = ulaw_decode_table[(tmp32 >> 16) & 255];
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s4 = ulaw_decode_table[(tmp32 >> 24) & 255];
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*out++ = (s0 * 3 + s1) >> 2;
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*out++ = (s0 + s1) >> 1;
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*out++ = (s0 + s1 * 3) >> 2;
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*out++ = s1;
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*out++ = (s1 * 3 + s2) >> 2;
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*out++ = (s1 + s2) >> 1;
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*out++ = (s1 + s2 * 3) >> 2;
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*out++ = s2;
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*out++ = (s2 * 3 + s3) >> 2;
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*out++ = (s2 + s3) >> 1;
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*out++ = (s2 + s3 * 3) >> 2;
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*out++ = s3;
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*out++ = (s3 * 3 + s4) >> 2;
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*out++ = (s3 + s4) >> 1;
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*out++ = (s3 + s4 * 3) >> 2;
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*out++ = s4;
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s0 = s4;
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}
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consumed = AUDIO_BLOCK_SAMPLES/4;
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break;
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case 0x83: // 16 bit PCM, 11025 Hz
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for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 8) {
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tmp32 = *in++;
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s1 = (int16_t)(tmp32 & 65535);
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s2 = (int16_t)(tmp32 >> 16);
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*out++ = (s0 * 3 + s1) >> 2;
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*out++ = (s0 + s1) >> 1;
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*out++ = (s0 + s1 * 3) >> 2;
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*out++ = s1;
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*out++ = (s1 * 3 + s2) >> 2;
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*out++ = (s1 + s2) >> 1;
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*out++ = (s1 + s2 * 3) >> 2;
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*out++ = s2;
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s0 = s2;
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}
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consumed = AUDIO_BLOCK_SAMPLES/4;
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break;
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default:
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release(block);
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playing = 0;
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return;
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}
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prior = s0;
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next = in;
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if (length > consumed) {
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length -= consumed;
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} else {
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playing = 0;
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}
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transmit(block);
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release(block);
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}
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#define B2M_88200 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT / 2.0)
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#define B2M_44100 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT) // 97352592
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#define B2M_22050 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT * 2.0)
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#define B2M_11025 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT * 4.0)
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uint32_t AudioPlayMemory::positionMillis(void)
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{
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uint8_t p;
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const uint8_t *n, *b;
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uint32_t b2m;
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__disable_irq();
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p = playing;
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n = (const uint8_t *)next;
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b = (const uint8_t *)beginning;
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__enable_irq();
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switch (p) {
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case 0x81: // 16 bit PCM, 44100 Hz
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b2m = B2M_88200; break;
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case 0x01: // u-law encoded, 44100 Hz
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case 0x82: // 16 bits PCM, 22050 Hz
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b2m = B2M_44100; break;
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case 0x02: // u-law encoded, 22050 Hz
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case 0x83: // 16 bit PCM, 11025 Hz
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b2m = B2M_22050; break;
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case 0x03: // u-law encoded, 11025 Hz
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b2m = B2M_11025; break;
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default:
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return 0;
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}
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if (p == 0) return 0;
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return ((uint64_t)(n - b) * b2m) >> 32;
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}
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uint32_t AudioPlayMemory::lengthMillis(void)
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{
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uint8_t p;
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const uint32_t *b;
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uint32_t b2m;
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__disable_irq();
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p = playing;
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b = (const uint32_t *)beginning;
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__enable_irq();
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switch (p) {
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case 0x81: // 16 bit PCM, 44100 Hz
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case 0x01: // u-law encoded, 44100 Hz
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b2m = B2M_44100; break;
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case 0x82: // 16 bits PCM, 22050 Hz
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case 0x02: // u-law encoded, 22050 Hz
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b2m = B2M_22050; break;
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case 0x83: // 16 bit PCM, 11025 Hz
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case 0x03: // u-law encoded, 11025 Hz
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b2m = B2M_11025; break;
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default:
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return 0;
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}
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return ((uint64_t)(*(b - 1) & 0xFFFFFF) * b2m) >> 32;
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}
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