/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* 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:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* 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 "play_memory.h"
#include "utility/dspinst.h"
void AudioPlayMemory::play(const unsigned int *data)
{
uint32_t format;
playing = 0;
prior = 0;
format = *data++;
next = data;
beginning = data;
length = format & 0xFFFFFF;
playing = format >> 24;
}
void AudioPlayMemory::stop(void)
{
playing = 0;
}
extern "C" {
extern const int16_t ulaw_decode_table[256];
};
void AudioPlayMemory::update(void)
{
audio_block_t *block;
const unsigned int *in;
int16_t *out;
uint32_t tmp32, consumed;
int16_t s0, s1, s2, s3, s4;
int i;
if (!playing) return;
block = allocate();
if (block == NULL) return;
//Serial.write('.');
out = block->data;
in = next;
s0 = prior;
switch (playing) {
case 0x01: // u-law encoded, 44100 Hz
for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 4) {
tmp32 = *in++;
*out++ = ulaw_decode_table[(tmp32 >> 0) & 255];
*out++ = ulaw_decode_table[(tmp32 >> 8) & 255];
*out++ = ulaw_decode_table[(tmp32 >> 16) & 255];
*out++ = ulaw_decode_table[(tmp32 >> 24) & 255];
}
consumed = 128;
break;
case 0x81: // 16 bit PCM, 44100 Hz
for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 2) {
tmp32 = *in++;
*out++ = (int16_t)(tmp32 & 65535);
*out++ = (int16_t)(tmp32 >> 16);
}
consumed = 128;
break;
case 0x02: // u-law encoded, 22050 Hz
for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 8) {
tmp32 = *in++;
s1 = ulaw_decode_table[(tmp32 >> 0) & 255];
s2 = ulaw_decode_table[(tmp32 >> 8) & 255];
s3 = ulaw_decode_table[(tmp32 >> 16) & 255];
s4 = ulaw_decode_table[(tmp32 >> 24) & 255];
*out++ = (s0 + s1) >> 1;
*out++ = s1;
*out++ = (s1 + s2) >> 1;
*out++ = s2;
*out++ = (s2 + s3) >> 1;
*out++ = s3;
*out++ = (s3 + s4) >> 1;
*out++ = s4;
s0 = s4;
}
consumed = 64;
break;
case 0x82: // 16 bits PCM, 22050 Hz
for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 4) {
tmp32 = *in++;
s1 = (int16_t)(tmp32 & 65535);
s2 = (int16_t)(tmp32 >> 16);
*out++ = (s0 + s1) >> 1;
*out++ = s1;
*out++ = (s1 + s2) >> 1;
*out++ = s2;
s0 = s2;
}
consumed = 64;
break;
case 0x03: // u-law encoded, 11025 Hz
for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 16) {
tmp32 = *in++;
s1 = ulaw_decode_table[(tmp32 >> 0) & 255];
s2 = ulaw_decode_table[(tmp32 >> 8) & 255];
s3 = ulaw_decode_table[(tmp32 >> 16) & 255];
s4 = ulaw_decode_table[(tmp32 >> 24) & 255];
*out++ = (s0 * 3 + s1) >> 2;
*out++ = (s0 + s1) >> 1;
*out++ = (s0 + s1 * 3) >> 2;
*out++ = s1;
*out++ = (s1 * 3 + s2) >> 2;
*out++ = (s1 + s2) >> 1;
*out++ = (s1 + s2 * 3) >> 2;
*out++ = s2;
*out++ = (s2 * 3 + s3) >> 2;
*out++ = (s2 + s3) >> 1;
*out++ = (s2 + s3 * 3) >> 2;
*out++ = s3;
*out++ = (s3 * 3 + s4) >> 2;
*out++ = (s3 + s4) >> 1;
*out++ = (s3 + s4 * 3) >> 2;
*out++ = s4;
s0 = s4;
}
consumed = 32;
break;
case 0x83: // 16 bit PCM, 11025 Hz
for (i=0; i < AUDIO_BLOCK_SAMPLES; i += 8) {
tmp32 = *in++;
s1 = (int16_t)(tmp32 & 65535);
s2 = (int16_t)(tmp32 >> 16);
*out++ = (s0 * 3 + s1) >> 2;
*out++ = (s0 + s1) >> 1;
*out++ = (s0 + s1 * 3) >> 2;
*out++ = s1;
*out++ = (s1 * 3 + s2) >> 2;
*out++ = (s1 + s2) >> 1;
*out++ = (s1 + s2 * 3) >> 2;
*out++ = s2;
s0 = s2;
}
consumed = 32;
break;
default:
release(block);
playing = 0;
return;
}
prior = s0;
next = in;
if (length > consumed) {
length -= consumed;
} else {
playing = 0;
}
transmit(block);
release(block);
}
#define B2M_88200 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT / 2.0)
#define B2M_44100 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT) // 97352592
#define B2M_22050 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT * 2.0)
#define B2M_11025 (uint32_t)((double)4294967296000.0 / AUDIO_SAMPLE_RATE_EXACT * 4.0)
uint32_t AudioPlayMemory::positionMillis(void)
{
uint8_t p;
const uint8_t *n, *b;
uint32_t b2m;
__disable_irq();
p = playing;
n = (const uint8_t *)next;
b = (const uint8_t *)beginning;
__enable_irq();
switch (p) {
case 0x81: // 16 bit PCM, 44100 Hz
b2m = B2M_88200; break;
case 0x01: // u-law encoded, 44100 Hz
case 0x82: // 16 bits PCM, 22050 Hz
b2m = B2M_44100; break;
case 0x02: // u-law encoded, 22050 Hz
case 0x83: // 16 bit PCM, 11025 Hz
b2m = B2M_22050; break;
case 0x03: // u-law encoded, 11025 Hz
b2m = B2M_11025; break;
default:
return 0;
}
if (p == 0) return 0;
return ((uint64_t)(n - b) * b2m) >> 32;
}
uint32_t AudioPlayMemory::lengthMillis(void)
{
uint8_t p;
const uint32_t *b;
uint32_t b2m;
__disable_irq();
p = playing;
b = (const uint32_t *)beginning;
__enable_irq();
switch (p) {
case 0x81: // 16 bit PCM, 44100 Hz
case 0x01: // u-law encoded, 44100 Hz
b2m = B2M_44100; break;
case 0x82: // 16 bits PCM, 22050 Hz
case 0x02: // u-law encoded, 22050 Hz
b2m = B2M_22050; break;
case 0x83: // 16 bit PCM, 11025 Hz
case 0x03: // u-law encoded, 11025 Hz
b2m = B2M_11025; break;
default:
return 0;
}
return ((uint64_t)(*(b - 1) & 0xFFFFFF) * b2m) >> 32;
}