mirror of https://github.com/arendst/Tasmota.git
119 lines
3.3 KiB
C++
119 lines
3.3 KiB
C++
/*
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AudioOutput
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Base class of an audio output player
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Copyright (C) 2017 Earle F. Philhower, III
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _AUDIOOUTPUTNULLSLOW_H
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#define _AUDIOOUTPUTNULLSLOW_H
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <linux/soundcard.h>
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#include "AudioOutput.h"
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class AudioOutputNullSlow : public AudioOutput
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{
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public:
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AudioOutputNullSlow() { };
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~AudioOutputNullSlow() {};
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virtual bool begin() { samples = 0; startms = millis(); return true; }
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virtual bool ConsumeSample(int16_t sample[2]) {
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if (fd < 0) {
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fd = open("/dev/dsp", O_RDWR);
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if (fd < 0) {
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perror("open of /dev/dsp failed (Try with 'padsp this-exec')");
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exit(1);
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}
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}
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if (channels && lastchannels != channels) {
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Serial.printf("CHANNELS=%d\n", channels);
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int arg = channels; /* mono or stereo */
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int status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);
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if (status == -1) {
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perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");
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exit(1);
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} else if (arg != channels) {
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perror("unable to set number of channels");
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exit(1);
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}
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lastchannels = channels;
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}
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if (lastchannels > 0 && hertz && lasthertz != hertz) {
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Serial.printf("FREQ=%d\n", hertz);
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int arg = hertz*4/lastchannels; /* sampling rate */
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int status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);
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if (status == -1) {
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perror("SOUND_PCM_WRITE_RATE ioctl failed");
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exit(1);
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}
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lasthertz = hertz;
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}
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if (bps && lastbps != bps) {
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Serial.printf("BPS=%d\n", bps);
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int arg = bps; /* sample size */
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int status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);
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if (status == -1) {
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perror("SOUND_PCM_WRITE_BITS ioctl failed");
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exit(1);
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} else if (arg != bps) {
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perror("unable to set sample size");
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exit(1);
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}
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lastbps = bps;
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}
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if ((++samples & ((1<<9)-1)) == 0) {
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// let the main loop a chance to run
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return false;
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}
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if (write(fd, sample, sizeof(sample)) != sizeof(sample)) {
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perror("doing sound");
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exit(1);
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}
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return true;
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}
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virtual bool stop() { endms = millis(); return true; };
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unsigned long GetMilliseconds() { return endms - startms; }
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int GetSamples() { return samples; }
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int GetFrequency() { return hertz; }
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protected:
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unsigned long startms;
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unsigned long endms;
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int samples;
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int lastchannels = -1;
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int lasthertz = -1;
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int lastbps = -1;
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int fd = -1;
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};
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#endif
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