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StreamOnHost: play audio on host (earlephilhower#359)
* StreamOnHost: actually play audio * (spaces) * fix comment * update message
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* | ||
| AudioOutput | ||
| Base class of an audio output player | ||
| Copyright (C) 2017 Earle F. Philhower, III | ||
| This program is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| #ifndef _AUDIOOUTPUTNULLSLOW_H | ||
| #define _AUDIOOUTPUTNULLSLOW_H | ||
|
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||
| #include <unistd.h> | ||
| #include <fcntl.h> | ||
| #include <sys/types.h> | ||
| #include <sys/ioctl.h> | ||
| #include <stdlib.h> | ||
| #include <stdio.h> | ||
| #include <linux/soundcard.h> | ||
|
|
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| #include "AudioOutput.h" | ||
|
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| class AudioOutputNullSlow : public AudioOutput | ||
| { | ||
| public: | ||
| AudioOutputNullSlow() { }; | ||
| ~AudioOutputNullSlow() {}; | ||
| 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) { | ||
| fd = open("/dev/dsp", O_RDWR); | ||
| if (fd < 0) { | ||
| perror("open of /dev/dsp failed (Try with 'padsp this-exec')"); | ||
| exit(1); | ||
| } | ||
| } | ||
|
|
||
| if (channels && lastchannels != channels) { | ||
| Serial.printf("CHANNELS=%d\n", channels); | ||
| int arg = channels; /* mono or stereo */ | ||
| int status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg); | ||
| if (status == -1) { | ||
| perror("SOUND_PCM_WRITE_CHANNELS ioctl failed"); | ||
| exit(1); | ||
| } else if (arg != channels) { | ||
| perror("unable to set number of channels"); | ||
| exit(1); | ||
| } | ||
| lastchannels = channels; | ||
| } | ||
|
|
||
| if (lastchannels > 0 && hertz && lasthertz != hertz) { | ||
| Serial.printf("FREQ=%d\n", hertz); | ||
| int arg = hertz*4/lastchannels; /* sampling rate */ | ||
| int status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg); | ||
| if (status == -1) { | ||
| perror("SOUND_PCM_WRITE_RATE ioctl failed"); | ||
| exit(1); | ||
| } | ||
| lasthertz = hertz; | ||
| } | ||
|
|
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| if (bps && lastbps != bps) { | ||
| Serial.printf("BPS=%d\n", bps); | ||
| int arg = bps; /* sample size */ | ||
| int status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg); | ||
| if (status == -1) { | ||
| perror("SOUND_PCM_WRITE_BITS ioctl failed"); | ||
| exit(1); | ||
| } else if (arg != bps) { | ||
| perror("unable to set sample size"); | ||
| exit(1); | ||
| } | ||
| lastbps = bps; | ||
| } | ||
|
|
||
| if ((++samples & ((1<<9)-1)) == 0) { | ||
| // let the main loop a chance to run | ||
| return false; | ||
| } | ||
|
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| if (write(fd, sample, sizeof(sample)) != sizeof(sample)) { | ||
| perror("doing sound"); | ||
| exit(1); | ||
| } | ||
|
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| return true; | ||
| } | ||
|
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| virtual bool stop() { endms = millis(); return true; }; | ||
| unsigned long GetMilliseconds() { return endms - startms; } | ||
| int GetSamples() { return samples; } | ||
| int GetFrequency() { return hertz; } | ||
|
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| protected: | ||
| unsigned long startms; | ||
| unsigned long endms; | ||
| int samples; | ||
| int lastchannels = -1; | ||
| int lasthertz = -1; | ||
| int lastbps = -1; | ||
| int fd = -1; | ||
| }; | ||
|
|
||
| #endif |
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