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sound examples: Delete stale ossinit.h file
Fixes: 3decd659a788("sound examples: Simplify audio example")
Sponsored by: The FreeBSD Foundation
MFC after: 2 days
This commit is contained in:
Christos Margiolis
parent
c3516c6533
commit
7ae4868a9a
@ -1,262 +0,0 @@
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/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2021 Goran Mekić
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/soundcard.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef SAMPLE_SIZE
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#define SAMPLE_SIZE 16
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#endif
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/* Format can be unsigned, in which case replace S with U */
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#if SAMPLE_SIZE == 32
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typedef int32_t sample_t;
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int format = AFMT_S32_NE; /* Signed 32bit native endian format */
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#elif SAMPLE_SIZE == 16
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typedef int16_t sample_t;
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int format = AFMT_S16_NE; /* Signed 16bit native endian format */
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#elif SAMPLE_SIZE == 8
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typedef int8_t sample_t;
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int format = AFMT_S8_NE; /* Signed 8bit native endian format */
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#else
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#error Unsupported sample format!
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typedef int32_t sample_t;
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int format = AFMT_S32_NE; /* Not a real value, just silencing
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* compiler errors */
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#endif
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/*
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* Minimal configuration for OSS
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* For real world applications, this structure will probably contain many
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* more fields
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*/
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typedef struct config {
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char *device;
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int channels;
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int fd;
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int format;
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int frag;
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int sample_count;
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int sample_rate;
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int sample_size;
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int chsamples;
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int mmap;
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oss_audioinfo audio_info;
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audio_buf_info buffer_info;
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} config_t;
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/*
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* Error state is indicated by value=-1 in which case application exits
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* with error
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*/
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static inline void
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check_error(const int value, const char *message)
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{
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if (value == -1) {
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fprintf(stderr, "OSS error: %s %s\n", message, strerror(errno));
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exit(1);
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}
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}
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/* Calculate frag by giving it minimal size of buffer */
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static inline int
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size2frag(int x)
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{
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int frag = 0;
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while ((1 << frag) < x) {
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++frag;
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}
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return frag;
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}
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/*
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* Split input buffer into channels. Input buffer is in interleaved format
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* which means if we have 2 channels (L and R), this is what the buffer of
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* 8 samples would contain: L,R,L,R,L,R,L,R. The result are two channels
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* containing: L,L,L,L and R,R,R,R.
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*/
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void
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oss_split(config_t *config, sample_t *input, sample_t *output)
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{
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int channel;
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int index;
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for (int i = 0; i < config->sample_count; ++i) {
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channel = i % config->channels;
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index = i / config->channels;
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output[channel * index] = input[i];
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}
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}
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/*
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* Convert channels into interleaved format and place it in output
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* buffer
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*/
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void
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oss_merge(config_t *config, sample_t *input, sample_t *output)
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{
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for (int channel = 0; channel < config->channels; ++channel) {
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for (int index = 0; index < config->chsamples; ++index) {
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output[index * config->channels + channel] = input[channel * index];
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}
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}
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}
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void
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oss_init(config_t *config)
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{
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int error;
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int tmp;
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/* Open the device for read and write */
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config->fd = open(config->device, O_RDWR);
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check_error(config->fd, "open");
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/* Get device information */
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config->audio_info.dev = -1;
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error = ioctl(config->fd, SNDCTL_ENGINEINFO, &(config->audio_info));
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check_error(error, "SNDCTL_ENGINEINFO");
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printf("min_channels: %d\n", config->audio_info.min_channels);
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printf("max_channels: %d\n", config->audio_info.max_channels);
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printf("latency: %d\n", config->audio_info.latency);
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printf("handle: %s\n", config->audio_info.handle);
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if (config->audio_info.min_rate > config->sample_rate || config->sample_rate > config->audio_info.max_rate) {
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fprintf(stderr, "%s doesn't support chosen ", config->device);
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fprintf(stderr, "samplerate of %dHz!\n", config->sample_rate);
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exit(1);
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}
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if (config->channels < 1) {
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config->channels = config->audio_info.max_channels;
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}
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/*
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* If device is going to be used in mmap mode, disable all format
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* conversions. Official OSS documentation states error code should not be
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* checked. http://manuals.opensound.com/developer/mmap_test.c.html#LOC10
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*/
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if (config->mmap) {
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tmp = 0;
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ioctl(config->fd, SNDCTL_DSP_COOKEDMODE, &tmp);
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}
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/*
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* Set number of channels. If number of channels is chosen to the value
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* near the one wanted, save it in config
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*/
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tmp = config->channels;
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error = ioctl(config->fd, SNDCTL_DSP_CHANNELS, &tmp);
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check_error(error, "SNDCTL_DSP_CHANNELS");
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if (tmp != config->channels) { /* or check if tmp is close enough? */
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fprintf(stderr, "%s doesn't support chosen ", config->device);
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fprintf(stderr, "channel count of %d", config->channels);
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fprintf(stderr, ", set to %d!\n", tmp);
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}
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config->channels = tmp;
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/* Set format, or bit size: 8, 16, 24 or 32 bit sample */
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tmp = config->format;
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error = ioctl(config->fd, SNDCTL_DSP_SETFMT, &tmp);
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check_error(error, "SNDCTL_DSP_SETFMT");
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if (tmp != config->format) {
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fprintf(stderr, "%s doesn't support chosen sample format!\n", config->device);
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exit(1);
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}
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/* Most common values for samplerate (in kHz): 44.1, 48, 88.2, 96 */
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tmp = config->sample_rate;
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error = ioctl(config->fd, SNDCTL_DSP_SPEED, &tmp);
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check_error(error, "SNDCTL_DSP_SPEED");
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/* Get and check device capabilities */
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error = ioctl(config->fd, SNDCTL_DSP_GETCAPS, &(config->audio_info.caps));
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check_error(error, "SNDCTL_DSP_GETCAPS");
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if (!(config->audio_info.caps & PCM_CAP_DUPLEX)) {
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fprintf(stderr, "Device doesn't support full duplex!\n");
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exit(1);
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}
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if (config->mmap) {
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if (!(config->audio_info.caps & PCM_CAP_TRIGGER)) {
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fprintf(stderr, "Device doesn't support triggering!\n");
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exit(1);
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}
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if (!(config->audio_info.caps & PCM_CAP_MMAP)) {
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fprintf(stderr, "Device doesn't support mmap mode!\n");
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exit(1);
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}
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}
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/*
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* If desired frag is smaller than minimum, based on number of channels
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* and format (size in bits: 8, 16, 24, 32), set that as frag. Buffer size
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* is 2^frag, but the real size of the buffer will be read when the
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* configuration of the device is successful
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*/
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int min_frag = size2frag(config->sample_size * config->channels);
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if (config->frag < min_frag) {
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config->frag = min_frag;
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}
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/*
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* Allocate buffer in fragments. Total buffer will be split in number
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* of fragments (2 by default)
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*/
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if (config->buffer_info.fragments < 0) {
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config->buffer_info.fragments = 2;
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}
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tmp = ((config->buffer_info.fragments) << 16) | config->frag;
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error = ioctl(config->fd, SNDCTL_DSP_SETFRAGMENT, &tmp);
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check_error(error, "SNDCTL_DSP_SETFRAGMENT");
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/* When all is set and ready to go, get the size of buffer */
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error = ioctl(config->fd, SNDCTL_DSP_GETOSPACE, &(config->buffer_info));
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check_error(error, "SNDCTL_DSP_GETOSPACE");
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if (config->buffer_info.bytes < 1) {
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fprintf(
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stderr,
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"OSS buffer error: buffer size can not be %d\n",
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config->buffer_info.bytes
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);
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exit(1);
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}
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config->sample_count = config->buffer_info.bytes / config->sample_size;
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config->chsamples = config->sample_count / config->channels;
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}
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