149 lines
4.5 KiB
C
149 lines
4.5 KiB
C
/****************************************************************************
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* examples/i2sloop/i2sloop_main.c
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*
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* Copyright 2018 Sony Video & Sound Products Inc.
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* Author: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/audio/audio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.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 <assert.h>
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#include <signal.h>
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static bool g_i2sloop_running;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static void _signal_handler(int number)
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{
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g_i2sloop_running = false;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: i2sloop_main
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****************************************************************************/
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int main(int argc, FAR char *argv[])
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{
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FAR struct ap_buffer_s *apb;
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struct audio_buf_desc_s desc;
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ssize_t bufsize;
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int ret;
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int fd;
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int opt;
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int ch;
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int freq;
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ch = 1;
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freq = 16000;
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while ((opt = getopt(argc, argv, "c:f:")) != -1)
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{
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switch (opt)
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{
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case 'c':
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ch = atoi(optarg);
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break;
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case 'f':
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freq = atoi(optarg);
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break;
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}
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}
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/* Open the I2S character device */
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fd = open("/dev/i2schar0", O_RDWR);
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DEBUGASSERT(0 < fd);
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/* Setup sample freq for i2s */
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struct audio_caps_desc_s cap_desc;
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cap_desc.caps.ac_len = sizeof(struct audio_caps_s);
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cap_desc.caps.ac_type = AUDIO_TYPE_OUTPUT | AUDIO_TYPE_INPUT;
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cap_desc.caps.ac_controls.w = freq;
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cap_desc.caps.ac_channels = ch;
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cap_desc.caps.ac_format.hw = AUDIO_FMT_PCM;
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ioctl(fd, AUDIOIOC_CONFIGURE, (unsigned long)&cap_desc);
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/* Allocate an audio buffer */
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desc.numbytes = 1024;
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desc.u.pbuffer = &apb;
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ret = apb_alloc(&desc);
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DEBUGASSERT(ret == sizeof(desc));
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signal(1, _signal_handler);
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g_i2sloop_running = true;
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while (g_i2sloop_running)
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{
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bufsize = sizeof(struct ap_buffer_s) + apb->nmaxbytes;
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ret = read(fd, apb, bufsize);
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if (0 < ret)
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{
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apb->nbytes = apb->nmaxbytes;
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bufsize = sizeof(struct ap_buffer_s) + apb->nbytes;
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ret = write(fd, apb, bufsize);
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}
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}
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apb_free(apb);
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close(fd);
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return EXIT_SUCCESS;
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}
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