467 lines
12 KiB
C
467 lines
12 KiB
C
/*
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* QEMU OSS audio output driver
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*
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* Copyright (c) 2003-2004 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* Temporary kludge */
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#if defined __linux__ || (defined _BSD && !defined __APPLE__)
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#include <assert.h>
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#include "vl.h"
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#define AUDIO_CAP "oss"
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#include "audio/audio.h"
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#include "audio/ossaudio.h"
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#define QC_OSS_FRAGSIZE "QEMU_OSS_FRAGSIZE"
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#define QC_OSS_NFRAGS "QEMU_OSS_NFRAGS"
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#define QC_OSS_MMAP "QEMU_OSS_MMAP"
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#define QC_OSS_DEV "QEMU_OSS_DEV"
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#define errstr() strerror (errno)
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static struct {
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int try_mmap;
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int nfrags;
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int fragsize;
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const char *dspname;
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} conf = {
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.try_mmap = 0,
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.nfrags = 4,
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.fragsize = 4096,
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.dspname = "/dev/dsp"
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};
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struct oss_params {
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int freq;
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audfmt_e fmt;
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int nchannels;
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int nfrags;
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int fragsize;
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};
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static int oss_hw_write (SWVoice *sw, void *buf, int len)
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{
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return pcm_hw_write (sw, buf, len);
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}
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static int AUD_to_ossfmt (audfmt_e fmt)
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{
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switch (fmt) {
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case AUD_FMT_S8: return AFMT_S8;
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case AUD_FMT_U8: return AFMT_U8;
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case AUD_FMT_S16: return AFMT_S16_LE;
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case AUD_FMT_U16: return AFMT_U16_LE;
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default:
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dolog ("Internal logic error: Bad audio format %d\nAborting\n", fmt);
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exit (EXIT_FAILURE);
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}
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}
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static int oss_to_audfmt (int fmt)
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{
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switch (fmt) {
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case AFMT_S8: return AUD_FMT_S8;
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case AFMT_U8: return AUD_FMT_U8;
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case AFMT_S16_LE: return AUD_FMT_S16;
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case AFMT_U16_LE: return AUD_FMT_U16;
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default:
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dolog ("Internal logic error: Unrecognized OSS audio format %d\n"
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"Aborting\n",
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fmt);
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exit (EXIT_FAILURE);
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}
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}
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#ifdef DEBUG_PCM
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static void oss_dump_pcm_info (struct oss_params *req, struct oss_params *obt)
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{
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dolog ("parameter | requested value | obtained value\n");
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dolog ("format | %10d | %10d\n", req->fmt, obt->fmt);
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dolog ("channels | %10d | %10d\n", req->nchannels, obt->nchannels);
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dolog ("frequency | %10d | %10d\n", req->freq, obt->freq);
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dolog ("nfrags | %10d | %10d\n", req->nfrags, obt->nfrags);
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dolog ("fragsize | %10d | %10d\n", req->fragsize, obt->fragsize);
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}
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#endif
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static int oss_open (struct oss_params *req, struct oss_params *obt, int *pfd)
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{
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int fd;
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int mmmmssss;
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audio_buf_info abinfo;
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int fmt, freq, nchannels;
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const char *dspname = conf.dspname;
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fd = open (dspname, O_RDWR | O_NONBLOCK);
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if (-1 == fd) {
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dolog ("Could not initialize audio hardware. Failed to open `%s':\n"
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"Reason:%s\n",
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dspname,
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errstr ());
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return -1;
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}
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freq = req->freq;
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nchannels = req->nchannels;
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fmt = req->fmt;
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if (ioctl (fd, SNDCTL_DSP_SAMPLESIZE, &fmt)) {
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dolog ("Could not initialize audio hardware\n"
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"Failed to set sample size\n"
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"Reason: %s\n",
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errstr ());
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goto err;
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}
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if (ioctl (fd, SNDCTL_DSP_CHANNELS, &nchannels)) {
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dolog ("Could not initialize audio hardware\n"
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"Failed to set number of channels\n"
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"Reason: %s\n",
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errstr ());
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goto err;
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}
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if (ioctl (fd, SNDCTL_DSP_SPEED, &freq)) {
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dolog ("Could not initialize audio hardware\n"
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"Failed to set frequency\n"
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"Reason: %s\n",
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errstr ());
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goto err;
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}
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if (ioctl (fd, SNDCTL_DSP_NONBLOCK)) {
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dolog ("Could not initialize audio hardware\n"
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"Failed to set non-blocking mode\n"
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"Reason: %s\n",
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errstr ());
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goto err;
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}
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mmmmssss = (req->nfrags << 16) | lsbindex (req->fragsize);
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if (ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &mmmmssss)) {
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dolog ("Could not initialize audio hardware\n"
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"Failed to set buffer length (%d, %d)\n"
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"Reason:%s\n",
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conf.nfrags, conf.fragsize,
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errstr ());
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goto err;
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}
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if (ioctl (fd, SNDCTL_DSP_GETOSPACE, &abinfo)) {
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dolog ("Could not initialize audio hardware\n"
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"Failed to get buffer length\n"
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"Reason:%s\n",
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errstr ());
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goto err;
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}
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obt->fmt = fmt;
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obt->nchannels = nchannels;
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obt->freq = freq;
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obt->nfrags = abinfo.fragstotal;
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obt->fragsize = abinfo.fragsize;
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*pfd = fd;
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if ((req->fmt != obt->fmt) ||
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(req->nchannels != obt->nchannels) ||
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(req->freq != obt->freq) ||
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(req->fragsize != obt->fragsize) ||
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(req->nfrags != obt->nfrags)) {
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#ifdef DEBUG_PCM
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dolog ("Audio parameters mismatch\n");
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oss_dump_pcm_info (req, obt);
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#endif
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}
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#ifdef DEBUG_PCM
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oss_dump_pcm_info (req, obt);
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#endif
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return 0;
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err:
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close (fd);
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return -1;
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}
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static void oss_hw_run (HWVoice *hw)
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{
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OSSVoice *oss = (OSSVoice *) hw;
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int err, rpos, live, decr;
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int samples;
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uint8_t *dst;
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st_sample_t *src;
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struct audio_buf_info abinfo;
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struct count_info cntinfo;
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live = pcm_hw_get_live (hw);
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if (live <= 0)
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return;
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if (oss->mmapped) {
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int bytes;
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err = ioctl (oss->fd, SNDCTL_DSP_GETOPTR, &cntinfo);
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if (err < 0) {
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dolog ("SNDCTL_DSP_GETOPTR failed\nReason: %s\n", errstr ());
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return;
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}
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if (cntinfo.ptr == oss->old_optr) {
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if (abs (hw->samples - live) < 64)
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dolog ("overrun\n");
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return;
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}
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if (cntinfo.ptr > oss->old_optr) {
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bytes = cntinfo.ptr - oss->old_optr;
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}
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else {
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bytes = hw->bufsize + cntinfo.ptr - oss->old_optr;
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}
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decr = audio_MIN (bytes >> hw->shift, live);
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}
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else {
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err = ioctl (oss->fd, SNDCTL_DSP_GETOSPACE, &abinfo);
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if (err < 0) {
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dolog ("SNDCTL_DSP_GETOSPACE failed\nReason: %s\n", errstr ());
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return;
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}
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decr = audio_MIN (abinfo.bytes >> hw->shift, live);
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if (decr <= 0)
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return;
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}
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samples = decr;
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rpos = hw->rpos;
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while (samples) {
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int left_till_end_samples = hw->samples - rpos;
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int convert_samples = audio_MIN (samples, left_till_end_samples);
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src = advance (hw->mix_buf, rpos * sizeof (st_sample_t));
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dst = advance (oss->pcm_buf, rpos << hw->shift);
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hw->clip (dst, src, convert_samples);
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if (!oss->mmapped) {
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int written;
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written = write (oss->fd, dst, convert_samples << hw->shift);
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/* XXX: follow errno recommendations ? */
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if (written == -1) {
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dolog ("Failed to write audio\nReason: %s\n", errstr ());
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continue;
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}
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if (written != convert_samples << hw->shift) {
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int wsamples = written >> hw->shift;
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int wbytes = wsamples << hw->shift;
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if (wbytes != written) {
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dolog ("Unaligned write %d, %d\n", wbytes, written);
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}
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memset (src, 0, wbytes);
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decr -= samples;
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rpos = (rpos + wsamples) % hw->samples;
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break;
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}
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}
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memset (src, 0, convert_samples * sizeof (st_sample_t));
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rpos = (rpos + convert_samples) % hw->samples;
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samples -= convert_samples;
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}
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if (oss->mmapped) {
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oss->old_optr = cntinfo.ptr;
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}
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pcm_hw_dec_live (hw, decr);
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hw->rpos = rpos;
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}
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static void oss_hw_fini (HWVoice *hw)
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{
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int err;
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OSSVoice *oss = (OSSVoice *) hw;
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ldebug ("oss_hw_fini\n");
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err = close (oss->fd);
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if (err) {
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dolog ("Failed to close OSS descriptor\nReason: %s\n", errstr ());
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}
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oss->fd = -1;
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if (oss->pcm_buf) {
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if (oss->mmapped) {
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err = munmap (oss->pcm_buf, hw->bufsize);
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if (err) {
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dolog ("Failed to unmap OSS buffer\nReason: %s\n",
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errstr ());
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}
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}
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else {
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qemu_free (oss->pcm_buf);
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}
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oss->pcm_buf = NULL;
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}
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}
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static int oss_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
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{
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OSSVoice *oss = (OSSVoice *) hw;
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struct oss_params req, obt;
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assert (!oss->fd);
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req.fmt = AUD_to_ossfmt (fmt);
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req.freq = freq;
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req.nchannels = nchannels;
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req.fragsize = conf.fragsize;
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req.nfrags = conf.nfrags;
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if (oss_open (&req, &obt, &oss->fd))
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return -1;
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hw->freq = obt.freq;
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hw->fmt = oss_to_audfmt (obt.fmt);
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hw->nchannels = obt.nchannels;
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oss->nfrags = obt.nfrags;
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oss->fragsize = obt.fragsize;
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hw->bufsize = obt.nfrags * obt.fragsize;
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oss->mmapped = 0;
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if (conf.try_mmap) {
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oss->pcm_buf = mmap (0, hw->bufsize, PROT_READ | PROT_WRITE,
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MAP_SHARED, oss->fd, 0);
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if (oss->pcm_buf == MAP_FAILED) {
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dolog ("Failed to mmap OSS device\nReason: %s\n",
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errstr ());
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}
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for (;;) {
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int err;
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int trig = 0;
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if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
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dolog ("SNDCTL_DSP_SETTRIGGER 0 failed\nReason: %s\n",
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errstr ());
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goto fail;
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}
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trig = PCM_ENABLE_OUTPUT;
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if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
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dolog ("SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
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"Reason: %s\n", errstr ());
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goto fail;
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}
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oss->mmapped = 1;
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break;
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fail:
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err = munmap (oss->pcm_buf, hw->bufsize);
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if (err) {
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dolog ("Failed to unmap OSS device\nReason: %s\n",
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errstr ());
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}
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}
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}
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if (!oss->mmapped) {
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oss->pcm_buf = qemu_mallocz (hw->bufsize);
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if (!oss->pcm_buf) {
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close (oss->fd);
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oss->fd = -1;
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return -1;
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}
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}
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return 0;
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}
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static int oss_hw_ctl (HWVoice *hw, int cmd, ...)
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{
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int trig;
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OSSVoice *oss = (OSSVoice *) hw;
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if (!oss->mmapped)
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return 0;
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switch (cmd) {
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case VOICE_ENABLE:
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ldebug ("enabling voice\n");
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pcm_hw_clear (hw, oss->pcm_buf, hw->samples);
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trig = PCM_ENABLE_OUTPUT;
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if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
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dolog ("SNDCTL_DSP_SETTRIGGER PCM_ENABLE_OUTPUT failed\n"
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"Reason: %s\n", errstr ());
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return -1;
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}
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break;
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case VOICE_DISABLE:
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ldebug ("disabling voice\n");
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trig = 0;
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if (ioctl (oss->fd, SNDCTL_DSP_SETTRIGGER, &trig) < 0) {
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dolog ("SNDCTL_DSP_SETTRIGGER 0 failed\nReason: %s\n",
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errstr ());
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return -1;
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}
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break;
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}
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return 0;
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}
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static void *oss_audio_init (void)
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{
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conf.fragsize = audio_get_conf_int (QC_OSS_FRAGSIZE, conf.fragsize);
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conf.nfrags = audio_get_conf_int (QC_OSS_NFRAGS, conf.nfrags);
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conf.try_mmap = audio_get_conf_int (QC_OSS_MMAP, conf.try_mmap);
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conf.dspname = audio_get_conf_str (QC_OSS_DEV, conf.dspname);
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return &conf;
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}
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static void oss_audio_fini (void *opaque)
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{
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}
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struct pcm_ops oss_pcm_ops = {
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oss_hw_init,
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oss_hw_fini,
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oss_hw_run,
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oss_hw_write,
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oss_hw_ctl
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};
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struct audio_output_driver oss_output_driver = {
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"oss",
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oss_audio_init,
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oss_audio_fini,
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&oss_pcm_ops,
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1,
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INT_MAX,
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sizeof (OSSVoice)
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};
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#endif
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