ref: 94408e30ff6589dd99d2237d1452e68e109b9e2d
dir: /src/oss.c/
/* * Copyright 1997 Chris Bagwell And Sundry Contributors * This source code is freely redistributable and may be used for * any purpose. This copyright notice must be maintained. * Chris Bagwell And Sundry Contributors are not * responsible for the consequences of using this software. * * Direct to Open Sound System (OSS) sound driver * OSS is a popular unix sound driver for Intel x86 unices (eg. Linux) * and several other unixes (such as SunOS/Solaris). * This driver is compatible with OSS original source that was called * USS, Voxware and TASD. * * added by Chris Bagwell (cbagwell@sprynet.com) on 2/19/96 * based on info grabed from vplay.c in Voxware snd-utils-3.5 package. * and on LINUX_PLAYER patches added by Greg Lee * which was originally from Directo to Sound Blaster device driver (sbdsp.c). * SBLAST patches by John T. Kohl. * * Changes: * * Nov. 26, 1999 Stan Brooks <stabro@megsinet.net> * Moved initialization code common to startread and startwrite * into a single function ossdspinit(). * */ #include "st_i.h" #if defined(HAVE_OSS) #include <unistd.h> #include <stdlib.h> #include <stdio.h> #include <fcntl.h> #ifdef HAVE_SYS_SOUNDCARD_H #include <sys/soundcard.h> #endif #ifdef HAVE_MACHINE_SOUNDCARD_H #include <machine/soundcard.h> #endif #include <sys/ioctl.h> /* common r/w initialization code */ static int ossdspinit(ft_t ft) { int sampletype, samplesize, dsp_stereo; int tmp, rc; if (ft->info.rate == 0.0) ft->info.rate = 8000; if (ft->info.size == -1) ft->info.size = ST_SIZE_BYTE; if (ft->info.size == ST_SIZE_BYTE) { sampletype = AFMT_U8; samplesize = 8; if (ft->info.encoding == -1) ft->info.encoding = ST_ENCODING_UNSIGNED; if (ft->info.encoding != ST_ENCODING_UNSIGNED) { st_report("OSS driver only supports unsigned with bytes"); st_report("Forcing to unsigned"); ft->info.encoding = ST_ENCODING_UNSIGNED; } } else if (ft->info.size == ST_SIZE_WORD) { sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_BE : AFMT_S16_LE; samplesize = 16; if (ft->info.encoding == -1) ft->info.encoding = ST_ENCODING_SIGN2; if (ft->info.encoding != ST_ENCODING_SIGN2) { st_report("OSS driver only supports signed with words"); st_report("Forcing to signed linear"); ft->info.encoding = ST_ENCODING_SIGN2; } } else { sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_BE : AFMT_S16_LE; samplesize = 16; ft->info.size = ST_SIZE_WORD; ft->info.encoding = ST_ENCODING_SIGN2; st_report("OSS driver only supports bytes and words"); st_report("Forcing to signed linear word"); } if (ft->info.channels == -1) ft->info.channels = 1; else if (ft->info.channels > 2) ft->info.channels = 2; if (ioctl(fileno(ft->fp), SNDCTL_DSP_RESET, 0) < 0) { st_fail_errno(ft,ST_EOF,"Unable to reset OSS driver. Possibly accessing an invalid file/device"); return(ST_EOF); } /* Query the supported formats and find the best match */ rc = ioctl(fileno(ft->fp), SNDCTL_DSP_GETFMTS, &tmp); if (rc == 0) { if ((tmp & sampletype) == 0) { /* is 16-bit supported? */ if (samplesize == 16 && (tmp & (AFMT_S16_LE|AFMT_S16_BE)) == 0) { /* Must not like 16-bits, try 8-bits */ ft->info.size = ST_SIZE_BYTE; ft->info.encoding = ST_ENCODING_UNSIGNED; st_report("OSS driver doesn't like signed words"); st_report("Forcing to unsigned bytes"); tmp = sampletype = AFMT_U8; samplesize = 8; } /* is 8-bit supported */ else if (samplesize == 8 && (tmp & AFMT_U8) == 0) { ft->info.size = ST_SIZE_WORD; ft->info.encoding = ST_ENCODING_SIGN2; st_report("OSS driver doesn't like unsigned bytes"); st_report("Forcing to signed words"); sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_BE : AFMT_S16_LE; samplesize = 16; } /* determine which 16-bit format to use */ if (samplesize == 16) { if ((tmp & sampletype) == 0) { sampletype = (ST_IS_BIGENDIAN) ? AFMT_S16_LE : AFMT_S16_BE; ft->swap = ft->swap ? 0 : 1; } } } tmp = sampletype; rc = ioctl(fileno(ft->fp), SNDCTL_DSP_SETFMT, &tmp); } /* Give up and exit */ if (rc < 0 || tmp != sampletype) { st_fail_errno(ft,ST_EOF,"Unable to set the sample size to %d", samplesize); return (ST_EOF); } if (ft->info.channels == 2) dsp_stereo = 1; else dsp_stereo = 0; tmp = dsp_stereo; if (ioctl(fileno(ft->fp), SNDCTL_DSP_STEREO, &tmp) < 0) { st_warn("Couldn't set to %s", dsp_stereo? "stereo":"mono"); dsp_stereo = 0; } if (tmp != dsp_stereo) { st_warn("Sound card appears to only support %d channels. Overriding format\n", tmp+1); ft->info.channels = tmp + 1; } tmp = ft->info.rate; if (ioctl (fileno(ft->fp), SNDCTL_DSP_SPEED, &tmp) < 0 || (int)ft->info.rate != tmp) { /* If the rate the sound card is using is not within 1% of what * the user specified then override the user setting. * The only reason not to always override this is because of * clock-rounding problems. Sound cards will sometimes use * things like 44101 when you ask for 44100. No need overriding * this and having strange output file rates for something that * we can't hear anyways. */ if ((int)ft->info.rate - tmp > (tmp * .01) || tmp - (int)ft->info.rate > (tmp * .01)) { st_warn("Unable to set audio speed to %d (set to %d)", ft->info.rate, tmp); ft->info.rate = tmp; } } /* Find out block size to use last because the driver could compute * its size based on specific rates/formats. */ ft->file.size = 0; ioctl (fileno(ft->fp), SNDCTL_DSP_GETBLKSIZE, &ft->file.size); if (ft->file.size < 4 || ft->file.size > 65536) { st_fail_errno(ft,ST_EOF,"Invalid audio buffer size %d", ft->file.size); return (ST_EOF); } ft->file.count = 0; ft->file.pos = 0; ft->file.eof = 0; if ((ft->file.buf = (char *)malloc(ft->file.size)) == NULL) { st_fail_errno(ft,ST_EOF,"Unable to allocate input/output buffer of size %d", ft->file.size); return (ST_EOF); } if (ioctl(fileno(ft->fp), SNDCTL_DSP_SYNC, NULL) < 0) { st_fail_errno(ft,ST_EOF,"Unable to sync dsp"); return (ST_EOF); } /* Change to non-buffered I/O */ setvbuf(ft->fp, NULL, _IONBF, sizeof(char) * ft->file.size); return(ST_SUCCESS); } /* * Do anything required before you start reading samples. * Read file header. * Find out sampling rate, * size and encoding of samples, * mono/stereo/quad. */ int st_ossdspstartread(ft_t ft) { int rc; rc = ossdspinit(ft); sigintreg(ft); /* Prepare to catch SIGINT */ return rc; } int st_ossdspstartwrite(ft_t ft) { return ossdspinit(ft); } #endif