ref: c61a5fec6258b484fc7e5fbd2a088eff1c4571be
dir: /src/sunaudio.c/
#if defined(SUNAUDIO_PLAYER) /* * 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. * Rick Richardson, Lance Norskog And Sundry Contributors are not * responsible for the consequences of using this software. */ /* Direct to Sun Audio Driver * * Added by Chris Bagwell (cbagwell@sprynet.com) on 2/26/96 * Based on oss driver. * * Cleaned up changes of format somewhat in sunstartwrite on 03/31/98 * */ #include <sys/ioctl.h> #ifdef __SVR4 #include <sys/audioio.h> #else #include <sun/audioio.h> #endif #include <malloc.h> #include <unistd.h> #include <stdlib.h> #include <fcntl.h> #include "st.h" #include "libst.h" /* * Do anything required before you start reading samples. * Read file header. * Find out sampling rate, * size and style of samples, * mono/stereo/quad. */ void sunstartread(ft) ft_t ft; { int samplesize, encoding; audio_info_t audio_if; /* Hard code for now. */ ft->file.count = 0; ft->file.pos = 0; ft->file.eof = 0; ft->file.size = 1024; if ((ft->file.buf = malloc (ft->file.size)) == NULL) { fail("unable to allocate input buffer of size %d", ft->file.size); } if (ft->info.rate == 0.0) ft->info.rate = 8000; if (ft->info.size == -1) ft->info.size = BYTE; if (ft->info.style == -1) ft->info.style = ULAW; if (ft->info.size == BYTE) { samplesize = 8; if (ft->info.style != ULAW && ft->info.style != ALAW && ft->info.style != SIGN2) { fail("Sun Audio driver only supports ULAW, ALAW, and Signed Linear for bytes."); } } else if (ft->info.size == WORD) { samplesize = 16; if (ft->info.style != SIGN2) { fail("Sun Audio driver only supports Signed Linear for words."); } } else { fail("Sun Audio driver only supports bytes and words"); } if (ft->info.channels == -1) ft->info.channels = 1; else if (ft->info.channels > 1) { report("Warning: some sun audio devices can not play stereo"); report("at all or sometime only with signed words. If the"); report("sound seems sluggish then this is probably the case."); report("Try forcing output to signed words or use the avg"); report("filter to reduce the number of channels."); ft->info.channels = 2; } /* Read in old values, change to what we need and then send back */ if (ioctl(fileno(ft->fp), AUDIO_GETINFO, &audio_if) < 0) { fail("Unable to initialize /dev/audio"); } audio_if.record.precision = samplesize; audio_if.record.channels = ft->info.channels; audio_if.record.sample_rate = ft->info.rate; if (ft->info.style == ULAW) encoding = AUDIO_ENCODING_ULAW; else if (ft->info.style == ALAW) encoding = AUDIO_ENCODING_ALAW; else encoding = AUDIO_ENCODING_LINEAR; audio_if.record.encoding = encoding; ioctl(fileno(ft->fp), AUDIO_SETINFO, &audio_if); if (audio_if.record.precision != samplesize) { fail("Unable to initialize sample size for /dev/audio"); } if (audio_if.record.channels != ft->info.channels) { fail("Unable to initialize number of channels for /dev/audio"); } if (audio_if.record.sample_rate != ft->info.rate) { fail("Unable to initialize rate for /dev/audio"); } if (audio_if.record.encoding != encoding) { fail("Unable to initialize style for /dev/audio"); } sigintreg(ft); /* Prepare to catch SIGINT */ } void sunstartwrite(ft) ft_t ft; { int samplesize, encoding; audio_info_t audio_if; /* Hard code for now. */ ft->file.count = 0; ft->file.pos = 0; ft->file.eof = 0; ft->file.size = 1024; if ((ft->file.buf = malloc (ft->file.size)) == NULL) { fail("unable to allocate output buffer of size %d", ft->file.size); } if (ft->info.rate == 0.0) ft->info.rate = 8000; if (ft->info.size == -1) ft->info.size = BYTE; if (ft->info.style == -1) ft->info.style = ULAW; if (ft->info.size == BYTE) { samplesize = 8; if (ft->info.style != ULAW && ft->info.style != ALAW && ft->info.style != SIGN2) { report("Sun Audio driver only supports ULAW, ALAW, and Signed Linear for bytes."); report("Forcing to ULAW"); ft->info.style = ULAW; } } else if (ft->info.size == WORD) { samplesize = 16; if (ft->info.style != SIGN2) { report("Sun Audio driver only supports Signed Linear for words."); report("Forcing to Signed Linear"); ft->info.style = SIGN2; } } else { report("Sun Audio driver only supports bytes and words"); ft->info.size = WORD; samplesize = 16; } if (ft->info.channels == -1) ft->info.channels = 1; else if (ft->info.channels > 1) ft->info.channels = 2; /* Read in old values, change to what we need and then send back */ if (ioctl(fileno(ft->fp), AUDIO_GETINFO, &audio_if) < 0) { fail("Unable to initialize /dev/audio"); } audio_if.play.precision = samplesize; audio_if.play.channels = ft->info.channels; audio_if.play.sample_rate = ft->info.rate; if (ft->info.style == ULAW) encoding = AUDIO_ENCODING_ULAW; else if (ft->info.style == ALAW) encoding = AUDIO_ENCODING_ALAW; else encoding = AUDIO_ENCODING_LINEAR; audio_if.play.encoding = encoding; ioctl(fileno(ft->fp), AUDIO_SETINFO, &audio_if); if (audio_if.play.precision != samplesize) { fail("Unable to initialize sample size for /dev/audio"); } if (audio_if.play.channels != ft->info.channels) { fail("Unable to initialize number of channels for /dev/audio"); } if (audio_if.play.sample_rate != ft->info.rate) { fail("Unable to initialize rate for /dev/audio"); } if (audio_if.play.encoding != encoding) { fail("Unable to initialize style for /dev/audio"); } sigintreg(ft); } #endif