Blame libao/audio_out_oss.c

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/*
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 * audio_out_oss.c
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 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
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 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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 *
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 * This file is part of a52dec, a free ATSC A-52 stream decoder.
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 * See http://liba52.sourceforge.net/ for updates.
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 *
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 * a52dec is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * a52dec is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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#include "config.h"
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#ifdef LIBAO_OSS
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#if defined(__OpenBSD__)
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#include <soundcard.h>
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#elif defined(__FreeBSD__)
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#include <machine/soundcard.h>
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#ifndef AFMT_S16_NE
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#include <machine/endian.h>
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define AFMT_S16_NE AFMT_S16_LE
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#else
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#define AFMT_S16_NE AFMT_S16_BE
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#endif
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#endif
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#else
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#include <sys/soundcard.h>
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#endif
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#include "a52.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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typedef struct oss_instance_s {
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    ao_instance_t ao;
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    int fd;
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    int sample_rate;
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    int set_params;
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    int flags;
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} oss_instance_t;
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static int oss_setup (ao_instance_t * _instance, int sample_rate, int * flags,
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		      sample_t * level, sample_t * bias)
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{
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    oss_instance_t * instance = (oss_instance_t *) _instance;
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    if ((instance->set_params == 0) && (instance->sample_rate != sample_rate))
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	return 1;
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    instance->sample_rate = sample_rate;
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    *flags = instance->flags;
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    *level = 1;
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    *bias = 384;
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    return 0;
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}
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static int oss_play (ao_instance_t * _instance, int flags, sample_t * _samples)
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{
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    oss_instance_t * instance = (oss_instance_t *) _instance;
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    int16_t int16_samples[256*6];
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    int chans = -1;
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#ifdef LIBA52_DOUBLE
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    float samples[256 * 6];
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    int i;
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    for (i = 0; i < 256 * 6; i++)
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	samples[i] = _samples[i];
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#else
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    float * samples = _samples;
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#endif
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    chans = channels_multi (flags);
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    flags &= A52_CHANNEL_MASK | A52_LFE;
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    if (instance->set_params) {
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	int tmp;
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	tmp = chans;
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	if ((ioctl (instance->fd, SNDCTL_DSP_CHANNELS, &tmp) < 0) ||
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	    (tmp != chans)) {
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	    fprintf (stderr, "Can not set number of channels\n");
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	    return 1;
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	}
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	tmp = instance->sample_rate;
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	if ((ioctl (instance->fd, SNDCTL_DSP_SPEED, &tmp) < 0) ||
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	    (tmp != instance->sample_rate)) {
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	    fprintf (stderr, "Can not set sample rate\n");
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	    return 1;
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	}
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	instance->flags = flags;
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	instance->set_params = 0;
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    } else if ((flags == A52_DOLBY) && (instance->flags == A52_STEREO)) {
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	fprintf (stderr, "Switching from stereo to dolby surround\n");
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	instance->flags = A52_DOLBY;
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    } else if ((flags == A52_STEREO) && (instance->flags == A52_DOLBY)) {
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	fprintf (stderr, "Switching from dolby surround to stereo\n");
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	instance->flags = A52_STEREO;
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    } else if (flags != instance->flags)
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	return 1;
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    float2s16_multi (samples, int16_samples, flags);
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    write (instance->fd, int16_samples, 256 * sizeof (int16_t) * chans);
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    return 0;
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}
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static void oss_close (ao_instance_t * _instance)
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{
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    oss_instance_t * instance = (oss_instance_t *) _instance;
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    close (instance->fd);
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}
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static ao_instance_t * oss_open (int flags)
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{
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    oss_instance_t * instance;
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    int format;
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    instance = malloc (sizeof (oss_instance_t));
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    if (instance == NULL)
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	return NULL;
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    instance->ao.setup = oss_setup;
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    instance->ao.play = oss_play;
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    instance->ao.close = oss_close;
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    instance->sample_rate = 0;
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    instance->set_params = 1;
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    instance->flags = flags;
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    instance->fd = open ("/dev/dsp", O_WRONLY);
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    if (instance->fd < 0) {
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	fprintf (stderr, "Can not open /dev/dsp\n");
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	free (instance);
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	return NULL;
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    }
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    format = AFMT_S16_NE;
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    if ((ioctl (instance->fd, SNDCTL_DSP_SETFMT, &format) < 0) ||
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	(format != AFMT_S16_NE)) {
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	fprintf (stderr, "Can not set sample format\n");
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	free (instance);
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	return NULL;
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    }
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    return (ao_instance_t *) instance;
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}
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ao_instance_t * ao_oss_open (void)
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{
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    return oss_open (A52_STEREO);
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}
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ao_instance_t * ao_ossdolby_open (void)
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{
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    return oss_open (A52_DOLBY);
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}
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ao_instance_t * ao_oss4_open (void)
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{
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    return oss_open (A52_2F2R);
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}
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ao_instance_t * ao_oss6_open (void)
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{
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    return oss_open (A52_3F2R | A52_LFE);
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}
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#endif