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/*
* oss.c
*
* Copyright (C) Charles 'Buck' Krasic - January 2001
*
* This file is part of libdv, a free DV (IEC 61834/SMPTE 314M)
* codec.
*
* libdv is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser Public License as published by
* the Free Software Foundation; either version 2.1, or (at your
* option) any later version.
*
* libdv is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with libdv; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* The libdv homepage is http://libdv.sourceforge.net/.
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include "oss.h"
static const char *default_device = "/dev/dsp";
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
dv_oss_t *
dv_oss_new(void)
{
dv_oss_t *result;
result = (dv_oss_t *)calloc(1,sizeof(dv_oss_t));
if(!result) goto no_mem;
#if HAVE_LIBPOPT
result->option_table[DV_OSS_OPT_DEVICE] = (struct poptOption) {
longName: "audio-device",
argInfo: POPT_ARG_STRING,
arg: &result->arg_audio_device,
descrip: "target audio device; e.g. /dev/dsp [default]",
argDescrip: "devicename",
}; /* device */
result->option_table[DV_OSS_OPT_FILE] = (struct poptOption) {
longName: "audio-file",
argInfo: POPT_ARG_STRING,
arg: &result->arg_audio_file,
descrip: "send raw decoded audio to file, skipping audio ioctls",
argDescrip: "filename",
}; /* file */
#endif // HAVE_LIBPOPT
no_mem:
return(result);
} /* dv_oss_new */
/* Very simplistic for sound output using the OSS API */
int
dv_oss_init(dv_decoder_t *dv, dv_oss_t *oss)
{
int format = AFMT_S16_NE, rate_request, channels_request;
char *device;
channels_request = dv_get_num_channels (dv);
rate_request = dv_get_frequency (dv);
oss->buffer=NULL;
oss->fd=-1;
if(oss->arg_audio_device && oss->arg_audio_file) goto usage;
if(oss->arg_audio_file) {
if ((oss->fd = open(oss->arg_audio_file,
O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE,
S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP)) == -1) goto no_file;
} else {
device = (char *)(oss->arg_audio_device ? oss->arg_audio_device : default_device);
/* open audio device */
if ((oss->fd = open(device, O_RDWR, 0)) == -1) goto no_device;
/* set sample format -- try for 16bit */
if (ioctl(oss->fd, SNDCTL_DSP_SETFMT, &format) == -1) goto format_ioctl;
if (format != AFMT_S16_NE) goto format_unsupported;
/* set stereo mode */
if (ioctl(oss->fd, SNDCTL_DSP_CHANNELS, &channels_request) == -1) goto channels_ioctl;
if (channels_request != dv_get_num_channels (dv)) goto channels_unsupported;
/* set sampling rate */
if (ioctl(oss->fd, SNDCTL_DSP_SPEED, &rate_request) == -1) goto rate_ioctl;
if(rate_request != dv_get_frequency (dv)) goto rate_unsupported;
}
if(!(oss->buffer = malloc(DV_AUDIO_MAX_SAMPLES * channels_request * sizeof(short)))) goto no_memory;
return(TRUE);
usage:
fprintf(stderr,"can't send audio to both device and file\n");
exit(-1);
format_unsupported:
fprintf(stderr, "soundcard doesn't support format\n");
goto fail;
rate_unsupported:
fprintf(stderr,"audio rate found : %d Hz\n", rate_request);
fprintf(stderr, "soundcard doesn't support 48kHz (does %d)\n", rate_request);
goto fail;
channels_unsupported:
fprintf(stderr, "soundcard doesn't support %d channels\n", channels_request);
goto fail;
no_device:
perror(device);
goto fail;
no_file:
perror(oss->arg_audio_file);
goto fail;
format_ioctl:
perror("SNDCTL_DSP_SETFMT");
goto fail;
channels_ioctl:
perror("SNDCTL_DSP_CHANNELS");
goto fail;
rate_ioctl:
perror("SNDCTL_DSP_SPEED");
goto fail;
no_memory:
fprintf(stderr, "out of memory\n");
goto fail;
fail:
dv_oss_close(oss);
return(FALSE);
} /* dv_oss_init */
int
dv_oss_play(dv_decoder_t *dv, dv_oss_t *oss, short **out)
{
int ch, i, j=0, total, written=0, result, samples, channels;
/* Interleave the audio into a single buffer */
for (i = 0, samples = dv_get_num_samples (dv), channels = dv_get_num_channels (dv);
i < samples; i++) {
for (ch = 0; ch < channels; ch++) {
oss -> buffer [j++] = out [ch] [i];
} /* for */
} /* for */
/* Send the audio to the device */
total = samples * channels * sizeof (short);
do {
result = write(oss->fd, oss->buffer + written, total - written);
if(result <= 0) goto write_error;
written += result;
} while(total > written);
if(!oss->arg_audio_file) {
if (ioctl(oss->fd, SNDCTL_DSP_POST, NULL) == -1) goto post_ioctl;
} /* if */
return(TRUE);
write_error:
perror("write");
return(FALSE);
post_ioctl:
perror("SNDCTL_DSP_POST");
return(FALSE);
} /* dv_oss_play */
void
dv_oss_close(dv_oss_t *oss)
{
if(oss->fd != -1) {
close(oss->fd);
oss->fd = -1;
} /* if */
if(oss->buffer) {
oss->buffer = NULL;
free(oss->buffer);
} /* if */
} /* dv_oss_close */
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