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/*
* Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file oss_write.c Paraslash's oss output plugin. */
#include <sys/ioctl.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/soundcard.h>
#include "para.h"
#include "fd.h"
#include "string.h"
#include "list.h"
#include "sched.h"
#include "ggo.h"
#include "write.h"
#include "oss_write.cmdline.h"
#include "error.h"
/** Always use 16 bit little endian. */
#define FORMAT AFMT_S16_LE
/** Data specific to the oss writer. */
struct private_oss_write_data {
/** The file handle of the device. */
int fd;
/**
* The samplerate given by command line option or the decoder
* of the writer node group.
*/
int samplerate;
/**
* The number of channels, given by command line option or the
* decoder of the writer node group.
*/
int channels;
/** Four bytes for stereo streams, two bytes for mono streams. */
int bytes_per_frame;
};
static int oss_pre_select(struct sched *s, struct writer_node *wn)
{
struct private_oss_write_data *powd = wn->private_data;
struct writer_node_group *wng = wn->wng;
if (*wng->loaded - wn->written < powd->bytes_per_frame)
return 0;
para_fd_set(powd->fd, &s->wfds, &s->max_fileno);
return 1;
}
static int oss_post_select(struct sched *s, struct writer_node *wn)
{
int ret;
struct private_oss_write_data *powd = wn->private_data;
struct writer_node_group *wng = wn->wng;
size_t frames, bytes = *wng->loaded - wn->written;
char *data = *wng->bufp + wn->written;
if (*wng->input_error < 0 && bytes < powd->bytes_per_frame) {
wn->written = *wng->loaded;
return *wng->input_error;
}
frames = bytes / powd->bytes_per_frame;
if (!frames) /* less than a single frame available */
goto out;
if (!FD_ISSET(powd->fd, &s->wfds))
goto out;
ret = write_nonblock(powd->fd, data, frames * powd->bytes_per_frame, 0);
if (ret < 0)
return ret;
wn->written += ret;
out:
return 1;
}
static void oss_close(struct writer_node *wn)
{
struct private_oss_write_data *powd = wn->private_data;
if (powd->fd >= 0)
close(powd->fd);
free(powd);
}
/*
* The Open Sound System Programmer's Guide sayeth:
*
* Set sampling parameters always so that number of channels (mono/stereo) is
* set before selecting sampling rate (speed). Failing to do this will make
* your program incompatible with cards such as the SoundBlaster Pro which
* supports 44.1 kHz in mono but just 22.05 kHz in stereo. A program which
* selects 44.1 kHz speed and then sets the device to stereo mode will
* incorrectly believe that the device is still in 44.1 kHz mode when actually
* the speed is decreased to 22.05 kHz.
*/
static int oss_open(struct writer_node *wn)
{
int ret, format = FORMAT, channels, samplerate;
struct oss_write_args_info *conf = wn->conf;
struct writer_node_group *wng = wn->wng;
struct private_oss_write_data *powd;
PARA_INFO_LOG("opening %s\n", conf->device_arg);
ret = para_open(conf->device_arg, O_WRONLY, 0);
if (ret < 0)
return ret;
powd = para_calloc(sizeof(*powd));
wn->private_data = powd;
powd->fd = ret;
ret = mark_fd_nonblocking(powd->fd);
if (ret < 0)
goto err;
/* set PCM format */
ret = ioctl(powd->fd, SNDCTL_DSP_SETFMT, &format);
if (ret < 0) {
ret = -ERRNO_TO_PARA_ERROR(errno);
goto err;
}
ret = -E_BAD_SAMPLE_FORMAT;
if (format != FORMAT)
goto err;
/* set number of channels */
if (!conf->channels_given && wng->channels)
channels = *wng->channels;
else
channels = conf->channels_arg;
ret = -E_BAD_CHANNEL_COUNT;
if (channels == 0)
goto err;
powd->channels = channels;
ret = ioctl(powd->fd, SNDCTL_DSP_CHANNELS, &channels);
if (ret < 0) {
ret = -ERRNO_TO_PARA_ERROR(errno);
goto err;
}
if (powd->channels != channels)
goto err;
powd->bytes_per_frame = channels * 2;
/*
* Set sampling rate
*
* If we request a higher sampling rate than is supported by the
* device, the the highest possible speed is automatically used. The
* value actually used is returned as the new value of the argument.
*/
if (!conf->samplerate_given && wng->samplerate)
samplerate = *wng->samplerate;
else
samplerate = conf->samplerate_arg;
powd->samplerate = samplerate;
ret = ioctl(powd->fd, SNDCTL_DSP_SPEED, &samplerate);
if (ret < 0) {
ret = -ERRNO_TO_PARA_ERROR(errno);
goto err;
}
if (samplerate != powd->samplerate) {
int min = PARA_MIN(samplerate, powd->samplerate),
max = PARA_MAX(samplerate, powd->samplerate);
/*
* Check whether the returned sample rate differs significantly
* from the requested one.
*/
ret = -E_BAD_SAMPLERATE;
if (100 * max > 110 * min) /* more than 10% deviation */
goto err;
PARA_NOTICE_LOG("using %dHz rather than %dHz\n", samplerate,
powd->samplerate);
}
return 1;
err:
close(powd->fd);
powd->fd = -1;
return ret;
}
__malloc static void *oss_parse_config(const char *options)
{
int ret;
struct oss_write_args_info *conf = para_calloc(sizeof(*conf));
PARA_INFO_LOG("options: %s, %zd\n", options, strcspn(options, " \t"));
ret = oss_cmdline_parser_string(options, conf, "oss_write");
if (ret)
goto err_out;
return conf;
err_out:
free(conf);
return NULL;
}
/**
* The init function of the oss writer.
*
* \param w Pointer to the writer to initialize.
*
* \sa struct writer.
*/
void oss_write_init(struct writer *w)
{
struct oss_write_args_info dummy;
oss_cmdline_parser_init(&dummy);
w->open = oss_open;
w->close = oss_close;
w->pre_select = oss_pre_select;
w->post_select = oss_post_select;
w->parse_config = oss_parse_config;
w->shutdown = NULL;
w->help = (struct ggo_help) {
.short_help = oss_write_args_info_help,
.detailed_help = oss_write_args_info_detailed_help
};
oss_cmdline_parser_free(&dummy);
}
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