mirrors/pulseaudio
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git synced 2025-11-02 09:01:46 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions
pulseaudio/src/modules/oss/oss-util.c
Arun Raghavan 49101fc540 volume: Clamp volume to PA_VOLUME_MAX 
This ensures that we always clamp the volume to PA_VOLUME_MAX. While
this currently has no effect, it will be required for making sure we
don't exceed PA_VOLUME_MAX when its value changes in the future.
2010-10-15 01:10:00 +05:30

430 lines
11 KiB
C
Raw Blame History

/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio 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
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/soundcard.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pulse/xmalloc.h>
#include <pulsecore/core-error.h>
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include "oss-util.h"
int pa_oss_open(const char *device, int *mode, int* pcaps) {
int fd = -1;
int caps;
char *t;
pa_assert(device);
pa_assert(mode);
pa_assert(*mode == O_RDWR || *mode == O_RDONLY || *mode == O_WRONLY);
if(!pcaps)
pcaps = &caps;
if (*mode == O_RDWR) {
if ((fd = pa_open_cloexec(device, O_RDWR|O_NDELAY, 0)) >= 0) {
ioctl(fd, SNDCTL_DSP_SETDUPLEX, 0);
if (ioctl(fd, SNDCTL_DSP_GETCAPS, pcaps) < 0) {
pa_log("SNDCTL_DSP_GETCAPS: %s", pa_cstrerror(errno));
goto fail;
}
if (*pcaps & DSP_CAP_DUPLEX)
goto success;
pa_log_warn("'%s' doesn't support full duplex", device);
pa_close(fd);
}
if ((fd = pa_open_cloexec(device, (*mode = O_WRONLY)|O_NDELAY, 0)) < 0) {
if ((fd = pa_open_cloexec(device, (*mode = O_RDONLY)|O_NDELAY, 0)) < 0) {
pa_log("open('%s'): %s", device, pa_cstrerror(errno));
goto fail;
}
}
} else {
if ((fd = pa_open_cloexec(device, *mode|O_NDELAY, 0)) < 0) {
pa_log("open('%s'): %s", device, pa_cstrerror(errno));
goto fail;
}
}
*pcaps = 0;
if (ioctl(fd, SNDCTL_DSP_GETCAPS, pcaps) < 0) {
pa_log("SNDCTL_DSP_GETCAPS: %s", pa_cstrerror(errno));
goto fail;
}
success:
t = pa_sprintf_malloc(
"%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
*pcaps & DSP_CAP_BATCH ? " BATCH" : "",
#ifdef DSP_CAP_BIND
*pcaps & DSP_CAP_BIND ? " BIND" : "",
#else
"",
#endif
*pcaps & DSP_CAP_COPROC ? " COPROC" : "",
*pcaps & DSP_CAP_DUPLEX ? " DUPLEX" : "",
#ifdef DSP_CAP_FREERATE
*pcaps & DSP_CAP_FREERATE ? " FREERATE" : "",
#else
"",
#endif
#ifdef DSP_CAP_INPUT
*pcaps & DSP_CAP_INPUT ? " INPUT" : "",
#else
"",
#endif
*pcaps & DSP_CAP_MMAP ? " MMAP" : "",
#ifdef DSP_CAP_MODEM
*pcaps & DSP_CAP_MODEM ? " MODEM" : "",
#else
"",
#endif
#ifdef DSP_CAP_MULTI
*pcaps & DSP_CAP_MULTI ? " MULTI" : "",
#else
"",
#endif
#ifdef DSP_CAP_OUTPUT
*pcaps & DSP_CAP_OUTPUT ? " OUTPUT" : "",
#else
"",
#endif
*pcaps & DSP_CAP_REALTIME ? " REALTIME" : "",
#ifdef DSP_CAP_SHADOW
*pcaps & DSP_CAP_SHADOW ? " SHADOW" : "",
#else
"",
#endif
#ifdef DSP_CAP_VIRTUAL
*pcaps & DSP_CAP_VIRTUAL ? " VIRTUAL" : "",
#else
"",
#endif
*pcaps & DSP_CAP_TRIGGER ? " TRIGGER" : "");
pa_log_debug("capabilities:%s", t);
pa_xfree(t);
return fd;
fail:
if (fd >= 0)
pa_close(fd);
return -1;
}
int pa_oss_auto_format(int fd, pa_sample_spec *ss) {
int format, channels, speed, reqformat;
pa_sample_format_t orig_format;
static const int format_trans[PA_SAMPLE_MAX] = {
[PA_SAMPLE_U8] = AFMT_U8,
[PA_SAMPLE_ALAW] = AFMT_A_LAW,
[PA_SAMPLE_ULAW] = AFMT_MU_LAW,
[PA_SAMPLE_S16LE] = AFMT_S16_LE,
[PA_SAMPLE_S16BE] = AFMT_S16_BE,
[PA_SAMPLE_FLOAT32LE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_FLOAT32BE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_S32LE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_S32BE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_S24LE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_S24BE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_S24_32LE] = AFMT_QUERY, /* not supported */
[PA_SAMPLE_S24_32BE] = AFMT_QUERY, /* not supported */
};
pa_assert(fd >= 0);
pa_assert(ss);
orig_format = ss->format;
reqformat = format = format_trans[ss->format];
if (reqformat == AFMT_QUERY || ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != reqformat) {
format = AFMT_S16_NE;
if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_S16_NE) {
int f = AFMT_S16_NE == AFMT_S16_LE ? AFMT_S16_BE : AFMT_S16_LE;
format = f;
if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != f) {
format = AFMT_U8;
if (ioctl(fd, SNDCTL_DSP_SETFMT, &format) < 0 || format != AFMT_U8) {
pa_log("SNDCTL_DSP_SETFMT: %s", format != AFMT_U8 ? "No supported sample format" : pa_cstrerror(errno));
return -1;
} else
ss->format = PA_SAMPLE_U8;
} else
ss->format = f == AFMT_S16_LE ? PA_SAMPLE_S16LE : PA_SAMPLE_S16BE;
} else
ss->format = PA_SAMPLE_S16NE;
}
if (orig_format != ss->format)
pa_log_warn("device doesn't support sample format %s, changed to %s.",
pa_sample_format_to_string(orig_format),
pa_sample_format_to_string(ss->format));
channels = ss->channels;
if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0) {
pa_log("SNDCTL_DSP_CHANNELS: %s", pa_cstrerror(errno));
return -1;
}
pa_assert(channels > 0);
if (ss->channels != channels) {
pa_log_warn("device doesn't support %i channels, using %i channels.", ss->channels, channels);
ss->channels = (uint8_t) channels;
}
speed = (int) ss->rate;
if (ioctl(fd, SNDCTL_DSP_SPEED, &speed) < 0) {
pa_log("SNDCTL_DSP_SPEED: %s", pa_cstrerror(errno));
return -1;
}
pa_assert(speed > 0);
if (ss->rate != (unsigned) speed) {
pa_log_warn("device doesn't support %i Hz, changed to %i Hz.", ss->rate, speed);
/* If the sample rate deviates too much, we need to resample */
if (speed < ss->rate*.95 || speed > ss->rate*1.05)
ss->rate = (uint32_t) speed;
}
return 0;
}
static int simple_log2(int v) {
int k = 0;
for (;;) {
v >>= 1;
if (!v) break;
k++;
}
return k;
}
int pa_oss_set_fragments(int fd, int nfrags, int frag_size) {
int arg;
arg = ((int) nfrags << 16) | simple_log2(frag_size);
pa_log_debug("Asking for %i fragments of size %i (requested %i)", nfrags, 1 << simple_log2(frag_size), frag_size);
if (ioctl(fd, SNDCTL_DSP_SETFRAGMENT, &arg) < 0) {
pa_log("SNDCTL_DSP_SETFRAGMENT: %s", pa_cstrerror(errno));
return -1;
}
return 0;
}
int pa_oss_get_volume(int fd, unsigned long mixer, const pa_sample_spec *ss, pa_cvolume *volume) {
char cv[PA_CVOLUME_SNPRINT_MAX];
unsigned vol;
pa_assert(fd >= 0);
pa_assert(ss);
pa_assert(volume);
if (ioctl(fd, mixer, &vol) < 0)
return -1;
pa_cvolume_reset(volume, ss->channels);
volume->values[0] = PA_CLAMP_VOLUME(((vol & 0xFF) * PA_VOLUME_NORM) / 100);
if (volume->channels >= 2)
volume->values[1] = PA_CLAMP_VOLUME((((vol >> 8) & 0xFF) * PA_VOLUME_NORM) / 100);
pa_log_debug("Read mixer settings: %s", pa_cvolume_snprint(cv, sizeof(cv), volume));
return 0;
}
int pa_oss_set_volume(int fd, unsigned long mixer, const pa_sample_spec *ss, const pa_cvolume *volume) {
char cv[PA_CVOLUME_SNPRINT_MAX];
unsigned vol;
pa_volume_t l, r;
l = volume->values[0] > PA_VOLUME_NORM ? PA_VOLUME_NORM : volume->values[0];
vol = (l*100)/PA_VOLUME_NORM;
if (ss->channels >= 2) {
r = volume->values[1] > PA_VOLUME_NORM ? PA_VOLUME_NORM : volume->values[1];
vol |= ((r*100)/PA_VOLUME_NORM) << 8;
}
if (ioctl(fd, mixer, &vol) < 0)
return -1;
pa_log_debug("Wrote mixer settings: %s", pa_cvolume_snprint(cv, sizeof(cv), volume));
return 0;
}
static int get_device_number(const char *dev) {
const char *p, *e;
char *rp = NULL;
int r;
if (!(p = rp = pa_readlink(dev))) {
#ifdef ENOLINK
if (errno != EINVAL && errno != ENOLINK) {
#else
if (errno != EINVAL) {
#endif
r = -1;
goto finish;
}
p = dev;
}
if ((e = strrchr(p, '/')))
p = e+1;
if (p == 0) {
r = 0;
goto finish;
}
p = strchr(p, 0) -1;
if (*p >= '0' && *p <= '9') {
r = *p - '0';
goto finish;
}
r = -1;
finish:
pa_xfree(rp);
return r;
}
int pa_oss_get_hw_description(const char *dev, char *name, size_t l) {
FILE *f;
int n, r = -1;
int b = 0;
if ((n = get_device_number(dev)) < 0)
return -1;
if (!(f = pa_fopen_cloexec("/dev/sndstat", "r")) &&
!(f = pa_fopen_cloexec("/proc/sndstat", "r")) &&
!(f = pa_fopen_cloexec("/proc/asound/oss/sndstat", "r"))) {
if (errno != ENOENT)
pa_log_warn("failed to open OSS sndstat device: %s", pa_cstrerror(errno));
return -1;
}
while (!feof(f)) {
char line[64];
int device;
if (!fgets(line, sizeof(line), f))
break;
line[strcspn(line, "\r\n")] = 0;
if (!b) {
b = strcmp(line, "Audio devices:") == 0;
continue;
}
if (line[0] == 0)
break;
if (sscanf(line, "%i: ", &device) != 1)
continue;
if (device == n) {
char *k = strchr(line, ':');
pa_assert(k);
k++;
k += strspn(k, " ");
if (pa_endswith(k, " (DUPLEX)"))
k[strlen(k)-9] = 0;
pa_strlcpy(name, k, l);
r = 0;
break;
}
}
fclose(f);
return r;
}
static int open_mixer(const char *mixer) {
int fd;
if ((fd = pa_open_cloexec(mixer, O_RDWR|O_NDELAY, 0)) >= 0)
return fd;
return -1;
}
int pa_oss_open_mixer_for_device(const char *device) {
int n;
char *fn;
int fd;
if ((n = get_device_number(device)) < 0)
return -1;
if (n == 0)
if ((fd = open_mixer("/dev/mixer")) >= 0)
return fd;
fn = pa_sprintf_malloc("/dev/mixer%i", n);
fd = open_mixer(fn);
pa_xfree(fn);
if (fd < 0)
pa_log_warn("Failed to open mixer '%s': %s", device, pa_cstrerror(errno));
return fd;
}
Reference in a new issue View git blame Copy permalink