gstreamer/subprojects/gst-plugins-good/sys/oss4/oss4-source.c

548 lines
16 KiB
C

/* GStreamer OSS4 audio source
* Copyright (C) 2007-2008 Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-oss4src
* @title: oss4src
*
* This element lets you record sound using the Open Sound System (OSS)
* version 4.
*
* ## Example pipelines
* |[
* gst-launch-1.0 -v oss4src ! queue ! audioconvert ! vorbisenc ! oggmux ! filesink location=mymusic.ogg
* ]| will record sound from your sound card using OSS4 and encode it to an
* Ogg/Vorbis file (this will only work if your mixer settings are right
* and the right inputs areenabled etc.)
*
*/
/* FIXME: make sure we're not doing ioctls from the app thread (e.g. via the
* mixer interface) while recording */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <gst/gst-i18n-plugin.h>
#define NO_LEGACY_MIXER
#include "oss4-audio.h"
#include "oss4-source.h"
#include "oss4-property-probe.h"
#include "oss4-soundcard.h"
#define GST_OSS4_SOURCE_IS_OPEN(src) (GST_OSS4_SOURCE(src)->fd != -1)
GST_DEBUG_CATEGORY_EXTERN (oss4src_debug);
#define GST_CAT_DEFAULT oss4src_debug
#define DEFAULT_DEVICE NULL
#define DEFAULT_DEVICE_NAME NULL
enum
{
PROP_0,
PROP_DEVICE,
PROP_DEVICE_NAME
};
#define gst_oss4_source_parent_class parent_class
G_DEFINE_TYPE (GstOss4Source, gst_oss4_source, GST_TYPE_AUDIO_SRC);
GST_ELEMENT_REGISTER_DEFINE (oss4src, "oss4src", GST_RANK_SECONDARY + 1,
GST_TYPE_OSS4_SOURCE);
static void gst_oss4_source_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_oss4_source_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_oss4_source_dispose (GObject * object);
static void gst_oss4_source_finalize (GstOss4Source * osssrc);
static GstCaps *gst_oss4_source_getcaps (GstBaseSrc * bsrc, GstCaps * filter);
static gboolean gst_oss4_source_open (GstAudioSrc * asrc,
gboolean silent_errors);
static gboolean gst_oss4_source_open_func (GstAudioSrc * asrc);
static gboolean gst_oss4_source_close (GstAudioSrc * asrc);
static gboolean gst_oss4_source_prepare (GstAudioSrc * asrc,
GstAudioRingBufferSpec * spec);
static gboolean gst_oss4_source_unprepare (GstAudioSrc * asrc);
static guint gst_oss4_source_read (GstAudioSrc * asrc, gpointer data,
guint length, GstClockTime * timestamp);
static guint gst_oss4_source_delay (GstAudioSrc * asrc);
static void gst_oss4_source_reset (GstAudioSrc * asrc);
static void
gst_oss4_source_class_init (GstOss4SourceClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSrcClass *gstbasesrc_class;
GstAudioSrcClass *gstaudiosrc_class;
GstPadTemplate *templ;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstbasesrc_class = (GstBaseSrcClass *) klass;
gstaudiosrc_class = (GstAudioSrcClass *) klass;
gobject_class->dispose = gst_oss4_source_dispose;
gobject_class->finalize = (GObjectFinalizeFunc) gst_oss4_source_finalize;
gobject_class->get_property = gst_oss4_source_get_property;
gobject_class->set_property = gst_oss4_source_set_property;
gstbasesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_oss4_source_getcaps);
gstaudiosrc_class->open = GST_DEBUG_FUNCPTR (gst_oss4_source_open_func);
gstaudiosrc_class->prepare = GST_DEBUG_FUNCPTR (gst_oss4_source_prepare);
gstaudiosrc_class->unprepare = GST_DEBUG_FUNCPTR (gst_oss4_source_unprepare);
gstaudiosrc_class->close = GST_DEBUG_FUNCPTR (gst_oss4_source_close);
gstaudiosrc_class->read = GST_DEBUG_FUNCPTR (gst_oss4_source_read);
gstaudiosrc_class->delay = GST_DEBUG_FUNCPTR (gst_oss4_source_delay);
gstaudiosrc_class->reset = GST_DEBUG_FUNCPTR (gst_oss4_source_reset);
g_object_class_install_property (gobject_class, PROP_DEVICE,
g_param_spec_string ("device", "Device",
"OSS4 device (e.g. /dev/oss/hdaudio0/pcm0 or /dev/dspN) "
"(NULL = use first available device)",
DEFAULT_DEVICE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DEVICE_NAME,
g_param_spec_string ("device-name", "Device name",
"Human-readable name of the sound device", DEFAULT_DEVICE_NAME,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class,
"OSS v4 Audio Source", "Source/Audio",
"Capture from a sound card via OSS version 4",
"Tim-Philipp Müller <tim centricular net>");
templ = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_oss4_audio_get_template_caps ());
gst_element_class_add_pad_template (gstelement_class, templ);
}
static void
gst_oss4_source_init (GstOss4Source * osssrc)
{
const gchar *device;
device = g_getenv ("AUDIODEV");
if (device == NULL)
device = DEFAULT_DEVICE;
osssrc->fd = -1;
osssrc->device = g_strdup (device);
osssrc->device_name = g_strdup (DEFAULT_DEVICE_NAME);
osssrc->device_name = NULL;
}
static void
gst_oss4_source_finalize (GstOss4Source * oss)
{
g_free (oss->device);
oss->device = NULL;
G_OBJECT_CLASS (parent_class)->finalize ((GObject *) (oss));
}
static void
gst_oss4_source_dispose (GObject * object)
{
GstOss4Source *oss = GST_OSS4_SOURCE (object);
if (oss->probed_caps) {
gst_caps_unref (oss->probed_caps);
oss->probed_caps = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_oss4_source_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstOss4Source *oss;
oss = GST_OSS4_SOURCE (object);
switch (prop_id) {
case PROP_DEVICE:
GST_OBJECT_LOCK (oss);
if (oss->fd == -1) {
g_free (oss->device);
oss->device = g_value_dup_string (value);
g_free (oss->device_name);
oss->device_name = NULL;
} else {
g_warning ("%s: can't change \"device\" property while audio source "
"is open", GST_OBJECT_NAME (oss));
}
GST_OBJECT_UNLOCK (oss);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_oss4_source_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstOss4Source *oss;
oss = GST_OSS4_SOURCE (object);
switch (prop_id) {
case PROP_DEVICE:
GST_OBJECT_LOCK (oss);
g_value_set_string (value, oss->device);
GST_OBJECT_UNLOCK (oss);
break;
case PROP_DEVICE_NAME:
GST_OBJECT_LOCK (oss);
/* If device is set, try to retrieve the name even if we're not open */
if (oss->fd == -1 && oss->device != NULL) {
if (gst_oss4_source_open (GST_AUDIO_SRC (oss), TRUE)) {
g_value_set_string (value, oss->device_name);
gst_oss4_source_close (GST_AUDIO_SRC (oss));
} else {
gchar *name = NULL;
gst_oss4_property_probe_find_device_name_nofd (GST_OBJECT (oss),
oss->device, &name);
g_value_set_string (value, name);
g_free (name);
}
} else {
g_value_set_string (value, oss->device_name);
}
GST_OBJECT_UNLOCK (oss);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
gst_oss4_source_getcaps (GstBaseSrc * bsrc, GstCaps * filter)
{
GstOss4Source *oss;
GstCaps *caps;
oss = GST_OSS4_SOURCE (bsrc);
if (oss->fd == -1) {
caps = gst_oss4_audio_get_template_caps ();
} else if (oss->probed_caps) {
caps = gst_caps_copy (oss->probed_caps);
} else {
caps = gst_oss4_audio_probe_caps (GST_OBJECT (oss), oss->fd);
if (caps != NULL && !gst_caps_is_empty (caps)) {
oss->probed_caps = gst_caps_copy (caps);
}
}
if (filter && caps) {
GstCaps *intersection;
intersection =
gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (caps);
return intersection;
} else {
return caps;
}
}
/* note: we must not take the object lock here unless we fix up get_property */
static gboolean
gst_oss4_source_open (GstAudioSrc * asrc, gboolean silent_errors)
{
GstOss4Source *oss;
gchar *device;
int mode;
oss = GST_OSS4_SOURCE (asrc);
if (oss->device)
device = g_strdup (oss->device);
else
device = gst_oss4_audio_find_device (GST_OBJECT_CAST (oss));
/* desperate times, desperate measures */
if (device == NULL)
device = g_strdup ("/dev/dsp0");
GST_INFO_OBJECT (oss, "Trying to open OSS4 device '%s'", device);
/* we open in non-blocking mode even if we don't really want to do writes
* non-blocking because we can't be sure that this is really a genuine
* OSS4 device with well-behaved drivers etc. We really don't want to
* hang forever under any circumstances. */
oss->fd = open (device, O_RDONLY | O_NONBLOCK, 0);
if (oss->fd == -1) {
switch (errno) {
case EBUSY:
goto busy;
case EACCES:
goto no_permission;
default:
goto open_failed;
}
}
GST_INFO_OBJECT (oss, "Opened device");
/* Make sure it's OSS4. If it's old OSS, let osssink handle it */
if (!gst_oss4_audio_check_version (GST_OBJECT_CAST (oss), oss->fd))
goto legacy_oss;
/* now remove the non-blocking flag. */
mode = fcntl (oss->fd, F_GETFL);
mode &= ~O_NONBLOCK;
if (fcntl (oss->fd, F_SETFL, mode) < 0) {
/* some drivers do no support unsetting the non-blocking flag, try to
* close/open the device then. This is racy but we error out properly. */
GST_WARNING_OBJECT (oss, "failed to unset O_NONBLOCK (buggy driver?), "
"will try to re-open device now");
gst_oss4_source_close (asrc);
if ((oss->fd = open (device, O_RDONLY, 0)) == -1)
goto non_block;
}
oss->open_device = device;
/* not using ENGINEINFO here because it sometimes returns a different and
* less useful name than AUDIOINFO for the same device */
if (!gst_oss4_property_probe_find_device_name (GST_OBJECT (oss), oss->fd,
oss->open_device, &oss->device_name)) {
oss->device_name = NULL;
}
return TRUE;
/* ERRORS */
busy:
{
if (!silent_errors) {
GST_ELEMENT_ERROR (oss, RESOURCE, BUSY,
(_("Could not open audio device for playback. "
"Device is being used by another application.")), (NULL));
}
g_free (device);
return FALSE;
}
no_permission:
{
if (!silent_errors) {
GST_ELEMENT_ERROR (oss, RESOURCE, OPEN_READ,
(_("Could not open audio device for playback. "
"You don't have permission to open the device.")),
GST_ERROR_SYSTEM);
}
g_free (device);
return FALSE;
}
open_failed:
{
if (!silent_errors) {
GST_ELEMENT_ERROR (oss, RESOURCE, OPEN_READ,
(_("Could not open audio device for playback.")), GST_ERROR_SYSTEM);
}
g_free (device);
return FALSE;
}
legacy_oss:
{
gst_oss4_source_close (asrc);
if (!silent_errors) {
GST_ELEMENT_ERROR (oss, RESOURCE, OPEN_READ,
(_("Could not open audio device for playback. "
"This version of the Open Sound System is not supported by this "
"element.")), ("Try the 'osssink' element instead"));
}
g_free (device);
return FALSE;
}
non_block:
{
if (!silent_errors) {
GST_ELEMENT_ERROR (oss, RESOURCE, SETTINGS, (NULL),
("Unable to set device %s into non-blocking mode: %s",
oss->device, g_strerror (errno)));
}
g_free (device);
return FALSE;
}
}
static gboolean
gst_oss4_source_open_func (GstAudioSrc * asrc)
{
return gst_oss4_source_open (asrc, FALSE);
}
static gboolean
gst_oss4_source_close (GstAudioSrc * asrc)
{
GstOss4Source *oss;
oss = GST_OSS4_SOURCE (asrc);
if (oss->fd != -1) {
GST_DEBUG_OBJECT (oss, "closing device");
close (oss->fd);
oss->fd = -1;
}
oss->bytes_per_sample = 0;
gst_caps_replace (&oss->probed_caps, NULL);
g_free (oss->open_device);
oss->open_device = NULL;
g_free (oss->device_name);
oss->device_name = NULL;
return TRUE;
}
static gboolean
gst_oss4_source_prepare (GstAudioSrc * asrc, GstAudioRingBufferSpec * spec)
{
GstOss4Source *oss;
oss = GST_OSS4_SOURCE (asrc);
if (!gst_oss4_audio_set_format (GST_OBJECT_CAST (oss), oss->fd, spec)) {
GST_WARNING_OBJECT (oss, "Couldn't set requested format %" GST_PTR_FORMAT,
spec->caps);
return FALSE;
}
oss->bytes_per_sample = GST_AUDIO_INFO_BPF (&spec->info);
return TRUE;
}
static gboolean
gst_oss4_source_unprepare (GstAudioSrc * asrc)
{
/* could do a SNDCTL_DSP_HALT, but the OSS manual recommends a close/open,
* since HALT won't properly reset some devices, apparently */
if (!gst_oss4_source_close (asrc))
goto couldnt_close;
if (!gst_oss4_source_open_func (asrc))
goto couldnt_reopen;
return TRUE;
/* ERRORS */
couldnt_close:
{
GST_DEBUG_OBJECT (asrc, "Couldn't close the audio device");
return FALSE;
}
couldnt_reopen:
{
GST_DEBUG_OBJECT (asrc, "Couldn't reopen the audio device");
return FALSE;
}
}
static guint
gst_oss4_source_read (GstAudioSrc * asrc, gpointer data, guint length,
GstClockTime * timestamp)
{
GstOss4Source *oss;
int n;
oss = GST_OSS4_SOURCE_CAST (asrc);
n = read (oss->fd, data, length);
GST_LOG_OBJECT (asrc, "%u bytes, %u samples", n, n / oss->bytes_per_sample);
if (G_UNLIKELY (n < 0)) {
switch (errno) {
case ENOTSUP:
case EACCES:{
/* This is the most likely cause, I think */
GST_ELEMENT_ERROR (asrc, RESOURCE, READ,
(_("Recording is not supported by this audio device.")),
("read: %s (device: %s) (maybe this is an output-only device?)",
g_strerror (errno), oss->open_device));
break;
}
default:{
GST_ELEMENT_ERROR (asrc, RESOURCE, READ,
(_("Error recording from audio device.")),
("read: %s (device: %s)", g_strerror (errno), oss->open_device));
break;
}
}
}
return (guint) n;
}
static guint
gst_oss4_source_delay (GstAudioSrc * asrc)
{
audio_buf_info info = { 0, };
GstOss4Source *oss;
guint delay;
oss = GST_OSS4_SOURCE_CAST (asrc);
if (ioctl (oss->fd, SNDCTL_DSP_GETISPACE, &info) == -1) {
GST_LOG_OBJECT (oss, "GETISPACE failed: %s", g_strerror (errno));
return 0;
}
delay = (info.fragstotal * info.fragsize) - info.bytes;
GST_LOG_OBJECT (oss, "fragstotal:%d, fragsize:%d, bytes:%d, delay:%d",
info.fragstotal, info.fragsize, info.bytes, delay);
return delay;
}
static void
gst_oss4_source_reset (GstAudioSrc * asrc)
{
/* There's nothing we can do here really: OSS can't handle access to the
* same device/fd from multiple threads and might deadlock or blow up in
* other ways if we try an ioctl SNDCTL_DSP_HALT or similar */
}