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gstreamer/ext/alsa/gstalsa.c
Leif Johnson ba2b9bd9d1 + got the alsa mixer implementation to work ! 
Original commit message from CVS:
+ got the alsa mixer implementation to work !
2003-12-06 00:02:20 +00:00

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/*
* Copyright (C) 2001 CodeFactory AB
* Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
* Copyright (C) 2001-2002 Andy Wingo <apwingo@eos.ncsu.edu>
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/time.h>
#include "gstalsa.h"
#include "gstalsaclock.h"
#include "gstalsamixer.h"
/* GObject functions */
static void gst_alsa_class_init (gpointer g_class,
gpointer class_data);
static void gst_alsa_init (GstAlsa * this);
static void gst_alsa_dispose (GObject * object);
static void gst_alsa_set_property (GObject * object,
guint prop_id,
const GValue * value,
GParamSpec * pspec);
static void gst_alsa_get_property (GObject * object,
guint prop_id,
GValue * value,
GParamSpec * pspec);
/* GStreamer functions for pads and state changing */
static GstPad * gst_alsa_request_new_pad (GstElement * element,
GstPadTemplate * templ,
const gchar * name);
static GstElementStateReturn gst_alsa_change_state (GstElement * element);
static GstClock * gst_alsa_get_clock (GstElement * element);
static void gst_alsa_set_clock (GstElement * element,
GstClock * clock);
/* ALSA setup / start / stop functions */
static gboolean gst_alsa_probe_hw_params (GstAlsa * this,
GstAlsaFormat * format);
static gboolean gst_alsa_set_hw_params (GstAlsa * this);
static gboolean gst_alsa_set_sw_params (GstAlsa * this);
static gboolean gst_alsa_open_audio (GstAlsa * this);
static gboolean gst_alsa_start_audio (GstAlsa * this);
static gboolean gst_alsa_drain_audio (GstAlsa * this);
static gboolean gst_alsa_stop_audio (GstAlsa * this);
static gboolean gst_alsa_close_audio (GstAlsa * this);
/* GStreamer querying, conversion, and format functions */
static const GstFormat * gst_alsa_get_formats (GstPad * pad);
static gboolean gst_alsa_convert (GstAlsa * this,
GstFormat src_format,
gint64 src_value,
GstFormat * dest_format,
gint64 * dest_value);
static gboolean gst_alsa_pad_convert (GstPad * pad,
GstFormat src_format,
gint64 src_value,
GstFormat * dest_format,
gint64 * dest_value);
static const GstQueryType * gst_alsa_get_query_types (GstPad * pad);
static gboolean gst_alsa_query_func (GstElement * element,
GstQueryType type,
GstFormat * format,
gint64 * value);
static gboolean gst_alsa_query (GstElement * element,
GstQueryType type,
GstFormat * format,
gint64 * value);
static gboolean gst_alsa_pad_query (GstPad * pad,
GstQueryType type,
GstFormat * format,
gint64 * value);
/*** TYPE FUNCTIONS ***********************************************************/
GType
gst_alsa_get_type (void)
{
static GType alsa_type = 0;
if (!alsa_type) {
static const GTypeInfo alsa_info = {
sizeof (GstAlsaClass),
NULL,
NULL,
gst_alsa_class_init,
NULL,
NULL,
sizeof (GstAlsa),
0,
(GInstanceInitFunc) gst_alsa_init,
};
alsa_type = g_type_register_static (GST_TYPE_ELEMENT, "GstAlsa", &alsa_info, 0);
}
return alsa_type;
}
/*** GOBJECT FUNCTIONS ********************************************************/
enum
{
ARG_0,
ARG_DEVICE,
ARG_PERIODCOUNT,
ARG_PERIODSIZE,
ARG_BUFFERSIZE,
ARG_AUTORECOVER,
ARG_MMAP,
ARG_MAXDISCONT
};
static GstElement *parent_class = NULL;
static void
gst_alsa_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *object_class;
GstElementClass *element_class;
GstAlsaClass *klass;
klass = (GstAlsaClass *)g_class;
object_class = (GObjectClass *) g_class;
element_class = (GstElementClass *) g_class;
if (parent_class == NULL)
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
object_class->dispose = gst_alsa_dispose;
object_class->get_property = gst_alsa_get_property;
object_class->set_property = gst_alsa_set_property;
g_object_class_install_property (object_class, ARG_DEVICE,
g_param_spec_string ("device", "Device",
"ALSA device, as defined in an asoundrc",
"default", G_PARAM_READWRITE));
g_object_class_install_property (object_class, ARG_PERIODCOUNT,
g_param_spec_int ("period-count", "Period count",
"Number of hardware buffers to use",
2, 64, 2, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, ARG_PERIODSIZE,
g_param_spec_int ("period-size", "Period size",
"Number of frames (samples on each channel) in one hardware period",
2, 8192, 8192, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, ARG_BUFFERSIZE,
g_param_spec_int ("buffer-size", "Buffer size",
"Number of frames the hardware buffer can hold",
4, 65536, 16384, G_PARAM_READWRITE));
g_object_class_install_property (object_class, ARG_AUTORECOVER,
g_param_spec_boolean ("autorecover", "Automatic xrun recovery",
"When TRUE tries to reduce processor load on xruns",
TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, ARG_MMAP,
g_param_spec_boolean ("mmap", "Use mmap'ed access",
"Wether to use mmap (faster) or standard read/write (more compatible)",
TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, ARG_MAXDISCONT,
g_param_spec_uint64 ("max-discont", "Maximum Discontinuity",
"GStreamer timeunits before the timestamp syncing starts dropping/inserting samples",
/* rounding errors */ 1000, GST_SECOND, GST_ALSA_DEFAULT_DISCONT, G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
element_class->change_state = GST_DEBUG_FUNCPTR (gst_alsa_change_state);
element_class->query = GST_DEBUG_FUNCPTR (gst_alsa_query);
element_class->request_new_pad = GST_DEBUG_FUNCPTR (gst_alsa_request_new_pad);
element_class->set_clock = GST_DEBUG_FUNCPTR (gst_alsa_set_clock);
element_class->get_clock = GST_DEBUG_FUNCPTR (gst_alsa_get_clock);
}
static void
gst_alsa_init (GstAlsa *this)
{
this->device = g_strdup("default");
GST_FLAG_SET (this, GST_ELEMENT_EVENT_AWARE);
GST_FLAG_SET (this, GST_ELEMENT_THREAD_SUGGESTED);
}
static void
gst_alsa_dispose (GObject *object)
{
GstAlsa *this = GST_ALSA (object);
g_free (this->device);
if (this->clock)
gst_object_unparent (GST_OBJECT (this->clock));
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_alsa_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstAlsa *this;
gint buffer_size;
this = (GstAlsa *) object;
switch (prop_id) {
case ARG_DEVICE:
if (this->device)
g_free (this->device);
this->device = g_strdup (g_value_get_string (value));
break;
case ARG_PERIODCOUNT:
g_return_if_fail (!GST_FLAG_IS_SET (this, GST_ALSA_RUNNING));
this->period_count = g_value_get_int (value);
break;
case ARG_PERIODSIZE:
g_return_if_fail (!GST_FLAG_IS_SET (this, GST_ALSA_RUNNING));
this->period_size = g_value_get_int (value);
break;
case ARG_BUFFERSIZE:
g_return_if_fail (!GST_FLAG_IS_SET (this, GST_ALSA_RUNNING));
buffer_size = g_value_get_int (value);
this->period_count = buffer_size / this->period_size;
break;
case ARG_AUTORECOVER:
this->autorecover = g_value_get_boolean (value);
return;
case ARG_MMAP:
this->mmap = g_value_get_boolean (value);
return;
case ARG_MAXDISCONT:
this->max_discont = (GstClockTime) g_value_get_uint64 (value);
return;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
return;
}
if (GST_STATE (this) == GST_STATE_NULL)
return;
if (GST_FLAG_IS_SET (this, GST_ALSA_RUNNING)) {
gst_alsa_stop_audio (this);
gst_alsa_start_audio (this);
}
}
static void
gst_alsa_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
GstAlsa *this;
this = (GstAlsa *) object;
switch (prop_id) {
case ARG_DEVICE:
g_value_set_string (value, this->device);
break;
case ARG_PERIODCOUNT:
g_value_set_int (value, this->period_count);
break;
case ARG_PERIODSIZE:
g_value_set_int (value, this->period_size);
break;
case ARG_BUFFERSIZE:
g_value_set_int (value, this->period_size * this->period_count);
break;
case ARG_AUTORECOVER:
g_value_set_boolean (value, this->autorecover);
break;
case ARG_MMAP:
g_value_set_boolean (value, this->mmap);
break;
case ARG_MAXDISCONT:
g_value_set_uint64 (value, (guint64) this->max_discont);
return;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/*** GSTREAMER PAD / QUERY / CONVERSION / STATE FUNCTIONS *********************/
static GstPad *
gst_alsa_request_new_pad (GstElement *element, GstPadTemplate *templ, const gchar *name)
{
GstAlsa *this;
gint track = 0;
g_return_val_if_fail ((this = GST_ALSA (element)), NULL);
g_return_val_if_fail (!GST_FLAG_IS_SET (element, GST_ALSA_RUNNING), NULL);
if (name) {
/* locate the track number in the requested pad name. */
track = (gint) strtol (name + (strchr(templ->name_template, '%') -
templ->name_template), NULL, 0);
if (track < 1 || track >= GST_ALSA_MAX_TRACKS) {
GST_INFO_OBJECT (this, "invalid track requested. (%d)", track);
return NULL;
}
}
/* make sure the requested track is free. */
if (track > 0 || this->pad[track] != NULL) {
GST_INFO_OBJECT (this, "requested track %d already in use.", track);
return NULL;
}
/* if the user doesn't care, use the lowest available track number */
if (track == 0) {
for (track = 1; track < GST_ALSA_MAX_TRACKS; track++) {
if (this->pad[track] != NULL) goto found_track;
}
return NULL;
}
found_track:
this->pad[track] = gst_pad_new_from_template (templ, name);
gst_pad_set_link_function (this->pad[track], gst_alsa_link);
gst_pad_set_getcaps_function (this->pad[track], gst_alsa_get_caps);
gst_element_add_pad (GST_ELEMENT (this), this->pad[track]);
gst_pad_set_convert_function (this->pad[track], gst_alsa_pad_convert);
gst_pad_set_query_function (this->pad[track], gst_alsa_pad_query);
gst_pad_set_query_type_function (this->pad[track], gst_alsa_get_query_types);
gst_pad_set_formats_function (this->pad[track], gst_alsa_get_formats);
return this->pad[track];
}
/* gets the matching alsa format or NULL if none matches */
static GstAlsaFormat *
gst_alsa_get_format (GstCaps *caps)
{
const gchar *mimetype;
GstAlsaFormat *ret;
if (! (ret = g_new (GstAlsaFormat, 1)))
return NULL;
/* we have to differentiate between int and float formats */
mimetype = gst_caps_get_mime (caps);
if (! strncmp (mimetype, "audio/x-raw-int", 15)) {
gboolean sign;
gint width, depth, endianness;
/* extract the needed information from the caps */
if (! gst_caps_get (caps, "width", &width, "depth", &depth, "signed", &sign, NULL))
goto error;
/* extract endianness if needed */
if (width > 8) {
if (! gst_caps_get (caps, "endianness", &endianness, NULL))
goto error;
} else {
endianness = G_BYTE_ORDER;
}
ret->format = snd_pcm_build_linear_format (depth, width, sign ? 0 : 1, endianness == G_LITTLE_ENDIAN ? 0 : 1);
} else if (! strncmp (mimetype, "audio/x-raw-float", 17)) {
gint width;
/* get layout */
if (! gst_caps_get (caps, "width", &width, NULL))
goto error;
/* match layout to format wrt to endianness */
if (width == 32) {
if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
ret->format = SND_PCM_FORMAT_FLOAT_LE;
} else if (G_BYTE_ORDER == G_BIG_ENDIAN) {
ret->format = SND_PCM_FORMAT_FLOAT_BE;
} else {
ret->format = SND_PCM_FORMAT_FLOAT;
}
} else if (width == 64) {
if (G_BYTE_ORDER == G_LITTLE_ENDIAN) {
ret->format = SND_PCM_FORMAT_FLOAT64_LE;
} else if (G_BYTE_ORDER == G_BIG_ENDIAN) {
ret->format = SND_PCM_FORMAT_FLOAT64_BE;
} else {
ret->format = SND_PCM_FORMAT_FLOAT64;
}
} else {
goto error;
}
} else if (! strncmp (mimetype, "audio/x-alaw", 12)) {
ret->format = SND_PCM_FORMAT_A_LAW;
} else if (! strncmp (mimetype, "audio/x-mulaw", 13)) {
ret->format = SND_PCM_FORMAT_MU_LAW;
}
/* get rate and channels */
if (!gst_caps_get (caps, "rate", &ret->rate, "channels", &ret->channels, NULL))
goto error;
return ret;
error:
g_free (ret);
return NULL;
}
static inline gboolean
gst_alsa_formats_match (GstAlsaFormat *one, GstAlsaFormat *two)
{
if (one == two) return TRUE;
if (one == NULL || two == NULL) return FALSE;
return (one->format == two->format) &&
(one->rate == two->rate) &&
(one->channels == two->channels);
}
/* get props for a spec */
static GstCaps *
gst_alsa_get_caps_internal (snd_pcm_format_t format)
{
const gchar *name = snd_pcm_format_name (format);
if (format == SND_PCM_FORMAT_A_LAW) {
return GST_CAPS_NEW (name, "audio/x-alaw",
"law", GST_PROPS_INT(2),
"width", GST_PROPS_INT(8),
"depth", GST_PROPS_INT(8),
"signed", GST_PROPS_BOOLEAN (FALSE),
NULL);
} else if (format == SND_PCM_FORMAT_MU_LAW) {
return GST_CAPS_NEW (name, "audio/x-mulaw",
"law", GST_PROPS_INT(1),
"width", GST_PROPS_INT(8),
"depth", GST_PROPS_INT(8),
"signed", GST_PROPS_BOOLEAN (FALSE),
NULL);
} else if (snd_pcm_format_linear (format)) {
/* int */
GstProps *props =
gst_props_new ("width", GST_PROPS_INT(snd_pcm_format_physical_width (format)),
"depth", GST_PROPS_INT(snd_pcm_format_width (format)),
"law", GST_PROPS_INT(0),
"signed", GST_PROPS_BOOLEAN (snd_pcm_format_signed (format) == 1 ? TRUE : FALSE),
NULL);
/* endianness */
if (snd_pcm_format_physical_width (format) > 8) {
switch (snd_pcm_format_little_endian (format)) {
case 0:
gst_props_add_entry (props, gst_props_entry_new ("endianness", GST_PROPS_INT (G_BIG_ENDIAN)));
break;
case 1:
gst_props_add_entry (props, gst_props_entry_new ("endianness", GST_PROPS_INT (G_LITTLE_ENDIAN)));
break;
default:
GST_WARNING ("Unknown byte order in sound driver. Continuing by assuming system byte order.");
gst_props_add_entry (props, gst_props_entry_new ("endianness", GST_PROPS_INT (G_BYTE_ORDER)));
break;
}
}
return gst_caps_new (name, "audio/x-raw-int", props);
} else if (snd_pcm_format_float (format)) {
/* no float with non-platform endianness */
if (!snd_pcm_format_cpu_endian (format))
return NULL;
return GST_CAPS_NEW (name, "audio/x-raw-float",
"width", GST_PROPS_INT (snd_pcm_format_width (format)),
"endianness", GST_PROPS_INT (G_BYTE_ORDER));
}
return NULL;
}
static inline void
add_channels (GstProps *props, gint min_rate, gint max_rate, gint min_channels, gint max_channels) {
if (min_rate < 0) {
gst_props_add_entry (props, gst_props_entry_new ("rate", GST_PROPS_INT_RANGE (GST_ALSA_MIN_RATE, GST_ALSA_MAX_RATE)));
} else if (max_rate < 0) {
gst_props_add_entry (props, gst_props_entry_new ("rate", GST_PROPS_INT (min_rate)));
} else {
gst_props_add_entry (props, gst_props_entry_new ("rate", GST_PROPS_INT_RANGE (min_rate, max_rate)));
}
if (min_channels < 0) {
gst_props_add_entry (props, gst_props_entry_new ("channels", GST_PROPS_INT_RANGE (1, GST_ALSA_MAX_CHANNELS)));
} else if (max_channels < 0) {
gst_props_add_entry (props, gst_props_entry_new ("channels", GST_PROPS_INT (min_channels)));
} else {
gst_props_add_entry (props, gst_props_entry_new ("channels", GST_PROPS_INT_RANGE (min_channels, max_channels)));
}
}
/**
* Get all available caps.
* @format: SND_PCM_FORMAT_UNKNOWN for all formats, desired format else
* @rate: allowed rates if < 0, else desired rate
* @channels: all allowed values for channels if < 0, else desired channels
*/
GstCaps *
gst_alsa_caps (snd_pcm_format_t format, gint rate, gint channels)
{
GstCaps *ret_caps = NULL;
if (format != SND_PCM_FORMAT_UNKNOWN) {
/* there are some caps set already */
ret_caps = gst_alsa_get_caps_internal (format);
/* we can never use a format we can't set caps for */
g_assert (ret_caps != NULL);
g_assert (ret_caps->properties != NULL);
add_channels (ret_caps->properties, rate, -1, channels, -1);
} else {
int i;
GstCaps *temp;
for (i = 0; i <= SND_PCM_FORMAT_LAST; i++) {
temp = gst_alsa_get_caps_internal (i);
/* can be NULL, because not all alsa formats can be specified as caps */
if (temp != NULL && temp->properties != NULL) {
add_channels (temp->properties, rate, -1, channels, -1);
ret_caps = gst_caps_append (ret_caps, temp);
}
}
}
return ret_caps;
}
/* Return better caps when device is open */
GstCaps *
gst_alsa_get_caps (GstPad *pad, GstCaps *caps)
{
GstAlsa *this;
snd_pcm_hw_params_t *hw_params;
snd_pcm_format_mask_t *mask;
int i;
unsigned int min_rate, max_rate;
gint min_channels, max_channels;
GstCaps *ret = NULL;
g_return_val_if_fail (pad != NULL, NULL);
this = GST_ALSA (gst_pad_get_parent (pad));
if (!GST_FLAG_IS_SET (this, GST_ALSA_OPEN))
return gst_pad_get_pad_template_caps (pad);
snd_pcm_hw_params_alloca (&hw_params);
ERROR_CHECK (snd_pcm_hw_params_any (this->handle, hw_params),
"Broken configuration for this PCM: %s");
if (((GstElement *) this)->numpads > 1) {
min_channels = 1;
max_channels = -1;
} else {
ERROR_CHECK (snd_pcm_hw_params_get_channels_min (hw_params, &min_rate),
"Couldn't get minimum channel count for device %s: %s", this->device);
ERROR_CHECK (snd_pcm_hw_params_get_channels_max (hw_params, &max_rate),
"Couldn't get maximum channel count for device %s: %s", this->device);
min_channels = min_rate;
max_channels = max_rate > GST_ALSA_MAX_CHANNELS ? GST_ALSA_MAX_CHANNELS : max_rate;
}
ERROR_CHECK (snd_pcm_hw_params_get_rate_min (hw_params, &min_rate, &i),
"Couldn't get minimum rate for device %s: %s", this->device);
min_rate = min_rate < GST_ALSA_MIN_RATE ? GST_ALSA_MIN_RATE : min_rate + i;
ERROR_CHECK (snd_pcm_hw_params_get_rate_max (hw_params, &max_rate, &i),
"Couldn't get maximum rate for device %s: %s", this->device);
max_rate = max_rate > GST_ALSA_MAX_RATE ? GST_ALSA_MAX_RATE : max_rate + i;
snd_pcm_format_mask_alloca (&mask);
snd_pcm_hw_params_get_format_mask (hw_params, mask);
for (i = 0; i <= SND_PCM_FORMAT_LAST; i++) {
if (snd_pcm_format_mask_test (mask, i)) {
GstCaps *caps = gst_alsa_get_caps_internal (i);
/* we can never use a format we can't set caps for */
if (caps != NULL && caps->properties != NULL) {
add_channels (caps->properties, min_rate, max_rate, min_channels, max_channels);
ret = gst_caps_append (ret, caps);
}
}
}
return ret;
}
/* Negotiates the caps */
GstPadLinkReturn
gst_alsa_link (GstPad *pad, GstCaps *caps)
{
GstAlsa *this;
GstAlsaFormat *format;
GstPadLinkReturn ret;
g_return_val_if_fail (caps != NULL, GST_PAD_LINK_REFUSED);
g_return_val_if_fail (pad != NULL, GST_PAD_LINK_REFUSED);
this = GST_ALSA (gst_pad_get_parent (pad));
if (GST_CAPS_IS_FIXED (caps)) {
if (this->handle == NULL && ! gst_alsa_open_audio (this))
return GST_PAD_LINK_REFUSED;
format = gst_alsa_get_format (caps);
if (format == NULL)
return GST_PAD_LINK_DELAYED;
GST_DEBUG ("found format %s", snd_pcm_format_name (format->format));
if (! GST_FLAG_IS_SET (this, GST_ALSA_CAPS_NEGO)) {
gint i;
GST_FLAG_SET (this, GST_ALSA_CAPS_NEGO);
if (gst_alsa_formats_match (this->format, format)) {
ret = GST_PAD_LINK_OK;
goto out;
}
if (! gst_alsa_probe_hw_params (this, format)) {
ret = GST_PAD_LINK_REFUSED;
goto out;
}
for (i = 0; i < ((GstElement *) this)->numpads; i++) {
g_assert (this->pad[i] != NULL);
if (this->pad[i] == pad) continue;
if (gst_pad_try_set_caps (this->pad[i], gst_caps_ref (caps)) == GST_PAD_LINK_REFUSED) {
if (this->format) {
GstCaps *old = gst_alsa_caps (this->format->format, this->format->rate, this->format->channels);
for (--i; i >= 0; i--) {
if (gst_pad_try_set_caps (this->pad[i], gst_caps_ref (old)) == GST_PAD_LINK_REFUSED) {
gst_element_error (GST_ELEMENT (this), "error resetting caps to sane value");
gst_caps_unref (old);
break;
}
}
gst_caps_unref (old);
} else {
/* FIXME: unset caps on pads somehow */
}
ret = GST_PAD_LINK_REFUSED;
goto out;
}
}
GST_FLAG_UNSET (this, GST_ALSA_CAPS_NEGO);
/* sync the params */
if (GST_FLAG_IS_SET (this, GST_ALSA_RUNNING)) gst_alsa_stop_audio (this);
g_free (this->format);
this->format = format;
if (! gst_alsa_start_audio (this)) {
gst_element_error (GST_ELEMENT (this), "Probed format doesn't work");
return GST_PAD_LINK_REFUSED;
}
}
return GST_PAD_LINK_OK;
}
return GST_PAD_LINK_DELAYED;
out:
g_free (format);
GST_FLAG_UNSET (this, GST_ALSA_CAPS_NEGO);
return ret;
}
static GstElementStateReturn
gst_alsa_change_state (GstElement *element)
{
int err;
GstAlsa *this;
g_return_val_if_fail (element != NULL, FALSE);
this = GST_ALSA (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
if (! (GST_FLAG_IS_SET (element, GST_ALSA_OPEN) ||
gst_alsa_open_audio (this))) return GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_PAUSED:
if (! (GST_FLAG_IS_SET (element, GST_ALSA_RUNNING) ||
gst_alsa_start_audio (this))) return GST_STATE_FAILURE;
this->transmitted = 0;
break;
case GST_STATE_PAUSED_TO_PLAYING:
if (snd_pcm_state (this->handle) == SND_PCM_STATE_PAUSED) {
if ((err = snd_pcm_pause (this->handle, 0)) < 0) {
GST_ERROR_OBJECT (this, "Error unpausing sound: %s", snd_strerror (err));
return GST_STATE_FAILURE;
}
gst_alsa_clock_start (this->clock);
}
break;
case GST_STATE_PLAYING_TO_PAUSED:
if (GST_ALSA_CAPS_IS_SET (this, GST_ALSA_CAPS_PAUSE)) {
if (snd_pcm_state (this->handle) == SND_PCM_STATE_RUNNING) {
if ((err = snd_pcm_pause (this->handle, 1)) < 0) {
GST_ERROR_OBJECT (this, "Error pausing sound: %s", snd_strerror (err));
return GST_STATE_FAILURE;
}
gst_alsa_clock_stop (this->clock);
}
break;
}
/* if device doesn't know how to pause, we just stop */
case GST_STATE_PAUSED_TO_READY:
if (GST_FLAG_IS_SET (element, GST_ALSA_RUNNING)) gst_alsa_stop_audio (this);
g_free (this->format);
this->format = NULL;
break;
case GST_STATE_READY_TO_NULL:
if (GST_FLAG_IS_SET (element, GST_ALSA_OPEN)) gst_alsa_close_audio (this);
break;
default:
g_assert_not_reached();
}
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static GstClock *
gst_alsa_get_clock (GstElement *element)
{ return GST_CLOCK (GST_ALSA (element)->clock); }
static void
gst_alsa_set_clock (GstElement *element, GstClock *clock)
{ /* we need this function just so everybody knows we use a clock */ }
/*** AUDIO PROCESSING *********************************************************/
inline snd_pcm_sframes_t
gst_alsa_update_avail (GstAlsa *this)
{
snd_pcm_sframes_t avail = snd_pcm_avail_update (this->handle);
if (avail < 0) {
if (avail == -EPIPE) {
gst_alsa_xrun_recovery (this);
} else {
GST_WARNING_OBJECT (this, "unknown ALSA avail_update return value (%d)", (int) avail);
}
}
return avail;
}
/* returns TRUE, if the loop should go on */
inline gboolean
gst_alsa_pcm_wait (GstAlsa *this)
{
int err;
if (snd_pcm_state (this->handle) == SND_PCM_STATE_RUNNING) {
if ((err = snd_pcm_wait (this->handle, 1000)) < 0) {
if (err == EINTR) {
/* happens mostly when run under gdb, or when exiting due to a signal */
GST_DEBUG ("got interrupted while waiting");
if (gst_element_interrupt (GST_ELEMENT (this))) {
return TRUE;
} else {
return FALSE;
}
}
GST_ERROR_OBJECT (this, "error waiting for alsa pcm: (%d: %s)", err, snd_strerror (err));
return FALSE;
}
}
return TRUE;
}
/**
* error out or make sure we're in SND_PCM_STATE_RUNNING afterwards
* return FALSE if we're not
*/
inline gboolean
gst_alsa_start (GstAlsa *this)
{
GST_DEBUG ("Setting state to RUNNING");
switch (snd_pcm_state(this->handle)) {
case SND_PCM_STATE_XRUN:
gst_alsa_xrun_recovery (this);
return gst_alsa_start (this);
case SND_PCM_STATE_SETUP:
ERROR_CHECK (snd_pcm_prepare (this->handle), "error preparing: %s");
case SND_PCM_STATE_SUSPENDED:
case SND_PCM_STATE_PREPARED:
ERROR_CHECK (snd_pcm_start(this->handle), "error starting playback: %s");
break;
case SND_PCM_STATE_PAUSED:
ERROR_CHECK (snd_pcm_pause (this->handle, 0), "error unpausing: %s");
break;
case SND_PCM_STATE_RUNNING:
break;
case SND_PCM_STATE_DRAINING:
case SND_PCM_STATE_OPEN:
/* this probably happens when someone replugged a pipeline and we're in a
really weird state because our cothread wasn't busted */
return FALSE;
default:
/* it's a bug when we get here */
g_assert_not_reached ();
break;
}
gst_alsa_clock_start (this->clock);
return TRUE;
}
void
gst_alsa_xrun_recovery (GstAlsa *this)
{
snd_pcm_status_t *status;
gint err;
snd_pcm_status_alloca (&status);
if ((err = snd_pcm_status (this->handle, status)) < 0)
GST_ERROR_OBJECT (this, "status error: %s", snd_strerror (err));
if (snd_pcm_status_get_state (status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday (&now, 0);
snd_pcm_status_get_trigger_tstamp (status, &tstamp);
timersub (&now, &tstamp, &diff);
GST_INFO_OBJECT (this, "alsa: xrun of at least %.3f msecs", diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
/* if we're allowed to recover, ... */
if (this->autorecover) {
/* ... then increase the period size or buffer size / period count to
prevent further xruns (at the cost of increased latency and memory
usage). */
if (this->period_count >= 4) {
this->period_size *= 2;
this->period_count /= 2;
} else {
this->period_count *= 2;
}
}
}
if (!(gst_alsa_stop_audio (this) && gst_alsa_start_audio (this))) {
gst_element_error (GST_ELEMENT (this), "alsasink: Error restarting audio after xrun");
}
}
/*** AUDIO SETUP / START / STOP ***********************************************/
void
gst_alsa_set_eos (GstAlsa *this)
{
gst_alsa_drain_audio (this);
gst_element_set_eos (GST_ELEMENT (this));
}
static gboolean
gst_alsa_open_audio (GstAlsa *this)
{
g_assert (this != NULL);
g_assert (this->handle == NULL);
GST_INFO ( "Opening alsa device \"%s\"...\n", this->device);
ERROR_CHECK (snd_output_stdio_attach (&this->out, stderr, 0),
"error opening log output: %s");
/* we use non-blocking i/o */
ERROR_CHECK (snd_pcm_open (&this->handle, this->device,
GST_ALSA_GET_CLASS (this)->stream, SND_PCM_NONBLOCK),
"error opening pcm device %s: %s\n", this->device);
GST_FLAG_SET (this, GST_ALSA_OPEN);
return TRUE;
}
/* if someone finds an easy way to merge this with _set_hw_params, go ahead */
static gboolean
gst_alsa_probe_hw_params (GstAlsa *this, GstAlsaFormat *format)
{
snd_pcm_hw_params_t *hw_params;
snd_pcm_access_mask_t *mask;
snd_pcm_uframes_t period_size;
unsigned int period_count;
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (format != NULL, FALSE);
GST_INFO ( "Probing format: %s %dHz, %d channels\n",
snd_pcm_format_name (format->format), format->rate, format->channels);
snd_pcm_hw_params_alloca (&hw_params);
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_any (this->handle, hw_params));
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_periods_integer (this->handle, hw_params));
/* enable this for soundcard specific debugging */
/* snd_pcm_hw_params_dump (hw_params, this->out); */
mask = alloca (snd_pcm_access_mask_sizeof ());
snd_pcm_access_mask_none (mask);
if (GST_ELEMENT (this)->numpads == 1) {
snd_pcm_access_mask_set (mask, this->mmap ? SND_PCM_ACCESS_MMAP_INTERLEAVED : SND_PCM_ACCESS_RW_INTERLEAVED);
} else {
snd_pcm_access_mask_set (mask, this->mmap ? SND_PCM_ACCESS_MMAP_NONINTERLEAVED : SND_PCM_ACCESS_RW_NONINTERLEAVED);
}
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_access_mask (this->handle, hw_params, mask));
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_format (this->handle, hw_params, format->format));
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_channels (this->handle, hw_params, format->channels));
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_rate (this->handle, hw_params, format->rate, 0));
period_count = this->period_count;
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_periods_near (this->handle, hw_params, &period_count, 0));
period_size = this->period_size;
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_period_size_near (this->handle, hw_params, &period_size, 0));
return TRUE;
}
/**
* You must set all hw parameters at once and can't use already set params and
* change them.
* Thx ALSA for not documenting this
*/
static gboolean
gst_alsa_set_hw_params (GstAlsa *this)
{
snd_pcm_hw_params_t *hw_params;
snd_pcm_access_mask_t *mask;
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (this->handle != NULL, FALSE);
if (this->format) {
GST_INFO ( "Preparing format: %s %dHz, %d channels",
snd_pcm_format_name (this->format->format), this->format->rate, this->format->channels);
} else {
GST_INFO ( "Preparing format: (none)");
}
snd_pcm_hw_params_alloca (&hw_params);
ERROR_CHECK (snd_pcm_hw_params_any (this->handle, hw_params),
"Broken configuration for this PCM: %s");
ERROR_CHECK (snd_pcm_hw_params_set_periods_integer (this->handle, hw_params),
"cannot restrict period size to integral value: %s");
/* enable this for soundcard specific debugging */
/* snd_pcm_hw_params_dump (hw_params, this->out); */
mask = alloca (snd_pcm_access_mask_sizeof ());
snd_pcm_access_mask_none (mask);
if (GST_ELEMENT (this)->numpads == 1) {
snd_pcm_access_mask_set (mask, this->mmap ? SND_PCM_ACCESS_MMAP_INTERLEAVED : SND_PCM_ACCESS_RW_INTERLEAVED);
} else {
snd_pcm_access_mask_set (mask, this->mmap ? SND_PCM_ACCESS_MMAP_NONINTERLEAVED : SND_PCM_ACCESS_RW_NONINTERLEAVED);
}
ERROR_CHECK (snd_pcm_hw_params_set_access_mask (this->handle, hw_params, mask),
"The Gstreamer ALSA plugin does not support your hardware. Error: %s");
if (this->format) {
ERROR_CHECK (snd_pcm_hw_params_set_format (this->handle, hw_params, this->format->format),
"Sample format (%s) not available: %s", snd_pcm_format_name (this->format->format));
ERROR_CHECK (snd_pcm_hw_params_set_channels (this->handle, hw_params, this->format->channels),
"Channels count (%d) not available: %s", this->format->channels);
ERROR_CHECK (snd_pcm_hw_params_set_rate (this->handle, hw_params, this->format->rate, 0),
"error setting rate (%d): %s", this->format->rate);
}
ERROR_CHECK (snd_pcm_hw_params_set_periods_near (this->handle, hw_params, &this->period_count, 0),
"error setting buffer size to %u: %s", (guint) this->period_count);
ERROR_CHECK (snd_pcm_hw_params_set_period_size_near (this->handle, hw_params, &this->period_size, 0),
"error setting period size to %u frames: %s", (guint) this->period_size);
ERROR_CHECK (snd_pcm_hw_params (this->handle, hw_params),
"Could not set hardware parameters: %s");
/* now get the pcm caps */
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_PAUSE, snd_pcm_hw_params_can_pause (hw_params));
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_RESUME, snd_pcm_hw_params_can_resume (hw_params));
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_SYNC_START, snd_pcm_hw_params_can_sync_start (hw_params));
if (this->mmap) {
this->transmit = GST_ALSA_GET_CLASS (this)->transmit_mmap;
} else {
this->transmit = GST_ALSA_GET_CLASS (this)->transmit_rw;
}
return TRUE;
}
static gboolean
gst_alsa_set_sw_params (GstAlsa *this)
{
snd_pcm_sw_params_t *sw_params;
snd_pcm_sw_params_alloca (&sw_params);
ERROR_CHECK (snd_pcm_sw_params_current (this->handle, sw_params),
"Could not get current software parameters: %s");
ERROR_CHECK (snd_pcm_sw_params_set_silence_size (this->handle, sw_params, 0),
"could not set silence size: %s");
ERROR_CHECK (snd_pcm_sw_params_set_silence_threshold (this->handle, sw_params, 0),
"could not set silence threshold: %s");
ERROR_CHECK (snd_pcm_sw_params_set_avail_min (this->handle, sw_params, this->period_size),
"could not set avail min: %s");
/* we start explicitly */
ERROR_CHECK (snd_pcm_sw_params_set_start_threshold (this->handle, sw_params, this->period_size * this->period_count + 1),
"could not set start mode: %s");
ERROR_CHECK (snd_pcm_sw_params_set_stop_threshold (this->handle, sw_params, this->period_size * this->period_count),
"could not set stop mode: %s");
ERROR_CHECK (snd_pcm_sw_params_set_xfer_align(this->handle, sw_params, 1),
"Unable to set transfer align for playback: %s");
ERROR_CHECK (snd_pcm_sw_params (this->handle, sw_params),
"could not set sw_params: %s");
return TRUE;
}
static gboolean
gst_alsa_start_audio (GstAlsa *this)
{
g_assert (GST_FLAG_IS_SET (this, GST_ALSA_OPEN));
if (!gst_alsa_set_hw_params (this))
return FALSE;
if (!gst_alsa_set_sw_params (this))
return FALSE;
GST_FLAG_SET (this, GST_ALSA_RUNNING);
return TRUE;
}
static gboolean
gst_alsa_drain_audio (GstAlsa *this)
{
g_assert (this != NULL);
g_return_val_if_fail (this->handle != NULL, FALSE);
GST_DEBUG ("stopping alsa");
switch (snd_pcm_state (this->handle)) {
case SND_PCM_STATE_XRUN:
case SND_PCM_STATE_RUNNING:
gst_alsa_clock_stop (this->clock);
/* fall through - clock is already stopped when paused */
case SND_PCM_STATE_PAUSED:
/* snd_pcm_drain only works in blocking mode */
ERROR_CHECK (snd_pcm_nonblock(this->handle, 0), "couldn't set blocking mode: %s");
ERROR_CHECK (snd_pcm_drain (this->handle), "couldn't stop and drain buffer: %s");
ERROR_CHECK (snd_pcm_nonblock(this->handle, 1), "couldn't set non-blocking mode: %s");
break;
default:
break;
}
GST_FLAG_UNSET (this, GST_ALSA_RUNNING);
return TRUE;
}
static gboolean
gst_alsa_stop_audio (GstAlsa *this)
{
g_assert (this != NULL);
g_return_val_if_fail (this->handle != NULL, FALSE);
GST_DEBUG ("stopping alsa, skipping pending frames");
switch (snd_pcm_state (this->handle)) {
case SND_PCM_STATE_XRUN:
case SND_PCM_STATE_RUNNING:
gst_alsa_clock_stop (this->clock);
/* fall through - clock is already stopped when paused */
case SND_PCM_STATE_PAUSED:
ERROR_CHECK (snd_pcm_drop (this->handle),
"couldn't stop (dropping frames): %s");
break;
default:
break;
}
GST_FLAG_UNSET (this, GST_ALSA_RUNNING);
return TRUE;
}
static gboolean
gst_alsa_close_audio (GstAlsa *this)
{
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (this->handle != NULL, FALSE);
ERROR_CHECK (snd_pcm_close (this->handle), "Error closing device: %s");
this->handle = NULL;
GST_FLAG_UNSET (this, GST_ALSA_OPEN);
return TRUE;
}
/*** QUERYING/FORMAT/CONVERSION FUNCTIONS *************************************/
static const GstFormat *
gst_alsa_get_formats (GstPad *pad)
{
static const GstFormat formats[] = {
GST_FORMAT_TIME,
GST_FORMAT_DEFAULT,
GST_FORMAT_BYTES,
0
};
return formats;
}
static gboolean
gst_alsa_pad_convert (GstPad *pad, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
return gst_alsa_convert (GST_ALSA (GST_PAD_PARENT (pad)), src_format, src_value, dest_format, dest_value);
}
static gboolean
gst_alsa_convert (GstAlsa *this, GstFormat src_format, gint64 src_value,
GstFormat *dest_format, gint64 *dest_value)
{
gboolean res = TRUE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
if (this->format == NULL)
return FALSE;
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value = gst_alsa_bytes_to_samples (this, (guint) src_value);
break;
case GST_FORMAT_TIME:
*dest_value = gst_alsa_bytes_to_timestamp (this, (guint) src_value);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_DEFAULT:
*dest_value = gst_alsa_timestamp_to_samples (this, (GstClockTime) src_value);
break;
case GST_FORMAT_BYTES:
*dest_value = gst_alsa_timestamp_to_bytes (this, (GstClockTime) src_value);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = gst_alsa_samples_to_timestamp (this, (guint) src_value);
break;
case GST_FORMAT_BYTES:
*dest_value = gst_alsa_samples_to_bytes (this, (guint) src_value);
break;
case GST_FORMAT_DEFAULT:
g_assert_not_reached ();
/* fall through */
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstQueryType *
gst_alsa_get_query_types (GstPad *pad)
{
static const GstQueryType query_types[] = {
GST_QUERY_LATENCY,
GST_QUERY_POSITION,
0,
};
return query_types;
}
static gboolean
gst_alsa_query_func (GstElement *element, GstQueryType type, GstFormat *format, gint64 *value)
{
gboolean res = FALSE;
GstAlsa *this = GST_ALSA (element);
switch (type) {
case GST_QUERY_LATENCY: {
snd_pcm_sframes_t delay;
ERROR_CHECK (snd_pcm_delay (this->handle, &delay), "Error getting delay: %s");
res = gst_alsa_convert (this, GST_FORMAT_DEFAULT, (gint64) delay, format, value);
break;
}
case GST_QUERY_POSITION:
res = gst_alsa_convert (this, GST_FORMAT_DEFAULT, this->transmitted, format, value);
break;
default:
break;
}
return res;
}
static gboolean
gst_alsa_query (GstElement *element, GstQueryType type, GstFormat *format, gint64 *value)
{
return gst_alsa_pad_query (GST_ALSA (element)->pad[0], type, format, value);
}
static gboolean
gst_alsa_pad_query (GstPad *pad, GstQueryType type, GstFormat *format, gint64 *value)
{
if (gst_alsa_query_func (GST_PAD_PARENT (pad), type, format, value))
return TRUE;
if (GST_PAD_DIRECTION (pad) == GST_PAD_SINK && gst_pad_query (gst_pad_get_peer (pad), type, format, value))
return TRUE;
return FALSE;
}
inline snd_pcm_uframes_t
gst_alsa_timestamp_to_samples (GstAlsa *this, GstClockTime time)
{
return (snd_pcm_uframes_t) ((time * this->format->rate + this->format->rate / 2) / GST_SECOND);
}
inline GstClockTime
gst_alsa_samples_to_timestamp (GstAlsa *this, snd_pcm_uframes_t samples)
{
return (GstClockTime) (samples * GST_SECOND / this->format->rate);
}
inline snd_pcm_uframes_t
gst_alsa_bytes_to_samples (GstAlsa *this, guint bytes)
{
return bytes / (snd_pcm_format_physical_width (this->format->format) / 8) / (GST_ELEMENT (this)->numpads == 1 ? this->format->channels : 1);
}
inline guint
gst_alsa_samples_to_bytes (GstAlsa *this, snd_pcm_uframes_t samples)
{
return samples * snd_pcm_format_physical_width (this->format->format) / 8 * (GST_ELEMENT (this)->numpads == 1 ? this->format->channels : 1);
}
inline GstClockTime
gst_alsa_bytes_to_timestamp (GstAlsa *this, guint bytes)
{
return gst_alsa_samples_to_timestamp (this, gst_alsa_bytes_to_samples (this, bytes));
}
inline guint
gst_alsa_timestamp_to_bytes (GstAlsa *this, GstClockTime time)
{
return gst_alsa_samples_to_bytes (this, gst_alsa_timestamp_to_samples (this, time));
}
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