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gstreamer/ext/alsa/gstalsa.c
Wim Taymans a48818210d ext/alsa/: Make the xrun code timestamp and offset the buffers correctly. moved the clock to the base class, use alsa... 
Original commit message from CVS:
* ext/alsa/gstalsa.c: (gst_alsa_init), (gst_alsa_dispose),
(gst_alsa_get_time), (gst_alsa_xrun_recovery):
* ext/alsa/gstalsa.h:
* ext/alsa/gstalsaclock.c: (gst_alsa_clock_get_type):
* ext/alsa/gstalsasrc.c: (gst_alsa_src_init), (gst_alsa_src_loop),
(gst_alsa_src_change_state):
* ext/alsa/gstalsasrc.h:
Make the xrun code timestamp and offset the buffers correctly.
moved the clock to the base class, use alsa methods to get time.
Do correct timestamping on outgoing buffers.
2004-06-17 14:10:21 +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 "gst/gst-i18n-plugin.h"
#include "gst/propertyprobe/propertyprobe.h"
#include "gstalsa.h"
#include "gstalsaclock.h"
#include "gstalsamixer.h"
#define ALSA_DEBUG_FLUSH(this) G_STMT_START{ \
gchar *__str; \
ssize_t __size; \
__size = snd_output_buffer_string (this->out, &__str); \
if (__size > 0) { \
GST_DEBUG_OBJECT (this, "%*s", __size, __str); \
if (snd_output_flush (this->out) != 0) \
GST_ERROR_OBJECT (this, "error flushing output buffer"); \
} \
}G_STMT_END
/* 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);
/* interface */
static void gst_alsa_probe_interface_init (GstPropertyProbeInterface * iface);
/* 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,
};
static const GInterfaceInfo alsa_probe_info = {
(GInterfaceInitFunc) gst_alsa_probe_interface_init,
NULL,
NULL
};
alsa_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstAlsa", &alsa_info, 0);
g_type_add_interface_static (alsa_type,
GST_TYPE_PROPERTY_PROBE, &alsa_probe_info);
}
return alsa_type;
}
/*** GOBJECT FUNCTIONS ********************************************************/
enum
{
ARG_0,
ARG_DEVICE,
ARG_DEVICE_NAME,
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_DEVICE_NAME,
g_param_spec_string ("device_name", "Device name",
"Name of the device", NULL, G_PARAM_READABLE));
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");
g_assert (snd_pcm_status_malloc (&(this->status)) == 0);
this->clock = gst_alsa_clock_new ("alsaclock", gst_alsa_get_time, this);
/* we hold a ref to our clock until we're disposed */
gst_object_ref (GST_OBJECT (this->clock));
gst_object_sink (GST_OBJECT (this->clock));
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);
this->device = NULL;
snd_pcm_status_free (this->status);
this->status = NULL;
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_DEVICE_NAME:
g_value_set_string (value, this->cardname);
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;
}
}
/**
* ask ALSA for current time using htstamp
* FIXME: This is not very accurate, should use alsa timers instead.
* htstamp seems to use the system clock instead of the hw clock.
*/
GstClockTime
gst_alsa_get_time (GstAlsa * this)
{
int err;
snd_htimestamp_t timestamp;
GstClockTime time;
if ((err = snd_pcm_status (this->handle, this->status)) < 0) {
GST_WARNING_OBJECT (this, "could not get snd_pcm_status");
}
snd_pcm_status_get_htstamp (this->status, &timestamp);
/* time = GST_TIMESPEC_TO_TIME (timestamp); */
time = timestamp.tv_sec * GST_SECOND + timestamp.tv_nsec * GST_NSECOND;
GST_LOG_OBJECT (this, "ALSA reports time of %" GST_TIME_FORMAT,
GST_TIME_ARGS (time));
return time;
}
static const GList *
gst_alsa_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
static GList *list = NULL;
if (!list) {
list = g_list_append (NULL, g_object_class_find_property (klass, "device"));
}
return list;
}
static void
device_list (snd_pcm_stream_t stream, GstAlsaClass * klass)
{
snd_ctl_t *handle;
int card, err, dev;
snd_ctl_card_info_t *info;
snd_pcm_info_t *pcminfo;
gboolean mixer = (stream == -1);
if (stream == -1)
stream = 0;
snd_ctl_card_info_alloca (&info);
snd_pcm_info_alloca (&pcminfo);
card = -1;
if (snd_card_next (&card) < 0 || card < 0) {
/* no soundcard found */
return;
}
while (card >= 0) {
char name[32];
sprintf (name, "hw:%d", card);
if ((err = snd_ctl_open (&handle, name, 0)) < 0) {
goto next_card;
}
if ((err = snd_ctl_card_info (handle, info)) < 0) {
snd_ctl_close (handle);
goto next_card;
}
if (mixer) {
klass->devices = g_list_append (klass->devices, g_strdup (name));
} else {
dev = -1;
while (1) {
gchar *gst_device;
snd_ctl_pcm_next_device (handle, &dev);
if (dev < 0)
break;
snd_pcm_info_set_device (pcminfo, dev);
snd_pcm_info_set_subdevice (pcminfo, 0);
snd_pcm_info_set_stream (pcminfo, stream);
if ((err = snd_ctl_pcm_info (handle, pcminfo)) < 0) {
continue;
}
gst_device = g_strdup_printf ("hw:%d,%d", card, dev);
klass->devices = g_list_append (klass->devices, gst_device);
}
}
snd_ctl_close (handle);
next_card:
if (snd_card_next (&card) < 0) {
break;
}
}
}
static gboolean
gst_alsa_class_probe_devices (GstAlsaClass * klass, gboolean check)
{
static gboolean init = FALSE;
/* I'm pretty sure ALSA has a good way to do this. However, their cool
* auto-generated documentation is pretty much useless if you try to
* do function-wise look-ups. */
if (!init && !check) {
snd_pcm_stream_t mode = -1;
const GList *templates;
/* we assume one pad template at max [zero=mixer] */
templates =
gst_element_class_get_pad_template_list (GST_ELEMENT_CLASS (klass));
if (templates) {
if (GST_PAD_TEMPLATE_DIRECTION (templates->data) == GST_PAD_SRC)
mode = SND_PCM_STREAM_CAPTURE;
else
mode = SND_PCM_STREAM_PLAYBACK;
}
device_list (mode, klass);
init = TRUE;
}
return init;
}
static GValueArray *
gst_alsa_class_list_devices (GstAlsaClass * klass)
{
GValueArray *array;
GValue value = { 0 };
GList *item;
if (!klass->devices)
return NULL;
array = g_value_array_new (g_list_length (klass->devices));
g_value_init (&value, G_TYPE_STRING);
for (item = klass->devices; item != NULL; item = item->next) {
g_value_set_string (&value, item->data);
g_value_array_append (array, &value);
}
g_value_unset (&value);
return array;
}
static void
gst_alsa_probe_probe_property (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstAlsaClass *klass = GST_ALSA_GET_CLASS (probe);
switch (prop_id) {
case ARG_DEVICE:
gst_alsa_class_probe_devices (klass, FALSE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
}
static gboolean
gst_alsa_probe_needs_probe (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstAlsaClass *klass = GST_ALSA_GET_CLASS (probe);
gboolean ret = FALSE;
switch (prop_id) {
case ARG_DEVICE:
ret = !gst_alsa_class_probe_devices (klass, TRUE);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return ret;
}
static GValueArray *
gst_alsa_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GstAlsaClass *klass = GST_ALSA_GET_CLASS (probe);
GValueArray *array = NULL;
switch (prop_id) {
case ARG_DEVICE:
array = gst_alsa_class_list_devices (klass);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
static void
gst_alsa_probe_interface_init (GstPropertyProbeInterface * iface)
{
iface->get_properties = gst_alsa_probe_get_properties;
iface->probe_property = gst_alsa_probe_probe_property;
iface->needs_probe = gst_alsa_probe_needs_probe;
iface->get_values = gst_alsa_probe_get_values;
}
/*** 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_pad_set_fixate_function (this->pad[track], gst_alsa_fixate);
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 (const GstStructure * structure)
{
const gchar *mimetype;
GstAlsaFormat *ret;
if (!(ret = g_new (GstAlsaFormat, 1)))
return NULL;
/* we have to differentiate between int and float formats */
mimetype = gst_structure_get_name (structure);
if (!strncmp (mimetype, "audio/x-raw-int", 15)) {
gboolean sign;
gint width, depth, endianness;
/* extract the needed information from the cap */
if (!(gst_structure_get_int (structure, "width", &width) &&
gst_structure_get_int (structure, "depth", &depth) &&
gst_structure_get_boolean (structure, "signed", &sign)))
goto error;
/* extract endianness if needed */
if (width > 8) {
if (!gst_structure_get_int (structure, "endianness", &endianness))
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_structure_get_int (structure, "width", &width))
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_structure_get_int (structure, "rate", &ret->rate) &&
gst_structure_get_int (structure, "channels", &ret->channels)))
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)
{
if (format == SND_PCM_FORMAT_A_LAW) {
return gst_caps_new_simple ("audio/x-alaw", NULL);
} else if (format == SND_PCM_FORMAT_MU_LAW) {
return gst_caps_new_simple ("audio/x-mulaw", NULL);
} else if (snd_pcm_format_linear (format)) {
/* int */
GstStructure *structure = gst_structure_new ("audio/x-raw-int",
"width", G_TYPE_INT, (gint) snd_pcm_format_physical_width (format),
"depth", G_TYPE_INT, (gint) snd_pcm_format_width (format),
"signed", G_TYPE_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_structure_set (structure, "endianness", G_TYPE_INT, G_BIG_ENDIAN,
NULL);
break;
case 1:
gst_structure_set (structure, "endianness", G_TYPE_INT,
G_LITTLE_ENDIAN, NULL);
break;
default:
GST_WARNING
("Unknown byte order in sound driver. Continuing by assuming system byte order.");
gst_structure_set (structure, "endianness", G_TYPE_INT, G_BYTE_ORDER,
NULL);
break;
}
}
return gst_caps_new_full (structure, NULL);
} 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_simple ("audio/x-raw-float",
"width", G_TYPE_INT, (gint) snd_pcm_format_width (format),
"endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
}
return NULL;
}
static inline void
add_channels (GstStructure * structure, gint min_rate, gint max_rate,
gint min_channels, gint max_channels)
{
if (min_rate < 0) {
min_rate = GST_ALSA_MIN_RATE;
max_rate = GST_ALSA_MAX_RATE;
}
if (max_rate < 0 || min_rate == max_rate) {
gst_structure_set (structure, "rate", G_TYPE_INT, min_rate, NULL);
} else {
/* just to be sure */
if (min_rate > max_rate) {
gint temp;
GST_ERROR
("minimum rate > maximum rate (%d > %d), please fix your soundcard drivers",
min_rate, max_rate);
temp = min_rate;
min_rate = max_rate;
max_rate = temp;
}
gst_structure_set (structure, "rate", GST_TYPE_INT_RANGE, min_rate,
max_rate, NULL);
}
if (min_channels < 0) {
min_channels = 1;
max_channels = GST_ALSA_MAX_CHANNELS;
}
if (max_channels < 0 || min_channels == max_channels) {
gst_structure_set (structure, "channels", G_TYPE_INT, min_channels, NULL);
} else {
/* just to be sure */
if (min_channels > max_channels) {
gint temp;
GST_ERROR
("minimum channels > maximum channels (%d > %d), please fix your soundcard drivers",
min_channels, max_channels);
temp = min_channels;
min_channels = max_channels;
max_channels = temp;
}
gst_structure_set (structure, "channels", GST_TYPE_INT_RANGE,
min_channels, max_channels, NULL);
}
}
/**
* 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;
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 (gst_caps_get_size (ret_caps) == 1);
add_channels (gst_caps_get_structure (ret_caps, 0), rate, -1, channels, -1);
} else {
int i;
GstCaps *temp;
ret_caps = gst_caps_new_empty ();
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) {
g_assert (gst_caps_get_size (temp) == 1);
add_channels (gst_caps_get_structure (temp, 0), rate, -1, channels, -1);
gst_caps_append (ret_caps, temp);
}
}
}
gst_caps_do_simplify (ret_caps);
return ret_caps;
}
/* Return better caps when device is open */
GstCaps *
gst_alsa_get_caps (GstPad * pad)
{
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_caps_copy (GST_PAD_TEMPLATE_CAPS (GST_PAD_PAD_TEMPLATE (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) {
g_assert (gst_caps_get_size (caps) == 1);
add_channels (gst_caps_get_structure (caps, 0), min_rate, max_rate,
min_channels, max_channels);
if (ret) {
gst_caps_append (ret, caps);
} else {
ret = caps;
}
}
}
}
if (ret == NULL) {
GST_WARNING_OBJECT (this, "no supported caps found, returning empty caps");
return gst_caps_new_empty ();
} else {
G_GNUC_UNUSED gchar *str;
gst_caps_do_simplify (ret);
str = gst_caps_to_string (ret);
GST_LOG_OBJECT (this, "get_caps returns %s", str);
g_free (str);
return ret;
}
}
static GstCaps *
gst_alsa_fixate_to_mimetype (const GstCaps * caps, const gchar * mime)
{
GstCaps *try, *result;
try = gst_caps_new_simple (mime, NULL);
result = gst_caps_intersect (try, caps);
gst_caps_free (try);
if (gst_caps_is_empty (result)) {
gst_caps_free (result);
return NULL;
}
if (gst_caps_is_subset (caps, result)) {
/* we didn't reduce caps */
gst_caps_free (result);
return NULL;
}
return result;
}
static GstCaps *
gst_alsa_fixate_field_nearest_int (const GstCaps * caps,
const gchar * field_name, gint target)
{
guint i;
GstCaps *result;
GstCaps *smaller = gst_caps_new_empty ();
GstCaps *equal = gst_caps_new_empty ();
GstCaps *bigger = gst_caps_new_empty ();
/* works like this: we fixate every structure and put them into one of those
* caps depending on what we fixated to. We then return the best caps that is
* not empty in the following order: equal, bigger, smaller
* We also make sure the caps were really reduced.
*/
for (i = 0; i < gst_caps_get_size (caps); i++) {
gint fixated_to;
GstStructure *copy = gst_structure_copy (gst_caps_get_structure (caps, i));
gst_caps_structure_fixate_field_nearest_int (copy, field_name, target);
if (gst_structure_get_int (copy, field_name, &fixated_to)) {
if (fixated_to == target) {
gst_caps_append_structure (equal, copy);
} else if (fixated_to > target) {
gst_caps_append_structure (bigger, copy);
} else {
gst_caps_append_structure (smaller, copy);
}
} else {
/* FIXME: what do we do here? Add to all or throw an error? */
g_return_val_if_reached (NULL);
}
}
if (!gst_caps_is_empty (equal)) {
gst_caps_free (bigger);
gst_caps_free (smaller);
result = equal;
} else {
gst_caps_free (equal);
if (!gst_caps_is_empty (bigger)) {
gst_caps_free (smaller);
result = bigger;
} else {
gst_caps_free (bigger);
if (gst_caps_is_empty (smaller)) {
gst_caps_free (smaller);
return NULL;
}
result = smaller;
}
}
if (gst_caps_is_subset (caps, result)) {
/* we didn't reduce caps */
gst_caps_free (result);
return NULL;
}
return result;
}
GstCaps *
gst_alsa_fixate (GstPad * pad, const GstCaps * caps)
{
GstCaps *result;
const gchar *mime;
if ((result = gst_alsa_fixate_to_mimetype (caps, "audio/x-raw-int")))
return result;
if ((result = gst_alsa_fixate_to_mimetype (caps, "audio/x-raw-float")))
return result;
if ((result = gst_alsa_fixate_to_mimetype (caps, "audio/x-alaw")))
return result;
if ((result = gst_alsa_fixate_to_mimetype (caps, "audio/x-mulaw")))
return result;
/* now we know there's only one mimetype in the caps */
/* FIXME: I should check this to be really sure I didn't mess up somewhere */
if ((result = gst_alsa_fixate_field_nearest_int (caps, "rate", 44100)))
return result;
if ((result = gst_alsa_fixate_field_nearest_int (caps, "channels", 2)))
return result;
mime = gst_structure_get_name (gst_caps_get_structure (caps, 0));
if (g_str_equal (mime, "audio/x-raw-int")) {
if ((result = gst_alsa_fixate_field_nearest_int (caps, "width", 16)))
return result;
if ((result = gst_alsa_fixate_field_nearest_int (caps, "depth", 16)))
return result;
} else if (g_str_equal (mime, "audio/x-raw-float")) {
if ((result = gst_alsa_fixate_field_nearest_int (caps, "width", 32)))
return result;
}
return NULL;
}
/* Negotiates the caps */
GstPadLinkReturn
gst_alsa_link (GstPad * pad, const 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 (this->handle == NULL)
if (!gst_alsa_open_audio (this))
return GST_PAD_LINK_REFUSED;
format = gst_alsa_get_format (gst_caps_get_structure (caps, 0));
if (format == NULL)
return GST_PAD_LINK_REFUSED;
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], 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],
old) == GST_PAD_LINK_REFUSED) {
GST_ELEMENT_ERROR (this, CORE, NEGOTIATION, (NULL),
("could not reset caps to a sane value"));
gst_caps_free (old);
break;
} else {
/* FIXME: unset caps on pads somehow */
}
}
gst_caps_free (old);
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 (this, RESOURCE, SETTINGS, (NULL), (NULL));
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 = 0;
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;
}
} else if (!(GST_FLAG_IS_SET (element, GST_ALSA_RUNNING) ||
gst_alsa_start_audio (this))) {
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));
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_PAUSE, 0);
goto cant_pause;
}
}
} else {
cant_pause:
/* if device doesn't know how to pause, we just stop */
if (GST_FLAG_IS_SET (element, GST_ALSA_RUNNING))
gst_alsa_stop_audio (this);
}
gst_alsa_clock_stop (this->clock);
break;
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;
}
}
if (!gst_alsa_xrun_recovery (this)) {
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;
}
return TRUE;
}
gboolean
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);
/* start new timestamps from the current time */
this->transmitted = gst_alsa_timestamp_to_samples (this,
gst_element_get_time (GST_ELEMENT (this)));
/* 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 (this, RESOURCE, FAILED, (NULL),
("Error restarting audio after xrun"));
return FALSE;
}
return TRUE;
}
/*** 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)
{
snd_pcm_info_t *info;
int ret;
g_assert (this != NULL);
g_assert (this->handle == NULL);
/* If we have no pads, then we're apparently a mixer object,
* and that doesn't need a handle to the actual audio device. */
if (!gst_element_get_pad_list (GST_ELEMENT (this)))
return TRUE;
GST_INFO ("Opening alsa device \"%s\"...", this->device);
ERROR_CHECK (snd_output_buffer_open (&this->out),
"error opening log output: %s");
if ((ret = snd_pcm_open (&this->handle, this->device,
GST_ALSA_GET_CLASS (this)->stream, SND_PCM_NONBLOCK)) < 0) {
/* ALSA inverts standard errno.h error codes */
switch (-ret) {
case EBUSY:
GST_ELEMENT_ERROR (GST_ELEMENT (this), RESOURCE, BUSY,
(_("ALSA device \"%s\" is already in use by another program."),
this->device), (NULL));
break;
case EACCES:
case ETXTBSY:
GST_ELEMENT_ERROR (GST_ELEMENT (this), RESOURCE, OPEN_READ_WRITE,
(_("Could not access ALSA device \"%s\", check its permissions."),
this->device), GST_ERROR_SYSTEM);
break;
case ENXIO:
case ENODEV:
case ENOENT:
GST_ELEMENT_ERROR (GST_ELEMENT (this), RESOURCE, BUSY,
(_("ALSA device \"%s\" does not exist."), this->device), (NULL));
break;
default:
GST_ELEMENT_ERROR (GST_ELEMENT (this), RESOURCE, BUSY,
(_("ALSA device \"%s\" had an error."),
this->device), ("ALSA error %d: %s", ret, snd_strerror (ret)));
break;
}
return FALSE;
}
snd_pcm_info_malloc (&info);
snd_pcm_info (this->handle, info);
this->cardname = g_strdup (snd_pcm_info_get_name (info));
snd_pcm_info_free (info);
GST_FLAG_SET (this, GST_ALSA_OPEN);
return TRUE;
}
void
gst_alsa_sw_params_dump (GstAlsa * this, snd_pcm_sw_params_t * sw_params)
{
snd_pcm_sw_params_dump (sw_params, this->out);
ALSA_DEBUG_FLUSH (this);
}
void
gst_alsa_hw_params_dump (GstAlsa * this, snd_pcm_hw_params_t * hw_params)
{
snd_pcm_hw_params_dump (hw_params, this->out);
ALSA_DEBUG_FLUSH (this);
}
/* 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_uframes_t period_size;
unsigned int period_count;
unsigned int rate;
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (format != NULL, FALSE);
GST_INFO ("Probing format: %s %dHz, %d channels",
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));
gst_alsa_hw_params_dump (this, hw_params);
if (GST_ELEMENT (this)->numpads == 1) {
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_access (this->handle,
hw_params, this->
mmap ? SND_PCM_ACCESS_MMAP_INTERLEAVED :
SND_PCM_ACCESS_RW_INTERLEAVED));
} else {
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_access (this->handle,
hw_params, this->
mmap ? SND_PCM_ACCESS_MMAP_NONINTERLEAVED :
SND_PCM_ACCESS_RW_NONINTERLEAVED));
}
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));
/* FIXME: We should use snd_pcm_hw_params_set_rate instead of
* snd_pcm_hw_params_set_rate_near here. Unfortunately alsa fails in that case
* far more often and seems to handle this quite well. (Example: ENS1371
* driver on alsalib 1.0.5, kernel 2.6.6-mm5). If it sets far too wrong sample
* rates, we need to revert back to snd_pcm_hw_params_set_rate or check the
* rate that was set.
*/
rate = format->rate;
SIMPLE_ERROR_CHECK (snd_pcm_hw_params_set_rate_near (this->handle, hw_params,
&rate, 0));
if (rate != format->rate)
GST_WARNING_OBJECT (this, "set rate (%u) differs from desired rate (%u)",
rate, format->rate);
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;
unsigned int rate;
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (this->handle != NULL, FALSE);
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 (this->format) {
GST_INFO ("Preparing format: %s %dHz, %d channels",
snd_pcm_format_name (this->format->format), this->format->rate,
this->format->channels);
if (GST_ELEMENT (this)->numpads == 1) {
ERROR_CHECK (snd_pcm_hw_params_set_access (this->handle, hw_params, this->
mmap ? SND_PCM_ACCESS_MMAP_INTERLEAVED :
SND_PCM_ACCESS_RW_INTERLEAVED),
"This plugin does not support your harware: %s");
} else {
ERROR_CHECK (snd_pcm_hw_params_set_access (this->handle, hw_params, this->
mmap ? SND_PCM_ACCESS_MMAP_NONINTERLEAVED :
SND_PCM_ACCESS_RW_NONINTERLEAVED),
"This plugin does not support your harware: %s");
}
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);
/* FIXME: We should use snd_pcm_hw_params_set_rate instead of
* snd_pcm_hw_params_set_rate_near here. Unfortunately alsa fails in that case
* far more often and seems to handle this quite well. (Example: ENS1371
* driver on alsalib 1.0.5, kernel 2.6.6-mm5). If it sets far too wrong sample
* rates, we need to revert back to snd_pcm_hw_params_set_rate or check the
* rate that was set.
*/
rate = this->format->rate;
ERROR_CHECK (snd_pcm_hw_params_set_rate_near (this->handle, hw_params,
&rate, 0), "error setting rate (%d): %s", this->format->rate);
if (rate != this->format->rate)
GST_WARNING_OBJECT (this, "set rate (%u) differs from desired rate (%u)",
rate, this->format->rate);
ERROR_CHECK (snd_pcm_hw_params_set_periods_near (this->handle, hw_params,
&this->period_count, 0), "error setting period count 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);
} else {
GST_INFO_OBJECT (this, "Preparing format: (none)");
}
gst_alsa_hw_params_dump (this, hw_params);
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;
if (!this->format) {
GST_LOG_OBJECT (this, "not setting sw params, we're not negotiated yet");
return TRUE;
}
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");
gst_alsa_sw_params_dump (this, sw_params);
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))
GST_WARNING_OBJECT (this,
"setting software parameters failed, we'll trust the defaults");
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:
/* 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:
/* 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)
{
gint err;
/* if there's no pads, we never open. So we don't close either. */
if (!gst_element_get_pad_list (GST_ELEMENT (this)))
return TRUE;
g_return_val_if_fail (this != NULL, FALSE);
g_return_val_if_fail (this->handle != NULL, FALSE);
ALSA_DEBUG_FLUSH (this);
err = snd_output_close (this->out);
if (err != 0)
GST_ERROR_OBJECT (this, "failed to close debugging output: %s",
snd_strerror (err));
ERROR_CHECK (snd_pcm_close (this->handle), "Error closing device: %s");
this->handle = NULL;
if (this->cardname) {
g_free (this->cardname);
this->cardname = NULL;
}
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_PAUSE, 0);
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_RESUME, 0);
GST_ALSA_CAPS_SET (this, GST_ALSA_CAPS_SYNC_START, 0);
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_TIME,
gst_element_get_time (GST_ELEMENT (this)), 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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