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splitting ALSA code into separate source files

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Original commit message from CVS:
splitting ALSA code into separate source files
This commit is contained in:
Leif Johnson 2003-11-16 00:40:01 +00:00
parent cf2a874521
commit f3b328da39
11 changed files with 1508 additions and 1272 deletions
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7
ext/alsa/Makefile.am
View file

@ -1,11 +1,14 @@
plugin_LTLIBRARIES = libgstalsa.la
libgstalsa_la_SOURCES = gstalsa.c
libgstalsa_la_SOURCES = gstalsaplugin.c \
gstalsa.c gstalsaclock.c gstalsasink.c gstalsasrc.c
libgstalsa_la_CFLAGS = $(GST_CFLAGS) $(ALSA_CFLAGS)
libgstalsa_la_LIBADD = $(ALSA_LIBS)
libgstalsa_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
noinst_HEADERS = gstalsa.h
noinst_HEADERS = \
gstalsa.h gstalsaclock.h gstalsasink.h gstalsasrc.h
EXTRA_DIST = README

10
ext/alsa/gstalsa.1
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@ -6,9 +6,13 @@ pipeline ! \fBalsasink\fR
\fBalsasrc\fR ! pipeline
.SH "DESCRIPTION"
.LP
\fIgstalsa\fP is a plugin to be used with the \fIGStreamer\fP media framework. It consists of elements which can either be used to recieve sound (\fBalsasrc\fR) aquired through alsa or probably the most common use; to output sound generated by a GStreamer pipeline to the ALSA sound architecture(\fBalsasink\fR).
.LP
\fIgstalsa\fP is a plugin to be used with the \fIGStreamer\fP media framework.
The plugin contains several elements that can be used in to interface with an
ALSA sound device. \fIgstalsa\fP contains an element to recieve sound
(\fBalsasrc\fR) aquired through ALSA. Probably the most common use, however, is
to output sound generated by a GStreamer pipeline to an ALSA device
(\fBalsasink\fR).
.SH "SEE ALSO"
.BR gstoss (1),

1218
ext/alsa/gstalsa.c
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File diff suppressed because it is too large Load diff

186
ext/alsa/gstalsa.h
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@ -28,14 +28,61 @@
#include <alsa/asoundlib.h>
#include <gst/gst.h>
#define GST_ALSA_MAX_CHANNELS 64 /* we don't support more than 64 channels */
#define GST_ALSA_MIN_RATE 8000
#define GST_ALSA_MAX_RATE 192000
/* max allowed discontinuity in time units between timestamp and playback pointer
before killing/inserting samples
should be big enough to allow smoothing errors on different video formats */
GST_DEBUG_CATEGORY_STATIC (alsa_debug);
#define GST_CAT_DEFAULT alsa_debug
/* error checking for standard alsa functions */
#define SIMPLE_ERROR_CHECK(value) G_STMT_START{ \
int err = (value); if (err < 0) { return FALSE; } \
}G_STMT_END
#ifdef G_HAVE_ISO_VARARGS
#define ERROR_CHECK(value, ...) G_STMT_START{ \
int err = (value); \
if (err < 0) { \
g_warning ( __VA_ARGS__, snd_strerror (err)); \
return FALSE; \
} \
}G_STMT_END
#elif defined(G_HAVE_GNUC_VARARGS)
#define ERROR_CHECK(value, args...) G_STMT_START{ \
int err = (value); \
if (err < 0) { \
g_warning ( ## args, snd_strerror (err)); \
return FALSE; \
} \
}G_STMT_END
#else
#define ERROR_CHECK(value, args...) G_STMT_START{ \
int err = (value); \
if (err < 0) { \
g_warning (snd_strerror (err)); \
return FALSE; \
} \
}G_STMT_END
#endif
#define GST_ALSA_MIN_RATE 8000
#define GST_ALSA_MAX_RATE 192000
#define GST_ALSA_MAX_TRACKS 64 /* we don't support more than 64 tracks */
#define GST_ALSA_MAX_CHANNELS 32 /* tracks can have up to 32 channels */
/* Mono is 1 channel ; the 5.1 standard is 6 channels. The value for
GST_ALSA_MAX_CHANNELS comes from alsa/mixer.h. */
/* Max allowed discontinuity in time units between timestamp and playback
pointer before killing/inserting samples. This should be big enough to allow
smoothing errors on different video formats. */
#define GST_ALSA_DEFAULT_DISCONT (GST_SECOND / 10)
G_BEGIN_DECLS
#define GST_ALSA(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA, GstAlsa))
#define GST_ALSA_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA, GstAlsaClass))
#define GST_ALSA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ALSA, GstAlsaClass))
@ -43,73 +90,42 @@
#define GST_IS_ALSA_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA))
#define GST_TYPE_ALSA (gst_alsa_get_type())
#define GST_ALSA_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA_SINK, GstAlsaSink))
#define GST_ALSA_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SINK, GstAlsaSinkClass))
#define GST_IS_ALSA_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA_SINK))
#define GST_IS_ALSA_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA_SINK))
#define GST_TYPE_ALSA_SINK (gst_alsa_sink_get_type())
#define GST_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA_SRC, GstAlsaSrc))
#define GST_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SRC, GstAlsaSrcClass))
#define GST_IS_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA_SRC))
#define GST_IS_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA_SRC))
#define GST_TYPE_ALSA_SRC (gst_alsa_src_get_type())
#define GST_ALSA_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALSA_CLOCK,GstAlsaClock))
#define GST_ALSA_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALSA_CLOCK,GstAlsaClockClass))
#define GST_IS_ALSA_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALSA_CLOCK))
#define GST_IS_ALSA_CLOCK_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALSA_CLOCK))
#define GST_TYPE_ALSA_CLOCK (gst_alsa_clock_get_type())
/* I would have preferred to avoid this variety of trickery, but without it i
* can't tell whether I'm a source or a sink upon creation. */
typedef struct _GstAlsa GstAlsa;
typedef struct _GstAlsaClass GstAlsaClass;
typedef struct _GstAlsaSink GstAlsaSink;
typedef struct _GstAlsaSinkClass GstAlsaSinkClass;
typedef struct _GstAlsaSrc GstAlsaSrc;
typedef struct _GstAlsaSrcClass GstAlsaSrcClass;
typedef struct _GstAlsaClock GstAlsaClock;
typedef struct _GstAlsaClockClass GstAlsaClockClass;
typedef GstClockTime (*GstAlsaClockGetTimeFunc) (GstAlsa *owner);
enum {
GST_ALSA_OPEN = GST_ELEMENT_FLAG_LAST,
GST_ALSA_RUNNING,
GST_ALSA_CAPS_NEGO,
GST_ALSA_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 3,
};
typedef enum {
GST_ALSA_CAPS_PAUSE = 0,
GST_ALSA_CAPS_RESUME,
GST_ALSA_CAPS_SYNC_START
/* add more */
} GstAlsaPcmCaps;
#define GST_ALSA_CAPS_IS_SET(obj, flag) (GST_ALSA (obj)->pcm_caps & (1<<(flag)))
#define GST_ALSA_CAPS_SET(obj, flag, set) G_STMT_START{ \
if (set) { \
(GST_ALSA (obj)->pcm_caps |= (1<<(flag))); \
} else { \
(GST_ALSA (obj)->pcm_caps &= ~(1<<(flag))); \
} \
#define GST_ALSA_CAPS_IS_SET(obj, flag) (GST_ALSA (obj)->pcm_caps & (1<<(flag)))
#define GST_ALSA_CAPS_SET(obj, flag, set) G_STMT_START{ \
if (set) { (GST_ALSA (obj)->pcm_caps |= (1<<(flag))); } \
else { (GST_ALSA (obj)->pcm_caps &= ~(1<<(flag))); } \
}G_STMT_END
typedef struct _GstAlsa GstAlsa;
typedef struct _GstAlsaClass GstAlsaClass;
typedef int (*GstAlsaTransmitFunction) (GstAlsa *this, snd_pcm_sframes_t *avail);
typedef struct {
snd_pcm_format_t format;
guint rate;
gint channels;
gint channels;
} GstAlsaFormat;
struct _GstAlsa {
GstElement parent;
/* array of GstAlsaPads */
GstPad * pad[GST_ALSA_MAX_CHANNELS];
GstPad * pad[GST_ALSA_MAX_TRACKS];
gchar * device;
snd_pcm_t * handle;
@ -127,7 +143,7 @@ struct _GstAlsa {
gboolean autorecover;
/* clocking */
GstAlsaClock * clock; /* our provided clock */
GstSystemClock * clock; /* our provided clock */
snd_pcm_uframes_t transmitted; /* samples transmitted since last sync
This thing actually is our master clock.
We will event insert silent samples or
@ -136,7 +152,11 @@ struct _GstAlsa {
GstClockTime max_discont; /* max difference between current
playback timestamp and buffers timestamps
*/
/* mixer */
GList *tracklist; /* list of available tracks */
snd_mixer_t * mixer_handle;
};
struct _GstAlsaClass {
GstElementClass parent_class;
@ -146,48 +166,38 @@ struct _GstAlsaClass {
GstAlsaTransmitFunction transmit_mmap;
GstAlsaTransmitFunction transmit_rw;
};
struct _GstAlsaSink {
GstAlsa parent;
/* array of the data on the channels */
guint8 * data[GST_ALSA_MAX_CHANNELS]; /* pointer into buffer */
guint size[GST_ALSA_MAX_CHANNELS]; /* sink: bytes left in buffer */
GstBuffer * buf[GST_ALSA_MAX_CHANNELS]; /* current buffer */
guint behaviour[GST_ALSA_MAX_CHANNELS]; /* 0 = data points into buffer (so unref when size == 0),
1 = data should be freed, use buffer after that */
};
struct _GstAlsaSinkClass {
GstAlsaClass parent_class;
};
struct _GstAlsaSrc {
GstAlsa parent;
GstBuffer * buf[GST_ALSA_MAX_CHANNELS];
GstBufferPool * pool;
};
struct _GstAlsaSrcClass {
GstAlsaClass parent_class;
};
GType gst_alsa_get_type (void);
struct _GstAlsaClock {
GstSystemClock parent;
void gst_alsa_set_eos (GstAlsa * this);
GstPadLinkReturn gst_alsa_link (GstPad * pad,
GstCaps * caps);
GstCaps * gst_alsa_get_caps (GstPad * pad,
GstCaps *caps);
GstCaps * gst_alsa_caps (snd_pcm_format_t format,
gint rate,
gint channels);
GstAlsaClockGetTimeFunc get_time;
GstAlsa * owner;
/* audio processing functions */
inline snd_pcm_sframes_t gst_alsa_update_avail (GstAlsa * this);
inline gboolean gst_alsa_pcm_wait (GstAlsa * this);
inline gboolean gst_alsa_start (GstAlsa * this);
void gst_alsa_xrun_recovery (GstAlsa * this);
GstClockTimeDiff adjust; /* adjustment to real clock (recalculated when stopping) */
GstClockTime start_time; /* time when the stream started (NONE when stopped) */
/* format conversions */
inline snd_pcm_uframes_t gst_alsa_timestamp_to_samples (GstAlsa * this,
GstClockTime time);
inline GstClockTime gst_alsa_samples_to_timestamp (GstAlsa * this,
snd_pcm_uframes_t samples);
inline snd_pcm_uframes_t gst_alsa_bytes_to_samples (GstAlsa * this,
guint bytes);
inline guint gst_alsa_samples_to_bytes (GstAlsa * this,
snd_pcm_uframes_t samples);
inline GstClockTime gst_alsa_bytes_to_timestamp (GstAlsa * this,
guint bytes);
inline guint gst_alsa_timestamp_to_bytes (GstAlsa * this,
GstClockTime time);
GstClockTime last_unlock; /* time of last unlock request */
};
G_END_DECLS
struct _GstAlsaClockClass {
GstSystemClockClass parent_class;
};
GType gst_alsa_get_type (void);
GType gst_alsa_sink_get_type (void);
GType gst_alsa_src_get_type (void);
GType gst_alsa_clock_get_type (void);
#endif /* __ALSA_H__ */
#endif /* __GST_ALSA_H__ */

199
ext/alsa/gstalsaclock.c Normal file
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@ -0,0 +1,199 @@
/*
* 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 "gstalsaclock.h"
/* clock functions */
static void gst_alsa_clock_class_init (gpointer g_class,
gpointer class_data);
static void gst_alsa_clock_init (GstAlsaClock * clock);
static GstClockTime gst_alsa_clock_get_internal_time (GstClock * clock);
static guint64 gst_alsa_clock_get_resolution (GstClock * clock);
static GstClockEntryStatus gst_alsa_clock_wait (GstClock * clock,
GstClockEntry * entry);
static void gst_alsa_clock_unlock (GstClock * clock,
GstClockEntry * entry);
static GstClockClass * clock_parent_class = NULL;
/* static guint gst_alsa_clock_signals[LAST_SIGNAL] = { 0 }; */
GType
gst_alsa_clock_get_type (void)
{
static GType clock_type = 0;
if (!clock_type) {
static const GTypeInfo clock_info = {
sizeof (GstAlsaClockClass),
NULL,
NULL,
gst_alsa_clock_class_init,
NULL,
NULL,
sizeof (GstAlsaClock),
4,
(GInstanceInitFunc) gst_alsa_clock_init,
NULL
};
clock_type = g_type_register_static (GST_TYPE_CLOCK, "GstAlsaClock",
&clock_info, 0);
}
return clock_type;
}
static void
gst_alsa_clock_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *gobject_class;
GstObjectClass *gstobject_class;
GstClockClass *gstclock_class;
GstAlsaClockClass *klass;
klass = (GstAlsaClockClass *) g_class;
gobject_class = (GObjectClass*) klass;
gstobject_class = (GstObjectClass*) klass;
gstclock_class = (GstClockClass*) klass;
clock_parent_class = g_type_class_ref (GST_TYPE_CLOCK);
gstclock_class->get_internal_time = gst_alsa_clock_get_internal_time;
gstclock_class->get_resolution = gst_alsa_clock_get_resolution;
gstclock_class->wait = gst_alsa_clock_wait;
gstclock_class->unlock = gst_alsa_clock_unlock;
}
static void
gst_alsa_clock_init (GstAlsaClock *clock)
{
gst_object_set_name (GST_OBJECT (clock), "GstAlsaClock");
clock->start_time = GST_CLOCK_TIME_NONE;
}
GstAlsaClock*
gst_alsa_clock_new (gchar *name, GstAlsaClockGetTimeFunc get_time, GstAlsa *owner)
{
GstAlsaClock *alsa_clock = GST_ALSA_CLOCK (g_object_new (GST_TYPE_ALSA_CLOCK, NULL));
g_assert (alsa_clock);
alsa_clock->get_time = get_time;
alsa_clock->owner = owner;
alsa_clock->adjust = 0;
gst_object_set_name (GST_OBJECT (alsa_clock), name);
gst_object_set_parent (GST_OBJECT (alsa_clock), GST_OBJECT (owner));
return alsa_clock;
}
void
gst_alsa_clock_start (GstAlsaClock *clock)
{
GTimeVal timeval;
g_get_current_time (&timeval);
g_assert (!GST_CLOCK_TIME_IS_VALID (clock->start_time));
if (clock->owner->format) {
clock->start_time = GST_TIMEVAL_TO_TIME (timeval) + clock->adjust - clock->get_time (clock->owner);
} else {
clock->start_time = GST_TIMEVAL_TO_TIME (timeval) + clock->adjust;
}
}
void
gst_alsa_clock_stop (GstAlsaClock *clock)
{
GTimeVal timeval;
g_get_current_time (&timeval);
g_assert (GST_CLOCK_TIME_IS_VALID (clock->start_time));
clock->adjust += GST_TIMEVAL_TO_TIME (timeval) - clock->start_time - clock->get_time (clock->owner);
clock->start_time = GST_CLOCK_TIME_NONE;
}
static GstClockTime
gst_alsa_clock_get_internal_time (GstClock *clock)
{
GstAlsaClock *alsa_clock = GST_ALSA_CLOCK (clock);
if (GST_CLOCK_TIME_IS_VALID (alsa_clock->start_time)) {
return alsa_clock->get_time (alsa_clock->owner) + alsa_clock->start_time;
} else {
GTimeVal timeval;
g_get_current_time (&timeval);
return GST_TIMEVAL_TO_TIME (timeval) + alsa_clock->adjust;
}
}
static guint64
gst_alsa_clock_get_resolution (GstClock *clock)
{
GstAlsaClock *this = GST_ALSA_CLOCK (clock);
if (this->owner->format) {
return GST_SECOND / this->owner->format->rate;
} else {
/* FIXME: is there an "unknown" value? We just return the sysclock's time by default */
return 1 * GST_USECOND;
}
}
static GstClockEntryStatus
gst_alsa_clock_wait (GstClock *clock, GstClockEntry *entry)
{
GstClockTime target, entry_time;
GstClockTimeDiff diff;
GstAlsaClock *this = GST_ALSA_CLOCK (clock);
entry_time = gst_alsa_clock_get_internal_time (clock);
diff = GST_CLOCK_ENTRY_TIME (entry) - gst_clock_get_time (clock);
if (diff < 0)
return GST_CLOCK_ENTRY_EARLY;
if (diff > clock->max_diff) {
GST_INFO_OBJECT (this, "GstAlsaClock: abnormal clock request diff: %" G_GINT64_FORMAT") >"
" %"G_GINT64_FORMAT, diff, clock->max_diff);
return GST_CLOCK_ENTRY_EARLY;
}
target = entry_time + diff;
GST_DEBUG_OBJECT (this, "real_target %" G_GUINT64_FORMAT
" target %" G_GUINT64_FORMAT
" now %" G_GUINT64_FORMAT,
target, GST_CLOCK_ENTRY_TIME (entry), entry_time);
while (gst_alsa_clock_get_internal_time (clock) < target &&
this->last_unlock < entry_time) {
g_usleep (gst_alsa_clock_get_resolution (clock) * G_USEC_PER_SEC / GST_SECOND);
}
return entry->status;
}
static void
gst_alsa_clock_unlock (GstClock *clock, GstClockEntry *entry)
{
GstAlsaClock *this = GST_ALSA_CLOCK (clock);
this->last_unlock = this->get_time (this->owner);
}

65
ext/alsa/gstalsaclock.h Normal file
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@ -0,0 +1,65 @@
/*
* 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.
*/
#ifndef __GST_ALSA_CLOCK_H__
#define __GST_ALSA_CLOCK_H__
#include "gstalsa.h"
G_BEGIN_DECLS
#define GST_ALSA_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALSA_CLOCK,GstAlsaClock))
#define GST_ALSA_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALSA_CLOCK,GstAlsaClockClass))
#define GST_IS_ALSA_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALSA_CLOCK))
#define GST_IS_ALSA_CLOCK_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALSA_CLOCK))
#define GST_TYPE_ALSA_CLOCK (gst_alsa_clock_get_type())
typedef struct _GstAlsaClock GstAlsaClock;
typedef struct _GstAlsaClockClass GstAlsaClockClass;
typedef GstClockTime (*GstAlsaClockGetTimeFunc) (GstAlsa *);
struct _GstAlsaClock {
GstSystemClock parent;
GstAlsaClockGetTimeFunc get_time;
GstAlsa * owner;
GstClockTimeDiff adjust; /* adjustment to real clock (recalculated when stopping) */
GstClockTime start_time; /* time when the stream started (NONE when stopped) */
GstClockTime last_unlock; /* time of last unlock request */
};
struct _GstAlsaClockClass {
GstSystemClockClass parent_class;
};
GType gst_alsa_clock_get_type (void);
GstAlsaClock * gst_alsa_clock_new (gchar * name,
GstAlsaClockGetTimeFunc func,
GstAlsa * owner);
void gst_alsa_clock_start (GstAlsaClock * clock);
void gst_alsa_clock_stop (GstAlsaClock * clock);
G_END_DECLS
#endif /* __GST_ALSA_CLOCK_H__ */

54
ext/alsa/gstalsaplugin.c Normal file
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@ -0,0 +1,54 @@
/*
* 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 "gstalsa.h"
#include "gstalsasink.h"
#include "gstalsasrc.h"
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (alsa_debug, "alsa", 0, "alsa plugins");
if (!gst_element_register (plugin, "alsasrc", GST_RANK_NONE, GST_TYPE_ALSA_SRC))
return FALSE;
if (!gst_element_register (plugin, "alsasink", GST_RANK_NONE, GST_TYPE_ALSA_SINK))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"alsa",
"ALSA plugin library",
plugin_init,
VERSION,
"LGPL",
GST_COPYRIGHT,
GST_PACKAGE,
GST_ORIGIN
)

500
ext/alsa/gstalsasink.c Normal file
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@ -0,0 +1,500 @@
/*
* 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 "gstalsasink.h"
#include "gstalsaclock.h"
/* elementfactory information */
static GstElementDetails gst_alsa_sink_details = GST_ELEMENT_DETAILS (
"Alsa Sink",
"Sink/Audio",
"Output to a sound card via ALSA",
"Thomas Nyberg <thomas@codefactory.se>, "
"Andy Wingo <apwingo@eos.ncsu.edu>, "
"Benjamin Otte <in7y118@public.uni-hamburg.de>"
);
static GstPadTemplate * gst_alsa_sink_pad_factory (void);
static GstPadTemplate * gst_alsa_sink_request_pad_factory(void);
static void gst_alsa_sink_base_init (gpointer g_class);
static void gst_alsa_sink_class_init (gpointer g_klass,
gpointer class_data);
static void gst_alsa_sink_init (GstAlsaSink * this);
static inline void gst_alsa_sink_flush_one_pad (GstAlsaSink * sink,
gint i);
static void gst_alsa_sink_flush_pads (GstAlsaSink * sink);
static int gst_alsa_sink_mmap (GstAlsa * this,
snd_pcm_sframes_t * avail);
static int gst_alsa_sink_write (GstAlsa * this,
snd_pcm_sframes_t * avail);
static void gst_alsa_sink_loop (GstElement * element);
static gboolean gst_alsa_sink_check_event (GstAlsaSink * sink,
gint pad_nr);
static GstElementStateReturn gst_alsa_sink_change_state (GstElement * element);
static GstClockTime gst_alsa_sink_get_time (GstAlsa * this);
static GstAlsa *sink_parent_class = NULL;
static GstPadTemplate *
gst_alsa_sink_pad_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template)
template = gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_alsa_caps (SND_PCM_FORMAT_UNKNOWN, -1, -1),
NULL);
return template;
}
static GstPadTemplate *
gst_alsa_sink_request_pad_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template)
template =
gst_pad_template_new ("sink%d", GST_PAD_SINK, GST_PAD_REQUEST,
gst_alsa_caps (SND_PCM_FORMAT_UNKNOWN, -1, 1),
NULL);
return template;
}
GType
gst_alsa_sink_get_type (void)
{
static GType alsa_sink_type = 0;
if (!alsa_sink_type) {
static const GTypeInfo alsa_sink_info = {
sizeof (GstAlsaSinkClass),
gst_alsa_sink_base_init,
NULL,
gst_alsa_sink_class_init,
NULL,
NULL,
sizeof (GstAlsaSink),
0,
(GInstanceInitFunc) gst_alsa_sink_init,
};
alsa_sink_type = g_type_register_static (GST_TYPE_ALSA, "GstAlsaSink", &alsa_sink_info, 0);
}
return alsa_sink_type;
}
static void
gst_alsa_sink_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class, gst_alsa_sink_pad_factory ());
gst_element_class_add_pad_template (element_class, gst_alsa_sink_request_pad_factory ());
gst_element_class_set_details (element_class, &gst_alsa_sink_details);
}
static void
gst_alsa_sink_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *object_class;
GstElementClass *element_class;
GstAlsaClass *alsa_class;
GstAlsaSinkClass *klass;
klass = (GstAlsaSinkClass *) g_class;
object_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
alsa_class = (GstAlsaClass *) klass;
if (sink_parent_class == NULL)
sink_parent_class = g_type_class_ref (GST_TYPE_ALSA);
alsa_class->stream = SND_PCM_STREAM_PLAYBACK;
alsa_class->transmit_mmap = gst_alsa_sink_mmap;
alsa_class->transmit_rw = gst_alsa_sink_write;
element_class->change_state = gst_alsa_sink_change_state;
}
static void
gst_alsa_sink_init (GstAlsaSink *sink)
{
GstAlsa *this = GST_ALSA (sink);
this->pad[0] = gst_pad_new_from_template (gst_alsa_sink_pad_factory (), "sink");
gst_pad_set_link_function (this->pad[0], gst_alsa_link);
gst_pad_set_getcaps_function (this->pad[0], gst_alsa_get_caps);
gst_element_add_pad (GST_ELEMENT (this), this->pad[0]);
this->clock = GST_SYSTEM_CLOCK (gst_alsa_clock_new ("alsasinkclock", gst_alsa_sink_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_element_set_loop_function (GST_ELEMENT (this), gst_alsa_sink_loop);
}
static inline void
gst_alsa_sink_flush_one_pad (GstAlsaSink *sink, gint i)
{
switch (sink->behaviour[i]) {
case 0:
if (sink->buf[i])
gst_data_unref (GST_DATA (sink->buf[i]));
sink->buf[i] = NULL;
sink->data[i] = NULL;
sink->behaviour[i] = 0;
sink->size[i] = 0;
break;
case 1:
g_free (sink->data[i]);
sink->data[i] = NULL;
sink->behaviour[i] = 0;
sink->size[i] = 0;
break;
default:
g_assert_not_reached ();
}
}
static void
gst_alsa_sink_flush_pads (GstAlsaSink *sink)
{
gint i;
for (i = 0; i < GST_ELEMENT (sink)->numpads; i++) {
/* flush twice to unref buffer when behaviour == 1 */
gst_alsa_sink_flush_one_pad (sink, i);
gst_alsa_sink_flush_one_pad (sink, i);
}
}
/* TRUE, if everything should continue */
static gboolean
gst_alsa_sink_check_event (GstAlsaSink *sink, gint pad_nr)
{
gboolean cont = TRUE;
GstEvent *event = GST_EVENT (sink->buf[pad_nr]);
GstAlsa *this = GST_ALSA (sink);
if (event) {
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
gst_alsa_set_eos (this);
cont = FALSE;
break;
case GST_EVENT_INTERRUPT:
cont = FALSE;
break;
case GST_EVENT_DISCONTINUOUS:
{
gint64 value;
/* only the first pad my seek */
if (pad_nr != 0) {
break;
}
if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &value)) {
if (!gst_clock_handle_discont (GST_ELEMENT (this)->clock, value))
GST_WARNING_OBJECT (this, "clock couldn't handle discontinuity");
}
if (gst_event_discont_get_value (event, GST_FORMAT_DEFAULT, &value)) {
/* don't change the value ; it's in samples already */
} else if (gst_event_discont_get_value (event, GST_FORMAT_BYTES, &value)) {
if (this->format) value = gst_alsa_bytes_to_samples (this, value);
} else if (gst_event_discont_get_value (event, GST_FORMAT_TIME, &value)) {
if (this->format) value = gst_alsa_timestamp_to_samples (this, value);
} else {
GST_WARNING_OBJECT (this, "could not acquire samplecount after seek, the clock might screw your pipeline now");
break;
}
/* if the clock is running */
if (GST_CLOCK_TIME_IS_VALID (GST_ALSA_CLOCK (this->clock)->start_time)) {
g_assert (this->format);
/* adjust the start time */
GST_ALSA_CLOCK (this->clock)->start_time +=
gst_alsa_samples_to_timestamp (this, this->transmitted) -
gst_alsa_samples_to_timestamp (this, value);
}
this->transmitted = value;
break;
}
default:
GST_INFO_OBJECT (this, "got an unknown event (Type: %d)", GST_EVENT_TYPE (event));
break;
}
gst_event_unref (event);
sink->buf[pad_nr] = NULL;
} else {
/* the element at the top of the chain did not emit an event. */
g_assert_not_reached ();
}
return cont;
}
static int
gst_alsa_sink_mmap (GstAlsa *this, snd_pcm_sframes_t *avail)
{
snd_pcm_uframes_t offset;
const snd_pcm_channel_area_t *dst;
snd_pcm_channel_area_t *src;
GstAlsaSink *sink = GST_ALSA_SINK (this);
int i, err, width = snd_pcm_format_physical_width (this->format->format);
/* areas points to the memory areas that belong to gstreamer. */
src = g_malloc0 (this->format->channels * sizeof(snd_pcm_channel_area_t));
if (((GstElement *) this)->numpads == 1) {
/* interleaved */
for (i = 0; i < this->format->channels; i++) {
src[i].addr = sink->data[0];
src[i].first = i * width;
src[i].step = this->format->channels * width;
}
} else {
/* noninterleaved */
for (i = 0; i < this->format->channels; i++) {
src[i].addr = sink->data[i];
src[i].first = 0;
src[i].step = width;
}
}
if ((err = snd_pcm_mmap_begin (this->handle, &dst, &offset, avail)) < 0) {
GST_ERROR_OBJECT (this, "mmap failed: %s", snd_strerror (err));
return -1;
}
if ((err = snd_pcm_areas_copy (dst, offset, src, 0, this->format->channels, *avail, this->format->format)) < 0) {
snd_pcm_mmap_commit (this->handle, offset, 0);
GST_ERROR_OBJECT (this, "data copy failed: %s", snd_strerror (err));
return -1;
}
if ((err = snd_pcm_mmap_commit (this->handle, offset, *avail)) < 0) {
GST_ERROR_OBJECT (this, "mmap commit failed: %s", snd_strerror (err));
return -1;
}
return err;
}
static int
gst_alsa_sink_write (GstAlsa *this, snd_pcm_sframes_t *avail)
{
GstAlsaSink *sink = GST_ALSA_SINK (this);
void *channels[this->format->channels];
int err, i;
if (((GstElement *) this)->numpads == 1) {
/* interleaved */
err = snd_pcm_writei (this->handle, sink->data[0], *avail);
} else {
/* noninterleaved */
for (i = 0; i < this->format->channels; i++) {
channels[i] = sink->data[i];
}
err = snd_pcm_writen (this->handle, channels, *avail);
}
/* error handling */
if (err < 0) {
if (err == -EPIPE) {
gst_alsa_xrun_recovery (this);
return 0;
}
GST_ERROR_OBJECT (this, "error on data access: %s", snd_strerror (err));
}
return err;
}
static void
gst_alsa_sink_loop (GstElement *element)
{
snd_pcm_sframes_t avail, avail2, copied, sample_diff, max_discont;
snd_pcm_uframes_t samplestamp;
gint i;
guint bytes; /* per channel */
GstAlsa *this = GST_ALSA (element);
GstAlsaSink *sink = GST_ALSA_SINK (element);
g_return_if_fail (sink != NULL);
sink_restart:
avail = gst_alsa_update_avail (this);
if (avail == -EPIPE) goto sink_restart;
if (avail < 0) return;
if (avail > 0) {
/* Not enough space. We grab data nonetheless and sleep afterwards */
if (avail < this->period_size) {
avail = this->period_size;
}
/* check how many bytes we still have in all our bytestreams */
/* initialize this value to a somewhat sane state, we might alloc this much data below (which would be a bug, but who knows)... */
bytes = this->period_size * this->period_count * element->numpads * 8; /* must be > max sample size in bytes */
for (i = 0; i < element->numpads; i++) {
g_assert (this->pad[i] != NULL);
while (sink->size[i] == 0) {
if (!sink->buf[i])
sink->buf[i] = GST_BUFFER (gst_pad_pull (this->pad[i]));
if (GST_IS_EVENT (sink->buf[i])) {
if (gst_alsa_sink_check_event (sink, i))
continue;
return;
}
/* caps nego failed somewhere */
if (this->format == NULL) {
gst_element_error (GST_ELEMENT (this), "alsasink: No caps available");
return;
}
samplestamp = gst_alsa_timestamp_to_samples (this, GST_BUFFER_TIMESTAMP (sink->buf[i]));
max_discont = gst_alsa_timestamp_to_samples (this, this->max_discont);
sample_diff = samplestamp - this->transmitted;
if ((!GST_BUFFER_TIMESTAMP_IS_VALID (sink->buf[i])) ||
(-max_discont <= sample_diff && sample_diff <= max_discont)) {
/* difference between expected and current is < GST_ALSA_DEVIATION */
no_difference:
sink->size[i] = sink->buf[i]->size;
sink->data[i] = sink->buf[i]->data;
sink->behaviour[i] = 0;
} else if (sample_diff > 0) {
/* there are empty samples in front of us, fill them with silence */
int samples = MIN (bytes, sample_diff) *
(element->numpads == 1 ? this->format->channels : 1);
int size = samples * snd_pcm_format_physical_width (this->format->format) / 8;
g_printerr ("Allocating %d bytes (%ld samples) now to resync: sample %ld expected, but got %ld\n",
size, MIN (bytes, sample_diff), this->transmitted, samplestamp);
sink->data[i] = g_try_malloc (size);
if (!sink->data[i]) {
GST_WARNING_OBJECT (this, "error allocating %d bytes, buffers unsynced now.", size);
goto no_difference;
}
sink->size[i] = size;
if (0 != snd_pcm_format_set_silence (this->format->format, sink->data[i], samples)) {
GST_WARNING_OBJECT (this, "error silencing buffer, enjoy the noise.");
}
sink->behaviour[i] = 1;
} else if (gst_alsa_samples_to_bytes (this, -sample_diff) >= sink->buf[i]->size) {
GST_INFO_OBJECT (this, "Skipping %lu samples to resync (complete buffer): sample %ld expected, but got %ld\n",
gst_alsa_bytes_to_samples (this, sink->buf[i]->size), this->transmitted, samplestamp);
/* this buffer is way behind */
gst_buffer_unref (sink->buf[i]);
sink->buf[i] = NULL;
continue;
} else if (sample_diff < 0) {
gint difference = gst_alsa_samples_to_bytes (this, -samplestamp);
GST_INFO_OBJECT (this, "Skipping %lu samples to resync: sample %ld expected, but got %ld\n",
(gulong) -sample_diff, this->transmitted, samplestamp);
/* this buffer is only a bit behind */
sink->size[i] = sink->buf[i]->size - difference;
sink->data[i] = sink->buf[i]->data + difference;
sink->behaviour[i] = 0;
} else {
g_assert_not_reached ();
}
}
bytes = MIN (bytes, sink->size[i]);
}
avail = MIN (avail, gst_alsa_bytes_to_samples (this, bytes));
/* wait until the hw buffer has enough space */
while (gst_element_get_state (element) == GST_STATE_PLAYING && (avail2 = gst_alsa_update_avail (this)) < avail) {
if (avail2 <= -EPIPE) goto sink_restart;
if (avail2 < 0) return;
if (avail2 < avail && snd_pcm_state(this->handle) != SND_PCM_STATE_RUNNING)
if (!gst_alsa_start (this)) return;
if (gst_alsa_pcm_wait (this) == FALSE)
return;
}
/* FIXME: lotsa stuff can have happened while fetching data. Do we need to check something? */
/* put this data into alsa */
if ((copied = this->transmit (this, &avail)) < 0)
return;
/* update our clock */
this->transmitted += copied;
/* flush the data */
bytes = gst_alsa_samples_to_bytes (this, copied);
for (i = 0; i < element->numpads; i++) {
if ((sink->size[i] -= bytes) == 0) {
gst_alsa_sink_flush_one_pad (sink, i);
continue;
}
g_assert (sink->size[i] > 0);
if (sink->behaviour[i] != 1)
sink->data[i] += bytes;
}
}
if (snd_pcm_state(this->handle) != SND_PCM_STATE_RUNNING && snd_pcm_avail_update (this->handle) == 0) {
gst_alsa_start (this);
}
}
static GstElementStateReturn
gst_alsa_sink_change_state (GstElement *element)
{
GstAlsaSink *sink;
g_return_val_if_fail (element != NULL, FALSE);
sink = GST_ALSA_SINK (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
case GST_STATE_READY_TO_PAUSED:
case GST_STATE_PAUSED_TO_PLAYING:
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_alsa_sink_flush_pads (sink);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
g_assert_not_reached();
}
if (GST_ELEMENT_CLASS (sink_parent_class)->change_state)
return GST_ELEMENT_CLASS (sink_parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static GstClockTime
gst_alsa_sink_get_time (GstAlsa *this)
{
snd_pcm_sframes_t delay;
if (snd_pcm_delay (this->handle, &delay) == 0) {
return GST_SECOND * (GstClockTime) (this->transmitted > delay ? this->transmitted - delay : 0) / this->format->rate;
} else {
return 0;
}
}

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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.
*/
#ifndef __GST_ALSA_SINK_H__
#define __GST_ALSA_SINK_H__
#include "gstalsa.h"
G_BEGIN_DECLS
#define GST_ALSA_SINK(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA_SINK, GstAlsaSink))
#define GST_ALSA_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SINK, GstAlsaSinkClass))
#define GST_IS_ALSA_SINK(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA_SINK))
#define GST_IS_ALSA_SINK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA_SINK))
#define GST_TYPE_ALSA_SINK (gst_alsa_sink_get_type())
typedef struct _GstAlsaSink GstAlsaSink;
typedef struct _GstAlsaSinkClass GstAlsaSinkClass;
struct _GstAlsaSink {
GstAlsa parent;
/* array of the data on the channels */
guint8 *data[GST_ALSA_MAX_TRACKS]; /* pointer into buffer */
guint size[GST_ALSA_MAX_TRACKS]; /* sink: bytes left in buffer */
GstBuffer *buf[GST_ALSA_MAX_TRACKS]; /* current buffer */
guint behaviour[GST_ALSA_MAX_TRACKS]; /* 0 = data points into buffer (so unref when size == 0),
1 = data should be freed, use buffer after that */
};
struct _GstAlsaSinkClass {
GstAlsaClass parent_class;
};
GType gst_alsa_sink_get_type (void);
gboolean gst_alsa_sink_factory_init (GstPlugin *plugin);
G_END_DECLS
#endif /* __GST_ALSA_SINK_H__ */

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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 "gstalsasrc.h"
#include "gstalsaclock.h"
/* elementfactory information */
static GstElementDetails gst_alsa_src_details = GST_ELEMENT_DETAILS (
"Alsa Src",
"Source/Audio",
"Read from a sound card via ALSA",
"Thomas Nyberg <thomas@codefactory.se>, "
"Andy Wingo <apwingo@eos.ncsu.edu>, "
"Benjamin Otte <in7y118@public.uni-hamburg.de>"
);
static GstPadTemplate * gst_alsa_src_pad_factory (void);
static GstPadTemplate * gst_alsa_src_request_pad_factory (void);
static void gst_alsa_src_base_init (gpointer g_class);
static void gst_alsa_src_class_init (gpointer g_class,
gpointer class_data);
static void gst_alsa_src_init (GstAlsaSrc * this);
static int gst_alsa_src_mmap (GstAlsa * this,
snd_pcm_sframes_t * avail);
static int gst_alsa_src_read (GstAlsa * this,
snd_pcm_sframes_t * avail);
static void gst_alsa_src_loop (GstElement * element);
static void gst_alsa_src_flush (GstAlsaSrc * src);
static GstElementStateReturn gst_alsa_src_change_state (GstElement * element);
static GstClockTime gst_alsa_src_get_time (GstAlsa * this);
static GstAlsa *src_parent_class = NULL;
static GstPadTemplate *
gst_alsa_src_pad_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template)
template = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_alsa_caps (SND_PCM_FORMAT_UNKNOWN, -1, -1),
NULL);
return template;
}
static GstPadTemplate *
gst_alsa_src_request_pad_factory (void)
{
static GstPadTemplate *template = NULL;
if (!template)
template = gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_alsa_caps (SND_PCM_FORMAT_UNKNOWN, -1, 1),
NULL);
return template;
}
GType
gst_alsa_src_get_type (void)
{
static GType alsa_src_type = 0;
if (!alsa_src_type) {
static const GTypeInfo alsa_src_info = {
sizeof (GstAlsaSrcClass),
gst_alsa_src_base_init,
NULL,
gst_alsa_src_class_init,
NULL,
NULL,
sizeof (GstAlsaSrc),
0,
(GInstanceInitFunc) gst_alsa_src_init,
};
alsa_src_type = g_type_register_static (GST_TYPE_ALSA, "GstAlsaSrc", &alsa_src_info, 0);
}
return alsa_src_type;
}
static void
gst_alsa_src_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class, gst_alsa_src_pad_factory ());
gst_element_class_add_pad_template (element_class, gst_alsa_src_request_pad_factory ());
gst_element_class_set_details (element_class, &gst_alsa_src_details);
}
static void
gst_alsa_src_class_init (gpointer g_class, gpointer class_data)
{
GObjectClass *object_class;
GstElementClass *element_class;
GstAlsaClass *alsa_class;
GstAlsaSrcClass *klass;
klass = (GstAlsaSrcClass *) g_class;
object_class = (GObjectClass *) klass;
element_class = (GstElementClass *) klass;
alsa_class = (GstAlsaClass *) klass;
if (src_parent_class == NULL)
src_parent_class = g_type_class_ref (GST_TYPE_ALSA);
alsa_class->stream = SND_PCM_STREAM_CAPTURE;
alsa_class->transmit_mmap = gst_alsa_src_mmap;
alsa_class->transmit_rw = gst_alsa_src_read;
element_class->change_state = gst_alsa_src_change_state;
}
static void
gst_alsa_src_init (GstAlsaSrc *src)
{
GstAlsa *this = GST_ALSA (src);
this->pad[0] = gst_pad_new_from_template (gst_alsa_src_pad_factory (), "src");
gst_pad_set_link_function (this->pad[0], gst_alsa_link);
gst_pad_set_getcaps_function (this->pad[0], gst_alsa_get_caps);
gst_element_add_pad (GST_ELEMENT (this), this->pad[0]);
this->clock = GST_SYSTEM_CLOCK (gst_alsa_clock_new ("alsasrcclock", gst_alsa_src_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_element_set_loop_function (GST_ELEMENT (this), gst_alsa_src_loop);
}
static int
gst_alsa_src_mmap (GstAlsa *this, snd_pcm_sframes_t *avail)
{
snd_pcm_uframes_t offset;
snd_pcm_channel_area_t *dst;
const snd_pcm_channel_area_t *src;
int i, err, width = snd_pcm_format_physical_width (this->format->format);
GstAlsaSrc *alsa_src = GST_ALSA_SRC (this);
/* areas points to the memory areas that belong to gstreamer. */
dst = g_malloc0 (this->format->channels * sizeof(snd_pcm_channel_area_t));
if (((GstElement *) this)->numpads == 1) {
/* interleaved */
for (i = 0; i < this->format->channels; i++) {
dst[i].addr = alsa_src->buf[0]->data;
dst[i].first = i * width;
dst[i].step = this->format->channels * width;
}
} else {
/* noninterleaved */
for (i = 0; i < this->format->channels; i++) {
dst[i].addr = alsa_src->buf[i]->data;
dst[i].first = 0;
dst[i].step = width;
}
}
if ((err = snd_pcm_mmap_begin (this->handle, &src, &offset, avail)) < 0) {
GST_ERROR_OBJECT (this, "mmap failed: %s", snd_strerror (err));
return -1;
}
if (*avail > 0 && (err = snd_pcm_areas_copy (dst, 0, src, offset, this->format->channels, *avail, this->format->format)) < 0) {
snd_pcm_mmap_commit (this->handle, offset, 0);
GST_ERROR_OBJECT (this, "data copy failed: %s", snd_strerror (err));
return -1;
}
if ((err = snd_pcm_mmap_commit (this->handle, offset, *avail)) < 0) {
GST_ERROR_OBJECT (this, "mmap commit failed: %s", snd_strerror (err));
return -1;
}
return err;
}
static int
gst_alsa_src_read (GstAlsa *this, snd_pcm_sframes_t *avail)
{
void *channels[this->format->channels];
int err, i;
GstAlsaSrc *src = GST_ALSA_SRC (this);
if (((GstElement *) this)->numpads == 1) {
/* interleaved */
err = snd_pcm_readi (this->handle, src->buf[0]->data, *avail);
} else {
/* noninterleaved */
for (i = 0; i < this->format->channels; i++) {
channels[i] = src->buf[i]->data;
}
err = snd_pcm_readn (this->handle, channels, *avail);
}
/* error handling */
if (err < 0) {
if (err == -EPIPE) {
gst_alsa_xrun_recovery (this);
return 0;
}
GST_ERROR_OBJECT (this, "error on data access: %s", snd_strerror (err));
}
return err;
}
static inline gint
gst_alsa_src_adjust_rate (gint rate, gboolean aggressive)
{
static gint rates[] = { 96000, 48000, 44100, 22050, 8000 };
gint i;
if (aggressive)
return rate;
for (i = 0; i < G_N_ELEMENTS (rates); i++) {
if (rate >= rates[i])
return rates[i];
}
return 0;
}
static gboolean
gst_alsa_src_set_caps (GstAlsaSrc *src, gboolean aggressive)
{
GstCaps *all_caps, *caps, *walk;
gint channels, min_channels, max_channels;
gint rate, min_rate, max_rate;
gint i, endian, width, depth;
gboolean sign;
GstAlsa *this = GST_ALSA (src);
all_caps = gst_alsa_get_caps (this->pad[0], NULL);
if (all_caps == NULL) return FALSE;
/* now intersect this with all caps of the peers... */
for (i = 0; i < GST_ELEMENT (src)->numpads; i++) {
all_caps = gst_caps_intersect (all_caps, gst_pad_get_caps (this->pad[i]));
if (all_caps == NULL) {
GST_DEBUG ("No compatible caps found in alsasrc (%s)", GST_ELEMENT_NAME (this));
return FALSE;
}
}
/* construct caps */
caps = GST_CAPS_NEW ("alsasrc caps", "audio/x-raw-int",
"endianness", GST_PROPS_INT (G_BYTE_ORDER),
"signed", GST_PROPS_BOOLEAN (TRUE),
"width", GST_PROPS_INT (16),
"depth", GST_PROPS_INT (16),
"rate", GST_PROPS_INT (44100),
"channels", GST_PROPS_INT (1));
gst_caps_ref (caps);
gst_caps_sink (caps);
/* now try to find the best match */
walk = all_caps;
while (walk) {
gst_caps_get (walk, "signed", &sign, "width", &width, "depth", &depth, NULL);
if (gst_caps_has_property (walk, "endianness")) {
gst_caps_get_int (walk, "endianness", &endian);
} else {
endian = G_BYTE_ORDER;
}
gst_caps_set (caps, "endianness", GST_PROPS_INT (endian));
gst_caps_set (caps, "width", GST_PROPS_INT (width));
gst_caps_set (caps, "depth", GST_PROPS_INT (depth));
gst_caps_set (caps, "signed", GST_PROPS_BOOLEAN (sign));
gst_props_entry_get_int_range (gst_props_get_entry (GST_CAPS_PROPERTIES (walk), "rate"), &min_rate, &max_rate);
gst_props_entry_get_int_range (gst_props_get_entry (GST_CAPS_PROPERTIES (walk), "channels"), &min_channels, &max_channels);
for (rate = max_rate;; rate--) {
if ((rate = gst_alsa_src_adjust_rate (rate, aggressive)) < min_rate)
break;
gst_caps_set (caps, "rate", GST_PROPS_INT (rate));
for (channels = aggressive ? max_channels : MIN (max_channels, 2); channels >= min_channels; channels--) {
gst_caps_set (caps, "channels", GST_PROPS_INT (channels));
GST_DEBUG ("trying new caps: %ssigned, endianness: %d, width %d, depth %d, channels %d, rate %d",
sign ? "" : "un", endian, width, depth, channels, rate);
if (gst_pad_try_set_caps (this->pad[0], caps) != GST_PAD_LINK_REFUSED)
gst_alsa_link (this->pad[0], caps);
if (this->format) {
/* try to set caps here */
return TRUE;
}
}
}
walk = GST_CAPS_NEXT (walk);
}
if (!aggressive)
return gst_alsa_src_set_caps (src, TRUE);
return FALSE;
}
/* we transmit buffers of period_size frames */
static void
gst_alsa_src_loop (GstElement *element)
{
snd_pcm_sframes_t avail, copied;
gint i;
GstAlsa *this = GST_ALSA (element);
GstAlsaSrc *src = GST_ALSA_SRC (element);
/* set the caps on all pads */
if (!this->format) {
if (!gst_alsa_src_set_caps (src, FALSE)) {
gst_element_error (element, "Could not set caps");
return;
}
/* get the bufferpool going */
if (src->pool)
gst_buffer_pool_unref (src->pool);
src->pool = gst_buffer_pool_get_default (gst_alsa_samples_to_bytes (this, this->period_size),
2 * element->numpads);
}
while ((avail = gst_alsa_update_avail (this)) < this->period_size) {
if (avail == -EPIPE) continue;
if (avail < 0) return;
if (snd_pcm_state(this->handle) != SND_PCM_STATE_RUNNING) {
if (!gst_alsa_start (this))
return;
continue;
};
/* wait */
if (gst_alsa_pcm_wait (this) == FALSE)
return;
}
g_assert (avail >= this->period_size);
/* make sure every pad has a buffer */
for (i = 0; i < element->numpads; i++) {
if (!src->buf[i]) {
src->buf[i] = gst_buffer_new_from_pool (src->pool, 0, 0);
}
}
/* fill buffer with data */
if ((copied = this->transmit (this, &avail)) <= 0)
return;
/* push the buffers out and let them have fun */
for (i = 0; i < element->numpads; i++) {
if (!src->buf[i])
return;
if (copied != this->period_size)
GST_BUFFER_SIZE (src->buf[i]) = gst_alsa_samples_to_bytes (this, copied);
GST_BUFFER_TIMESTAMP (src->buf[i]) = gst_alsa_samples_to_timestamp (this, this->transmitted);
GST_BUFFER_DURATION (src->buf[i]) = gst_alsa_samples_to_timestamp (this, copied);
gst_pad_push (this->pad[i], GST_DATA (src->buf[i]));
src->buf[i] = NULL;
}
this->transmitted += copied;
}
static void
gst_alsa_src_flush (GstAlsaSrc *src)
{
gint i;
for (i = 0; i < GST_ELEMENT (src)->numpads; i++) {
if (src->buf[i]) {
gst_buffer_unref (src->buf[i]);
src->buf[i] = NULL;
}
}
if (src->pool) {
gst_buffer_pool_unref (src->pool);
src->pool = NULL;
}
}
static GstElementStateReturn
gst_alsa_src_change_state (GstElement *element)
{
GstAlsaSrc *src;
g_return_val_if_fail (element != NULL, FALSE);
src = GST_ALSA_SRC (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_NULL_TO_READY:
case GST_STATE_READY_TO_PAUSED:
case GST_STATE_PAUSED_TO_PLAYING:
case GST_STATE_PLAYING_TO_PAUSED:
break;
case GST_STATE_PAUSED_TO_READY:
gst_alsa_src_flush (src);
break;
case GST_STATE_READY_TO_NULL:
break;
default:
g_assert_not_reached();
}
if (GST_ELEMENT_CLASS (src_parent_class)->change_state)
return GST_ELEMENT_CLASS (src_parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static GstClockTime
gst_alsa_src_get_time (GstAlsa *this)
{
snd_pcm_sframes_t delay;
if (snd_pcm_delay (this->handle, &delay) == 0) {
return GST_SECOND * (this->transmitted + delay) / this->format->rate;
} else {
return 0;
}
}

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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.
*/
#ifndef __GST_ALSA_SRC_H__
#define __GST_ALSA_SRC_H__
#include "gstalsa.h"
G_BEGIN_DECLS
#define GST_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA_SRC, GstAlsaSrc))
#define GST_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SRC, GstAlsaSrcClass))
#define GST_IS_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA_SRC))
#define GST_IS_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA_SRC))
#define GST_TYPE_ALSA_SRC (gst_alsa_src_get_type())
typedef struct _GstAlsaSrc GstAlsaSrc;
typedef struct _GstAlsaSrcClass GstAlsaSrcClass;
struct _GstAlsaSrc {
GstAlsa parent;
GstBuffer *buf[GST_ALSA_MAX_TRACKS];
GstBufferPool *pool;
};
struct _GstAlsaSrcClass {
GstAlsaClass parent_class;
};
GType gst_alsa_src_get_type (void);
gboolean gst_alsa_src_factory_init (GstPlugin *plugin);
G_END_DECLS
#endif /* __GST_ALSA_SRC_H__ */