gstreamer/ext/alsa/gstalsa.h

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/*
Copyright (C) 2001 CodeFactory AB
Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
Copyright (C) 2001 Andy Wingo <apwingo@eos.ncsu.edu>
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_H__
#define __GST_ALSA_H__
#include <alsa/asoundlib.h>
#include <gst/gst.h>
#include <gst/bytestream/bytestream.h>
#include <glib.h>
#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_IS_ALSA(obj) G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA)
#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, GstAlsa)
#define GST_ALSA_SINK_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SINK, GstAlsaClass)
#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, GstAlsa)
#define GST_ALSA_SRC_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SRC, GstAlsaClass)
#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_PAD(obj) ((GstAlsaPad*)obj->data) /* obj is a GList */
/* 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 GstAlsa GstAlsaSink;
typedef GstAlsaClass GstAlsaSinkClass;
typedef GstAlsa GstAlsaSrc;
typedef GstAlsaClass GstAlsaSrcClass;
enum {
GST_ALSA_OPEN = GST_ELEMENT_FLAG_LAST,
GST_ALSA_RUNNING,
GST_ALSA_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 3,
};
typedef gboolean (*GstAlsaProcessFunc) (GstAlsa *, snd_pcm_uframes_t frames);
typedef struct {
gint channel;
GstPad *pad;
GstByteStream *bs;
/* pointer to where we can access mmap_areas */
char *access_addr;
char *buf;
/* how much of the buffer we have used */
snd_pcm_uframes_t offset;
} GstAlsaPad;
struct _GstAlsa {
GstElement parent;
/* list of GstAlsaPads */
GList *pads;
gchar *device;
snd_pcm_stream_t stream;
snd_pcm_t *handle;
snd_output_t *out;
/* our mmap'd data areas */
gboolean mmap_open;
const snd_pcm_channel_area_t *mmap_areas;
char **access_addr;
snd_pcm_uframes_t offset;
snd_pcm_sframes_t avail;
GstAlsaProcessFunc process;
snd_pcm_format_t format;
guint rate;
gint channels;
guint32 mute; /* bitmask. */
/* the gstreamer data */
gboolean data_interleaved;
/* access to the hardware */
gboolean access_interleaved;
guint sample_bytes;
guint interleave_unit;
guint interleave_skip;
guint buffer_frames;
guint period_count; /* 'number of fragments' in oss-speak */
guint period_frames;
};
struct _GstAlsaClass {
GstElementClass parent_class;
};
GType gst_alsa_get_type (void);
GType gst_alsa_sink_get_type (void);
GType gst_alsa_src_get_type (void);
#endif /* __ALSA_H__ */