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126 lines
4.1 KiB
C
126 lines
4.1 KiB
C
/*
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Copyright (C) 2001 CodeFactory AB
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Copyright (C) 2001 Thomas Nyberg <thomas@codefactory.se>
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Copyright (C) 2001 Andy Wingo <apwingo@eos.ncsu.edu>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __GST_ALSA_H__
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#define __GST_ALSA_H__
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#include <alsa/asoundlib.h>
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#include <gst/gst.h>
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#include <gst/bytestream/bytestream.h>
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#include <glib.h>
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#define GST_ALSA(obj) G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA, GstAlsa)
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#define GST_ALSA_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA, GstAlsaClass)
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#define GST_IS_ALSA(obj) G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA)
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#define GST_IS_ALSA_CLASS(klass) G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA)
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#define GST_TYPE_ALSA gst_alsa_get_type()
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#define GST_ALSA_SINK(obj) G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA_SINK, GstAlsa)
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#define GST_ALSA_SINK_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SINK, GstAlsaClass)
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#define GST_IS_ALSA_SINK(obj) G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA_SINK)
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#define GST_IS_ALSA_SINK_CLASS(klass) G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA_SINK)
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#define GST_TYPE_ALSA_SINK gst_alsa_sink_get_type()
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#define GST_ALSA_SRC(obj) G_TYPE_CHECK_INSTANCE_CAST(obj, GST_TYPE_ALSA_SRC, GstAlsa)
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#define GST_ALSA_SRC_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SRC, GstAlsaClass)
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#define GST_IS_ALSA_SRC(obj) G_TYPE_CHECK_INSTANCE_TYPE(obj, GST_TYPE_ALSA_SRC)
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#define GST_IS_ALSA_SRC_CLASS(klass) G_TYPE_CHECK_CLASS_TYPE(klass, GST_TYPE_ALSA_SRC)
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#define GST_TYPE_ALSA_SRC gst_alsa_src_get_type()
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#define GST_ALSA_PAD(obj) ((GstAlsaPad*)obj->data) /* obj is a GList */
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/* I would have preferred to avoid this variety of trickery, but without it i
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* can't tell whether I'm a source or a sink upon creation. */
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typedef struct _GstAlsa GstAlsa;
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typedef struct _GstAlsaClass GstAlsaClass;
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typedef GstAlsa GstAlsaSink;
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typedef GstAlsaClass GstAlsaSinkClass;
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typedef GstAlsa GstAlsaSrc;
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typedef GstAlsaClass GstAlsaSrcClass;
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enum {
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GST_ALSA_OPEN = GST_ELEMENT_FLAG_LAST,
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GST_ALSA_RUNNING,
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GST_ALSA_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 3,
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};
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typedef gboolean (*GstAlsaProcessFunc) (GstAlsa *, snd_pcm_uframes_t frames);
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typedef struct {
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gint channel;
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GstPad *pad;
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GstByteStream *bs;
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/* pointer to where we can access mmap_areas */
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char *access_addr;
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char *buf;
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/* how much of the buffer we have used */
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snd_pcm_uframes_t offset;
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} GstAlsaPad;
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struct _GstAlsa {
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GstElement parent;
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/* list of GstAlsaPads */
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GList *pads;
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gchar *device;
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snd_pcm_stream_t stream;
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snd_pcm_t *handle;
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snd_output_t *out;
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/* our mmap'd data areas */
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gboolean mmap_open;
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const snd_pcm_channel_area_t *mmap_areas;
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char **access_addr;
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snd_pcm_uframes_t offset;
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snd_pcm_sframes_t avail;
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GstAlsaProcessFunc process;
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snd_pcm_format_t format;
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guint rate;
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gint channels;
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guint32 mute; /* bitmask. */
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/* the gstreamer data */
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gboolean data_interleaved;
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/* access to the hardware */
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gboolean access_interleaved;
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guint sample_bytes;
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guint interleave_unit;
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guint interleave_skip;
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guint buffer_frames;
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guint period_count; /* 'number of fragments' in oss-speak */
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guint period_frames;
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};
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struct _GstAlsaClass {
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GstElementClass parent_class;
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};
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GType gst_alsa_get_type (void);
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GType gst_alsa_sink_get_type (void);
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GType gst_alsa_src_get_type (void);
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#endif /* __ALSA_H__ */
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