mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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193 lines
6.9 KiB
C
193 lines
6.9 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) 2001-2002 Andy Wingo <apwingo@eos.ncsu.edu>
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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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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*
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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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*
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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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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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#include <alsa/asoundlib.h>
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#include <gst/gst.h>
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#define GST_ALSA_MAX_CHANNELS 64 /* we don't support more than 64 channels */
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#define GST_ALSA_MIN_RATE 8000
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#define GST_ALSA_MAX_RATE 192000
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/* max allowed discontinuity in time units between timestamp and playback pointer
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before killing/inserting samples
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should be big enough to allow smoothing errors on different video formats */
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#define GST_ALSA_DEFAULT_DISCONT (GST_SECOND / 10)
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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_ALSA_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), 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, GstAlsaSink)
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#define GST_ALSA_SINK_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SINK, GstAlsaSinkClass)
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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, GstAlsaSrc)
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#define GST_ALSA_SRC_CLASS(klass) G_TYPE_CHECK_CLASS_CAST(klass, GST_TYPE_ALSA_SRC, GstAlsaSrcClass)
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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_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALSA_CLOCK,GstAlsaClock))
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#define GST_ALSA_CLOCK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALSA_CLOCK,GstAlsaClockClass))
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#define GST_IS_ALSA_CLOCK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALSA_CLOCK))
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#define GST_IS_ALSA_CLOCK_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALSA_CLOCK))
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#define GST_TYPE_ALSA_CLOCK (gst_alsa_clock_get_type())
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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 struct _GstAlsaSink GstAlsaSink;
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typedef struct _GstAlsaSinkClass GstAlsaSinkClass;
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typedef struct _GstAlsaSrc GstAlsaSrc;
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typedef struct _GstAlsaSrcClass GstAlsaSrcClass;
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typedef struct _GstAlsaClock GstAlsaClock;
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typedef struct _GstAlsaClockClass GstAlsaClockClass;
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typedef GstClockTime (*GstAlsaClockGetTimeFunc) (GstAlsa *owner);
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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_CAPS_NEGO,
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GST_ALSA_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 3,
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};
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typedef enum {
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GST_ALSA_CAPS_PAUSE = 0,
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GST_ALSA_CAPS_RESUME,
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GST_ALSA_CAPS_SYNC_START
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/* add more */
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} GstAlsaPcmCaps;
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#define GST_ALSA_CAPS_IS_SET(obj, flag) (GST_ALSA (obj)->pcm_caps & (1<<(flag)))
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#define GST_ALSA_CAPS_SET(obj, flag, set) G_STMT_START{ \
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if (set) { \
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(GST_ALSA (obj)->pcm_caps |= (1<<(flag))); \
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} else { \
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(GST_ALSA (obj)->pcm_caps &= ~(1<<(flag))); \
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} \
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}G_STMT_END
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typedef int (*GstAlsaTransmitFunction) (GstAlsa *this, snd_pcm_sframes_t *avail);
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typedef struct {
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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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} GstAlsaFormat;
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struct _GstAlsa {
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GstElement parent;
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/* array of GstAlsaPads */
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GstPad * pad[GST_ALSA_MAX_CHANNELS];
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gchar * device;
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snd_pcm_t * handle;
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guint pcm_caps; /* capabilities of the pcm device, see GstAlsaPcmCaps */
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snd_output_t * out;
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GstAlsaFormat * format; /* NULL if undefined */
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gboolean mmap; /* use mmap transmit (fast) or read/write (sloooow) */
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GstAlsaTransmitFunction transmit;
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/* latency / performance parameters */
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snd_pcm_uframes_t period_size;
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unsigned int period_count;
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gboolean autorecover;
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/* clocking */
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GstAlsaClock * clock; /* our provided clock */
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snd_pcm_uframes_t transmitted; /* samples transmitted since last sync
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This thing actually is our master clock.
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We will event insert silent samples or
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drop some to sync to incoming timestamps.
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*/
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GstClockTime max_discont; /* max difference between current
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playback timestamp and buffers timestamps
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*/
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};
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struct _GstAlsaClass {
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GstElementClass parent_class;
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snd_pcm_stream_t stream;
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/* different transmit functions */
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GstAlsaTransmitFunction transmit_mmap;
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GstAlsaTransmitFunction transmit_rw;
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};
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struct _GstAlsaSink {
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GstAlsa parent;
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/* array of the data on the channels */
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guint8 * data[GST_ALSA_MAX_CHANNELS]; /* pointer into buffer */
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guint size[GST_ALSA_MAX_CHANNELS]; /* sink: bytes left in buffer */
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GstBuffer * buf[GST_ALSA_MAX_CHANNELS]; /* current buffer */
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guint behaviour[GST_ALSA_MAX_CHANNELS]; /* 0 = data points into buffer (so unref when size == 0),
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1 = data should be freed, use buffer after that */
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};
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struct _GstAlsaSinkClass {
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GstAlsaClass parent_class;
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};
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struct _GstAlsaSrc {
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GstAlsa parent;
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GstBuffer * buf[GST_ALSA_MAX_CHANNELS];
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GstBufferPool * pool;
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};
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struct _GstAlsaSrcClass {
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GstAlsaClass parent_class;
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};
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struct _GstAlsaClock {
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GstSystemClock parent;
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GstAlsaClockGetTimeFunc get_time;
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GstAlsa * owner;
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GstClockTimeDiff adjust; /* adjustment to real clock (recalculated when stopping) */
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GstClockTime start_time; /* time when the stream started (NONE when stopped) */
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GstClockTime last_unlock; /* time of last unlock request */
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};
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struct _GstAlsaClockClass {
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GstSystemClockClass 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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GType gst_alsa_clock_get_type (void);
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#endif /* __ALSA_H__ */
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