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fixing alsa step 2: complete rewrite of data transfer. The whole stuff is clean enough to go from there now.
Original commit message from CVS: fixing alsa step 2: complete rewrite of data transfer. The whole stuff is clean enough to go from there now. License change to LGPL, since no copied code is left now. Missing: - alsasrc - resetting format - corner cases - testsuite
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3 changed files with 430 additions and 651 deletions
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@ -3,7 +3,8 @@
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This plugin was originally written by Thomas Nyberg <thomas@codefactory.se> for
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ALSA 0.5.x. It was updated and changed quite a bit in September 2001 by Andy
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Wingo for use with ALSA 0.9.x.
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Wingo for use with ALSA 0.9.x. It was rewritten in great part again by Benjamin
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Otte in January/February 2003.
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1.0 Introduction
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----------------
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@ -44,21 +45,18 @@ My particular card has 4 channel out and 2 channel in. As you can see, each of
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these devices are stereo. The alsasink and alsasrc elements correspond to the
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default alsa devices.
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3.0 License
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3.0 Where to look for other ALSA drivers
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----------------------------------------
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ALSA 0.9 isn't very well documented, so we had to rely on a number of different
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sources for guidance. Sources of inspiration include JACK's alsa driver
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(available in jack's cvs tree, http://jack.sourceforge.net/), the alsa2 driver
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of mplayer (http://www.mplayerhq.hu) and the pcm.c example from the ALSA library
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itself.
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(http://www.alsa-project.org/alsa-doc/alsa-lib/_2test_2pcm_8c-example.html)
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4.0 License
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-----------
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ALSA 0.9.x isn't very well documented, so I had to rely on a number of different
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sources for guidance. One of the main sources of inspiration was Paul Davis'
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audioengine (available in quasimodo's cvs tree,
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http://quasimodo.sourceforge.net/), from which I took a large amount of code.
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Since that project is licensed under the GPL, it was only right that I license
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the updated version of this plugin under the GPL as well. What, in my
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understanding, this means for the end user is that you cannot use the ALSA
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plugin with a non-GPL program. If in doubt, please refer to the COPYING file
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located in this directory.
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This plugin is licensed under the Lesser General Public License (LGPL). See the
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file COPYING in the top source directory.
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File diff suppressed because it is too large
Load diff
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@ -2,6 +2,7 @@
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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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@ -21,11 +22,16 @@
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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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#include <gst/bytestream/bytestream.h>
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#include <glib.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(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_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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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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/* buf and offset are only used for src elements to hold data from the sound
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card, while we're waiting for an entire period_frames data. */
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char *buf;
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snd_pcm_uframes_t offset;
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guint8 *data;
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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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/* array of GstAlsaPads */
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GstAlsaPad pads[GST_ALSA_MAX_CHANNELS];
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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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/* 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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/* 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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gboolean debug;
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};
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struct _GstAlsaClass {
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