1/*
2 *  PCM I/O Plug-In Interface
3 *  Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
4 *
5 *
6 *   This library is free software; you can redistribute it and/or modify
7 *   it under the terms of the GNU Library General Public License as
8 *   published by the Free Software Foundation; either version 2 of
9 *   the License, or (at your option) any later version.
10 *
11 *   This program is distributed in the hope that it will be useful,
12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *   GNU Library General Public License for more details.
15 *
16 *   You should have received a copy of the GNU Library General Public
17 *   License along with this library; if not, write to the Free Software
18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19 *
20 */
21
22#include <sound/driver.h>
23
24#ifdef CONFIG_SND_PCM_OSS_PLUGINS
25
26#include <linux/time.h>
27#include <sound/core.h>
28#include <sound/pcm.h>
29#include <sound/pcm_params.h>
30#include "pcm_plugin.h"
31
32#define pcm_write(plug,buf,count) snd_pcm_oss_write3(plug,buf,count,1)
33#define pcm_writev(plug,vec,count) snd_pcm_oss_writev3(plug,vec,count,1)
34#define pcm_read(plug,buf,count) snd_pcm_oss_read3(plug,buf,count,1)
35#define pcm_readv(plug,vec,count) snd_pcm_oss_readv3(plug,vec,count,1)
36
37/*
38 *  Basic io plugin
39 */
40
41static snd_pcm_sframes_t io_playback_transfer(struct snd_pcm_plugin *plugin,
42				    const struct snd_pcm_plugin_channel *src_channels,
43				    struct snd_pcm_plugin_channel *dst_channels,
44				    snd_pcm_uframes_t frames)
45{
46	snd_assert(plugin != NULL, return -ENXIO);
47	snd_assert(src_channels != NULL, return -ENXIO);
48	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
49		return pcm_write(plugin->plug, src_channels->area.addr, frames);
50	} else {
51		int channel, channels = plugin->dst_format.channels;
52		void **bufs = (void**)plugin->extra_data;
53		snd_assert(bufs != NULL, return -ENXIO);
54		for (channel = 0; channel < channels; channel++) {
55			if (src_channels[channel].enabled)
56				bufs[channel] = src_channels[channel].area.addr;
57			else
58				bufs[channel] = NULL;
59		}
60		return pcm_writev(plugin->plug, bufs, frames);
61	}
62}
63
64static snd_pcm_sframes_t io_capture_transfer(struct snd_pcm_plugin *plugin,
65				   const struct snd_pcm_plugin_channel *src_channels,
66				   struct snd_pcm_plugin_channel *dst_channels,
67				   snd_pcm_uframes_t frames)
68{
69	snd_assert(plugin != NULL, return -ENXIO);
70	snd_assert(dst_channels != NULL, return -ENXIO);
71	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
72		return pcm_read(plugin->plug, dst_channels->area.addr, frames);
73	} else {
74		int channel, channels = plugin->dst_format.channels;
75		void **bufs = (void**)plugin->extra_data;
76		snd_assert(bufs != NULL, return -ENXIO);
77		for (channel = 0; channel < channels; channel++) {
78			if (dst_channels[channel].enabled)
79				bufs[channel] = dst_channels[channel].area.addr;
80			else
81				bufs[channel] = NULL;
82		}
83		return pcm_readv(plugin->plug, bufs, frames);
84	}
85	return 0;
86}
87
88static snd_pcm_sframes_t io_src_channels(struct snd_pcm_plugin *plugin,
89			     snd_pcm_uframes_t frames,
90			     struct snd_pcm_plugin_channel **channels)
91{
92	int err;
93	unsigned int channel;
94	struct snd_pcm_plugin_channel *v;
95	err = snd_pcm_plugin_client_channels(plugin, frames, &v);
96	if (err < 0)
97		return err;
98	*channels = v;
99	if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
100		for (channel = 0; channel < plugin->src_format.channels; ++channel, ++v)
101			v->wanted = 1;
102	}
103	return frames;
104}
105
106int snd_pcm_plugin_build_io(struct snd_pcm_substream *plug,
107			    struct snd_pcm_hw_params *params,
108			    struct snd_pcm_plugin **r_plugin)
109{
110	int err;
111	struct snd_pcm_plugin_format format;
112	struct snd_pcm_plugin *plugin;
113
114	snd_assert(r_plugin != NULL, return -ENXIO);
115	*r_plugin = NULL;
116	snd_assert(plug != NULL && params != NULL, return -ENXIO);
117	format.format = params_format(params);
118	format.rate = params_rate(params);
119	format.channels = params_channels(params);
120	err = snd_pcm_plugin_build(plug, "I/O io",
121				   &format, &format,
122				   sizeof(void *) * format.channels,
123				   &plugin);
124	if (err < 0)
125		return err;
126	plugin->access = params_access(params);
127	if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
128		plugin->transfer = io_playback_transfer;
129		if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED)
130			plugin->client_channels = io_src_channels;
131	} else {
132		plugin->transfer = io_capture_transfer;
133	}
134
135	*r_plugin = plugin;
136	return 0;
137}
138
139#endif
140