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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Takashi Iwai0534ab42006-01-13 12:09:12 +01002 * Route Plug-In
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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#include <linux/slab.h>
24#include <linux/time.h>
25#include <sound/core.h>
26#include <sound/pcm.h>
27#include "pcm_plugin.h"
28
Takashi Iwai0534ab42006-01-13 12:09:12 +010029static void zero_areas(struct snd_pcm_plugin_channel *dvp, int ndsts,
30 snd_pcm_uframes_t frames, int format)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
Takashi Iwai0534ab42006-01-13 12:09:12 +010032 int dst = 0;
33 for (; dst < ndsts; ++dst) {
34 if (dvp->wanted)
35 snd_pcm_area_silence(&dvp->area, 0, frames, format);
36 dvp->enabled = 0;
37 dvp++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 }
39}
40
Takashi Iwai0534ab42006-01-13 12:09:12 +010041static inline void copy_area(const struct snd_pcm_plugin_channel *src_channel,
Takashi Iwai6ac77bc2005-11-17 14:01:49 +010042 struct snd_pcm_plugin_channel *dst_channel,
Takashi Iwai0534ab42006-01-13 12:09:12 +010043 snd_pcm_uframes_t frames, int format)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 dst_channel->enabled = 1;
Takashi Iwai0534ab42006-01-13 12:09:12 +010046 snd_pcm_area_copy(&src_channel->area, 0, &dst_channel->area, 0, frames, format);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047}
48
Takashi Iwai6ac77bc2005-11-17 14:01:49 +010049static snd_pcm_sframes_t route_transfer(struct snd_pcm_plugin *plugin,
Takashi Iwai0534ab42006-01-13 12:09:12 +010050 const struct snd_pcm_plugin_channel *src_channels,
51 struct snd_pcm_plugin_channel *dst_channels,
52 snd_pcm_uframes_t frames)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Takashi Iwai0534ab42006-01-13 12:09:12 +010054 int nsrcs, ndsts, dst;
Takashi Iwai6ac77bc2005-11-17 14:01:49 +010055 struct snd_pcm_plugin_channel *dvp;
Takashi Iwai0534ab42006-01-13 12:09:12 +010056 int format;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58 snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO);
59 if (frames == 0)
60 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Takashi Iwai0534ab42006-01-13 12:09:12 +010062 nsrcs = plugin->src_format.channels;
63 ndsts = plugin->dst_format.channels;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Takashi Iwai0534ab42006-01-13 12:09:12 +010065 format = plugin->dst_format.format;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 dvp = dst_channels;
Takashi Iwai0534ab42006-01-13 12:09:12 +010067 if (nsrcs <= 1) {
68 /* expand to all channels */
69 for (dst = 0; dst < ndsts; ++dst) {
70 copy_area(src_channels, dvp, frames, format);
71 dvp++;
72 }
73 return frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Takashi Iwai0534ab42006-01-13 12:09:12 +010076 for (dst = 0; dst < ndsts && dst < nsrcs; ++dst) {
77 copy_area(src_channels, dvp, frames, format);
78 dvp++;
79 src_channels++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 }
Takashi Iwai0534ab42006-01-13 12:09:12 +010081 if (dst < ndsts)
82 zero_areas(dvp, ndsts - dst, frames, format);
83 return frames;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
Takashi Iwai6ac77bc2005-11-17 14:01:49 +010086int snd_pcm_plugin_build_route(struct snd_pcm_substream *plug,
87 struct snd_pcm_plugin_format *src_format,
88 struct snd_pcm_plugin_format *dst_format,
Takashi Iwai6ac77bc2005-11-17 14:01:49 +010089 struct snd_pcm_plugin **r_plugin)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
Takashi Iwai6ac77bc2005-11-17 14:01:49 +010091 struct snd_pcm_plugin *plugin;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 int err;
93
94 snd_assert(r_plugin != NULL, return -ENXIO);
95 *r_plugin = NULL;
96 snd_assert(src_format->rate == dst_format->rate, return -ENXIO);
Takashi Iwai0534ab42006-01-13 12:09:12 +010097 snd_assert(src_format->format == dst_format->format, return -ENXIO);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Takashi Iwai0534ab42006-01-13 12:09:12 +010099 err = snd_pcm_plugin_build(plug, "route conversion",
100 src_format, dst_format, 0, &plugin);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (err < 0)
102 return err;
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 plugin->transfer = route_transfer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 *r_plugin = plugin;
106 return 0;
107}