xref: /linux/sound/core/oss/pcm_plugin.h (revision 0d456bad36d42d16022be045c8a53ddbb59ee478)
1 #ifndef __PCM_PLUGIN_H
2 #define __PCM_PLUGIN_H
3 
4 /*
5  *  Digital Audio (Plugin interface) abstract layer
6  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
7  *
8  *
9  *   This program is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU General Public License as published by
11  *   the Free Software Foundation; either version 2 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This program is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *   GNU General Public License for more details.
18  *
19  *   You should have received a copy of the GNU General Public License
20  *   along with this program; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
22  *
23  */
24 
25 #ifdef CONFIG_SND_PCM_OSS_PLUGINS
26 
27 #define snd_pcm_plug_stream(plug) ((plug)->stream)
28 
29 enum snd_pcm_plugin_action {
30 	INIT = 0,
31 	PREPARE = 1,
32 };
33 
34 struct snd_pcm_channel_area {
35 	void *addr;			/* base address of channel samples */
36 	unsigned int first;		/* offset to first sample in bits */
37 	unsigned int step;		/* samples distance in bits */
38 };
39 
40 struct snd_pcm_plugin_channel {
41 	void *aptr;			/* pointer to the allocated area */
42 	struct snd_pcm_channel_area area;
43 	snd_pcm_uframes_t frames;	/* allocated frames */
44 	unsigned int enabled:1;		/* channel need to be processed */
45 	unsigned int wanted:1;		/* channel is wanted */
46 };
47 
48 struct snd_pcm_plugin_format {
49 	snd_pcm_format_t format;
50 	unsigned int rate;
51 	unsigned int channels;
52 };
53 
54 struct snd_pcm_plugin {
55 	const char *name;		/* plug-in name */
56 	int stream;
57 	struct snd_pcm_plugin_format src_format;	/* source format */
58 	struct snd_pcm_plugin_format dst_format;	/* destination format */
59 	int src_width;			/* sample width in bits */
60 	int dst_width;			/* sample width in bits */
61 	snd_pcm_access_t access;
62 	snd_pcm_sframes_t (*src_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t dst_frames);
63 	snd_pcm_sframes_t (*dst_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t src_frames);
64 	snd_pcm_sframes_t (*client_channels)(struct snd_pcm_plugin *plugin,
65 					     snd_pcm_uframes_t frames,
66 					     struct snd_pcm_plugin_channel **channels);
67 	snd_pcm_sframes_t (*transfer)(struct snd_pcm_plugin *plugin,
68 				      const struct snd_pcm_plugin_channel *src_channels,
69 				      struct snd_pcm_plugin_channel *dst_channels,
70 				      snd_pcm_uframes_t frames);
71 	int (*action)(struct snd_pcm_plugin *plugin,
72 		      enum snd_pcm_plugin_action action,
73 		      unsigned long data);
74 	struct snd_pcm_plugin *prev;
75 	struct snd_pcm_plugin *next;
76 	struct snd_pcm_substream *plug;
77 	void *private_data;
78 	void (*private_free)(struct snd_pcm_plugin *plugin);
79 	char *buf;
80 	snd_pcm_uframes_t buf_frames;
81 	struct snd_pcm_plugin_channel *buf_channels;
82 	char extra_data[0];
83 };
84 
85 int snd_pcm_plugin_build(struct snd_pcm_substream *handle,
86                          const char *name,
87                          struct snd_pcm_plugin_format *src_format,
88                          struct snd_pcm_plugin_format *dst_format,
89                          size_t extra,
90                          struct snd_pcm_plugin **ret);
91 int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin);
92 int snd_pcm_plugin_clear(struct snd_pcm_plugin **first);
93 int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames);
94 snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size);
95 snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size);
96 
97 #define FULL ROUTE_PLUGIN_RESOLUTION
98 #define HALF ROUTE_PLUGIN_RESOLUTION / 2
99 
100 int snd_pcm_plugin_build_io(struct snd_pcm_substream *handle,
101 			    struct snd_pcm_hw_params *params,
102 			    struct snd_pcm_plugin **r_plugin);
103 int snd_pcm_plugin_build_linear(struct snd_pcm_substream *handle,
104 				struct snd_pcm_plugin_format *src_format,
105 				struct snd_pcm_plugin_format *dst_format,
106 				struct snd_pcm_plugin **r_plugin);
107 int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *handle,
108 			       struct snd_pcm_plugin_format *src_format,
109 			       struct snd_pcm_plugin_format *dst_format,
110 			       struct snd_pcm_plugin **r_plugin);
111 int snd_pcm_plugin_build_rate(struct snd_pcm_substream *handle,
112 			      struct snd_pcm_plugin_format *src_format,
113 			      struct snd_pcm_plugin_format *dst_format,
114 			      struct snd_pcm_plugin **r_plugin);
115 int snd_pcm_plugin_build_route(struct snd_pcm_substream *handle,
116 			       struct snd_pcm_plugin_format *src_format,
117 			       struct snd_pcm_plugin_format *dst_format,
118 		               struct snd_pcm_plugin **r_plugin);
119 int snd_pcm_plugin_build_copy(struct snd_pcm_substream *handle,
120 			      struct snd_pcm_plugin_format *src_format,
121 			      struct snd_pcm_plugin_format *dst_format,
122 			      struct snd_pcm_plugin **r_plugin);
123 
124 int snd_pcm_plug_format_plugins(struct snd_pcm_substream *substream,
125 				struct snd_pcm_hw_params *params,
126 				struct snd_pcm_hw_params *slave_params);
127 
128 snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
129 					   struct snd_mask *format_mask);
130 
131 int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin);
132 
133 snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *handle,
134 					      struct snd_pcm_plugin_channel *src_channels,
135 					      snd_pcm_uframes_t size);
136 snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *handle,
137 					     struct snd_pcm_plugin_channel *dst_channels_final,
138 					     snd_pcm_uframes_t size);
139 
140 snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *handle,
141 						   char *buf, snd_pcm_uframes_t count,
142 						   struct snd_pcm_plugin_channel **channels);
143 
144 snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
145 						 snd_pcm_uframes_t frames,
146 						 struct snd_pcm_plugin_channel **channels);
147 
148 int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_channel,
149 			 size_t dst_offset,
150 			 size_t samples, snd_pcm_format_t format);
151 int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_channel,
152 		      size_t src_offset,
153 		      const struct snd_pcm_channel_area *dst_channel,
154 		      size_t dst_offset,
155 		      size_t samples, snd_pcm_format_t format);
156 
157 void *snd_pcm_plug_buf_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t size);
158 void snd_pcm_plug_buf_unlock(struct snd_pcm_substream *plug, void *ptr);
159 snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream,
160 				     const char *ptr, snd_pcm_uframes_t size,
161 				     int in_kernel);
162 snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream,
163 				    char *ptr, snd_pcm_uframes_t size, int in_kernel);
164 snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream,
165 				      void **bufs, snd_pcm_uframes_t frames,
166 				      int in_kernel);
167 snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream,
168 				     void **bufs, snd_pcm_uframes_t frames,
169 				     int in_kernel);
170 
171 #else
172 
173 static inline snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size) { return drv_size; }
174 static inline snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size) { return clt_size; }
175 static inline int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask) { return format; }
176 
177 #endif
178 
179 #ifdef PLUGIN_DEBUG
180 #define pdprintf(fmt, args...) printk(KERN_DEBUG "plugin: " fmt, ##args)
181 #else
182 #define pdprintf(fmt, args...)
183 #endif
184 
185 #endif				/* __PCM_PLUGIN_H */
186