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TOMOYO Linux Cross Reference
Linux/sound/core/oss/pcm_plugin.h

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  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 

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