kernel/sound/core/oss/pcm_plugin.h

   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 */