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pcm_plugin.h

#ifndef __PCM_PLUGIN_H
#define __PCM_PLUGIN_H

/*
 *  Digital Audio (Plugin interface) abstract layer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#ifdef CONFIG_SND_PCM_OSS_PLUGINS

#define snd_pcm_plug_stream(plug) ((plug)->stream)

enum snd_pcm_plugin_action {
      INIT = 0,
      PREPARE = 1,
};

struct snd_pcm_channel_area {
      void *addr;             /* base address of channel samples */
      unsigned int first;           /* offset to first sample in bits */
      unsigned int step;            /* samples distance in bits */
};

struct snd_pcm_plugin_channel {
      void *aptr;             /* pointer to the allocated area */
      struct snd_pcm_channel_area area;
      snd_pcm_uframes_t frames;     /* allocated frames */
      unsigned int enabled:1;       /* channel need to be processed */
      unsigned int wanted:1;        /* channel is wanted */
};

struct snd_pcm_plugin_format {
      int format;
      unsigned int rate;
      unsigned int channels;
};

struct snd_pcm_plugin {
      const char *name;       /* plug-in name */
      int stream;
      struct snd_pcm_plugin_format src_format;  /* source format */
      struct snd_pcm_plugin_format dst_format;  /* destination format */
      int src_width;                /* sample width in bits */
      int dst_width;                /* sample width in bits */
      int access;
      snd_pcm_sframes_t (*src_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t dst_frames);
      snd_pcm_sframes_t (*dst_frames)(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t src_frames);
      snd_pcm_sframes_t (*client_channels)(struct snd_pcm_plugin *plugin,
                                   snd_pcm_uframes_t frames,
                                   struct snd_pcm_plugin_channel **channels);
      snd_pcm_sframes_t (*transfer)(struct snd_pcm_plugin *plugin,
                              const struct snd_pcm_plugin_channel *src_channels,
                              struct snd_pcm_plugin_channel *dst_channels,
                              snd_pcm_uframes_t frames);
      int (*action)(struct snd_pcm_plugin *plugin,
                  enum snd_pcm_plugin_action action,
                  unsigned long data);
      struct snd_pcm_plugin *prev;
      struct snd_pcm_plugin *next;
      struct snd_pcm_substream *plug;
      void *private_data;
      void (*private_free)(struct snd_pcm_plugin *plugin);
      char *buf;
      snd_pcm_uframes_t buf_frames;
      struct snd_pcm_plugin_channel *buf_channels;
      char extra_data[0];
};

int snd_pcm_plugin_build(struct snd_pcm_substream *handle,
                         const char *name,
                         struct snd_pcm_plugin_format *src_format,
                         struct snd_pcm_plugin_format *dst_format,
                         size_t extra,
                         struct snd_pcm_plugin **ret);
int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin);
int snd_pcm_plugin_clear(struct snd_pcm_plugin **first);
int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t drv_size);
snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *handle, snd_pcm_uframes_t clt_size);

#define FULL ROUTE_PLUGIN_RESOLUTION
#define HALF ROUTE_PLUGIN_RESOLUTION / 2

int snd_pcm_plugin_build_io(struct snd_pcm_substream *handle,
                      struct snd_pcm_hw_params *params,
                      struct snd_pcm_plugin **r_plugin);
int snd_pcm_plugin_build_linear(struct snd_pcm_substream *handle,
                        struct snd_pcm_plugin_format *src_format,
                        struct snd_pcm_plugin_format *dst_format,
                        struct snd_pcm_plugin **r_plugin);
int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *handle,
                         struct snd_pcm_plugin_format *src_format,
                         struct snd_pcm_plugin_format *dst_format,
                         struct snd_pcm_plugin **r_plugin);
int snd_pcm_plugin_build_rate(struct snd_pcm_substream *handle,
                        struct snd_pcm_plugin_format *src_format,
                        struct snd_pcm_plugin_format *dst_format,
                        struct snd_pcm_plugin **r_plugin);
int snd_pcm_plugin_build_route(struct snd_pcm_substream *handle,
                         struct snd_pcm_plugin_format *src_format,
                         struct snd_pcm_plugin_format *dst_format,
                           struct snd_pcm_plugin **r_plugin);
int snd_pcm_plugin_build_copy(struct snd_pcm_substream *handle,
                        struct snd_pcm_plugin_format *src_format,
                        struct snd_pcm_plugin_format *dst_format,
                        struct snd_pcm_plugin **r_plugin);

int snd_pcm_plug_format_plugins(struct snd_pcm_substream *substream,
                        struct snd_pcm_hw_params *params,
                        struct snd_pcm_hw_params *slave_params);

int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask);

int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin);

snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *handle,
                                    struct snd_pcm_plugin_channel *src_channels,
                                    snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *handle,
                                   struct snd_pcm_plugin_channel *dst_channels_final,
                                   snd_pcm_uframes_t size);

snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *handle,
                                       char *buf, snd_pcm_uframes_t count,
                                       struct snd_pcm_plugin_channel **channels);

snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
                                     snd_pcm_uframes_t frames,
                                     struct snd_pcm_plugin_channel **channels);

int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_channel,
                   size_t dst_offset,
                   size_t samples, int format);
int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_channel,
                  size_t src_offset,
                  const struct snd_pcm_channel_area *dst_channel,
                  size_t dst_offset,
                  size_t samples, int format);

void *snd_pcm_plug_buf_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t size);
void snd_pcm_plug_buf_unlock(struct snd_pcm_substream *plug, void *ptr);
snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream,
                             const char *ptr, snd_pcm_uframes_t size,
                             int in_kernel);
snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream,
                            char *ptr, snd_pcm_uframes_t size, int in_kernel);
snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream,
                              void **bufs, snd_pcm_uframes_t frames,
                              int in_kernel);
snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream,
                             void **bufs, snd_pcm_uframes_t frames,
                             int in_kernel);

#else

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; }
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; }
static inline int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask) { return format; }

#endif

#ifdef PLUGIN_DEBUG
#define pdprintf( fmt, args... ) printk( "plugin: " fmt, ##args)
#else
#define pdprintf( fmt, args... ) 
#endif

#endif                        /* __PCM_PLUGIN_H */

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