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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@suse.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
 *
 */

#ifndef ATTRIBUTE_UNUSED
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#endif

typedef unsigned int bitset_t;

static inline size_t bitset_size(int nbits)
{
      return (nbits + sizeof(bitset_t) * 8 - 1) / (sizeof(bitset_t) * 8);
}

static inline bitset_t *bitset_alloc(int nbits)
{
      return kcalloc(bitset_size(nbits), sizeof(bitset_t), GFP_KERNEL);
}
      
static inline void bitset_set(bitset_t *bitmap, unsigned int pos)
{
      size_t bits = sizeof(*bitmap) * 8;
      bitmap[pos / bits] |= 1 << (pos % bits);
}

static inline void bitset_reset(bitset_t *bitmap, unsigned int pos)
{
      size_t bits = sizeof(*bitmap) * 8;
      bitmap[pos / bits] &= ~(1 << (pos % bits));
}

static inline int bitset_get(bitset_t *bitmap, unsigned int pos)
{
      size_t bits = sizeof(*bitmap) * 8;
      return !!(bitmap[pos / bits] & (1 << (pos % bits)));
}

static inline void bitset_copy(bitset_t *dst, bitset_t *src, unsigned int nbits)
{
      memcpy(dst, src, bitset_size(nbits) * sizeof(bitset_t));
}

static inline void bitset_and(bitset_t *dst, bitset_t *bs, unsigned int nbits)
{
      bitset_t *end = dst + bitset_size(nbits);
      while (dst < end)
            *dst++ &= *bs++;
}

static inline void bitset_or(bitset_t *dst, bitset_t *bs, unsigned int nbits)
{
      bitset_t *end = dst + bitset_size(nbits);
      while (dst < end)
            *dst++ |= *bs++;
}

static inline void bitset_zero(bitset_t *dst, unsigned int nbits)
{
      bitset_t *end = dst + bitset_size(nbits);
      while (dst < end)
            *dst++ = 0;
}

static inline void bitset_one(bitset_t *dst, unsigned int nbits)
{
      bitset_t *end = dst + bitset_size(nbits);
      while (dst < end)
            *dst++ = ~(bitset_t)0;
}

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

typedef enum {
      INIT = 0,
      PREPARE = 1,
} snd_pcm_plugin_action_t;

typedef 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 */
} snd_pcm_channel_area_t;

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

typedef struct _snd_pcm_plugin_format {
      int format;
      unsigned int rate;
      unsigned int channels;
} snd_pcm_plugin_format_t;

struct _snd_pcm_plugin {
      const char *name;       /* plug-in name */
      int stream;
      snd_pcm_plugin_format_t src_format; /* source format */
      snd_pcm_plugin_format_t 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)(snd_pcm_plugin_t *plugin, snd_pcm_uframes_t dst_frames);
      snd_pcm_sframes_t (*dst_frames)(snd_pcm_plugin_t *plugin, snd_pcm_uframes_t src_frames);
      snd_pcm_sframes_t (*client_channels)(snd_pcm_plugin_t *plugin,
                         snd_pcm_uframes_t frames,
                         snd_pcm_plugin_channel_t **channels);
      int (*src_channels_mask)(snd_pcm_plugin_t *plugin,
                         bitset_t *dst_vmask,
                         bitset_t **src_vmask);
      int (*dst_channels_mask)(snd_pcm_plugin_t *plugin,
                         bitset_t *src_vmask,
                         bitset_t **dst_vmask);
      snd_pcm_sframes_t (*transfer)(snd_pcm_plugin_t *plugin,
                      const snd_pcm_plugin_channel_t *src_channels,
                      snd_pcm_plugin_channel_t *dst_channels,
                      snd_pcm_uframes_t frames);
      int (*action)(snd_pcm_plugin_t *plugin,
                  snd_pcm_plugin_action_t action,
                  unsigned long data);
      snd_pcm_plugin_t *prev;
      snd_pcm_plugin_t *next;
      snd_pcm_plug_t *plug;
      void *private_data;
      void (*private_free)(snd_pcm_plugin_t *plugin);
      char *buf;
      snd_pcm_uframes_t buf_frames;
      snd_pcm_plugin_channel_t *buf_channels;
      bitset_t *src_vmask;
      bitset_t *dst_vmask;
      char extra_data[0];
};

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

#define FULL ROUTE_PLUGIN_RESOLUTION
#define HALF ROUTE_PLUGIN_RESOLUTION / 2
typedef int route_ttable_entry_t;

int snd_pcm_plugin_build_io(snd_pcm_plug_t *handle,
                      snd_pcm_hw_params_t *params,
                      snd_pcm_plugin_t **r_plugin);
int snd_pcm_plugin_build_linear(snd_pcm_plug_t *handle,
                        snd_pcm_plugin_format_t *src_format,
                        snd_pcm_plugin_format_t *dst_format,
                        snd_pcm_plugin_t **r_plugin);
int snd_pcm_plugin_build_mulaw(snd_pcm_plug_t *handle,
                         snd_pcm_plugin_format_t *src_format,
                         snd_pcm_plugin_format_t *dst_format,
                         snd_pcm_plugin_t **r_plugin);
int snd_pcm_plugin_build_rate(snd_pcm_plug_t *handle,
                        snd_pcm_plugin_format_t *src_format,
                        snd_pcm_plugin_format_t *dst_format,
                        snd_pcm_plugin_t **r_plugin);
int snd_pcm_plugin_build_route(snd_pcm_plug_t *handle,
                         snd_pcm_plugin_format_t *src_format,
                         snd_pcm_plugin_format_t *dst_format,
                         route_ttable_entry_t *ttable,
                           snd_pcm_plugin_t **r_plugin);
int snd_pcm_plugin_build_copy(snd_pcm_plug_t *handle,
                        snd_pcm_plugin_format_t *src_format,
                        snd_pcm_plugin_format_t *dst_format,
                        snd_pcm_plugin_t **r_plugin);

int snd_pcm_plug_format_plugins(snd_pcm_plug_t *substream,
                        snd_pcm_hw_params_t *params,
                        snd_pcm_hw_params_t *slave_params);

int snd_pcm_plug_slave_format(int format, snd_mask_t *format_mask);

int snd_pcm_plugin_append(snd_pcm_plugin_t *plugin);

snd_pcm_sframes_t snd_pcm_plug_write_transfer(snd_pcm_plug_t *handle, snd_pcm_plugin_channel_t *src_channels, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_plug_read_transfer(snd_pcm_plug_t *handle, snd_pcm_plugin_channel_t *dst_channels_final, snd_pcm_uframes_t size);

snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(snd_pcm_plug_t *handle,
                               char *buf, snd_pcm_uframes_t count,
                               snd_pcm_plugin_channel_t **channels);

snd_pcm_sframes_t snd_pcm_plugin_client_channels(snd_pcm_plugin_t *plugin,
                               snd_pcm_uframes_t frames,
                               snd_pcm_plugin_channel_t **channels);

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

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



#define ROUTE_PLUGIN_RESOLUTION 16

int getput_index(int format);
int copy_index(int format);
int conv_index(int src_format, int dst_format);

void zero_channel(snd_pcm_plugin_t *plugin,
              const snd_pcm_plugin_channel_t *dst_channel,
              size_t samples);

#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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