autopm/ramdisk/usr/local/aplay/include/alsa/pcm_ioplug.h

   1 /**
   2  * \file include/pcm_ioplug.h
   3  * \brief External I/O-Plugin SDK
   4  * \author Takashi Iwai <tiwai@suse.de>
   5  * \date 2005
   6  *
   7  * External I/O-Plugin SDK
   8  */
   9
  10 /*
  11  * ALSA external PCM plugin SDK
  12  *
  13  * Copyright (c) 2005 Takashi Iwai <tiwai@suse.de>
  14  *
  15  *   This library is free software; you can redistribute it and/or modify
  16  *   it under the terms of the GNU Lesser General Public License as
  17  *   published by the Free Software Foundation; either version 2.1 of
  18  *   the License, or (at your option) any later version.
  19  *
  20  *   This program is distributed in the hope that it will be useful,
  21  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   GNU Lesser General Public License for more details.
  24  *
  25  *   You should have received a copy of the GNU Lesser General Public
  26  *   License along with this library; if not, write to the Free Software
  27  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  28  *
  29  */
  30
  31 #ifndef __ALSA_PCM_IOPLUG_H
  32 #define __ALSA_PCM_IOPLUG_H
  33
  34 /**
  35  * \defgroup PCM_IOPlug External I/O plugin SDK
  36  * \ingroup Plugin_SDK
  37  * See the \ref pcm page for more details.
  38  * \{
  39  */
  40
  41 /** hw constraints for ioplug */
  42 enum {
  43         SND_PCM_IOPLUG_HW_ACCESS = 0,   /**< access type */
  44         SND_PCM_IOPLUG_HW_FORMAT,       /**< format */
  45         SND_PCM_IOPLUG_HW_CHANNELS,     /**< channels */
  46         SND_PCM_IOPLUG_HW_RATE,         /**< rate */
  47         SND_PCM_IOPLUG_HW_PERIOD_BYTES, /**< period bytes */
  48         SND_PCM_IOPLUG_HW_BUFFER_BYTES, /**< buffer bytes */
  49         SND_PCM_IOPLUG_HW_PERIODS,      /**< number of periods */
  50         SND_PCM_IOPLUG_HW_PARAMS        /**< max number of hw constraints */
  51 };
  52
  53 /** I/O plugin handle */
  54 typedef struct snd_pcm_ioplug snd_pcm_ioplug_t;
  55 /** Callback table of ioplug */
  56 typedef struct snd_pcm_ioplug_callback snd_pcm_ioplug_callback_t;
  57
  58 /*
  59  * bit flags for additional conditions
  60  */
  61 #define SND_PCM_IOPLUG_FLAG_LISTED      (1<<0)          /**< list up this PCM */
  62 #define SND_PCM_IOPLUG_FLAG_MONOTONIC   (1<<1)          /**< monotonic timestamps */
  63
  64 /*
  65  * Protocol version
  66  */
  67 #define SND_PCM_IOPLUG_VERSION_MAJOR    1       /**< Protocol major version */
  68 #define SND_PCM_IOPLUG_VERSION_MINOR    0       /**< Protocol minor version */
  69 #define SND_PCM_IOPLUG_VERSION_TINY     1       /**< Protocol tiny version */
  70 /**
  71  * IO-plugin protocol version
  72  */
  73 #define SND_PCM_IOPLUG_VERSION          ((SND_PCM_IOPLUG_VERSION_MAJOR<<16) |\
  74                                          (SND_PCM_IOPLUG_VERSION_MINOR<<8) |\
  75                                          (SND_PCM_IOPLUG_VERSION_TINY))
  76
  77 /** Handle of ioplug */
  78 struct snd_pcm_ioplug {
  79         /**
  80          * protocol version; #SND_PCM_IOPLUG_VERSION must be filled here
  81          * before calling #snd_pcm_ioplug_create()
  82          */
  83         unsigned int version;
  84         /**
  85          * name of this plugin; must be filled before calling #snd_pcm_ioplug_create()
  86          */
  87         const char *name;
  88         unsigned int flags;     /**< SND_PCM_IOPLUG_FLAG_XXX */
  89         int poll_fd;            /**< poll file descriptor */
  90         unsigned int poll_events;       /**< poll events */
  91         unsigned int mmap_rw;           /**< pseudo mmap mode */
  92         /**
  93          * callbacks of this plugin; must be filled before calling #snd_pcm_ioplug_create()
  94          */
  95         const snd_pcm_ioplug_callback_t *callback;
  96         /**
  97          * private data, which can be used freely in the driver callbacks
  98          */
  99         void *private_data;
 100         /**
 101          * PCM handle filled by #snd_pcm_extplug_create()
 102          */
 103         snd_pcm_t *pcm;
 104
 105         snd_pcm_stream_t stream;        /**< stream direcion; read-only */
 106         snd_pcm_state_t state;          /**< current PCM state; read-only */
 107         volatile snd_pcm_uframes_t appl_ptr;    /**< application pointer; read-only */
 108         volatile snd_pcm_uframes_t hw_ptr;      /**< hw pointer; read-only */
 109         int nonblock;                   /**< non-block mode; read-only */
 110
 111         snd_pcm_access_t access;        /**< access type; filled after hw_params is called */
 112         snd_pcm_format_t format;        /**< PCM format; filled after hw_params is called */
 113         unsigned int channels;          /**< number of channels; filled after hw_params is called */
 114         unsigned int rate;              /**< rate; filled after hw_params is called */
 115         snd_pcm_uframes_t period_size;  /**< period size; filled after hw_params is called */
 116         snd_pcm_uframes_t buffer_size;  /**< buffer size; filled after hw_params is called */
 117 };
 118
 119 /** Callback table of ioplug */
 120 struct snd_pcm_ioplug_callback {
 121         /**
 122          * start the PCM; required
 123          */
 124         int (*start)(snd_pcm_ioplug_t *io);
 125         /**
 126          * stop the PCM; required
 127          */
 128         int (*stop)(snd_pcm_ioplug_t *io);
 129         /**
 130          * get the current DMA position; required
 131          */
 132         snd_pcm_sframes_t (*pointer)(snd_pcm_ioplug_t *io);
 133         /**
 134          * transfer the data; optional
 135          */
 136         snd_pcm_sframes_t (*transfer)(snd_pcm_ioplug_t *io,
 137                                       const snd_pcm_channel_area_t *areas,
 138                                       snd_pcm_uframes_t offset,
 139                                       snd_pcm_uframes_t size);
 140         /**
 141          * close the PCM; optional
 142          */
 143         int (*close)(snd_pcm_ioplug_t *io);
 144         /**
 145          * hw_params; optional
 146          */
 147         int (*hw_params)(snd_pcm_ioplug_t *io, snd_pcm_hw_params_t *params);
 148         /**
 149          * hw_free; optional
 150          */
 151         int (*hw_free)(snd_pcm_ioplug_t *io);
 152         /**
 153          * sw_params; optional
 154          */
 155         int (*sw_params)(snd_pcm_ioplug_t *io, snd_pcm_sw_params_t *params);
 156         /**
 157          * prepare; optional
 158          */
 159         int (*prepare)(snd_pcm_ioplug_t *io);
 160         /**
 161          * drain; optional
 162          */
 163         int (*drain)(snd_pcm_ioplug_t *io);
 164         /**
 165          * toggle pause; optional
 166          */
 167         int (*pause)(snd_pcm_ioplug_t *io, int enable);
 168         /**
 169          * resume; optional
 170          */
 171         int (*resume)(snd_pcm_ioplug_t *io);
 172         /**
 173          * poll descriptors count; optional
 174          */
 175         int (*poll_descriptors_count)(snd_pcm_ioplug_t *io);
 176         /**
 177          * poll descriptors; optional
 178          */
 179         int (*poll_descriptors)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int space);
 180         /**
 181          * mangle poll events; optional
 182          */
 183         int (*poll_revents)(snd_pcm_ioplug_t *io, struct pollfd *pfd, unsigned int nfds, unsigned short *revents);
 184         /**
 185          * dump; optional
 186          */
 187         void (*dump)(snd_pcm_ioplug_t *io, snd_output_t *out);
 188         /**
 189          * get the delay for the running PCM; optional
 190          */
 191         int (*delay)(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp);
 192 };
 193
 194
 195 int snd_pcm_ioplug_create(snd_pcm_ioplug_t *io, const char *name,
 196                           snd_pcm_stream_t stream, int mode);
 197 int snd_pcm_ioplug_delete(snd_pcm_ioplug_t *io);
 198
 199 /* update poll_fd and mmap_rw */
 200 int snd_pcm_ioplug_reinit_status(snd_pcm_ioplug_t *ioplug);
 201
 202 /* get a mmap area (for mmap_rw only) */
 203 const snd_pcm_channel_area_t *snd_pcm_ioplug_mmap_areas(snd_pcm_ioplug_t *ioplug);
 204
 205 /* clear hw_parameter setting */
 206 void snd_pcm_ioplug_params_reset(snd_pcm_ioplug_t *io);
 207
 208 /* hw_parameter setting */
 209 int snd_pcm_ioplug_set_param_minmax(snd_pcm_ioplug_t *io, int type, unsigned int min, unsigned int max);
 210 int snd_pcm_ioplug_set_param_list(snd_pcm_ioplug_t *io, int type, unsigned int num_list, const unsigned int *list);
 211
 212 /* change PCM status */
 213 int snd_pcm_ioplug_set_state(snd_pcm_ioplug_t *ioplug, snd_pcm_state_t state);
 214
 215 /** \} */
 216
 217 #endif /* __ALSA_PCM_IOPLUG_H */