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TOMOYO Linux Cross Reference
Linux/sound/drivers/pcm-indirect2.h

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  1 /*
  2  * Helper functions for indirect PCM data transfer to a simple FIFO in
  3  * hardware (small, no possibility to read "hardware io position",
  4  * updating position done by interrupt, ...)
  5  *
  6  *  Copyright (c) by 2007  Joachim Foerster <JOFT@gmx.de>
  7  *
  8  *  Based on "pcm-indirect.h" (alsa-driver-1.0.13) by
  9  *
 10  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
 11  *                   Jaroslav Kysela <perex@suse.cz>
 12  *
 13  *   This program is free software; you can redistribute it and/or modify
 14  *   it under the terms of the GNU General Public License as published by
 15  *   the Free Software Foundation; either version 2 of the License, or
 16  *   (at your option) any later version.
 17  *
 18  *   This program is distributed in the hope that it will be useful,
 19  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 20  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 21  *   GNU General Public License for more details.
 22  *
 23  *   You should have received a copy of the GNU General Public License
 24  *   along with this program; if not, write to the Free Software
 25  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 26  */
 27 
 28 #ifndef __SOUND_PCM_INDIRECT2_H
 29 #define __SOUND_PCM_INDIRECT2_H
 30 
 31 /* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t */
 32 #include <sound/pcm.h>
 33 
 34 /* Debug options for code which may be removed completely in a final version */
 35 #ifdef CONFIG_SND_DEBUG
 36 #define SND_PCM_INDIRECT2_STAT    /* turn on some "statistics" about the
 37                                    * process of copying bytes from the
 38                                    * intermediate buffer to the hardware
 39                                    * fifo and the other way round
 40                                    */
 41 #endif
 42 
 43 struct snd_pcm_indirect2 {
 44         unsigned int hw_buffer_size;  /* Byte size of hardware buffer */
 45         int hw_ready;                 /* playback: 1 = hw fifo has room left,
 46                                        * 0 = hw fifo is full
 47                                        */
 48         unsigned int min_multiple;
 49         int min_periods;              /* counts number of min. periods until
 50                                        * min_multiple is reached
 51                                        */
 52         int min_period_count;         /* counts bytes to count number of
 53                                        * min. periods
 54                                        */
 55 
 56         unsigned int sw_buffer_size;  /* Byte size of software buffer */
 57 
 58         /* sw_data: position in intermediate buffer, where we will read (or
 59          *          write) from/to next time (to transfer data to/from HW)
 60          */
 61         unsigned int sw_data;         /* Offset to next dst (or src) in sw
 62                                        * ring buffer
 63                                        */
 64         /* easiest case (playback):
 65          * sw_data is nearly the same as ~ runtime->control->appl_ptr, with the
 66          * exception that sw_data is "behind" by the number if bytes ALSA wrote
 67          * to the intermediate buffer last time.
 68          * A call to ack() callback synchronizes both indirectly.
 69          */
 70 
 71         /* We have no real sw_io pointer here. Usually sw_io is pointing to the
 72          * current playback/capture position _inside_ the hardware. Devices
 73          * with plain FIFOs often have no possibility to publish this position.
 74          * So we say: if sw_data is updated, that means bytes were copied to
 75          * the hardware, we increase sw_io by that amount, because there have
 76          * to be as much bytes which were played. So sw_io will stay behind
 77          * sw_data all the time and has to converge to sw_data at the end of
 78          * playback.
 79          */
 80         unsigned int sw_io;           /* Current software pointer in bytes */
 81 
 82         /* sw_ready: number of bytes ALSA copied to the intermediate buffer, so
 83          * it represents the number of bytes which wait for transfer to the HW
 84          */
 85         int sw_ready;             /* Bytes ready to be transferred to/from hw */
 86 
 87         /* appl_ptr: last known position of ALSA (where ALSA is going to write
 88          * next time into the intermediate buffer
 89          */
 90         snd_pcm_uframes_t appl_ptr;   /* Last seen appl_ptr */
 91 
 92         unsigned int bytes2hw;
 93         int check_alignment;
 94 
 95 #ifdef SND_PCM_INDIRECT2_STAT
 96         unsigned int zeros2hw;
 97         unsigned int mul_elapsed;
 98         unsigned int mul_elapsed_real;
 99         unsigned long firstbytetime;
100         unsigned long lastbytetime;
101         unsigned long firstzerotime;
102         unsigned int byte_sizes[64];
103         unsigned int zero_sizes[64];
104         unsigned int min_adds[8];
105         unsigned int mul_adds[8];
106         unsigned int zero_times[3750];  /* = 15s */
107         unsigned int zero_times_saved;
108         unsigned int zero_times_notsaved;
109         unsigned int irq_occured;
110         unsigned int pointer_calls;
111         unsigned int lastdifftime;
112 #endif
113 };
114 
115 typedef size_t (*snd_pcm_indirect2_copy_t) (struct snd_pcm_substream *substream,
116                                            struct snd_pcm_indirect2 *rec,
117                                            size_t bytes);
118 typedef size_t (*snd_pcm_indirect2_zero_t) (struct snd_pcm_substream *substream,
119                                            struct snd_pcm_indirect2 *rec);
120 
121 #ifdef SND_PCM_INDIRECT2_STAT
122 void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream,
123                                    struct snd_pcm_indirect2 *rec);
124 #endif
125 
126 snd_pcm_uframes_t
127 snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream,
128                           struct snd_pcm_indirect2 *rec);
129 void
130 snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream,
131                                      struct snd_pcm_indirect2 *rec,
132                                      snd_pcm_indirect2_copy_t copy,
133                                      snd_pcm_indirect2_zero_t zero);
134 void
135 snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream,
136                                     struct snd_pcm_indirect2 *rec,
137                                     snd_pcm_indirect2_copy_t copy,
138                                     snd_pcm_indirect2_zero_t null);
139 
140 #endif /* __SOUND_PCM_INDIRECT2_H */
141 

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