firmware/export/pcm-internal.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Linus Nielsen Feltzing
  11  * Copyright (C) 2011 by Michael Sevakis
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #ifndef PCM_INTERNAL_H
  23 #define PCM_INTERNAL_H
  24
  25 #include "config.h"
  26
  27 /* Cheapo buffer align macro to align to the 16-16 PCM size */
  28 #define ALIGN_AUDIOBUF(start, size) \
  29     ({ (start) = (void *)(((uintptr_t)(start) + 3) & ~3); \
  30        (size) &= ~3; })
  31
  32 struct pcm_peaks
  33 {
  34     long period;
  35     long tick;
  36     uint16_t val[2];
  37 };
  38
  39 void pcm_do_peak_calculation(struct pcm_peaks *peaks, bool active,
  40                              const void *addr, int count);
  41
  42 /** The following are for internal use between pcm.c and target-
  43     specific portion **/
  44
  45 /* Called by the bottom layer ISR when more data is needed. Returns non-
  46  * zero size if more data is to be played. Setting start to NULL
  47  * forces stop. */
  48 void pcm_play_get_more_callback(void **start, size_t *size);
  49
  50 /* Called by the bottom layer ISR after next transfer has begun in order
  51    to fill more data for next "get more" callback to implement double-buffered
  52    callbacks - except for a couple ASM handlers, help drivers to implement
  53    this functionality with minimal overhead */
  54 static FORCE_INLINE void pcm_play_dma_started_callback(void)
  55 {
  56     extern void (* pcm_play_dma_started)(void);
  57     void (* callback)(void) = pcm_play_dma_started;
  58     if (callback)
  59         callback();
  60 }
  61
  62 extern unsigned long pcm_curr_sampr;
  63 extern unsigned long pcm_sampr;
  64 extern int pcm_fsel;
  65
  66 #ifdef HAVE_PCM_DMA_ADDRESS
  67 void * pcm_dma_addr(void *addr);
  68 #endif
  69
  70 extern volatile bool pcm_playing;
  71 extern volatile bool pcm_paused;
  72
  73 void pcm_play_dma_lock(void);
  74 void pcm_play_dma_unlock(void);
  75 void pcm_play_dma_init(void) INIT_ATTR;
  76 void pcm_play_dma_postinit(void);
  77 void pcm_play_dma_start(const void *addr, size_t size);
  78 void pcm_play_dma_stop(void);
  79 void pcm_play_dma_pause(bool pause);
  80 const void * pcm_play_dma_get_peak_buffer(int *count);
  81
  82 void pcm_dma_apply_settings(void);
  83
  84 #ifdef HAVE_RECORDING
  85
  86 /* DMA transfer in is currently active */
  87 extern volatile bool pcm_recording;
  88
  89 /* APIs implemented in the target-specific portion */
  90 void pcm_rec_dma_init(void);
  91 void pcm_rec_dma_close(void);
  92 void pcm_rec_dma_start(void *addr, size_t size);
  93 void pcm_rec_dma_record_more(void *start, size_t size);
  94 void pcm_rec_dma_stop(void);
  95 const void * pcm_rec_dma_get_peak_buffer(void);
  96
  97 #endif /* HAVE_RECORDING */
  98
  99 #endif /* PCM_INTERNAL_H */