apps/audio_path.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Audio signal path management APIs
  11  *
  12  * Copyright (C) 2007 by Michael Sevakis
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23 #include "system.h"
  24 #include "cpu.h"
  25 #include "audio.h"
  26 #include "general.h"
  27 #include "settings.h"
  28 #if defined(HAVE_SPDIF_IN) || defined(HAVE_SPDIF_OUT)
  29 #ifdef HAVE_SPDIF_POWER
  30 #include "power.h"
  31 #endif
  32 #include "spdif.h"
  33 #endif
  34 #if CONFIG_TUNER
  35 #include "radio.h"
  36 #endif
  37
  38 /* Some audio sources may require a boosted CPU */
  39 #ifdef HAVE_ADJUSTABLE_CPU_FREQ
  40 #ifdef HAVE_SPDIF_REC
  41 #define AUDIO_CPU_BOOST
  42 #endif
  43 #endif
  44
  45 #ifndef SIMULATOR
  46
  47 #ifdef AUDIO_CPU_BOOST
  48 static void audio_cpu_boost(bool state)
  49 {
  50     static bool cpu_boosted = false;
  51
  52     if (state != cpu_boosted)
  53     {
  54         cpu_boost(state);
  55         cpu_boosted = state;
  56     }
  57 } /* audio_cpu_boost */
  58 #endif /* AUDIO_CPU_BOOST */
  59
  60 /**
  61  * Selects an audio source for recording or playback
  62  * powers/unpowers related devices and sets up monitoring.
  63  */
  64 void audio_set_input_source(int source, unsigned flags)
  65 {
  66     /** Do power up/down of associated device(s) **/
  67
  68     /** SPDIF **/
  69 #ifdef AUDIO_CPU_BOOST
  70     /* Always boost for SPDIF */
  71     audio_cpu_boost(source == AUDIO_SRC_SPDIF);
  72 #endif /* AUDIO_CPU_BOOST */
  73
  74 #ifdef HAVE_SPDIF_POWER
  75     /* Check if S/PDIF output power should be switched off or on. NOTE: assumes
  76        both optical in and out is controlled by the same power source, which is
  77        the case on H1x0. */
  78     spdif_power_enable((source == AUDIO_SRC_SPDIF) ||
  79                        global_settings.spdif_enable);
  80 #endif /* HAVE_SPDIF_POWER */
  81     /* Set the appropriate feed for spdif output */
  82 #ifdef HAVE_SPDIF_OUT
  83     spdif_set_output_source(source
  84         IF_SPDIF_POWER_(, global_settings.spdif_enable));
  85 #endif /* HAVE_SPDIF_OUT */
  86
  87     /** Tuner **/
  88 #if CONFIG_TUNER
  89     /* Switch radio off or on per source and flags. */
  90     if (source != AUDIO_SRC_FMRADIO)
  91         radio_stop();
  92     else if (flags & SRCF_FMRADIO_PAUSED)
  93         radio_pause();
  94     else
  95         radio_start();
  96 #endif
  97
  98     /* set hardware inputs */
  99     audio_input_mux(source, flags);
 100 } /* audio_set_source */
 101
 102 #ifdef HAVE_SPDIF_IN
 103 /**
 104  * Return SPDIF sample rate index in audio_master_sampr_list. Since we base
 105  * our reading on the actual SPDIF sample rate (which might be a bit
 106  * inaccurate), we round off to the closest sample rate that is supported by
 107  * SPDIF.
 108  */
 109 int audio_get_spdif_sample_rate(void)
 110 {
 111     unsigned long measured_rate = spdif_measure_frequency();
 112     /* Find which SPDIF sample rate we're closest to. */
 113     return round_value_to_list32(measured_rate, audio_master_sampr_list,
 114                                  SAMPR_NUM_FREQ, false);
 115 } /* audio_get_spdif_sample_rate */
 116 #endif /* HAVE_SPDIF_IN */
 117
 118 #else /* SIMULATOR */
 119
 120 /** Sim stubs **/
 121
 122 #ifdef AUDIO_CPU_BOOST
 123 static void audio_cpu_boost(bool state)
 124 {
 125     (void)state;
 126 } /* audio_cpu_boost */
 127 #endif /* AUDIO_CPU_BOOST */
 128
 129 void audio_set_output_source(int source)
 130 {
 131    (void)source;
 132 } /* audio_set_output_source */
 133
 134 void audio_set_input_source(int source, unsigned flags)
 135 {
 136     (void)source;
 137     (void)flags;
 138 } /* audio_set_input_source */
 139
 140 #ifdef HAVE_SPDIF_IN
 141 int audio_get_spdif_sample_rate(void)
 142 {
 143     return FREQ_44;
 144 } /* audio_get_spdif_sample_rate */
 145 #endif /* HAVE_SPDIF_IN */
 146
 147 #endif /* !SIMULATOR */