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