Straighten out some audio path APIs and misc. audio stuff. Having recording is not a prerequisite to having input/output source selection which is probably most useful when adding a audio input features like FM to a new port without forcing recording to be implemented first.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13599 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 145 insertions, 0 deletions

diff --git a/apps/audio_path.c b/apps/audio_path.c
new file mode 100644
index 0000000..998b298
--- /dev/null
+++ b/apps/audio_path.c
@@ -0,0 +1,145 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Audio signal path management APIs
+ *
+ * Copyright (C) 2007 by Michael Sevakis
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "system.h"
+#include "cpu.h"
+#include "audio.h"
+#include "general.h"
+#include "settings.h"
+#if defined(HAVE_SPDIF_IN) || defined(HAVE_SPDIF_OUT)
+#ifdef HAVE_SPDIF_POWER
+#include "power.h"
+#endif
+#include "spdif.h"
+#endif
+#if CONFIG_TUNER
+#include "radio.h"
+#endif
+
+/* Some audio sources may require a boosted CPU */
+#ifdef HAVE_ADJUSTABLE_CPU_FREQ
+#ifdef HAVE_SPDIF_REC
+#define AUDIO_CPU_BOOST
+#endif
+#endif
+
+#ifndef SIMULATOR
+
+#ifdef AUDIO_CPU_BOOST
+static void audio_cpu_boost(bool state)
+{
+    static bool cpu_boosted = false;
+
+    if (state != cpu_boosted)
+    {
+        cpu_boost(state);
+        cpu_boosted = state;
+    }
+} /* audio_cpu_boost */
+#endif /* AUDIO_CPU_BOOST */
+
+/**
+ * Selects an audio source for recording or playback
+ * powers/unpowers related devices and sets up monitoring.
+ */
+void audio_set_input_source(int source, unsigned flags)
+{
+    /** Do power up/down of associated device(s) **/
+
+    /** SPDIF **/
+#ifdef AUDIO_CPU_BOOST
+    /* Always boost for SPDIF */
+    audio_cpu_boost(source == AUDIO_SRC_SPDIF);
+#endif /* AUDIO_CPU_BOOST */
+
+#ifdef HAVE_SPDIF_POWER
+    /* Check if S/PDIF output power should be switched off or on. NOTE: assumes
+       both optical in and out is controlled by the same power source, which is
+       the case on H1x0. */
+    spdif_power_enable((source == AUDIO_SRC_SPDIF) ||
+                       global_settings.spdif_enable);
+#endif /* HAVE_SPDIF_POWER */
+    /* Set the appropriate feed for spdif output */
+#ifdef HAVE_SPDIF_OUT
+    spdif_set_output_source(source
+        IF_SPDIF_POWER_(, global_settings.spdif_enable));
+#endif /* HAVE_SPDIF_OUT */
+
+    /** Tuner **/
+#if CONFIG_TUNER
+    /* Switch radio off or on per source and flags. */
+    if (source != AUDIO_SRC_FMRADIO)
+        radio_stop();
+    else if (flags & SRCF_FMRADIO_PAUSED)
+        radio_pause();
+    else
+        radio_start();
+#endif
+
+    /* set hardware inputs */
+    audio_input_mux(source, flags);
+} /* audio_set_source */
+
+#ifdef HAVE_SPDIF_IN
+/**
+ * Return SPDIF sample rate index in audio_master_sampr_list. Since we base
+ * our reading on the actual SPDIF sample rate (which might be a bit
+ * inaccurate), we round off to the closest sample rate that is supported by
+ * SPDIF.
+ */
+int audio_get_spdif_sample_rate(void)
+{
+    unsigned long measured_rate = spdif_measure_frequency();
+    /* Find which SPDIF sample rate we're closest to. */
+    return round_value_to_list32(measured_rate, audio_master_sampr_list,
+                                 SAMPR_NUM_FREQ, false);
+} /* audio_get_spdif_sample_rate */
+#endif /* HAVE_SPDIF_IN */
+
+#else /* SIMULATOR */
+
+/** Sim stubs **/
+
+#ifdef AUDIO_CPU_BOOST
+static void audio_cpu_boost(bool state)
+{
+    (void)state;
+} /* audio_cpu_boost */
+#endif /* AUDIO_CPU_BOOST */
+
+void audio_set_output_source(int source)
+{
+   (void)source;
+} /* audio_set_output_source */
+
+void audio_set_input_source(int source, unsigned flags)
+{
+    (void)source;
+    (void)flags;
+} /* audio_set_input_source */
+
+#ifdef HAVE_SPDIF_IN
+int audio_get_spdif_sample_rate(void)
+{
+    return FREQ_44;
+} /* audio_get_spdif_sample_rate */
+#endif /* HAVE_SPDIF_IN */
+
+#endif /* !SIMULATOR */