File: banshee-player-equalizer.c

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banshee 2.6.2-3
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//
// banshee-player-equalizer.c
//
// Authors:
//   Alexander Hixon <hixon.alexander@mediati.org>
//   Aaron Bockover <abockover@novell.com>
//   Sebastian Dröge  <slomo@circular-chaos.org>
//   Julien Moutte <julien@fluendo.com>
//
// Copyright (C) 2005-2008 Novell, Inc.
// Copyright (C) 2010 Fluendo S.A.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#include "banshee-player-private.h"

enum _BpEqStatus {
    BP_EQ_STATUS_UNCHECKED,
    BP_EQ_STATUS_DISABLED,
    BP_EQ_STATUS_USE_BUILTIN,
    BP_EQ_STATUS_USE_SYSTEM
};

// ---------------------------------------------------------------------------
// Internal Functions
// ---------------------------------------------------------------------------

GstElement *
_bp_equalizer_new (BansheePlayer *player)
{
    GstElement *equalizer;
    
    if (player->equalizer_status == BP_EQ_STATUS_DISABLED) {
        return NULL;
    }
    
    if (player->equalizer_status == BP_EQ_STATUS_UNCHECKED || 
        player->equalizer_status == BP_EQ_STATUS_USE_BUILTIN) {
        equalizer = gst_element_factory_make ("banshee-equalizer", "banshee-equalizer");
        if (equalizer != NULL) {
            if (player->equalizer_status == BP_EQ_STATUS_UNCHECKED) {
                player->equalizer_status = BP_EQ_STATUS_USE_BUILTIN;
                bp_debug ("Using built-in equalizer element");
            }
            
            return equalizer;
        }
    }
    
    if (player->equalizer_status == BP_EQ_STATUS_UNCHECKED || 
        player->equalizer_status == BP_EQ_STATUS_USE_SYSTEM) {
        equalizer = gst_element_factory_make ("equalizer-10bands", "equalizer-10bands");
        if (equalizer != NULL) {
            GstElementFactory *efactory = NULL;

            if (player->equalizer_status == BP_EQ_STATUS_USE_SYSTEM) {
                return equalizer;
            }
            
            efactory = gst_element_get_factory (equalizer);
            if (gst_plugin_feature_check_version (GST_PLUGIN_FEATURE (efactory), 0, 10, 9)) {
                bp_debug ("Using system (gst-plugins-good) equalizer element");
                player->equalizer_status = BP_EQ_STATUS_USE_SYSTEM;
                return equalizer;
            }
            
            bp_debug ("Buggy system equalizer found. gst-plugins-good 0.10.9 or better "
                "required, or build Banshee with the built-in equalizer.");
            gst_object_unref (equalizer);
        } else {
            bp_debug ("No system equalizer found");
        }
    }
    
    bp_debug ("No suitable equalizer element could be found, disabling EQ for this session");
    player->equalizer_status = BP_EQ_STATUS_DISABLED;
    return NULL;
}


// ---------------------------------------------------------------------------
// Public Functions
// ---------------------------------------------------------------------------

P_INVOKE gboolean
bp_equalizer_is_supported (BansheePlayer *player)
{
    return player != NULL && player->equalizer != NULL && player->preamp != NULL;
}

P_INVOKE void
bp_equalizer_set_preamp_level (BansheePlayer *player, gdouble level)
{
    g_return_if_fail (IS_BANSHEE_PLAYER (player));

    if (player->equalizer != NULL && player->preamp != NULL) {
        g_object_set (player->preamp, "volume", level, NULL);
    }
}

P_INVOKE void
bp_equalizer_set_gain (BansheePlayer *player, guint bandnum, gdouble gain)
{
    g_return_if_fail (IS_BANSHEE_PLAYER (player));
    
    if (player->equalizer != NULL) {
        GObject *band;

        g_return_if_fail (bandnum < gst_child_proxy_get_children_count (GST_CHILD_PROXY (player->equalizer)));

        band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (player->equalizer), bandnum);
        g_object_set (band, "gain", gain, NULL);
        g_object_unref (band);
    }
}

P_INVOKE void
bp_equalizer_get_bandrange (BansheePlayer *player, gint *min, gint *max)
{    
    GParamSpec *pspec;
    GParamSpecDouble *dpspec;
    
    g_return_if_fail (IS_BANSHEE_PLAYER (player));
    
    if (player->equalizer == NULL) {
        return;
    }
    
    // Fetch gain range of first band (since it should be the same for the rest)
    pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (player->equalizer), "band0::gain");
    if (pspec == NULL)
        pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (player->equalizer), "band0");

    if (pspec != NULL && G_IS_PARAM_SPEC_DOUBLE (pspec)) {
        dpspec = (GParamSpecDouble *) pspec;
        *min = (gint) dpspec->minimum;
        *max = (gint) dpspec->maximum;
        return;
    } else {
       g_warning ("Could not find valid gain range for equalizer element");
    }
}

P_INVOKE guint
bp_equalizer_get_nbands (BansheePlayer *player)
{
    guint count;
    
    g_return_val_if_fail (IS_BANSHEE_PLAYER (player), 0);

    if (player->equalizer == NULL) {
        return 0;
    }

    count = gst_child_proxy_get_children_count (GST_CHILD_PROXY (player->equalizer));
    return count;
}

P_INVOKE void
bp_equalizer_get_frequencies (BansheePlayer *player, gdouble **freq)
{
    gint i, count;
    
    g_return_if_fail (IS_BANSHEE_PLAYER (player));

    if (player->equalizer == NULL) {
        return;
    }

    count = gst_child_proxy_get_children_count (GST_CHILD_PROXY (player->equalizer));
    
    for (i = 0; i < count; i++) {
        GObject *band;
        
        band = gst_child_proxy_get_child_by_index (GST_CHILD_PROXY (player->equalizer), i);
        g_object_get (G_OBJECT (band), "freq", &(*freq)[i], NULL);
        g_object_unref (band);
    }
}