Adding upstream version 14.2.upstream/14.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 991 insertions, 0 deletions

diff --git a/src/pulse/volume.c b/src/pulse/volume.c
new file mode 100644
index 0000000..fc6ac8d
--- /dev/null
+++ b/src/pulse/volume.c
@@ -0,0 +1,991 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2004-2006 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2.1 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include <pulsecore/core-util.h>
+#include <pulsecore/i18n.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/sample-util.h>
+
+#include "volume.h"
+
+int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) {
+    int i;
+    pa_assert(a);
+    pa_assert(b);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), 0);
+
+    if (PA_UNLIKELY(a == b))
+        return 1;
+
+    pa_return_val_if_fail(pa_cvolume_valid(b), 0);
+
+    if (a->channels != b->channels)
+        return 0;
+
+    for (i = 0; i < a->channels; i++)
+        if (a->values[i] != b->values[i])
+            return 0;
+
+    return 1;
+}
+
+pa_cvolume* pa_cvolume_init(pa_cvolume *a) {
+    unsigned c;
+
+    pa_assert(a);
+
+    a->channels = 0;
+
+    for (c = 0; c < PA_CHANNELS_MAX; c++)
+        a->values[c] = PA_VOLUME_INVALID;
+
+    return a;
+}
+
+pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) {
+    int i;
+
+    pa_assert(a);
+    pa_assert(pa_channels_valid(channels));
+
+    a->channels = (uint8_t) channels;
+
+    for (i = 0; i < a->channels; i++)
+        /* Clamp in case there is stale data that exceeds the current
+         * PA_VOLUME_MAX */
+        a->values[i] = PA_CLAMP_VOLUME(v);
+
+    return a;
+}
+
+pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
+    uint64_t sum = 0;
+    unsigned c;
+
+    pa_assert(a);
+    pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
+
+    for (c = 0; c < a->channels; c++)
+        sum += a->values[c];
+
+    sum /= a->channels;
+
+    return (pa_volume_t) sum;
+}
+
+pa_volume_t pa_cvolume_avg_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+    uint64_t sum = 0;
+    unsigned c, n;
+
+    pa_assert(a);
+
+    if (!cm)
+        return pa_cvolume_avg(a);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
+
+    for (c = n = 0; c < a->channels; c++) {
+
+        if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
+            continue;
+
+        sum += a->values[c];
+        n ++;
+    }
+
+    if (n > 0)
+        sum /= n;
+
+    return (pa_volume_t) sum;
+}
+
+pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
+    pa_volume_t m = PA_VOLUME_MUTED;
+    unsigned c;
+
+    pa_assert(a);
+    pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
+
+    for (c = 0; c < a->channels; c++)
+        if (a->values[c] > m)
+            m = a->values[c];
+
+    return m;
+}
+
+pa_volume_t pa_cvolume_min(const pa_cvolume *a) {
+    pa_volume_t m = PA_VOLUME_MAX;
+    unsigned c;
+
+    pa_assert(a);
+    pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
+
+    for (c = 0; c < a->channels; c++)
+        if (a->values[c] < m)
+            m = a->values[c];
+
+    return m;
+}
+
+pa_volume_t pa_cvolume_max_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+    pa_volume_t m = PA_VOLUME_MUTED;
+    unsigned c;
+
+    pa_assert(a);
+
+    if (!cm)
+        return pa_cvolume_max(a);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
+
+    for (c = 0; c < a->channels; c++) {
+
+        if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
+            continue;
+
+        if (a->values[c] > m)
+            m = a->values[c];
+    }
+
+    return m;
+}
+
+pa_volume_t pa_cvolume_min_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+    pa_volume_t m = PA_VOLUME_MAX;
+    unsigned c;
+
+    pa_assert(a);
+
+    if (!cm)
+        return pa_cvolume_min(a);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
+
+    for (c = 0; c < a->channels; c++) {
+
+        if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
+            continue;
+
+        if (a->values[c] < m)
+            m = a->values[c];
+    }
+
+    return m;
+}
+
+pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
+    uint64_t result;
+
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID);
+
+    /* cbrt((a/PA_VOLUME_NORM)^3*(b/PA_VOLUME_NORM)^3)*PA_VOLUME_NORM = a*b/PA_VOLUME_NORM */
+
+    result = ((uint64_t) a * (uint64_t) b + (uint64_t) PA_VOLUME_NORM / 2ULL) / (uint64_t) PA_VOLUME_NORM;
+
+    if (result > (uint64_t)PA_VOLUME_MAX)
+        pa_log_warn("pa_sw_volume_multiply: Volume exceeds maximum allowed value and will be clipped. Please check your volume settings.");
+
+    return (pa_volume_t) PA_CLAMP_VOLUME(result);
+}
+
+pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
+    uint64_t result;
+
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID);
+
+    if (b <= PA_VOLUME_MUTED)
+        return 0;
+
+    result = ((uint64_t) a * (uint64_t) PA_VOLUME_NORM + (uint64_t) b / 2ULL) / (uint64_t) b;
+
+    if (result > (uint64_t)PA_VOLUME_MAX)
+        pa_log_warn("pa_sw_volume_divide: Volume exceeds maximum allowed value and will be clipped. Please check your volume settings.");
+
+    return (pa_volume_t) PA_CLAMP_VOLUME(result);
+}
+
+/* Amplitude, not power */
+static double linear_to_dB(double v) {
+    return 20.0 * log10(v);
+}
+
+static double dB_to_linear(double v) {
+    return pow(10.0, v / 20.0);
+}
+
+pa_volume_t pa_sw_volume_from_dB(double dB) {
+    if (isinf(dB) < 0 || dB <= PA_DECIBEL_MININFTY)
+        return PA_VOLUME_MUTED;
+
+    return pa_sw_volume_from_linear(dB_to_linear(dB));
+}
+
+double pa_sw_volume_to_dB(pa_volume_t v) {
+
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), PA_DECIBEL_MININFTY);
+
+    if (v <= PA_VOLUME_MUTED)
+        return PA_DECIBEL_MININFTY;
+
+    return linear_to_dB(pa_sw_volume_to_linear(v));
+}
+
+pa_volume_t pa_sw_volume_from_linear(double v) {
+
+    if (v <= 0.0)
+        return PA_VOLUME_MUTED;
+
+    /*
+     * We use a cubic mapping here, as suggested and discussed here:
+     *
+     * http://www.robotplanet.dk/audio/audio_gui_design/
+     * http://lists.linuxaudio.org/pipermail/linux-audio-dev/2009-May/thread.html#23151
+     *
+     * We make sure that the conversion to linear and back yields the
+     * same volume value! That's why we need the lround() below!
+     */
+
+    return (pa_volume_t) PA_CLAMP_VOLUME((uint64_t) lround(cbrt(v) * PA_VOLUME_NORM));
+}
+
+double pa_sw_volume_to_linear(pa_volume_t v) {
+    double f;
+
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0.0);
+
+    if (v <= PA_VOLUME_MUTED)
+        return 0.0;
+
+    if (v == PA_VOLUME_NORM)
+        return 1.0;
+
+    f = ((double) v / PA_VOLUME_NORM);
+
+    return f*f*f;
+}
+
+char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) {
+    unsigned channel;
+    bool first = true;
+    char *e;
+
+    pa_assert(s);
+    pa_assert(l > 0);
+    pa_assert(c);
+
+    pa_init_i18n();
+
+    if (!pa_cvolume_valid(c)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    *(e = s) = 0;
+
+    for (channel = 0; channel < c->channels && l > 1; channel++) {
+        l -= pa_snprintf(e, l, "%s%u: %3u%%",
+                      first ? "" : " ",
+                      channel,
+                      (unsigned)(((uint64_t)c->values[channel] * 100 + (uint64_t)PA_VOLUME_NORM / 2) / (uint64_t)PA_VOLUME_NORM));
+
+        e = strchr(e, 0);
+        first = false;
+    }
+
+    return s;
+}
+
+char *pa_volume_snprint(char *s, size_t l, pa_volume_t v) {
+    pa_assert(s);
+    pa_assert(l > 0);
+
+    pa_init_i18n();
+
+    if (!PA_VOLUME_IS_VALID(v)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    pa_snprintf(s, l, "%3u%%", (unsigned)(((uint64_t)v * 100 + (uint64_t)PA_VOLUME_NORM / 2) / (uint64_t)PA_VOLUME_NORM));
+    return s;
+}
+
+char *pa_sw_cvolume_snprint_dB(char *s, size_t l, const pa_cvolume *c) {
+    unsigned channel;
+    bool first = true;
+    char *e;
+
+    pa_assert(s);
+    pa_assert(l > 0);
+    pa_assert(c);
+
+    pa_init_i18n();
+
+    if (!pa_cvolume_valid(c)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    *(e = s) = 0;
+
+    for (channel = 0; channel < c->channels && l > 1; channel++) {
+        double f = pa_sw_volume_to_dB(c->values[channel]);
+
+        l -= pa_snprintf(e, l, "%s%u: %0.2f dB",
+                         first ? "" : " ",
+                         channel,
+                         isinf(f) < 0 || f <= PA_DECIBEL_MININFTY ? -INFINITY : f);
+
+        e = strchr(e, 0);
+        first = false;
+    }
+
+    return s;
+}
+
+char *pa_cvolume_snprint_verbose(char *s, size_t l, const pa_cvolume *c, const pa_channel_map *map, int print_dB) {
+    char *current = s;
+    bool first = true;
+
+    pa_assert(s);
+    pa_assert(l > 0);
+    pa_assert(c);
+
+    pa_init_i18n();
+
+    if (!pa_cvolume_valid(c)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    pa_assert(!map || (map->channels == c->channels));
+    pa_assert(!map || pa_channel_map_valid(map));
+
+    current[0] = 0;
+
+    for (unsigned channel = 0; channel < c->channels && l > 1; channel++) {
+        char channel_position[32];
+        size_t bytes_printed;
+        char buf[PA_VOLUME_SNPRINT_VERBOSE_MAX];
+
+        if (map)
+            pa_snprintf(channel_position, sizeof(channel_position), "%s", pa_channel_position_to_string(map->map[channel]));
+        else
+            pa_snprintf(channel_position, sizeof(channel_position), "%u", channel);
+
+        bytes_printed = pa_snprintf(current, l, "%s%s: %s",
+                                    first ? "" : ",   ",
+                                    channel_position,
+                                    pa_volume_snprint_verbose(buf, sizeof(buf), c->values[channel], print_dB));
+        l -= bytes_printed;
+        current += bytes_printed;
+        first = false;
+    }
+
+    return s;
+}
+
+char *pa_sw_volume_snprint_dB(char *s, size_t l, pa_volume_t v) {
+    double f;
+
+    pa_assert(s);
+    pa_assert(l > 0);
+
+    pa_init_i18n();
+
+    if (!PA_VOLUME_IS_VALID(v)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    f = pa_sw_volume_to_dB(v);
+    pa_snprintf(s, l, "%0.2f dB", isinf(f) < 0 || f <= PA_DECIBEL_MININFTY ? -INFINITY : f);
+
+    return s;
+}
+
+char *pa_volume_snprint_verbose(char *s, size_t l, pa_volume_t v, int print_dB) {
+    char dB[PA_SW_VOLUME_SNPRINT_DB_MAX];
+
+    pa_assert(s);
+    pa_assert(l > 0);
+
+    pa_init_i18n();
+
+    if (!PA_VOLUME_IS_VALID(v)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    pa_snprintf(s, l, "%" PRIu32 " / %3u%%%s%s",
+                v,
+                (unsigned)(((uint64_t)v * 100 + (uint64_t)PA_VOLUME_NORM / 2) / (uint64_t)PA_VOLUME_NORM),
+                print_dB ? " / " : "",
+                print_dB ? pa_sw_volume_snprint_dB(dB, sizeof(dB), v) : "");
+
+    return s;
+}
+
+int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) {
+    unsigned c;
+    pa_assert(a);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), 0);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0);
+
+    for (c = 0; c < a->channels; c++)
+        if (a->values[c] != v)
+            return 0;
+
+    return 1;
+}
+
+pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
+    unsigned i;
+
+    pa_assert(dest);
+    pa_assert(a);
+    pa_assert(b);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+    pa_return_val_if_fail(pa_cvolume_valid(b), NULL);
+
+    dest->channels = PA_MIN(a->channels, b->channels);
+
+    for (i = 0; i < dest->channels; i++)
+        dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]);
+
+    return dest;
+}
+
+pa_cvolume *pa_sw_cvolume_multiply_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b) {
+    unsigned i;
+
+    pa_assert(dest);
+    pa_assert(a);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), NULL);
+
+    for (i = 0; i < a->channels; i++)
+        dest->values[i] = pa_sw_volume_multiply(a->values[i], b);
+
+    dest->channels = (uint8_t) i;
+
+    return dest;
+}
+
+pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
+    unsigned i;
+
+    pa_assert(dest);
+    pa_assert(a);
+    pa_assert(b);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+    pa_return_val_if_fail(pa_cvolume_valid(b), NULL);
+
+    dest->channels = PA_MIN(a->channels, b->channels);
+
+    for (i = 0; i < dest->channels; i++)
+        dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]);
+
+    return dest;
+}
+
+pa_cvolume *pa_sw_cvolume_divide_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b) {
+    unsigned i;
+
+    pa_assert(dest);
+    pa_assert(a);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), NULL);
+
+    for (i = 0; i < a->channels; i++)
+        dest->values[i] = pa_sw_volume_divide(a->values[i], b);
+
+    dest->channels = (uint8_t) i;
+
+    return dest;
+}
+
+int pa_cvolume_valid(const pa_cvolume *v) {
+    unsigned c;
+
+    pa_assert(v);
+
+    if (!pa_channels_valid(v->channels))
+        return 0;
+
+    for (c = 0; c < v->channels; c++)
+        if (!PA_VOLUME_IS_VALID(v->values[c]))
+            return 0;
+
+    return 1;
+}
+
+static bool on_left(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_LEFT);
+}
+
+static bool on_right(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_RIGHT);
+}
+
+static bool on_center(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_CENTER);
+}
+
+static bool on_hfe(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_HFE);
+}
+
+static bool on_lfe(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_LFE);
+}
+
+static bool on_front(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_FRONT);
+}
+
+static bool on_rear(pa_channel_position_t p) {
+    return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_REAR);
+}
+
+pa_cvolume *pa_cvolume_remap(pa_cvolume *v, const pa_channel_map *from, const pa_channel_map *to) {
+    int a, b;
+    pa_cvolume result;
+
+    pa_assert(v);
+    pa_assert(from);
+    pa_assert(to);
+
+    pa_return_val_if_fail(pa_channel_map_valid(to), NULL);
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, from), NULL);
+
+    if (pa_channel_map_equal(from, to))
+        return v;
+
+    result.channels = to->channels;
+
+    for (b = 0; b < to->channels; b++) {
+        pa_volume_t k = 0;
+        int n = 0;
+
+        for (a = 0; a < from->channels; a++)
+            if (from->map[a] == to->map[b]) {
+                k += v->values[a];
+                n ++;
+            }
+
+        if (n <= 0) {
+            for (a = 0; a < from->channels; a++)
+                if ((on_left(from->map[a]) && on_left(to->map[b])) ||
+                    (on_right(from->map[a]) && on_right(to->map[b])) ||
+                    (on_center(from->map[a]) && on_center(to->map[b])) ||
+                    (on_lfe(from->map[a]) && on_lfe(to->map[b]))) {
+
+                    k += v->values[a];
+                    n ++;
+                }
+        }
+
+        if (n <= 0)
+            k = pa_cvolume_avg(v);
+        else
+            k /= n;
+
+        result.values[b] = k;
+    }
+
+    *v = result;
+    return v;
+}
+
+int pa_cvolume_compatible(const pa_cvolume *v, const pa_sample_spec *ss) {
+
+    pa_assert(v);
+    pa_assert(ss);
+
+    pa_return_val_if_fail(pa_cvolume_valid(v), 0);
+    pa_return_val_if_fail(pa_sample_spec_valid(ss), 0);
+
+    return v->channels == ss->channels;
+}
+
+int pa_cvolume_compatible_with_channel_map(const pa_cvolume *v, const pa_channel_map *cm) {
+    pa_assert(v);
+    pa_assert(cm);
+
+    pa_return_val_if_fail(pa_cvolume_valid(v), 0);
+    pa_return_val_if_fail(pa_channel_map_valid(cm), 0);
+
+    return v->channels == cm->channels;
+}
+
+/*
+ * Returns the average volume of l and r, where l and r are two disjoint sets of channels
+ * (e g left and right, or front and rear).
+ */
+static void get_avg(const pa_channel_map *map, const pa_cvolume *v, pa_volume_t *l, pa_volume_t *r,
+                    bool (*on_l)(pa_channel_position_t), bool (*on_r)(pa_channel_position_t)) {
+    int c;
+    pa_volume_t left = 0, right = 0;
+    unsigned n_left = 0, n_right = 0;
+
+    pa_assert(v);
+    pa_assert(map);
+    pa_assert(map->channels == v->channels);
+    pa_assert(l);
+    pa_assert(r);
+
+    for (c = 0; c < map->channels; c++) {
+        if (on_l(map->map[c])) {
+            left += v->values[c];
+            n_left++;
+        } else if (on_r(map->map[c])) {
+            right += v->values[c];
+            n_right++;
+        }
+    }
+
+    if (n_left <= 0)
+        *l = PA_VOLUME_NORM;
+    else
+        *l = left / n_left;
+
+    if (n_right <= 0)
+        *r = PA_VOLUME_NORM;
+    else
+        *r = right / n_right;
+}
+
+float pa_cvolume_get_balance(const pa_cvolume *v, const pa_channel_map *map) {
+    pa_volume_t left, right;
+
+    pa_assert(v);
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f);
+
+    if (!pa_channel_map_can_balance(map))
+        return 0.0f;
+
+    get_avg(map, v, &left, &right, on_left, on_right);
+
+    if (left == right)
+        return 0.0f;
+
+    /*   1.0,  0.0  =>  -1.0
+         0.0,  1.0  =>   1.0
+         0.0,  0.0  =>   0.0
+         0.5,  0.5  =>   0.0
+         1.0,  0.5  =>  -0.5
+         1.0,  0.25 => -0.75
+         0.75, 0.25 => -0.66
+         0.5,  0.25 => -0.5   */
+
+    if (left > right)
+        return -1.0f + ((float) right / (float) left);
+    else
+        return 1.0f - ((float) left / (float) right);
+}
+
+static pa_cvolume* set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance,
+                               bool (*on_l)(pa_channel_position_t), bool (*on_r)(pa_channel_position_t)) {
+
+    pa_volume_t left, nleft, right, nright, m;
+    unsigned c;
+
+    get_avg(map, v, &left, &right, on_l, on_r);
+
+    m = PA_MAX(left, right);
+
+    if (new_balance <= 0) {
+        nright = (new_balance + 1.0f) * m;
+        nleft = m;
+    } else {
+        nleft = (1.0f - new_balance) * m;
+        nright = m;
+    }
+
+    for (c = 0; c < map->channels; c++) {
+        if (on_l(map->map[c])) {
+            if (left == 0)
+                v->values[c] = nleft;
+            else
+                v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nleft) / (uint64_t) left);
+        } else if (on_r(map->map[c])) {
+            if (right == 0)
+                v->values[c] = nright;
+            else
+                v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nright) / (uint64_t) right);
+        }
+    }
+
+    return v;
+}
+
+
+pa_cvolume* pa_cvolume_set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance) {
+    pa_assert(map);
+    pa_assert(v);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL);
+    pa_return_val_if_fail(new_balance >= -1.0f, NULL);
+    pa_return_val_if_fail(new_balance <= 1.0f, NULL);
+
+    if (!pa_channel_map_can_balance(map))
+        return v;
+
+    return set_balance(v, map, new_balance, on_left, on_right);
+}
+
+pa_cvolume* pa_cvolume_scale(pa_cvolume *v, pa_volume_t max) {
+    unsigned c;
+    pa_volume_t t = 0;
+
+    pa_assert(v);
+
+    pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(max), NULL);
+
+    t = pa_cvolume_max(v);
+
+    if (t <= PA_VOLUME_MUTED)
+        return pa_cvolume_set(v, v->channels, max);
+
+    for (c = 0; c < v->channels; c++)
+        v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
+
+    return v;
+}
+
+pa_cvolume* pa_cvolume_scale_mask(pa_cvolume *v, pa_volume_t max, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+    unsigned c;
+    pa_volume_t t = 0;
+
+    pa_assert(v);
+
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(max), NULL);
+
+    if (!cm)
+        return pa_cvolume_scale(v, max);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, cm), NULL);
+
+    t = pa_cvolume_max_mask(v, cm, mask);
+
+    if (t <= PA_VOLUME_MUTED)
+        return pa_cvolume_set(v, v->channels, max);
+
+    for (c = 0; c < v->channels; c++)
+        v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
+
+    return v;
+}
+
+float pa_cvolume_get_fade(const pa_cvolume *v, const pa_channel_map *map) {
+    pa_volume_t rear, front;
+
+    pa_assert(v);
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f);
+
+    if (!pa_channel_map_can_fade(map))
+        return 0.0f;
+
+    get_avg(map, v, &rear, &front, on_rear, on_front);
+
+    if (front == rear)
+        return 0.0f;
+
+    if (rear > front)
+        return -1.0f + ((float) front / (float) rear);
+    else
+        return 1.0f - ((float) rear / (float) front);
+}
+
+pa_cvolume* pa_cvolume_set_fade(pa_cvolume *v, const pa_channel_map *map, float new_fade) {
+    pa_assert(map);
+    pa_assert(v);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL);
+    pa_return_val_if_fail(new_fade >= -1.0f, NULL);
+    pa_return_val_if_fail(new_fade <= 1.0f, NULL);
+
+    if (!pa_channel_map_can_fade(map))
+        return v;
+
+    return set_balance(v, map, new_fade, on_rear, on_front);
+}
+
+float pa_cvolume_get_lfe_balance(const pa_cvolume *v, const pa_channel_map *map) {
+    pa_volume_t hfe, lfe;
+
+    pa_assert(v);
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f);
+
+    if (!pa_channel_map_can_lfe_balance(map))
+        return 0.0f;
+
+    get_avg(map, v, &hfe, &lfe, on_hfe, on_lfe);
+
+    if (hfe == lfe)
+        return 0.0f;
+
+    if (hfe > lfe)
+        return -1.0f + ((float) lfe / (float) hfe);
+    else
+        return 1.0f - ((float) hfe / (float) lfe);
+}
+
+pa_cvolume* pa_cvolume_set_lfe_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance) {
+    pa_assert(map);
+    pa_assert(v);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL);
+    pa_return_val_if_fail(new_balance >= -1.0f, NULL);
+    pa_return_val_if_fail(new_balance <= 1.0f, NULL);
+
+    if (!pa_channel_map_can_lfe_balance(map))
+        return v;
+
+    return set_balance(v, map, new_balance, on_hfe, on_lfe);
+}
+
+pa_cvolume* pa_cvolume_set_position(
+        pa_cvolume *cv,
+        const pa_channel_map *map,
+        pa_channel_position_t t,
+        pa_volume_t v) {
+
+    unsigned c;
+    bool good = false;
+
+    pa_assert(cv);
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv, map), NULL);
+    pa_return_val_if_fail(t < PA_CHANNEL_POSITION_MAX, NULL);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), NULL);
+
+    for (c = 0; c < map->channels; c++)
+        if (map->map[c] == t) {
+            cv->values[c] = v;
+            good = true;
+        }
+
+    return good ? cv : NULL;
+}
+
+pa_volume_t pa_cvolume_get_position(
+        const pa_cvolume *cv,
+        const pa_channel_map *map,
+        pa_channel_position_t t) {
+
+    unsigned c;
+    pa_volume_t v = PA_VOLUME_MUTED;
+
+    pa_assert(cv);
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv, map), PA_VOLUME_MUTED);
+    pa_return_val_if_fail(t < PA_CHANNEL_POSITION_MAX, PA_VOLUME_MUTED);
+
+    for (c = 0; c < map->channels; c++)
+        if (map->map[c] == t)
+            if (cv->values[c] > v)
+                v = cv->values[c];
+
+    return v;
+}
+
+pa_cvolume* pa_cvolume_merge(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
+    unsigned i;
+
+    pa_assert(dest);
+    pa_assert(a);
+    pa_assert(b);
+
+    pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+    pa_return_val_if_fail(pa_cvolume_valid(b), NULL);
+
+    dest->channels = PA_MIN(a->channels, b->channels);
+
+    for (i = 0; i < dest->channels; i++)
+        dest->values[i] = PA_MAX(a->values[i], b->values[i]);
+
+    return dest;
+}
+
+pa_cvolume* pa_cvolume_inc_clamp(pa_cvolume *v, pa_volume_t inc, pa_volume_t limit) {
+    pa_volume_t m;
+
+    pa_assert(v);
+
+    pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(inc), NULL);
+
+    m = pa_cvolume_max(v);
+
+    if (m >= limit - inc)
+        m = limit;
+    else
+        m += inc;
+
+    return pa_cvolume_scale(v, m);
+}
+
+pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc) {
+    return pa_cvolume_inc_clamp(v, inc, PA_VOLUME_MAX);
+}
+
+pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec) {
+    pa_volume_t m;
+
+    pa_assert(v);
+
+    pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
+    pa_return_val_if_fail(PA_VOLUME_IS_VALID(dec), NULL);
+
+    m = pa_cvolume_max(v);
+
+    if (m <= PA_VOLUME_MUTED + dec)
+        m = PA_VOLUME_MUTED;
+    else
+        m -= dec;
+
+    return pa_cvolume_scale(v, m);
+}