Adding upstream version 14.2.upstream/14.2upstream

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

1 files changed, 833 insertions, 0 deletions

diff --git a/src/pulse/channelmap.c b/src/pulse/channelmap.c
new file mode 100644
index 0000000..c44dca4
--- /dev/null
+++ b/src/pulse/channelmap.c
@@ -0,0 +1,833 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2005-2006 Lennart Poettering
+  Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
+
+  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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/i18n.h>
+#include <pulsecore/core-util.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/bitset.h>
+#include <pulsecore/sample-util.h>
+
+#include "channelmap.h"
+
+const char *const table[PA_CHANNEL_POSITION_MAX] = {
+    [PA_CHANNEL_POSITION_MONO] = "mono",
+
+    [PA_CHANNEL_POSITION_FRONT_CENTER] = "front-center",
+    [PA_CHANNEL_POSITION_FRONT_LEFT] = "front-left",
+    [PA_CHANNEL_POSITION_FRONT_RIGHT] = "front-right",
+
+    [PA_CHANNEL_POSITION_REAR_CENTER] = "rear-center",
+    [PA_CHANNEL_POSITION_REAR_LEFT] = "rear-left",
+    [PA_CHANNEL_POSITION_REAR_RIGHT] = "rear-right",
+
+    [PA_CHANNEL_POSITION_LFE] = "lfe",
+
+    [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = "front-left-of-center",
+    [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = "front-right-of-center",
+
+    [PA_CHANNEL_POSITION_SIDE_LEFT] = "side-left",
+    [PA_CHANNEL_POSITION_SIDE_RIGHT] = "side-right",
+
+    [PA_CHANNEL_POSITION_AUX0] = "aux0",
+    [PA_CHANNEL_POSITION_AUX1] = "aux1",
+    [PA_CHANNEL_POSITION_AUX2] = "aux2",
+    [PA_CHANNEL_POSITION_AUX3] = "aux3",
+    [PA_CHANNEL_POSITION_AUX4] = "aux4",
+    [PA_CHANNEL_POSITION_AUX5] = "aux5",
+    [PA_CHANNEL_POSITION_AUX6] = "aux6",
+    [PA_CHANNEL_POSITION_AUX7] = "aux7",
+    [PA_CHANNEL_POSITION_AUX8] = "aux8",
+    [PA_CHANNEL_POSITION_AUX9] = "aux9",
+    [PA_CHANNEL_POSITION_AUX10] = "aux10",
+    [PA_CHANNEL_POSITION_AUX11] = "aux11",
+    [PA_CHANNEL_POSITION_AUX12] = "aux12",
+    [PA_CHANNEL_POSITION_AUX13] = "aux13",
+    [PA_CHANNEL_POSITION_AUX14] = "aux14",
+    [PA_CHANNEL_POSITION_AUX15] = "aux15",
+    [PA_CHANNEL_POSITION_AUX16] = "aux16",
+    [PA_CHANNEL_POSITION_AUX17] = "aux17",
+    [PA_CHANNEL_POSITION_AUX18] = "aux18",
+    [PA_CHANNEL_POSITION_AUX19] = "aux19",
+    [PA_CHANNEL_POSITION_AUX20] = "aux20",
+    [PA_CHANNEL_POSITION_AUX21] = "aux21",
+    [PA_CHANNEL_POSITION_AUX22] = "aux22",
+    [PA_CHANNEL_POSITION_AUX23] = "aux23",
+    [PA_CHANNEL_POSITION_AUX24] = "aux24",
+    [PA_CHANNEL_POSITION_AUX25] = "aux25",
+    [PA_CHANNEL_POSITION_AUX26] = "aux26",
+    [PA_CHANNEL_POSITION_AUX27] = "aux27",
+    [PA_CHANNEL_POSITION_AUX28] = "aux28",
+    [PA_CHANNEL_POSITION_AUX29] = "aux29",
+    [PA_CHANNEL_POSITION_AUX30] = "aux30",
+    [PA_CHANNEL_POSITION_AUX31] = "aux31",
+
+    [PA_CHANNEL_POSITION_TOP_CENTER] = "top-center",
+
+    [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = "top-front-center",
+    [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = "top-front-left",
+    [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = "top-front-right",
+
+    [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = "top-rear-center",
+    [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = "top-rear-left",
+    [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = "top-rear-right"
+};
+
+const char *const pretty_table[PA_CHANNEL_POSITION_MAX] = {
+    [PA_CHANNEL_POSITION_MONO] = N_("Mono"),
+
+    [PA_CHANNEL_POSITION_FRONT_CENTER] = N_("Front Center"),
+    [PA_CHANNEL_POSITION_FRONT_LEFT] = N_("Front Left"),
+    [PA_CHANNEL_POSITION_FRONT_RIGHT] = N_("Front Right"),
+
+    [PA_CHANNEL_POSITION_REAR_CENTER] = N_("Rear Center"),
+    [PA_CHANNEL_POSITION_REAR_LEFT] = N_("Rear Left"),
+    [PA_CHANNEL_POSITION_REAR_RIGHT] = N_("Rear Right"),
+
+    [PA_CHANNEL_POSITION_LFE] = N_("Subwoofer"),
+
+    [PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER] = N_("Front Left-of-center"),
+    [PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER] = N_("Front Right-of-center"),
+
+    [PA_CHANNEL_POSITION_SIDE_LEFT] = N_("Side Left"),
+    [PA_CHANNEL_POSITION_SIDE_RIGHT] = N_("Side Right"),
+
+    [PA_CHANNEL_POSITION_AUX0] = N_("Auxiliary 0"),
+    [PA_CHANNEL_POSITION_AUX1] = N_("Auxiliary 1"),
+    [PA_CHANNEL_POSITION_AUX2] = N_("Auxiliary 2"),
+    [PA_CHANNEL_POSITION_AUX3] = N_("Auxiliary 3"),
+    [PA_CHANNEL_POSITION_AUX4] = N_("Auxiliary 4"),
+    [PA_CHANNEL_POSITION_AUX5] = N_("Auxiliary 5"),
+    [PA_CHANNEL_POSITION_AUX6] = N_("Auxiliary 6"),
+    [PA_CHANNEL_POSITION_AUX7] = N_("Auxiliary 7"),
+    [PA_CHANNEL_POSITION_AUX8] = N_("Auxiliary 8"),
+    [PA_CHANNEL_POSITION_AUX9] = N_("Auxiliary 9"),
+    [PA_CHANNEL_POSITION_AUX10] = N_("Auxiliary 10"),
+    [PA_CHANNEL_POSITION_AUX11] = N_("Auxiliary 11"),
+    [PA_CHANNEL_POSITION_AUX12] = N_("Auxiliary 12"),
+    [PA_CHANNEL_POSITION_AUX13] = N_("Auxiliary 13"),
+    [PA_CHANNEL_POSITION_AUX14] = N_("Auxiliary 14"),
+    [PA_CHANNEL_POSITION_AUX15] = N_("Auxiliary 15"),
+    [PA_CHANNEL_POSITION_AUX16] = N_("Auxiliary 16"),
+    [PA_CHANNEL_POSITION_AUX17] = N_("Auxiliary 17"),
+    [PA_CHANNEL_POSITION_AUX18] = N_("Auxiliary 18"),
+    [PA_CHANNEL_POSITION_AUX19] = N_("Auxiliary 19"),
+    [PA_CHANNEL_POSITION_AUX20] = N_("Auxiliary 20"),
+    [PA_CHANNEL_POSITION_AUX21] = N_("Auxiliary 21"),
+    [PA_CHANNEL_POSITION_AUX22] = N_("Auxiliary 22"),
+    [PA_CHANNEL_POSITION_AUX23] = N_("Auxiliary 23"),
+    [PA_CHANNEL_POSITION_AUX24] = N_("Auxiliary 24"),
+    [PA_CHANNEL_POSITION_AUX25] = N_("Auxiliary 25"),
+    [PA_CHANNEL_POSITION_AUX26] = N_("Auxiliary 26"),
+    [PA_CHANNEL_POSITION_AUX27] = N_("Auxiliary 27"),
+    [PA_CHANNEL_POSITION_AUX28] = N_("Auxiliary 28"),
+    [PA_CHANNEL_POSITION_AUX29] = N_("Auxiliary 29"),
+    [PA_CHANNEL_POSITION_AUX30] = N_("Auxiliary 30"),
+    [PA_CHANNEL_POSITION_AUX31] = N_("Auxiliary 31"),
+
+    [PA_CHANNEL_POSITION_TOP_CENTER] = N_("Top Center"),
+
+    [PA_CHANNEL_POSITION_TOP_FRONT_CENTER] = N_("Top Front Center"),
+    [PA_CHANNEL_POSITION_TOP_FRONT_LEFT] = N_("Top Front Left"),
+    [PA_CHANNEL_POSITION_TOP_FRONT_RIGHT] = N_("Top Front Right"),
+
+    [PA_CHANNEL_POSITION_TOP_REAR_CENTER] = N_("Top Rear Center"),
+    [PA_CHANNEL_POSITION_TOP_REAR_LEFT] = N_("Top Rear Left"),
+    [PA_CHANNEL_POSITION_TOP_REAR_RIGHT] = N_("Top Rear Right")
+};
+
+pa_channel_map* pa_channel_map_init(pa_channel_map *m) {
+    unsigned c;
+    pa_assert(m);
+
+    m->channels = 0;
+
+    for (c = 0; c < PA_CHANNELS_MAX; c++)
+        m->map[c] = PA_CHANNEL_POSITION_INVALID;
+
+    return m;
+}
+
+pa_channel_map* pa_channel_map_init_mono(pa_channel_map *m) {
+    pa_assert(m);
+
+    pa_channel_map_init(m);
+
+    m->channels = 1;
+    m->map[0] = PA_CHANNEL_POSITION_MONO;
+    return m;
+}
+
+pa_channel_map* pa_channel_map_init_stereo(pa_channel_map *m) {
+    pa_assert(m);
+
+    pa_channel_map_init(m);
+
+    m->channels = 2;
+    m->map[0] = PA_CHANNEL_POSITION_LEFT;
+    m->map[1] = PA_CHANNEL_POSITION_RIGHT;
+    return m;
+}
+
+pa_channel_map* pa_channel_map_init_auto(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def) {
+    pa_assert(m);
+    pa_assert(pa_channels_valid(channels));
+    pa_assert(def < PA_CHANNEL_MAP_DEF_MAX);
+
+    pa_channel_map_init(m);
+
+    m->channels = (uint8_t) channels;
+
+    switch (def) {
+        case PA_CHANNEL_MAP_AIFF:
+
+            /* This is somewhat compatible with RFC3551 */
+
+            switch (channels) {
+                case 1:
+                    m->map[0] = PA_CHANNEL_POSITION_MONO;
+                    return m;
+
+                case 6:
+                    m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
+                    m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
+                    m->map[3] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+                    m->map[4] = PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
+                    m->map[5] = PA_CHANNEL_POSITION_REAR_CENTER;
+                    return m;
+
+                case 5:
+                    m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
+                    m->map[3] = PA_CHANNEL_POSITION_REAR_LEFT;
+                    m->map[4] = PA_CHANNEL_POSITION_REAR_RIGHT;
+                    /* Fall through */
+
+                case 2:
+                    m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+                    return m;
+
+                case 3:
+                    m->map[0] = PA_CHANNEL_POSITION_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_RIGHT;
+                    m->map[2] = PA_CHANNEL_POSITION_CENTER;
+                    return m;
+
+                case 4:
+                    m->map[0] = PA_CHANNEL_POSITION_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_CENTER;
+                    m->map[2] = PA_CHANNEL_POSITION_RIGHT;
+                    m->map[3] = PA_CHANNEL_POSITION_REAR_CENTER;
+                    return m;
+
+                default:
+                    return NULL;
+            }
+
+        case PA_CHANNEL_MAP_ALSA:
+
+            switch (channels) {
+                case 1:
+                    m->map[0] = PA_CHANNEL_POSITION_MONO;
+                    return m;
+
+                case 8:
+                    m->map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
+                    m->map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
+                    /* Fall through */
+
+                case 6:
+                    m->map[5] = PA_CHANNEL_POSITION_LFE;
+                    /* Fall through */
+
+                case 5:
+                    m->map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
+                    /* Fall through */
+
+                case 4:
+                    m->map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
+                    m->map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
+                    /* Fall through */
+
+                case 2:
+                    m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+                    return m;
+
+                default:
+                    return NULL;
+            }
+
+        case PA_CHANNEL_MAP_AUX: {
+            unsigned i;
+
+            for (i = 0; i < channels; i++)
+                m->map[i] = PA_CHANNEL_POSITION_AUX0 + i;
+
+            return m;
+        }
+
+        case PA_CHANNEL_MAP_WAVEEX:
+
+            /* Following http://www.microsoft.com/whdc/device/audio/multichaud.mspx#EKLAC */
+
+            switch (channels) {
+                case 1:
+                    m->map[0] = PA_CHANNEL_POSITION_MONO;
+                    return m;
+
+                case 18:
+                    m->map[15] = PA_CHANNEL_POSITION_TOP_REAR_LEFT;
+                    m->map[16] = PA_CHANNEL_POSITION_TOP_REAR_CENTER;
+                    m->map[17] = PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
+                    /* Fall through */
+
+                case 15:
+                    m->map[12] = PA_CHANNEL_POSITION_TOP_FRONT_LEFT;
+                    m->map[13] = PA_CHANNEL_POSITION_TOP_FRONT_CENTER;
+                    m->map[14] = PA_CHANNEL_POSITION_TOP_FRONT_RIGHT;
+                    /* Fall through */
+
+                case 12:
+                    m->map[11] = PA_CHANNEL_POSITION_TOP_CENTER;
+                    /* Fall through */
+
+                case 11:
+                    m->map[9] = PA_CHANNEL_POSITION_SIDE_LEFT;
+                    m->map[10] = PA_CHANNEL_POSITION_SIDE_RIGHT;
+                    /* Fall through */
+
+                case 9:
+                    m->map[8] = PA_CHANNEL_POSITION_REAR_CENTER;
+                    /* Fall through */
+
+                case 8:
+                    m->map[6] = PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
+                    m->map[7] = PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
+                    /* Fall through */
+
+                case 6:
+                    m->map[4] = PA_CHANNEL_POSITION_REAR_LEFT;
+                    m->map[5] = PA_CHANNEL_POSITION_REAR_RIGHT;
+                    /* Fall through */
+
+                case 4:
+                    m->map[3] = PA_CHANNEL_POSITION_LFE;
+                    /* Fall through */
+
+                case 3:
+                    m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
+                    /* Fall through */
+
+                case 2:
+                    m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+                    return m;
+
+                default:
+                    return NULL;
+            }
+
+        case PA_CHANNEL_MAP_OSS:
+
+            switch (channels) {
+                case 1:
+                    m->map[0] = PA_CHANNEL_POSITION_MONO;
+                    return m;
+
+                case 8:
+                    m->map[6] = PA_CHANNEL_POSITION_REAR_LEFT;
+                    m->map[7] = PA_CHANNEL_POSITION_REAR_RIGHT;
+                    /* Fall through */
+
+                case 6:
+                    m->map[4] = PA_CHANNEL_POSITION_SIDE_LEFT;
+                    m->map[5] = PA_CHANNEL_POSITION_SIDE_RIGHT;
+                    /* Fall through */
+
+                case 4:
+                    m->map[3] = PA_CHANNEL_POSITION_LFE;
+                    /* Fall through */
+
+                case 3:
+                    m->map[2] = PA_CHANNEL_POSITION_FRONT_CENTER;
+                    /* Fall through */
+
+                case 2:
+                    m->map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+                    m->map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+                    return m;
+
+                default:
+                    return NULL;
+            }
+
+        default:
+            pa_assert_not_reached();
+    }
+}
+
+pa_channel_map* pa_channel_map_init_extend(pa_channel_map *m, unsigned channels, pa_channel_map_def_t def) {
+    unsigned c;
+
+    pa_assert(m);
+    pa_assert(pa_channels_valid(channels));
+    pa_assert(def < PA_CHANNEL_MAP_DEF_MAX);
+
+    pa_channel_map_init(m);
+
+    for (c = channels; c > 0; c--) {
+
+        if (pa_channel_map_init_auto(m, c, def)) {
+            unsigned i = 0;
+
+            for (; c < channels; c++) {
+
+                m->map[c] = PA_CHANNEL_POSITION_AUX0 + i;
+                i++;
+            }
+
+            m->channels = (uint8_t) channels;
+
+            return m;
+        }
+    }
+
+    return NULL;
+}
+
+const char* pa_channel_position_to_string(pa_channel_position_t pos) {
+
+    if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
+        return NULL;
+
+    return table[pos];
+}
+
+const char* pa_channel_position_to_pretty_string(pa_channel_position_t pos) {
+
+    if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
+        return NULL;
+
+    pa_init_i18n();
+
+    return _(pretty_table[pos]);
+}
+
+int pa_channel_map_equal(const pa_channel_map *a, const pa_channel_map *b) {
+    unsigned c;
+
+    pa_assert(a);
+    pa_assert(b);
+
+    pa_return_val_if_fail(pa_channel_map_valid(a), 0);
+
+    if (PA_UNLIKELY(a == b))
+        return 1;
+
+    pa_return_val_if_fail(pa_channel_map_valid(b), 0);
+
+    if (a->channels != b->channels)
+        return 0;
+
+    for (c = 0; c < a->channels; c++)
+        if (a->map[c] != b->map[c])
+            return 0;
+
+    return 1;
+}
+
+char* pa_channel_map_snprint(char *s, size_t l, const pa_channel_map *map) {
+    unsigned channel;
+    bool first = true;
+    char *e;
+
+    pa_assert(s);
+    pa_assert(l > 0);
+    pa_assert(map);
+
+    pa_init_i18n();
+
+    if (!pa_channel_map_valid(map)) {
+        pa_snprintf(s, l, _("(invalid)"));
+        return s;
+    }
+
+    *(e = s) = 0;
+
+    for (channel = 0; channel < map->channels && l > 1; channel++) {
+        l -= pa_snprintf(e, l, "%s%s",
+                      first ? "" : ",",
+                      pa_channel_position_to_string(map->map[channel]));
+
+        e = strchr(e, 0);
+        first = false;
+    }
+
+    return s;
+}
+
+pa_channel_position_t pa_channel_position_from_string(const char *p) {
+    pa_channel_position_t i;
+    pa_assert(p);
+
+    /* Some special aliases */
+    if (pa_streq(p, "left"))
+        return PA_CHANNEL_POSITION_LEFT;
+    else if (pa_streq(p, "right"))
+        return PA_CHANNEL_POSITION_RIGHT;
+    else if (pa_streq(p, "center"))
+        return PA_CHANNEL_POSITION_CENTER;
+    else if (pa_streq(p, "subwoofer"))
+        return PA_CHANNEL_POSITION_SUBWOOFER;
+
+    for (i = 0; i < PA_CHANNEL_POSITION_MAX; i++)
+        if (pa_streq(p, table[i]))
+            return i;
+
+    return PA_CHANNEL_POSITION_INVALID;
+}
+
+pa_channel_map *pa_channel_map_parse(pa_channel_map *rmap, const char *s) {
+    const char *state;
+    pa_channel_map map;
+    char *p;
+
+    pa_assert(rmap);
+    pa_assert(s);
+
+    pa_channel_map_init(&map);
+
+    /* We don't need to match against the well known channel mapping
+     * "mono" here explicitly, because that can be understood as
+     * listing with one channel called "mono". */
+
+    if (pa_streq(s, "stereo")) {
+        map.channels = 2;
+        map.map[0] = PA_CHANNEL_POSITION_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_RIGHT;
+        goto finish;
+    } else if (pa_streq(s, "surround-21")) {
+        map.channels = 3;
+        map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        map.map[2] = PA_CHANNEL_POSITION_LFE;
+        goto finish;
+    } else if (pa_streq(s, "surround-40")) {
+        map.channels = 4;
+        map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
+        map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
+        goto finish;
+    } else if (pa_streq(s, "surround-41")) {
+        map.channels = 5;
+        map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
+        map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
+        map.map[4] = PA_CHANNEL_POSITION_LFE;
+        goto finish;
+    } else if (pa_streq(s, "surround-50")) {
+        map.channels = 5;
+        map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
+        map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
+        map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
+        goto finish;
+    } else if (pa_streq(s, "surround-51")) {
+        map.channels = 6;
+        map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
+        map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
+        map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
+        map.map[5] = PA_CHANNEL_POSITION_LFE;
+        goto finish;
+    } else if (pa_streq(s, "surround-71")) {
+        map.channels = 8;
+        map.map[0] = PA_CHANNEL_POSITION_FRONT_LEFT;
+        map.map[1] = PA_CHANNEL_POSITION_FRONT_RIGHT;
+        map.map[2] = PA_CHANNEL_POSITION_REAR_LEFT;
+        map.map[3] = PA_CHANNEL_POSITION_REAR_RIGHT;
+        map.map[4] = PA_CHANNEL_POSITION_FRONT_CENTER;
+        map.map[5] = PA_CHANNEL_POSITION_LFE;
+        map.map[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
+        map.map[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
+        goto finish;
+    }
+
+    state = NULL;
+    map.channels = 0;
+
+    while ((p = pa_split(s, ",", &state))) {
+        pa_channel_position_t f;
+
+        if (map.channels >= PA_CHANNELS_MAX) {
+            pa_xfree(p);
+            return NULL;
+        }
+
+        if ((f = pa_channel_position_from_string(p)) == PA_CHANNEL_POSITION_INVALID) {
+            pa_xfree(p);
+            return NULL;
+        }
+
+        map.map[map.channels++] = f;
+        pa_xfree(p);
+    }
+
+finish:
+
+    if (!pa_channel_map_valid(&map))
+        return NULL;
+
+    *rmap = map;
+    return rmap;
+}
+
+int pa_channel_map_valid(const pa_channel_map *map) {
+    unsigned c;
+
+    pa_assert(map);
+
+    if (!pa_channels_valid(map->channels))
+        return 0;
+
+    for (c = 0; c < map->channels; c++)
+        if (map->map[c] < 0 || map->map[c] >= PA_CHANNEL_POSITION_MAX)
+            return 0;
+
+    return 1;
+}
+
+int pa_channel_map_compatible(const pa_channel_map *map, const pa_sample_spec *ss) {
+    pa_assert(map);
+    pa_assert(ss);
+
+    pa_return_val_if_fail(pa_channel_map_valid(map), 0);
+    pa_return_val_if_fail(pa_sample_spec_valid(ss), 0);
+
+    return map->channels == ss->channels;
+}
+
+int pa_channel_map_superset(const pa_channel_map *a, const pa_channel_map *b) {
+    pa_channel_position_mask_t am, bm;
+
+    pa_assert(a);
+    pa_assert(b);
+
+    pa_return_val_if_fail(pa_channel_map_valid(a), 0);
+
+    if (PA_UNLIKELY(a == b))
+        return 1;
+
+    pa_return_val_if_fail(pa_channel_map_valid(b), 0);
+
+    am = pa_channel_map_mask(a);
+    bm = pa_channel_map_mask(b);
+
+    return (bm & am) == bm;
+}
+
+int pa_channel_map_can_balance(const pa_channel_map *map) {
+    pa_channel_position_mask_t m;
+
+    pa_assert(map);
+    pa_return_val_if_fail(pa_channel_map_valid(map), 0);
+
+    m = pa_channel_map_mask(map);
+
+    return
+        (PA_CHANNEL_POSITION_MASK_LEFT & m) &&
+        (PA_CHANNEL_POSITION_MASK_RIGHT & m);
+}
+
+int pa_channel_map_can_fade(const pa_channel_map *map) {
+    pa_channel_position_mask_t m;
+
+    pa_assert(map);
+    pa_return_val_if_fail(pa_channel_map_valid(map), 0);
+
+    m = pa_channel_map_mask(map);
+
+    return
+        (PA_CHANNEL_POSITION_MASK_FRONT & m) &&
+        (PA_CHANNEL_POSITION_MASK_REAR & m);
+}
+
+int pa_channel_map_can_lfe_balance(const pa_channel_map *map) {
+    pa_channel_position_mask_t m;
+
+    pa_assert(map);
+    pa_return_val_if_fail(pa_channel_map_valid(map), 0);
+
+    m = pa_channel_map_mask(map);
+
+    return
+        (PA_CHANNEL_POSITION_MASK_LFE & m) &&
+        (PA_CHANNEL_POSITION_MASK_HFE & m);
+}
+
+const char* pa_channel_map_to_name(const pa_channel_map *map) {
+    pa_bitset_t in_map[PA_BITSET_ELEMENTS(PA_CHANNEL_POSITION_MAX)];
+    unsigned c;
+
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_channel_map_valid(map), NULL);
+
+    memset(in_map, 0, sizeof(in_map));
+
+    for (c = 0; c < map->channels; c++)
+        pa_bitset_set(in_map, map->map[c], true);
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_MONO, -1))
+        return "mono";
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT, -1))
+        return "stereo";
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, -1))
+        return "surround-40";
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_LFE, -1))
+        return "surround-41";
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_FRONT_CENTER, -1))
+        return "surround-50";
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE, -1))
+        return "surround-51";
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE,
+                         PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT, -1))
+        return "surround-71";
+
+    return NULL;
+}
+
+const char* pa_channel_map_to_pretty_name(const pa_channel_map *map) {
+    pa_bitset_t in_map[PA_BITSET_ELEMENTS(PA_CHANNEL_POSITION_MAX)];
+    unsigned c;
+
+    pa_assert(map);
+
+    pa_return_val_if_fail(pa_channel_map_valid(map), NULL);
+
+    memset(in_map, 0, sizeof(in_map));
+
+    for (c = 0; c < map->channels; c++)
+        pa_bitset_set(in_map, map->map[c], true);
+
+    pa_init_i18n();
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_MONO, -1))
+        return _("Mono");
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_LEFT, PA_CHANNEL_POSITION_RIGHT, -1))
+        return _("Stereo");
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT, -1))
+        return _("Surround 4.0");
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_LFE, -1))
+        return _("Surround 4.1");
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_FRONT_CENTER, -1))
+        return _("Surround 5.0");
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE, -1))
+        return _("Surround 5.1");
+
+    if (pa_bitset_equals(in_map, PA_CHANNEL_POSITION_MAX,
+                         PA_CHANNEL_POSITION_FRONT_LEFT, PA_CHANNEL_POSITION_FRONT_RIGHT,
+                         PA_CHANNEL_POSITION_REAR_LEFT, PA_CHANNEL_POSITION_REAR_RIGHT,
+                         PA_CHANNEL_POSITION_FRONT_CENTER, PA_CHANNEL_POSITION_LFE,
+                         PA_CHANNEL_POSITION_SIDE_LEFT, PA_CHANNEL_POSITION_SIDE_RIGHT, -1))
+        return _("Surround 7.1");
+
+    return NULL;
+}
+
+int pa_channel_map_has_position(const pa_channel_map *map, pa_channel_position_t p) {
+    unsigned c;
+
+    pa_return_val_if_fail(pa_channel_map_valid(map), 0);
+    pa_return_val_if_fail(p < PA_CHANNEL_POSITION_MAX, 0);
+
+    for (c = 0; c < map->channels; c++)
+        if (map->map[c] == p)
+            return 1;
+
+    return 0;
+}
+
+pa_channel_position_mask_t pa_channel_map_mask(const pa_channel_map *map) {
+    unsigned c;
+    pa_channel_position_mask_t r = 0;
+
+    pa_return_val_if_fail(pa_channel_map_valid(map), 0);
+
+    for (c = 0; c < map->channels; c++)
+        r |= PA_CHANNEL_POSITION_MASK(map->map[c]);
+
+    return r;
+}