1 files changed, 140 insertions, 0 deletions
diff --git a/polyp/channelmap.c b/polyp/channelmap.c
new file mode 100644
index 00000000..97876528
--- /dev/null
+++ b/polyp/channelmap.c
@@ -0,0 +1,140 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio 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 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio 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 polypaudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+
+#include "channelmap.h"
+
+
+struct pa_channel_map* pa_channel_map_init(struct pa_channel_map *m) {
+    unsigned c;
+    assert(m);
+
+    for (c = 0; c < PA_CHANNELS_MAX; c++)
+        m->map[c] = PA_CHANNEL_POSITION_INVALID;
+
+    return m;
+}
+
+struct pa_channel_map* pa_channel_map_init_mono(struct pa_channel_map *m) {
+    assert(m);
+
+    pa_channel_map_init(m);
+    m->map[0] = PA_CHANNEL_POSITION_MONO;
+    return m;
+}
+
+struct pa_channel_map* pa_channel_map_init_stereo(struct pa_channel_map *m) {
+    assert(m);
+
+    pa_channel_map_init(m);
+    m->map[0] = PA_CHANNEL_POSITION_LEFT;
+    m->map[1] = PA_CHANNEL_POSITION_RIGHT;
+    return m;
+}
+
+struct pa_channel_map* pa_channel_map_init_auto(struct pa_channel_map *m, int channels) {
+    assert(m);
+    assert(channels > 0);
+
+    pa_channel_map_init(m);
+    
+    switch (channels) {
+        case 1:
+            m->map[0] = PA_CHANNEL_POSITION_MONO;
+            return m;
+
+        case 8:
+            m->mpa[6] = PA_CHANNEL_POSITION_SIDE_LEFT;
+            m->mpa[7] = PA_CHANNEL_POSITION_SIDE_RIGHT;
+            /* Fall through */
+            
+        case 6:
+            m->mpa[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_MAP_FRONT_LEFT;
+            m->map[1] = PA_CHANNEL_MAP_FRONT_RIGHT;
+            return m;
+            
+        default:
+            return NULL;
+    }
+}
+
+
+const char* pa_channel_position_to_string(pa_channel_position_t pos) {
+    const char *const table[] = {
+        [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"
+    };
+
+    if (pos < 0 || pos >= PA_CHANNEL_POSITION_MAX)
+        return NULL;
+
+    return table[pos];
+}
+
+int pa_channel_map_equal(struct pa_channel_map *a, struct pa_channel_map *b, int channels) {
+    char c;
+    
+    assert(a);
+    assert(b);
+    assert(channels > 0);
+
+    if (channels > PA_CHANNELS_MAX)
+        channels = PA_CHANNELS_MAX;
+
+    for (c = 0; c < channels; c++)
+        if (a->map[c] != b->map[c])
+            return 1;
+
+    return 0;
+}