/*
  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg 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.
  *
  * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * audio conversion routines
  */
 

 #include "avstring.h"
 #include "avutil.h"

 #include "audioconvert.h"
 
 static const char * const channel_names[] = {
     "FL", "FR", "FC", "LFE", "BL",  "BR",  "FLC", "FRC",
     "BC", "SL", "SR", "TC",  "TFL", "TFC", "TFR", "TBL",
     "TBC", "TBR",
     [29] = "DL",
     [30] = "DR",
 };
 
 static const char *get_channel_name(int channel_id)
 {
     if (channel_id < 0 || channel_id >= FF_ARRAY_ELEMS(channel_names))
         return NULL;
     return channel_names[channel_id];
 }
 
 static const struct {
     const char *name;
     int         nb_channels;
     int64_t     layout;
 } channel_layout_map[] = {
     { "mono",        1,  AV_CH_LAYOUT_MONO },
     { "stereo",      2,  AV_CH_LAYOUT_STEREO },
     { "4.0",         4,  AV_CH_LAYOUT_4POINT0 },
     { "quad",        4,  AV_CH_LAYOUT_QUAD },
     { "5.0",         5,  AV_CH_LAYOUT_5POINT0 },
     { "5.0",         5,  AV_CH_LAYOUT_5POINT0_BACK },
     { "5.1",         6,  AV_CH_LAYOUT_5POINT1 },
     { "5.1",         6,  AV_CH_LAYOUT_5POINT1_BACK },
     { "5.1+downmix", 8,  AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
     { "7.1",         8,  AV_CH_LAYOUT_7POINT1 },
     { "7.1(wide)",   8,  AV_CH_LAYOUT_7POINT1_WIDE },
     { "7.1+downmix", 10, AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
     { 0 }
 };
 
 int64_t av_get_channel_layout(const char *name)
 {
     int i = 0;
     do {
         if (!strcmp(channel_layout_map[i].name, name))
             return channel_layout_map[i].layout;
         i++;
     } while (channel_layout_map[i].name);
 
     return 0;
 }
 
 void av_get_channel_layout_string(char *buf, int buf_size,
                                   int nb_channels, int64_t channel_layout)
 {
     int i;
 

     if (nb_channels <= 0)
         nb_channels = av_get_channel_layout_nb_channels(channel_layout);
 

     for (i = 0; channel_layout_map[i].name; i++)
         if (nb_channels    == channel_layout_map[i].nb_channels &&
             channel_layout == channel_layout_map[i].layout) {
             av_strlcpy(buf, channel_layout_map[i].name, buf_size);
             return;
         }
 
     snprintf(buf, buf_size, "%d channels", nb_channels);
     if (channel_layout) {
         int i,ch;
         av_strlcat(buf, " (", buf_size);
         for(i=0,ch=0; i<64; i++) {
             if ((channel_layout & (1L<<i))) {
                 const char *name = get_channel_name(i);
                 if (name) {
                     if (ch>0) av_strlcat(buf, "|", buf_size);
                     av_strlcat(buf, name, buf_size);
                 }
                 ch++;
             }
         }
         av_strlcat(buf, ")", buf_size);
     }
 }
 
 int av_get_channel_layout_nb_channels(int64_t channel_layout)
 {
     int count;
     uint64_t x = channel_layout;
     for (count = 0; x; count++)
         x &= x-1; // unset lowest set bit
     return count;
 }