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3308
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1 /* Play sound with the ALSA library
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2 Copyright (C) 2006 Jerry James.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* TODO: Support asynchronous sound playing; see the NAS support in sound.c */
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24
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25 #include <config.h>
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26 #include "lisp.h"
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27 #include "sound.h"
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28 #include "sysfile.h"
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29
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30 /* We can't just include <alsa/asoundlib.h> because it tries to redefine
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31 * several symbols defined by the previous header files.
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32 */
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33 #include <alsa/input.h>
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34 #include <alsa/output.h>
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35 #include <alsa/conf.h>
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36 #include <alsa/global.h>
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37 #include <alsa/pcm.h>
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38 #include <alsa/error.h>
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39 #include <alsa/hwdep.h>
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40 #include <alsa/rawmidi.h>
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41 #include <alsa/control.h>
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42 #include <alsa/mixer.h>
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43
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44 struct mixer_state
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45 {
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46 snd_mixer_t *mixer;
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47 snd_mixer_elem_t *vol_ctl;
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48
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49 /* Which channels need the old volume restored */
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50 int reset_front_left;
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51 int reset_front_center;
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52 int reset_front_right;
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53 int reset_rear_left;
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54 int reset_rear_center;
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55 int reset_rear_right;
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56 int reset_side_left;
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57 int reset_side_right;
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58 int reset_woofer;
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59
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60 /* Old volumes for the channels */
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61 long front_left_vol;
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62 long front_center_vol;
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63 long front_right_vol;
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64 long rear_left_vol;
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65 long rear_center_vol;
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66 long rear_right_vol;
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67 long side_left_vol;
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68 long side_right_vol;
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69 long woofer_vol;
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70 };
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71
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72 /* Assemble a machine half-word in little-endian order */
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73 #define HALF_LE(arr,start) (arr[start] + (arr[start + 1] << 8))
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74
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75 /* Assemble a machine word in little-endian order */
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76 #define WORD_LE(arr,start) (arr[start] + (arr[start + 1] << 8) + \
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77 (arr[start + 2] << 16) + (arr[start + 3] << 24))
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78
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79 /* Assemble a machine word in big-endian order */
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80 #define WORD_BE(arr,start) ((arr[start] << 24) + (arr[start + 1] << 16) + \
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81 (arr[start + 2] << 8) + arr[start + 3])
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82
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83 /* This function was inspired by miscplay.c.
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84 * Examine sound data to determine its format.
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85 *
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86 * TODO: Detect other formats that ALSA can play, such as GSM and MPEG.
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87 */
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88 static snd_pcm_format_t
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89 analyze_format (const Binbyte *format, int *speed, int *tracks)
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90 {
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91 if (!memcmp (format, "Creative Voice File\x1A\x1A\x00", 22) &&
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92 HALF_LE (format, 22) == ((0x1233 - HALF_LE (format, 24)) & 0xFFFF))
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93 {
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94 /* VOC */
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95 *speed = 8000;
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96 *tracks = 2;
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97 return SND_PCM_FORMAT_U8;
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98 }
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99 else if (!memcmp (format, "RIFF", 4) && !memcmp (format + 8, "WAVEfmt ", 8))
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100 {
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101 /* WAVE */
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102 *speed = WORD_LE (format, 24);
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103 *tracks = format[22];
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104 return format[32] / format[22] == 1
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105 ? SND_PCM_FORMAT_U8
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106 : SND_PCM_FORMAT_S16_LE;
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107 }
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108 else if (!memcmp (format, ".snd", 4))
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109 {
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110 /* Sun/NeXT Audio (big endian) */
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111 if (WORD_BE (format, 4) < 24)
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112 {
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113 *speed = 8000;
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114 *tracks = 1;
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115 return SND_PCM_FORMAT_MU_LAW;
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116 }
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117 *speed = WORD_BE (format, 16);
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118 *tracks = format[23];
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119 if (!memcmp (format + 12, "\000\000\000", 3))
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120 {
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121 switch (format[15])
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122 {
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123 case 1:
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124 case 17:
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125 case 29:
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126 return SND_PCM_FORMAT_MU_LAW;
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127 case 2:
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128 return SND_PCM_FORMAT_S8;
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129 case 3:
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130 return SND_PCM_FORMAT_S16_BE;
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131 case 4:
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132 return SND_PCM_FORMAT_S24_BE;
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133 case 5:
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134 return SND_PCM_FORMAT_S32_BE;
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135 case 23:
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136 case 24:
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137 case 25:
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138 case 26:
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139 return SND_PCM_FORMAT_IMA_ADPCM;
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140 case 27:
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141 return SND_PCM_FORMAT_A_LAW;
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142 default:
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143 break;
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144 }
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145 }
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146 return SND_PCM_FORMAT_UNKNOWN;
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147 }
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148 else if (!memcmp (format, ".sd", 4))
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149 {
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150 /* DEC Audio (little endian) */
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151 if (WORD_LE (format, 4) < 24)
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152 {
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153 *speed = 8000;
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154 *tracks = 1;
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155 return SND_PCM_FORMAT_MU_LAW;
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156 }
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157 *speed = WORD_LE (format, 16);
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158 *tracks = format[20];
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159 if (!memcmp (format + 13, "\000\000\000", 3))
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160 {
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161 switch (format[12])
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162 {
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163 case 1:
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164 case 17:
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165 case 29:
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166 return SND_PCM_FORMAT_MU_LAW;
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167 case 2:
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168 return SND_PCM_FORMAT_S8;
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169 case 3:
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170 return SND_PCM_FORMAT_S16_LE;
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171 case 4:
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172 return SND_PCM_FORMAT_S24_LE;
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173 case 5:
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174 return SND_PCM_FORMAT_S32_LE;
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175 case 23:
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176 case 24:
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177 case 25:
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178 case 26:
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179 return SND_PCM_FORMAT_IMA_ADPCM;
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180 case 27:
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181 return SND_PCM_FORMAT_A_LAW;
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182 default:
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183 break;
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184 }
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185 }
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186 return SND_PCM_FORMAT_UNKNOWN;
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187 }
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188 else
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189 {
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190 /* We don't know what it is. Guess that it is mono audio in unsigned
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191 * byte format. Maybe we should error if we reach this point.
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192 */
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193 *speed = 8000;
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194 *tracks = 1;
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195 return SND_PCM_FORMAT_U8;
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196 }
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197 }
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198
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199 /* Set the volume: if any errors occur, we accept the existing volume */
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200 static void
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201 set_volume (struct mixer_state *mix, int volume)
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202 {
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203 snd_mixer_selem_id_t *volume_id;
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204 long min_vol, max_vol, dev_vol;
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205
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206 if (snd_mixer_open (&mix->mixer, 0) < 0)
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207 return;
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208
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209 if (snd_mixer_attach (mix->mixer, "default") < 0)
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210 return;
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211
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212 if (snd_mixer_selem_register (mix->mixer, NULL, NULL) < 0)
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213 return;
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214
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215 if (snd_mixer_load (mix->mixer) < 0)
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216 return;
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217
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218 snd_mixer_selem_id_alloca (&volume_id);
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219 snd_mixer_selem_id_set_name (volume_id, "PCM");
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220
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221 if ((mix->vol_ctl = snd_mixer_find_selem (mix->mixer, volume_id)) == NULL)
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222 {
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223 snd_mixer_selem_id_set_name (volume_id, "Master");
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224 if ((mix->vol_ctl = snd_mixer_find_selem (mix->mixer, volume_id))
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225 == NULL)
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226 return;
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227 }
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228
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229 /* Translate the Lisp volume range to the device volume range */
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230 if (snd_mixer_selem_get_playback_volume_range (mix->vol_ctl, &min_vol,
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231 &max_vol) < 0)
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232 return;
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233
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234 dev_vol = volume * (max_vol - min_vol) / 100 + min_vol;
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235
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236 /* Record the old volumes */
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237 if (snd_mixer_selem_get_playback_volume
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238 (mix->vol_ctl, SND_MIXER_SCHN_FRONT_LEFT, &mix->front_left_vol) >= 0)
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239 mix->reset_front_left = 1;
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240
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241 if (snd_mixer_selem_get_playback_volume
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242 (mix->vol_ctl, SND_MIXER_SCHN_FRONT_CENTER, &mix->front_center_vol) >= 0)
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243 mix->reset_front_center = 1;
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244
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245 if (snd_mixer_selem_get_playback_volume
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246 (mix->vol_ctl, SND_MIXER_SCHN_FRONT_RIGHT, &mix->front_right_vol) >= 0)
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247 mix->reset_front_right = 1;
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248
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249 if (snd_mixer_selem_get_playback_volume
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250 (mix->vol_ctl, SND_MIXER_SCHN_REAR_LEFT, &mix->rear_left_vol) >= 0)
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251 mix->reset_rear_left = 1;
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252
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253 if (snd_mixer_selem_get_playback_volume
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254 (mix->vol_ctl, SND_MIXER_SCHN_REAR_CENTER, &mix->rear_center_vol) >= 0)
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255 mix->reset_rear_center = 1;
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256
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257 if (snd_mixer_selem_get_playback_volume
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258 (mix->vol_ctl, SND_MIXER_SCHN_REAR_RIGHT, &mix->rear_right_vol) >= 0)
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259 mix->reset_rear_right = 1;
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260
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261 if (snd_mixer_selem_get_playback_volume
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262 (mix->vol_ctl, SND_MIXER_SCHN_SIDE_LEFT, &mix->side_left_vol) >= 0)
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263 mix->reset_side_left = 1;
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264
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265 if (snd_mixer_selem_get_playback_volume
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266 (mix->vol_ctl, SND_MIXER_SCHN_SIDE_RIGHT, &mix->side_right_vol) >= 0)
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267 mix->reset_side_right = 1;
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268
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269 if (snd_mixer_selem_get_playback_volume
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270 (mix->vol_ctl, SND_MIXER_SCHN_WOOFER, &mix->woofer_vol) >= 0)
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271 mix->reset_woofer = 1;
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272
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273 /* Set the volume */
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274 snd_mixer_selem_set_playback_volume_all (mix->vol_ctl, dev_vol);
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275 }
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276
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277 static void
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278 reset_volume (const struct mixer_state *mix)
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279 {
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280 if (mix->reset_front_left)
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281 snd_mixer_selem_set_playback_volume
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282 (mix->vol_ctl, SND_MIXER_SCHN_FRONT_LEFT, mix->front_left_vol);
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283
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284 if (mix->reset_front_center)
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285 snd_mixer_selem_set_playback_volume
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286 (mix->vol_ctl, SND_MIXER_SCHN_FRONT_CENTER, mix->front_center_vol);
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287
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288 if (mix->reset_front_right)
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289 snd_mixer_selem_set_playback_volume
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290 (mix->vol_ctl, SND_MIXER_SCHN_FRONT_RIGHT, mix->front_right_vol);
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291
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292 if (mix->reset_rear_left)
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293 snd_mixer_selem_set_playback_volume
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294 (mix->vol_ctl, SND_MIXER_SCHN_REAR_LEFT, mix->rear_left_vol);
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295
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296 if (mix->reset_rear_center)
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297 snd_mixer_selem_set_playback_volume
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298 (mix->vol_ctl, SND_MIXER_SCHN_REAR_CENTER, mix->rear_center_vol);
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299
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300 if (mix->reset_rear_right)
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301 snd_mixer_selem_set_playback_volume
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302 (mix->vol_ctl, SND_MIXER_SCHN_REAR_RIGHT, mix->rear_right_vol);
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303
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304 if (mix->reset_side_left)
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305 snd_mixer_selem_set_playback_volume
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306 (mix->vol_ctl, SND_MIXER_SCHN_SIDE_LEFT, mix->side_left_vol);
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307
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308 if (mix->reset_side_right)
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309 snd_mixer_selem_set_playback_volume
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310 (mix->vol_ctl, SND_MIXER_SCHN_SIDE_RIGHT, mix->side_right_vol);
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311
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312 if (mix->reset_woofer)
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313 snd_mixer_selem_set_playback_volume
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314 (mix->vol_ctl, SND_MIXER_SCHN_WOOFER, mix->woofer_vol);
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315
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316 snd_mixer_close (mix->mixer);
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317 }
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318
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319 int
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320 alsa_play_sound_data (const Binbyte *data, int length, int volume)
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321 {
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322 snd_pcm_t *pcm_handle;
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323 snd_pcm_hw_params_t *hwparams;
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324 snd_pcm_format_t format;
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325 struct mixer_state mix;
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326 int speed, tracks, err;
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327
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328 /* Set the PCM parameters */
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329 if ((err = snd_pcm_open (&pcm_handle, "default", SND_PCM_STREAM_PLAYBACK,
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330 0)) < 0)
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331 goto error_pcm_open;
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332
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333 snd_pcm_hw_params_alloca (&hwparams);
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334
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335 if ((err = snd_pcm_hw_params_any (pcm_handle, hwparams)) < 0)
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336 goto error_pcm;
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337
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338 format = analyze_format (data, &speed, &tracks);
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339
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340 if ((err = snd_pcm_hw_params_set_access (pcm_handle, hwparams,
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341 SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
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342 goto error_pcm;
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343
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344 if ((err = snd_pcm_hw_params_set_format (pcm_handle, hwparams, format)) < 0)
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345 goto error_pcm;
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346
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347 if ((err = snd_pcm_hw_params_set_rate (pcm_handle, hwparams, speed, 0)) < 0)
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348 goto error_pcm;
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349
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350 if ((err = snd_pcm_hw_params_set_channels (pcm_handle, hwparams, tracks))
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351 < 0)
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352 goto error_pcm;
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353
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354 if ((err = snd_pcm_hw_params (pcm_handle, hwparams)) < 0)
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355 goto error_pcm;
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356
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357 /* Set the volume */
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358 memset (&mix, 0, sizeof (mix));
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359 set_volume (&mix, volume);
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360
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361 /* Play the sound */
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362 if ((err = snd_pcm_writei (pcm_handle, data, length)) < 0)
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363 goto error_mixer;
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364
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365 /* Put the volume back the way it used to be */
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366 reset_volume (&mix);
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367
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368 /* Release resources */
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369 snd_pcm_close (pcm_handle);
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370 return 1;
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371
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372 error_mixer:
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373 reset_volume (&mix);
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374 error_pcm:
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375 snd_pcm_close (pcm_handle);
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376 error_pcm_open:
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377 sound_perror (snd_strerror (err));
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378 return 0;
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379 }
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380
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381 /* Read the sound file into an internal buffer, then call
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382 * alsa_play_sound_data.
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383 */
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384 int
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385 alsa_play_sound_file (const Extbyte *sound_file, int volume)
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386 {
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387 Binbyte *data;
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388 int fd, retval;
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389 struct stat st;
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390
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391 fd = retry_open (sound_file, O_RDONLY, 0);
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|
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392 if (fd < 0) {
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393 sound_perror (sound_file);
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394 return 0;
|
|
|
395 }
|
|
|
396
|
|
|
397 qxe_fstat (fd, &st);
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|
|
398 data = xnew_array (Binbyte, st.st_size);
|
|
|
399 retry_read (fd, data, st.st_size);
|
|
|
400 retry_close (fd);
|
|
|
401 retval = alsa_play_sound_data (data, st.st_size, volume);
|
|
|
402 xfree (data, Binbyte);
|
|
|
403 return retval;
|
|
|
404 }
|
