Mercurial > pmdwin

annotate alsa_pcm_api.c @ 5:c4218fbe158f

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Fix indent in pmd_play.c.
author Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
date Tue, 21 May 2013 13:30:32 +0200
parents c55ea9478c80
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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1 #include <stdint.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <fcntl.h>
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5 #include <unistd.h>
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6 #include <errno.h>
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7 #include "alsa_pcm_api.h"
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8 int snd_pcm_hw_params_any(int snd_fd, snd_pcm_hw_params_t *params);
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9 int snd_pcm_hw_params_set_access(int snd_fd, snd_pcm_hw_params_t *params, snd_pcm_access_t access);
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10 int snd_pcm_hw_params_set_format(int snd_fd, snd_pcm_hw_params_t *params, snd_pcm_format_t format);
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11 int snd_pcm_hw_params_set_channels(int snd_fd, snd_pcm_hw_params_t *params, unsigned int val);
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12 int snd_pcm_hw_params_set_rate(int snd_fd, snd_pcm_hw_params_t *params, unsigned int val, int dir);
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13 int snd_pcm_hw_params_set_buffer_size(int snd_fd, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val);
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14 #define MASK_SIZE (SND_MASK_MAX / 32)
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15 #define MASK_OFS(i) ((i) >> 5)
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16 #define MASK_BIT(i) (1U << ((i) & 31))
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17
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18 static inline
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19 snd_interval_t *hw_param_interval(snd_pcm_hw_params_t *params, int var)
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20 {
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21 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
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22 }
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23
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24 static inline
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25 const snd_interval_t *hw_param_interval_c(const snd_pcm_hw_params_t *params, int var)
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26 {
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27 return (const snd_interval_t *)hw_param_interval((snd_pcm_hw_params_t*) params, var);
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28 }
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29
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30 size_t snd_pcm_hw_params_sizeof(void)
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31 {
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32 return sizeof(snd_pcm_hw_params_t);
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33 }
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34
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35 static void snd_interval_any(snd_interval_t *i)
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36 {
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37 i->min = 0;
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38 i->openmin = 0;
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39 i->max = -1;
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40 i->openmax = 0;
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41 i->integer = 0;
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42 i->empty = 0;
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43 }
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44
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45 static inline int snd_interval_empty(const snd_interval_t *i)
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46 {
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47 return i->empty;
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48 }
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49
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50 static inline int snd_interval_checkempty(const snd_interval_t *i)
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51 {
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52 return (i->min > i->max ||
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53 (i->min == i->max && (i->openmin || i->openmax)));
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54 }
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55
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56 /* Return the minimum value for field PAR. */
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57 int _snd_pcm_hw_param_get_min(const snd_pcm_hw_params_t *params,
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58 int var, unsigned int *val, int *dir)
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59 {
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60 const snd_interval_t *i = hw_param_interval_c(params, var);
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61 if (dir)
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62 *dir = i->openmin;
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63 if (val)
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64 *val = i->min;
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65 return 0;
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66 }
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67
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68 /* Return the maximum value for field PAR. */
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69 int _snd_pcm_hw_param_get_max(const snd_pcm_hw_params_t *params,
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70 int var, unsigned int *val, int *dir)
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71 {
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72 const snd_interval_t *i = hw_param_interval_c(params, var);
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73 if (dir)
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74 *dir = - (int) i->openmax;
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75 if (val)
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76 *val = i->max;
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77 return 0;
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78 }
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79
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80 static void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params, int var)
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81 {
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82 snd_interval_any(hw_param_interval(params, var));
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83 params->cmask |= 1 << var;
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84 params->rmask |= 1 << var;
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85 }
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86
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87 int snd_pcm_hw_params_any(int snd_fd, snd_pcm_hw_params_t *params)
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88 {
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89 unsigned int k;
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90 memset(params, 0, sizeof(*params));
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91 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK;
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92 k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
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93 snd_mask_t *mask = &params->masks[k - SNDRV_PCM_HW_PARAM_FIRST_MASK];
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94 memset(mask, 0xff, sizeof(*mask));
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95 params->cmask |= 1 << k;
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96 params->rmask |= 1 << k;
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97 }
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98 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL;
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99 k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
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100 _snd_pcm_hw_param_any(params, k);
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101 params->rmask = ~0U;
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102 params->cmask = 0;
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103 params->info = ~0U;
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104 return(ioctl(snd_fd, SNDRV_PCM_IOCTL_HW_REFINE, params));
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105 }
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106
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107 int snd_pcm_hw_params_store(int snd_fd, snd_pcm_hw_params_t *params)
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108 {
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109 ioctl(snd_fd, SNDRV_PCM_IOCTL_HW_REFINE, params);
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110 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_HW_PARAMS, params) < 0)
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111 return -1;
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112 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
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113 return -1; //-errno;
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114 return 0;
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115 }
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116
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117 snd_pcm_sframes_t snd_pcm_writei(int snd_fd, const void *buffer, snd_pcm_uframes_t size)
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118 {
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119 struct snd_xferi xferi;
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120 xferi.result = 0;
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121 xferi.buf = (char*) buffer;
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122 xferi.frames = size;
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123 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &xferi) < 0)
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124 return -1;
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125 return xferi.result;
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126 }
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127
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128 snd_pcm_sframes_t snd_pcm_writen(int snd_fd, void **bufs, snd_pcm_uframes_t size)
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129 {
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130 struct snd_xfern xfern;
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131 xfern.result = 0;
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132 xfern.bufs = bufs;
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133 xfern.frames = size;
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134 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_WRITEN_FRAMES, &xfern) < 0)
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135 return -1;
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136 return xfern.result;
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137 }
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138
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139 int snd_pcm_prepare(int snd_fd)
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140 {
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141 return ioctl(snd_fd, SNDRV_PCM_IOCTL_PREPARE);
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142 }
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
143
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
144 int snd_pcm_recover(int snd_fd, int err, int silent)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
145 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
146 if (err > 0)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
147 err = -err;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
148 switch (err) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
149 case -EINTR:
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
150 return 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
151 case -EPIPE:
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
152 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_PREPARE) < 0)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
153 return -1; //-errno;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
154 return 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
155 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
156 return err;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
157 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
158
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
159 int snd_pcm_status(int snd_fd, snd_pcm_status_t *status)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
160 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
161 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_STATUS, status) < 0)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
162 return -1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
163 return 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
164 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
165
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
166 static int hw_param_update_var(int snd_fd, snd_pcm_hw_params_t *params,
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
167 int var, int changed)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
168 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
169 if (changed < 0)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
170 return changed;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
171 if (changed) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
172 params->cmask |= 1 << var;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
173 params->rmask |= 1 << var;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
174 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
175 if (params->rmask) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
176 changed = ioctl(snd_fd, SNDRV_PCM_IOCTL_HW_REFINE, params);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
177 if (changed < 0)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
178 return changed;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
179 if (snd_interval_empty(hw_param_interval_c(params, var)))
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
180 return -ENOENT;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
181 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
182 return 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
183 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
184
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
185 static int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
186 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
187 int changed = 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
188 if (snd_interval_empty(i))
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
189 return -ENOENT;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
190 if (i->min < v->min) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
191 i->min = v->min;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
192 i->openmin = v->openmin;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
193 changed = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
194 } else if (i->min == v->min && !i->openmin && v->openmin) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
195 i->openmin = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
196 changed = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
197 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
198 if (i->max > v->max) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
199 i->max = v->max;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
200 i->openmax = v->openmax;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
201 changed = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
202 } else if (i->max == v->max && !i->openmax && v->openmax) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
203 i->openmax = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
204 changed = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
205 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
206 if (!i->integer && v->integer) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
207 i->integer = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
208 changed = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
209 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
210 if (i->integer) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
211 if (i->openmin) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
212 i->min++;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
213 i->openmin = 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
214 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
215 if (i->openmax) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
216 i->max--;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
217 i->openmax = 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
218 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
219 } else if (!i->openmin && !i->openmax && i->min == i->max)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
220 i->integer = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
221 if (snd_interval_checkempty(i)) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
222 i->empty = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
223 return -EINVAL;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
224 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
225 return changed;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
226 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
227
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
228 int _snd_pcm_hw_param_get(const snd_pcm_hw_params_t *params,
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
229 int var, unsigned int *val, int *dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
230 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
231 const snd_interval_t *i = hw_param_interval_c(params, var);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
232 if (snd_interval_empty(i) || !(i->min == i->max || ((i->min + 1 == i->max) && i->openmax)))
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
233 return -EINVAL;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
234 if (dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
235 *dir = i->openmin;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
236 if (val)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
237 *val = i->min;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
238 return 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
239 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
240
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
241 int _snd_pcm_hw_param_set(int snd_fd, snd_pcm_hw_params_t *params, int var,
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
242 unsigned int val, int dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
243 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
244 int err = 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
245 snd_pcm_hw_params_t save = *params;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
246 snd_interval_t *i = hw_param_interval(params, var);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
247 snd_interval_t t;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
248 t.empty = 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
249 t.min = t.max = var;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
250 t.openmin = t.openmax = 0;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
251 t.integer = 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
252 err = snd_interval_refine(i, &t);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
253 err = hw_param_update_var(snd_fd, params, var, err);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
254 if (err)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
255 *params = save;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
256 return err;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
257 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
258
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
259 static inline int _snd_pcm_hw_param_get64(const snd_pcm_hw_params_t *params, int type, unsigned long *val, int *dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
260 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
261 unsigned int _val;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
262 int err = _snd_pcm_hw_param_get(params, type, &_val, dir);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
263 *val = _val;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
264 return err;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
265 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
266
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
267 #if 0
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
268 int snd_pcm_hw_params_get_channels(const snd_pcm_hw_params_t *params, unsigned int *val)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
269 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
270 return _snd_pcm_hw_param_get(params, SNDRV_PCM_HW_PARAM_CHANNELS, val, NULL);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
271 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
272
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
273 int snd_pcm_hw_params_set_channels(int snd_fd, snd_pcm_hw_params_t *params, unsigned int val)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
274 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
275 return _snd_pcm_hw_param_set(snd_fd, params, SNDRV_PCM_HW_PARAM_CHANNELS, val, 0);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
276 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
277
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
278 int snd_pcm_hw_params_get_rate(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
279 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
280 return _snd_pcm_hw_param_get(params, SNDRV_PCM_HW_PARAM_RATE, val, dir);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
281 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
282
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
283 int snd_pcm_hw_params_set_rate(int snd_fd, snd_pcm_hw_params_t *params, unsigned int val, int dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
284 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
285 return _snd_pcm_hw_param_set(snd_fd, params, SNDRV_PCM_HW_PARAM_RATE, val, dir);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
286 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
287
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
288 int snd_pcm_hw_params_get_period_time(const snd_pcm_hw_params_t *params,
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
289 unsigned int *val, int *dir)
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
290 {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
291 return _snd_pcm_hw_param_get(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, val, dir);
c55ea9478c80 Hello Gensokyo!
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292 }
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293
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294 int snd_pcm_hw_params_get_period_size(const snd_pcm_hw_params_t *params,
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295 snd_pcm_uframes_t *val, int *dir)
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296 {
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297 return _snd_pcm_hw_param_get64(params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, val, dir);
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298 }
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299
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300 int snd_pcm_hw_params_get_buffer_size(const snd_pcm_hw_params_t *params,
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301 snd_pcm_uframes_t *val)
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302 {
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303 return _snd_pcm_hw_param_get64(params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, val, NULL);
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304 }
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305
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306 int snd_pcm_hw_params_set_buffer_size(int snd_fd, snd_pcm_hw_params_t *params,
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307 snd_pcm_uframes_t val)
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308 {
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309 return _snd_pcm_hw_param_set(snd_fd, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, val, 0);
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310 }
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311 #endif
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312
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313 static inline unsigned int popcount32(uint32_t mask)
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314 {
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315 register unsigned int y;
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316 y = (mask >> 1) &033333333333;
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317 y = mask - y - ((y >>1) & 033333333333);
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318 return (((y + (y >> 3)) & 030707070707) % 077);
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319 }
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320
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321 int snd_pcm_hw_params_set_access(int pcm_fd, snd_pcm_hw_params_t *params,
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322 snd_pcm_access_t access)
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323 {
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324 snd_pcm_hw_params_t save = *params;
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325 snd_mask_t *param = (snd_mask_t*)&params->masks[SNDRV_PCM_HW_PARAM_ACCESS - SNDRV_PCM_HW_PARAM_FIRST_MASK];
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326 uint32_t i, v = 0;
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327 int err = 0, changed;
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328 for (i = 0; i < MASK_SIZE; i++) {
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329 v += popcount32(param->bits[i]);
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330 }
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331 changed = (v != 1);
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332 v = param->bits[MASK_OFS(access)] & MASK_BIT(access);
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333 memset(param, 0, sizeof(*param));
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334 param->bits[MASK_OFS(access)] = v;
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335 if (changed) {
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336 params->cmask |= 1 << SNDRV_PCM_HW_PARAM_ACCESS;
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337 params->rmask |= 1 << SNDRV_PCM_HW_PARAM_ACCESS;
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338 }
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339 if (params->rmask) {
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340 err = ioctl(pcm_fd, SNDRV_PCM_IOCTL_HW_REFINE, params);
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341 if (err)
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342 *params = save;
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343 }
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344 return err;
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345 }
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346
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347 int snd_pcm_hw_params_set_format(int pcm_fd, snd_pcm_hw_params_t *params,
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348 snd_pcm_format_t format)
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349 {
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350 snd_pcm_hw_params_t save = *params;
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351 snd_mask_t *param = (snd_mask_t*)&params->masks[SNDRV_PCM_HW_PARAM_FORMAT - SNDRV_PCM_HW_PARAM_FIRST_MASK];
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352 uint32_t i, v = 0;
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diff changeset
353 int err = 0, changed;
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354 for (i = 0; i < MASK_SIZE; i++) {
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355 v += popcount32(param->bits[i]);
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356 }
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357 changed = (v != 1);
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358 v = param->bits[MASK_OFS(format)] & MASK_BIT(format);
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diff changeset
359 memset(param, 0, sizeof(*param));
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diff changeset
360 param->bits[MASK_OFS(format)] = v;
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diff changeset
361 if (changed) {
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diff changeset
362 params->cmask |= 1 << SNDRV_PCM_HW_PARAM_ACCESS;
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diff changeset
363 params->rmask |= 1 << SNDRV_PCM_HW_PARAM_ACCESS;
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parents:
diff changeset
364 }
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diff changeset
365 if (params->rmask) {
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diff changeset
366 err = ioctl(pcm_fd, SNDRV_PCM_IOCTL_HW_REFINE, params);
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diff changeset
367 if (err)
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diff changeset
368 *params = save;
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diff changeset
369 }
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diff changeset
370 return err;
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parents:
diff changeset
371 }
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parents:
diff changeset
372
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diff changeset
373 int alsa_audio_close(int snd_fd)
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parents:
diff changeset
374 {
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diff changeset
375 ioctl(snd_fd, SNDRV_PCM_IOCTL_HW_FREE);
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diff changeset
376 return close(snd_fd);
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parents:
diff changeset
377 }
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parents:
diff changeset
378
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
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diff changeset
379 int alsa_audio_open(uint32_t *rate, uint8_t channels, uint32_t *_ver, int mode)
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parents:
diff changeset
380 {
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parents:
diff changeset
381 uint32_t actual_channels;
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
382 snd_pcm_hw_params_t *hwparams;
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parents:
diff changeset
383 *&hwparams = (snd_pcm_hw_params_t *) alloca(snd_pcm_hw_params_sizeof());
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
384 int ver, snd_fd = open("/dev/snd/pcmC0D0p", O_WRONLY|mode);
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parents:
diff changeset
385 if (snd_fd < 0)
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parents:
diff changeset
386 return -1;
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parents:
diff changeset
387
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
388 if (ioctl(snd_fd, SNDRV_PCM_IOCTL_PVERSION, &ver) < 0) {
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
389 if (snd_fd >= 0)
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
390 close(snd_fd);
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
391 return -1;
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
392 }
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
393 if(_ver) *_ver = ver;
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
394
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
395 // Initialize hwparams structure.
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
396 snd_pcm_hw_params_any(snd_fd, hwparams);
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
397
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
398 // this *must* be set, or else the writei (actually an ioctl(), wtf?) below will fail with -EBADF
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
399 snd_pcm_hw_params_set_access(snd_fd, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
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parents:
diff changeset
400 snd_pcm_hw_params_set_format(snd_fd, hwparams, SND_PCM_FORMAT_S16_LE);
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
401
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
402 _snd_pcm_hw_param_set(snd_fd, hwparams, SNDRV_PCM_HW_PARAM_CHANNELS, channels, 0);
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
403 _snd_pcm_hw_param_get(hwparams, SNDRV_PCM_HW_PARAM_CHANNELS, &actual_channels, NULL);
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
404 if ((channels == 1) && (actual_channels == 2)) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
405 // This is an offensively dumb hack that works around the fact that the ALSA devs erroneously believe that HDAudio chipsets cannot playback mono.
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
406 // On any other chipset, it's a terrible idea. In general, it's awful. I'm just lazy. That, and I don't use ALSA myself. :P
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
407 *rate >>= 1;
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
408 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
409 _snd_pcm_hw_param_set(snd_fd, hwparams, SNDRV_PCM_HW_PARAM_RATE, *rate, 0);
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
410 snd_pcm_hw_params_store(snd_fd, hwparams);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
411 _snd_pcm_hw_param_get(hwparams, SNDRV_PCM_HW_PARAM_RATE, rate, NULL);
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
412 if ((channels == 1) && (actual_channels == 2)) {
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
413 *rate <<= 1;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
414 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
415 return snd_fd;
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
416 }
c55ea9478c80 Hello Gensokyo!
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents:
diff changeset
417