SphinxBase  0.6
ad_pulse.c
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37 
38 /* Input for Pulseaudio */
39 
40 #include <stdio.h>
41 #include <string.h>
42 #include <config.h>
43 
44 #include <pulse/pulseaudio.h>
45 #include <pulse/simple.h>
46 
47 #include "prim_type.h"
48 #include "ad.h"
49 
50 ad_rec_t *
51 ad_open_dev(const char *dev, int32 samples_per_sec)
52 {
53  ad_rec_t *handle;
54  pa_simple *pa;
55  pa_sample_spec ss;
56  int error;
57 
58  ss.format = PA_SAMPLE_S16LE;
59  ss.channels = 1;
60  ss.rate = 16000; //samples_per_sec;
61 
62  pa = pa_simple_new(NULL, "ASR", PA_STREAM_RECORD, dev, "Speech", &ss, NULL, NULL, &error);
63  if (pa == NULL) {
64  fprintf(stderr, "Error opening audio device %s for capture: %s\n", dev, pa_strerror(error));
65  return NULL;
66  }
67 
68  if ((handle = (ad_rec_t *) calloc(1, sizeof(ad_rec_t))) == NULL) {
69  fprintf(stderr, "Failed to allocate memory for ad device\n");
70  return NULL;
71  }
72 
73  handle->pa = pa;
74  handle->recording = 0;
75  handle->sps = samples_per_sec;
76  handle->bps = sizeof(int16);
77 
78  return handle;
79 }
80 
81 
82 ad_rec_t *
83 ad_open_sps(int32 samples_per_sec)
84 {
85  return ad_open_dev(DEFAULT_DEVICE, samples_per_sec);
86 }
87 
88 ad_rec_t *
89 ad_open(void)
90 {
91  return ad_open_sps(DEFAULT_SAMPLES_PER_SEC);
92 }
93 
94 
95 int32
96 ad_start_rec(ad_rec_t * r)
97 {
98  if (r->recording)
99  return AD_ERR_GEN;
100 
101  r->recording = 1;
102 
103  return 0;
104 }
105 
106 
107 int32
108 ad_stop_rec(ad_rec_t * r)
109 {
110  if (!r->recording)
111  return AD_ERR_GEN;
112 
113  r->recording = 0;
114 
115  return 0;
116 }
117 
118 
119 int32
120 ad_read(ad_rec_t * r, int16 * buf, int32 max)
121 {
122  int error;
123 
124  if (!r->recording)
125  return AD_EOF;
126 
127  if (pa_simple_read(r->pa, (void*)buf, max * 2, &error) < 0) {
128  fprintf(stderr, "Failed to read speech: %s\n", pa_strerror(error));
129  }
130 
131  return max;
132 }
133 
134 
135 int32
136 ad_close(ad_rec_t * r)
137 {
138  if (r->pa == NULL)
139  return AD_ERR_NOT_OPEN;
140 
141  if (r->recording) {
142  if (ad_stop_rec(r) < 0)
143  return AD_ERR_GEN;
144  }
145  pa_simple_free(r->pa);
146  free(r);
147 
148  return 0;
149 }
Definition: ad.h:255
int32 sps
Samples/sec.
Definition: ad.h:256
Basic type definitions used in Sphinx.
int32 bps
Bytes/sample.
Definition: ad.h:257
SPHINXBASE_EXPORT ad_rec_t * ad_open(void)
Open the default audio device.
Definition: ad_alsa.c:296
generic live audio interface for recording and playback
SPHINXBASE_EXPORT ad_rec_t * ad_open_dev(const char *dev, int32 samples_per_sec)
Open a specific audio device for recording.
Definition: ad_alsa.c:252
SPHINXBASE_EXPORT ad_rec_t * ad_open_sps(int32 samples_per_sec)
Open the default audio device with a given sampling rate.
Definition: ad_alsa.c:290