audio-test.c revision ca29fbbb188a1aab9b69776d5dc6bc3e7f812a0a 
1/* Copyright (C) 2010 The Android Open Source Project
2**
3** This software is licensed under the terms of the GNU General Public
4** License version 2, as published by the Free Software Foundation, and
5** may be copied, distributed, and modified under those terms.
6**
7** This program is distributed in the hope that it will be useful,
8** but WITHOUT ANY WARRANTY; without even the implied warranty of
9** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10** GNU General Public License for more details.
11*/
12#include "audio/audio.h"
13#include "android/utils/debug.h"
14
15/* This source file contains a small test audio virtual device that
16 * can be used to check that the emulator properly plays sound on
17 * the host system without having to boot a full system.
18 */
19
20#define SAMPLE_SIZE  16384
21
22typedef struct {
23    QEMUSoundCard  card;
24    SWVoiceOut    *voice;
25    int            pos;
26    short          sample[SAMPLE_SIZE];
27} TestAudio;
28
29static void
30testAudio_audio_callback(void* opaque, int free)
31{
32    TestAudio* ta = opaque;
33
34    //printf("%s: pos=%d free=%d\n", __FUNCTION__, ta->pos, free);
35
36    while (free > 0) {
37        int  avail = SAMPLE_SIZE - ta->pos;
38        if (avail > free)
39            avail = free;
40
41        AUD_write(ta->voice, ta->sample + ta->pos, avail);
42        ta->pos += avail;
43        if (ta->pos >= SAMPLE_SIZE)
44            ta->pos = 0;
45
46        free -= avail;
47    }
48}
49
50static int
51testAudio_init( TestAudio* ta )
52{
53    struct audsettings as;
54
55    AUD_register_card("test_audio", &ta->card);
56
57    as.freq       = 16000;
58    as.nchannels  = 1;
59    as.fmt        = AUD_FMT_S16;
60    as.endianness = AUDIO_HOST_ENDIANNESS;
61
62    ta->voice = AUD_open_out(
63        &ta->card,
64        ta->voice,
65        "test_audio",
66        ta,
67        testAudio_audio_callback,
68        &as);
69
70    if (!ta->voice) {
71        dprint("Cannot open test audio!");
72        return -1;
73    }
74    ta->pos = 0;
75
76    /* Initialize samples */
77    int nn;
78    for (nn = 0; nn < SAMPLE_SIZE; nn++) {
79        ta->sample[nn] = (short)(((nn % (SAMPLE_SIZE/4))*65536/(SAMPLE_SIZE/4)) & 0xffff);
80    }
81
82    AUD_set_active_out(ta->voice, 1);
83    return 0;
84}
85
86static TestAudio*  testAudio;
87
88int
89android_audio_test_start_out(void)
90{
91    if (!testAudio) {
92        testAudio = malloc(sizeof(*testAudio));
93        if (testAudio_init(testAudio) < 0) {
94            free(testAudio);
95            testAudio = NULL;
96            fprintf(stderr, "Could not start audio test!\n");
97            return -1;
98        } else {
99            printf("Audio test started!\n");
100        }
101    }
102    return 0;
103}
104