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/* Copyright (C) 2010 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program 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 General Public License for more details.
*/
#include "audio/audio.h"
#include "android/utils/debug.h"
/* This source file contains a small test audio virtual device that
* can be used to check that the emulator properly plays sound on
* the host system without having to boot a full system.
*/
#define SAMPLE_SIZE 16384
typedef struct {
QEMUSoundCard card;
SWVoiceOut *voice;
int pos;
short sample[SAMPLE_SIZE];
} TestAudio;
static void
testAudio_audio_callback(void* opaque, int free)
{
TestAudio* ta = opaque;
//printf("%s: pos=%d free=%d\n", __FUNCTION__, ta->pos, free);
while (free > 0) {
int avail = SAMPLE_SIZE - ta->pos;
if (avail > free)
avail = free;
AUD_write(ta->voice, ta->sample + ta->pos, avail);
ta->pos += avail;
if (ta->pos >= SAMPLE_SIZE)
ta->pos = 0;
free -= avail;
}
}
static int
testAudio_init( TestAudio* ta )
{
struct audsettings as;
AUD_register_card("test_audio", &ta->card);
as.freq = 16000;
as.nchannels = 1;
as.fmt = AUD_FMT_S16;
as.endianness = AUDIO_HOST_ENDIANNESS;
ta->voice = AUD_open_out(
&ta->card,
ta->voice,
"test_audio",
ta,
testAudio_audio_callback,
&as);
if (!ta->voice) {
dprint("Cannot open test audio!");
return -1;
}
ta->pos = 0;
/* Initialize samples */
int nn;
for (nn = 0; nn < SAMPLE_SIZE; nn++) {
ta->sample[nn] = (short)(((nn % (SAMPLE_SIZE/4))*65536/(SAMPLE_SIZE/4)) & 0xffff);
}
AUD_set_active_out(ta->voice, 1);
return 0;
}
static TestAudio* testAudio;
int
android_audio_test_start_out(void)
{
if (!testAudio) {
testAudio = malloc(sizeof(*testAudio));
if (testAudio_init(testAudio) < 0) {
free(testAudio);
testAudio = NULL;
fprintf(stderr, "Could not start audio test!\n");
return -1;
} else {
printf("Audio test started!\n");
}
}
return 0;
}
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