122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/*
|
|
* Copyright 2007 The Android Open Source Project
|
|
*
|
|
* Audio output device.
|
|
*/
|
|
#include "Common.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <alsa/asoundlib.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/ioctl.h>
|
|
#include <linux/input.h>
|
|
|
|
|
|
/*
|
|
* Input event device state.
|
|
*/
|
|
typedef struct AudioState {
|
|
snd_pcm_t *handle;
|
|
} AudioState;
|
|
|
|
/*
|
|
* Set some stuff up.
|
|
*/
|
|
static int configureInitialState(const char* pathName, AudioState* audioState)
|
|
{
|
|
#if BUILD_SIM_WITHOUT_AUDIO
|
|
return 0;
|
|
#else
|
|
audioState->handle = NULL;
|
|
|
|
snd_pcm_open(&audioState->handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
|
|
|
|
if (audioState->handle) {
|
|
snd_pcm_hw_params_t *params;
|
|
snd_pcm_hw_params_malloc(¶ms);
|
|
snd_pcm_hw_params_any(audioState->handle, params);
|
|
snd_pcm_hw_params_set_access(audioState->handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
|
|
snd_pcm_hw_params_set_format(audioState->handle, params, SND_PCM_FORMAT_S16_LE);
|
|
unsigned int rate = 44100;
|
|
snd_pcm_hw_params_set_rate_near(audioState->handle, params, &rate, NULL);
|
|
snd_pcm_hw_params_set_channels(audioState->handle, params, 2);
|
|
snd_pcm_hw_params(audioState->handle, params);
|
|
snd_pcm_hw_params_free(params);
|
|
} else {
|
|
wsLog("Couldn't open audio hardware, faking it\n");
|
|
}
|
|
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Write audio data.
|
|
*/
|
|
static ssize_t writeAudio(FakeDev* dev, int fd, const void* buf, size_t count)
|
|
{
|
|
#if BUILD_SIM_WITHOUT_AUDIO
|
|
return 0;
|
|
#else
|
|
AudioState *state = (AudioState*)dev->state;
|
|
if (state->handle != NULL) {
|
|
snd_pcm_writei(state->handle, buf, count / 4);
|
|
return count;
|
|
}
|
|
|
|
// fake timing
|
|
usleep(count * 10000 / (441 * 4));
|
|
return count;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Handle event ioctls.
|
|
*/
|
|
static int ioctlAudio(FakeDev* dev, int fd, int request, void* argp)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Free up our state before closing down the fake descriptor.
|
|
*/
|
|
static int closeAudio(FakeDev* dev, int fd)
|
|
{
|
|
#if BUILD_SIM_WITHOUT_AUDIO
|
|
return 0;
|
|
#else
|
|
AudioState *state = (AudioState*)dev->state;
|
|
snd_pcm_close(state->handle);
|
|
free(state);
|
|
dev->state = NULL;
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Open an audio output device.
|
|
*/
|
|
FakeDev* wsOpenDevAudio(const char* pathName, int flags)
|
|
{
|
|
FakeDev* newDev = wsCreateFakeDev(pathName);
|
|
if (newDev != NULL) {
|
|
newDev->write = writeAudio;
|
|
newDev->ioctl = ioctlAudio;
|
|
newDev->close = closeAudio;
|
|
|
|
AudioState* eventState = calloc(1, sizeof(AudioState));
|
|
|
|
if (configureInitialState(pathName, eventState) != 0) {
|
|
free(eventState);
|
|
return NULL;
|
|
}
|
|
newDev->state = eventState;
|
|
}
|
|
|
|
return newDev;
|
|
}
|