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/*
** Copyright 2010, The Android Open-Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef _AUDIO_H_
#define _AUDIO_H_
struct pcm;
#define PCM_OUT 0x00000000
#define PCM_IN 0x10000000
#define PCM_STEREO 0x00000000
#define PCM_MONO 0x01000000
#define PCM_44100HZ 0x00000000
#define PCM_48000HZ 0x00100000
#define PCM_8000HZ 0x00200000
#define PCM_RATE_MASK 0x00F00000
#define PCM_PERIOD_CNT_MIN 2
#define PCM_PERIOD_CNT_SHIFT 16
#define PCM_PERIOD_CNT_MASK (0xF << PCM_PERIOD_CNT_SHIFT)
#define PCM_PERIOD_SZ_MIN 128
#define PCM_PERIOD_SZ_SHIFT 12
#define PCM_PERIOD_SZ_MASK (0xF << PCM_PERIOD_SZ_SHIFT)
/* Acquire/release a pcm channel.
* Returns non-zero on error
*/
struct pcm *pcm_open(unsigned flags);
int pcm_close(struct pcm *pcm);
int pcm_ready(struct pcm *pcm);
/* Returns a human readable reason for the last error. */
const char *pcm_error(struct pcm *pcm);
/* Returns the buffer size (int bytes) that should be used for pcm_write.
* This will be 1/2 of the actual fifo size.
*/
unsigned pcm_buffer_size(struct pcm *pcm);
/* Write data to the fifo.
* Will start playback on the first write or on a write that
* occurs after a fifo underrun.
*/
int pcm_write(struct pcm *pcm, void *data, unsigned count);
int pcm_read(struct pcm *pcm, void *data, unsigned count);
struct mixer;
struct mixer_ctl;
struct mixer *mixer_open(void);
void mixer_close(struct mixer *mixer);
void mixer_dump(struct mixer *mixer);
struct mixer_ctl *mixer_get_control(struct mixer *mixer,
const char *name, unsigned index);
struct mixer_ctl *mixer_get_nth_control(struct mixer *mixer, unsigned n);
int mixer_ctl_set(struct mixer_ctl *ctl, unsigned percent);
int mixer_ctl_select(struct mixer_ctl *ctl, const char *value);
void mixer_ctl_print(struct mixer_ctl *ctl);
#endif
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