194 lines
6.2 KiB
C
194 lines
6.2 KiB
C
/*
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** Copyright 2010, The Android Open-Source Project
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** Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#ifndef _AUDIO_H_
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#define _AUDIO_H_
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#include <sound/asound.h>
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#define PCM_ERROR_MAX 128
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struct pcm {
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int fd;
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int timer_fd;
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unsigned rate;
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unsigned channels;
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unsigned flags;
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unsigned format;
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unsigned running:1;
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int underruns;
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unsigned buffer_size;
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unsigned period_size;
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unsigned period_cnt;
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char error[PCM_ERROR_MAX];
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struct snd_pcm_hw_params *hw_p;
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struct snd_pcm_sw_params *sw_p;
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struct snd_pcm_sync_ptr *sync_ptr;
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struct snd_pcm_channel_info ch[2];
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void *addr;
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int card_no;
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int device_no;
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int start;
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};
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#define FORMAT(v) SNDRV_PCM_FORMAT_##v
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#define PCM_OUT 0x00000000
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#define PCM_IN 0x10000000
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#define PCM_STEREO 0x00000000
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#define PCM_MONO 0x01000000
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#define PCM_QUAD 0x02000000
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#define PCM_5POINT1 0x04000000
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#define PCM_7POINT1 0x08000000
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#define PCM_44100HZ 0x00000000
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#define PCM_48000HZ 0x00100000
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#define PCM_8000HZ 0x00200000
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#define PCM_RATE_MASK 0x00F00000
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#define PCM_MMAP 0x00010000
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#define PCM_NMMAP 0x00000000
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#define DEBUG_ON 0x00000001
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#define DEBUG_OFF 0x00000000
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#define PCM_PERIOD_CNT_MIN 2
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#define PCM_PERIOD_CNT_SHIFT 16
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#define PCM_PERIOD_CNT_MASK (0xF << PCM_PERIOD_CNT_SHIFT)
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#define PCM_PERIOD_SZ_MIN 128
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#define PCM_PERIOD_SZ_SHIFT 12
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#define PCM_PERIOD_SZ_MASK (0xF << PCM_PERIOD_SZ_SHIFT)
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#define TIMEOUT_INFINITE -1
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/* Acquire/release a pcm channel.
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* Returns non-zero on error
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*/
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struct mixer_ctl {
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struct mixer *mixer;
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struct snd_ctl_elem_info *info;
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char **ename;
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};
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#define __snd_alloca(ptr,type) do { *ptr = (type *) alloca(sizeof(type)); memset(*ptr, 0, sizeof(type)); } while (0)
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#define snd_ctl_elem_id_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_id)
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#define snd_ctl_card_info_alloca(ptr) __snd_alloca(ptr, snd_ctl_card_info)
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#define snd_ctl_event_alloca(ptr) __snd_alloca(ptr, snd_ctl_event)
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#define snd_ctl_elem_list_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_list)
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#define snd_ctl_elem_info_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_info)
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#define snd_ctl_elem_value_alloca(ptr) __snd_alloca(ptr, snd_ctl_elem_value)
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enum snd_pcm_stream_t {
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/** Playback stream */
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SND_PCM_STREAM_PLAYBACK = 0,
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/** Capture stream */
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SND_PCM_STREAM_CAPTURE,
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SND_PCM_STREAM_LAST = SND_PCM_STREAM_CAPTURE
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};
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enum _snd_ctl_elem_iface {
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/** Card level */
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SND_CTL_ELEM_IFACE_CARD = 0,
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/** Hardware dependent device */
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SND_CTL_ELEM_IFACE_HWDEP,
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/** Mixer */
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SND_CTL_ELEM_IFACE_MIXER,
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/** PCM */
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SND_CTL_ELEM_IFACE_PCM,
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/** RawMidi */
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SND_CTL_ELEM_IFACE_RAWMIDI,
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/** Timer */
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SND_CTL_ELEM_IFACE_TIMER,
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/** Sequencer */
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SND_CTL_ELEM_IFACE_SEQUENCER,
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SND_CTL_ELEM_IFACE_LAST = SND_CTL_ELEM_IFACE_SEQUENCER
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};
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struct mixer {
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int fd;
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struct snd_ctl_elem_info *info;
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struct mixer_ctl *ctl;
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unsigned count;
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};
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int get_format(const char* name);
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const char *get_format_name(int format);
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const char *get_format_desc(int format);
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struct pcm *pcm_open(unsigned flags, char *device);
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int pcm_close(struct pcm *pcm);
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int pcm_ready(struct pcm *pcm);
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int mmap_buffer(struct pcm *pcm);
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u_int8_t *dst_address(struct pcm *pcm);
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int sync_ptr(struct pcm *pcm);
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void param_init(struct snd_pcm_hw_params *p);
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void param_set_mask(struct snd_pcm_hw_params *p, int n, unsigned bit);
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void param_set_min(struct snd_pcm_hw_params *p, int n, unsigned val);
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void param_set_int(struct snd_pcm_hw_params *p, int n, unsigned val);
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void param_set_max(struct snd_pcm_hw_params *p, int n, unsigned val);
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int param_set_hw_refine(struct pcm *pcm, struct snd_pcm_hw_params *params);
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int param_set_hw_params(struct pcm *pcm, struct snd_pcm_hw_params *params);
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int param_set_sw_params(struct pcm *pcm, struct snd_pcm_sw_params *sparams);
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int get_compressed_format(const char *format);
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void param_dump(struct snd_pcm_hw_params *p);
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int pcm_prepare(struct pcm *pcm);
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long pcm_avail(struct pcm *pcm);
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int pcm_set_channel_map(struct pcm *pcm, struct mixer *mixer,
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int max_channels, char *chmap);
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/* Returns a human readable reason for the last error. */
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const char *pcm_error(struct pcm *pcm);
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/* Returns the buffer size (int bytes) that should be used for pcm_write.
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* This will be 1/2 of the actual fifo size.
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*/
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int pcm_buffer_size(struct snd_pcm_hw_params *params);
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int pcm_period_size(struct snd_pcm_hw_params *params);
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/* Write data to the fifo.
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* Will start playback on the first write or on a write that
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* occurs after a fifo underrun.
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*/
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int pcm_write(struct pcm *pcm, void *data, unsigned count);
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int pcm_read(struct pcm *pcm, void *data, unsigned count);
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struct mixer;
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struct mixer_ctl;
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struct mixer *mixer_open(const char *device);
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void mixer_close(struct mixer *mixer);
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void mixer_dump(struct mixer *mixer);
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struct mixer_ctl *mixer_get_control(struct mixer *mixer,
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const char *name, unsigned index);
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struct mixer_ctl *mixer_get_nth_control(struct mixer *mixer, unsigned n);
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int mixer_ctl_set(struct mixer_ctl *ctl, unsigned percent);
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int mixer_ctl_select(struct mixer_ctl *ctl, const char *value);
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void mixer_ctl_get(struct mixer_ctl *ctl, unsigned *value);
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int mixer_ctl_set_value(struct mixer_ctl *ctl, int count, char ** argv);
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unsigned int mixer_ctl_get_num_values(struct mixer_ctl *ctl);
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struct mixer_ctl *mixer_get_ctl_by_name(struct mixer *mixer, const char *name);
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void mixer_ctl_update(struct mixer_ctl *ctl);
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int mixer_ctl_get_array(struct mixer_ctl *ctl, void *array, size_t count);
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#define MAX_NUM_CODECS 32
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#endif
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