mirror of
https://github.com/alsa-project/alsa-lib.git
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306 lines
10 KiB
C
306 lines
10 KiB
C
/*
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* PCM - Direct Stream Mixing
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* Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "pcm_local.h"
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#define DIRECT_IPC_SEMS 1
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#define DIRECT_IPC_SEM_CLIENT 0
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typedef void (mix_areas_t)(unsigned int size,
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volatile void *dst, void *src,
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volatile signed int *sum, size_t dst_step,
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size_t src_step, size_t sum_step);
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typedef void (mix_areas_16_t)(unsigned int size,
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volatile signed short *dst, signed short *src,
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volatile signed int *sum, size_t dst_step,
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size_t src_step, size_t sum_step);
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typedef void (mix_areas_32_t)(unsigned int size,
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volatile signed int *dst, signed int *src,
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volatile signed int *sum, size_t dst_step,
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size_t src_step, size_t sum_step);
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typedef void (mix_areas_24_t)(unsigned int size,
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volatile unsigned char *dst, unsigned char *src,
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volatile signed int *sum, size_t dst_step,
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size_t src_step, size_t sum_step);
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typedef void (mix_areas_u8_t)(unsigned int size,
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volatile unsigned char *dst, unsigned char *src,
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volatile signed int *sum, size_t dst_step,
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size_t src_step, size_t sum_step);
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struct slave_params {
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snd_pcm_format_t format;
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int rate;
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int channels;
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int period_time;
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int buffer_time;
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snd_pcm_sframes_t period_size;
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snd_pcm_sframes_t buffer_size;
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unsigned int periods;
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};
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/* shared among direct plugin clients - be careful to be 32/64bit compatible! */
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typedef struct {
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unsigned int magic; /* magic number */
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char socket_name[256]; /* name of communication socket */
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snd_pcm_type_t type; /* PCM type (currently only hw) */
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int use_server;
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struct {
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unsigned int format;
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snd_interval_t rate;
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snd_interval_t buffer_size;
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snd_interval_t buffer_time;
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snd_interval_t period_size;
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snd_interval_t period_time;
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snd_interval_t periods;
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} hw;
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struct {
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/* copied to slave PCMs */
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snd_pcm_access_t access;
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snd_pcm_format_t format;
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snd_pcm_subformat_t subformat;
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unsigned int channels;
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unsigned int rate;
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unsigned int period_size;
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unsigned int period_time;
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snd_interval_t periods;
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unsigned int monotonic;
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snd_pcm_tstamp_t tstamp_mode;
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unsigned int period_step;
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unsigned int sleep_min; /* not used */
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unsigned int avail_min;
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unsigned int start_threshold;
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unsigned int stop_threshold;
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unsigned int silence_threshold;
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unsigned int silence_size;
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unsigned int xfer_align; /* not used */
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unsigned long long boundary;
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unsigned int info;
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unsigned int msbits;
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unsigned int rate_num;
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unsigned int rate_den;
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unsigned int hw_flags;
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unsigned int fifo_size;
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unsigned int buffer_size;
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snd_interval_t buffer_time;
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unsigned int sample_bits;
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unsigned int frame_bits;
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} s;
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union {
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struct {
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unsigned long long chn_mask;
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} dshare;
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} u;
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} snd_pcm_direct_share_t;
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typedef struct snd_pcm_direct snd_pcm_direct_t;
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struct snd_pcm_direct {
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snd_pcm_type_t type; /* type (dmix, dsnoop, dshare) */
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key_t ipc_key; /* IPC key for semaphore and memory */
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mode_t ipc_perm; /* IPC socket permissions */
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int ipc_gid; /* IPC socket gid */
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int semid; /* IPC global semaphore identification */
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int shmid; /* IPC global shared memory identification */
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snd_pcm_direct_share_t *shmptr; /* pointer to shared memory area */
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snd_pcm_t *spcm; /* slave PCM handle */
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snd_pcm_uframes_t appl_ptr;
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snd_pcm_uframes_t last_appl_ptr;
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snd_pcm_uframes_t hw_ptr;
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snd_pcm_uframes_t avail_max;
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snd_pcm_uframes_t slave_appl_ptr;
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snd_pcm_uframes_t slave_hw_ptr;
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snd_pcm_uframes_t slave_period_size;
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snd_pcm_uframes_t slave_buffer_size;
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snd_pcm_uframes_t slave_boundary;
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int (*sync_ptr)(snd_pcm_t *pcm);
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snd_pcm_state_t state;
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snd_htimestamp_t trigger_tstamp;
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int server, client;
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int comm_fd; /* communication file descriptor (socket) */
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int hw_fd; /* hardware file descriptor */
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struct pollfd timer_fd;
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int poll_fd;
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int tread;
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int timer_need_poll;
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unsigned int timer_event_suspend;
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unsigned int timer_event_resume;
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int server_fd;
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pid_t server_pid;
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snd_timer_t *timer; /* timer used as poll_fd */
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int interleaved; /* we have interleaved buffer */
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int slowptr; /* use slow but more precise ptr updates */
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int max_periods; /* max periods (-1 = fixed periods, 0 = max buffer size) */
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unsigned int channels; /* client's channels */
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unsigned int *bindings;
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union {
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struct {
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int shmid_sum; /* IPC global sum ring buffer memory identification */
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signed int *sum_buffer; /* shared sum buffer */
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mix_areas_16_t *mix_areas_16;
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mix_areas_32_t *mix_areas_32;
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mix_areas_24_t *mix_areas_24;
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mix_areas_u8_t *mix_areas_u8;
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mix_areas_16_t *remix_areas_16;
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mix_areas_32_t *remix_areas_32;
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mix_areas_24_t *remix_areas_24;
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mix_areas_u8_t *remix_areas_u8;
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} dmix;
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struct {
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} dsnoop;
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struct {
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unsigned long long chn_mask;
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} dshare;
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} u;
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void (*server_free)(snd_pcm_direct_t *direct);
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};
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/* make local functions really local */
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#define snd_pcm_direct_semaphore_create_or_connect \
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snd1_pcm_direct_semaphore_create_or_connect
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#define snd_pcm_direct_shm_create_or_connect \
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snd1_pcm_direct_shm_create_or_connect
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#define snd_pcm_direct_shm_discard \
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snd1_pcm_direct_shm_discard
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#define snd_pcm_direct_server_create \
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snd1_pcm_direct_server_create
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#define snd_pcm_direct_server_discard \
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snd1_pcm_direct_server_discard
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#define snd_pcm_direct_client_connect \
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snd1_pcm_direct_client_connect
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#define snd_pcm_direct_client_discard \
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snd1_pcm_direct_client_discard
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#define snd_pcm_direct_initialize_slave \
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snd1_pcm_direct_initialize_slave
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#define snd_pcm_direct_initialize_secondary_slave \
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snd1_pcm_direct_initialize_secondary_slave
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#define snd_pcm_direct_initialize_poll_fd \
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snd1_pcm_direct_initialize_poll_fd
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#define snd_pcm_direct_check_interleave \
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snd1_pcm_direct_check_interleave
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#define snd_pcm_direct_parse_bindings \
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snd1_pcm_direct_parse_bindings
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#define snd_pcm_direct_nonblock \
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snd1_pcm_direct_nonblock
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#define snd_pcm_direct_async \
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snd1_pcm_direct_async
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#define snd_pcm_direct_poll_revents \
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snd1_pcm_direct_poll_revents
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#define snd_pcm_direct_info \
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snd1_pcm_direct_info
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#define snd_pcm_direct_hw_refine \
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snd1_pcm_direct_hw_refine
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#define snd_pcm_direct_hw_params \
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snd1_pcm_direct_hw_params
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#define snd_pcm_direct_hw_free \
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snd1_pcm_direct_hw_free
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#define snd_pcm_direct_sw_params \
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snd1_pcm_direct_sw_params
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#define snd_pcm_direct_channel_info \
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snd1_pcm_direct_channel_info
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#define snd_pcm_direct_mmap \
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snd1_pcm_direct_mmap
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#define snd_pcm_direct_munmap \
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snd1_pcm_direct_munmap
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#define snd_pcm_direct_resume \
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snd1_pcm_direct_resume
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#define snd_pcm_direct_timer_stop \
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snd1_pcm_direct_timer_stop
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#define snd_pcm_direct_clear_timer_queue \
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snd1_pcm_direct_clear_timer_queue
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#define snd_pcm_direct_set_timer_params \
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snd1_pcm_direct_set_timer_params
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#define snd_pcm_direct_open_secondary_client \
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snd1_pcm_direct_open_secondary_client
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#define snd_pcm_direct_parse_open_conf \
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snd1_pcm_direct_parse_open_conf
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int snd_pcm_direct_semaphore_create_or_connect(snd_pcm_direct_t *dmix);
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static inline int snd_pcm_direct_semaphore_discard(snd_pcm_direct_t *dmix)
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{
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if (dmix->semid >= 0) {
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if (semctl(dmix->semid, 0, IPC_RMID, NULL) < 0)
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return -errno;
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dmix->semid = -1;
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}
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return 0;
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}
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static inline int snd_pcm_direct_semaphore_down(snd_pcm_direct_t *dmix, int sem_num)
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{
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struct sembuf op[2] = { { sem_num, 0, 0 }, { sem_num, 1, SEM_UNDO } };
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return semop(dmix->semid, op, 2);
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}
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static inline int snd_pcm_direct_semaphore_up(snd_pcm_direct_t *dmix, int sem_num)
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{
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struct sembuf op = { sem_num, -1, SEM_UNDO | IPC_NOWAIT };
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return semop(dmix->semid, &op, 1);
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}
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int snd_pcm_direct_shm_create_or_connect(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_shm_discard(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_server_create(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_server_discard(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_client_connect(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_client_discard(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_initialize_slave(snd_pcm_direct_t *dmix, snd_pcm_t *spcm, struct slave_params *params);
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int snd_pcm_direct_initialize_secondary_slave(snd_pcm_direct_t *dmix, snd_pcm_t *spcm, struct slave_params *params);
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int snd_pcm_direct_initialize_poll_fd(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_check_interleave(snd_pcm_direct_t *dmix, snd_pcm_t *pcm);
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int snd_pcm_direct_parse_bindings(snd_pcm_direct_t *dmix,
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struct slave_params *params,
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snd_config_t *cfg);
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int snd_pcm_direct_nonblock(snd_pcm_t *pcm, int nonblock);
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int snd_pcm_direct_async(snd_pcm_t *pcm, int sig, pid_t pid);
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int snd_pcm_direct_poll_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
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int snd_pcm_direct_info(snd_pcm_t *pcm, snd_pcm_info_t * info);
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int snd_pcm_direct_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
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int snd_pcm_direct_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params);
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int snd_pcm_direct_hw_free(snd_pcm_t *pcm);
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int snd_pcm_direct_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t * params);
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int snd_pcm_direct_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info);
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int snd_pcm_direct_mmap(snd_pcm_t *pcm);
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int snd_pcm_direct_munmap(snd_pcm_t *pcm);
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int snd_pcm_direct_resume(snd_pcm_t *pcm);
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int snd_pcm_direct_timer_stop(snd_pcm_direct_t *dmix);
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void snd_pcm_direct_clear_timer_queue(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_set_timer_params(snd_pcm_direct_t *dmix);
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int snd_pcm_direct_open_secondary_client(snd_pcm_t **spcmp, snd_pcm_direct_t *dmix, const char *client_name);
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int snd_timer_async(snd_timer_t *timer, int sig, pid_t pid);
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struct timespec snd_pcm_hw_fast_tstamp(snd_pcm_t *pcm);
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struct snd_pcm_direct_open_conf {
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key_t ipc_key;
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mode_t ipc_perm;
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int ipc_gid;
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int slowptr;
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int max_periods;
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snd_config_t *slave;
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snd_config_t *bindings;
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};
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int snd_pcm_direct_parse_open_conf(snd_config_t *root, snd_config_t *conf, int stream, struct snd_pcm_direct_open_conf *rec);
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