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* A simple PCM loopback utility
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* Copyright (c) 2010 by Jaroslav Kysela <perex@perex.cz>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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#ifdef HAVE_SAMPLERATE_H
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#define USE_SAMPLERATE
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#include <samplerate.h>
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SRC_SINC_BEST_QUALITY = 0,
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SRC_SINC_MEDIUM_QUALITY = 1,
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SRC_ZERO_ORDER_HOLD = 3,
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#define FILE_PWRITE "/tmp/alsaloop.praw"
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#define FILE_CWRITE "/tmp/alsaloop.craw"
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#define WORKAROUND_SERIALOPEN (1<<0)
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typedef enum _sync_type {
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SYNC_TYPE_SIMPLE, /* add or remove samples */
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SYNC_TYPE_CAPTRATESHIFT,
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SYNC_TYPE_PLAYRATESHIFT,
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SYNC_TYPE_AUTO, /* order: CAPTRATESHIFT, PLAYRATESHIFT, */
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/* SAMPLERATE, SIMPLE */
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SYNC_TYPE_LAST = SYNC_TYPE_AUTO
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typedef enum _slave_type {
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SLAVE_TYPE_LAST = SLAVE_TYPE_OFF
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struct loopback_control {
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snd_ctl_elem_id_t *id;
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snd_ctl_elem_info_t *info;
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snd_ctl_elem_value_t *value;
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struct loopback_mixer {
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struct loopback_control src;
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struct loopback_control dst;
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struct loopback_mixer *next;
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struct loopback_ossmixer {
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struct loopback_ossmixer *next;
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struct loopback_handle {
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struct loopback *loopback;
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snd_pcm_access_t access;
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snd_pcm_format_t format;
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unsigned int rate_req;
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unsigned int channels;
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unsigned int buffer_size;
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unsigned int period_size;
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snd_pcm_uframes_t avail_min;
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unsigned int buffer_size_req;
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unsigned int period_size_req;
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unsigned int frame_size;
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unsigned int resample:1; /* do resample */
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unsigned int nblock:1; /* do block (period size) transfers */
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unsigned int xrun_pending:1;
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unsigned int pollfd_count;
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char *buf; /* I/O buffer */
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snd_pcm_uframes_t buf_pos; /* I/O position */
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snd_pcm_uframes_t buf_count; /* filled samples */
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snd_pcm_uframes_t buf_size; /* buffer size in frames */
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snd_pcm_uframes_t buf_over; /* capture buffer overflow */
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snd_pcm_uframes_t max;
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unsigned long long counter;
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unsigned long sync_point; /* in samples */
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snd_pcm_sframes_t last_delay;
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snd_pcm_uframes_t total_queued;
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unsigned int ctl_pollfd_count;
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snd_ctl_elem_value_t *ctl_notify;
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snd_ctl_elem_value_t *ctl_rate_shift;
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snd_ctl_elem_value_t *ctl_active;
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snd_ctl_elem_value_t *ctl_format;
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snd_ctl_elem_value_t *ctl_rate;
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snd_ctl_elem_value_t *ctl_channels;
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struct loopback_handle *capt;
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struct loopback_handle *play;
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snd_pcm_uframes_t latency; /* final latency in frames */
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unsigned int latency_req; /* in frames */
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unsigned int latency_reqtime; /* in us */
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unsigned long loop_time; /* ~0 = unlimited (in seconds) */
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unsigned long long loop_limit; /* ~0 = unlimited (in frames) */
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snd_output_t *output;
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int active_pollfd_count;
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unsigned int linked:1; /* linked streams */
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unsigned int reinit:1;
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unsigned int running:1;
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unsigned int stop_pending:1;
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snd_pcm_uframes_t stop_count;
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sync_type_t sync; /* type of sync */
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int thread; /* thread number */
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snd_pcm_sframes_t pitch_diff;
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snd_pcm_sframes_t pitch_diff_min;
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snd_pcm_sframes_t pitch_diff_max;
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unsigned int total_queued_count;
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snd_timestamp_t tstamp_start;
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snd_timestamp_t tstamp_end;
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unsigned int xrun:1; /* xrun profiling */
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snd_timestamp_t xrun_last_update;
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snd_timestamp_t xrun_last_wake0;
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snd_timestamp_t xrun_last_wake;
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snd_timestamp_t xrun_last_check0;
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snd_timestamp_t xrun_last_check;
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snd_pcm_sframes_t xrun_last_pdelay;
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snd_pcm_sframes_t xrun_last_cdelay;
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snd_pcm_uframes_t xrun_buf_pcount;
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snd_pcm_uframes_t xrun_buf_ccount;
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unsigned int xrun_out_frames;
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long xrun_max_proctime;
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double xrun_max_missing;
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struct loopback_mixer *controls;
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struct loopback_ossmixer *oss_controls;
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unsigned int use_samplerate:1;
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#ifdef USE_SAMPLERATE
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unsigned int src_enable:1;
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int src_converter_type;
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SRC_STATE *src_state;
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unsigned int src_out_frames;
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extern int workarounds;
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extern int use_syslog;
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#define logit(priority, fmt, args...) do { \
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syslog(priority, fmt, ##args); \
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fprintf(stderr, fmt, ##args); \
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int pcmjob_init(struct loopback *loop);
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int pcmjob_done(struct loopback *loop);
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int pcmjob_start(struct loopback *loop);
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int pcmjob_stop(struct loopback *loop);
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int pcmjob_pollfds_init(struct loopback *loop, struct pollfd *fds);
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int pcmjob_pollfds_handle(struct loopback *loop, struct pollfd *fds);
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void pcmjob_state(struct loopback *loop);
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int control_parse_id(const char *str, snd_ctl_elem_id_t *id);
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int control_id_match(snd_ctl_elem_id_t *id1, snd_ctl_elem_id_t *id2);
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int control_init(struct loopback *loop);
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int control_done(struct loopback *loop);
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int control_event(struct loopback_handle *lhandle, snd_ctl_event_t *ev);