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alsa_driver.h

/*
    Copyright (C) 2001 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: alsa_driver.h,v 1.11 2005/03/16 21:19:31 essej Exp $
*/

#ifndef __jack_alsa_driver_h__
#define __jack_alsa_driver_h__

#include <alsa/asoundlib.h>
#include <jack/bitset.h>

#if __BYTE_ORDER == __LITTLE_ENDIAN
      #define     SND_PCM_FORMAT_S24_3 SND_PCM_FORMAT_S24_3LE
#elif __BYTE_ORDER == __BIG_ENDIAN
      #define     SND_PCM_FORMAT_S24_3 SND_PCM_FORMAT_S24_3BE
#endif



#include <jack/types.h>
#include <jack/hardware.h>
#include <jack/driver.h>
#include <jack/memops.h>
#include <jack/jack.h>

typedef void (*ReadCopyFunction)  (jack_default_audio_sample_t *dst, char *src,
                           unsigned long src_bytes,
                           unsigned long src_skip_bytes);
typedef void (*WriteCopyFunction) (char *dst, jack_default_audio_sample_t *src,
                           unsigned long src_bytes,
                           unsigned long dst_skip_bytes,
                           dither_state_t *state);
typedef void (*CopyCopyFunction)  (char *dst, char *src,
                           unsigned long src_bytes,
                           unsigned long dst_skip_bytes,
                           unsigned long src_skip_byte);

typedef struct _alsa_driver {

    JACK_DRIVER_NT_DECL

    int                           poll_timeout;
    jack_time_t                   poll_last;
    jack_time_t                   poll_next;
    char                        **playback_addr;
    char                        **capture_addr;
    const snd_pcm_channel_area_t *capture_areas;
    const snd_pcm_channel_area_t *playback_areas;
    struct pollfd                *pfd;
    unsigned int                  playback_nfds;
    unsigned int                  capture_nfds;
    unsigned long                 interleave_unit;
    unsigned long                 capture_interleave_skip;
    unsigned long                 playback_interleave_skip;
    channel_t                     max_nchannels;
    channel_t                     user_nchannels;
    channel_t                     playback_nchannels;
    channel_t                     capture_nchannels;
    unsigned long                 playback_sample_bytes;
    unsigned long                 capture_sample_bytes;

    jack_nframes_t                frame_rate;
    jack_nframes_t                frames_per_cycle;
    jack_nframes_t                capture_frame_latency;
    jack_nframes_t                playback_frame_latency;

    unsigned long                *silent;
    char                         *alsa_name_playback;
    char                         *alsa_name_capture;
    char                         *alsa_driver;
    bitset_t                    channels_not_done;
    bitset_t                    channels_done;
    snd_pcm_format_t              playback_sample_format;
    snd_pcm_format_t              capture_sample_format;
    float                         max_sample_val;
    unsigned long                 user_nperiods;
    unsigned int                  playback_nperiods;
    unsigned int                  capture_nperiods;
    unsigned long                 last_mask;
    snd_ctl_t                    *ctl_handle;
    snd_pcm_t                    *playback_handle;
    snd_pcm_t                    *capture_handle;
    snd_pcm_hw_params_t          *playback_hw_params;
    snd_pcm_sw_params_t          *playback_sw_params;
    snd_pcm_hw_params_t          *capture_hw_params;
    snd_pcm_sw_params_t          *capture_sw_params;
    jack_hardware_t              *hw;  
    ClockSyncStatus              *clock_sync_data;
    jack_client_t                *client;
    JSList                       *capture_ports;
    JSList                       *playback_ports;
    JSList                       *monitor_ports;

    unsigned long input_monitor_mask;

    char   soft_mode : 1;
    char   hw_monitoring : 1;
    char   hw_metering : 1;
    char   all_monitor_in : 1;
    char   capture_and_playback_not_synced : 1;
    char   playback_interleaved : 1;
    char   capture_interleaved : 1;
    char   with_monitor_ports : 1;

    ReadCopyFunction read_via_copy;
    WriteCopyFunction write_via_copy;
    CopyCopyFunction channel_copy;

    int             dither;
    dither_state_t *dither_state;

    SampleClockMode clock_mode;
    JSList *clock_sync_listeners;
    pthread_mutex_t clock_sync_lock;
    unsigned long next_clock_sync_listener_id;
    char has_clock_sync_reporting : 1;
    char has_hw_monitoring : 1;
    char has_hw_metering : 1;

    int running;
    int run;

    int poll_late;
    int xrun_count;
    int process_count;

} alsa_driver_t;

static inline void 
alsa_driver_mark_channel_done (alsa_driver_t *driver, channel_t chn) {
      bitset_remove (driver->channels_not_done, chn);
      driver->silent[chn] = 0;
}

static inline void 
alsa_driver_silence_on_channel (alsa_driver_t *driver, channel_t chn,
                        jack_nframes_t nframes) {
      if (driver->playback_interleaved) {
            memset_interleave 
                  (driver->playback_addr[chn],
                   0, nframes * driver->playback_sample_bytes,
                   driver->interleave_unit,
                   driver->playback_interleave_skip);
      } else {
            memset (driver->playback_addr[chn], 0,
                  nframes * driver->playback_sample_bytes);
      }
      alsa_driver_mark_channel_done (driver,chn);
}

static inline void 
alsa_driver_silence_on_channel_no_mark (alsa_driver_t *driver, channel_t chn,
                              jack_nframes_t nframes) {
      if (driver->playback_interleaved) {
            memset_interleave 
                  (driver->playback_addr[chn],
                   0, nframes * driver->playback_sample_bytes,
                   driver->interleave_unit,
                   driver->playback_interleave_skip);
      } else {
            memset (driver->playback_addr[chn], 0,
                  nframes * driver->playback_sample_bytes);
      }
}

static inline void 
alsa_driver_read_from_channel (alsa_driver_t *driver,
                         channel_t channel,
                         jack_default_audio_sample_t *buf,
                         jack_nframes_t nsamples)
{
      driver->read_via_copy (buf, 
                         driver->capture_addr[channel],
                         nsamples, 
                         driver->capture_interleave_skip);
}

static inline void 
alsa_driver_write_to_channel (alsa_driver_t *driver,
                        channel_t channel, 
                        jack_default_audio_sample_t *buf, 
                        jack_nframes_t nsamples)
{
      driver->write_via_copy (driver->playback_addr[channel],
                        buf, 
                        nsamples, 
                        driver->playback_interleave_skip,
                        driver->dither_state+channel);
      alsa_driver_mark_channel_done (driver, channel);
}

static inline void 
alsa_driver_copy_channel (alsa_driver_t *driver, 
                    channel_t input_channel, 
                    channel_t output_channel,
                    jack_nframes_t nsamples) {

      driver->channel_copy (driver->playback_addr[output_channel],
                        driver->capture_addr[input_channel],
                        nsamples * driver->playback_sample_bytes,
                        driver->playback_interleave_skip,
                        driver->capture_interleave_skip);
      alsa_driver_mark_channel_done (driver, output_channel);
}

void  alsa_driver_silence_untouched_channels (alsa_driver_t *driver,
                                    jack_nframes_t nframes);
void  alsa_driver_set_clock_sync_status (alsa_driver_t *driver, channel_t chn,
                               ClockSyncStatus status);
int   alsa_driver_listen_for_clock_sync_status (alsa_driver_t *,
                                    ClockSyncListenerFunction,
                                    void *arg);
int   alsa_driver_stop_listen_for_clock_sync_status (alsa_driver_t *,
                                         unsigned int);
void  alsa_driver_clock_sync_notify (alsa_driver_t *, channel_t chn,
                             ClockSyncStatus);

#endif /* __jack_alsa_driver_h__ */

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