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Sourcecode: alsa-driver version File versions

usb_stream.h

/*
 * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
 *
 * 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.
 */

#define USB_STREAM_INTERFACE_VERSION 2

#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
      _IOW('H', 0x90, struct usb_stream_config)

struct usb_stream_packet {
      unsigned offset;
      unsigned length;
};


struct usb_stream_config {
      unsigned version;
      unsigned sample_rate;
      unsigned period_frames;
      unsigned frame_size;
};

struct usb_stream {
      struct usb_stream_config cfg;
      unsigned read_size;
      unsigned write_size;

      int period_size;

      unsigned state;

      int idle_insize;
      int idle_outsize;
      int sync_packet;
      unsigned insize_done;
      unsigned periods_done;
      unsigned periods_polled;

      struct usb_stream_packet outpacket[2];
      unsigned           inpackets;
      unsigned           inpacket_head;
      unsigned           inpacket_split;
      unsigned           inpacket_split_at;
      unsigned           next_inpacket_split;
      unsigned           next_inpacket_split_at;
      struct usb_stream_packet inpacket[0];
};

enum usb_stream_state {
      usb_stream_invalid,
      usb_stream_stopped,
      usb_stream_sync0,
      usb_stream_sync1,
      usb_stream_ready,
      usb_stream_running,
      usb_stream_xrun,
};

#if __KERNEL__

#define USB_STREAM_NURBS 4
#define USB_STREAM_URBDEPTH 4

struct usb_stream_kernel {
      struct usb_stream *s;

      void *write_page;

      unsigned n_o_ps;

      struct urb *inurb[USB_STREAM_NURBS];
      struct urb *idle_inurb;
      struct urb *completed_inurb;
      struct urb *outurb[USB_STREAM_NURBS];
      struct urb *idle_outurb;
      struct urb *completed_outurb;
      struct urb *i_urb;

      int iso_frame_balance;

      wait_queue_head_t sleep;

      unsigned out_phase;
      unsigned out_phase_peeked;
      unsigned freqn;
};

struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
                          struct usb_device *dev,
                          unsigned in_endpoint, unsigned out_endpoint,
                          unsigned sample_rate, unsigned use_packsize,
                          unsigned period_frames, unsigned frame_size);
void usb_stream_free(struct usb_stream_kernel *);
int usb_stream_start(struct usb_stream_kernel *);
void usb_stream_stop(struct usb_stream_kernel *);


#endif

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