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midi/oss_midi_mapper.c

MIDI device mapper

Description

This code is used to bind applications using /dev/mixer to the actual MIDI input and output ports.

This file is part of Open Sound System.

Copyright (C) 4Front Technologies 1996-2008.

This this source file is released under GPL v2 license (no other versions). See the COPYING file included in the main directory of this source distribution for the license terms and conditions. 


#include "oss_config.h"
#include "midi_core.h"

extern oss_mutex_t midi_mutex;

void
midi_mapper_init (oss_device_t * osdev)
{
}

void
midi_mapper_uninit (void)
{
}

int
midi_mapper_autobind (int client_dev, int mode)
{
  int dev;
  oss_midi_client_t *client = oss_midi_clients[client_dev];

  cmn_err (CE_CONT, "MIDI autobind %d\n", client_dev);

  for (dev = 0; dev < num_mididevs; dev++)
    {
      int err;

      if (midi_devs[dev]->open_mode)	/* Busy */
	continue;

      if ((mode & OPEN_WRITE) && !(midi_devs[dev]->flags & MFLAG_OUTPUT))
	continue;

      if ((mode == OPEN_READ) && !(midi_devs[dev]->flags & MFLAG_INPUT))
	continue;

      if ((err = midi_devs[dev]->d->open (dev, client->open_mode,
					  oss_midi_input_byte,
					  oss_midi_input_buf,
					  oss_midi_output_intr)) < 0)
	{
	  /* The device seems to think it's busy */
	  continue;
	}

      if (midi_devs[dev]->open_mode == 0)	/* Not busy */
	{

	  midi_devs[dev]->open_mode = mode;
	  client->mididev = midi_devs[dev];

	  if (mode & OPEN_READ)
	    {
	      client->mididev->in_queue =
		midi_queue_alloc (client->mididev->osdev, "qread");
	      if (client->mididev->in_queue == NULL)
		{
		  cmn_err (CE_WARN,
			   "Failed to allocate MIDI input queue(2)\n");
		  midi_devs[dev]->d->close (dev, mode);
		  midi_devs[dev]->open_mode = 0;
		  return OSS_ENOMEM;

		}
	    }

	  if (mode & OPEN_WRITE)
	    {
	      client->mididev->out_queue =
		midi_queue_alloc (client->mididev->osdev, "qwrite");
	      if (client->mididev->out_queue == NULL)
		{
		  cmn_err (CE_WARN,
			   "Failed to allocate MIDI output queue(2)\n");
		  midi_devs[dev]->d->close (dev, mode);
		  midi_devs[dev]->open_mode = 0;
		  return OSS_ENOMEM;

		}
	    }

	  oss_midi_set_defaults (client->mididev);

	  cmn_err (CE_CONT, "Bound to %d/%s\n", dev, midi_devs[dev]->name);
	  return dev;

	}
    }

  return OSS_EBUSY;
}
Copyright (C) 4Front Technologies, 2007. All rights reserved.

Back to index OSS web site

Copyright (C) 4Front Technologies, 2007. All rights reserved.
Back to index OSS web site