usbmidi.c

   1 /*
   2 Calf Box, an open source musical instrument.
   3 Copyright (C) 2010-2013 Krzysztof Foltman
   4
   5 This program is free software: you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation, either version 3 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include "config.h"
  20 #include "config-api.h"
  21 #include "errors.h"
  22 #include "hwcfg.h"
  23 #include "io.h"
  24 #include "meter.h"
  25 #include "midi.h"
  26 #include "recsrc.h"
  27 #include "usbio_impl.h"
  28
  29 #include <unistd.h>
  30
  31 static void midi_transfer_cb(struct libusb_transfer *transfer)
  32 {
  33     struct usbio_transfer *xf = transfer->user_data;
  34     struct cbox_usb_midi_input *umi = xf->user_data;
  35     xf->pending = FALSE;
  36
  37     if (transfer->status == LIBUSB_TRANSFER_CANCELLED)
  38     {
  39         xf->cancel_confirm = 1;
  40         return;
  41     }
  42     if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT || transfer->status == LIBUSB_TRANSFER_ERROR || transfer->status == LIBUSB_TRANSFER_STALL)
  43     {
  44         if (transfer->status != LIBUSB_TRANSFER_TIMED_OUT)
  45             g_warning("USB error on device %03d:%03d: transfer status %d", umi->busdevadr >> 8, umi->busdevadr & 255, transfer->status);
  46         if (umi->uii->no_resubmit)
  47             return;
  48         int res = usbio_transfer_submit(xf);
  49         if (res != 0)
  50             g_warning("Error submitting URB to MIDI endpoint: error code %d", res);
  51         return;
  52     }
  53     if (transfer->status == LIBUSB_TRANSFER_NO_DEVICE)
  54     {
  55         g_debug("No device %03d:%03d, unlinking", umi->busdevadr >> 8, umi->busdevadr & 255);
  56         umi->uii->rt_midi_input_ports = g_list_remove(umi->uii->rt_midi_input_ports, umi);
  57         return;
  58     }
  59
  60     const struct cbox_usb_device_info *udi = umi->devinfo;
  61     if (udi->vid == 0x09e8 && udi->pid == 0x0062)
  62     {
  63         for (int i = 0; i < transfer->actual_length;)
  64         {
  65             uint8_t *data = &transfer->buffer[i];
  66             uint8_t len = data[0] & 15;
  67             if (!len || i + len >= transfer->actual_length)
  68                 break;
  69             cbox_midi_buffer_write_inline(&umi->midi_buffer, 0, data[1], len > 1 ? data[2] : 0, len > 2 ? data[3] : 0);
  70             i += len + 1;
  71         }
  72     }
  73     else
  74     {
  75         for (int i = 0; i + 3 < transfer->actual_length; i += 4)
  76         {
  77             uint8_t *data = &transfer->buffer[i];
  78             if ((data[0] & 15) >= 0x08)
  79             {
  80                 // normalise: note on with vel 0 -> note off
  81                 if ((data[1] & 0xF0) == 0x90 && data[3] == 0)
  82                     cbox_midi_buffer_write_inline(&umi->midi_buffer, 0, data[1] - 0x10, data[2], data[3]);
  83                 else
  84                     cbox_midi_buffer_write_event(&umi->midi_buffer, 0, data + 1, midi_cmd_size(data[1]));
  85             }
  86         }
  87     }
  88     if (umi->uii->no_resubmit)
  89         return;
  90     usbio_transfer_submit(xf);
  91 }
  92
  93 void usbio_start_midi_capture(struct cbox_usb_io_impl *uii)
  94 {
  95     uii->rt_midi_input_ports = g_list_copy(uii->midi_input_ports);
  96     uii->midi_input_port_count = 0;
  97
  98     for(GList *p = uii->rt_midi_input_ports; p; p = p->next)
  99         uii->midi_input_port_count++;
 100     uii->midi_input_port_buffers = calloc(uii->midi_input_port_count, sizeof(struct cbox_midi_buffer *));
 101     uii->midi_input_port_pos = calloc(uii->midi_input_port_count, sizeof(int));
 102     int pn = 0;
 103     for(GList *p = uii->rt_midi_input_ports; p; p = p->next)
 104     {
 105         struct cbox_usb_midi_input *umi = p->data;
 106         cbox_midi_buffer_clear(&umi->midi_buffer);
 107         umi->transfer = usbio_transfer_new(uii->usbctx,  "MIDI In", 0, 0, umi);
 108         libusb_fill_bulk_transfer(umi->transfer->transfer, umi->handle, umi->endpoint, umi->midi_recv_data, umi->max_packet_size, midi_transfer_cb, umi->transfer, 0);
 109         uii->midi_input_port_buffers[pn++] = &umi->midi_buffer;
 110     }
 111     for(GList *p = uii->rt_midi_input_ports; p; p = p->next)
 112     {
 113         struct cbox_usb_midi_input *umi = p->data;
 114         int res = usbio_transfer_submit(umi->transfer);
 115         if (res != 0)
 116         {
 117             usbio_transfer_destroy(umi->transfer);
 118             umi->transfer = NULL;
 119         }
 120     }
 121 }
 122
 123 void usbio_stop_midi_capture(struct cbox_usb_io_impl *uii)
 124 {
 125     for(GList *p = uii->rt_midi_input_ports; p; p = p->next)
 126     {
 127         struct cbox_usb_midi_input *umi = p->data;
 128
 129         if (!umi->transfer)
 130             continue;
 131
 132         usbio_transfer_shutdown(umi->transfer);
 133         usbio_transfer_destroy(umi->transfer);
 134         umi->transfer = NULL;
 135         cbox_midi_buffer_clear(&umi->midi_buffer);
 136     }
 137     free(uii->midi_input_port_buffers);
 138     free(uii->midi_input_port_pos);
 139     g_list_free(uii->rt_midi_input_ports);
 140 }
 141
 142 void cbox_usb_midi_info_init(struct cbox_usb_midi_info *umi, struct cbox_usb_device_info *udi)
 143 {
 144     umi->udi = udi;
 145     umi->intf = -1;
 146     umi->alt_setting = -1;
 147     umi->epdesc.found = FALSE;
 148 }
 149
 150 struct cbox_usb_midi_input *usbio_open_midi_interface(struct cbox_usb_io_impl *uii, const struct cbox_usb_midi_info *uminf, struct libusb_device_handle *handle)
 151 {
 152     struct cbox_usb_device_info *devinfo = uminf->udi;
 153     int bus = devinfo->bus;
 154     int devadr = devinfo->devadr;
 155     GError *error = NULL;
 156     // printf("Has MIDI port\n");
 157     // printf("Output endpoint address = %02x\n", ep->bEndpointAddress);
 158     if (!configure_usb_interface(handle, bus, devadr, uminf->intf, uminf->alt_setting, &error))
 159     {
 160         g_warning("%s", error->message);
 161         g_error_free(error);
 162         return NULL;
 163     }
 164
 165     struct cbox_usb_midi_input *umi = malloc(sizeof(struct cbox_usb_midi_input));
 166     umi->uii = uii;
 167     umi->devinfo = devinfo;
 168     umi->handle = handle;
 169     umi->busdevadr = devinfo->busdevadr;
 170     umi->endpoint = uminf->epdesc.bEndpointAddress;
 171     cbox_midi_buffer_init(&umi->midi_buffer);
 172     uii->midi_input_ports = g_list_prepend(uii->midi_input_ports, umi);
 173     int len = uminf->epdesc.wMaxPacketSize;
 174     if (len > 256)
 175         len = 256;
 176     umi->max_packet_size = len;
 177
 178     // Drain the output buffer of the device - otherwise playing a few notes and running the program will cause
 179     // those notes to play.
 180     unsigned char flushbuf[256];
 181     int transferred = 0;
 182     while(0 == libusb_bulk_transfer(handle, umi->endpoint, flushbuf, umi->max_packet_size, &transferred, 10) && transferred > 0)
 183         usleep(1000);
 184     devinfo->status = CBOX_DEVICE_STATUS_OPENED;
 185
 186     return umi;
 187 }
 188