common/JackMidiAPI.cpp

   1 /*
   2 Copyright (C) 2007 Dmitry Baikov
   3 Original JACK MIDI implementation Copyright (C) 2004 Ian Esten
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18
  19 */
  20
  21 #include "JackError.h"
  22 #include "JackMidiPort.h"
  23 #include <errno.h>
  24 #include <string.h>
  25
  26 #ifdef __cplusplus
  27 extern "C"
  28 {
  29 #endif
  30
  31     LIB_EXPORT uint32_t jack_midi_get_event_count(void* port_buffer);
  32
  33     LIB_EXPORT int jack_midi_event_get(jack_midi_event_t* event,
  34                                    void* port_buffer, uint32_t event_index);
  35
  36     LIB_EXPORT void jack_midi_clear_buffer(void* port_buffer);
  37
  38     LIB_EXPORT size_t jack_midi_max_event_size(void* port_buffer);
  39
  40     LIB_EXPORT jack_midi_data_t* jack_midi_event_reserve(void* port_buffer,
  41             jack_nframes_t time, size_t data_size);
  42
  43     LIB_EXPORT int jack_midi_event_write(void* port_buffer,
  44                                      jack_nframes_t time, const jack_midi_data_t* data, size_t data_size);
  45
  46     LIB_EXPORT jack_nframes_t jack_midi_get_lost_event_count(void* port_buffer);
  47
  48 #ifdef __cplusplus
  49 }
  50 #endif
  51
  52 using namespace Jack;
  53
  54 LIB_EXPORT
  55 uint32_t jack_midi_get_event_count(void* port_buffer)
  56 {
  57     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  58     if (!buf || !buf->IsValid()) {
  59         return 0;
  60     }
  61     return buf->event_count;
  62 }
  63
  64 LIB_EXPORT
  65 int jack_midi_event_get(jack_midi_event_t *event, void* port_buffer, uint32_t event_index)
  66 {
  67     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  68     if (!buf || !buf->IsValid()) {
  69         return -EINVAL;
  70     }
  71     if (event_index >= buf->event_count) {
  72         return -ENOBUFS;
  73     }
  74     JackMidiEvent* ev = &buf->events[event_index];
  75     event->time = ev->time;
  76     event->size = ev->size;
  77     event->buffer = ev->GetData(buf);
  78     return 0;
  79 }
  80
  81 LIB_EXPORT
  82 void jack_midi_clear_buffer(void* port_buffer)
  83 {
  84     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  85     if (buf && buf->IsValid()) {
  86         buf->Reset(buf->nframes);
  87     }
  88 }
  89
  90 LIB_EXPORT
  91 size_t jack_midi_max_event_size(void* port_buffer)
  92 {
  93     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  94     if (buf && buf->IsValid())
  95         return buf->MaxEventSize();
  96     return 0;
  97 }
  98
  99 LIB_EXPORT
 100 jack_midi_data_t* jack_midi_event_reserve(void* port_buffer, jack_nframes_t time, size_t data_size)
 101 {
 102     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 103     if (! buf) {
 104         jack_error("jack_midi_event_reserve: port buffer is set to NULL");
 105         return 0;
 106     }
 107     if (! buf->IsValid()) {
 108         jack_error("jack_midi_event_reserve: port buffer is invalid");
 109         return 0;
 110     }
 111     if (time >= buf->nframes) {
 112         jack_error("jack_midi_event_reserve: time parameter is out of range "
 113                    "(%lu >= %lu)", time, buf->nframes);
 114         return 0;
 115     }
 116     if (buf->event_count && (buf->events[buf->event_count - 1].time > time)) {
 117         jack_error("jack_midi_event_reserve: time parameter is earlier than "
 118                    "last reserved event");
 119         return 0;
 120     }
 121     return buf->ReserveEvent(time, data_size);
 122 }
 123
 124 LIB_EXPORT
 125 int jack_midi_event_write(void* port_buffer,
 126                           jack_nframes_t time, const jack_midi_data_t* data, size_t data_size)
 127 {
 128     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 129     if (!buf && !buf->IsValid()) {
 130         return -EINVAL;
 131     }
 132     if (time >= buf->nframes || (buf->event_count && buf->events[buf->event_count - 1].time > time)) {
 133         return -EINVAL;
 134     }
 135     jack_midi_data_t* dest = buf->ReserveEvent(time, data_size);
 136     if (!dest) {
 137         return -ENOBUFS;
 138     }
 139     memcpy(dest, data, data_size);
 140     return 0;
 141 }
 142
 143 LIB_EXPORT
 144 uint32_t jack_midi_get_lost_event_count(void* port_buffer)
 145 {
 146     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 147     if (buf && buf->IsValid())
 148         return buf->lost_events;
 149     return 0;
 150 }