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 void jack_midi_reset_buffer(void* port_buffer);
  39
  40     LIB_EXPORT size_t jack_midi_max_event_size(void* port_buffer);
  41
  42     LIB_EXPORT jack_midi_data_t* jack_midi_event_reserve(void* port_buffer,
  43             jack_nframes_t time, size_t data_size);
  44
  45     LIB_EXPORT int jack_midi_event_write(void* port_buffer,
  46                                      jack_nframes_t time, const jack_midi_data_t* data, size_t data_size);
  47
  48     LIB_EXPORT jack_nframes_t jack_midi_get_lost_event_count(void* port_buffer);
  49
  50 #ifdef __cplusplus
  51 }
  52 #endif
  53
  54 using namespace Jack;
  55
  56 LIB_EXPORT
  57 uint32_t jack_midi_get_event_count(void* port_buffer)
  58 {
  59     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  60     if (!buf || !buf->IsValid()) {
  61         return 0;
  62     }
  63     return buf->event_count;
  64 }
  65
  66 LIB_EXPORT
  67 int jack_midi_event_get(jack_midi_event_t *event, void* port_buffer, uint32_t event_index)
  68 {
  69     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  70     if (!buf || !buf->IsValid()) {
  71         return -EINVAL;
  72     }
  73     if (event_index >= buf->event_count) {
  74         return -ENOBUFS;
  75     }
  76     JackMidiEvent* ev = &buf->events[event_index];
  77     event->time = ev->time;
  78     event->size = ev->size;
  79     event->buffer = ev->GetData(buf);
  80     return 0;
  81 }
  82
  83 LIB_EXPORT
  84 void jack_midi_clear_buffer(void* port_buffer)
  85 {
  86     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
  87     if (buf && buf->IsValid()) {
  88         buf->Reset(buf->nframes);
  89     }
  90 }
  91
  92 LIB_EXPORT
  93 void jack_midi_reset_buffer(void* port_buffer)
  94 {
  95     MidiBufferInit(port_buffer, BUFFER_SIZE_MAX, BUFFER_SIZE_MAX);
  96 }
  97
  98 LIB_EXPORT
  99 size_t jack_midi_max_event_size(void* port_buffer)
 100 {
 101     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 102     if (buf && buf->IsValid()) {
 103         return buf->MaxEventSize();
 104     }
 105     return 0;
 106 }
 107
 108 LIB_EXPORT
 109 jack_midi_data_t* jack_midi_event_reserve(void* port_buffer, jack_nframes_t time, size_t data_size)
 110 {
 111     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 112     if (! buf) {
 113         jack_error("jack_midi_event_reserve: port buffer is set to NULL");
 114         return 0;
 115     }
 116     if (! buf->IsValid()) {
 117         jack_error("jack_midi_event_reserve: port buffer is invalid");
 118         return 0;
 119     }
 120     if (time >= buf->nframes) {
 121         jack_error("jack_midi_event_reserve: time parameter is out of range "
 122                    "(%lu >= %lu)", time, buf->nframes);
 123         return 0;
 124     }
 125     if (buf->event_count && (buf->events[buf->event_count - 1].time > time)) {
 126         jack_error("jack_midi_event_reserve: time parameter is earlier than "
 127                    "last reserved event");
 128         return 0;
 129     }
 130     return buf->ReserveEvent(time, data_size);
 131 }
 132
 133 LIB_EXPORT
 134 int jack_midi_event_write(void* port_buffer,
 135                           jack_nframes_t time, const jack_midi_data_t* data, size_t data_size)
 136 {
 137     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 138     if (!buf || !buf->IsValid()) {
 139         return -EINVAL;
 140     }
 141     if (time >= buf->nframes || (buf->event_count && buf->events[buf->event_count - 1].time > time)) {
 142         return -EINVAL;
 143     }
 144     jack_midi_data_t* dest = buf->ReserveEvent(time, data_size);
 145     if (!dest) {
 146         return -ENOBUFS;
 147     }
 148     memcpy(dest, data, data_size);
 149     return 0;
 150 }
 151
 152 LIB_EXPORT
 153 uint32_t jack_midi_get_lost_event_count(void* port_buffer)
 154 {
 155     JackMidiBuffer *buf = (JackMidiBuffer*)port_buffer;
 156     if (buf && buf->IsValid()) {
 157         return buf->lost_events;
 158     }
 159     return 0;
 160 }