How to save and restore MIDI connexion (ALSA sequencer) - Linux-audio-dev

14 Dec 2007

Hello !

Thanks for your response but I don't succeed to have something working :(

my code :
init:
    if (snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0) >= 0) {
        m_iClient = snd_seq_set_client_name(seq, "LiveMix");
        m_iPort = snd_seq_create_simple_port(seq, "control", 0,
                SND_SEQ_PORT_TYPE_MIDI_GENERIC | SND_SEQ_PORT_TYPE_SOFTWARE
| SND_SEQ_PORT_TYPE_APPLICATION);
        m_iMidi = snd_seq_create_simple_port(seq, "control",
                SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ |
SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE,
                SND_SEQ_PORT_TYPE_APPLICATION);
    } else {
        qDebug() << "The ALSA MIDI system is not available. No ports based
on it will be created";
    }

get (to save) :
    snd_seq_client_info_t *cinfo;
    snd_seq_port_info_t *pinfo;
    snd_seq_client_info_alloca(&cinfo);
    snd_seq_port_info_alloca(&pinfo);
    snd_seq_client_info_set_client(cinfo, -1);
    snd_seq_port_info_set_client(pinfo,
snd_seq_client_info_get_client(cinfo));
    snd_seq_port_info_set_port(pinfo, m_iMidi);
    snd_seq_query_subscribe_set_client(subs, m_iClient);
    snd_seq_query_subscribe_set_port(subs, m_iMidi);
    snd_seq_query_subscribe_set_type(subs, SND_SEQ_QUERY_SUBS_READ);
    snd_seq_query_subscribe_set_index(subs, 0);
    while (snd_seq_query_port_subscribers(seq, subs) >= 0) {
        const snd_seq_addr_t *addr;
        addr = snd_seq_query_subscribe_get_addr(subs);
        qDebug()<<222<<addr->client<<addr->port;
        snd_seq_query_subscribe_set_index(subs,
snd_seq_query_subscribe_get_index(subs) + 1);
    }

    snd_seq_query_subscribe_alloca(&subs);
    snd_seq_query_subscribe_set_client(subs, m_iClient);
    snd_seq_query_subscribe_set_port(subs, m_iMidi);
    snd_seq_query_subscribe_set_type(subs, SND_SEQ_QUERY_SUBS_WRITE);
    snd_seq_query_subscribe_set_index(subs, 0);
    while (snd_seq_query_port_subscribers(seq, subs) >= 0) {
        const snd_seq_addr_t *addr;
        addr = snd_seq_query_subscribe_get_addr(subs);
        qDebug()<<333<<addr->client<<addr->port;
    }

The first block seem to return all the client-port, the second return
nothing.  :(

Does anybody have an idea ?

Thanks in advance
Stéphane

On Dec 10, 2007 9:02 AM, Clemens Ladisch < cladisch(a)fastmail.net&gt; wrote:

...
  Stéphane Brunner wrote:
  Than I want to know with port will be connected
on witch other to  reconnect
  it on other LiveMix run. 
 Try snd_seq_query_port_subscribers().

 HTH
 Clemens
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-- 
Stéphane Brunner
mail : stephane.brunner(a)gmail.com
messageries instantanées : stephane.brunner(a)gmail.com (
http://talk.google.com)
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