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Annotation of embedaddon/bmon/src/out_audio.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * out_audio.c         Save events
        !             3:  *
        !             4:  * Copyright (c) 2001-2005 Thomas Graf <tgraf@suug.ch>
        !             5:  *                        Claudio Mettler <claudio@fnord.ch>
        !             6:  *
        !             7:  * Permission is hereby granted, free of charge, to any person obtaining a
        !             8:  * copy of this software and associated documentation files (the "Software"),
        !             9:  * to deal in the Software without restriction, including without limitation
        !            10:  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
        !            11:  * and/or sell copies of the Software, and to permit persons to whom the
        !            12:  * Software is furnished to do so, subject to the following conditions:
        !            13:  *
        !            14:  * The above copyright notice and this permission notice shall be included
        !            15:  * in all copies or substantial portions of the Software.
        !            16:  *
        !            17:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
        !            18:  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            19:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            20:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            21:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
        !            22:  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
        !            23:  * DEALINGS IN THE SOFTWARE.
        !            24:  */
        !            25: 
        !            26: #include <bmon/bmon.h>
        !            27: #include <bmon/node.h>
        !            28: #include <bmon/output.h>
        !            29: #include <bmon/graph.h>
        !            30: #include <bmon/input.h>
        !            31: #include <bmon/utils.h>
        !            32: #include <inttypes.h>
        !            33: 
        !            34: #include <alsa/asoundlib.h>
        !            35: 
        !            36: static int c_max = 1000;
        !            37: static int divisor;
        !            38: 
        !            39: static snd_seq_t *seq_handle;
        !            40: static snd_seq_event_t ev;
        !            41: 
        !            42: #define CELL_MAX 127.0f
        !            43: 
        !            44: void audio_draw(void)
        !            45: {
        !            46:        rate_cnt_t rx, tx;
        !            47:        stat_attr_t *a;
        !            48:        item_t *it = get_current_item();
        !            49: 
        !            50:        if (it == NULL)
        !            51:                return;
        !            52: 
        !            53:        a = current_attr(it->i_graph_sel);
        !            54:        if (a == NULL)
        !            55:                return;
        !            56: 
        !            57:        rx = attr_get_rx_rate(a);
        !            58:        tx = attr_get_tx_rate(a);
        !            59: 
        !            60:        if (rx > c_max)
        !            61:                rx = c_max;
        !            62: 
        !            63:        if (tx > c_max)
        !            64:                tx = c_max;
        !            65: 
        !            66:        rx /= divisor;
        !            67:        tx /= divisor;
        !            68: 
        !            69:        snd_seq_ev_set_noteon(&ev, 0, rx, 127);
        !            70:        snd_seq_event_output_direct(seq_handle, &ev);
        !            71:        snd_seq_ev_set_noteoff(&ev, 0, rx, 127);
        !            72:        snd_seq_event_output_direct(seq_handle, &ev);
        !            73: 
        !            74:        snd_seq_ev_set_noteon(&ev, 1, tx, 127);
        !            75:        snd_seq_event_output_direct(seq_handle, &ev);
        !            76:        snd_seq_ev_set_noteoff(&ev, 1, tx, 127);
        !            77:        snd_seq_event_output_direct(seq_handle, &ev);
        !            78: }
        !            79: 
        !            80: static void print_module_help(void)
        !            81: {
        !            82:        printf(
        !            83:        "Audio - Audio Output\n" \
        !            84:        "\n" \
        !            85:        "  Outputs the currently selected attribute rate as MIDI\n" \
        !            86:        "  sequence. OUT ::= (max(RATE,MAX)) / (MAX/127)\n" \
        !            87:        "\n" \
        !            88:        "  Authors: Claudio Mettler <claudio@fnord.ch>\n" \
        !            89:        "           Thomas Graf <tgraf@suug.ch>\n" \
        !            90:        "\n" \
        !            91:        "  Options:\n" \
        !            92:        "    max=NUM          Upper limit\n");
        !            93: }
        !            94: 
        !            95: static void audio_set_opts(tv_t *attrs)
        !            96: {
        !            97:        while (attrs) {
        !            98:                if (!strcasecmp(attrs->type, "max") && attrs->value)
        !            99:                        c_max = strtol(attrs->value, NULL, 0);
        !           100:                else if (!strcasecmp(attrs->type, "help")) {
        !           101:                        print_module_help();
        !           102:                        exit(0);
        !           103:                }
        !           104:                
        !           105:                attrs = attrs->next;
        !           106:        }
        !           107: }
        !           108: 
        !           109: static void audio_shutdown(void)
        !           110: {
        !           111: }
        !           112: 
        !           113: static int audio_probe(void)
        !           114: {
        !           115:        snd_seq_addr_t src;
        !           116:        
        !           117:        if (snd_seq_open(&seq_handle, "default", SND_SEQ_OPEN_OUTPUT, 0) < 0) {
        !           118:                quit("Failed to access the ALSA sequencer.");
        !           119:                return 0;
        !           120:        }
        !           121: 
        !           122:        snd_seq_set_client_name(seq_handle, "bmonmidibridge");
        !           123:        src.client = snd_seq_client_id(seq_handle);
        !           124:        src.port = snd_seq_create_simple_port(seq_handle, "Output",
        !           125:                SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ,
        !           126:                SND_SEQ_PORT_TYPE_APPLICATION);
        !           127: 
        !           128:        
        !           129:        snd_seq_ev_clear(&ev);
        !           130:        snd_seq_ev_set_source(&ev, src.port);
        !           131:        snd_seq_ev_set_subs(&ev);
        !           132:        snd_seq_ev_set_direct(&ev);
        !           133: 
        !           134:        divisor = ceil(((double) c_max / CELL_MAX));
        !           135: 
        !           136:        return 1;
        !           137: }
        !           138: 
        !           139: static struct output_module audio_ops = {
        !           140:        .om_name = "audio",
        !           141:        .om_draw = audio_draw,
        !           142:        .om_set_opts = audio_set_opts,
        !           143:        .om_probe = audio_probe,
        !           144:        .om_shutdown audio_shutdown,
        !           145: };
        !           146: 
        !           147: static void __init audio_init(void)
        !           148: {
        !           149:        register_secondary_output_module(&audio_ops);
        !           150: }