rockbox/apps/plugins/midi/midiplay.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 Karl Kurbjun based on midi2wav by Stepan Moskovchenko
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "plugin.h"
#include "guspat.h"
#include "midiutil.h"
#include "synth.h"
#include "sequencer.h"
#include "midifile.h"

PLUGIN_HEADER
PLUGIN_IRAM_DECLARE

/* variable button definitions */
#if CONFIG_KEYPAD == RECORDER_PAD
#define BTN_QUIT     BUTTON_OFF
#define BTN_RIGHT    BUTTON_RIGHT
#define BTN_UP       BUTTON_UP
#define BTN_DOWN     BUTTON_DOWN

#elif CONFIG_KEYPAD == ONDIO_PAD
#define BTN_QUIT         BUTTON_OFF
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_UP
#define BTN_DOWN         BUTTON_DOWN

#elif (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
#define BTN_QUIT         BUTTON_OFF
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_UP
#define BTN_DOWN         BUTTON_DOWN

#define BTN_RC_QUIT      BUTTON_RC_STOP

#elif (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \
      (CONFIG_KEYPAD == IPOD_1G2G_PAD)
#define BTN_QUIT         (BUTTON_SELECT | BUTTON_MENU)
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_SCROLL_FWD
#define BTN_DOWN         BUTTON_SCROLL_BACK

#elif (CONFIG_KEYPAD == GIGABEAT_PAD)
#define BTN_QUIT         BUTTON_POWER
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_UP
#define BTN_DOWN         BUTTON_DOWN

#elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
(CONFIG_KEYPAD == SANSA_C200_PAD)
#define BTN_QUIT         BUTTON_POWER
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_UP
#define BTN_DOWN         BUTTON_DOWN

#elif CONFIG_KEYPAD == IAUDIO_X5M5_PAD
#define BTN_QUIT         BUTTON_POWER
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_UP
#define BTN_DOWN         BUTTON_DOWN

#elif CONFIG_KEYPAD == IRIVER_H10_PAD
#define BTN_QUIT         BUTTON_POWER
#define BTN_RIGHT        BUTTON_RIGHT
#define BTN_UP           BUTTON_SCROLL_UP
#define BTN_DOWN         BUTTON_SCROLL_DOWN

#endif

#undef SYNC

#ifdef SIMULATOR
	#define SYNC
#endif

struct MIDIfile * mf IBSS_ATTR;

int numberOfSamples IBSS_ATTR; /* the number of samples in the current tick */
long bpm IBSS_ATTR;

int32_t gmbuf[BUF_SIZE*NBUF];
static unsigned int samples_in_buf;

int quit=0;
struct plugin_api * rb;

static int midimain(void * filename);

enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
{
    int retval = 0;

    PLUGIN_IRAM_INIT(api)

    rb = api;
    if(parameter == NULL)
    {
        rb->splash(HZ*2, " Play .MID file ");
        return PLUGIN_OK;
    }
    rb->lcd_setfont(0);

#if defined(HAVE_ADJUSTABLE_CPU_FREQ)
    rb->cpu_boost(true);
#endif

    printf("%s", parameter);
    /*   rb->splash(HZ, true, parameter); */

#ifdef RB_PROFILE
    rb->profile_thread();
#endif

    retval = midimain(parameter);

#ifdef RB_PROFILE
    rb->profstop();
#endif

    rb->pcm_play_stop();
    rb->pcm_set_frequency(HW_SAMPR_DEFAULT);

#if defined(HAVE_ADJUSTABLE_CPU_FREQ)
    rb->cpu_boost(false);
#endif
    rb->splash(HZ, "FINISHED PLAYING");

    if(retval == -1)
        return PLUGIN_ERROR;
    return PLUGIN_OK;
}

bool swap=0;
bool lastswap=1;

static inline void synthbuf(void)
{
    int32_t *outptr;
    int i=BUF_SIZE;

#ifndef SYNC
    if(lastswap==swap) return;
    lastswap=swap;

    outptr=(swap ? gmbuf : gmbuf+BUF_SIZE);
#else
    outptr=gmbuf;
#endif

    /* synth samples for as many whole ticks as we can fit in the buffer */
    for(; i >= numberOfSamples; i -= numberOfSamples)
    {
        synthSamples((int32_t*)outptr, numberOfSamples);
        outptr += numberOfSamples;
        if( tick() == 0 )
            quit=1;
    }

    /* how many samples did we write to the buffer? */
    samples_in_buf = BUF_SIZE-i;

}

void get_more(unsigned char** start, size_t* size)
{
#ifndef SYNC
    if(lastswap!=swap)
    {
        printf("Buffer miss!"); // Comment out the printf to make missses less noticable.
    }

#else
    synthbuf();  // For some reason midiplayer crashes when an update is forced
#endif

    *size = samples_in_buf*sizeof(int32_t);
#ifndef SYNC
    *start = (unsigned char*)((swap ? gmbuf : gmbuf + BUF_SIZE));
    swap=!swap;
#else
    *start = (unsigned char*)(gmbuf);
#endif
}

static int midimain(void * filename)
{
    int notesUsed = 0;
    int a=0;
    printf("Loading file");
    mf= loadFile(filename);

    if(mf == NULL)
    {
        printf("Error loading file.");
        return -1;
    }

    if (initSynth(mf, ROCKBOX_DIR "/patchset/patchset.cfg",
        ROCKBOX_DIR "/patchset/drums.cfg") == -1)
        return -1;

    rb->pcm_play_stop();
#if INPUT_SRC_CAPS != 0
    /* Select playback */
    rb->audio_set_input_source(AUDIO_SRC_PLAYBACK, SRCF_PLAYBACK);
    rb->audio_set_output_source(AUDIO_SRC_PLAYBACK);
#endif
    rb->pcm_set_frequency(SAMPLE_RATE); // 44100 22050 11025

    /*
        * tick() will do one MIDI clock tick. Then, there's a loop here that
        * will generate the right number of samples per MIDI tick. The whole
        * MIDI playback is timed in terms of this value.. there are no forced
        * delays or anything. It just produces enough samples for each tick, and
        * the playback of these samples is what makes the timings right.
        *
        * This seems to work quite well. On a laptop, anyway.
        */

    printf("Okay, starting sequencing");

    bpm=mf->div*1000000/tempo;
    numberOfSamples=SAMPLE_RATE/bpm;



    /* Skip over any junk in the beginning of the file, so start playing */
    /* after the first note event */
    do
    {
        notesUsed = 0;
        for(a=0; a<MAX_VOICES; a++)
            if(voices[a].isUsed == 1)
                notesUsed++;
        tick();
    } while(notesUsed == 0);

    synthbuf();
    rb->pcm_play_data(&get_more, NULL, 0);

    int vol=0;

    while(!quit)
    {
    #ifndef SYNC
        synthbuf();
    #endif
        rb->yield();

        /* Prevent idle poweroff */
        rb->reset_poweroff_timer();

        /* Code taken from Oscilloscope plugin */
        switch(rb->button_get(false))
        {
                case BTN_UP:
                case BTN_UP | BUTTON_REPEAT:
                    vol = rb->global_settings->volume;
                    if (vol < rb->sound_max(SOUND_VOLUME))
                    {
                        vol++;
                        rb->sound_set(SOUND_VOLUME, vol);
                        rb->global_settings->volume = vol;
                    }
                    break;

                case BTN_DOWN:
                case BTN_DOWN | BUTTON_REPEAT:
                    vol = rb->global_settings->volume;
                    if (vol > rb->sound_min(SOUND_VOLUME))
                    {
                        vol--;
                        rb->sound_set(SOUND_VOLUME, vol);
                        rb->global_settings->volume = vol;
                    }
                    break;

                case BTN_RIGHT:
                {
                    /* Skip 3 seconds */
                    /* Should skip length be retrieved from the RB settings? */
                    int samp = 3*SAMPLE_RATE;
                    int tickCount = samp / numberOfSamples;
                    int a=0;
                    for(a=0; a<tickCount; a++)
                        tick();
                    break;
                }
#ifdef BTN_RC_QUIT
                case BTN_RC_QUIT:
#endif
                case BTN_QUIT:
                    quit=1;
        }


    }

    return 0;
}