joeylib2/examples/audio/audio.c

// Audio demo: starts a .MOD on entry, triggers a short digital SFX
// every time SPACE is tapped, and exits on ESC. The MOD and SFX bytes
// are NOT embedded in the binary -- they're loaded at runtime from
// the DATA folder shipped on the disk image (see make/<plat>.mk for
// each platform's packaging step).
//
// On platforms where the audio HAL is still a stub, joeyAudioInit
// returns false, every audio call is a quiet no-op, and the demo runs
// as a silent input loop -- you can confirm the build links and the
// input plumbing still works without hearing anything.

#include <stdio.h>
#include <stdlib.h>

#include <joey/joey.h>

// Each platform encodes the MOD differently. The IIgs build converts
// test.mod -> test.ntp via joeymod at build time and ships the .NTP;
// every other platform ships the raw .MOD. test.sfx is the same raw
// PCM blob everywhere.
#if defined(JOEYLIB_PLATFORM_IIGS)
#  define TEST_MOD_PATH  "DATA/TEST.NTP"
#else
#  define TEST_MOD_PATH  "DATA/test.mod"
#endif
#define TEST_SFX_PATH    "DATA/test.sfx"

#define SFX_SLOT      0
#define SFX_RATE_HZ   8000

#define COLOR_BG      0
#define COLOR_HINT    1
#define COLOR_BAR     2

#define BAR_X         16
#define BAR_Y         88
#define BAR_W         (SURFACE_WIDTH - 32)
#define BAR_H         16


// Read an entire file into a freshly allocated buffer. Caller must
// free(*outBytes) once the audio engine has consumed the data.
// Returns false if the file is missing, empty, or larger than maxLen.
static bool loadFile(const char *path, uint32_t maxLen, uint8_t **outBytes, uint32_t *outLen) {
    FILE    *fp;
    long     fileSize;
    uint8_t *buf;
    size_t   readBytes;

    fp = fopen(path, "rb");
    if (fp == NULL) {
        return false;
    }
    if (fseek(fp, 0L, SEEK_END) != 0) {
        fclose(fp);
        return false;
    }
    fileSize = ftell(fp);
    if (fileSize <= 0 || (uint32_t)fileSize > maxLen) {
        fclose(fp);
        return false;
    }
    if (fseek(fp, 0L, SEEK_SET) != 0) {
        fclose(fp);
        return false;
    }
    buf = (uint8_t *)malloc((size_t)fileSize);
    if (buf == NULL) {
        fclose(fp);
        return false;
    }
    readBytes = fread(buf, 1, (size_t)fileSize, fp);
    fclose(fp);
    if (readBytes != (size_t)fileSize) {
        free(buf);
        return false;
    }
    *outBytes = buf;
    *outLen   = (uint32_t)fileSize;
    return true;
}


static void buildPalette(SurfaceT *screen) {
    uint16_t colors[SURFACE_COLORS_PER_PALETTE];
    uint16_t i;

    for (i = 0; i < SURFACE_COLORS_PER_PALETTE; i++) {
        colors[i] = 0x0000;
    }
    colors[COLOR_BG]   = 0x0000;
    colors[COLOR_HINT] = 0x0444;
    colors[COLOR_BAR]  = 0x00F0;

    paletteSet(screen, 0, colors);
}


// Visual feedback for "audio is running, but you cannot tell on a
// stub HAL": pulse a horizontal bar between the hint color and the
// active color whenever SFX has fired this frame.
static void initialPaint(SurfaceT *screen, bool audioOk) {
    surfaceClear(screen, COLOR_BG);
    fillRect(screen, BAR_X, BAR_Y, BAR_W, BAR_H,
             audioOk ? COLOR_HINT : COLOR_BG);
    stagePresent();
}


int main(void) {
    JoeyConfigT  config;
    SurfaceT    *screen;
    bool         audioOk;
    int16_t      flashFrames;
    uint8_t     *modBytes;
    uint32_t     modLen;
    uint8_t     *sfxBytes;
    uint32_t     sfxLen;

    config.hostMode     = HOST_MODE_TAKEOVER;
    config.codegenBytes = 8 * 1024;
    config.maxSurfaces  = 4;
    config.audioBytes   = 64UL * 1024;
    config.assetBytes   = 128UL * 1024;

    if (!joeyInit(&config)) {
        fprintf(stderr, "joeyInit failed: %s\n", joeyLastError());
        return 1;
    }

    screen = stageGet();
    if (screen == NULL) {
        fprintf(stderr, "stageGet returned NULL\n");
        joeyShutdown();
        return 1;
    }

    modBytes = NULL;
    sfxBytes = NULL;
    modLen   = 0;
    sfxLen   = 0;

    audioOk = joeyAudioInit();
    if (audioOk) {
        if (loadFile(TEST_MOD_PATH, 64UL * 1024UL, &modBytes, &modLen)) {
            joeyAudioPlayMod(modBytes, modLen, true);
            // joeyAudioPlayMod copies the bytes into the engine's own
            // buffer; safe to release ours immediately.
            free(modBytes);
            modBytes = NULL;
        }
        (void)loadFile(TEST_SFX_PATH, 64UL * 1024UL, &sfxBytes, &sfxLen);
    }

    buildPalette(screen);
    scbSetRange(screen, 0, SURFACE_HEIGHT - 1, 0);
    initialPaint(screen, audioOk);

    flashFrames = 0;
    for (;;) {
        joeyWaitVBL();
        joeyInputPoll();
        joeyAudioFrameTick();
        if (joeyKeyPressed(KEY_ESCAPE)) {
            break;
        }
        if (joeyKeyPressed(KEY_SPACE) && sfxBytes != NULL) {
            joeyAudioPlaySfx(SFX_SLOT, sfxBytes, sfxLen, SFX_RATE_HZ);
            flashFrames = 8;
        }

        if (flashFrames > 0) {
            fillRect(screen, BAR_X, BAR_Y, BAR_W, BAR_H, COLOR_BAR);
            stagePresentRect(BAR_X, BAR_Y, BAR_W, BAR_H);
            flashFrames--;
            if (flashFrames == 0) {
                fillRect(screen, BAR_X, BAR_Y, BAR_W, BAR_H, COLOR_HINT);
                stagePresentRect(BAR_X, BAR_Y, BAR_W, BAR_H);
            }
        }
    }

    if (audioOk) {
        joeyAudioStopMod();
        joeyAudioShutdown();
    }
    if (sfxBytes != NULL) {
        free(sfxBytes);
    }
    joeyShutdown();
    return 0;
}