C++ (Cpp) dlsymm Examples

Example #1

static av_cold int a52_decode_init(AVCodecContext *avctx)
{
    AC3DecodeState *s = avctx->priv_data;

#ifdef CONFIG_LIBA52BIN
    s->handle = dlopen(liba52name, RTLD_LAZY);
    if (!s->handle)
    {
        av_log( avctx, AV_LOG_ERROR, "A52 library %s could not be opened! \n%s\n", liba52name, dlerror());
        return -1;
    }
    s->a52_init = (a52_state_t* (*)(uint32_t)) dlsymm(s->handle, "a52_init");
    s->a52_samples = (sample_t* (*)(a52_state_t*)) dlsymm(s->handle, "a52_samples");
    s->a52_syncinfo = (int (*)(uint8_t*, int*, int*, int*)) dlsymm(s->handle, "a52_syncinfo");
    s->a52_frame = (int (*)(a52_state_t*, uint8_t*, int*, sample_t*, sample_t)) dlsymm(s->handle, "a52_frame");
    s->a52_block = (int (*)(a52_state_t*)) dlsymm(s->handle, "a52_block");
    s->a52_free = (void (*)(a52_state_t*)) dlsymm(s->handle, "a52_free");
    if (!s->a52_init || !s->a52_samples || !s->a52_syncinfo
        || !s->a52_frame || !s->a52_block || !s->a52_free)
    {
        dlclose(s->handle);
        return -1;
    }
#else
    s->handle = 0;
    s->a52_init = a52_init;
    s->a52_samples = a52_samples;
    s->a52_syncinfo = a52_syncinfo;
    s->a52_frame = a52_frame;
    s->a52_block = a52_block;
    s->a52_free = a52_free;
#endif
    s->state = s->a52_init(0); /* later use CPU flags */
    s->samples = s->a52_samples(s->state);

    /* allow downmixing to stereo or mono */
    if (avctx->channels > 0 && avctx->request_channels > 0 &&
            avctx->request_channels < avctx->channels &&
            avctx->request_channels <= 2) {
        avctx->channels = avctx->request_channels;
    }

    return 0;
}

Example #2

File: a52dec.c Project: foogywoo/drone

static int a52_decode_init(AVCodecContext *avctx)
{
    AC3DecodeState *s = avctx->priv_data;

#ifdef CONFIG_A52BIN
    s->handle = dlopen(liba52name, RTLD_LAZY);
    if (!s->handle)
    {
	fprintf(stderr, "A52 library %s could not be opened! \n%s\n", liba52name, dlerror());
        return -1;
    }
    s->a52_init = (a52_state_t* (*)(uint32_t)) dlsymm(s->handle, "a52_init");
    s->a52_samples = (sample_t* (*)(a52_state_t*)) dlsymm(s->handle, "a52_samples");
    s->a52_syncinfo = (int (*)(uint8_t*, int*, int*, int*)) dlsymm(s->handle, "a52_syncinfo");
    s->a52_frame = (int (*)(a52_state_t*, uint8_t*, int*, sample_t*, sample_t)) dlsymm(s->handle, "a52_frame");
    s->a52_block = (int (*)(a52_state_t*)) dlsymm(s->handle, "a52_block");
    s->a52_free = (void (*)(a52_state_t*)) dlsymm(s->handle, "a52_free");
    if (!s->a52_init || !s->a52_samples || !s->a52_syncinfo
        || !s->a52_frame || !s->a52_block || !s->a52_free)
    {
	dlclose(s->handle);
        return -1;
    }
#else
    /* static linked version */
    s->handle = 0;
    s->a52_init = a52_init;
    s->a52_samples = a52_samples;
    s->a52_syncinfo = a52_syncinfo;
    s->a52_frame = a52_frame;
    s->a52_block = a52_block;
    s->a52_free = a52_free;
#endif
    s->state = s->a52_init(0); /* later use CPU flags */
    s->samples = s->a52_samples(s->state);
    s->inbuf_ptr = s->inbuf;
    s->frame_size = 0;

    return 0;
}