static 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); s->inbuf_ptr = s->inbuf; s->frame_size = 0; /* 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; }