av_cold int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, int flip, int has_alpha) { int i; s->avctx = avctx; avctx->pix_fmt = has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P; if (avctx->skip_alpha) avctx->pix_fmt = AV_PIX_FMT_YUV420P; ff_h264chroma_init(&s->h264chroma, 8); ff_hpeldsp_init(&s->hdsp, avctx->flags); ff_videodsp_init(&s->vdsp, 8); ff_vp3dsp_init(&s->vp3dsp, avctx->flags); ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id); for (i = 0; i < 64; i++) { #define TRANSPOSE(x) (x >> 3) | ((x & 7) << 3) s->idct_scantable[i] = TRANSPOSE(ff_zigzag_direct[i]); #undef TRANSPOSE } for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++) { s->frames[i] = av_frame_alloc(); if (!s->frames[i]) { ff_vp56_free(avctx); return AVERROR(ENOMEM); } } s->edge_emu_buffer_alloc = NULL; s->above_blocks = NULL; s->macroblocks = NULL; s->quantizer = -1; s->deblock_filtering = 1; s->golden_frame = 0; s->filter = NULL; s->has_alpha = has_alpha; s->modelp = &s->model; if (flip) { s->flip = -1; s->frbi = 2; s->srbi = 0; } else { s->flip = 1; s->frbi = 0; s->srbi = 2; } return 0; }