av_cold int ff_h264_decode_init(AVCodecContext *avctx) { H264Context *h = avctx->priv_data; int i; int ret; h->avctx = avctx; h->bit_depth_luma = 8; h->chroma_format_idc = 1; h->cur_chroma_format_idc = 1; ff_h264dsp_init(&h->h264dsp, 8, 1); av_assert0(h->sps.bit_depth_chroma == 0); ff_h264chroma_init(&h->h264chroma, h->sps.bit_depth_chroma); ff_h264qpel_init(&h->h264qpel, 8); ff_h264_pred_init(&h->hpc, h->avctx->codec_id, 8, 1); h->dequant_coeff_pps = -1; h->current_sps_id = -1; /* needed so that IDCT permutation is known early */ ff_videodsp_init(&h->vdsp, 8); memset(h->pps.scaling_matrix4, 16, 6 * 16 * sizeof(uint8_t)); memset(h->pps.scaling_matrix8, 16, 2 * 64 * sizeof(uint8_t)); h->picture_structure = PICT_FRAME; h->slice_context_count = 1; h->workaround_bugs = avctx->workaround_bugs; h->flags = avctx->flags; /* set defaults */ // s->decode_mb = ff_h263_decode_mb; if (!avctx->has_b_frames) h->low_delay = 1; avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; ff_h264_decode_init_vlc(); ff_init_cabac_states(); h->pixel_shift = 0; h->cur_bit_depth_luma = h->sps.bit_depth_luma = avctx->bits_per_raw_sample = 8; h->nb_slice_ctx = (avctx->active_thread_type & FF_THREAD_SLICE) ? H264_MAX_THREADS : 1; h->slice_ctx = av_mallocz_array(h->nb_slice_ctx, sizeof(*h->slice_ctx)); if (!h->slice_ctx) { h->nb_slice_ctx = 0; return AVERROR(ENOMEM); } for (i = 0; i < h->nb_slice_ctx; i++) h->slice_ctx[i].h264 = h; h->outputed_poc = h->next_outputed_poc = INT_MIN; for (i = 0; i < MAX_DELAYED_PIC_COUNT; i++) h->last_pocs[i] = INT_MIN; h->prev_poc_msb = 1 << 16; h->prev_frame_num = -1; h->x264_build = -1; h->sei_fpa.frame_packing_arrangement_cancel_flag = -1; ff_h264_reset_sei(h); if (avctx->codec_id == AV_CODEC_ID_H264) { if (avctx->ticks_per_frame == 1) { if(h->avctx->time_base.den < INT_MAX/2) { h->avctx->time_base.den *= 2; } else h->avctx->time_base.num /= 2; } avctx->ticks_per_frame = 2; } if (avctx->extradata_size > 0 && avctx->extradata) { ret = ff_h264_decode_extradata(h, avctx->extradata, avctx->extradata_size); if (ret < 0) { ff_h264_free_context(h); return ret; } } if (h->sps.bitstream_restriction_flag && h->avctx->has_b_frames < h->sps.num_reorder_frames) { h->avctx->has_b_frames = h->sps.num_reorder_frames; h->low_delay = 0; } avctx->internal->allocate_progress = 1; ff_h264_flush_change(h); if (h->enable_er) { av_log(avctx, AV_LOG_WARNING, "Error resilience is enabled. It is unsafe and unsupported and may crash. " "Use it at your own risk\n"); } return 0; }