int ff_h264_decode_sei(H264Context *h) { while (get_bits_left(&h->gb) > 16) { int size = 0; int type = 0; int ret = 0; int last = 0; while (get_bits_left(&h->gb) >= 8 && (last = get_bits(&h->gb, 8)) == 255) { type += 255; } type += last; last = 0; while (get_bits_left(&h->gb) >= 8 && (last = get_bits(&h->gb, 8)) == 255) { size += 255; } size += last; if (size > get_bits_left(&h->gb) / 8) { av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n", type, get_bits_left(&h->gb)); return AVERROR_INVALIDDATA; } switch (type) { case SEI_TYPE_PIC_TIMING: // Picture timing SEI ret = decode_picture_timing(h); if (ret < 0) return ret; break; case SEI_TYPE_USER_DATA_UNREGISTERED: ret = decode_unregistered_user_data(h, size); if (ret < 0) return ret; break; case SEI_TYPE_RECOVERY_POINT: ret = decode_recovery_point(h); if (ret < 0) return ret; break; case SEI_TYPE_BUFFERING_PERIOD: ret = decode_buffering_period(h); if (ret < 0) return ret; break; case SEI_TYPE_FRAME_PACKING: ret = decode_frame_packing_arrangement(h); if (ret < 0) return ret; break; case SEI_TYPE_DISPLAY_ORIENTATION: ret = decode_display_orientation(h); if (ret < 0) return ret; break; default: av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type); skip_bits(&h->gb, 8 * size); } // FIXME check bits here align_get_bits(&h->gb); } return 0; }